diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..047604a
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,7 @@
+BasedOnStyle: LLVM
+UseTab: Always
+TabWidth: 4
+IndentWidth: 4
+ColumnLimit: 100
+AllowShortIfStatementsOnASingleLine: true
+AllowShortLoopsOnASingleLine: true
diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 0000000..92c3c8e
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,12 @@
+Checks: >
+  clang-diagnostic-*,
+  clang-analyzer-*,
+  bugprone-*,
+  -bugprone-easily-swappable-parameters,
+  performance-*,
+  readability-*,
+  -readability-magic-numbers,
+  -readability-function-cognitive-complexity,
+  -readability-identifier-length,
+  -readability-braces-around-statements
+HeaderFilterRegex: '^(src|include)/.*'
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..a705607
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,36 @@
+name: C CI
+
+on:
+  push:
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y build-essential clang libcmocka-dev
+        sudo apt-get install -y build-essential clang clang-format clang-tidy libcmocka-dev bear
+
+    - name: Build
+      run: make CC=gcc
+
+    - name: Run tests
+      run: make test
+
+    - name: Check code formatting
+      run: |
+        find src/ -name '*.c' -o -name '*.h' | xargs clang-format --dry-run -Werror
+
+    - name: Generate compile_commands.json
+      run: bear -- make
+
+    - name: Static analysis
+      run: |
+        find src/ -name '*.c' | xargs clang-tidy --quiet
diff --git a/Makefile b/Makefile
index e69de29..c21ba06 100644
--- a/Makefile
+++ b/Makefile
@@ -0,0 +1,86 @@
+CC = gcc
+CFLAGS = -std=c11 -Wall -Wextra -O2 -D_POSIX_C_SOURCE=200809L \
+         -Iinclude -Ithird_party/stb -fopenmp -pthread
+CFLAGS_FAST = $(CFLAGS) -O3 -march=native
+CFLAGS_TEST = -std=c11 -Wall -Wextra -O0 -g -D_POSIX_C_SOURCE=200809L \
+              -Iinclude -Ithird_party/stb -fopenmp -pthread
+LDFLAGS = -lm -fopenmp -pthread
+TARGET = conv
+
+VPATH = src src/lib benchmarks
+
+SRCS = main.c conv.c cli.c filters.c imgio.c pipeline.c queue.c
+OBJS = $(SRCS:.c=.o)
+
+BENCH_DIR = benchmarks
+BENCH_BIN = conv_bench
+
+LIB_OBJS = conv.o cli.o filters.o imgio.o pipeline.o queue.o
+TEST_SRC  = tests/test_conv.c
+TEST_BIN  = test_runner
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+bench_conv.o: src/lib/conv.c
+	$(CC) $(CFLAGS_FAST) -c $< -o $@
+
+bench_filters.o: src/lib/filters.c
+	$(CC) $(CFLAGS_FAST) -c $< -o $@
+
+bench_imgio.o: src/lib/imgio.c
+	$(CC) $(CFLAGS_FAST) -c $< -o $@
+
+bench_pipeline.o: src/lib/pipeline.c
+	$(CC) $(CFLAGS_FAST) -c $< -o $@
+
+bench_queue.o: src/lib/queue.c
+	$(CC) $(CFLAGS_FAST) -c $< -o $@
+
+$(BENCH_DIR)/bench_main.o: $(BENCH_DIR)/bench_main.c
+	$(CC) $(CFLAGS_FAST) -c $< -o $@
+
+$(BENCH_DIR)/benchmark.o: $(BENCH_DIR)/benchmark.c
+	$(CC) $(CFLAGS_FAST) -c $< -o $@
+
+$(BENCH_BIN): $(BENCH_DIR)/bench_main.o $(BENCH_DIR)/benchmark.o \
+              bench_conv.o bench_filters.o \
+              bench_imgio.o bench_pipeline.o bench_queue.o
+	$(CC) $(CFLAGS_FAST) $^ -o $@ $(LDFLAGS)
+
+bench: $(BENCH_BIN)
+	mkdir -p results
+	./$(BENCH_BIN) conv > results/bench.csv
+	@echo "Done: results/bench.csv"
+
+bench_pipeline: $(BENCH_BIN)
+	mkdir -p results
+	./$(BENCH_BIN) pipeline > results/bench_pipeline.csv
+	@echo "Done: results/bench_pipeline.csv"
+
+bench_all: bench bench_pipeline
+	python3 $(BENCH_DIR)/plot.py results/bench.csv results/bench_pipeline.csv
+	@echo "Plots saved to results/"
+
+test: $(TEST_BIN)
+	./$(TEST_BIN)
+
+$(TEST_BIN): $(LIB_OBJS) $(TEST_SRC)
+	$(CC) $(CFLAGS_TEST) $^ -o $@ -lm -lcmocka
+
+results:
+	mkdir -p results
+
+clean:
+	rm -f $(TARGET) $(BENCH_BIN) $(OBJS) \
+	      $(BENCH_DIR)/bench_main.o $(BENCH_DIR)/benchmark.o \
+	      bench_conv.o bench_filters.o bench_imgio.o \
+	      bench_pipeline.o bench_queue.o $(TEST_BIN)
+	rm -rf results *.o
+
+.PHONY: all test bench bench_pipeline bench_all clean results
diff --git a/README.md b/README.md
index e69de29..2b8e8b7 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,72 @@
+# Image Convolution
+
+Simple CLI tool for applying convolution filters to images.  
+Supports single-image processing and a dynamic pipeline for batch processing.
+
+## Build & Run
+
+```bash
+make                  # build
+make test             # run unit tests
+make bench            # benchmarks for parallel convolution → results/bench.csv
+make bench_pipeline   # benchmarks for pipeline convolution → results/bench_pipeline.csv
+make bench_all        # run all benchmarks & auto-generate plots
+```
+
+## Usage
+
+**Single image:**
+
+```bash
+./conv <input> <output> --filter <name> [--strategy <name>]
+```
+
+**Pipeline mode (batch):**
+
+```bash
+./conv --pipeline --filter <name> --workers <N> <in1> <out1> [<in2> <out2> ...]
+```
+
+**Filters:** `identity`, `blur`, `gaussian`, `sharpen`, `edges`, `emboss`  
+(add suffix `5/7/9` for larger kernels, e.g. `gaussian9`)
+
+**Strategies:** `sequential`, `rows`, `cols`, `pixels`, `tiles`
+
+**Formats:** BMP, PNG, JPEG
+
+## Pipeline Mode
+
+Processes multiple images concurrently using a 3-stage architecture:  
+`Reader → [bounded queue] → Convolver → [bounded queue] → Writer`
+
+Key features:
+
+- **Dynamic load balancing:** A dispatcher thread periodically checks queue fill levels and reassigns idle workers between `Reader`, `Convolver`, and `Writer` roles.
+- **Backpressure:** Fixed-capacity queues automatically block producers when consumers lag, preventing memory overflow.
+- **Worker count:** Minimum 3 threads required (auto-corrected if lower). Default: `4`.
+- **Inner parallelism:** Each convolver thread uses OpenMP. In benchmarks, inner threads are fixed to `2` to isolate pipeline scaling effects.
+
+## Example
+
+Single image:
+
+```bash
+./conv photo.jpg result.png --filter gaussian7 --strategy rows
+```
+
+Batch processing:
+
+```bash
+./conv --pipeline --filter edges5 --workers 6 \
+    a.png a_out.png b.jpg b_out.jpg c.bmp c_out.bmp
+```
+
+## Testing
+
+Tests verify convolution correctness using property-based checks (identity, composition, padding, boundary wrapping).  
+Additionally, test runs the pipeline on multiple images and **compares every output against the standard sequential mode** to guarantee bitwise identical results regardless of worker count or dynamic role switching.
+
+## Performance Analysis
+
+- **Task 2 (Single Image & Strategies):** See [benchmarks/parallel_conv_bench.md](benchmarks/parallel_conv_bench.md) for thread scaling and strategy comparison.
+- **Task 3 (Pipeline & Batch Processing):** See [benchmarks/pipeline_conv_bench.md](benchmarks/pipeline_conv_bench.md) for worker scaling, batch size analysis, and dynamic balancing results.
diff --git a/benchmarks/bench_main.c b/benchmarks/bench_main.c
new file mode 100644
index 0000000..0cb7707
--- /dev/null
+++ b/benchmarks/bench_main.c
@@ -0,0 +1,120 @@
+#include "benchmark.h"
+#include "filters.h"
+#include <math.h>
+#include <omp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void run_conv_bench(void) {
+	const size_t IMG_SIZE = 512;
+	const char *FILTER_NAME = "gaussian5";
+	const char *strat_names[] = {"sequential", "per_pixel", "by_rows", "by_cols", "tiles"};
+	const ParallelStrategy strats[] = {STRATEGY_SEQUENTIAL, STRATEGY_PER_PIXEL, STRATEGY_BY_ROWS,
+									   STRATEGY_BY_COLS, STRATEGY_TILES};
+	const int threads[] = {1, 2, 4, 8};
+
+	fprintf(stderr, "bench conv: %zux%zu  filter=%s\n", IMG_SIZE, IMG_SIZE, FILTER_NAME);
+
+	struct Filter f = {0};
+	for (size_t k = 0; k < filter_count; ++k) {
+		if (strcmp(filter_list[k].name, FILTER_NAME) == 0) {
+			f = filter_list[k].create();
+			break;
+		}
+	}
+
+	Image *src = create_synthetic_image(IMG_SIZE, IMG_SIZE, 3);
+	Image *dst = create_synthetic_image(IMG_SIZE, IMG_SIZE, 3);
+	if (!src || !dst) {
+		fprintf(stderr, "Out of memory\n");
+		free_image(src);
+		free_image(dst);
+		return;
+	}
+
+	bench_print_header();
+
+	BenchStats baseline = bench_run_conv(src, dst, &f, STRATEGY_SEQUENTIAL, 50);
+	bench_print_csv("sequential", 1, IMG_SIZE, IMG_SIZE, FILTER_NAME, &baseline, 0.0);
+
+	for (size_t st = 1; st < 5; ++st) {
+		for (size_t ti = 0; ti < 4; ++ti) {
+			int t = threads[ti];
+			omp_set_num_threads(t);
+			BenchStats stats = bench_run_conv(src, dst, &f, strats[st], 50);
+			bench_print_csv(strat_names[st], t, IMG_SIZE, IMG_SIZE, FILTER_NAME, &stats,
+							baseline.mean);
+		}
+	}
+
+	free_image(src);
+	free_image(dst);
+	fprintf(stderr, "bench conv: Done\n");
+}
+
+static void run_pipeline_bench(void) {
+	const size_t n_images_list[] = {10, 20};
+	const size_t IMG_W = 512;
+	const size_t IMG_H = 512;
+	const char *FILTER_NAME = "gaussian5";
+	const size_t n_workers_list[] = {3, 4, 6, 10};
+	const char *strat_names[] = {"sequential", "per_pixel", "by_rows", "by_cols", "tiles"};
+	const ParallelStrategy strats[] = {STRATEGY_SEQUENTIAL, STRATEGY_PER_PIXEL, STRATEGY_BY_ROWS,
+									   STRATEGY_BY_COLS, STRATEGY_TILES};
+	const size_t N_STRATS = sizeof(strats) / sizeof(strats[0]);
+	const size_t N_WORKERS = sizeof(n_workers_list) / sizeof(n_workers_list[0]);
+	const size_t N_BATCHES = sizeof(n_images_list) / sizeof(n_images_list[0]);
+	const int REPEAT = 10;
+	const int FIXED_INNER_THREADS = 2;
+
+	omp_set_num_threads(FIXED_INNER_THREADS);
+
+	struct Filter f = {0};
+	for (size_t k = 0; k < filter_count; ++k) {
+		if (strcmp(filter_list[k].name, FILTER_NAME) == 0) {
+			f = filter_list[k].create();
+			break;
+		}
+	}
+
+	bench_print_pipeline_header();
+
+	for (size_t ni = 0; ni < N_BATCHES; ni++) {
+		size_t n_images = n_images_list[ni];
+		fprintf(stderr, "bench pipeline: n_images=%zu  %zux%zu  filter=%s  inner_threads=%d\n",
+				n_images, IMG_W, IMG_H, FILTER_NAME, FIXED_INNER_THREADS);
+
+		BenchStats baseline = bench_run_pipeline(n_images, IMG_W, IMG_H, &f, STRATEGY_SEQUENTIAL, 1,
+												 "sequential", REPEAT);
+		bench_print_pipeline_csv("sequential", 1, n_images, IMG_W, IMG_H, FILTER_NAME, "sequential",
+								 &baseline, 0.0);
+
+		for (size_t wi = 0; wi < N_WORKERS; wi++) {
+			size_t nw = n_workers_list[wi];
+			for (size_t si = 0; si < N_STRATS; si++) {
+				BenchStats stats = bench_run_pipeline(n_images, IMG_W, IMG_H, &f, strats[si], nw,
+													  "pipeline", REPEAT);
+				bench_print_pipeline_csv("pipeline", nw, n_images, IMG_W, IMG_H, FILTER_NAME,
+										 strat_names[si], &stats, baseline.mean);
+			}
+		}
+	}
+
+	fprintf(stderr, "bench pipeline: Done\n");
+	omp_set_num_threads(omp_get_max_threads());
+}
+
+int main(int argc, char *argv[]) {
+	int do_conv = 1;
+	int do_pipeline = 1;
+	if (argc == 2) {
+		do_conv = (strcmp(argv[1], "conv") == 0);
+		do_pipeline = (strcmp(argv[1], "pipeline") == 0);
+	}
+
+	if (do_conv) run_conv_bench();
+	if (do_pipeline) run_pipeline_bench();
+
+	return 0;
+}
diff --git a/benchmarks/benchmark.c b/benchmarks/benchmark.c
new file mode 100644
index 0000000..0bde712
--- /dev/null
+++ b/benchmarks/benchmark.c
@@ -0,0 +1,195 @@
+#include "benchmark.h"
+#include "imgio.h"
+#include "pipeline.h"
+#include <math.h>
+#include <omp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_IMAGES 64
+#define TMP_PATH_LEN 128
+
+Image *create_synthetic_image(size_t w, size_t h, int ch) {
+	Image *img = malloc(sizeof(Image));
+	if (!img) return NULL;
+	img->width = w;
+	img->height = h;
+	img->channels = ch;
+	size_t total = w * h * (size_t)ch;
+	img->pixels = malloc(total);
+	if (!img->pixels) {
+		free(img);
+		return NULL;
+	}
+	for (size_t i = 0; i < total; ++i) img->pixels[i] = (uint8_t)((i * 17 + (i / w) * 31) % 256);
+	return img;
+}
+
+void free_image(Image *img) {
+	if (img) {
+		free(img->pixels);
+		free(img);
+	}
+}
+
+double bench_now(void) { return omp_get_wtime(); }
+
+static double calc_mean(const double *arr, size_t n) {
+	if (n == 0) return 0.0;
+	double sum = 0.0;
+	for (size_t i = 0; i < n; i++) sum += arr[i];
+	return sum / (double)n;
+}
+
+static double calc_stddev(const double *arr, size_t n, double mean) {
+	if (n <= 1) return 0.0;
+	double variance = 0.0;
+	for (size_t i = 0; i < n; i++) {
+		double diff = arr[i] - mean;
+		variance += diff * diff;
+	}
+	return sqrt(variance / (double)n);
+}
+
+static void calc_stats(BenchStats *s) {
+	s->mean = calc_mean(s->times, s->count);
+	s->stddev = calc_stddev(s->times, s->count, s->mean);
+	s->min = s->times[0];
+	s->max = s->times[0];
+	for (size_t i = 1; i < s->count; i++) {
+		if (s->times[i] < s->min) s->min = s->times[i];
+		if (s->times[i] > s->max) s->max = s->times[i];
+	}
+}
+
+BenchStats bench_run_conv(const Image *input, Image *output, const struct Filter *filter,
+						  ParallelStrategy strategy, int repeat) {
+	BenchStats stats = {0};
+	stats.count = ((size_t)repeat < BENCH_MAX_RUNS) ? (size_t)repeat : BENCH_MAX_RUNS;
+
+	for (int w = 0; w < BENCH_WARMUP; w++) convolve_parallel(input, output, filter, strategy);
+
+	for (size_t i = 0; i < stats.count; i++) {
+		double t0 = bench_now();
+		convolve_parallel(input, output, filter, strategy);
+		stats.times[i] = (bench_now() - t0) * 1000.0;
+	}
+	calc_stats(&stats);
+	return stats;
+}
+
+void bench_print_header(void) {
+	printf("strategy,threads,width,height,filter,mean_ms,min_ms,max_ms,stddev_ms,speedup\n");
+	fflush(stdout);
+}
+
+void bench_print_csv(const char *strategy, int threads, size_t width, size_t height,
+					 const char *filter_name, const BenchStats *stats, double baseline_ms) {
+	double speedup = (baseline_ms > 0.0) ? (baseline_ms / stats->mean) : 1.0;
+	printf("%s,%d,%zu,%zu,%s,%.3f,%.3f,%.3f,%.3f,%.2f\n", strategy, threads, width, height,
+		   filter_name, stats->mean, stats->min, stats->max, stats->stddev, speedup);
+	fflush(stdout);
+}
+
+static int prepare_tmp_files(size_t n, size_t w, size_t h, char in_paths[][TMP_PATH_LEN],
+							 char out_paths[][TMP_PATH_LEN]) {
+	for (size_t i = 0; i < n; i++) {
+		snprintf(in_paths[i], TMP_PATH_LEN, "/tmp/bench_pipe_in_%zu.bmp", i);
+		snprintf(out_paths[i], TMP_PATH_LEN, "/tmp/bench_pipe_out_%zu.bmp", i);
+		Image *img = create_synthetic_image(w, h, 3);
+		if (!img) return 0;
+		int ok = imgio_save(in_paths[i], img);
+		free_image(img);
+		if (!ok) {
+			fprintf(stderr, "bench: failed to write '%s'\n", in_paths[i]);
+			return 0;
+		}
+	}
+	return 1;
+}
+
+static void cleanup_tmp_files(size_t n, char in_paths[][TMP_PATH_LEN],
+							  char out_paths[][TMP_PATH_LEN]) {
+	for (size_t i = 0; i < n; i++) {
+		remove(in_paths[i]);
+		remove(out_paths[i]);
+	}
+}
+
+static double run_sequential_batch(char in_paths[][TMP_PATH_LEN], char out_paths[][TMP_PATH_LEN],
+								   size_t n, const struct Filter *filter) {
+	double t0 = omp_get_wtime();
+	for (size_t i = 0; i < n; i++) {
+		Image src;
+		if (!imgio_load(in_paths[i], &src)) continue;
+		Image dst = {
+			.pixels = malloc(src.width * src.height * (size_t)src.channels),
+			.width = src.width,
+			.height = src.height,
+			.channels = src.channels,
+		};
+		convolve_sequential(&src, &dst, filter);
+		imgio_save(out_paths[i], &dst);
+		free(dst.pixels);
+		imgio_free(&src);
+	}
+	return (omp_get_wtime() - t0) * 1000.0;
+}
+
+static double run_pipeline_batch(char in_paths[][TMP_PATH_LEN], char out_paths[][TMP_PATH_LEN],
+								 size_t n, const struct Filter *filter, ParallelStrategy strategy,
+								 size_t n_workers) {
+	char *ins[MAX_IMAGES];
+	char *outs[MAX_IMAGES];
+	for (size_t i = 0; i < n; i++) {
+		ins[i] = in_paths[i];
+		outs[i] = out_paths[i];
+	}
+	double t0 = omp_get_wtime();
+	pipeline_run(ins, outs, n, filter, strategy, n_workers);
+	return (omp_get_wtime() - t0) * 1000.0;
+}
+
+BenchStats bench_run_pipeline(size_t n_images, size_t img_w, size_t img_h,
+							  const struct Filter *filter, ParallelStrategy conv_strategy,
+							  size_t n_workers, const char *mode, int repeat) {
+	BenchStats stats = {0};
+	if (n_images > MAX_IMAGES) n_images = MAX_IMAGES;
+	stats.count = ((size_t)repeat < BENCH_MAX_RUNS) ? (size_t)repeat : BENCH_MAX_RUNS;
+
+	static char in_paths[MAX_IMAGES][TMP_PATH_LEN];
+	static char out_paths[MAX_IMAGES][TMP_PATH_LEN];
+
+	if (!prepare_tmp_files(n_images, img_w, img_h, in_paths, out_paths)) {
+		fprintf(stderr, "bench: failed to prepare tmp files\n");
+		return stats;
+	}
+
+	int is_pipeline = (strcmp(mode, "pipeline") == 0);
+	for (size_t i = 0; i < stats.count; i++) {
+		stats.times[i] = is_pipeline ? run_pipeline_batch(in_paths, out_paths, n_images, filter,
+														  conv_strategy, n_workers)
+									 : run_sequential_batch(in_paths, out_paths, n_images, filter);
+	}
+
+	cleanup_tmp_files(n_images, in_paths, out_paths);
+	calc_stats(&stats);
+	return stats;
+}
+
+void bench_print_pipeline_header(void) {
+	printf("mode,n_workers,n_images,width,height,filter,conv_strategy,"
+		   "mean_ms,min_ms,max_ms,stddev_ms,speedup\n");
+	fflush(stdout);
+}
+
+void bench_print_pipeline_csv(const char *mode, size_t n_workers, size_t n_images, size_t img_w,
+							  size_t img_h, const char *filter_name, const char *conv_strategy,
+							  const BenchStats *stats, double baseline_ms) {
+	double speedup = (baseline_ms > 0.0) ? baseline_ms / stats->mean : 1.0;
+	printf("%s,%zu,%zu,%zu,%zu,%s,%s,%.3f,%.3f,%.3f,%.3f,%.2f\n", mode, n_workers, n_images, img_w,
+		   img_h, filter_name, conv_strategy, stats->mean, stats->min, stats->max, stats->stddev,
+		   speedup);
+	fflush(stdout);
+}
diff --git a/benchmarks/benchmark.h b/benchmarks/benchmark.h
new file mode 100644
index 0000000..ada745a
--- /dev/null
+++ b/benchmarks/benchmark.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include "conv.h"
+#include <stddef.h>
+
+#define BENCH_WARMUP 5
+#define BENCH_MAX_RUNS 50
+
+typedef struct {
+	double times[BENCH_MAX_RUNS]; // Individual run times in milliseconds
+	size_t count;				  // Actual number of runs performed
+	double mean;				  // Average time (ms)
+	double min;					  // Minimum time (ms)
+	double max;					  // Maximum time (ms)
+	double stddev;				  // Standard deviation (ms)
+} BenchStats;
+
+double bench_now(void);
+
+Image *create_synthetic_image(size_t w, size_t h, int ch);
+void free_image(Image *img);
+
+BenchStats bench_run_conv(const Image *input, Image *output, const struct Filter *filter,
+						  ParallelStrategy strategy, int repeat);
+
+void bench_print_header(void);
+
+void bench_print_csv(const char *strategy, int threads, size_t width, size_t height,
+					 const char *filter_name, const BenchStats *stats, double baseline_ms);
+
+BenchStats bench_run_pipeline(size_t n_images, size_t img_w, size_t img_h,
+							  const struct Filter *filter, ParallelStrategy conv_strategy,
+							  size_t n_workers, const char *mode, int repeat);
+
+void bench_print_pipeline_header(void);
+
+void bench_print_pipeline_csv(const char *mode, size_t n_workers, size_t n_images, size_t img_w,
+							  size_t img_h, const char *filter_name, const char *conv_strategy,
+							  const BenchStats *stats, double baseline_ms);
diff --git a/benchmarks/parallel_conv_bench.md b/benchmarks/parallel_conv_bench.md
new file mode 100644
index 0000000..3d9a258
--- /dev/null
+++ b/benchmarks/parallel_conv_bench.md
@@ -0,0 +1,151 @@
+# Анализ производительности параллельной свёртки
+
+Проведён анализ производительности параллельных реализаций
+двумерной свёртки изображений. Измерялось время применения свёртки при разных стратегиях распараллеливания и разном числе потоков.
+
+## Методика измерений
+
+**Тестовые изображения** – 2 сгенерированных 3-канальных изображения 512×512 и 1024×1024 пикселей
+
+- **Фильтр** – `gaussian5` (5×5, factor=1/256, bias=0).
+- **Прогрев** – 5 холостых вызовов свёртки для каждого измерения, чтобы стабилизировать кэш и пул потоков OpenMP.
+- **Количество измеряемых прогонов** – 50 (для каждой комбинации стратегии и числа потоков).
+- **Таймер** – `omp_get_wtime()`
+- **Метрики** – для каждого прогона сохранялось время в миллисекундах, затем вычислялись: среднее арифметическое, минимум, максимум, стандартное отклонение, а также ускорение (speedup) относительно последовательной версии.
+- **Число потоков** – задавалось через `omp_set_num_threads()`; тестировались 1, 2, 4 и 8 потоков.
+
+## Конфигурация тестовой системы
+
+Все замеры производительности выполнены на следующей аппаратно-программной платформе:
+
+| Параметр                 | Значение                                          |
+| ------------------------ | ------------------------------------------------- |
+| **Процессор**            | Intel(R) Celeron(R) N5095A @ 2.00GHz              |
+| **Архитектура**          | x86_64, Jasper Lake (10nm)                        |
+| **Ядра**                 | 4 физических ядра (1 поток на ядро)               |
+| **Кэш L1d**              | 128 KiB (4×32 KiB)                                |
+| **Кэш L1i**              | 128 KiB (4×32 KiB)                                |
+| **Кэш L2**               | 1.5 MiB                                           |
+| **Кэш L3**               | 4 MiB                                             |
+| **NUMA**                 | 1 узел                                            |
+| **Оперативная память**   | 15 ГиБ                                            |
+| **Операционная система** | Ubuntu 24.04.3 LTS                                |
+| **Компилятор**           | GCC 13.3.0                                        |
+| **Флаги компиляции**     | `-std=c11 -Wall -Wextra -O3 -fopenmp` (бенчмарка) |
+
+## Результаты
+
+### Изображение 512×512 запуск 1
+
+| Стратегия  | Потоки | Mean (мс) | Min (мс) | Max (мс) | StdDev (мс) | Speedup |
+| ---------- | ------ | --------- | -------- | -------- | ----------- | ------- |
+| sequential | 1      | 394.877   | 393.201  | 415.805  | 3.291       | 1.00×   |
+| per_pixel  | 1      | 404.817   | 402.709  | 421.737  | 2.693       | 0.98×   |
+| per_pixel  | 2      | 216.767   | 203.375  | 305.470  | 19.510      | 1.82×   |
+| per_pixel  | 4      | 267.428   | 186.651  | 414.969  | 64.210      | 1.48×   |
+| per_pixel  | 8      | 187.870   | 140.583  | 242.681  | 27.423      | 2.10×   |
+| by_rows    | 1      | 400.066   | 399.369  | 402.782  | 0.567       | 0.99×   |
+| by_rows    | 2      | 200.357   | 199.674  | 206.340  | 0.947       | 1.97×   |
+| by_rows    | 4      | 242.183   | 190.044  | 275.931  | 24.299      | 1.63×   |
+| by_rows    | 8      | 156.517   | 141.894  | 177.730  | 8.408       | 2.52×   |
+| by_cols    | 1      | 400.708   | 399.654  | 403.005  | 0.817       | 0.99×   |
+| by_cols    | 2      | 200.553   | 199.668  | 209.442  | 1.437       | 1.97×   |
+| by_cols    | 4      | 219.569   | 184.152  | 266.234  | 29.584      | 1.80×   |
+| by_cols    | 8      | 166.910   | 140.044  | 267.140  | 23.838      | 2.37×   |
+| tiles      | 1      | 400.716   | 399.054  | 405.016  | 1.394       | 0.99×   |
+| tiles      | 2      | 201.223   | 199.922  | 215.190  | 2.815       | 1.96×   |
+| tiles      | 4      | 234.076   | 185.226  | 319.881  | 29.856      | 1.69×   |
+| tiles      | 8      | 163.673   | 140.482  | 247.685  | 20.275      | 2.41×   |
+
+### Изображение 512×512 запуск 2
+
+| Стратегия  | Потоки | Mean (мс) | Min (мс) | Max (мс) | StdDev (мс) | Speedup |
+| ---------- | ------ | --------- | -------- | -------- | ----------- | ------- |
+| sequential | 1      | 396.685   | 392.295  | 491.766  | 14.699      | 1.00×   |
+| per_pixel  | 1      | 407.701   | 401.142  | 546.467  | 26.603      | 0.97×   |
+| per_pixel  | 2      | 235.941   | 200.885  | 562.304  | 67.582      | 1.68×   |
+| per_pixel  | 4      | 260.416   | 187.290  | 522.834  | 57.915      | 1.52×   |
+| per_pixel  | 8      | 237.420   | 152.667  | 410.943  | 57.331      | 1.67×   |
+| by_rows    | 1      | 408.769   | 398.782  | 835.993  | 61.085      | 0.97×   |
+| by_rows    | 2      | 224.683   | 199.346  | 871.216  | 100.947     | 1.77×   |
+| by_rows    | 4      | 251.944   | 185.681  | 406.967  | 41.157      | 1.57×   |
+| by_rows    | 8      | 198.327   | 144.418  | 367.375  | 40.965      | 2.00×   |
+| by_cols    | 1      | 410.676   | 399.556  | 750.760  | 51.924      | 0.97×   |
+| by_cols    | 2      | 212.351   | 199.784  | 387.411  | 31.226      | 1.87×   |
+| by_cols    | 4      | 277.652   | 184.641  | 433.786  | 72.877      | 1.43×   |
+| by_cols    | 8      | 200.871   | 141.111  | 356.383  | 45.981      | 1.97×   |
+| tiles      | 1      | 401.210   | 400.139  | 413.963  | 1.926       | 0.99×   |
+| tiles      | 2      | 216.975   | 199.949  | 519.042  | 54.387      | 1.83×   |
+| tiles      | 4      | 277.132   | 187.353  | 489.164  | 50.669      | 1.43×   |
+| tiles      | 8      | 191.309   | 140.358  | 328.814  | 42.359      | 2.07×   |
+
+### Изображение 1024×1024
+
+| Стратегия  | Потоки | Mean (мс) | Min (мс) | Max (мс) | StdDev (мс) | Speedup |
+| ---------- | ------ | --------- | -------- | -------- | ----------- | ------- |
+| sequential | 1      | 1580.865  | 1573.878 | 1743.640 | 23.432      | 1.00×   |
+| per_pixel  | 1      | 1617.078  | 1609.452 | 1632.257 | 4.178       | 0.98×   |
+| per_pixel  | 2      | 832.426   | 806.513  | 1314.812 | 86.645      | 1.90×   |
+| per_pixel  | 4      | 785.752   | 628.071  | 1439.441 | 152.227     | 2.01×   |
+| per_pixel  | 8      | 639.336   | 534.342  | 1106.961 | 105.842     | 2.47×   |
+| by_rows    | 1      | 1601.459  | 1598.370 | 1607.782 | 1.707       | 0.99×   |
+| by_rows    | 2      | 836.852   | 799.117  | 1298.846 | 101.671     | 1.89×   |
+| by_rows    | 4      | 831.702   | 628.030  | 1560.148 | 165.335     | 1.90×   |
+| by_rows    | 8      | 581.172   | 533.927  | 674.505  | 36.856      | 2.72×   |
+| by_cols    | 1      | 1615.292  | 1607.833 | 1630.588 | 5.699       | 0.98×   |
+| by_cols    | 2      | 812.461   | 808.365  | 821.976  | 3.073       | 1.95×   |
+| by_cols    | 4      | 754.739   | 631.750  | 853.555  | 68.012      | 2.09×   |
+| by_cols    | 8      | 601.183   | 552.373  | 722.492  | 42.842      | 2.63×   |
+| tiles      | 1      | 1604.246  | 1602.227 | 1608.627 | 1.414       | 0.99×   |
+| tiles      | 2      | 803.133   | 800.838  | 817.890  | 3.004       | 1.97×   |
+| tiles      | 4      | 756.144   | 620.790  | 838.037  | 57.856      | 2.09×   |
+| tiles      | 8      | 574.597   | 533.354  | 756.702  | 38.014      | 2.75×   |
+
+### Изображение 512×512 время выполнения запуска 1
+
+![время 512 1](results/time_plot_512_1.png)
+
+### Изображение 512×512 время выполнения запуска 2
+
+![время 512 2](results/time_plot_512_2.png)
+
+### Изображение 1024×1024 время выполнения
+
+![время 1024](results/time_plot_1024.png)
+
+### Изображение 512×512 ускорение запуска 1
+
+![ускорение 512 1](results/speedup_plot_512_1.png)
+
+### Изображение 512×512 ускорение запуска 2
+
+![ускорение 512 2](results/speedup_plot_512_2.png)
+
+### Изображение 1024×1024 ускорение
+
+![ускорение 1024](results/speedup_plot_1024.png)
+
+## Анализ результатов
+
+### Масштабируемость
+
+- При одном потоке любая параллельная стратегия работает на 1–3% медленнее последовательной из‑за накладных расходов на создание команды потоков и синхронизацию.
+- Переход на 2 потока даёт практически двукратное ускорение (до 1.97×), что подтверждает хорошую независимость вычислений.
+- При 4 потоках на изображениях 512×512 наблюдается снижение производительности (stddev растёт, среднее время выше, чем на 2 потоках)
+  **Возможные причины**:
+  - **Конкуренция за кэш**: 4 ядра делят общий L2 (1.5 MiB) и L3 (4 MiB),
+    что увеличивает промахи при работе с изображением 512×512×3 ≈ 768 КБ.
+  - **Планировщик ОС**: на пользовательской системе фоновые процессы могут
+    «перехватывать» ядра, увеличивая дисперсию.
+  - **Накладные расходы OpenMP**: при малом объёме работы на поток (512×512 / 4)
+    синхронизация начинает доминировать над вычислениями.
+- Для 1024×1024 масштабирование лучше: 8 потоков дают ускорение до 2.75× (tiles).
+
+### Сравнение стратегий
+
+-**by_rows** и **by_cols** дают схожие результаты на 512×512. На 1024×1024
+при 4 потоках by_cols неожиданно быстрее by_rows (754 vs 831 ms) —
+вероятно, особенность планировщика OMP на данном CPU при этом размере задачи.
+
+- **tiles** стабильно лучшая стратегия на 8 потоках: блочное разбиение улучшает локальность, уменьшает промахи кэша и обеспечивает равномерную загрузку ядер.
+- **per_pixel** показывает наибольший разброс. Причина — вычисление координат через целочисленное деление (`idx / width`, `idx % width`) на каждый пиксель добавляет накладные расходы, которые заметны при лёгком вычислении на пиксель.
diff --git a/benchmarks/pipeline_conv_bench.md b/benchmarks/pipeline_conv_bench.md
new file mode 100644
index 0000000..4057d81
--- /dev/null
+++ b/benchmarks/pipeline_conv_bench.md
@@ -0,0 +1,113 @@
+## Анализ производительности конвейерной обработки
+
+Проведён анализ производительности конвейера для пакетной обработки изображений. Измерялось общее время обработки наборов из 10 и 20 изображений 512×512 RGB с фильтром `gaussian5`. Внутренняя свёртка внутри каждого worker выполнялась с фиксированным числом потоков OpenMP (2), чтобы изменения производительности были обусловлены только числом worker'ов конвейера, а не внутренним параллелизмом свёртки.
+
+### Методика измерений
+
+- **Изображения** – синтетические 512×512 RGB, создаются и сохраняются во временные BMP-файлы перед каждым прогоном.
+- **Фильтр** – `gaussian5` (5×5, factor=1/256).
+- **Число worker'ов конвейера** – общее количество потоков: 3, 4, 6, 10. При этом вычислителей получается 1, 2, 4, 8 (1 reader and 1 writer фиксированы в начальной конфигурации).
+- **Стратегии свёртки** – `sequential`, `per_pixel`, `by_rows`, `by_cols`, `tiles`.
+- **Повторений** – 10 для каждой комбинации.
+- **Базовая линия (baseline)** – последовательная обработка (один файл за другим, без конвейера) с последовательной свёрткой.
+- **Ускорение (speedup)** – `baseline_mean / pipeline_mean`.
+
+## Конфигурация тестовой системы
+
+Все замеры производительности выполнены на следующей аппаратно-программной платформе:
+
+| Параметр                 | Значение                                          |
+| ------------------------ | ------------------------------------------------- |
+| **Процессор**            | Intel(R) Celeron(R) N5095A @ 2.00GHz              |
+| **Архитектура**          | x86_64, Jasper Lake (10nm)                        |
+| **Ядра**                 | 4 физических ядра (1 поток на ядро)               |
+| **Кэш L1d**              | 128 KiB (4×32 KiB)                                |
+| **Кэш L1i**              | 128 KiB (4×32 KiB)                                |
+| **Кэш L2**               | 1.5 MiB                                           |
+| **Кэш L3**               | 4 MiB                                             |
+| **NUMA**                 | 1 узел                                            |
+| **Оперативная память**   | 15 ГиБ                                            |
+| **Операционная система** | Ubuntu 24.04.3 LTS                                |
+| **Компилятор**           | GCC 13.3.0                                        |
+| **Флаги компиляции**     | `-std=c11 -Wall -Wextra -O3 -fopenmp` (бенчмарка) |
+
+### Результаты
+
+#### Набор из 10 изображений
+
+| Режим      | Потоков | Стратегия  | Mean (мс) | Min (мс) | Max (мс) | StdDev (мс) | Speedup |
+| ---------- | ------- | ---------- | --------- | -------- | -------- | ----------- | ------- |
+| sequential | 1       | sequential | 4226.357  | 4126.492 | 4714.443 | 174.909     | 1.00    |
+| pipeline   | 3       | sequential | 4070.554  | 4053.509 | 4206.157 | 45.277      | 1.04    |
+| pipeline   | 3       | per_pixel  | 2845.054  | 2258.771 | 4058.052 | 572.015     | 1.49    |
+| pipeline   | 3       | by_rows    | 2875.240  | 2554.098 | 3770.278 | 416.347     | 1.47    |
+| pipeline   | 3       | by_cols    | 2851.381  | 2257.959 | 3186.540 | 266.954     | 1.48    |
+| pipeline   | 3       | tiles      | 2864.457  | 2408.198 | 3762.457 | 370.425     | 1.48    |
+| pipeline   | 4       | sequential | 2425.470  | 2252.427 | 2859.181 | 226.919     | 1.74    |
+| pipeline   | 4       | per_pixel  | 2202.746  | 1808.078 | 2860.862 | 352.685     | 1.92    |
+| pipeline   | 4       | by_rows    | 2145.505  | 1673.914 | 2564.715 | 274.140     | 1.97    |
+| pipeline   | 4       | by_cols    | 2175.680  | 1804.880 | 2715.972 | 320.290     | 1.94    |
+| pipeline   | 4       | tiles      | 2220.369  | 1810.468 | 2570.568 | 317.828     | 1.90    |
+| pipeline   | 6       | sequential | 2251.464  | 1808.474 | 3311.416 | 455.317     | 1.88    |
+| pipeline   | 6       | per_pixel  | 2058.601  | 1814.348 | 2419.193 | 202.538     | 2.05    |
+| pipeline   | 6       | by_rows    | 2150.947  | 1816.387 | 2421.100 | 162.298     | 1.96    |
+| pipeline   | 6       | by_cols    | 2244.008  | 1958.575 | 2716.814 | 214.120     | 1.88    |
+| pipeline   | 6       | tiles      | 2086.754  | 1664.236 | 2410.100 | 220.140     | 2.03    |
+| pipeline   | 10      | sequential | 2279.668  | 1803.906 | 3187.939 | 432.705     | 1.85    |
+| pipeline   | 10      | per_pixel  | 2139.448  | 1805.321 | 2605.872 | 193.474     | 1.98    |
+| pipeline   | 10      | by_rows    | 1999.067  | 1813.608 | 2275.826 | 143.290     | 2.11    |
+| pipeline   | 10      | by_cols    | 2227.140  | 1961.670 | 2582.405 | 219.185     | 1.90    |
+| pipeline   | 10      | tiles      | 2171.633  | 1968.071 | 2428.895 | 168.261     | 1.95    |
+
+#### Набор из 20 изображений
+
+| Режим      | Потоков | Стратегия  | Mean (мс) | Min (мс) | Max (мс) | StdDev (мс) | Speedup |
+| ---------- | ------- | ---------- | --------- | -------- | -------- | ----------- | ------- |
+| sequential | 1       | sequential | 8290.476  | 8283.055 | 8302.979 | 7.968       | 1.00    |
+| pipeline   | 3       | sequential | 8084.054  | 7955.515 | 8271.230 | 117.569     | 1.03    |
+| pipeline   | 3       | per_pixel  | 5327.910  | 4823.668 | 6171.810 | 417.200     | 1.56    |
+| pipeline   | 3       | by_rows    | 5047.475  | 4514.125 | 6013.429 | 438.776     | 1.64    |
+| pipeline   | 3       | by_cols    | 5073.599  | 4661.345 | 6173.482 | 405.075     | 1.63    |
+| pipeline   | 3       | tiles      | 5372.494  | 4814.824 | 6946.449 | 657.747     | 1.54    |
+| pipeline   | 4       | sequential | 4409.233  | 4208.654 | 5267.112 | 316.613     | 1.88    |
+| pipeline   | 4       | per_pixel  | 3967.494  | 3306.929 | 4972.409 | 538.643     | 2.09    |
+| pipeline   | 4       | by_rows    | 4533.475  | 3309.703 | 7726.489 | 1303.295    | 1.83    |
+| pipeline   | 4       | by_cols    | 3851.807  | 3308.383 | 4825.256 | 594.967     | 2.15    |
+| pipeline   | 4       | tiles      | 3699.037  | 3308.569 | 4076.229 | 228.794     | 2.24    |
+| pipeline   | 6       | sequential | 3747.223  | 3159.414 | 4658.798 | 407.551     | 2.21    |
+| pipeline   | 6       | per_pixel  | 3656.919  | 3175.010 | 4230.186 | 342.155     | 2.27    |
+| pipeline   | 6       | by_rows    | 3688.082  | 3310.597 | 4372.816 | 352.412     | 2.25    |
+| pipeline   | 6       | by_cols    | 3782.056  | 3317.495 | 4387.320 | 335.808     | 2.19    |
+| pipeline   | 6       | tiles      | 3772.634  | 3323.369 | 4403.580 | 385.133     | 2.20    |
+| pipeline   | 10      | sequential | 3887.183  | 3158.710 | 5132.530 | 562.992     | 2.13    |
+| pipeline   | 10      | per_pixel  | 4316.626  | 3186.089 | 7350.846 | 1308.895    | 1.92    |
+| pipeline   | 10      | by_rows    | 3616.142  | 3180.666 | 4243.686 | 351.215     | 2.29    |
+| pipeline   | 10      | by_cols    | 3659.325  | 3335.001 | 4235.902 | 314.329     | 2.27    |
+| pipeline   | 10      | tiles      | 3701.140  | 3177.299 | 4091.702 | 247.418     | 2.24    |
+
+### Графики
+
+- **Время выполнения для 10 изображений**  
+  ![pipeline time 10](results/pipeline_time_10img.png)
+- **Ускорение для 10 изображений**  
+  ![pipeline speedup 10](results/pipeline_speedup_10img.png)
+- **Время выполнения для 20 изображений**  
+  ![pipeline time 20](results/pipeline_time_20img.png)
+- **Ускорение для 20 изображений**  
+  ![pipeline speedup 20](results/pipeline_speedup_20img.png)
+- **Время от размера набора**  
+  ![pipeline batch size](results/pipeline_batch_size.png)
+
+### Анализ результатов
+
+- **Общая эффективность конвейера.** Конвейерная схема позволяет одновременно читать, обрабатывать и записывать разные изображения, что даёт выигрыш по сравнению с последовательной обработкой одного файла за другим. При 4 потоках ускорение достигает 1.97× для 10 изображений и 2.24× для 20 изображений.
+
+- **Влияние числа потоков.** Оптимальное число потоков для данной системы (4 ядра) — 4–6. При 4 потоках (2 вычислителя) ускорение растёт почти линейно; при 6 потоках (4 вычислителя) прирост сохраняется, но уже не такой значительный. Дальнейшее увеличение до 10 потоков (8 вычислителей) не даёт выигрыша из-за ограниченности физических ядер и накладных расходов на синхронизацию.
+
+- **Роль размера пакета.** Конвейер работает тем эффективнее, чем больше изображений обрабатывается за раз. Для всех стратегий ускорение на 20 изображениях выше, чем на 10 (например, для `tiles` при 4 потоках: 1.90× → 2.24×). Накладные расходы на работу диспетчера и синхронизацию очередей распределяются на большее число изображений, поэтому относительный выигрыш от конвейера выше при пакете из 20 изображений.
+
+- **Сравнение стратегий свёртки.** Стратегии `by_rows` и `tiles` дают наилучшие результаты (ускорение до 2.29×). `tiles` особенно хороша на 4 потоках, `by_rows` — на 10. `per_pixel` показывает высокий разброс времени и при большом числе потоков уступает другим. `sequential` внутри вычислителя ожидаемо медленнее, чем параллельные стратегии.
+
+- **Стабильность измерений.** Для `by_rows` и `tiles` стандартное отклонение умеренное (140–350 мс), что указывает на хорошую воспроизводимость. `per_pixel` демонстрирует значительно больший разброс (до 1300 мс), особенно на 20 изображениях при 10 потоках.
+
+- **Максимальное ускорение.** Наилучший результат зафиксирован для конфигурации **10 потоков, стратегия `by_rows`, 20 изображений** — ускорение **2.29×**.
diff --git a/benchmarks/plot.py b/benchmarks/plot.py
new file mode 100644
index 0000000..b2e41a6
--- /dev/null
+++ b/benchmarks/plot.py
@@ -0,0 +1,146 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+import pandas as pd
+import matplotlib.pyplot as plt
+import matplotlib.ticker as ticker
+import seaborn as sns
+
+CONV_CSV     = sys.argv[1] if len(sys.argv) > 1 else "results/bench.csv"
+PIPELINE_CSV = sys.argv[2] if len(sys.argv) > 2 else "results/bench_pipeline.csv"
+OUT_DIR      = "results"
+CONV_TICKS = [1, 2, 4, 8]
+
+sns.set_theme(style="whitegrid")
+plt.rcParams["figure.dpi"] = 150
+
+os.makedirs(OUT_DIR, exist_ok=True)
+
+
+def save(fig, name):
+    path = os.path.join(OUT_DIR, name)
+    fig.savefig(path, bbox_inches="tight")
+    print(f"Saved: {path}")
+    plt.close(fig)
+
+
+def plot_conv(csv_path):
+    if not os.path.exists(csv_path):
+        print(f"[conv] {csv_path} not found, skipping", file=sys.stderr)
+        return
+
+    df = pd.read_csv(csv_path)
+    print(f"[conv] Loaded {len(df)} rows from {csv_path}")
+
+    parallel = df[df["strategy"] != "sequential"]
+
+    fig, ax = plt.subplots(figsize=(9, 5))
+    for strat, grp in parallel.groupby("strategy"):
+        grp = grp.sort_values("threads")
+        ax.plot(grp["threads"], grp["speedup"], marker="o", linewidth=2, label=strat)
+    ax.axhline(1.0, color="gray", linestyle="--", alpha=0.5, label="baseline")
+    ax.set_xlabel("Threads")
+    ax.set_ylabel("Speedup  (baseline = sequential 1-thread)")
+    ax.set_title("Parallel Speedup per Strategy")
+    ax.xaxis.set_major_locator(ticker.FixedLocator(CONV_TICKS))
+    ax.legend()
+    save(fig, "conv_speedup.png")
+
+    fig, ax = plt.subplots(figsize=(9, 5))
+    for strat, grp in df.groupby("strategy"):
+        grp = grp.sort_values("threads")
+        ax.plot(grp["threads"], grp["mean_ms"], marker="s", linewidth=2, label=strat)
+    ax.set_xlabel("Threads")
+    ax.set_ylabel("Mean time (ms)")
+    ax.set_title("Execution Time per Strategy")
+    ax.xaxis.set_major_locator(ticker.FixedLocator(CONV_TICKS))
+    ax.legend()
+    save(fig, "conv_time.png")
+
+    print("\n[conv] Summary (mean_ms):")
+    pivot = df.pivot_table(index="strategy", columns="threads",
+                           values="mean_ms", aggfunc="mean")
+    print(pivot.round(2).to_string())
+
+
+def plot_pipeline(csv_path):
+    if not os.path.exists(csv_path):
+        print(f"[pipeline] {csv_path} not found, skipping", file=sys.stderr)
+        return
+
+    df = pd.read_csv(csv_path)
+    print(f"\n[pipeline] Loaded {len(df)} rows from {csv_path}")
+
+    if df.empty:
+        print("[pipeline] CSV is empty, skipping", file=sys.stderr)
+        return
+
+    n_images_vals = sorted(df["n_images"].unique())
+
+    for n_images in n_images_vals:
+        sub = df[df["n_images"] == n_images].copy()
+
+        baseline_rows = sub.loc[sub["mode"] == "sequential", "mean_ms"]
+        baseline_ms   = float(baseline_rows.values[0]) if not baseline_rows.empty else None
+
+        pipeline_df = sub[sub["mode"] == "pipeline"].copy()
+        if pipeline_df.empty:
+            continue
+
+        worker_ticks = sorted(pipeline_df["n_workers"].unique().tolist())
+
+        fig, ax = plt.subplots(figsize=(9, 5))
+        for strat, grp in pipeline_df.groupby("conv_strategy"):
+            grp = grp.sort_values("n_workers")
+            ax.plot(grp["n_workers"], grp["speedup"], marker="o", linewidth=2, label=strat)
+        ax.axhline(1.0, color="gray", linestyle="--", alpha=0.5, label="sequential baseline")
+        ax.set_xlabel("Workers")
+        ax.set_ylabel("Speedup  (vs sequential one-by-one)")
+        ax.set_title(f"Pipeline Speedup  ({n_images} images)")
+        ax.xaxis.set_major_locator(ticker.FixedLocator(worker_ticks))
+        ax.legend()
+        save(fig, f"pipeline_speedup_{n_images}img.png")
+
+        fig, ax = plt.subplots(figsize=(9, 5))
+        if baseline_ms is not None:
+            ax.axhline(baseline_ms, color="gray", linestyle="--",
+                       linewidth=1.5, label="sequential")
+        for strat, grp in pipeline_df.groupby("conv_strategy"):
+            grp = grp.sort_values("n_workers")
+            ax.plot(grp["n_workers"], grp["mean_ms"], marker="s", linewidth=2, label=strat)
+        ax.set_xlabel("Workers")
+        ax.set_ylabel("Mean time (ms)")
+        ax.set_title(f"Pipeline Time  ({n_images} images)")
+        ax.xaxis.set_major_locator(ticker.FixedLocator(worker_ticks))
+        ax.legend()
+        save(fig, f"pipeline_time_{n_images}img.png")
+
+    pipeline_all = df[df["mode"] == "pipeline"].copy()
+    seq_all      = df[df["mode"] == "sequential"].copy()
+
+    if not pipeline_all.empty and len(n_images_vals) > 1:
+        fig, ax = plt.subplots(figsize=(9, 5))
+        if not seq_all.empty:
+            seq_pts = seq_all.groupby("n_images")["mean_ms"].mean().reset_index()
+            ax.plot(seq_pts["n_images"], seq_pts["mean_ms"], marker="D",
+                    linestyle="--", color="gray", linewidth=1.5, label="sequential")
+        for nw, grp in pipeline_all.groupby("n_workers"):
+            pts = grp.groupby("n_images")["mean_ms"].mean().reset_index()
+            ax.plot(pts["n_images"], pts["mean_ms"], marker="o", linewidth=2,
+                    label=f"{nw} workers")
+        ax.set_xlabel("Number of images in batch")
+        ax.set_ylabel("Mean time (ms)")
+        ax.set_title("Pipeline Time vs Batch Size")
+        ax.legend()
+        save(fig, "pipeline_batch_size.png")
+
+    print("\n[pipeline] Summary (mean_ms, averaged over conv_strategy):")
+    summary = df[df["mode"] == "pipeline"].pivot_table(
+        index="n_workers", columns="n_images", values="mean_ms", aggfunc="mean")
+    print(summary.round(1).to_string())
+
+
+if __name__ == "__main__":
+    plot_conv(CONV_CSV)
+    plot_pipeline(PIPELINE_CSV)
diff --git a/benchmarks/results/bench_1024.csv b/benchmarks/results/bench_1024.csv
new file mode 100644
index 0000000..b3390f9
--- /dev/null
+++ b/benchmarks/results/bench_1024.csv
@@ -0,0 +1,18 @@
+strategy,threads,width,height,filter,mean_ms,min_ms,max_ms,stddev_ms,speedup
+sequential,1,1024,1024,gaussian5,1580.865,1573.878,1743.640,23.432,1.00
+per_pixel,1,1024,1024,gaussian5,1617.078,1609.452,1632.257,4.178,0.98
+per_pixel,2,1024,1024,gaussian5,832.426,806.513,1314.812,86.645,1.90
+per_pixel,4,1024,1024,gaussian5,785.752,628.071,1439.441,152.227,2.01
+per_pixel,8,1024,1024,gaussian5,639.336,534.342,1106.961,105.842,2.47
+by_rows,1,1024,1024,gaussian5,1601.459,1598.370,1607.782,1.707,0.99
+by_rows,2,1024,1024,gaussian5,836.852,799.117,1298.846,101.671,1.89
+by_rows,4,1024,1024,gaussian5,831.702,628.030,1560.148,165.335,1.90
+by_rows,8,1024,1024,gaussian5,581.172,533.927,674.505,36.856,2.72
+by_cols,1,1024,1024,gaussian5,1615.292,1607.833,1630.588,5.699,0.98
+by_cols,2,1024,1024,gaussian5,812.461,808.365,821.976,3.073,1.95
+by_cols,4,1024,1024,gaussian5,754.739,631.750,853.555,68.012,2.09
+by_cols,8,1024,1024,gaussian5,601.183,552.373,722.492,42.842,2.63
+tiles,1,1024,1024,gaussian5,1604.246,1602.227,1608.627,1.414,0.99
+tiles,2,1024,1024,gaussian5,803.133,800.838,817.890,3.004,1.97
+tiles,4,1024,1024,gaussian5,756.144,620.790,838.037,57.856,2.09
+tiles,8,1024,1024,gaussian5,574.597,533.354,756.702,38.014,2.75
diff --git a/benchmarks/results/bench_512_1.csv b/benchmarks/results/bench_512_1.csv
new file mode 100644
index 0000000..5c3f62e
--- /dev/null
+++ b/benchmarks/results/bench_512_1.csv
@@ -0,0 +1,18 @@
+strategy,threads,width,height,filter,mean_ms,min_ms,max_ms,stddev_ms,speedup
+sequential,1,512,512,gaussian5,394.877,393.201,415.805,3.291,1.00
+per_pixel,1,512,512,gaussian5,404.817,402.709,421.737,2.693,0.98
+per_pixel,2,512,512,gaussian5,216.767,203.375,305.470,19.510,1.82
+per_pixel,4,512,512,gaussian5,267.428,186.651,414.969,64.210,1.48
+per_pixel,8,512,512,gaussian5,187.870,140.583,242.681,27.423,2.10
+by_rows,1,512,512,gaussian5,400.066,399.369,402.782,0.567,0.99
+by_rows,2,512,512,gaussian5,200.357,199.674,206.340,0.947,1.97
+by_rows,4,512,512,gaussian5,242.183,190.044,275.931,24.299,1.63
+by_rows,8,512,512,gaussian5,156.517,141.894,177.730,8.408,2.52
+by_cols,1,512,512,gaussian5,400.708,399.654,403.005,0.817,0.99
+by_cols,2,512,512,gaussian5,200.553,199.668,209.442,1.437,1.97
+by_cols,4,512,512,gaussian5,219.569,184.152,266.234,29.584,1.80
+by_cols,8,512,512,gaussian5,166.910,140.044,267.140,23.838,2.37
+tiles,1,512,512,gaussian5,400.716,399.054,405.016,1.394,0.99
+tiles,2,512,512,gaussian5,201.223,199.922,215.190,2.815,1.96
+tiles,4,512,512,gaussian5,234.076,185.226,319.881,29.856,1.69
+tiles,8,512,512,gaussian5,163.673,140.482,247.685,20.275,2.41
diff --git a/benchmarks/results/bench_512_2.csv b/benchmarks/results/bench_512_2.csv
new file mode 100644
index 0000000..c28e45f
--- /dev/null
+++ b/benchmarks/results/bench_512_2.csv
@@ -0,0 +1,18 @@
+strategy,threads,width,height,filter,mean_ms,min_ms,max_ms,stddev_ms,speedup
+sequential,1,512,512,gaussian5,396.685,392.295,491.766,14.699,1.00
+per_pixel,1,512,512,gaussian5,407.701,401.142,546.467,26.603,0.97
+per_pixel,2,512,512,gaussian5,235.941,200.885,562.304,67.582,1.68
+per_pixel,4,512,512,gaussian5,260.416,187.290,522.834,57.915,1.52
+per_pixel,8,512,512,gaussian5,237.420,152.667,410.943,57.331,1.67
+by_rows,1,512,512,gaussian5,408.769,398.782,835.993,61.085,0.97
+by_rows,2,512,512,gaussian5,224.683,199.346,871.216,100.947,1.77
+by_rows,4,512,512,gaussian5,251.944,185.681,406.967,41.157,1.57
+by_rows,8,512,512,gaussian5,198.327,144.418,367.375,40.965,2.00
+by_cols,1,512,512,gaussian5,410.676,399.556,750.760,51.924,0.97
+by_cols,2,512,512,gaussian5,212.351,199.784,387.411,31.226,1.87
+by_cols,4,512,512,gaussian5,277.652,184.641,433.786,72.877,1.43
+by_cols,8,512,512,gaussian5,200.871,141.111,356.383,45.981,1.97
+tiles,1,512,512,gaussian5,401.210,400.139,413.963,1.926,0.99
+tiles,2,512,512,gaussian5,216.975,199.949,519.042,54.387,1.83
+tiles,4,512,512,gaussian5,277.132,187.353,489.164,50.669,1.43
+tiles,8,512,512,gaussian5,191.309,140.358,328.814,42.359,2.07
diff --git a/benchmarks/results/bench_pipeline.csv b/benchmarks/results/bench_pipeline.csv
new file mode 100644
index 0000000..2ed4656
--- /dev/null
+++ b/benchmarks/results/bench_pipeline.csv
@@ -0,0 +1,43 @@
+mode,n_workers,n_images,width,height,filter,conv_strategy,mean_ms,min_ms,max_ms,stddev_ms,speedup
+sequential,1,10,512,512,gaussian5,sequential,4226.357,4126.492,4714.443,174.909,1.00
+pipeline,3,10,512,512,gaussian5,sequential,4070.554,4053.509,4206.157,45.277,1.04
+pipeline,3,10,512,512,gaussian5,per_pixel,2845.054,2258.771,4058.052,572.015,1.49
+pipeline,3,10,512,512,gaussian5,by_rows,2875.240,2554.098,3770.278,416.347,1.47
+pipeline,3,10,512,512,gaussian5,by_cols,2851.381,2257.959,3186.540,266.954,1.48
+pipeline,3,10,512,512,gaussian5,tiles,2864.457,2408.198,3762.457,370.425,1.48
+pipeline,4,10,512,512,gaussian5,sequential,2425.470,2252.427,2859.181,226.919,1.74
+pipeline,4,10,512,512,gaussian5,per_pixel,2202.746,1808.078,2860.862,352.685,1.92
+pipeline,4,10,512,512,gaussian5,by_rows,2145.505,1673.914,2564.715,274.140,1.97
+pipeline,4,10,512,512,gaussian5,by_cols,2175.680,1804.880,2715.972,320.290,1.94
+pipeline,4,10,512,512,gaussian5,tiles,2220.369,1810.468,2570.568,317.828,1.90
+pipeline,6,10,512,512,gaussian5,sequential,2251.464,1808.474,3311.416,455.317,1.88
+pipeline,6,10,512,512,gaussian5,per_pixel,2058.601,1814.348,2419.193,202.538,2.05
+pipeline,6,10,512,512,gaussian5,by_rows,2150.947,1816.387,2421.100,162.298,1.96
+pipeline,6,10,512,512,gaussian5,by_cols,2244.008,1958.575,2716.814,214.120,1.88
+pipeline,6,10,512,512,gaussian5,tiles,2086.754,1664.236,2410.100,220.140,2.03
+pipeline,10,10,512,512,gaussian5,sequential,2279.668,1803.906,3187.939,432.705,1.85
+pipeline,10,10,512,512,gaussian5,per_pixel,2139.448,1805.321,2605.872,193.474,1.98
+pipeline,10,10,512,512,gaussian5,by_rows,1999.067,1813.608,2275.826,143.290,2.11
+pipeline,10,10,512,512,gaussian5,by_cols,2227.140,1961.670,2582.405,219.185,1.90
+pipeline,10,10,512,512,gaussian5,tiles,2171.633,1968.071,2428.895,168.261,1.95
+sequential,1,20,512,512,gaussian5,sequential,8290.476,8283.055,8302.979,7.968,1.00
+pipeline,3,20,512,512,gaussian5,sequential,8084.054,7955.515,8271.230,117.569,1.03
+pipeline,3,20,512,512,gaussian5,per_pixel,5327.910,4823.668,6171.810,417.200,1.56
+pipeline,3,20,512,512,gaussian5,by_rows,5047.475,4514.125,6013.429,438.776,1.64
+pipeline,3,20,512,512,gaussian5,by_cols,5073.599,4661.345,6173.482,405.075,1.63
+pipeline,3,20,512,512,gaussian5,tiles,5372.494,4814.824,6946.449,657.747,1.54
+pipeline,4,20,512,512,gaussian5,sequential,4409.233,4208.654,5267.112,316.613,1.88
+pipeline,4,20,512,512,gaussian5,per_pixel,3967.494,3306.929,4972.409,538.643,2.09
+pipeline,4,20,512,512,gaussian5,by_rows,4533.475,3309.703,7726.489,1303.295,1.83
+pipeline,4,20,512,512,gaussian5,by_cols,3851.807,3308.383,4825.256,594.967,2.15
+pipeline,4,20,512,512,gaussian5,tiles,3699.037,3308.569,4076.229,228.794,2.24
+pipeline,6,20,512,512,gaussian5,sequential,3747.223,3159.414,4658.798,407.551,2.21
+pipeline,6,20,512,512,gaussian5,per_pixel,3656.919,3175.010,4230.186,342.155,2.27
+pipeline,6,20,512,512,gaussian5,by_rows,3688.082,3310.597,4372.816,352.412,2.25
+pipeline,6,20,512,512,gaussian5,by_cols,3782.056,3317.495,4387.320,335.808,2.19
+pipeline,6,20,512,512,gaussian5,tiles,3772.634,3323.369,4403.580,385.133,2.20
+pipeline,10,20,512,512,gaussian5,sequential,3887.183,3158.710,5132.530,562.992,2.13
+pipeline,10,20,512,512,gaussian5,per_pixel,4316.626,3186.089,7350.846,1308.895,1.92
+pipeline,10,20,512,512,gaussian5,by_rows,3616.142,3180.666,4243.686,351.215,2.29
+pipeline,10,20,512,512,gaussian5,by_cols,3659.325,3335.001,4235.902,314.329,2.27
+pipeline,10,20,512,512,gaussian5,tiles,3701.140,3177.299,4091.702,247.418,2.24
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index 0000000..c7e6231
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diff --git a/images/input/Car.bmp b/images/input/Car.bmp
new file mode 100644
index 0000000..4a88549
Binary files /dev/null and b/images/input/Car.bmp differ
diff --git a/images/input/cat.png b/images/input/cat.png
new file mode 100644
index 0000000..4afc7cb
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diff --git a/images/input/cat_cry.jpeg b/images/input/cat_cry.jpeg
new file mode 100644
index 0000000..c2442e1
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diff --git a/images/input/elbrus.jpeg b/images/input/elbrus.jpeg
new file mode 100644
index 0000000..3157b9e
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diff --git a/images/input/white_cat.jpeg b/images/input/white_cat.jpeg
new file mode 100644
index 0000000..0a12c4c
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diff --git a/images/output/blur.jpeg b/images/output/blur.jpeg
new file mode 100644
index 0000000..9b66fef
Binary files /dev/null and b/images/output/blur.jpeg differ
diff --git a/images/output/edges.jpeg b/images/output/edges.jpeg
new file mode 100644
index 0000000..6fac4a1
Binary files /dev/null and b/images/output/edges.jpeg differ
diff --git a/images/output/emboss.jpeg b/images/output/emboss.jpeg
new file mode 100644
index 0000000..2926589
Binary files /dev/null and b/images/output/emboss.jpeg differ
diff --git a/images/output/gaussian.bmp b/images/output/gaussian.bmp
new file mode 100644
index 0000000..054912e
Binary files /dev/null and b/images/output/gaussian.bmp differ
diff --git a/images/output/sharpen.jpeg b/images/output/sharpen.jpeg
new file mode 100644
index 0000000..efc0cdd
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diff --git a/include/cli.h b/include/cli.h
new file mode 100644
index 0000000..294cbcb
--- /dev/null
+++ b/include/cli.h
@@ -0,0 +1,34 @@
+#pragma once
+#include "conv.h"
+
+typedef struct {
+	const char *input_path;
+	const char *output_path;
+	const char *filter_name;
+	ParallelStrategy strategy;
+} CliConfig;
+
+typedef struct {
+	char **input_paths;
+	char **output_paths;
+	size_t file_count;
+	const char *filter_name;
+	ParallelStrategy strategy;
+	size_t n_workers;
+} CliPipelineConfig;
+
+typedef enum {
+	CLI_MODE_SINGLE,
+	CLI_MODE_PIPELINE,
+} CliMode;
+
+typedef struct {
+	CliMode mode;
+	union {
+		CliConfig single;
+		CliPipelineConfig pipeline;
+	};
+} CliArgs;
+
+int cli_parse(int argc, char *argv[], CliArgs *out);
+void cli_print_help(const char *prog_name);
diff --git a/include/conv.h b/include/conv.h
new file mode 100644
index 0000000..eccce11
--- /dev/null
+++ b/include/conv.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include "filters.h"
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct {
+	uint8_t *pixels;
+	size_t width;
+	size_t height;
+	int channels;
+} Image;
+
+typedef enum {
+	STRATEGY_SEQUENTIAL,
+	STRATEGY_BY_ROWS,
+	STRATEGY_BY_COLS,
+	STRATEGY_PER_PIXEL,
+	STRATEGY_TILES,
+} ParallelStrategy;
+
+void convolve_sequential(const Image *input, Image *output, const struct Filter *filter);
+
+void convolve_parallel(const Image *input, Image *output, const struct Filter *filter,
+					   ParallelStrategy strategy);
diff --git a/include/filters.h b/include/filters.h
new file mode 100644
index 0000000..3ba7715
--- /dev/null
+++ b/include/filters.h
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <stddef.h>
+
+struct Filter {
+	size_t size;
+	double *data;
+	double factor;
+	double bias;
+};
+
+/* 3x3 filters */
+struct Filter filter_identity(void);
+struct Filter filter_blur(void);
+struct Filter filter_gaussian(void);
+struct Filter filter_sharpen(void);
+struct Filter filter_edges(void);
+struct Filter filter_emboss(void);
+
+/* 5x5 filters */
+struct Filter filter_blur5(void);
+struct Filter filter_gaussian5(void);
+struct Filter filter_sharpen5(void);
+struct Filter filter_edges5(void);
+struct Filter filter_emboss5(void);
+
+/* 7x7 filters */
+struct Filter filter_blur7(void);
+struct Filter filter_gaussian7(void);
+struct Filter filter_sharpen7(void);
+struct Filter filter_edges7(void);
+struct Filter filter_emboss7(void);
+
+/* 9x9 filters */
+struct Filter filter_blur9(void);
+struct Filter filter_gaussian9(void);
+struct Filter filter_sharpen9(void);
+struct Filter filter_edges9(void);
+struct Filter filter_emboss9(void);
+
+typedef struct {
+	const char *name;
+	struct Filter (*create)(void);
+} FilterDef;
+
+extern const FilterDef filter_list[];
+extern const size_t filter_count;
diff --git a/include/imgio.h b/include/imgio.h
new file mode 100644
index 0000000..fea391d
--- /dev/null
+++ b/include/imgio.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#include "conv.h"
+
+int imgio_load(const char *path, Image *img);
+int imgio_save(const char *path, const Image *img);
+void imgio_free(Image *img);
diff --git a/include/pipeline.h b/include/pipeline.h
new file mode 100644
index 0000000..58d33d8
--- /dev/null
+++ b/include/pipeline.h
@@ -0,0 +1,60 @@
+#pragma once
+
+#include "conv.h"
+#include "filters.h"
+#include "queue.h"
+
+#include <pthread.h>
+#include <stdatomic.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#define QUEUE_RAW_CAP 8
+#define QUEUE_CONV_CAP 8
+#define DISPATCHER_INTERVAL_MS 150
+
+typedef struct {
+	char *output_path;
+	Image src;
+	Image dst;
+} PipelineItem;
+
+typedef enum {
+	ROLE_READER,
+	ROLE_CONVOLVER,
+	ROLE_WRITER,
+} WorkerRole;
+
+typedef struct {
+	Queue conv_queue;
+	Queue write_queue;
+	const struct Filter *filter;
+	char **input_paths;
+	char **output_paths;
+	size_t file_count;
+	size_t read_cursor;
+	pthread_mutex_t read_mutex;
+	size_t files_written;
+	pthread_mutex_t write_mutex;
+	ParallelStrategy strategy;
+} PipelineState;
+
+typedef struct {
+	WorkerRole role;
+	WorkerRole requested_role;
+	pthread_mutex_t role_mutex;
+	PipelineState *state;
+	pthread_t thread;
+	atomic_size_t running;
+} Worker;
+
+typedef struct {
+	Worker *workers;
+	size_t n_workers;
+	PipelineState *state;
+	pthread_t thread;
+	atomic_size_t running;
+} Dispatcher;
+
+void pipeline_run(char **input_paths, char **output_paths, size_t count,
+				  const struct Filter *filter, ParallelStrategy strategy, size_t n_workers);
diff --git a/include/queue.h b/include/queue.h
new file mode 100644
index 0000000..f8e42a2
--- /dev/null
+++ b/include/queue.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <pthread.h>
+#include <stddef.h>
+
+typedef struct {
+	void **ring_buffer;
+	size_t capacity;
+	size_t head;
+	size_t tail;
+	size_t count;
+
+	pthread_mutex_t mutex;
+	pthread_cond_t not_full;
+	pthread_cond_t not_empty;
+
+	int done;
+} Queue;
+
+int queue_init(Queue *queue, size_t capacity);
+
+void queue_free(Queue *queue);
+
+void queue_push(Queue *queue, void *item);
+
+void *queue_pop(Queue *queue);
+
+void queue_stop(Queue *queue);
+
+size_t queue_size(Queue *queue);
diff --git a/src/lib/cli.c b/src/lib/cli.c
new file mode 100644
index 0000000..9aa4672
--- /dev/null
+++ b/src/lib/cli.c
@@ -0,0 +1,207 @@
+#include "cli.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void cli_print_help(const char *prog) {
+	printf("Usage: %s <input> <output> --filter <name> [--strategy <name>]\n"
+		   "\n"
+		   "Arguments:\n"
+		   "  input              Input image (BMP/PNG/JPG)\n"
+		   "  output             Output image (BMP/PNG/JPG)\n"
+		   "\n"
+		   "Options:\n"
+		   "  --filter <name>    Filter: identity, blur, gaussian, sharpen, edges, emboss\n"
+		   "                     Add suffix 5/7/9 for larger kernels (e.g. emboss9)\n"
+		   "  --strategy <name>  Parallelisation strategy (default: sequential)\n"
+		   "                       sequential — single-threaded\n"
+		   "                       rows       — one row per task\n"
+		   "                       cols       — one column per task\n"
+		   "                       pixels     — one pixel per task\n"
+		   "                       tiles      — 128x32 tiles\n"
+		   "  -h, --help         Show this help\n"
+		   "\n"
+		   "Pipeline mode: %s --pipeline --help\n"
+		   "\n"
+		   "Example:\n"
+		   "  %s photo.bmp out.bmp --filter edges5 --strategy rows\n",
+		   prog, prog, prog);
+}
+
+void cli_print_pipeline_help(const char *prog) {
+	printf("Usage: %s --pipeline --filter <name> [options]"
+		   " <in1> <out1> [<in2> <out2> ...]\n"
+		   "\n"
+		   "Options:\n"
+		   "  --filter <name>    Filter name (same set as single-image mode)\n"
+		   "  --strategy <name>  Convolution strategy used inside each worker\n"
+		   "                     (default: rows)\n"
+		   "  --workers <N>      Total worker threads (default: 4, minimum: 3)\n"
+		   "  -h, --help         Show this help\n"
+		   "\n"
+		   "Paths must be given as consecutive input/output pairs.\n"
+		   "\n"
+		   "Example:\n"
+		   "  %s --pipeline --filter gaussian --workers 6 \\\n"
+		   "     a.png a_out.png b.jpg b_out.jpg c.bmp c_out.bmp\n",
+		   prog, prog);
+}
+
+static ParallelStrategy parse_strategy(const char *s) {
+	if (strcmp(s, "rows") == 0) return STRATEGY_BY_ROWS;
+	if (strcmp(s, "cols") == 0) return STRATEGY_BY_COLS;
+	if (strcmp(s, "pixels") == 0) return STRATEGY_PER_PIXEL;
+	if (strcmp(s, "tiles") == 0) return STRATEGY_TILES;
+	return STRATEGY_SEQUENTIAL;
+}
+
+static int parse_single(int argc, char *argv[], CliConfig *cfg) {
+	cfg->input_path = NULL;
+	cfg->output_path = NULL;
+	cfg->filter_name = NULL;
+	cfg->strategy = STRATEGY_SEQUENTIAL;
+	int pos = 0;
+
+	for (int i = 1; i < argc; ++i) {
+		if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
+			cli_print_help(argv[0]);
+			return 0;
+		}
+		if (strcmp(argv[i], "--filter") == 0) {
+			if (++i < argc) {
+				cfg->filter_name = argv[i];
+			} else {
+				fprintf(stderr, "Error: --filter requires a value\n");
+				return 0;
+			}
+			continue;
+		}
+		if (strcmp(argv[i], "--strategy") == 0) {
+			if (++i < argc) {
+				cfg->strategy = parse_strategy(argv[i]);
+			} else {
+				fprintf(stderr, "Error: --strategy requires a value\n");
+				return 0;
+			}
+			continue;
+		}
+		if (pos == 0) {
+			cfg->input_path = argv[i];
+		} else if (pos == 1) {
+			cfg->output_path = argv[i];
+		} else {
+			fprintf(stderr, "Error: too many positional arguments\n");
+			return 0;
+		}
+		pos++;
+	}
+
+	if (!cfg->input_path || !cfg->output_path || !cfg->filter_name) {
+		fprintf(stderr, "Error: missing required arguments\n");
+		cli_print_help(argv[0]);
+		return 0;
+	}
+	return 1;
+}
+
+static int parse_pipeline(int argc, char *argv[], CliPipelineConfig *cfg) {
+	cfg->filter_name = NULL;
+	cfg->strategy = STRATEGY_BY_ROWS;
+	cfg->n_workers = 4;
+	cfg->file_count = 0;
+	cfg->input_paths = malloc((size_t)argc * sizeof(char *));
+	cfg->output_paths = malloc((size_t)argc * sizeof(char *));
+	if (!cfg->input_paths || !cfg->output_paths) {
+		fprintf(stderr, "Error: out of memory\n");
+		free(cfg->input_paths);
+		free(cfg->output_paths);
+		return 0;
+	}
+
+	for (int i = 1; i < argc; ++i) {
+		if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
+			cli_print_pipeline_help(argv[0]);
+			free(cfg->input_paths);
+			free(cfg->output_paths);
+			return 0;
+		}
+		if (strcmp(argv[i], "--pipeline") == 0) continue;
+		if (strcmp(argv[i], "--filter") == 0) {
+			if (++i < argc) {
+				cfg->filter_name = argv[i];
+			} else {
+				fprintf(stderr, "Error: --filter requires a value\n");
+				free(cfg->input_paths);
+				free(cfg->output_paths);
+				return 0;
+			}
+			continue;
+		}
+		if (strcmp(argv[i], "--strategy") == 0) {
+			if (++i < argc)
+				cfg->strategy = parse_strategy(argv[i]);
+			else {
+				fprintf(stderr, "Error: --strategy requires a value\n");
+				free(cfg->input_paths);
+				free(cfg->output_paths);
+				return 0;
+			}
+			continue;
+		}
+		if (strcmp(argv[i], "--workers") == 0) {
+			if (++i < argc) {
+				int n = atoi(argv[i]);
+				if (n < 1) {
+					fprintf(stderr, "Error: --workers must be >= 1\n");
+					free(cfg->input_paths);
+					free(cfg->output_paths);
+					return 0;
+				}
+				cfg->n_workers = (size_t)n;
+			} else {
+				fprintf(stderr, "Error: --workers requires a value\n");
+				free(cfg->input_paths);
+				free(cfg->output_paths);
+				return 0;
+			}
+			continue;
+		}
+		if (i + 1 < argc) {
+			cfg->input_paths[cfg->file_count] = argv[i];
+			cfg->output_paths[cfg->file_count] = argv[i + 1];
+			cfg->file_count++;
+			i++;
+		} else {
+			fprintf(stderr, "Error: unpaired path '%s'\n", argv[i]);
+			free(cfg->input_paths);
+			free(cfg->output_paths);
+			return 0;
+		}
+	}
+
+	if (!cfg->filter_name) {
+		fprintf(stderr, "Error: --filter is required\n");
+		free(cfg->input_paths);
+		free(cfg->output_paths);
+		return 0;
+	}
+	if (cfg->file_count == 0) {
+		fprintf(stderr, "Error: no input/output pairs provided\n");
+		cli_print_pipeline_help(argv[0]);
+		free(cfg->input_paths);
+		free(cfg->output_paths);
+		return 0;
+	}
+	return 1;
+}
+
+int cli_parse(int argc, char *argv[], CliArgs *out) {
+	for (int i = 1; i < argc; i++) {
+		if (strcmp(argv[i], "--pipeline") == 0) {
+			out->mode = CLI_MODE_PIPELINE;
+			return parse_pipeline(argc, argv, &out->pipeline);
+		}
+	}
+	out->mode = CLI_MODE_SINGLE;
+	return parse_single(argc, argv, &out->single);
+}
diff --git a/src/lib/conv.c b/src/lib/conv.c
new file mode 100644
index 0000000..0e4469d
--- /dev/null
+++ b/src/lib/conv.c
@@ -0,0 +1,142 @@
+#include "conv.h"
+#include <stddef.h>
+#include <stdint.h>
+
+#define PIXEL_MIN 0
+#define PIXEL_MAX 255
+#define ROUNDING_OFFSET 0.5
+#define TILE_HEIGHT 32
+#define TILE_WIDTH 128
+
+void convolve_sequential(const Image *input, Image *output, const struct Filter *filter) {
+	const int radius = (int)(filter->size / 2);
+	const double factor = filter->factor;
+	const double bias = filter->bias;
+	const double *kernel = filter->data;
+
+	const size_t width = input->width;
+	const size_t height = input->height;
+	const int channels = input->channels;
+	const size_t stride = width * channels;
+
+	for (size_t y = 0; y < height; ++y) {
+		for (size_t x = 0; x < width; ++x) {
+			for (int c = 0; c < channels; ++c) {
+				double acc = 0.0;
+				for (int fy = 0; fy < (int)filter->size; ++fy) {
+					for (int fx = 0; fx < (int)filter->size; ++fx) {
+						int sy = (int)y + fy - radius;
+						int sx = (int)x + fx - radius;
+						sy %= (int)height;
+						if (sy < 0) sy += (int)height;
+						sx %= (int)width;
+						if (sx < 0) sx += (int)width;
+						double pixel =
+							input->pixels[(size_t)sy * stride + (size_t)sx * channels + (size_t)c];
+						acc += kernel[fy * filter->size + fx] * pixel;
+					}
+				}
+				double value = acc * factor + bias;
+				if (value < PIXEL_MIN) value = PIXEL_MIN;
+				if (value > PIXEL_MAX) value = PIXEL_MAX;
+				output->pixels[y * stride + x * channels + c] = (uint8_t)(value + ROUNDING_OFFSET);
+			}
+		}
+	}
+}
+
+static inline int wrap(int v, int size) {
+	int r = v % size;
+	return r < 0 ? r + size : r;
+}
+
+static inline size_t min_sz(size_t a, size_t b) { return a < b ? a : b; }
+
+static void compute_pixel(const Image *input, Image *output, size_t x, size_t y,
+						  const struct Filter *filter, int radius) {
+	const int ch = input->channels;
+	const size_t stride = input->width * (size_t)ch;
+	const size_t ksize = filter->size;
+
+	for (int c = 0; c < ch; ++c) {
+		double acc = 0.0;
+		for (int fy = 0; fy < (int)ksize; ++fy) {
+			for (int fx = 0; fx < (int)ksize; ++fx) {
+				int sx = wrap((int)x + fx - radius, (int)input->width);
+				int sy = wrap((int)y + fy - radius, (int)input->height);
+				acc += filter->data[fy * ksize + fx] *
+					   input->pixels[(size_t)sy * stride + (size_t)sx * (size_t)ch + (size_t)c];
+			}
+		}
+		double val = acc * filter->factor + filter->bias;
+		if (val < PIXEL_MIN) val = PIXEL_MIN;
+		if (val > PIXEL_MAX) val = PIXEL_MAX;
+		output->pixels[y * stride + x * (size_t)ch + (size_t)c] = (uint8_t)(val + ROUNDING_OFFSET);
+	}
+}
+
+static void parallel_by_rows(const Image *input, Image *output, const struct Filter *filter,
+							 int radius) {
+#pragma omp parallel for schedule(static)
+	for (size_t y = 0; y < input->height; ++y)
+		for (size_t x = 0; x < input->width; ++x)
+			compute_pixel(input, output, x, y, filter, radius);
+}
+
+static void parallel_by_cols(const Image *input, Image *output, const struct Filter *filter,
+							 int radius) {
+#pragma omp parallel for schedule(static)
+	for (size_t x = 0; x < input->width; ++x)
+		for (size_t y = 0; y < input->height; ++y)
+			compute_pixel(input, output, x, y, filter, radius);
+}
+
+static void parallel_per_pixel(const Image *input, Image *output, const struct Filter *filter,
+							   int radius) {
+	const size_t total = input->width * input->height;
+#pragma omp parallel for schedule(static)
+	for (size_t idx = 0; idx < total; ++idx)
+		compute_pixel(input, output, idx % input->width, idx / input->width, filter, radius);
+}
+
+static void parallel_tiles(const Image *input, Image *output, const struct Filter *filter,
+						   int radius) {
+	const size_t W = input->width;
+	const size_t H = input->height;
+	const size_t ntiles_x = (W + TILE_WIDTH - 1) / TILE_WIDTH;
+	const size_t ntiles_y = (H + TILE_HEIGHT - 1) / TILE_HEIGHT;
+	const size_t ntiles = ntiles_x * ntiles_y;
+
+#pragma omp parallel for schedule(static)
+	for (size_t t = 0; t < ntiles; ++t) {
+		size_t tx = t % ntiles_x;
+		size_t ty = t / ntiles_x;
+		size_t x0 = tx * TILE_WIDTH, x1 = min_sz(x0 + TILE_WIDTH, W);
+		size_t y0 = ty * TILE_HEIGHT, y1 = min_sz(y0 + TILE_HEIGHT, H);
+		for (size_t y = y0; y < y1; ++y)
+			for (size_t x = x0; x < x1; ++x) compute_pixel(input, output, x, y, filter, radius);
+	}
+}
+
+void convolve_parallel(const Image *input, Image *output, const struct Filter *filter,
+					   ParallelStrategy strategy) {
+	const int radius = (int)(filter->size / 2);
+	switch (strategy) {
+	case STRATEGY_BY_ROWS:
+		parallel_by_rows(input, output, filter, radius);
+		break;
+	case STRATEGY_BY_COLS:
+		parallel_by_cols(input, output, filter, radius);
+		break;
+	case STRATEGY_PER_PIXEL:
+		parallel_per_pixel(input, output, filter, radius);
+		break;
+	case STRATEGY_TILES:
+		parallel_tiles(input, output, filter, radius);
+		break;
+	case STRATEGY_SEQUENTIAL:
+	default:
+		convolve_sequential(input, output, filter);
+		break;
+	}
+}
diff --git a/src/lib/filters.c b/src/lib/filters.c
new file mode 100644
index 0000000..e50fded
--- /dev/null
+++ b/src/lib/filters.c
@@ -0,0 +1,334 @@
+#include "filters.h"
+
+static struct Filter make_filter(size_t size, double *data, double factor, double bias) {
+	struct Filter f;
+	f.size = size;
+	f.data = data;
+	f.factor = factor;
+	f.bias = bias;
+	return f;
+}
+
+struct Filter filter_identity(void) {
+	// clang-format off
+	static double m[9] = {
+		0, 0, 0,
+		0, 1, 0,
+		0, 0, 0
+	};
+	// clang-format on
+	return make_filter(3, m, 1.0, 0.0);
+}
+
+struct Filter filter_blur(void) {
+	// clang-format off
+	static double m[9] = {
+		0.0, 0.2, 0.0,
+		0.2, 0.2, 0.2,
+		0.0, 0.2, 0.0
+	};
+	// clang-format on
+	return make_filter(3, m, 1.0, 0.0);
+}
+
+struct Filter filter_gaussian(void) {
+	// clang-format off
+	static double m[9] = {
+		1, 2, 1,
+		2, 4, 2,
+		1, 2, 1
+	};
+	// clang-format on
+	return make_filter(3, m, 1.0 / 16.0, 0.0);
+}
+
+struct Filter filter_sharpen(void) {
+	// clang-format off
+	static double m[9] = {
+		-1, -1, -1,
+		-1,  9, -1,
+		-1, -1, -1
+	};
+	// clang-format on
+	return make_filter(3, m, 1.0, 0.0);
+}
+
+struct Filter filter_edges(void) {
+	// clang-format off
+	static double m[9] = {
+		-1, -1, -1,
+		-1,  8, -1,
+		-1, -1, -1
+	};
+	// clang-format on
+	return make_filter(3, m, 1.0, 0.0);
+}
+
+struct Filter filter_emboss(void) {
+	// clang-format off
+	static double m[9] = {
+		-2, -1,  0,
+		-1,  1,  1,
+		0,  1,  2
+	};
+	// clang-format on
+	return make_filter(3, m, 1.0, 128.0);
+}
+
+struct Filter filter_blur5(void) {
+	// clang-format off
+	static double m[25] = {
+		0, 0, 1, 0, 0,
+		0, 1, 1, 1, 0,
+		1, 1, 1, 1, 1,
+		0, 1, 1, 1, 0,
+		0, 0, 1, 0, 0
+	};
+	// clang-format on
+	return make_filter(5, m, 1.0 / 13.0, 0.0);
+}
+
+struct Filter filter_gaussian5(void) {
+	// clang-format off
+	static double m[25] = {
+		1,  4,  6,  4,  1,
+		4, 16, 24, 16,  4,
+		6,  24, 36, 24,  6,
+		4, 16, 24, 16,  4,
+		1,  4,  6,  4,  1
+	};
+	// clang-format on
+	return make_filter(5, m, 1.0 / 256.0, 0.0);
+}
+
+struct Filter filter_sharpen5(void) {
+	// clang-format off
+	static double m[25] = {
+		-1, -1, -1, -1, -1,
+		-1,  2,  2,  2, -1,
+		-1,  2,  8,  2, -1,
+		-1,  2,  2,  2, -1,
+		-1, -1, -1, -1, -1
+	};
+	// clang-format on
+	return make_filter(5, m, 1.0 / 8.0, 0.0);
+}
+
+struct Filter filter_edges5(void) {
+	// clang-format off
+	static double m[25] = {
+		 0, -1, -1, -1,  0,
+		-1, -1, -1, -1, -1,
+		-1, -1, 24, -1, -1,
+		-1, -1, -1, -1, -1,
+		 0, -1, -1, -1,  0
+	};
+	// clang-format on
+	return make_filter(5, m, 1.0, 0.0);
+}
+
+struct Filter filter_emboss5(void) {
+	// clang-format off
+	static double m[25] = {
+		-4, -3, -2, -1,  0,
+		-3, -2, -1,  0,  1,
+		-2, -1,  1,  1,  2,
+		-1,  0,  1,  2,  3,
+		 0,  1,  2,  3,  4
+	};
+	// clang-format on
+	return make_filter(5, m, 1.0, 128.0);
+}
+
+struct Filter filter_blur7(void) {
+	// clang-format off
+	static double m[49] = {
+		0, 0, 0, 1, 0, 0, 0,
+		0, 0, 1, 1, 1, 0, 0,
+		0, 1, 1, 1, 1, 1, 0,
+		1, 1, 1, 1, 1, 1, 1,
+		0, 1, 1, 1, 1, 1, 0,
+		0, 0, 1, 1, 1, 0, 0,
+		0, 0, 0, 1, 0, 0, 0
+	};
+	// clang-format on
+	return make_filter(7, m, 1.0 / 25.0, 0.0);
+}
+
+struct Filter filter_gaussian7(void) {
+	// clang-format off
+	static double m[49] = {
+		 1,   6,  15,  20,  15,   6,   1,
+		 6,  36,  90, 120,  90,  36,   6,
+		15,  90, 225, 300, 225,  90,  15,
+		20, 120, 300, 400, 300, 120,  20,
+		15,  90, 225, 300, 225,  90,  15,
+		 6,  36,  90, 120,  90,  36,   6,
+		 1,   6,  15,  20,  15,   6,   1
+	};
+	// clang-format on
+	return make_filter(7, m, 1.0 / 4096.0, 0.0);
+}
+
+struct Filter filter_sharpen7(void) {
+	// clang-format off
+	static double m[49] = {
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1,  2,  2,  2, -1, -1,
+		-1, -1,  2, 36,  2, -1, -1,
+		-1, -1,  2,  2,  2, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1
+	};
+	// clang-format on
+	return make_filter(7, m, 1.0 / 12.0, 0.0);
+}
+
+struct Filter filter_edges7(void) {
+	// clang-format off
+	static double m[49] = {
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, 48, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1
+	};
+	// clang-format on
+	return make_filter(7, m, 1.0, 0.0);
+}
+
+struct Filter filter_emboss7(void) {
+	// clang-format off
+	static double m[49] = {
+		-6, -5, -4, -3, -2, -1,  0,
+		-5, -4, -3, -2, -1,  0,  1,
+		-4, -3, -2, -1,  0,  1,  2,
+		-3, -2, -1,  1,  1,  2,  3,
+		-2, -1,  0,  1,  2,  3,  4,
+		-1,  0,  1,  2,  3,  4,  5,
+		 0,  1,  2,  3,  4,  5,  6
+	};
+	// clang-format on
+	return make_filter(7, m, 1.0, 128.0);
+}
+
+struct Filter filter_blur9(void) {
+	// clang-format off
+	static double m[81] = {
+		0, 0, 0, 0, 1, 0, 0, 0, 0,
+		0, 0, 0, 1, 1, 1, 0, 0, 0,
+		0, 0, 1, 1, 1, 1, 1, 0, 0,
+		0, 1, 1, 1, 1, 1, 1, 1, 0,
+		1, 1, 1, 1, 1, 1, 1, 1, 1,
+		0, 1, 1, 1, 1, 1, 1, 1, 0,
+		0, 0, 1, 1, 1, 1, 1, 0, 0,
+		0, 0, 0, 1, 1, 1, 0, 0, 0,
+		0, 0, 0, 0, 1, 0, 0, 0, 0
+	};
+	// clang-format on
+	return make_filter(9, m, 1.0 / 41.0, 0.0);
+}
+
+struct Filter filter_gaussian9(void) {
+	// clang-format off
+	static double m[81] = {
+		 1,   8,  28,  56,  70,  56,  28,   8,   1,
+		 8,  64, 224, 448, 560, 448, 224,  64,   8,
+		28, 224, 784,1568,1960,1568, 784, 224,  28,
+		56, 448,1568,3136,3920,3136,1568, 448,  56,
+		70, 560,1960,3920,4900,3920,1960, 560,  70,
+		56, 448,1568,3136,3920,3136,1568, 448,  56,
+		28, 224, 784,1568,1960,1568, 784, 224,  28,
+		 8,  64, 224, 448, 560, 448, 224,  64,   8,
+		 1,   8,  28,  56,  70,  56,  28,   8,   1
+    };
+	// clang-format on
+	return make_filter(9, m, 1.0 / 65536.0, 0.0);
+}
+
+struct Filter filter_sharpen9(void) {
+	// clang-format off
+	static double m[81] = {
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1,  2,  2,  2, -1, -1, -1,
+		-1, -1, -1,  2, 65,  2, -1, -1, -1,
+		-1, -1, -1,  2,  2,  2, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1
+	};
+	// clang-format on
+	return make_filter(9, m, 1.0 / 16.0, 0.0);
+}
+
+struct Filter filter_edges9(void) {
+	// clang-format off
+	static double m[81] = {
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, 80, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1
+	};
+	// clang-format on
+	return make_filter(9, m, 1.0, 0.0);
+}
+
+struct Filter filter_emboss9(void) {
+	// clang-format off
+	static double m[81] = {
+		-8, -7, -6, -5, -4, -3, -2, -1,  0,
+		-7, -6, -5, -4, -3, -2, -1,  0,  1,
+		-6, -5, -4, -3, -2, -1,  0,  1,  2,
+		-5, -4, -3, -2, -1,  0,  1,  2,  3,
+		-4, -3, -2, -1,  1,  1,  2,  3,  4,
+		-3, -2, -1,  0,  1,  2,  3,  4,  5,
+		-2, -1,  0,  1,  2,  3,  4,  5,  6,
+		-1,  0,  1,  2,  3,  4,  5,  6,  7,
+		 0,  1,  2,  3,  4,  5,  6,  7,  8
+	};
+	// clang-format on
+	return make_filter(9, m, 1.0, 128.0);
+}
+
+const FilterDef filter_list[] = {
+	/* 3×3 */
+	{"identity", filter_identity},
+	{"blur", filter_blur},
+	{"gaussian", filter_gaussian},
+	{"sharpen", filter_sharpen},
+	{"edges", filter_edges},
+	{"emboss", filter_emboss},
+
+	/* 5×5 */
+	{"blur5", filter_blur5},
+	{"gaussian5", filter_gaussian5},
+	{"sharpen5", filter_sharpen5},
+	{"edges5", filter_edges5},
+	{"emboss5", filter_emboss5},
+
+	/* 7×7 */
+	{"blur7", filter_blur7},
+	{"gaussian7", filter_gaussian7},
+	{"sharpen7", filter_sharpen7},
+	{"edges7", filter_edges7},
+	{"emboss7", filter_emboss7},
+
+	/* 9×9 */
+	{"blur9", filter_blur9},
+	{"gaussian9", filter_gaussian9},
+	{"sharpen9", filter_sharpen9},
+	{"edges9", filter_edges9},
+	{"emboss9", filter_emboss9},
+};
+
+const size_t filter_count = sizeof(filter_list) / sizeof(filter_list[0]);
diff --git a/src/lib/imgio.c b/src/lib/imgio.c
new file mode 100644
index 0000000..05592f3
--- /dev/null
+++ b/src/lib/imgio.c
@@ -0,0 +1,57 @@
+#include "imgio.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"
+
+#include <ctype.h>
+#include <string.h>
+
+#define DEFAULT_JPEG_QUALITY 95
+#define MAX_EXT_LEN 16
+
+static void get_ext(const char *path, char *out, int max_len) {
+	const char *dot = strrchr(path, '.');
+	out[0] = '\0';
+	if (!dot || !dot[1]) return;
+	for (int i = 0; dot[i + 1] && i < max_len - 1; i++) {
+		out[i] = (char)tolower((unsigned char)dot[i + 1]);
+	}
+}
+
+int imgio_load(const char *path, Image *img) {
+	int w = 0;
+	int h = 0;
+	int ch = 0;
+	uint8_t *pixels = stbi_load(path, &w, &h, &ch, 3);
+	if (!pixels) return 0;
+	img->pixels = pixels;
+	img->width = (size_t)w;
+	img->height = (size_t)h;
+	img->channels = 3;
+	return 1;
+}
+
+int imgio_save(const char *path, const Image *img) {
+	char ext[MAX_EXT_LEN] = {0};
+	get_ext(path, ext, sizeof(ext));
+	int w = (int)img->width;
+	int h = (int)img->height;
+	int c = img->channels;
+	if (strcmp(ext, "png") == 0) {
+		return stbi_write_png(path, w, h, c, img->pixels, 0);
+	} else if (strcmp(ext, "jpg") == 0 || strcmp(ext, "jpeg") == 0) {
+		return stbi_write_jpg(path, w, h, c, img->pixels, DEFAULT_JPEG_QUALITY);
+	} else {
+		return stbi_write_bmp(path, w, h, c, img->pixels);
+	}
+}
+
+void imgio_free(Image *img) {
+	if (img && img->pixels) {
+		stbi_image_free(img->pixels);
+		img->pixels = NULL;
+	}
+}
diff --git a/src/lib/pipeline.c b/src/lib/pipeline.c
new file mode 100644
index 0000000..eadce16
--- /dev/null
+++ b/src/lib/pipeline.c
@@ -0,0 +1,285 @@
+#include "pipeline.h"
+
+#include "imgio.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+static void msleep(int ms) {
+	struct timespec ts = {.tv_sec = ms / 1000, .tv_nsec = (ms % 1000) * 1000000L};
+	nanosleep(&ts, NULL);
+}
+
+static void item_free(PipelineItem *item) {
+	if (!item) return;
+	imgio_free(&item->src);
+	free(item->dst.pixels);
+	free(item);
+}
+
+static void do_read(PipelineState *ps) {
+	pthread_mutex_lock(&ps->read_mutex);
+	if (ps->read_cursor >= ps->file_count) {
+		pthread_mutex_unlock(&ps->read_mutex);
+		return;
+	}
+	size_t idx = ps->read_cursor++;
+	pthread_mutex_unlock(&ps->read_mutex);
+
+	PipelineItem *item = calloc(1, sizeof(*item));
+	if (!item) {
+		fprintf(stderr, "failed to allocate item for '%s'\n", ps->input_paths[idx]);
+		pthread_mutex_lock(&ps->write_mutex);
+		ps->files_written++;
+		pthread_mutex_unlock(&ps->write_mutex);
+		return;
+	}
+
+	if (!imgio_load(ps->input_paths[idx], &item->src)) {
+		fprintf(stderr, "failed to load '%s'\n", ps->input_paths[idx]);
+		free(item);
+		pthread_mutex_lock(&ps->write_mutex);
+		ps->files_written++;
+		pthread_mutex_unlock(&ps->write_mutex);
+		return;
+	}
+
+	item->output_path = ps->output_paths[idx];
+
+	size_t dst_bytes = item->src.width * item->src.height * (size_t)item->src.channels;
+	item->dst.pixels = malloc(dst_bytes);
+	if (!item->dst.pixels) {
+		fprintf(stderr, "failed to allocate dst buffer for '%s'\n", ps->input_paths[idx]);
+		imgio_free(&item->src);
+		free(item);
+		pthread_mutex_lock(&ps->write_mutex);
+		ps->files_written++;
+		pthread_mutex_unlock(&ps->write_mutex);
+		return;
+	}
+
+	item->dst.width = item->src.width;
+	item->dst.height = item->src.height;
+	item->dst.channels = item->src.channels;
+
+	queue_push(&ps->conv_queue, item);
+}
+
+static void do_convolve(PipelineState *ps) {
+	PipelineItem *item = queue_pop(&ps->conv_queue);
+	if (!item) return;
+	convolve_parallel(&item->src, &item->dst, ps->filter, ps->strategy);
+	queue_push(&ps->write_queue, item);
+}
+
+static void do_write(PipelineState *ps) {
+	PipelineItem *item = queue_pop(&ps->write_queue);
+	if (!item) return;
+
+	if (!imgio_save(item->output_path, &item->dst)) {
+		fprintf(stderr, "failed to write '%s'\n", item->output_path);
+	}
+
+	item_free(item);
+
+	pthread_mutex_lock(&ps->write_mutex);
+	ps->files_written++;
+	pthread_mutex_unlock(&ps->write_mutex);
+}
+
+static void apply_requested_role(Worker *w) {
+	pthread_mutex_lock(&w->role_mutex);
+	WorkerRole req = w->requested_role;
+	pthread_mutex_unlock(&w->role_mutex);
+
+	if ((int)req != -1 && req != w->role) {
+		w->role = req;
+		pthread_mutex_lock(&w->role_mutex);
+		w->requested_role = (WorkerRole)-1;
+		pthread_mutex_unlock(&w->role_mutex);
+	}
+}
+
+static void *worker_thread(void *arg) {
+	Worker *w = arg;
+	PipelineState *ps = w->state;
+
+	while (atomic_load(&w->running)) {
+		apply_requested_role(w);
+
+		switch (w->role) {
+		case ROLE_READER: {
+			pthread_mutex_lock(&ps->read_mutex);
+			int has_work = (ps->read_cursor < ps->file_count);
+			pthread_mutex_unlock(&ps->read_mutex);
+			if (has_work) {
+				do_read(ps);
+			} else {
+				msleep(5);
+			}
+			break;
+		}
+		case ROLE_CONVOLVER:
+			do_convolve(ps);
+			break;
+		case ROLE_WRITER:
+			do_write(ps);
+			break;
+		}
+	}
+	return NULL;
+}
+
+static size_t count_role(Worker *workers, size_t n, WorkerRole role) {
+	size_t c = 0;
+	for (size_t i = 0; i < n; i++) {
+		pthread_mutex_lock(&workers[i].role_mutex);
+		if (workers[i].role == role) {
+			c++;
+		}
+		pthread_mutex_unlock(&workers[i].role_mutex);
+	}
+	return c;
+}
+
+static int reassign(Worker *workers, size_t n, WorkerRole from, WorkerRole to) {
+	if (count_role(workers, n, from) <= 1) return 0;
+	for (size_t i = 0; i < n; i++) {
+		pthread_mutex_lock(&workers[i].role_mutex);
+		if (workers[i].role == from) {
+			workers[i].requested_role = to;
+			pthread_mutex_unlock(&workers[i].role_mutex);
+			return 1;
+		}
+		pthread_mutex_unlock(&workers[i].role_mutex);
+	}
+	return 0;
+}
+
+static void *dispatcher_thread(void *arg) {
+	Dispatcher *d = arg;
+	PipelineState *ps = d->state;
+	const int interval_ms = 150;
+
+	while (atomic_load(&d->running)) {
+		msleep(interval_ms);
+
+		size_t conv_count = queue_size(&ps->conv_queue);
+		size_t conv_cap = ps->conv_queue.capacity;
+		size_t write_count = queue_size(&ps->write_queue);
+		size_t write_cap = ps->write_queue.capacity;
+
+		pthread_mutex_lock(&ps->read_mutex);
+		int reading_done = (ps->read_cursor >= ps->file_count);
+		pthread_mutex_unlock(&ps->read_mutex);
+
+		if (conv_count >= conv_cap * 3 / 4) {
+			if (!reassign(d->workers, d->n_workers, ROLE_READER, ROLE_CONVOLVER))
+				reassign(d->workers, d->n_workers, ROLE_WRITER, ROLE_CONVOLVER);
+		} else if (write_count >= write_cap * 3 / 4) {
+			if (!reassign(d->workers, d->n_workers, ROLE_CONVOLVER, ROLE_WRITER))
+				reassign(d->workers, d->n_workers, ROLE_READER, ROLE_WRITER);
+		} else if (reading_done && conv_count > 0) {
+			reassign(d->workers, d->n_workers, ROLE_READER, ROLE_CONVOLVER);
+		} else if (conv_count > 0 && write_count == 0) {
+			reassign(d->workers, d->n_workers, ROLE_WRITER, ROLE_CONVOLVER);
+		}
+	}
+	return NULL;
+}
+
+void pipeline_run(char **input_paths, char **output_paths, size_t count,
+				  const struct Filter *filter, ParallelStrategy strategy, size_t n_workers) {
+	if (count == 0 || n_workers <= 0) return;
+
+	if (n_workers < 3) {
+		fprintf(stderr, "Warning: n_workers=%zu is too small, replacement by 3 completed\n",
+				n_workers);
+		n_workers = 3;
+	}
+
+	PipelineState ps = {0};
+	ps.filter = filter;
+	ps.input_paths = input_paths;
+	ps.output_paths = output_paths;
+	ps.file_count = count;
+	ps.strategy = strategy;
+
+	queue_init(&ps.conv_queue, QUEUE_RAW_CAP);
+	queue_init(&ps.write_queue, QUEUE_CONV_CAP);
+	pthread_mutex_init(&ps.read_mutex, NULL);
+	pthread_mutex_init(&ps.write_mutex, NULL);
+
+	Worker *workers = calloc(n_workers, sizeof(Worker));
+	if (!workers) {
+		fprintf(stderr, "Error: failed to allocate workers\n");
+		queue_free(&ps.conv_queue);
+		queue_free(&ps.write_queue);
+		pthread_mutex_destroy(&ps.read_mutex);
+		pthread_mutex_destroy(&ps.write_mutex);
+		return;
+	}
+	for (size_t i = 0; i < n_workers; i++) {
+		workers[i].state = &ps;
+		workers[i].running = 1;
+		workers[i].requested_role = (WorkerRole)-1;
+		pthread_mutex_init(&workers[i].role_mutex, NULL);
+
+		if (i == 0) {
+			workers[i].role = ROLE_READER;
+		} else if (i == n_workers - 1) {
+			workers[i].role = ROLE_WRITER;
+		} else {
+			workers[i].role = ROLE_CONVOLVER;
+		}
+	}
+
+	Dispatcher disp = {.workers = workers, .n_workers = n_workers, .state = &ps};
+	atomic_store(&disp.running, 1);
+	if (pthread_create(&disp.thread, NULL, dispatcher_thread, &disp) != 0) {
+		fprintf(stderr, "Error: failed to create dispatcher thread\n");
+		free(workers);
+		queue_free(&ps.conv_queue);
+		queue_free(&ps.write_queue);
+		pthread_mutex_destroy(&ps.read_mutex);
+		pthread_mutex_destroy(&ps.write_mutex);
+		return;
+	}
+	for (size_t i = 0; i < n_workers; i++) {
+		pthread_create(&workers[i].thread, NULL, worker_thread, &workers[i]);
+	}
+
+	while (1) {
+		pthread_mutex_lock(&ps.write_mutex);
+		size_t done = ps.files_written;
+		pthread_mutex_unlock(&ps.write_mutex);
+		if (done >= count) break;
+		msleep(10);
+	}
+
+	queue_stop(&ps.conv_queue);
+	queue_stop(&ps.write_queue);
+	for (size_t i = 0; i < n_workers; i++) {
+		atomic_store(&workers[i].running, 0);
+	}
+	for (size_t i = 0; i < n_workers; i++) {
+		pthread_join(workers[i].thread, NULL);
+	}
+
+	atomic_store(&disp.running, 0);
+	pthread_join(disp.thread, NULL);
+
+	for (size_t i = 0; i < n_workers; i++) {
+		pthread_mutex_destroy(&workers[i].role_mutex);
+	}
+	free(workers);
+	queue_free(&ps.conv_queue);
+	queue_free(&ps.write_queue);
+	pthread_mutex_destroy(&ps.read_mutex);
+	pthread_mutex_destroy(&ps.write_mutex);
+
+	fprintf(stderr, "done: %zu/%zu\n", ps.files_written, count);
+}
diff --git a/src/lib/queue.c b/src/lib/queue.c
new file mode 100644
index 0000000..2ecf8cb
--- /dev/null
+++ b/src/lib/queue.c
@@ -0,0 +1,71 @@
+#include "queue.h"
+#include <stdlib.h>
+
+int queue_init(Queue *queue, size_t capacity) {
+	queue->ring_buffer = malloc(capacity * sizeof(void *));
+	if (!queue->ring_buffer) {
+		return -1;
+	}
+	queue->capacity = capacity;
+	queue->head = 0;
+	queue->tail = 0;
+	queue->count = 0;
+	queue->done = 0;
+	pthread_mutex_init(&queue->mutex, NULL);
+	pthread_cond_init(&queue->not_full, NULL);
+	pthread_cond_init(&queue->not_empty, NULL);
+	return 0;
+}
+
+void queue_free(Queue *queue) {
+	free(queue->ring_buffer);
+	pthread_cond_destroy(&queue->not_empty);
+	pthread_cond_destroy(&queue->not_full);
+	pthread_mutex_destroy(&queue->mutex);
+}
+
+void queue_push(Queue *queue, void *item) {
+	pthread_mutex_lock(&queue->mutex);
+	while (queue->count == queue->capacity && !queue->done) {
+		pthread_cond_wait(&queue->not_full, &queue->mutex);
+	}
+	if (!queue->done) {
+		queue->ring_buffer[queue->tail] = item;
+		queue->tail = (queue->tail + 1) % queue->capacity;
+		queue->count++;
+		pthread_cond_signal(&queue->not_empty);
+	}
+	pthread_mutex_unlock(&queue->mutex);
+}
+
+void *queue_pop(Queue *queue) {
+	pthread_mutex_lock(&queue->mutex);
+	while (queue->count == 0 && !queue->done) {
+		pthread_cond_wait(&queue->not_empty, &queue->mutex);
+	}
+	if (queue->count == 0) {
+		pthread_mutex_unlock(&queue->mutex);
+		return NULL;
+	}
+	void *item = queue->ring_buffer[queue->head];
+	queue->head = (queue->head + 1) % queue->capacity;
+	queue->count--;
+	pthread_cond_signal(&queue->not_full);
+	pthread_mutex_unlock(&queue->mutex);
+	return item;
+}
+
+void queue_stop(Queue *queue) {
+	pthread_mutex_lock(&queue->mutex);
+	queue->done = 1;
+	pthread_cond_broadcast(&queue->not_empty);
+	pthread_cond_broadcast(&queue->not_full);
+	pthread_mutex_unlock(&queue->mutex);
+}
+
+size_t queue_size(Queue *queue) {
+	pthread_mutex_lock(&queue->mutex);
+	size_t count = queue->count;
+	pthread_mutex_unlock(&queue->mutex);
+	return count;
+}
diff --git a/src/main.c b/src/main.c
index e69de29..db6e4d2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -0,0 +1,117 @@
+#include "cli.h"
+#include "conv.h"
+#include "filters.h"
+#include "imgio.h"
+#include "pipeline.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static const char *strategy_name(ParallelStrategy s) {
+	switch (s) {
+	case STRATEGY_BY_ROWS:
+		return "rows";
+	case STRATEGY_BY_COLS:
+		return "cols";
+	case STRATEGY_PER_PIXEL:
+		return "pixels";
+	case STRATEGY_TILES:
+		return "tiles";
+	default:
+		return "sequential";
+	}
+}
+
+static const struct Filter *find_filter(const char *name, struct Filter *out) {
+	for (size_t i = 0; i < filter_count; ++i) {
+		if (strcmp(name, filter_list[i].name) == 0) {
+			*out = filter_list[i].create();
+			return out;
+		}
+	}
+	return NULL;
+}
+
+static int run_single(const CliConfig *cfg) {
+	struct Filter filter;
+	if (!find_filter(cfg->filter_name, &filter)) {
+		fprintf(stderr, "Error: unknown filter '%s'\nAvailable:", cfg->filter_name);
+		for (size_t i = 0; i < filter_count; ++i) {
+			fprintf(stderr, " %s", filter_list[i].name);
+		}
+		fprintf(stderr, "\n");
+		return 1;
+	}
+
+	Image src;
+	if (!imgio_load(cfg->input_path, &src)) {
+		fprintf(stderr, "Error: failed to load '%s'\n", cfg->input_path);
+		return 1;
+	}
+
+	Image dst = {
+		.pixels = malloc(src.width * src.height * (size_t)src.channels),
+		.width = src.width,
+		.height = src.height,
+		.channels = src.channels,
+	};
+	if (!dst.pixels) {
+		fprintf(stderr, "Error: out of memory\n");
+		imgio_free(&src);
+		return 1;
+	}
+
+	convolve_parallel(&src, &dst, &filter, cfg->strategy);
+
+	if (!imgio_save(cfg->output_path, &dst)) {
+		fprintf(stderr, "Error: failed to save '%s'\n", cfg->output_path);
+		free(dst.pixels);
+		imgio_free(&src);
+		return 1;
+	}
+
+	printf("Done  input=%s  output=%s  filter=%s (size=%zu)  strategy=%s\n", cfg->input_path,
+		   cfg->output_path, cfg->filter_name, filter.size, strategy_name(cfg->strategy));
+
+	free(dst.pixels);
+	imgio_free(&src);
+	return 0;
+}
+
+static int run_pipeline(CliPipelineConfig *cfg) {
+	struct Filter filter;
+	if (!find_filter(cfg->filter_name, &filter)) {
+		fprintf(stderr, "Error: unknown filter '%s'\nAvailable:", cfg->filter_name);
+		for (size_t i = 0; i < filter_count; ++i) {
+			fprintf(stderr, " %s", filter_list[i].name);
+		}
+		fprintf(stderr, "\n");
+		free(cfg->input_paths);
+		free(cfg->output_paths);
+		return 1;
+	}
+
+	printf("Pipeline  files=%zu  workers=%zu  filter=%s  strategy=%s\n", cfg->file_count,
+		   cfg->n_workers, cfg->filter_name, strategy_name(cfg->strategy));
+
+	pipeline_run(cfg->input_paths, cfg->output_paths, cfg->file_count, &filter, cfg->strategy,
+				 cfg->n_workers);
+
+	free(cfg->input_paths);
+	free(cfg->output_paths);
+	return 0;
+}
+
+int main(int argc, char *argv[]) {
+	CliArgs args;
+	if (!cli_parse(argc, argv, &args)) {
+		return 1;
+	}
+
+	if (args.mode == CLI_MODE_PIPELINE) {
+		return run_pipeline(&args.pipeline);
+	} else {
+		return run_single(&args.single);
+	}
+}
diff --git a/tests/test_conv.c b/tests/test_conv.c
new file mode 100644
index 0000000..bb154b6
--- /dev/null
+++ b/tests/test_conv.c
@@ -0,0 +1,335 @@
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <cmocka.h>
+
+#include "conv.h"
+#include "filters.h"
+#include "imgio.h"
+#include "pipeline.h"
+#include "stb_image.h"
+
+static Image *make_img(size_t w, size_t h, int ch, uint8_t fill) {
+	Image *img = malloc(sizeof(Image));
+	img->width = w;
+	img->height = h;
+	img->channels = ch;
+	img->pixels = malloc(w * h * ch);
+	memset(img->pixels, fill, w * h * ch);
+	return img;
+}
+
+static Image *rand_img(size_t w, size_t h, int ch, unsigned seed) {
+	Image *img = make_img(w, h, ch, 0);
+	srand(seed);
+	for (size_t i = 0; i < w * h * ch; i++) img->pixels[i] = (uint8_t)rand();
+	return img;
+}
+
+static void free_img(Image *img) {
+	if (img) {
+		free(img->pixels);
+		free(img);
+	}
+}
+
+static bool img_equal(const Image *a, const Image *b) {
+	if (!a || !b || a->width != b->width || a->height != b->height || a->channels != b->channels)
+		return false;
+	return memcmp(a->pixels, b->pixels, a->width * a->height * a->channels) == 0;
+}
+
+static struct Filter compose_filters(const struct Filter *a, const struct Filter *b) {
+	size_t new_sz = a->size + b->size - 1;
+	double *data = calloc(new_sz * new_sz, sizeof(double));
+	for (size_t ay = 0; ay < a->size; ay++)
+		for (size_t ax = 0; ax < a->size; ax++)
+			for (size_t by = 0; by < b->size; by++)
+				for (size_t bx = 0; bx < b->size; bx++)
+					data[(ay + by) * new_sz + (ax + bx)] +=
+						a->data[ay * a->size + ax] * b->data[by * b->size + bx];
+	return (struct Filter){new_sz, data, a->factor * b->factor, 0.0};
+}
+
+static struct Filter pad_filter(const struct Filter *src, size_t new_sz) {
+	double *data = calloc(new_sz * new_sz, sizeof(double));
+	size_t off = (new_sz - src->size) / 2;
+	for (size_t y = 0; y < src->size; y++)
+		for (size_t x = 0; x < src->size; x++)
+			data[(y + off) * new_sz + (x + off)] = src->data[y * src->size + x];
+	return (struct Filter){new_sz, data, src->factor, src->bias};
+}
+
+static void test_tiny_manual_calc(void **state) {
+	(void)state;
+
+	uint8_t input[] = {10, 20, 30, 40, 50, 60, 70, 80, 90};
+	uint8_t expected_left[] = {20, 30, 10, 50, 60, 40, 80, 90, 70};
+	double kernel_shift_left[9] = {0, 0, 0, 0, 0, 1, 0, 0, 0};
+	struct Filter f_left = {.size = 3, .data = kernel_shift_left, .factor = 1.0, .bias = 0.0};
+
+	Image src = {.pixels = input, .width = 3, .height = 3, .channels = 1};
+	uint8_t out[9];
+	Image dst = {.pixels = out, .width = 3, .height = 3, .channels = 1};
+
+	convolve_sequential(&src, &dst, &f_left);
+	assert_memory_equal(out, expected_left, 9);
+
+	uint8_t expected_right[] = {30, 10, 20, 60, 40, 50, 90, 70, 80};
+	double kernel_shift_right[9] = {0, 0, 0, 1, 0, 0, 0, 0, 0};
+	struct Filter f_right = {.size = 3, .data = kernel_shift_right, .factor = 1.0, .bias = 0.0};
+
+	convolve_sequential(&src, &dst, &f_right);
+	assert_memory_equal(out, expected_right, 9);
+}
+
+static void test_property_identity(void **state) {
+	(void)state;
+	Image *src = rand_img(128, 96, 3, 42);
+	Image *dst = make_img(128, 96, 3, 0);
+	struct Filter id = filter_identity();
+	convolve_sequential(src, dst, &id);
+	assert_true(img_equal(src, dst));
+	free_img(src);
+	free_img(dst);
+}
+
+static void test_property_zero_factor(void **state) {
+	(void)state;
+	Image *src = rand_img(64, 64, 3, 123);
+	Image *dst = make_img(64, 64, 3, 255);
+	double dummy[9] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+	struct Filter f = {.size = 3, .data = dummy, .factor = 0.0, .bias = 0.0};
+	convolve_sequential(src, dst, &f);
+	for (size_t i = 0; i < dst->width * dst->height * dst->channels; i++)
+		assert_int_equal(dst->pixels[i], 0);
+	free_img(src);
+	free_img(dst);
+}
+
+static void test_property_composition(void **state) {
+	(void)state;
+
+	double sl_data[9] = {0, 0, 0, 0, 0, 1, 0, 0, 0};
+	double sr_data[9] = {0, 0, 0, 1, 0, 0, 0, 0, 0};
+
+	struct Filter shift_left = {.size = 3, .data = sl_data, .factor = 1.0, .bias = 0.0};
+	struct Filter shift_right = {.size = 3, .data = sr_data, .factor = 1.0, .bias = 0.0};
+
+	struct Filter comp_ll = compose_filters(&shift_left, &shift_left);
+	struct Filter comp_rl = compose_filters(&shift_right, &shift_left);
+
+	Image *src = rand_img(80, 60, 3, 777);
+
+	Image *tmp = make_img(80, 60, 3, 0);
+	Image *two_sl = make_img(80, 60, 3, 0);
+	Image *one_ll = make_img(80, 60, 3, 0);
+
+	convolve_sequential(src, tmp, &shift_left);
+	convolve_sequential(tmp, two_sl, &shift_left);
+	convolve_sequential(src, one_ll, &comp_ll);
+	assert_true(img_equal(two_sl, one_ll));
+
+	Image *two_rl = make_img(80, 60, 3, 0);
+	Image *one_id = make_img(80, 60, 3, 0);
+
+	convolve_sequential(src, tmp, &shift_left);
+	convolve_sequential(tmp, two_rl, &shift_right);
+	convolve_sequential(src, one_id, &comp_rl);
+	assert_true(img_equal(two_rl, one_id));
+	assert_true(img_equal(two_rl, src));
+
+	free(comp_ll.data);
+	free(comp_rl.data);
+	free_img(src);
+	free_img(tmp);
+	free_img(two_sl);
+	free_img(one_ll);
+	free_img(two_rl);
+	free_img(one_id);
+}
+
+static void test_property_shift_inverse(void **state) {
+	(void)state;
+	double right[9] = {0, 0, 0, 0, 0, 1, 0, 0, 0};
+	double left[9] = {0, 0, 0, 1, 0, 0, 0, 0, 0};
+	struct Filter sr = {.size = 3, .data = right, .factor = 1.0, .bias = 0.0};
+	struct Filter sl = {.size = 3, .data = left, .factor = 1.0, .bias = 0.0};
+
+	Image *src = rand_img(32, 32, 3, 999);
+	Image *tmp = make_img(32, 32, 3, 0);
+	Image *res = make_img(32, 32, 3, 0);
+
+	convolve_sequential(src, tmp, &sr);
+	convolve_sequential(tmp, res, &sl);
+	assert_true(img_equal(src, res));
+
+	free_img(src);
+	free_img(tmp);
+	free_img(res);
+}
+
+static void test_property_zero_padding(void **state) {
+	(void)state;
+	struct Filter f3 = filter_blur();
+	struct Filter f5 = pad_filter(&f3, 5);
+
+	Image *src = rand_img(50, 40, 3, 4242);
+	Image *dst3 = make_img(50, 40, 3, 0);
+	Image *dst5 = make_img(50, 40, 3, 0);
+
+	convolve_sequential(src, dst3, &f3);
+	convolve_sequential(src, dst5, &f5);
+	assert_true(img_equal(dst3, dst5));
+
+	free(f5.data);
+	free_img(src);
+	free_img(dst3);
+	free_img(dst5);
+}
+
+static void test_property_various_sizes(void **state) {
+	(void)state;
+
+	const size_t widths[] = {1, 2, 3, 7, 15, 16, 17, 63, 64, 65, 100, 256};
+	const size_t heights[] = {1, 2, 3, 7, 15, 16, 17, 63, 64, 65, 100, 200};
+	const size_t n = sizeof(widths) / sizeof(widths[0]);
+
+	for (size_t i = 0; i < n; i++) {
+		size_t w = widths[i], h = heights[i];
+		Image *src = rand_img(w, h, 3, (unsigned)(i * 1234 + 5678));
+		Image *dst = make_img(w, h, 3, 0);
+		struct Filter id = filter_identity();
+		convolve_sequential(src, dst, &id);
+		assert_true(img_equal(src, dst));
+		free_img(src);
+		free_img(dst);
+	}
+}
+
+static void test_parallel_vs_sequential(void **state) {
+	(void)state;
+	srand((unsigned)time(NULL));
+	size_t idx = rand() % filter_count;
+	struct Filter f = filter_list[idx].create();
+
+	size_t w = 100 + (rand() % 300);
+	size_t h = 80 + (rand() % 300);
+	Image *src = rand_img(w, h, 3, (unsigned)time(NULL));
+	Image *ref = make_img(w, h, 3, 0);
+
+	convolve_sequential(src, ref, &f);
+
+	ParallelStrategy strategies[] = {STRATEGY_PER_PIXEL, STRATEGY_BY_ROWS, STRATEGY_BY_COLS,
+									 STRATEGY_TILES};
+
+	for (int i = 0; i < 4; i++) {
+		Image *dst = make_img(w, h, 3, 0);
+		convolve_parallel(src, dst, &f, strategies[i]);
+		assert_true(img_equal(ref, dst));
+		free_img(dst);
+	}
+
+	free_img(src);
+	free_img(ref);
+}
+
+static void test_parallel_all_filters_deterministic(void **state) {
+	(void)state;
+	ParallelStrategy strategies[] = {STRATEGY_PER_PIXEL, STRATEGY_BY_ROWS, STRATEGY_BY_COLS,
+									 STRATEGY_TILES};
+
+	for (size_t fi = 0; fi < filter_count; fi++) {
+		struct Filter f = filter_list[fi].create();
+		Image *src = rand_img(64, 48, 3, (unsigned)(fi * 31 + 17));
+		Image *ref = make_img(64, 48, 3, 0);
+		convolve_sequential(src, ref, &f);
+
+		for (int si = 0; si < 4; si++) {
+			Image *dst = make_img(64, 48, 3, 0);
+			convolve_parallel(src, dst, &f, strategies[si]);
+			if (!img_equal(ref, dst)) {
+				fprintf(stderr, "FAIL: filter '%s', strategy %d\n", filter_list[fi].name,
+						strategies[si]);
+			}
+			assert_true(img_equal(ref, dst));
+			free_img(dst);
+		}
+		free_img(src);
+		free_img(ref);
+	}
+}
+
+static void test_pipeline_correctness(void **state) {
+	(void)state;
+
+	const size_t n_files = 5;
+	const size_t worker_counts[] = {3, 4, 8};
+	const size_t n_workers_tests = sizeof(worker_counts) / sizeof(worker_counts[0]);
+
+	struct Filter filter = filter_gaussian5();
+	ParallelStrategy strategy = STRATEGY_BY_ROWS;
+
+	char *in_paths[n_files];
+	char *out_paths[n_files];
+	Image *refs[n_files];
+
+	for (size_t i = 0; i < n_files; i++) {
+		Image *src = rand_img(64 + i * 16, 48 + i * 16, 3, (unsigned)(i * 777 + 13));
+		Image *ref = make_img(src->width, src->height, src->channels, 0);
+		convolve_sequential(src, ref, &filter);
+		refs[i] = ref;
+		char buf[64];
+		snprintf(buf, sizeof(buf), "/tmp/pipeline_test_in_%zu.bmp", i);
+		in_paths[i] = malloc(strlen(buf) + 1);
+		if (in_paths[i]) strcpy(in_paths[i], buf);
+
+		imgio_save(in_paths[i], src);
+
+		snprintf(buf, sizeof(buf), "/tmp/pipeline_test_out_%zu.bmp", i);
+		out_paths[i] = malloc(strlen(buf) + 1);
+		if (out_paths[i]) strcpy(out_paths[i], buf);
+		free_img(src);
+	}
+
+	for (size_t w = 0; w < n_workers_tests; w++) {
+		fprintf(stderr, "[TEST] Pipeline correctness with %zu workers...\n", worker_counts[w]);
+
+		pipeline_run(in_paths, out_paths, n_files, &filter, strategy, worker_counts[w]);
+
+		for (size_t i = 0; i < n_files; i++) {
+			Image *out = make_img(refs[i]->width, refs[i]->height, refs[i]->channels, 0);
+			assert_true(imgio_load(out_paths[i], out));
+			assert_true(img_equal(refs[i], out));
+			free_img(out);
+		}
+	}
+	for (size_t i = 0; i < n_files; i++) {
+		unlink(in_paths[i]);
+		unlink(out_paths[i]);
+		free(in_paths[i]);
+		free(out_paths[i]);
+		free_img(refs[i]);
+	}
+}
+
+int main(void) {
+	const struct CMUnitTest tests[] = {cmocka_unit_test(test_tiny_manual_calc),
+									   cmocka_unit_test(test_property_identity),
+									   cmocka_unit_test(test_property_zero_factor),
+									   cmocka_unit_test(test_property_composition),
+									   cmocka_unit_test(test_property_shift_inverse),
+									   cmocka_unit_test(test_property_zero_padding),
+									   cmocka_unit_test(test_property_various_sizes),
+									   cmocka_unit_test(test_parallel_vs_sequential),
+									   cmocka_unit_test(test_parallel_all_filters_deterministic),
+									   cmocka_unit_test(test_pipeline_correctness)};
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}
diff --git a/third_party/stb/stb_image.h b/third_party/stb/stb_image.h
new file mode 100644
index 0000000..5c02139
--- /dev/null
+++ b/third_party/stb/stb_image.h
@@ -0,0 +1,8147 @@
+/* stb_image - v2.30 - public domain image loader - http://nothings.org/stb
+								  no warranty implied; use at your own risk
+
+   Do this:
+	  #define STB_IMAGE_IMPLEMENTATION
+   before you include this file in *one* C or C++ file to create the
+implementation.
+
+   // i.e. it should look like this:
+   #include ...
+   #include ...
+   #include ...
+   #define STB_IMAGE_IMPLEMENTATION
+   #include "stb_image.h"
+
+   You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
+   And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using
+malloc,realloc,free
+
+
+   QUICK NOTES:
+	  Primarily of interest to game developers and other people who can
+		  avoid problematic images and only need the trivial interface
+
+	  JPEG baseline & progressive (12 bpc/arithmetic not supported, same as
+stock IJG lib) PNG 1/2/4/8/16-bit-per-channel
+
+	  TGA (not sure what subset, if a subset)
+	  BMP non-1bpp, non-RLE
+	  PSD (composited view only, no extra channels, 8/16 bit-per-channel)
+
+	  GIF (*comp always reports as 4-channel)
+	  HDR (radiance rgbE format)
+	  PIC (Softimage PIC)
+	  PNM (PPM and PGM binary only)
+
+	  Animated GIF still needs a proper API, but here's one way to do it:
+		  http://gist.github.com/urraka/685d9a6340b26b830d49
+
+	  - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+	  - decode from arbitrary I/O callbacks
+	  - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
+
+   Full documentation under "DOCUMENTATION" below.
+
+
+LICENSE
+
+  See end of file for license information.
+
+RECENT REVISION HISTORY:
+
+	  2.30  (2024-05-31) avoid erroneous gcc warning
+	  2.29  (2023-05-xx) optimizations
+	  2.28  (2023-01-29) many error fixes, security errors, just tons of stuff
+	  2.27  (2021-07-11) document stbi_info better, 16-bit PNM support, bug
+fixes 2.26  (2020-07-13) many minor fixes 2.25  (2020-02-02) fix warnings 2.24
+(2020-02-02) fix warnings; thread-local failure_reason and flip_vertically 2.23
+(2019-08-11) fix clang static analysis warning 2.22  (2019-03-04) gif fixes, fix
+warnings 2.21  (2019-02-25) fix typo in comment 2.20  (2019-02-07) support utf8
+filenames in Windows; fix warnings and platform ifdefs 2.19  (2018-02-11) fix
+warning 2.18  (2018-01-30) fix warnings 2.17  (2018-01-29) bugfix, 1-bit BMP,
+16-bitness query, fix warnings 2.16  (2017-07-23) all functions have 16-bit
+variants; optimizations; bugfixes 2.15  (2017-03-18) fix png-1,2,4; all Imagenet
+JPGs; no runtime SSE detection on GCC 2.14  (2017-03-03) remove deprecated
+STBI_JPEG_OLD; fixes for Imagenet JPGs 2.13  (2016-12-04) experimental 16-bit
+API, only for PNG so far; fixes 2.12  (2016-04-02) fix typo in 2.11 PSD fix that
+caused crashes 2.11  (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64
+						 RGB-format JPEG; remove white matting in PSD;
+						 allocate large structures on the stack;
+						 correct channel count for PNG & BMP
+	  2.10  (2016-01-22) avoid warning introduced in 2.09
+	  2.09  (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+
+   See end of file for full revision history.
+
+
+ ============================    Contributors    =========================
+
+ Image formats                          Extensions, features
+	Sean Barrett (jpeg, png, bmp)          Jetro Lauha (stbi_info)
+	Nicolas Schulz (hdr, psd)              Martin "SpartanJ" Golini (stbi_info)
+	Jonathan Dummer (tga)                  James "moose2000" Brown (iPhone PNG)
+	Jean-Marc Lienher (gif)                Ben "Disch" Wenger (io callbacks)
+	Tom Seddon (pic)                       Omar Cornut (1/2/4-bit PNG)
+	Thatcher Ulrich (psd)                  Nicolas Guillemot (vertical flip)
+	Ken Miller (pgm, ppm)                  Richard Mitton (16-bit PSD)
+	github:urraka (animated gif)           Junggon Kim (PNM comments)
+	Christopher Forseth (animated gif)     Daniel Gibson (16-bit TGA)
+										   socks-the-fox (16-bit PNG)
+										   Jeremy Sawicki (handle all ImageNet
+JPGs) Optimizations & bugfixes                  Mikhail Morozov (1-bit BMP)
+	Fabian "ryg" Giesen                    Anael Seghezzi (is-16-bit query)
+	Arseny Kapoulkine                      Simon Breuss (16-bit PNM)
+	John-Mark Allen
+	Carmelo J Fdez-Aguera
+
+ Bug & warning fixes
+	Marc LeBlanc            David Woo          Guillaume George     Martins
+Mozeiko Christpher Lloyd        Jerry Jansson      Joseph Thomson       Blazej
+Dariusz Roszkowski Phil Jordan                                Dave Moore Roy
+Eltham Hayaki Saito            Nathan Reed        Won Chun Luke Graham Johan
+Duparc       Nick Verigakis       the Horde3D community Thomas Ruf Ronny
+Chevalier                         github:rlyeh Janez Zemva             John
+Bartholomew   Michal Cichon        github:romigrou Jonathan Blow           Ken
+Hamada         Tero Hanninen        github:svdijk Eugene Golushkov Laurent
+Gomila     Cort Stratton        github:snagar Aruelien Pocheville     Sergio
+Gonzalez    Thibault Reuille     github:Zelex Cass Everitt            Ryamond
+Barbiero                        github:grim210 Paul Du Bois            Engin
+Manap        Aldo Culquicondor    github:sammyhw Philipp Wiesemann       Dale
+Weiler        Oriol Ferrer Mesia   github:phprus Josh Tobin              Neil
+Bickford      Matthew Gregan       github:poppolopoppo Julian Raschke Gregory
+Mullen     Christian Floisand   github:darealshinji Baldur Karlsson Kevin
+Schmidt      JR Smith             github:Michaelangel007 Brad Weinberger Matvey
+Cherevko      github:mosra Luca Sas                Alexander Veselov  Zack
+Middleton       [reserved] Ryan C. Gordon          [reserved] [reserved] DO NOT
+ADD YOUR NAME HERE
+
+					 Jacko Dirks
+
+  To add your name to the credits, pick a random blank space in the middle and
+fill it. 80% of merge conflicts on stb PRs are due to people adding their name
+at the end of the credits.
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// DOCUMENTATION
+//
+// Limitations:
+//    - no 12-bit-per-channel JPEG
+//    - no JPEGs with arithmetic coding
+//    - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below for HDR usage):
+//    int x,y,n;
+//    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+//    // ... process data if not NULL ...
+//    // ... x = width, y = height, n = # 8-bit components per pixel ...
+//    // ... replace '0' with '1'..'4' to force that many components per pixel
+//    // ... but 'n' will always be the number that it would have been if you
+//    said 0 stbi_image_free(data);
+//
+// Standard parameters:
+//    int *x                 -- outputs image width in pixels
+//    int *y                 -- outputs image height in pixels
+//    int *channels_in_file  -- outputs # of image components in image file
+//    int desired_channels   -- if non-zero, # of image components requested in
+//    result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data, or NULL on an allocation failure or if the image is
+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'desired_channels' if desired_channels is non-zero, or
+// *channels_in_file otherwise. If desired_channels is non-zero,
+// *channels_in_file has the number of components that _would_ have been
+// output otherwise. E.g. if you set desired_channels to 4, you will always
+// get RGBA output, but you can check *channels_in_file to see if it's trivially
+// opaque because e.g. there were only 3 channels in the source image.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+//     N=#comp     components
+//       1           grey
+//       2           grey, alpha
+//       3           red, green, blue
+//       4           red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *channels_in_file will be unchanged. The function
+// stbi_failure_reason() can be queried for an extremely brief, end-user
+// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS
+// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get
+// slightly more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// To query the width, height and component count of an image without having to
+// decode the full file, you can use the stbi_info family of functions:
+//
+//   int x,y,n,ok;
+//   ok = stbi_info(filename, &x, &y, &n);
+//   // returns ok=1 and sets x, y, n if image is a supported format,
+//   // 0 otherwise.
+//
+// Note that stb_image pervasively uses ints in its public API for sizes,
+// including sizes of memory buffers. This is now part of the API and thus
+// hard to change without causing breakage. As a result, the various image
+// loaders all have certain limits on image size; these differ somewhat
+// by format but generally boil down to either just under 2GB or just under
+// 1GB. When the decoded image would be larger than this, stb_image decoding
+// will fail.
+//
+// Additionally, stb_image will reject image files that have any of their
+// dimensions set to a larger value than the configurable STBI_MAX_DIMENSIONS,
+// which defaults to 2**24 = 16777216 pixels. Due to the above memory limit,
+// the only way to have an image with such dimensions load correctly
+// is for it to have a rather extreme aspect ratio. Either way, the
+// assumption here is that such larger images are likely to be malformed
+// or malicious. If you do need to load an image with individual dimensions
+// larger than that, and it still fits in the overall size limit, you can
+// #define STBI_MAX_DIMENSIONS on your own to be something larger.
+//
+// ===========================================================================
+//
+// UNICODE:
+//
+//   If compiling for Windows and you wish to use Unicode filenames, compile
+//   with
+//       #define STBI_WINDOWS_UTF8
+//   and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert
+//   Windows wchar_t filenames to utf8.
+//
+// ===========================================================================
+//
+// Philosophy
+//
+// stb libraries are designed with the following priorities:
+//
+//    1. easy to use
+//    2. easy to maintain
+//    3. good performance
+//
+// Sometimes I let "good performance" creep up in priority over "easy to
+// maintain", and for best performance I may provide less-easy-to-use APIs that
+// give higher performance, in addition to the easy-to-use ones. Nevertheless,
+// it's important to keep in mind that from the standpoint of you, a client of
+// this library, all you care about is #1 and #3, and stb libraries DO NOT
+// emphasize #3 above all.
+//
+// Some secondary priorities arise directly from the first two, some of which
+// provide more explicit reasons why performance can't be emphasized.
+//
+//    - Portable ("ease of use")
+//    - Small source code footprint ("easy to maintain")
+//    - No dependencies ("ease of use")
+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the
+// end).
+//
+// ===========================================================================
+//
+// SIMD support
+//
+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
+// supported by the compiler. For ARM Neon support, you must explicitly
+// request it.
+//
+// (The old do-it-yourself SIMD API is no longer supported in the current
+// code.)
+//
+// On x86, SSE2 will automatically be used when available based on a run-time
+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
+// the typical path is to have separate builds for NEON and non-NEON devices
+// (at least this is true for iOS and Android). Therefore, the NEON support is
+// toggled by a build flag: define STBI_NEON to get NEON loops.
+//
+// If for some reason you do not want to use any of SIMD code, or if
+// you have issues compiling it, you can disable it entirely by
+// defining STBI_NO_SIMD.
+//
+// ===========================================================================
+//
+// HDR image support   (disable by defining STBI_NO_HDR)
+//
+// stb_image supports loading HDR images in general, and currently the Radiance
+// .HDR file format specifically. You can still load any file through the
+// existing interface; if you attempt to load an HDR file, it will be
+// automatically remapped to LDR, assuming gamma 2.2 and an arbitrary scale
+// factor defaulting to 1; both of these constants can be reconfigured through
+// this interface:
+//
+//     stbi_hdr_to_ldr_gamma(2.2f);
+//     stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+//    float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+//     stbi_ldr_to_hdr_scale(1.0f);
+//     stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+//     stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// We optionally support converting iPhone-formatted PNGs (which store
+// premultiplied BGRA) back to RGB, even though they're internally encoded
+// differently. To enable this conversion, call
+// stbi_convert_iphone_png_to_rgb(1).
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+// ===========================================================================
+//
+// ADDITIONAL CONFIGURATION
+//
+//  - You can suppress implementation of any of the decoders to reduce
+//    your code footprint by #defining one or more of the following
+//    symbols before creating the implementation.
+//
+//        STBI_NO_JPEG
+//        STBI_NO_PNG
+//        STBI_NO_BMP
+//        STBI_NO_PSD
+//        STBI_NO_TGA
+//        STBI_NO_GIF
+//        STBI_NO_HDR
+//        STBI_NO_PIC
+//        STBI_NO_PNM   (.ppm and .pgm)
+//
+//  - You can request *only* certain decoders and suppress all other ones
+//    (this will be more forward-compatible, as addition of new decoders
+//    doesn't require you to disable them explicitly):
+//
+//        STBI_ONLY_JPEG
+//        STBI_ONLY_PNG
+//        STBI_ONLY_BMP
+//        STBI_ONLY_PSD
+//        STBI_ONLY_TGA
+//        STBI_ONLY_GIF
+//        STBI_ONLY_HDR
+//        STBI_ONLY_PIC
+//        STBI_ONLY_PNM   (.ppm and .pgm)
+//
+//   - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
+//     want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
+//
+//  - If you define STBI_MAX_DIMENSIONS, stb_image will reject images greater
+//    than that size (in either width or height) without further processing.
+//    This is to let programs in the wild set an upper bound to prevent
+//    denial-of-service attacks on untrusted data, as one could generate a
+//    valid image of gigantic dimensions and force stb_image to allocate a
+//    huge block of memory and spend disproportionate time decoding it. By
+//    default this is set to (1 << 24), which is 16777216, but that's still
+//    very big.
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif // STBI_NO_STDIO
+
+#define STBI_VERSION 1
+
+enum {
+	STBI_default = 0, // only used for desired_channels
+
+	STBI_grey = 1,
+	STBI_grey_alpha = 2,
+	STBI_rgb = 3,
+	STBI_rgb_alpha = 4
+};
+
+#include <stdlib.h>
+typedef unsigned char stbi_uc;
+typedef unsigned short stbi_us;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef STBIDEF
+#ifdef STB_IMAGE_STATIC
+#define STBIDEF static
+#else
+#define STBIDEF extern
+#endif
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+
+//
+// load image by filename, open file, or memory buffer
+//
+
+typedef struct {
+	int (*read)(void *user, char *data,
+				int size);			 // fill 'data' with 'size' bytes.  return number of
+									 // bytes actually read
+	void (*skip)(void *user, int n); // skip the next 'n' bytes, or 'unget' the
+									 // last -n bytes if negative
+	int (*eof)(void *user);			 // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+
+////////////////////////////////////
+//
+// 8-bits-per-channel interface
+//
+
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y,
+									   int *channels_in_file, int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y,
+										  int *channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *channels_in_file,
+						   int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *channels_in_file,
+									 int desired_channels);
+// for stbi_load_from_file, file pointer is left pointing immediately after
+// image
+#endif
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x,
+										   int *y, int *z, int *comp, int req_comp);
+#endif
+
+#ifdef STBI_WINDOWS_UTF8
+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t *input);
+#endif
+
+////////////////////////////////////
+//
+// 16-bits-per-channel interface
+//
+
+STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y,
+										  int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x,
+											 int *y, int *channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *channels_in_file,
+							  int desired_channels);
+STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file,
+										int desired_channels);
+#endif
+
+////////////////////////////////////
+//
+// float-per-channel interface
+//
+#ifndef STBI_NO_LINEAR
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y,
+									  int *channels_in_file, int desired_channels);
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y,
+										 int *channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *channels_in_file,
+						  int desired_channels);
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *channels_in_file,
+									int desired_channels);
+#endif
+#endif
+
+#ifndef STBI_NO_HDR
+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma);
+STBIDEF void stbi_hdr_to_ldr_scale(float scale);
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_LINEAR
+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma);
+STBIDEF void stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_LINEAR
+
+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_is_hdr(char const *filename);
+STBIDEF int stbi_is_hdr_from_file(FILE *f);
+#endif // STBI_NO_STDIO
+
+// get a VERY brief reason for failure
+// on most compilers (and ALL modern mainstream compilers) this is threadsafe
+STBIDEF const char *stbi_failure_reason(void);
+
+// free the loaded image -- this is just free()
+STBIDEF void stbi_image_free(void *retval_from_stbi_load);
+
+// get image dimensions & components without fully decoding
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y,
+									 int *comp);
+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len);
+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp);
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp);
+STBIDEF int stbi_is_16_bit(char const *filename);
+STBIDEF int stbi_is_16_bit_from_file(FILE *f);
+#endif
+
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+
+// flip the image vertically, so the first pixel in the output array is the
+// bottom left
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
+
+// as above, but only applies to images loaded on the thread that calls the
+// function this function is only available if your compiler supports
+// thread-local variables; calling it will fail to link if your compiler doesn't
+STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply);
+STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert);
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip);
+
+// ZLIB client - used by PNG, available for other purposes
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size,
+												int *outlen);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len,
+														   int initial_size, int *outlen,
+														   int parse_header);
+STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer,
+											 int ilen);
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+////   end header file   /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifdef STB_IMAGE_IMPLEMENTATION
+
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) ||                 \
+	defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) ||                  \
+	defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) ||                  \
+	defined(STBI_ONLY_ZLIB)
+#ifndef STBI_ONLY_JPEG
+#define STBI_NO_JPEG
+#endif
+#ifndef STBI_ONLY_PNG
+#define STBI_NO_PNG
+#endif
+#ifndef STBI_ONLY_BMP
+#define STBI_NO_BMP
+#endif
+#ifndef STBI_ONLY_PSD
+#define STBI_NO_PSD
+#endif
+#ifndef STBI_ONLY_TGA
+#define STBI_NO_TGA
+#endif
+#ifndef STBI_ONLY_GIF
+#define STBI_NO_GIF
+#endif
+#ifndef STBI_ONLY_HDR
+#define STBI_NO_HDR
+#endif
+#ifndef STBI_ONLY_PIC
+#define STBI_NO_PIC
+#endif
+#ifndef STBI_ONLY_PNM
+#define STBI_NO_PNM
+#endif
+#endif
+
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#define STBI_NO_ZLIB
+#endif
+
+#include <limits.h>
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+#include <math.h> // ldexp, pow
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef STBI_ASSERT
+#include <assert.h>
+#define STBI_ASSERT(x) assert(x)
+#endif
+
+#ifdef __cplusplus
+#define STBI_EXTERN extern "C"
+#else
+#define STBI_EXTERN extern
+#endif
+
+#ifndef _MSC_VER
+#ifdef __cplusplus
+#define stbi_inline inline
+#else
+#define stbi_inline
+#endif
+#else
+#define stbi_inline __forceinline
+#endif
+
+#ifndef STBI_NO_THREAD_LOCALS
+#if defined(__cplusplus) && __cplusplus >= 201103L
+#define STBI_THREAD_LOCAL thread_local
+#elif defined(__GNUC__) && __GNUC__ < 5
+#define STBI_THREAD_LOCAL __thread
+#elif defined(_MSC_VER)
+#define STBI_THREAD_LOCAL __declspec(thread)
+#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__)
+#define STBI_THREAD_LOCAL _Thread_local
+#endif
+
+#ifndef STBI_THREAD_LOCAL
+#if defined(__GNUC__)
+#define STBI_THREAD_LOCAL __thread
+#endif
+#endif
+#endif
+
+#if defined(_MSC_VER) || defined(__SYMBIAN32__)
+typedef unsigned short stbi__uint16;
+typedef signed short stbi__int16;
+typedef unsigned int stbi__uint32;
+typedef signed int stbi__int32;
+#else
+#include <stdint.h>
+typedef uint16_t stbi__uint16;
+typedef int16_t stbi__int16;
+typedef uint32_t stbi__uint32;
+typedef int32_t stbi__int32;
+#endif
+
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(stbi__uint32) == 4 ? 1 : -1];
+
+#ifdef _MSC_VER
+#define STBI_NOTUSED(v) (void)(v)
+#else
+#define STBI_NOTUSED(v) (void)sizeof(v)
+#endif
+
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+
+#ifdef STBI_HAS_LROTL
+#define stbi_lrot(x, y) _lrotl(x, y)
+#else
+#define stbi_lrot(x, y) (((x) << (y)) | ((x) >> (-(y) & 31)))
+#endif
+
+#if defined(STBI_MALLOC) && defined(STBI_FREE) &&                                                  \
+	(defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+// ok
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) &&                    \
+	!defined(STBI_REALLOC_SIZED)
+// ok
+#else
+#error                                                                                             \
+	"Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#endif
+
+#ifndef STBI_MALLOC
+#define STBI_MALLOC(sz) malloc(sz)
+#define STBI_REALLOC(p, newsz) realloc(p, newsz)
+#define STBI_FREE(p) free(p)
+#endif
+
+#ifndef STBI_REALLOC_SIZED
+#define STBI_REALLOC_SIZED(p, oldsz, newsz) STBI_REALLOC(p, newsz)
+#endif
+
+// x86/x64 detection
+#if defined(__x86_64__) || defined(_M_X64)
+#define STBI__X64_TARGET
+#elif defined(__i386) || defined(_M_IX86)
+#define STBI__X86_TARGET
+#endif
+
+#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
+// which in turn means it gets to use SSE2 everywhere. This is unfortunate,
+// but previous attempts to provide the SSE2 functions with runtime
+// detection caused numerous issues. The way architecture extensions are
+// exposed in GCC/Clang is, sadly, not really suited for one-file libs.
+// New behavior: if compiled with -msse2, we use SSE2 without any
+// detection; if not, we don't use it at all.
+#define STBI_NO_SIMD
+#endif
+
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) &&       \
+	!defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid
+// STBI__X64_TARGET
+//
+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
+// simultaneously enabling "-mstackrealign".
+//
+// See https://github.com/nothings/stb/issues/81 for more information.
+//
+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
+// -mstackrealign to your build settings, feel free to #define
+// STBI_MINGW_ENABLE_SSE2.
+#define STBI_NO_SIMD
+#endif
+
+#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
+#define STBI_SSE2
+#include <emmintrin.h>
+
+#ifdef _MSC_VER
+
+#if _MSC_VER >= 1400 // not VC6
+#include <intrin.h>	 // __cpuid
+static int stbi__cpuid3(void) {
+	int info[4];
+	__cpuid(info, 1);
+	return info[3];
+}
+#else
+static int stbi__cpuid3(void) {
+	int res;
+	__asm {
+      mov  eax,1
+      cpuid
+      mov  res,edx
+	}
+	return res;
+}
+#endif
+
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void) {
+	int info3 = stbi__cpuid3();
+	return ((info3 >> 26) & 1) != 0;
+}
+#endif
+
+#else // assume GCC-style if not VC++
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void) {
+	// If we're even attempting to compile this on GCC/Clang, that means
+	// -msse2 is on, which means the compiler is allowed to use SSE2
+	// instructions at will, and so are we.
+	return 1;
+}
+#endif
+
+#endif
+#endif
+
+// ARM NEON
+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
+#undef STBI_NEON
+#endif
+
+#ifdef STBI_NEON
+#include <arm_neon.h>
+#ifdef _MSC_VER
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+#else
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+#endif
+#endif
+
+#ifndef STBI_SIMD_ALIGN
+#define STBI_SIMD_ALIGN(type, name) type name
+#endif
+
+#ifndef STBI_MAX_DIMENSIONS
+#define STBI_MAX_DIMENSIONS (1 << 24)
+#endif
+
+///////////////////////////////////////////////
+//
+//  stbi__context struct and start_xxx functions
+
+// stbi__context structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct {
+	stbi__uint32 img_x, img_y;
+	int img_n, img_out_n;
+
+	stbi_io_callbacks io;
+	void *io_user_data;
+
+	int read_from_callbacks;
+	int buflen;
+	stbi_uc buffer_start[128];
+	int callback_already_read;
+
+	stbi_uc *img_buffer, *img_buffer_end;
+	stbi_uc *img_buffer_original, *img_buffer_original_end;
+} stbi__context;
+
+static void stbi__refill_buffer(stbi__context *s);
+
+// initialize a memory-decode context
+static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len) {
+	s->io.read = NULL;
+	s->read_from_callbacks = 0;
+	s->callback_already_read = 0;
+	s->img_buffer = s->img_buffer_original = (stbi_uc *)buffer;
+	s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *)buffer + len;
+}
+
+// initialize a callback-based context
+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user) {
+	s->io = *c;
+	s->io_user_data = user;
+	s->buflen = sizeof(s->buffer_start);
+	s->read_from_callbacks = 1;
+	s->callback_already_read = 0;
+	s->img_buffer = s->img_buffer_original = s->buffer_start;
+	stbi__refill_buffer(s);
+	s->img_buffer_original_end = s->img_buffer_end;
+}
+
+#ifndef STBI_NO_STDIO
+
+static int stbi__stdio_read(void *user, char *data, int size) {
+	return (int)fread(data, 1, size, (FILE *)user);
+}
+
+static void stbi__stdio_skip(void *user, int n) {
+	int ch;
+	fseek((FILE *)user, n, SEEK_CUR);
+	ch = fgetc((FILE *)user); /* have to read a byte to reset feof()'s flag */
+	if (ch != EOF) {
+		ungetc(ch, (FILE *)user); /* push byte back onto stream if valid. */
+	}
+}
+
+static int stbi__stdio_eof(void *user) { return feof((FILE *)user) || ferror((FILE *)user); }
+
+static stbi_io_callbacks stbi__stdio_callbacks = {
+	stbi__stdio_read,
+	stbi__stdio_skip,
+	stbi__stdio_eof,
+};
+
+static void stbi__start_file(stbi__context *s, FILE *f) {
+	stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *)f);
+}
+
+// static void stop_file(stbi__context *s) { }
+
+#endif // !STBI_NO_STDIO
+
+static void stbi__rewind(stbi__context *s) {
+	// conceptually rewind SHOULD rewind to the beginning of the stream,
+	// but we just rewind to the beginning of the initial buffer, because
+	// we only use it after doing 'test', which only ever looks at at most 92
+	// bytes
+	s->img_buffer = s->img_buffer_original;
+	s->img_buffer_end = s->img_buffer_original_end;
+}
+
+enum { STBI_ORDER_RGB, STBI_ORDER_BGR };
+
+typedef struct {
+	int bits_per_channel;
+	int num_channels;
+	int channel_order;
+} stbi__result_info;
+
+#ifndef STBI_NO_JPEG
+static int stbi__jpeg_test(stbi__context *s);
+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							 stbi__result_info *ri);
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNG
+static int stbi__png_test(stbi__context *s);
+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri);
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__png_is16(stbi__context *s);
+#endif
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test(stbi__context *s);
+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri);
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_TGA
+static int stbi__tga_test(stbi__context *s);
+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri);
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s);
+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri, int bpc);
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__psd_is16(stbi__context *s);
+#endif
+
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test(stbi__context *s);
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							 stbi__result_info *ri);
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_test(stbi__context *s);
+static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri);
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_GIF
+static int stbi__gif_test(stbi__context *s);
+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri);
+static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp,
+								 int req_comp);
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNM
+static int stbi__pnm_test(stbi__context *s);
+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri);
+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__pnm_is16(stbi__context *s);
+#endif
+
+static
+#ifdef STBI_THREAD_LOCAL
+	STBI_THREAD_LOCAL
+#endif
+	const char *stbi__g_failure_reason;
+
+STBIDEF const char *stbi_failure_reason(void) { return stbi__g_failure_reason; }
+
+#ifndef STBI_NO_FAILURE_STRINGS
+static int stbi__err(const char *str) {
+	stbi__g_failure_reason = str;
+	return 0;
+}
+#endif
+
+static void *stbi__malloc(size_t size) { return STBI_MALLOC(size); }
+
+// stb_image uses ints pervasively, including for offset calculations.
+// therefore the largest decoded image size we can support with the
+// current code, even on 64-bit targets, is INT_MAX. this is not a
+// significant limitation for the intended use case.
+//
+// we do, however, need to make sure our size calculations don't
+// overflow. hence a few helper functions for size calculations that
+// multiply integers together, making sure that they're non-negative
+// and no overflow occurs.
+
+// return 1 if the sum is valid, 0 on overflow.
+// negative terms are considered invalid.
+static int stbi__addsizes_valid(int a, int b) {
+	if (b < 0) return 0;
+	// now 0 <= b <= INT_MAX, hence also
+	// 0 <= INT_MAX - b <= INTMAX.
+	// And "a + b <= INT_MAX" (which might overflow) is the
+	// same as a <= INT_MAX - b (no overflow)
+	return a <= INT_MAX - b;
+}
+
+// returns 1 if the product is valid, 0 on overflow.
+// negative factors are considered invalid.
+static int stbi__mul2sizes_valid(int a, int b) {
+	if (a < 0 || b < 0) return 0;
+	if (b == 0) return 1; // mul-by-0 is always safe
+	// portable way to check for no overflows in a*b
+	return a <= INT_MAX / b;
+}
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) ||                    \
+	!defined(STBI_NO_HDR)
+// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad2sizes_valid(int a, int b, int add) {
+	return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a * b, add);
+}
+#endif
+
+// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad3sizes_valid(int a, int b, int c, int add) {
+	return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a * b, c) &&
+		   stbi__addsizes_valid(a * b * c, add);
+}
+
+// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't
+// overflow
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
+static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) {
+	return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a * b, c) &&
+		   stbi__mul2sizes_valid(a * b * c, d) && stbi__addsizes_valid(a * b * c * d, add);
+}
+#endif
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) ||                    \
+	!defined(STBI_NO_HDR)
+// mallocs with size overflow checking
+static void *stbi__malloc_mad2(int a, int b, int add) {
+	if (!stbi__mad2sizes_valid(a, b, add)) return NULL;
+	return stbi__malloc(a * b + add);
+}
+#endif
+
+static void *stbi__malloc_mad3(int a, int b, int c, int add) {
+	if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL;
+	return stbi__malloc(a * b * c + add);
+}
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM)
+static void *stbi__malloc_mad4(int a, int b, int c, int d, int add) {
+	if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
+	return stbi__malloc(a * b * c * d + add);
+}
+#endif
+
+// returns 1 if the sum of two signed ints is valid (between -2^31 and 2^31-1
+// inclusive), 0 on overflow.
+static int stbi__addints_valid(int a, int b) {
+	if ((a >= 0) != (b >= 0)) return 1; // a and b have different signs, so no overflow
+	if (a < 0 && b < 0)
+		return a >= INT_MIN - b; // same as a + b >= INT_MIN; INT_MIN - b cannot
+								 // overflow since b < 0.
+	return a <= INT_MAX - b;
+}
+
+// returns 1 if the product of two ints fits in a signed short, 0 on overflow.
+static int stbi__mul2shorts_valid(int a, int b) {
+	if (b == 0 || b == -1)
+		return 1; // multiplication by 0 is always 0; check for -1 so SHRT_MIN/b
+				  // doesn't overflow
+	if ((a >= 0) == (b >= 0))
+		return a <= SHRT_MAX / b;		 // product is positive, so similar to mul2sizes_valid
+	if (b < 0) return a <= SHRT_MIN / b; // same as a * b >= SHRT_MIN
+	return a >= SHRT_MIN / b;
+}
+
+// stbi__err - error
+// stbi__errpf - error returning pointer to float
+// stbi__errpuc - error returning pointer to unsigned char
+
+#ifdef STBI_NO_FAILURE_STRINGS
+#define stbi__err(x, y) 0
+#elif defined(STBI_FAILURE_USERMSG)
+#define stbi__err(x, y) stbi__err(y)
+#else
+#define stbi__err(x, y) stbi__err(x)
+#endif
+
+#define stbi__errpf(x, y) ((float *)(size_t)(stbi__err(x, y) ? NULL : NULL))
+#define stbi__errpuc(x, y) ((unsigned char *)(size_t)(stbi__err(x, y) ? NULL : NULL))
+
+STBIDEF void stbi_image_free(void *retval_from_stbi_load) { STBI_FREE(retval_from_stbi_load); }
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp);
+#endif
+
+static int stbi__vertically_flip_on_load_global = 0;
+
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) {
+	stbi__vertically_flip_on_load_global = flag_true_if_should_flip;
+}
+
+#ifndef STBI_THREAD_LOCAL
+#define stbi__vertically_flip_on_load stbi__vertically_flip_on_load_global
+#else
+static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set;
+
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip) {
+	stbi__vertically_flip_on_load_local = flag_true_if_should_flip;
+	stbi__vertically_flip_on_load_set = 1;
+}
+
+#define stbi__vertically_flip_on_load                                                              \
+	(stbi__vertically_flip_on_load_set ? stbi__vertically_flip_on_load_local                       \
+									   : stbi__vertically_flip_on_load_global)
+#endif // STBI_THREAD_LOCAL
+
+static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							 stbi__result_info *ri, int bpc) {
+	memset(ri, 0,
+		   sizeof(*ri));				// make sure it's initialized if we add new fields
+	ri->bits_per_channel = 8;			// default is 8 so most paths don't have to be changed
+	ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here
+										// so we can add BGR order
+	ri->num_channels = 0;
+
+// test the formats with a very explicit header first (at least a FOURCC
+// or distinctive magic number first)
+#ifndef STBI_NO_PNG
+	if (stbi__png_test(s)) return stbi__png_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_BMP
+	if (stbi__bmp_test(s)) return stbi__bmp_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_GIF
+	if (stbi__gif_test(s)) return stbi__gif_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PSD
+	if (stbi__psd_test(s)) return stbi__psd_load(s, x, y, comp, req_comp, ri, bpc);
+#else
+	STBI_NOTUSED(bpc);
+#endif
+#ifndef STBI_NO_PIC
+	if (stbi__pic_test(s)) return stbi__pic_load(s, x, y, comp, req_comp, ri);
+#endif
+
+// then the formats that can end up attempting to load with just 1 or 2
+// bytes matching expectations; these are prone to false positives, so
+// try them later
+#ifndef STBI_NO_JPEG
+	if (stbi__jpeg_test(s)) return stbi__jpeg_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PNM
+	if (stbi__pnm_test(s)) return stbi__pnm_load(s, x, y, comp, req_comp, ri);
+#endif
+
+#ifndef STBI_NO_HDR
+	if (stbi__hdr_test(s)) {
+		float *hdr = stbi__hdr_load(s, x, y, comp, req_comp, ri);
+		return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+	}
+#endif
+
+#ifndef STBI_NO_TGA
+	// test tga last because it's a crappy test!
+	if (stbi__tga_test(s)) return stbi__tga_load(s, x, y, comp, req_comp, ri);
+#endif
+
+	return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels) {
+	int i;
+	int img_len = w * h * channels;
+	stbi_uc *reduced;
+
+	reduced = (stbi_uc *)stbi__malloc(img_len);
+	if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory");
+
+	for (i = 0; i < img_len; ++i)
+		reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient
+													   // approx of 16->8 bit scaling
+
+	STBI_FREE(orig);
+	return reduced;
+}
+
+static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels) {
+	int i;
+	int img_len = w * h * channels;
+	stbi__uint16 *enlarged;
+
+	enlarged = (stbi__uint16 *)stbi__malloc(img_len * 2);
+	if (enlarged == NULL) return (stbi__uint16 *)stbi__errpuc("outofmem", "Out of memory");
+
+	for (i = 0; i < img_len; ++i)
+		enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low
+																// byte, maps 0->0, 255->0xffff
+
+	STBI_FREE(orig);
+	return enlarged;
+}
+
+static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel) {
+	int row;
+	size_t bytes_per_row = (size_t)w * bytes_per_pixel;
+	stbi_uc temp[2048];
+	stbi_uc *bytes = (stbi_uc *)image;
+
+	for (row = 0; row < (h >> 1); row++) {
+		stbi_uc *row0 = bytes + row * bytes_per_row;
+		stbi_uc *row1 = bytes + (h - row - 1) * bytes_per_row;
+		// swap row0 with row1
+		size_t bytes_left = bytes_per_row;
+		while (bytes_left) {
+			size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp);
+			memcpy(temp, row0, bytes_copy);
+			memcpy(row0, row1, bytes_copy);
+			memcpy(row1, temp, bytes_copy);
+			row0 += bytes_copy;
+			row1 += bytes_copy;
+			bytes_left -= bytes_copy;
+		}
+	}
+}
+
+#ifndef STBI_NO_GIF
+static void stbi__vertical_flip_slices(void *image, int w, int h, int z, int bytes_per_pixel) {
+	int slice;
+	int slice_size = w * h * bytes_per_pixel;
+
+	stbi_uc *bytes = (stbi_uc *)image;
+	for (slice = 0; slice < z; ++slice) {
+		stbi__vertical_flip(bytes, w, h, bytes_per_pixel);
+		bytes += slice_size;
+	}
+}
+#endif
+
+static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp,
+													  int req_comp) {
+	stbi__result_info ri;
+	void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
+
+	if (result == NULL) return NULL;
+
+	// it is the responsibility of the loaders to make sure we get either 8 or
+	// 16 bit.
+	STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16);
+
+	if (ri.bits_per_channel != 8) {
+		result =
+			stbi__convert_16_to_8((stbi__uint16 *)result, *x, *y, req_comp == 0 ? *comp : req_comp);
+		ri.bits_per_channel = 8;
+	}
+
+	// @TODO: move stbi__convert_format to here
+
+	if (stbi__vertically_flip_on_load) {
+		int channels = req_comp ? req_comp : *comp;
+		stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc));
+	}
+
+	return (unsigned char *)result;
+}
+
+static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp,
+													  int req_comp) {
+	stbi__result_info ri;
+	void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
+
+	if (result == NULL) return NULL;
+
+	// it is the responsibility of the loaders to make sure we get either 8 or
+	// 16 bit.
+	STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16);
+
+	if (ri.bits_per_channel != 16) {
+		result = stbi__convert_8_to_16((stbi_uc *)result, *x, *y, req_comp == 0 ? *comp : req_comp);
+		ri.bits_per_channel = 16;
+	}
+
+	// @TODO: move stbi__convert_format16 to here
+	// @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to
+	// keep more precision
+
+	if (stbi__vertically_flip_on_load) {
+		int channels = req_comp ? req_comp : *comp;
+		stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16));
+	}
+
+	return (stbi__uint16 *)result;
+}
+
+#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR)
+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp) {
+	if (stbi__vertically_flip_on_load && result != NULL) {
+		int channels = req_comp ? req_comp : *comp;
+		stbi__vertical_flip(result, *x, *y, channels * sizeof(float));
+	}
+}
+#endif
+
+#ifndef STBI_NO_STDIO
+
+#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8)
+STBI_EXTERN
+__declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags,
+														const char *str, int cbmb, wchar_t *widestr,
+														int cchwide);
+STBI_EXTERN
+__declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags,
+														const wchar_t *widestr, int cchwide,
+														char *str, int cbmb, const char *defchar,
+														int *used_default);
+#endif
+
+#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8)
+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t *input) {
+	return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int)bufferlen, NULL, NULL);
+}
+#endif
+
+static FILE *stbi__fopen(char const *filename, char const *mode) {
+	FILE *f;
+#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8)
+	wchar_t wMode[64];
+	wchar_t wFilename[1024];
+	if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename,
+								 sizeof(wFilename) / sizeof(*wFilename)))
+		return 0;
+
+	if (0 ==
+		MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode) / sizeof(*wMode)))
+		return 0;
+
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+	if (0 != _wfopen_s(&f, wFilename, wMode)) f = 0;
+#else
+	f = _wfopen(wFilename, wMode);
+#endif
+
+#elif defined(_MSC_VER) && _MSC_VER >= 1400
+	if (0 != fopen_s(&f, filename, mode)) f = 0;
+#else
+	f = fopen(filename, mode);
+#endif
+	return f;
+}
+
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) {
+	FILE *f = stbi__fopen(filename, "rb");
+	unsigned char *result;
+	if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
+	result = stbi_load_from_file(f, x, y, comp, req_comp);
+	fclose(f);
+	return result;
+}
+
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) {
+	unsigned char *result;
+	stbi__context s;
+	stbi__start_file(&s, f);
+	result = stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
+	if (result) {
+		// need to 'unget' all the characters in the IO buffer
+		fseek(f, -(int)(s.img_buffer_end - s.img_buffer), SEEK_CUR);
+	}
+	return result;
+}
+
+STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp) {
+	stbi__uint16 *result;
+	stbi__context s;
+	stbi__start_file(&s, f);
+	result = stbi__load_and_postprocess_16bit(&s, x, y, comp, req_comp);
+	if (result) {
+		// need to 'unget' all the characters in the IO buffer
+		fseek(f, -(int)(s.img_buffer_end - s.img_buffer), SEEK_CUR);
+	}
+	return result;
+}
+
+STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp) {
+	FILE *f = stbi__fopen(filename, "rb");
+	stbi__uint16 *result;
+	if (!f) return (stbi_us *)stbi__errpuc("can't fopen", "Unable to open file");
+	result = stbi_load_from_file_16(f, x, y, comp, req_comp);
+	fclose(f);
+	return result;
+}
+
+#endif //! STBI_NO_STDIO
+
+STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y,
+										  int *channels_in_file, int desired_channels) {
+	stbi__context s;
+	stbi__start_mem(&s, buffer, len);
+	return stbi__load_and_postprocess_16bit(&s, x, y, channels_in_file, desired_channels);
+}
+
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x,
+											 int *y, int *channels_in_file, int desired_channels) {
+	stbi__context s;
+	stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+	return stbi__load_and_postprocess_16bit(&s, x, y, channels_in_file, desired_channels);
+}
+
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp,
+									   int req_comp) {
+	stbi__context s;
+	stbi__start_mem(&s, buffer, len);
+	return stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
+}
+
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y,
+										  int *comp, int req_comp) {
+	stbi__context s;
+	stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+	return stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
+}
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x,
+										   int *y, int *z, int *comp, int req_comp) {
+	unsigned char *result;
+	stbi__context s;
+	stbi__start_mem(&s, buffer, len);
+
+	result = (unsigned char *)stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp);
+	if (stbi__vertically_flip_on_load) {
+		stbi__vertical_flip_slices(result, *x, *y, *z, *comp);
+	}
+
+	return result;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) {
+	unsigned char *data;
+#ifndef STBI_NO_HDR
+	if (stbi__hdr_test(s)) {
+		stbi__result_info ri;
+		float *hdr_data = stbi__hdr_load(s, x, y, comp, req_comp, &ri);
+		if (hdr_data) stbi__float_postprocess(hdr_data, x, y, comp, req_comp);
+		return hdr_data;
+	}
+#endif
+	data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
+	if (data) return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+	return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
+}
+
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp,
+									  int req_comp) {
+	stbi__context s;
+	stbi__start_mem(&s, buffer, len);
+	return stbi__loadf_main(&s, x, y, comp, req_comp);
+}
+
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y,
+										 int *comp, int req_comp) {
+	stbi__context s;
+	stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+	return stbi__loadf_main(&s, x, y, comp, req_comp);
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) {
+	float *result;
+	FILE *f = stbi__fopen(filename, "rb");
+	if (!f) return stbi__errpf("can't fopen", "Unable to open file");
+	result = stbi_loadf_from_file(f, x, y, comp, req_comp);
+	fclose(f);
+	return result;
+}
+
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) {
+	stbi__context s;
+	stbi__start_file(&s, f);
+	return stbi__loadf_main(&s, x, y, comp, req_comp);
+}
+#endif // !STBI_NO_STDIO
+
+#endif // !STBI_NO_LINEAR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
+// reports false!
+
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) {
+#ifndef STBI_NO_HDR
+	stbi__context s;
+	stbi__start_mem(&s, buffer, len);
+	return stbi__hdr_test(&s);
+#else
+	STBI_NOTUSED(buffer);
+	STBI_NOTUSED(len);
+	return 0;
+#endif
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_is_hdr(char const *filename) {
+	FILE *f = stbi__fopen(filename, "rb");
+	int result = 0;
+	if (f) {
+		result = stbi_is_hdr_from_file(f);
+		fclose(f);
+	}
+	return result;
+}
+
+STBIDEF int stbi_is_hdr_from_file(FILE *f) {
+#ifndef STBI_NO_HDR
+	long pos = ftell(f);
+	int res;
+	stbi__context s;
+	stbi__start_file(&s, f);
+	res = stbi__hdr_test(&s);
+	fseek(f, pos, SEEK_SET);
+	return res;
+#else
+	STBI_NOTUSED(f);
+	return 0;
+#endif
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) {
+#ifndef STBI_NO_HDR
+	stbi__context s;
+	stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+	return stbi__hdr_test(&s);
+#else
+	STBI_NOTUSED(clbk);
+	STBI_NOTUSED(user);
+	return 0;
+#endif
+}
+
+#ifndef STBI_NO_LINEAR
+static float stbi__l2h_gamma = 2.2f, stbi__l2h_scale = 1.0f;
+
+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
+STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+#endif
+
+static float stbi__h2l_gamma_i = 1.0f / 2.2f, stbi__h2l_scale_i = 1.0f;
+
+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1 / gamma; }
+STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1 / scale; }
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum { STBI__SCAN_load = 0, STBI__SCAN_type, STBI__SCAN_header };
+
+static void stbi__refill_buffer(stbi__context *s) {
+	int n = (s->io.read)(s->io_user_data, (char *)s->buffer_start, s->buflen);
+	s->callback_already_read += (int)(s->img_buffer - s->img_buffer_original);
+	if (n == 0) {
+		// at end of file, treat same as if from memory, but need to handle case
+		// where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+		s->read_from_callbacks = 0;
+		s->img_buffer = s->buffer_start;
+		s->img_buffer_end = s->buffer_start + 1;
+		*s->img_buffer = 0;
+	} else {
+		s->img_buffer = s->buffer_start;
+		s->img_buffer_end = s->buffer_start + n;
+	}
+}
+
+stbi_inline static stbi_uc stbi__get8(stbi__context *s) {
+	if (s->img_buffer < s->img_buffer_end) return *s->img_buffer++;
+	if (s->read_from_callbacks) {
+		stbi__refill_buffer(s);
+		return *s->img_buffer++;
+	}
+	return 0;
+}
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+stbi_inline static int stbi__at_eof(stbi__context *s) {
+	if (s->io.read) {
+		if (!(s->io.eof)(s->io_user_data)) return 0;
+		// if feof() is true, check if buffer = end
+		// special case: we've only got the special 0 character at the end
+		if (s->read_from_callbacks == 0) return 1;
+	}
+
+	return s->img_buffer >= s->img_buffer_end;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) &&                       \
+	defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC)
+// nothing
+#else
+static void stbi__skip(stbi__context *s, int n) {
+	if (n == 0) return; // already there!
+	if (n < 0) {
+		s->img_buffer = s->img_buffer_end;
+		return;
+	}
+	if (s->io.read) {
+		int blen = (int)(s->img_buffer_end - s->img_buffer);
+		if (blen < n) {
+			s->img_buffer = s->img_buffer_end;
+			(s->io.skip)(s->io_user_data, n - blen);
+			return;
+		}
+	}
+	s->img_buffer += n;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM)
+// nothing
+#else
+static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n) {
+	if (s->io.read) {
+		int blen = (int)(s->img_buffer_end - s->img_buffer);
+		if (blen < n) {
+			int res, count;
+
+			memcpy(buffer, s->img_buffer, blen);
+
+			count = (s->io.read)(s->io_user_data, (char *)buffer + blen, n - blen);
+			res = (count == (n - blen));
+			s->img_buffer = s->img_buffer_end;
+			return res;
+		}
+	}
+
+	if (s->img_buffer + n <= s->img_buffer_end) {
+		memcpy(buffer, s->img_buffer, n);
+		s->img_buffer += n;
+		return 1;
+	} else
+		return 0;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static int stbi__get16be(stbi__context *s) {
+	int z = stbi__get8(s);
+	return (z << 8) + stbi__get8(s);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static stbi__uint32 stbi__get32be(stbi__context *s) {
+	stbi__uint32 z = stbi__get16be(s);
+	return (z << 16) + stbi__get16be(s);
+}
+#endif
+
+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
+// nothing
+#else
+static int stbi__get16le(stbi__context *s) {
+	int z = stbi__get8(s);
+	return z + (stbi__get8(s) << 8);
+}
+#endif
+
+#ifndef STBI_NO_BMP
+static stbi__uint32 stbi__get32le(stbi__context *s) {
+	stbi__uint32 z = stbi__get16le(s);
+	z += (stbi__uint32)stbi__get16le(s) << 16;
+	return z;
+}
+#endif
+
+#define STBI__BYTECAST(x) ((stbi_uc)((x) & 255)) // truncate int to byte without warnings
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) &&                       \
+	defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) &&                        \
+	defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+//////////////////////////////////////////////////////////////////////////////
+//
+//  generic converter from built-in img_n to req_comp
+//    individual types do this automatically as much as possible (e.g. jpeg
+//    does all cases internally since it needs to colorspace convert anyway,
+//    and it never has alpha, so very few cases ). png can automatically
+//    interleave an alpha=255 channel, but falls back to this for other cases
+//
+//  assume data buffer is malloced, so malloc a new one and free that one
+//  only failure mode is malloc failing
+
+static stbi_uc stbi__compute_y(int r, int g, int b) {
+	return (stbi_uc)(((r * 77) + (g * 150) + (29 * b)) >> 8);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) &&                        \
+	defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp,
+										   unsigned int x, unsigned int y) {
+	int i, j;
+	unsigned char *good;
+
+	if (req_comp == img_n) return data;
+	STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+	good = (unsigned char *)stbi__malloc_mad3(req_comp, x, y, 0);
+	if (good == NULL) {
+		STBI_FREE(data);
+		return stbi__errpuc("outofmem", "Out of memory");
+	}
+
+	for (j = 0; j < (int)y; ++j) {
+		unsigned char *src = data + j * x * img_n;
+		unsigned char *dest = good + j * x * req_comp;
+
+#define STBI__COMBO(a, b) ((a) * 8 + (b))
+#define STBI__CASE(a, b)                                                                           \
+	case STBI__COMBO(a, b):                                                                        \
+		for (i = x - 1; i >= 0; --i, src += a, dest += b)
+		// convert source image with img_n components to one with req_comp
+		// components; avoid switch per pixel, so use switch per scanline and
+		// massive macros
+		switch (STBI__COMBO(img_n, req_comp)) {
+			STBI__CASE(1, 2) {
+				dest[0] = src[0];
+				dest[1] = 255;
+			}
+			break;
+			STBI__CASE(1, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+			break;
+			STBI__CASE(1, 4) {
+				dest[0] = dest[1] = dest[2] = src[0];
+				dest[3] = 255;
+			}
+			break;
+			STBI__CASE(2, 1) { dest[0] = src[0]; }
+			break;
+			STBI__CASE(2, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+			break;
+			STBI__CASE(2, 4) {
+				dest[0] = dest[1] = dest[2] = src[0];
+				dest[3] = src[1];
+			}
+			break;
+			STBI__CASE(3, 4) {
+				dest[0] = src[0];
+				dest[1] = src[1];
+				dest[2] = src[2];
+				dest[3] = 255;
+			}
+			break;
+			STBI__CASE(3, 1) { dest[0] = stbi__compute_y(src[0], src[1], src[2]); }
+			break;
+			STBI__CASE(3, 2) {
+				dest[0] = stbi__compute_y(src[0], src[1], src[2]);
+				dest[1] = 255;
+			}
+			break;
+			STBI__CASE(4, 1) { dest[0] = stbi__compute_y(src[0], src[1], src[2]); }
+			break;
+			STBI__CASE(4, 2) {
+				dest[0] = stbi__compute_y(src[0], src[1], src[2]);
+				dest[1] = src[3];
+			}
+			break;
+			STBI__CASE(4, 3) {
+				dest[0] = src[0];
+				dest[1] = src[1];
+				dest[2] = src[2];
+			}
+			break;
+		default:
+			STBI_ASSERT(0);
+			STBI_FREE(data);
+			STBI_FREE(good);
+			return stbi__errpuc("unsupported", "Unsupported format conversion");
+		}
+#undef STBI__CASE
+	}
+
+	STBI_FREE(data);
+	return good;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16 stbi__compute_y_16(int r, int g, int b) {
+	return (stbi__uint16)(((r * 77) + (g * 150) + (29 * b)) >> 8);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp,
+											unsigned int x, unsigned int y) {
+	int i, j;
+	stbi__uint16 *good;
+
+	if (req_comp == img_n) return data;
+	STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+	good = (stbi__uint16 *)stbi__malloc(req_comp * x * y * 2);
+	if (good == NULL) {
+		STBI_FREE(data);
+		return (stbi__uint16 *)stbi__errpuc("outofmem", "Out of memory");
+	}
+
+	for (j = 0; j < (int)y; ++j) {
+		stbi__uint16 *src = data + j * x * img_n;
+		stbi__uint16 *dest = good + j * x * req_comp;
+
+#define STBI__COMBO(a, b) ((a) * 8 + (b))
+#define STBI__CASE(a, b)                                                                           \
+	case STBI__COMBO(a, b):                                                                        \
+		for (i = x - 1; i >= 0; --i, src += a, dest += b)
+		// convert source image with img_n components to one with req_comp
+		// components; avoid switch per pixel, so use switch per scanline and
+		// massive macros
+		switch (STBI__COMBO(img_n, req_comp)) {
+			STBI__CASE(1, 2) {
+				dest[0] = src[0];
+				dest[1] = 0xffff;
+			}
+			break;
+			STBI__CASE(1, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+			break;
+			STBI__CASE(1, 4) {
+				dest[0] = dest[1] = dest[2] = src[0];
+				dest[3] = 0xffff;
+			}
+			break;
+			STBI__CASE(2, 1) { dest[0] = src[0]; }
+			break;
+			STBI__CASE(2, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+			break;
+			STBI__CASE(2, 4) {
+				dest[0] = dest[1] = dest[2] = src[0];
+				dest[3] = src[1];
+			}
+			break;
+			STBI__CASE(3, 4) {
+				dest[0] = src[0];
+				dest[1] = src[1];
+				dest[2] = src[2];
+				dest[3] = 0xffff;
+			}
+			break;
+			STBI__CASE(3, 1) { dest[0] = stbi__compute_y_16(src[0], src[1], src[2]); }
+			break;
+			STBI__CASE(3, 2) {
+				dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
+				dest[1] = 0xffff;
+			}
+			break;
+			STBI__CASE(4, 1) { dest[0] = stbi__compute_y_16(src[0], src[1], src[2]); }
+			break;
+			STBI__CASE(4, 2) {
+				dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
+				dest[1] = src[3];
+			}
+			break;
+			STBI__CASE(4, 3) {
+				dest[0] = src[0];
+				dest[1] = src[1];
+				dest[2] = src[2];
+			}
+			break;
+		default:
+			STBI_ASSERT(0);
+			STBI_FREE(data);
+			STBI_FREE(good);
+			return (stbi__uint16 *)stbi__errpuc("unsupported", "Unsupported format conversion");
+		}
+#undef STBI__CASE
+	}
+
+	STBI_FREE(data);
+	return good;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp) {
+	int i, k, n;
+	float *output;
+	if (!data) return NULL;
+	output = (float *)stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
+	if (output == NULL) {
+		STBI_FREE(data);
+		return stbi__errpf("outofmem", "Out of memory");
+	}
+	// compute number of non-alpha components
+	if (comp & 1)
+		n = comp;
+	else
+		n = comp - 1;
+	for (i = 0; i < x * y; ++i) {
+		for (k = 0; k < n; ++k) {
+			output[i * comp + k] =
+				(float)(pow(data[i * comp + k] / 255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
+		}
+	}
+	if (n < comp) {
+		for (i = 0; i < x * y; ++i) {
+			output[i * comp + n] = data[i * comp + n] / 255.0f;
+		}
+	}
+	STBI_FREE(data);
+	return output;
+}
+#endif
+
+#ifndef STBI_NO_HDR
+#define stbi__float2int(x) ((int)(x))
+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp) {
+	int i, k, n;
+	stbi_uc *output;
+	if (!data) return NULL;
+	output = (stbi_uc *)stbi__malloc_mad3(x, y, comp, 0);
+	if (output == NULL) {
+		STBI_FREE(data);
+		return stbi__errpuc("outofmem", "Out of memory");
+	}
+	// compute number of non-alpha components
+	if (comp & 1)
+		n = comp;
+	else
+		n = comp - 1;
+	for (i = 0; i < x * y; ++i) {
+		for (k = 0; k < n; ++k) {
+			float z =
+				(float)pow(data[i * comp + k] * stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
+			if (z < 0) z = 0;
+			if (z > 255) z = 255;
+			output[i * comp + k] = (stbi_uc)stbi__float2int(z);
+		}
+		if (k < comp) {
+			float z = data[i * comp + k] * 255 + 0.5f;
+			if (z < 0) z = 0;
+			if (z > 255) z = 255;
+			output[i * comp + k] = (stbi_uc)stbi__float2int(z);
+		}
+	}
+	STBI_FREE(data);
+	return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  "baseline" JPEG/JFIF decoder
+//
+//    simple implementation
+//      - doesn't support delayed output of y-dimension
+//      - simple interface (only one output format: 8-bit interleaved RGB)
+//      - doesn't try to recover corrupt jpegs
+//      - doesn't allow partial loading, loading multiple at once
+//      - still fast on x86 (copying globals into locals doesn't help x86)
+//      - allocates lots of intermediate memory (full size of all components)
+//        - non-interleaved case requires this anyway
+//        - allows good upsampling (see next)
+//    high-quality
+//      - upsampled channels are bilinearly interpolated, even across blocks
+//      - quality integer IDCT derived from IJG's 'slow'
+//    performance
+//      - fast huffman; reasonable integer IDCT
+//      - some SIMD kernels for common paths on targets with SSE2/NEON
+//      - uses a lot of intermediate memory, could cache poorly
+
+#ifndef STBI_NO_JPEG
+
+// huffman decoding acceleration
+#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
+
+typedef struct {
+	stbi_uc fast[1 << FAST_BITS];
+	// weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+	stbi__uint16 code[256];
+	stbi_uc values[256];
+	stbi_uc size[257];
+	unsigned int maxcode[18];
+	int delta[17]; // old 'firstsymbol' - old 'firstcode'
+} stbi__huffman;
+
+typedef struct {
+	stbi__context *s;
+	stbi__huffman huff_dc[4];
+	stbi__huffman huff_ac[4];
+	stbi__uint16 dequant[4][64];
+	stbi__int16 fast_ac[4][1 << FAST_BITS];
+
+	// sizes for components, interleaved MCUs
+	int img_h_max, img_v_max;
+	int img_mcu_x, img_mcu_y;
+	int img_mcu_w, img_mcu_h;
+
+	// definition of jpeg image component
+	struct {
+		int id;
+		int h, v;
+		int tq;
+		int hd, ha;
+		int dc_pred;
+
+		int x, y, w2, h2;
+		stbi_uc *data;
+		void *raw_data, *raw_coeff;
+		stbi_uc *linebuf;
+		short *coeff;		  // progressive only
+		int coeff_w, coeff_h; // number of 8x8 coefficient blocks
+	} img_comp[4];
+
+	stbi__uint32 code_buffer; // jpeg entropy-coded buffer
+	int code_bits;			  // number of valid bits
+	unsigned char marker;	  // marker seen while filling entropy buffer
+	int nomore;				  // flag if we saw a marker so must stop
+
+	int progressive;
+	int spec_start;
+	int spec_end;
+	int succ_high;
+	int succ_low;
+	int eob_run;
+	int jfif;
+	int app14_color_transform; // Adobe APP14 tag
+	int rgb;
+
+	int scan_n, order[4];
+	int restart_interval, todo;
+
+	// kernels
+	void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
+	void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb,
+								const stbi_uc *pcr, int count, int step);
+	stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w,
+										 int hs);
+} stbi__jpeg;
+
+static int stbi__build_huffman(stbi__huffman *h, int *count) {
+	int i, j, k = 0;
+	unsigned int code;
+	// build size list for each symbol (from JPEG spec)
+	for (i = 0; i < 16; ++i) {
+		for (j = 0; j < count[i]; ++j) {
+			h->size[k++] = (stbi_uc)(i + 1);
+			if (k >= 257) return stbi__err("bad size list", "Corrupt JPEG");
+		}
+	}
+	h->size[k] = 0;
+
+	// compute actual symbols (from jpeg spec)
+	code = 0;
+	k = 0;
+	for (j = 1; j <= 16; ++j) {
+		// compute delta to add to code to compute symbol id
+		h->delta[j] = k - code;
+		if (h->size[k] == j) {
+			while (h->size[k] == j) h->code[k++] = (stbi__uint16)(code++);
+			if (code - 1 >= (1u << j)) return stbi__err("bad code lengths", "Corrupt JPEG");
+		}
+		// compute largest code + 1 for this size, preshifted as needed later
+		h->maxcode[j] = code << (16 - j);
+		code <<= 1;
+	}
+	h->maxcode[j] = 0xffffffff;
+
+	// build non-spec acceleration table; 255 is flag for not-accelerated
+	memset(h->fast, 255, 1 << FAST_BITS);
+	for (i = 0; i < k; ++i) {
+		int s = h->size[i];
+		if (s <= FAST_BITS) {
+			int c = h->code[i] << (FAST_BITS - s);
+			int m = 1 << (FAST_BITS - s);
+			for (j = 0; j < m; ++j) {
+				h->fast[c + j] = (stbi_uc)i;
+			}
+		}
+	}
+	return 1;
+}
+
+// build a table that decodes both magnitude and value of small ACs in
+// one go.
+static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h) {
+	int i;
+	for (i = 0; i < (1 << FAST_BITS); ++i) {
+		stbi_uc fast = h->fast[i];
+		fast_ac[i] = 0;
+		if (fast < 255) {
+			int rs = h->values[fast];
+			int run = (rs >> 4) & 15;
+			int magbits = rs & 15;
+			int len = h->size[fast];
+
+			if (magbits && len + magbits <= FAST_BITS) {
+				// magnitude code followed by receive_extend code
+				int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
+				int m = 1 << (magbits - 1);
+				if (k < m) k += (~0U << magbits) + 1;
+				// if the result is small enough, we can fit it in fast_ac table
+				if (k >= -128 && k <= 127)
+					fast_ac[i] = (stbi__int16)((k * 256) + (run * 16) + (len + magbits));
+			}
+		}
+	}
+}
+
+static void stbi__grow_buffer_unsafe(stbi__jpeg *j) {
+	do {
+		unsigned int b = j->nomore ? 0 : stbi__get8(j->s);
+		if (b == 0xff) {
+			int c = stbi__get8(j->s);
+			while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes
+			if (c != 0) {
+				j->marker = (unsigned char)c;
+				j->nomore = 1;
+				return;
+			}
+		}
+		j->code_buffer |= b << (24 - j->code_bits);
+		j->code_bits += 8;
+	} while (j->code_bits <= 24);
+}
+
+// (1 << n) - 1
+static const stbi__uint32 stbi__bmask[17] = {0,	  1,	3,	  7,	15,	  31,	 63,	127,  255,
+											 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535};
+
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h) {
+	unsigned int temp;
+	int c, k;
+
+	if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+	// look at the top FAST_BITS and determine what symbol ID it is,
+	// if the code is <= FAST_BITS
+	c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+	k = h->fast[c];
+	if (k < 255) {
+		int s = h->size[k];
+		if (s > j->code_bits) return -1;
+		j->code_buffer <<= s;
+		j->code_bits -= s;
+		return h->values[k];
+	}
+
+	// naive test is to shift the code_buffer down so k bits are
+	// valid, then test against maxcode. To speed this up, we've
+	// preshifted maxcode left so that it has (16-k) 0s at the
+	// end; in other words, regardless of the number of bits, it
+	// wants to be compared against something shifted to have 16;
+	// that way we don't need to shift inside the loop.
+	temp = j->code_buffer >> 16;
+	for (k = FAST_BITS + 1;; ++k)
+		if (temp < h->maxcode[k]) break;
+	if (k == 17) {
+		// error! code not found
+		j->code_bits -= 16;
+		return -1;
+	}
+
+	if (k > j->code_bits) return -1;
+
+	// convert the huffman code to the symbol id
+	c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+	if (c < 0 || c >= 256) // symbol id out of bounds!
+		return -1;
+	STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
+
+	// convert the id to a symbol
+	j->code_bits -= k;
+	j->code_buffer <<= k;
+	return h->values[c];
+}
+
+// bias[n] = (-1<<n) + 1
+static const int stbi__jbias[16] = {0,	  -1,	-3,	   -7,	  -15,	 -31,	-63,	-127,
+									-255, -511, -1023, -2047, -4095, -8191, -16383, -32767};
+
+// combined JPEG 'receive' and JPEG 'extend', since baseline
+// always extends everything it receives.
+stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n) {
+	unsigned int k;
+	int sgn;
+	if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+	if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
+
+	sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear
+								// (positive), 1 if MSB set (negative)
+	k = stbi_lrot(j->code_buffer, n);
+	j->code_buffer = k & ~stbi__bmask[n];
+	k &= stbi__bmask[n];
+	j->code_bits -= n;
+	return k + (stbi__jbias[n] & (sgn - 1));
+}
+
+// get some unsigned bits
+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) {
+	unsigned int k;
+	if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+	if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing
+	k = stbi_lrot(j->code_buffer, n);
+	j->code_buffer = k & ~stbi__bmask[n];
+	k &= stbi__bmask[n];
+	j->code_bits -= n;
+	return k;
+}
+
+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j) {
+	unsigned int k;
+	if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
+	if (j->code_bits < 1) return 0; // ran out of bits from stream, return 0s intead of continuing
+	k = j->code_buffer;
+	j->code_buffer <<= 1;
+	--j->code_bits;
+	return k & 0x80000000;
+}
+
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static const stbi_uc stbi__jpeg_dezigzag[64 + 15] = {
+	0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20,
+	13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59,
+	52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63,
+	// let corrupt input sample past end
+	63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63};
+
+// decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc,
+								   stbi__huffman *hac, stbi__int16 *fac, int b,
+								   stbi__uint16 *dequant) {
+	int diff, dc, k;
+	int t;
+
+	if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+	t = stbi__jpeg_huff_decode(j, hdc);
+	if (t < 0 || t > 15) return stbi__err("bad huffman code", "Corrupt JPEG");
+
+	// 0 all the ac values now so we can do it 32-bits at a time
+	memset(data, 0, 64 * sizeof(data[0]));
+
+	diff = t ? stbi__extend_receive(j, t) : 0;
+	if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff))
+		return stbi__err("bad delta", "Corrupt JPEG");
+	dc = j->img_comp[b].dc_pred + diff;
+	j->img_comp[b].dc_pred = dc;
+	if (!stbi__mul2shorts_valid(dc, dequant[0]))
+		return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+	data[0] = (short)(dc * dequant[0]);
+
+	// decode AC components, see JPEG spec
+	k = 1;
+	do {
+		unsigned int zig;
+		int c, r, s;
+		if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+		c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+		r = fac[c];
+		if (r) {				// fast-AC path
+			k += (r >> 4) & 15; // run
+			s = r & 15;			// combined length
+			if (s > j->code_bits)
+				return stbi__err("bad huffman code",
+								 "Combined length longer than code bits available");
+			j->code_buffer <<= s;
+			j->code_bits -= s;
+			// decode into unzigzag'd location
+			zig = stbi__jpeg_dezigzag[k++];
+			data[zig] = (short)((r >> 8) * dequant[zig]);
+		} else {
+			int rs = stbi__jpeg_huff_decode(j, hac);
+			if (rs < 0) return stbi__err("bad huffman code", "Corrupt JPEG");
+			s = rs & 15;
+			r = rs >> 4;
+			if (s == 0) {
+				if (rs != 0xf0) break; // end block
+				k += 16;
+			} else {
+				k += r;
+				// decode into unzigzag'd location
+				zig = stbi__jpeg_dezigzag[k++];
+				data[zig] = (short)(stbi__extend_receive(j, s) * dequant[zig]);
+			}
+		}
+	} while (k < 64);
+	return 1;
+}
+
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc,
+										   int b) {
+	int diff, dc;
+	int t;
+	if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+	if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+	if (j->succ_high == 0) {
+		// first scan for DC coefficient, must be first
+		memset(data, 0, 64 * sizeof(data[0])); // 0 all the ac values now
+		t = stbi__jpeg_huff_decode(j, hdc);
+		if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+		diff = t ? stbi__extend_receive(j, t) : 0;
+
+		if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff))
+			return stbi__err("bad delta", "Corrupt JPEG");
+		dc = j->img_comp[b].dc_pred + diff;
+		j->img_comp[b].dc_pred = dc;
+		if (!stbi__mul2shorts_valid(dc, 1 << j->succ_low))
+			return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+		data[0] = (short)(dc * (1 << j->succ_low));
+	} else {
+		// refinement scan for DC coefficient
+		if (stbi__jpeg_get_bit(j)) data[0] += (short)(1 << j->succ_low);
+	}
+	return 1;
+}
+
+// @OPTIMIZE: store non-zigzagged during the decode passes,
+// and only de-zigzag when dequantizing
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac,
+										   stbi__int16 *fac) {
+	int k;
+	if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+	if (j->succ_high == 0) {
+		int shift = j->succ_low;
+
+		if (j->eob_run) {
+			--j->eob_run;
+			return 1;
+		}
+
+		k = j->spec_start;
+		do {
+			unsigned int zig;
+			int c, r, s;
+			if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+			c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+			r = fac[c];
+			if (r) {				// fast-AC path
+				k += (r >> 4) & 15; // run
+				s = r & 15;			// combined length
+				if (s > j->code_bits)
+					return stbi__err("bad huffman code",
+									 "Combined length longer than code bits available");
+				j->code_buffer <<= s;
+				j->code_bits -= s;
+				zig = stbi__jpeg_dezigzag[k++];
+				data[zig] = (short)((r >> 8) * (1 << shift));
+			} else {
+				int rs = stbi__jpeg_huff_decode(j, hac);
+				if (rs < 0) return stbi__err("bad huffman code", "Corrupt JPEG");
+				s = rs & 15;
+				r = rs >> 4;
+				if (s == 0) {
+					if (r < 15) {
+						j->eob_run = (1 << r);
+						if (r) j->eob_run += stbi__jpeg_get_bits(j, r);
+						--j->eob_run;
+						break;
+					}
+					k += 16;
+				} else {
+					k += r;
+					zig = stbi__jpeg_dezigzag[k++];
+					data[zig] = (short)(stbi__extend_receive(j, s) * (1 << shift));
+				}
+			}
+		} while (k <= j->spec_end);
+	} else {
+		// refinement scan for these AC coefficients
+
+		short bit = (short)(1 << j->succ_low);
+
+		if (j->eob_run) {
+			--j->eob_run;
+			for (k = j->spec_start; k <= j->spec_end; ++k) {
+				short *p = &data[stbi__jpeg_dezigzag[k]];
+				if (*p != 0)
+					if (stbi__jpeg_get_bit(j))
+						if ((*p & bit) == 0) {
+							if (*p > 0)
+								*p += bit;
+							else
+								*p -= bit;
+						}
+			}
+		} else {
+			k = j->spec_start;
+			do {
+				int r, s;
+				int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast
+														 // path here, advance-by-r is so slow, eh
+				if (rs < 0) return stbi__err("bad huffman code", "Corrupt JPEG");
+				s = rs & 15;
+				r = rs >> 4;
+				if (s == 0) {
+					if (r < 15) {
+						j->eob_run = (1 << r) - 1;
+						if (r) j->eob_run += stbi__jpeg_get_bits(j, r);
+						r = 64; // force end of block
+					} else {
+						// r=15 s=0 should write 16 0s, so we just do
+						// a run of 15 0s and then write s (which is 0),
+						// so we don't have to do anything special here
+					}
+				} else {
+					if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
+					// sign bit
+					if (stbi__jpeg_get_bit(j))
+						s = bit;
+					else
+						s = -bit;
+				}
+
+				// advance by r
+				while (k <= j->spec_end) {
+					short *p = &data[stbi__jpeg_dezigzag[k++]];
+					if (*p != 0) {
+						if (stbi__jpeg_get_bit(j))
+							if ((*p & bit) == 0) {
+								if (*p > 0)
+									*p += bit;
+								else
+									*p -= bit;
+							}
+					} else {
+						if (r == 0) {
+							*p = (short)s;
+							break;
+						}
+						--r;
+					}
+				}
+			} while (k <= j->spec_end);
+		}
+	}
+	return 1;
+}
+
+// take a -128..127 value and stbi__clamp it and convert to 0..255
+stbi_inline static stbi_uc stbi__clamp(int x) {
+	// trick to use a single test to catch both cases
+	if ((unsigned int)x > 255) {
+		if (x < 0) return 0;
+		if (x > 255) return 255;
+	}
+	return (stbi_uc)x;
+}
+
+#define stbi__f2f(x) ((int)(((x) * 4096 + 0.5)))
+#define stbi__fsh(x) ((x) * 4096)
+
+// derived from jidctint -- DCT_ISLOW
+#define STBI__IDCT_1D(s0, s1, s2, s3, s4, s5, s6, s7)                                              \
+	int t0, t1, t2, t3, p1, p2, p3, p4, p5, x0, x1, x2, x3;                                        \
+	p2 = s2;                                                                                       \
+	p3 = s6;                                                                                       \
+	p1 = (p2 + p3) * stbi__f2f(0.5411961f);                                                        \
+	t2 = p1 + p3 * stbi__f2f(-1.847759065f);                                                       \
+	t3 = p1 + p2 * stbi__f2f(0.765366865f);                                                        \
+	p2 = s0;                                                                                       \
+	p3 = s4;                                                                                       \
+	t0 = stbi__fsh(p2 + p3);                                                                       \
+	t1 = stbi__fsh(p2 - p3);                                                                       \
+	x0 = t0 + t3;                                                                                  \
+	x3 = t0 - t3;                                                                                  \
+	x1 = t1 + t2;                                                                                  \
+	x2 = t1 - t2;                                                                                  \
+	t0 = s7;                                                                                       \
+	t1 = s5;                                                                                       \
+	t2 = s3;                                                                                       \
+	t3 = s1;                                                                                       \
+	p3 = t0 + t2;                                                                                  \
+	p4 = t1 + t3;                                                                                  \
+	p1 = t0 + t3;                                                                                  \
+	p2 = t1 + t2;                                                                                  \
+	p5 = (p3 + p4) * stbi__f2f(1.175875602f);                                                      \
+	t0 = t0 * stbi__f2f(0.298631336f);                                                             \
+	t1 = t1 * stbi__f2f(2.053119869f);                                                             \
+	t2 = t2 * stbi__f2f(3.072711026f);                                                             \
+	t3 = t3 * stbi__f2f(1.501321110f);                                                             \
+	p1 = p5 + p1 * stbi__f2f(-0.899976223f);                                                       \
+	p2 = p5 + p2 * stbi__f2f(-2.562915447f);                                                       \
+	p3 = p3 * stbi__f2f(-1.961570560f);                                                            \
+	p4 = p4 * stbi__f2f(-0.390180644f);                                                            \
+	t3 += p1 + p4;                                                                                 \
+	t2 += p2 + p3;                                                                                 \
+	t1 += p2 + p4;                                                                                 \
+	t0 += p1 + p3;
+
+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64]) {
+	int i, val[64], *v = val;
+	stbi_uc *o;
+	short *d = data;
+
+	// columns
+	for (i = 0; i < 8; ++i, ++d, ++v) {
+		// if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+		if (d[8] == 0 && d[16] == 0 && d[24] == 0 && d[32] == 0 && d[40] == 0 && d[48] == 0 &&
+			d[56] == 0) {
+			//    no shortcut                 0     seconds
+			//    (1|2|3|4|5|6|7)==0          0     seconds
+			//    all separate               -0.047 seconds
+			//    1 && 2|3 && 4|5 && 6|7:    -0.047 seconds
+			int dcterm = d[0] * 4;
+			v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+		} else {
+			STBI__IDCT_1D(d[0], d[8], d[16], d[24], d[32], d[40], d[48], d[56])
+			// constants scaled things up by 1<<12; let's bring them back
+			// down, but keep 2 extra bits of precision
+			x0 += 512;
+			x1 += 512;
+			x2 += 512;
+			x3 += 512;
+			v[0] = (x0 + t3) >> 10;
+			v[56] = (x0 - t3) >> 10;
+			v[8] = (x1 + t2) >> 10;
+			v[48] = (x1 - t2) >> 10;
+			v[16] = (x2 + t1) >> 10;
+			v[40] = (x2 - t1) >> 10;
+			v[24] = (x3 + t0) >> 10;
+			v[32] = (x3 - t0) >> 10;
+		}
+	}
+
+	for (i = 0, v = val, o = out; i < 8; ++i, v += 8, o += out_stride) {
+		// no fast case since the first 1D IDCT spread components out
+		STBI__IDCT_1D(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7])
+		// constants scaled things up by 1<<12, plus we had 1<<2 from first
+		// loop, plus horizontal and vertical each scale by sqrt(8) so together
+		// we've got an extra 1<<3, so 1<<17 total we need to remove.
+		// so we want to round that, which means adding 0.5 * 1<<17,
+		// aka 65536. Also, we'll end up with -128 to 127 that we want
+		// to encode as 0..255 by adding 128, so we'll add that before the shift
+		x0 += 65536 + (128 << 17);
+		x1 += 65536 + (128 << 17);
+		x2 += 65536 + (128 << 17);
+		x3 += 65536 + (128 << 17);
+		// tried computing the shifts into temps, or'ing the temps to see
+		// if any were out of range, but that was slower
+		o[0] = stbi__clamp((x0 + t3) >> 17);
+		o[7] = stbi__clamp((x0 - t3) >> 17);
+		o[1] = stbi__clamp((x1 + t2) >> 17);
+		o[6] = stbi__clamp((x1 - t2) >> 17);
+		o[2] = stbi__clamp((x2 + t1) >> 17);
+		o[5] = stbi__clamp((x2 - t1) >> 17);
+		o[3] = stbi__clamp((x3 + t0) >> 17);
+		o[4] = stbi__clamp((x3 - t0) >> 17);
+	}
+}
+
+#ifdef STBI_SSE2
+// sse2 integer IDCT. not the fastest possible implementation but it
+// produces bit-identical results to the generic C version so it's
+// fully "transparent".
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) {
+	// This is constructed to match our regular (generic) integer IDCT exactly.
+	__m128i row0, row1, row2, row3, row4, row5, row6, row7;
+	__m128i tmp;
+
+// dot product constant: even elems=x, odd elems=y
+#define dct_const(x, y) _mm_setr_epi16((x), (y), (x), (y), (x), (y), (x), (y))
+
+// out(0) = c0[even]*x + c0[odd]*y   (c0, x, y 16-bit, out 32-bit)
+// out(1) = c1[even]*x + c1[odd]*y
+#define dct_rot(out0, out1, x, y, c0, c1)                                                          \
+	__m128i c0##lo = _mm_unpacklo_epi16((x), (y));                                                 \
+	__m128i c0##hi = _mm_unpackhi_epi16((x), (y));                                                 \
+	__m128i out0##_l = _mm_madd_epi16(c0##lo, c0);                                                 \
+	__m128i out0##_h = _mm_madd_epi16(c0##hi, c0);                                                 \
+	__m128i out1##_l = _mm_madd_epi16(c0##lo, c1);                                                 \
+	__m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+
+// out = in << 12  (in 16-bit, out 32-bit)
+#define dct_widen(out, in)                                                                         \
+	__m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4);            \
+	__m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+
+// wide add
+#define dct_wadd(out, a, b)                                                                        \
+	__m128i out##_l = _mm_add_epi32(a##_l, b##_l);                                                 \
+	__m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b)                                                                        \
+	__m128i out##_l = _mm_sub_epi32(a##_l, b##_l);                                                 \
+	__m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+
+// butterfly a/b, add bias, then shift by "s" and pack
+#define dct_bfly32o(out0, out1, a, b, bias, s)                                                     \
+	{                                                                                              \
+		__m128i abiased_l = _mm_add_epi32(a##_l, bias);                                            \
+		__m128i abiased_h = _mm_add_epi32(a##_h, bias);                                            \
+		dct_wadd(sum, abiased, b);                                                                 \
+		dct_wsub(dif, abiased, b);                                                                 \
+		out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s));                \
+		out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s));                \
+	}
+
+// 8-bit interleave step (for transposes)
+#define dct_interleave8(a, b)                                                                      \
+	tmp = a;                                                                                       \
+	a = _mm_unpacklo_epi8(a, b);                                                                   \
+	b = _mm_unpackhi_epi8(tmp, b)
+
+// 16-bit interleave step (for transposes)
+#define dct_interleave16(a, b)                                                                     \
+	tmp = a;                                                                                       \
+	a = _mm_unpacklo_epi16(a, b);                                                                  \
+	b = _mm_unpackhi_epi16(tmp, b)
+
+#define dct_pass(bias, shift)                                                                      \
+	{                                                                                              \
+		/* even part */                                                                            \
+		dct_rot(t2e, t3e, row2, row6, rot0_0, rot0_1);                                             \
+		__m128i sum04 = _mm_add_epi16(row0, row4);                                                 \
+		__m128i dif04 = _mm_sub_epi16(row0, row4);                                                 \
+		dct_widen(t0e, sum04);                                                                     \
+		dct_widen(t1e, dif04);                                                                     \
+		dct_wadd(x0, t0e, t3e);                                                                    \
+		dct_wsub(x3, t0e, t3e);                                                                    \
+		dct_wadd(x1, t1e, t2e);                                                                    \
+		dct_wsub(x2, t1e, t2e);                                                                    \
+		/* odd part */                                                                             \
+		dct_rot(y0o, y2o, row7, row3, rot2_0, rot2_1);                                             \
+		dct_rot(y1o, y3o, row5, row1, rot3_0, rot3_1);                                             \
+		__m128i sum17 = _mm_add_epi16(row1, row7);                                                 \
+		__m128i sum35 = _mm_add_epi16(row3, row5);                                                 \
+		dct_rot(y4o, y5o, sum17, sum35, rot1_0, rot1_1);                                           \
+		dct_wadd(x4, y0o, y4o);                                                                    \
+		dct_wadd(x5, y1o, y5o);                                                                    \
+		dct_wadd(x6, y2o, y5o);                                                                    \
+		dct_wadd(x7, y3o, y4o);                                                                    \
+		dct_bfly32o(row0, row7, x0, x7, bias, shift);                                              \
+		dct_bfly32o(row1, row6, x1, x6, bias, shift);                                              \
+		dct_bfly32o(row2, row5, x2, x5, bias, shift);                                              \
+		dct_bfly32o(row3, row4, x3, x4, bias, shift);                                              \
+	}
+
+	__m128i rot0_0 =
+		dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+	__m128i rot0_1 =
+		dct_const(stbi__f2f(0.5411961f) + stbi__f2f(0.765366865f), stbi__f2f(0.5411961f));
+	__m128i rot1_0 =
+		dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
+	__m128i rot1_1 =
+		dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+	__m128i rot2_0 =
+		dct_const(stbi__f2f(-1.961570560f) + stbi__f2f(0.298631336f), stbi__f2f(-1.961570560f));
+	__m128i rot2_1 =
+		dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f(3.072711026f));
+	__m128i rot3_0 =
+		dct_const(stbi__f2f(-0.390180644f) + stbi__f2f(2.053119869f), stbi__f2f(-0.390180644f));
+	__m128i rot3_1 =
+		dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f(1.501321110f));
+
+	// rounding biases in column/row passes, see stbi__idct_block for
+	// explanation.
+	__m128i bias_0 = _mm_set1_epi32(512);
+	__m128i bias_1 = _mm_set1_epi32(65536 + (128 << 17));
+
+	// load
+	row0 = _mm_load_si128((const __m128i *)(data + 0 * 8));
+	row1 = _mm_load_si128((const __m128i *)(data + 1 * 8));
+	row2 = _mm_load_si128((const __m128i *)(data + 2 * 8));
+	row3 = _mm_load_si128((const __m128i *)(data + 3 * 8));
+	row4 = _mm_load_si128((const __m128i *)(data + 4 * 8));
+	row5 = _mm_load_si128((const __m128i *)(data + 5 * 8));
+	row6 = _mm_load_si128((const __m128i *)(data + 6 * 8));
+	row7 = _mm_load_si128((const __m128i *)(data + 7 * 8));
+
+	// column pass
+	dct_pass(bias_0, 10);
+
+	{
+		// 16bit 8x8 transpose pass 1
+		dct_interleave16(row0, row4);
+		dct_interleave16(row1, row5);
+		dct_interleave16(row2, row6);
+		dct_interleave16(row3, row7);
+
+		// transpose pass 2
+		dct_interleave16(row0, row2);
+		dct_interleave16(row1, row3);
+		dct_interleave16(row4, row6);
+		dct_interleave16(row5, row7);
+
+		// transpose pass 3
+		dct_interleave16(row0, row1);
+		dct_interleave16(row2, row3);
+		dct_interleave16(row4, row5);
+		dct_interleave16(row6, row7);
+	}
+
+	// row pass
+	dct_pass(bias_1, 17);
+
+	{
+		// pack
+		__m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+		__m128i p1 = _mm_packus_epi16(row2, row3);
+		__m128i p2 = _mm_packus_epi16(row4, row5);
+		__m128i p3 = _mm_packus_epi16(row6, row7);
+
+		// 8bit 8x8 transpose pass 1
+		dct_interleave8(p0, p2); // a0e0a1e1...
+		dct_interleave8(p1, p3); // c0g0c1g1...
+
+		// transpose pass 2
+		dct_interleave8(p0, p1); // a0c0e0g0...
+		dct_interleave8(p2, p3); // b0d0f0h0...
+
+		// transpose pass 3
+		dct_interleave8(p0, p2); // a0b0c0d0...
+		dct_interleave8(p1, p3); // a4b4c4d4...
+
+		// store
+		_mm_storel_epi64((__m128i *)out, p0);
+		out += out_stride;
+		_mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p0, 0x4e));
+		out += out_stride;
+		_mm_storel_epi64((__m128i *)out, p2);
+		out += out_stride;
+		_mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p2, 0x4e));
+		out += out_stride;
+		_mm_storel_epi64((__m128i *)out, p1);
+		out += out_stride;
+		_mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p1, 0x4e));
+		out += out_stride;
+		_mm_storel_epi64((__m128i *)out, p3);
+		out += out_stride;
+		_mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p3, 0x4e));
+	}
+
+#undef dct_const
+#undef dct_rot
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_interleave8
+#undef dct_interleave16
+#undef dct_pass
+}
+
+#endif // STBI_SSE2
+
+#ifdef STBI_NEON
+
+// NEON integer IDCT. should produce bit-identical
+// results to the generic C version.
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) {
+	int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+
+	int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+	int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+	int16x4_t rot0_2 = vdup_n_s16(stbi__f2f(0.765366865f));
+	int16x4_t rot1_0 = vdup_n_s16(stbi__f2f(1.175875602f));
+	int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+	int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+	int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+	int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+	int16x4_t rot3_0 = vdup_n_s16(stbi__f2f(0.298631336f));
+	int16x4_t rot3_1 = vdup_n_s16(stbi__f2f(2.053119869f));
+	int16x4_t rot3_2 = vdup_n_s16(stbi__f2f(3.072711026f));
+	int16x4_t rot3_3 = vdup_n_s16(stbi__f2f(1.501321110f));
+
+#define dct_long_mul(out, inq, coeff)                                                              \
+	int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff);                                       \
+	int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+
+#define dct_long_mac(out, acc, inq, coeff)                                                         \
+	int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff);                              \
+	int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+
+#define dct_widen(out, inq)                                                                        \
+	int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12);                                        \
+	int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+
+// wide add
+#define dct_wadd(out, a, b)                                                                        \
+	int32x4_t out##_l = vaddq_s32(a##_l, b##_l);                                                   \
+	int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b)                                                                        \
+	int32x4_t out##_l = vsubq_s32(a##_l, b##_l);                                                   \
+	int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+
+// butterfly a/b, then shift using "shiftop" by "s" and pack
+#define dct_bfly32o(out0, out1, a, b, shiftop, s)                                                  \
+	{                                                                                              \
+		dct_wadd(sum, a, b);                                                                       \
+		dct_wsub(dif, a, b);                                                                       \
+		out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s));                                 \
+		out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s));                                 \
+	}
+
+#define dct_pass(shiftop, shift)                                                                   \
+	{                                                                                              \
+		/* even part */                                                                            \
+		int16x8_t sum26 = vaddq_s16(row2, row6);                                                   \
+		dct_long_mul(p1e, sum26, rot0_0);                                                          \
+		dct_long_mac(t2e, p1e, row6, rot0_1);                                                      \
+		dct_long_mac(t3e, p1e, row2, rot0_2);                                                      \
+		int16x8_t sum04 = vaddq_s16(row0, row4);                                                   \
+		int16x8_t dif04 = vsubq_s16(row0, row4);                                                   \
+		dct_widen(t0e, sum04);                                                                     \
+		dct_widen(t1e, dif04);                                                                     \
+		dct_wadd(x0, t0e, t3e);                                                                    \
+		dct_wsub(x3, t0e, t3e);                                                                    \
+		dct_wadd(x1, t1e, t2e);                                                                    \
+		dct_wsub(x2, t1e, t2e);                                                                    \
+		/* odd part */                                                                             \
+		int16x8_t sum15 = vaddq_s16(row1, row5);                                                   \
+		int16x8_t sum17 = vaddq_s16(row1, row7);                                                   \
+		int16x8_t sum35 = vaddq_s16(row3, row5);                                                   \
+		int16x8_t sum37 = vaddq_s16(row3, row7);                                                   \
+		int16x8_t sumodd = vaddq_s16(sum17, sum35);                                                \
+		dct_long_mul(p5o, sumodd, rot1_0);                                                         \
+		dct_long_mac(p1o, p5o, sum17, rot1_1);                                                     \
+		dct_long_mac(p2o, p5o, sum35, rot1_2);                                                     \
+		dct_long_mul(p3o, sum37, rot2_0);                                                          \
+		dct_long_mul(p4o, sum15, rot2_1);                                                          \
+		dct_wadd(sump13o, p1o, p3o);                                                               \
+		dct_wadd(sump24o, p2o, p4o);                                                               \
+		dct_wadd(sump23o, p2o, p3o);                                                               \
+		dct_wadd(sump14o, p1o, p4o);                                                               \
+		dct_long_mac(x4, sump13o, row7, rot3_0);                                                   \
+		dct_long_mac(x5, sump24o, row5, rot3_1);                                                   \
+		dct_long_mac(x6, sump23o, row3, rot3_2);                                                   \
+		dct_long_mac(x7, sump14o, row1, rot3_3);                                                   \
+		dct_bfly32o(row0, row7, x0, x7, shiftop, shift);                                           \
+		dct_bfly32o(row1, row6, x1, x6, shiftop, shift);                                           \
+		dct_bfly32o(row2, row5, x2, x5, shiftop, shift);                                           \
+		dct_bfly32o(row3, row4, x3, x4, shiftop, shift);                                           \
+	}
+
+	// load
+	row0 = vld1q_s16(data + 0 * 8);
+	row1 = vld1q_s16(data + 1 * 8);
+	row2 = vld1q_s16(data + 2 * 8);
+	row3 = vld1q_s16(data + 3 * 8);
+	row4 = vld1q_s16(data + 4 * 8);
+	row5 = vld1q_s16(data + 5 * 8);
+	row6 = vld1q_s16(data + 6 * 8);
+	row7 = vld1q_s16(data + 7 * 8);
+
+	// add DC bias
+	row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+
+	// column pass
+	dct_pass(vrshrn_n_s32, 10);
+
+	// 16bit 8x8 transpose
+	{
+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
+// whether compilers actually get this is another story, sadly.
+#define dct_trn16(x, y)                                                                            \
+	{                                                                                              \
+		int16x8x2_t t = vtrnq_s16(x, y);                                                           \
+		x = t.val[0];                                                                              \
+		y = t.val[1];                                                                              \
+	}
+#define dct_trn32(x, y)                                                                            \
+	{                                                                                              \
+		int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y));             \
+		x = vreinterpretq_s16_s32(t.val[0]);                                                       \
+		y = vreinterpretq_s16_s32(t.val[1]);                                                       \
+	}
+#define dct_trn64(x, y)                                                                            \
+	{                                                                                              \
+		int16x8_t x0 = x;                                                                          \
+		int16x8_t y0 = y;                                                                          \
+		x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0));                                      \
+		y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0));                                    \
+	}
+
+		// pass 1
+		dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+		dct_trn16(row2, row3);
+		dct_trn16(row4, row5);
+		dct_trn16(row6, row7);
+
+		// pass 2
+		dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+		dct_trn32(row1, row3);
+		dct_trn32(row4, row6);
+		dct_trn32(row5, row7);
+
+		// pass 3
+		dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+		dct_trn64(row1, row5);
+		dct_trn64(row2, row6);
+		dct_trn64(row3, row7);
+
+#undef dct_trn16
+#undef dct_trn32
+#undef dct_trn64
+	}
+
+	// row pass
+	// vrshrn_n_s32 only supports shifts up to 16, we need
+	// 17. so do a non-rounding shift of 16 first then follow
+	// up with a rounding shift by 1.
+	dct_pass(vshrn_n_s32, 16);
+
+	{
+		// pack and round
+		uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+		uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+		uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+		uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+		uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+		uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+		uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+		uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+
+		// again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y)                                                                           \
+	{                                                                                              \
+		uint8x8x2_t t = vtrn_u8(x, y);                                                             \
+		x = t.val[0];                                                                              \
+		y = t.val[1];                                                                              \
+	}
+#define dct_trn8_16(x, y)                                                                          \
+	{                                                                                              \
+		uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y));                 \
+		x = vreinterpret_u8_u16(t.val[0]);                                                         \
+		y = vreinterpret_u8_u16(t.val[1]);                                                         \
+	}
+#define dct_trn8_32(x, y)                                                                          \
+	{                                                                                              \
+		uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y));                 \
+		x = vreinterpret_u8_u32(t.val[0]);                                                         \
+		y = vreinterpret_u8_u32(t.val[1]);                                                         \
+	}
+
+		// sadly can't use interleaved stores here since we only write
+		// 8 bytes to each scan line!
+
+		// 8x8 8-bit transpose pass 1
+		dct_trn8_8(p0, p1);
+		dct_trn8_8(p2, p3);
+		dct_trn8_8(p4, p5);
+		dct_trn8_8(p6, p7);
+
+		// pass 2
+		dct_trn8_16(p0, p2);
+		dct_trn8_16(p1, p3);
+		dct_trn8_16(p4, p6);
+		dct_trn8_16(p5, p7);
+
+		// pass 3
+		dct_trn8_32(p0, p4);
+		dct_trn8_32(p1, p5);
+		dct_trn8_32(p2, p6);
+		dct_trn8_32(p3, p7);
+
+		// store
+		vst1_u8(out, p0);
+		out += out_stride;
+		vst1_u8(out, p1);
+		out += out_stride;
+		vst1_u8(out, p2);
+		out += out_stride;
+		vst1_u8(out, p3);
+		out += out_stride;
+		vst1_u8(out, p4);
+		out += out_stride;
+		vst1_u8(out, p5);
+		out += out_stride;
+		vst1_u8(out, p6);
+		out += out_stride;
+		vst1_u8(out, p7);
+
+#undef dct_trn8_8
+#undef dct_trn8_16
+#undef dct_trn8_32
+	}
+
+#undef dct_long_mul
+#undef dct_long_mac
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_pass
+}
+
+#endif // STBI_NEON
+
+#define STBI__MARKER_none 0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static stbi_uc stbi__get_marker(stbi__jpeg *j) {
+	stbi_uc x;
+	if (j->marker != STBI__MARKER_none) {
+		x = j->marker;
+		j->marker = STBI__MARKER_none;
+		return x;
+	}
+	x = stbi__get8(j->s);
+	if (x != 0xff) return STBI__MARKER_none;
+	while (x == 0xff) x = stbi__get8(j->s); // consume repeated 0xff fill bytes
+	return x;
+}
+
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
+
+// after a restart interval, stbi__jpeg_reset the entropy decoder and
+// the dc prediction
+static void stbi__jpeg_reset(stbi__jpeg *j) {
+	j->code_bits = 0;
+	j->code_buffer = 0;
+	j->nomore = 0;
+	j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred =
+		j->img_comp[3].dc_pred = 0;
+	j->marker = STBI__MARKER_none;
+	j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+	j->eob_run = 0;
+	// no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+	// since we don't even allow 1<<30 pixels
+}
+
+static int stbi__parse_entropy_coded_data(stbi__jpeg *z) {
+	stbi__jpeg_reset(z);
+	if (!z->progressive) {
+		if (z->scan_n == 1) {
+			int i, j;
+			STBI_SIMD_ALIGN(short, data[64]);
+			int n = z->order[0];
+			// non-interleaved data, we just need to process one block at a
+			// time, in trivial scanline order number of blocks to do just
+			// depends on how many actual "pixels" this component has,
+			// independent of interleaved MCU blocking and such
+			int w = (z->img_comp[n].x + 7) >> 3;
+			int h = (z->img_comp[n].y + 7) >> 3;
+			for (j = 0; j < h; ++j) {
+				for (i = 0; i < w; ++i) {
+					int ha = z->img_comp[n].ha;
+					if (!stbi__jpeg_decode_block(z, data, z->huff_dc + z->img_comp[n].hd,
+												 z->huff_ac + ha, z->fast_ac[ha], n,
+												 z->dequant[z->img_comp[n].tq]))
+						return 0;
+					z->idct_block_kernel(z->img_comp[n].data + z->img_comp[n].w2 * j * 8 + i * 8,
+										 z->img_comp[n].w2, data);
+					// every data block is an MCU, so countdown the restart
+					// interval
+					if (--z->todo <= 0) {
+						if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+						// if it's NOT a restart, then just bail, so we get
+						// corrupt data rather than no data
+						if (!STBI__RESTART(z->marker)) return 1;
+						stbi__jpeg_reset(z);
+					}
+				}
+			}
+			return 1;
+		} else { // interleaved
+			int i, j, k, x, y;
+			STBI_SIMD_ALIGN(short, data[64]);
+			for (j = 0; j < z->img_mcu_y; ++j) {
+				for (i = 0; i < z->img_mcu_x; ++i) {
+					// scan an interleaved mcu... process scan_n components in
+					// order
+					for (k = 0; k < z->scan_n; ++k) {
+						int n = z->order[k];
+						// scan out an mcu's worth of this component; that's
+						// just determined by the basic H and V specified for
+						// the component
+						for (y = 0; y < z->img_comp[n].v; ++y) {
+							for (x = 0; x < z->img_comp[n].h; ++x) {
+								int x2 = (i * z->img_comp[n].h + x) * 8;
+								int y2 = (j * z->img_comp[n].v + y) * 8;
+								int ha = z->img_comp[n].ha;
+								if (!stbi__jpeg_decode_block(
+										z, data, z->huff_dc + z->img_comp[n].hd, z->huff_ac + ha,
+										z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq]))
+									return 0;
+								z->idct_block_kernel(z->img_comp[n].data + z->img_comp[n].w2 * y2 +
+														 x2,
+													 z->img_comp[n].w2, data);
+							}
+						}
+					}
+					// after all interleaved components, that's an interleaved
+					// MCU, so now count down the restart interval
+					if (--z->todo <= 0) {
+						if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+						if (!STBI__RESTART(z->marker)) return 1;
+						stbi__jpeg_reset(z);
+					}
+				}
+			}
+			return 1;
+		}
+	} else {
+		if (z->scan_n == 1) {
+			int i, j;
+			int n = z->order[0];
+			// non-interleaved data, we just need to process one block at a
+			// time, in trivial scanline order number of blocks to do just
+			// depends on how many actual "pixels" this component has,
+			// independent of interleaved MCU blocking and such
+			int w = (z->img_comp[n].x + 7) >> 3;
+			int h = (z->img_comp[n].y + 7) >> 3;
+			for (j = 0; j < h; ++j) {
+				for (i = 0; i < w; ++i) {
+					short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+					if (z->spec_start == 0) {
+						if (!stbi__jpeg_decode_block_prog_dc(z, data,
+															 &z->huff_dc[z->img_comp[n].hd], n))
+							return 0;
+					} else {
+						int ha = z->img_comp[n].ha;
+						if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha],
+															 z->fast_ac[ha]))
+							return 0;
+					}
+					// every data block is an MCU, so countdown the restart
+					// interval
+					if (--z->todo <= 0) {
+						if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+						if (!STBI__RESTART(z->marker)) return 1;
+						stbi__jpeg_reset(z);
+					}
+				}
+			}
+			return 1;
+		} else { // interleaved
+			int i, j, k, x, y;
+			for (j = 0; j < z->img_mcu_y; ++j) {
+				for (i = 0; i < z->img_mcu_x; ++i) {
+					// scan an interleaved mcu... process scan_n components in
+					// order
+					for (k = 0; k < z->scan_n; ++k) {
+						int n = z->order[k];
+						// scan out an mcu's worth of this component; that's
+						// just determined by the basic H and V specified for
+						// the component
+						for (y = 0; y < z->img_comp[n].v; ++y) {
+							for (x = 0; x < z->img_comp[n].h; ++x) {
+								int x2 = (i * z->img_comp[n].h + x);
+								int y2 = (j * z->img_comp[n].v + y);
+								short *data =
+									z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+								if (!stbi__jpeg_decode_block_prog_dc(
+										z, data, &z->huff_dc[z->img_comp[n].hd], n))
+									return 0;
+							}
+						}
+					}
+					// after all interleaved components, that's an interleaved
+					// MCU, so now count down the restart interval
+					if (--z->todo <= 0) {
+						if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+						if (!STBI__RESTART(z->marker)) return 1;
+						stbi__jpeg_reset(z);
+					}
+				}
+			}
+			return 1;
+		}
+	}
+}
+
+static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant) {
+	int i;
+	for (i = 0; i < 64; ++i) data[i] *= dequant[i];
+}
+
+static void stbi__jpeg_finish(stbi__jpeg *z) {
+	if (z->progressive) {
+		// dequantize and idct the data
+		int i, j, n;
+		for (n = 0; n < z->s->img_n; ++n) {
+			int w = (z->img_comp[n].x + 7) >> 3;
+			int h = (z->img_comp[n].y + 7) >> 3;
+			for (j = 0; j < h; ++j) {
+				for (i = 0; i < w; ++i) {
+					short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+					stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+					z->idct_block_kernel(z->img_comp[n].data + z->img_comp[n].w2 * j * 8 + i * 8,
+										 z->img_comp[n].w2, data);
+				}
+			}
+		}
+	}
+}
+
+static int stbi__process_marker(stbi__jpeg *z, int m) {
+	int L;
+	switch (m) {
+	case STBI__MARKER_none: // no marker found
+		return stbi__err("expected marker", "Corrupt JPEG");
+
+	case 0xDD: // DRI - specify restart interval
+		if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len", "Corrupt JPEG");
+		z->restart_interval = stbi__get16be(z->s);
+		return 1;
+
+	case 0xDB: // DQT - define quantization table
+		L = stbi__get16be(z->s) - 2;
+		while (L > 0) {
+			int q = stbi__get8(z->s);
+			int p = q >> 4, sixteen = (p != 0);
+			int t = q & 15, i;
+			if (p != 0 && p != 1) return stbi__err("bad DQT type", "Corrupt JPEG");
+			if (t > 3) return stbi__err("bad DQT table", "Corrupt JPEG");
+
+			for (i = 0; i < 64; ++i)
+				z->dequant[t][stbi__jpeg_dezigzag[i]] =
+					(stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s));
+			L -= (sixteen ? 129 : 65);
+		}
+		return L == 0;
+
+	case 0xC4: // DHT - define huffman table
+		L = stbi__get16be(z->s) - 2;
+		while (L > 0) {
+			stbi_uc *v;
+			int sizes[16], i, n = 0;
+			int q = stbi__get8(z->s);
+			int tc = q >> 4;
+			int th = q & 15;
+			if (tc > 1 || th > 3) return stbi__err("bad DHT header", "Corrupt JPEG");
+			for (i = 0; i < 16; ++i) {
+				sizes[i] = stbi__get8(z->s);
+				n += sizes[i];
+			}
+			if (n > 256)
+				return stbi__err("bad DHT header",
+								 "Corrupt JPEG"); // Loop over i < n would write
+												  // past end of values!
+			L -= 17;
+			if (tc == 0) {
+				if (!stbi__build_huffman(z->huff_dc + th, sizes)) return 0;
+				v = z->huff_dc[th].values;
+			} else {
+				if (!stbi__build_huffman(z->huff_ac + th, sizes)) return 0;
+				v = z->huff_ac[th].values;
+			}
+			for (i = 0; i < n; ++i) v[i] = stbi__get8(z->s);
+			if (tc != 0) stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+			L -= n;
+		}
+		return L == 0;
+	}
+
+	// check for comment block or APP blocks
+	if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+		L = stbi__get16be(z->s);
+		if (L < 2) {
+			if (m == 0xFE)
+				return stbi__err("bad COM len", "Corrupt JPEG");
+			else
+				return stbi__err("bad APP len", "Corrupt JPEG");
+		}
+		L -= 2;
+
+		if (m == 0xE0 && L >= 5) { // JFIF APP0 segment
+			static const unsigned char tag[5] = {'J', 'F', 'I', 'F', '\0'};
+			int ok = 1;
+			int i;
+			for (i = 0; i < 5; ++i)
+				if (stbi__get8(z->s) != tag[i]) ok = 0;
+			L -= 5;
+			if (ok) z->jfif = 1;
+		} else if (m == 0xEE && L >= 12) { // Adobe APP14 segment
+			static const unsigned char tag[6] = {'A', 'd', 'o', 'b', 'e', '\0'};
+			int ok = 1;
+			int i;
+			for (i = 0; i < 6; ++i)
+				if (stbi__get8(z->s) != tag[i]) ok = 0;
+			L -= 6;
+			if (ok) {
+				stbi__get8(z->s);							 // version
+				stbi__get16be(z->s);						 // flags0
+				stbi__get16be(z->s);						 // flags1
+				z->app14_color_transform = stbi__get8(z->s); // color transform
+				L -= 6;
+			}
+		}
+
+		stbi__skip(z->s, L);
+		return 1;
+	}
+
+	return stbi__err("unknown marker", "Corrupt JPEG");
+}
+
+// after we see SOS
+static int stbi__process_scan_header(stbi__jpeg *z) {
+	int i;
+	int Ls = stbi__get16be(z->s);
+	z->scan_n = stbi__get8(z->s);
+	if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int)z->s->img_n)
+		return stbi__err("bad SOS component count", "Corrupt JPEG");
+	if (Ls != 6 + 2 * z->scan_n) return stbi__err("bad SOS len", "Corrupt JPEG");
+	for (i = 0; i < z->scan_n; ++i) {
+		int id = stbi__get8(z->s), which;
+		int q = stbi__get8(z->s);
+		for (which = 0; which < z->s->img_n; ++which)
+			if (z->img_comp[which].id == id) break;
+		if (which == z->s->img_n) return 0; // no match
+		z->img_comp[which].hd = q >> 4;
+		if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff", "Corrupt JPEG");
+		z->img_comp[which].ha = q & 15;
+		if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff", "Corrupt JPEG");
+		z->order[i] = which;
+	}
+
+	{
+		int aa;
+		z->spec_start = stbi__get8(z->s);
+		z->spec_end = stbi__get8(z->s); // should be 63, but might be 0
+		aa = stbi__get8(z->s);
+		z->succ_high = (aa >> 4);
+		z->succ_low = (aa & 15);
+		if (z->progressive) {
+			if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end ||
+				z->succ_high > 13 || z->succ_low > 13)
+				return stbi__err("bad SOS", "Corrupt JPEG");
+		} else {
+			if (z->spec_start != 0) return stbi__err("bad SOS", "Corrupt JPEG");
+			if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS", "Corrupt JPEG");
+			z->spec_end = 63;
+		}
+	}
+
+	return 1;
+}
+
+static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why) {
+	int i;
+	for (i = 0; i < ncomp; ++i) {
+		if (z->img_comp[i].raw_data) {
+			STBI_FREE(z->img_comp[i].raw_data);
+			z->img_comp[i].raw_data = NULL;
+			z->img_comp[i].data = NULL;
+		}
+		if (z->img_comp[i].raw_coeff) {
+			STBI_FREE(z->img_comp[i].raw_coeff);
+			z->img_comp[i].raw_coeff = 0;
+			z->img_comp[i].coeff = 0;
+		}
+		if (z->img_comp[i].linebuf) {
+			STBI_FREE(z->img_comp[i].linebuf);
+			z->img_comp[i].linebuf = NULL;
+		}
+	}
+	return why;
+}
+
+static int stbi__process_frame_header(stbi__jpeg *z, int scan) {
+	stbi__context *s = z->s;
+	int Lf, p, i, q, h_max = 1, v_max = 1, c;
+	Lf = stbi__get16be(s);
+	if (Lf < 11) return stbi__err("bad SOF len", "Corrupt JPEG"); // JPEG
+	p = stbi__get8(s);
+	if (p != 8)
+		return stbi__err("only 8-bit",
+						 "JPEG format not supported: 8-bit only"); // JPEG baseline
+	s->img_y = stbi__get16be(s);
+	if (s->img_y == 0)
+		return stbi__err("no header height",
+						 "JPEG format not supported: delayed height"); // Legal, but we don't
+																	   // handle it--but
+																	   // neither does IJG
+	s->img_x = stbi__get16be(s);
+	if (s->img_x == 0) return stbi__err("0 width", "Corrupt JPEG"); // JPEG requires
+	if (s->img_y > STBI_MAX_DIMENSIONS)
+		return stbi__err("too large", "Very large image (corrupt?)");
+	if (s->img_x > STBI_MAX_DIMENSIONS)
+		return stbi__err("too large", "Very large image (corrupt?)");
+	c = stbi__get8(s);
+	if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count", "Corrupt JPEG");
+	s->img_n = c;
+	for (i = 0; i < c; ++i) {
+		z->img_comp[i].data = NULL;
+		z->img_comp[i].linebuf = NULL;
+	}
+
+	if (Lf != 8 + 3 * s->img_n) return stbi__err("bad SOF len", "Corrupt JPEG");
+
+	z->rgb = 0;
+	for (i = 0; i < s->img_n; ++i) {
+		static const unsigned char rgb[3] = {'R', 'G', 'B'};
+		z->img_comp[i].id = stbi__get8(s);
+		if (s->img_n == 3 && z->img_comp[i].id == rgb[i]) ++z->rgb;
+		q = stbi__get8(s);
+		z->img_comp[i].h = (q >> 4);
+		if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H", "Corrupt JPEG");
+		z->img_comp[i].v = q & 15;
+		if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V", "Corrupt JPEG");
+		z->img_comp[i].tq = stbi__get8(s);
+		if (z->img_comp[i].tq > 3) return stbi__err("bad TQ", "Corrupt JPEG");
+	}
+
+	if (scan != STBI__SCAN_load) return 1;
+
+	if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0))
+		return stbi__err("too large", "Image too large to decode");
+
+	for (i = 0; i < s->img_n; ++i) {
+		if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
+		if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
+	}
+
+	// check that plane subsampling factors are integer ratios; our resamplers
+	// can't deal with fractional ratios and I've never seen a non-corrupted
+	// JPEG file actually use them
+	for (i = 0; i < s->img_n; ++i) {
+		if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H", "Corrupt JPEG");
+		if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V", "Corrupt JPEG");
+	}
+
+	// compute interleaved mcu info
+	z->img_h_max = h_max;
+	z->img_v_max = v_max;
+	z->img_mcu_w = h_max * 8;
+	z->img_mcu_h = v_max * 8;
+	// these sizes can't be more than 17 bits
+	z->img_mcu_x = (s->img_x + z->img_mcu_w - 1) / z->img_mcu_w;
+	z->img_mcu_y = (s->img_y + z->img_mcu_h - 1) / z->img_mcu_h;
+
+	for (i = 0; i < s->img_n; ++i) {
+		// number of effective pixels (e.g. for non-interleaved MCU)
+		z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max - 1) / h_max;
+		z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max - 1) / v_max;
+		// to simplify generation, we'll allocate enough memory to decode
+		// the bogus oversized data from using interleaved MCUs and their
+		// big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+		// discard the extra data until colorspace conversion
+		//
+		// img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked
+		// earlier) so these muls can't overflow with 32-bit ints (which we
+		// require)
+		z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+		z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+		z->img_comp[i].coeff = 0;
+		z->img_comp[i].raw_coeff = 0;
+		z->img_comp[i].linebuf = NULL;
+		z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
+		if (z->img_comp[i].raw_data == NULL)
+			return stbi__free_jpeg_components(z, i + 1, stbi__err("outofmem", "Out of memory"));
+		// align blocks for idct using mmx/sse
+		z->img_comp[i].data = (stbi_uc *)(((size_t)z->img_comp[i].raw_data + 15) & ~15);
+		if (z->progressive) {
+			// w2, h2 are multiples of 8 (see above)
+			z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
+			z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
+			z->img_comp[i].raw_coeff =
+				stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
+			if (z->img_comp[i].raw_coeff == NULL)
+				return stbi__free_jpeg_components(z, i + 1, stbi__err("outofmem", "Out of memory"));
+			z->img_comp[i].coeff = (short *)(((size_t)z->img_comp[i].raw_coeff + 15) & ~15);
+		}
+	}
+
+	return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define stbi__DNL(x) ((x) == 0xdc)
+#define stbi__SOI(x) ((x) == 0xd8)
+#define stbi__EOI(x) ((x) == 0xd9)
+#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x) ((x) == 0xda)
+
+#define stbi__SOF_progressive(x) ((x) == 0xc2)
+
+static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) {
+	int m;
+	z->jfif = 0;
+	z->app14_color_transform = -1; // valid values are 0,1,2
+	z->marker = STBI__MARKER_none; // initialize cached marker to empty
+	m = stbi__get_marker(z);
+	if (!stbi__SOI(m)) return stbi__err("no SOI", "Corrupt JPEG");
+	if (scan == STBI__SCAN_type) return 1;
+	m = stbi__get_marker(z);
+	while (!stbi__SOF(m)) {
+		if (!stbi__process_marker(z, m)) return 0;
+		m = stbi__get_marker(z);
+		while (m == STBI__MARKER_none) {
+			// some files have extra padding after their blocks, so ok, we'll
+			// scan
+			if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
+			m = stbi__get_marker(z);
+		}
+	}
+	z->progressive = stbi__SOF_progressive(m);
+	if (!stbi__process_frame_header(z, scan)) return 0;
+	return 1;
+}
+
+static stbi_uc stbi__skip_jpeg_junk_at_end(stbi__jpeg *j) {
+	// some JPEGs have junk at end, skip over it but if we find what looks
+	// like a valid marker, resume there
+	while (!stbi__at_eof(j->s)) {
+		stbi_uc x = stbi__get8(j->s);
+		while (x == 0xff) { // might be a marker
+			if (stbi__at_eof(j->s)) return STBI__MARKER_none;
+			x = stbi__get8(j->s);
+			if (x != 0x00 && x != 0xff) {
+				// not a stuffed zero or lead-in to another marker, looks
+				// like an actual marker, return it
+				return x;
+			}
+			// stuffed zero has x=0 now which ends the loop, meaning we go
+			// back to regular scan loop.
+			// repeated 0xff keeps trying to read the next byte of the marker.
+		}
+	}
+	return STBI__MARKER_none;
+}
+
+// decode image to YCbCr format
+static int stbi__decode_jpeg_image(stbi__jpeg *j) {
+	int m;
+	for (m = 0; m < 4; m++) {
+		j->img_comp[m].raw_data = NULL;
+		j->img_comp[m].raw_coeff = NULL;
+	}
+	j->restart_interval = 0;
+	if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
+	m = stbi__get_marker(j);
+	while (!stbi__EOI(m)) {
+		if (stbi__SOS(m)) {
+			if (!stbi__process_scan_header(j)) return 0;
+			if (!stbi__parse_entropy_coded_data(j)) return 0;
+			if (j->marker == STBI__MARKER_none) {
+				j->marker = stbi__skip_jpeg_junk_at_end(j);
+				// if we reach eof without hitting a marker, stbi__get_marker()
+				// below will fail and we'll eventually return 0
+			}
+			m = stbi__get_marker(j);
+			if (STBI__RESTART(m)) m = stbi__get_marker(j);
+		} else if (stbi__DNL(m)) {
+			int Ld = stbi__get16be(j->s);
+			stbi__uint32 NL = stbi__get16be(j->s);
+			if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG");
+			if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG");
+			m = stbi__get_marker(j);
+		} else {
+			if (!stbi__process_marker(j, m)) return 1;
+			m = stbi__get_marker(j);
+		}
+	}
+	if (j->progressive) stbi__jpeg_finish(j);
+	return 1;
+}
+
+// static jfif-centered resampling (across block boundaries)
+
+typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1, int w, int hs);
+
+#define stbi__div4(x) ((stbi_uc)((x) >> 2))
+
+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) {
+	STBI_NOTUSED(out);
+	STBI_NOTUSED(in_far);
+	STBI_NOTUSED(w);
+	STBI_NOTUSED(hs);
+	return in_near;
+}
+
+static stbi_uc *stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w,
+									   int hs) {
+	// need to generate two samples vertically for every one in input
+	int i;
+	STBI_NOTUSED(hs);
+	for (i = 0; i < w; ++i) out[i] = stbi__div4(3 * in_near[i] + in_far[i] + 2);
+	return out;
+}
+
+static stbi_uc *stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w,
+									   int hs) {
+	// need to generate two samples horizontally for every one in input
+	int i;
+	stbi_uc *input = in_near;
+
+	if (w == 1) {
+		// if only one sample, can't do any interpolation
+		out[0] = out[1] = input[0];
+		return out;
+	}
+
+	out[0] = input[0];
+	out[1] = stbi__div4(input[0] * 3 + input[1] + 2);
+	for (i = 1; i < w - 1; ++i) {
+		int n = 3 * input[i] + 2;
+		out[i * 2 + 0] = stbi__div4(n + input[i - 1]);
+		out[i * 2 + 1] = stbi__div4(n + input[i + 1]);
+	}
+	out[i * 2 + 0] = stbi__div4(input[w - 2] * 3 + input[w - 1] + 2);
+	out[i * 2 + 1] = input[w - 1];
+
+	STBI_NOTUSED(in_far);
+	STBI_NOTUSED(hs);
+
+	return out;
+}
+
+#define stbi__div16(x) ((stbi_uc)((x) >> 4))
+
+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w,
+										int hs) {
+	// need to generate 2x2 samples for every one in input
+	int i, t0, t1;
+	if (w == 1) {
+		out[0] = out[1] = stbi__div4(3 * in_near[0] + in_far[0] + 2);
+		return out;
+	}
+
+	t1 = 3 * in_near[0] + in_far[0];
+	out[0] = stbi__div4(t1 + 2);
+	for (i = 1; i < w; ++i) {
+		t0 = t1;
+		t1 = 3 * in_near[i] + in_far[i];
+		out[i * 2 - 1] = stbi__div16(3 * t0 + t1 + 8);
+		out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+	}
+	out[w * 2 - 1] = stbi__div4(t1 + 2);
+
+	STBI_NOTUSED(hs);
+
+	return out;
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w,
+											 int hs) {
+	// need to generate 2x2 samples for every one in input
+	int i = 0, t0, t1;
+
+	if (w == 1) {
+		out[0] = out[1] = stbi__div4(3 * in_near[0] + in_far[0] + 2);
+		return out;
+	}
+
+	t1 = 3 * in_near[0] + in_far[0];
+	// process groups of 8 pixels for as long as we can.
+	// note we can't handle the last pixel in a row in this loop
+	// because we need to handle the filter boundary conditions.
+	for (; i < ((w - 1) & ~7); i += 8) {
+#if defined(STBI_SSE2)
+		// load and perform the vertical filtering pass
+		// this uses 3*x + y = 4*x + (y - x)
+		__m128i zero = _mm_setzero_si128();
+		__m128i farb = _mm_loadl_epi64((__m128i *)(in_far + i));
+		__m128i nearb = _mm_loadl_epi64((__m128i *)(in_near + i));
+		__m128i farw = _mm_unpacklo_epi8(farb, zero);
+		__m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+		__m128i diff = _mm_sub_epi16(farw, nearw);
+		__m128i nears = _mm_slli_epi16(nearw, 2);
+		__m128i curr = _mm_add_epi16(nears, diff); // current row
+
+		// horizontal filter works the same based on shifted vers of current
+		// row. "prev" is current row shifted right by 1 pixel; we need to
+		// insert the previous pixel value (from t1).
+		// "next" is current row shifted left by 1 pixel, with first pixel
+		// of next block of 8 pixels added in.
+		__m128i prv0 = _mm_slli_si128(curr, 2);
+		__m128i nxt0 = _mm_srli_si128(curr, 2);
+		__m128i prev = _mm_insert_epi16(prv0, t1, 0);
+		__m128i next = _mm_insert_epi16(nxt0, 3 * in_near[i + 8] + in_far[i + 8], 7);
+
+		// horizontal filter, polyphase implementation since it's convenient:
+		// even pixels = 3*cur + prev = cur*4 + (prev - cur)
+		// odd  pixels = 3*cur + next = cur*4 + (next - cur)
+		// note the shared term.
+		__m128i bias = _mm_set1_epi16(8);
+		__m128i curs = _mm_slli_epi16(curr, 2);
+		__m128i prvd = _mm_sub_epi16(prev, curr);
+		__m128i nxtd = _mm_sub_epi16(next, curr);
+		__m128i curb = _mm_add_epi16(curs, bias);
+		__m128i even = _mm_add_epi16(prvd, curb);
+		__m128i odd = _mm_add_epi16(nxtd, curb);
+
+		// interleave even and odd pixels, then undo scaling.
+		__m128i int0 = _mm_unpacklo_epi16(even, odd);
+		__m128i int1 = _mm_unpackhi_epi16(even, odd);
+		__m128i de0 = _mm_srli_epi16(int0, 4);
+		__m128i de1 = _mm_srli_epi16(int1, 4);
+
+		// pack and write output
+		__m128i outv = _mm_packus_epi16(de0, de1);
+		_mm_storeu_si128((__m128i *)(out + i * 2), outv);
+#elif defined(STBI_NEON)
+		// load and perform the vertical filtering pass
+		// this uses 3*x + y = 4*x + (y - x)
+		uint8x8_t farb = vld1_u8(in_far + i);
+		uint8x8_t nearb = vld1_u8(in_near + i);
+		int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+		int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+		int16x8_t curr = vaddq_s16(nears, diff); // current row
+
+		// horizontal filter works the same based on shifted vers of current
+		// row. "prev" is current row shifted right by 1 pixel; we need to
+		// insert the previous pixel value (from t1).
+		// "next" is current row shifted left by 1 pixel, with first pixel
+		// of next block of 8 pixels added in.
+		int16x8_t prv0 = vextq_s16(curr, curr, 7);
+		int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+		int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+		int16x8_t next = vsetq_lane_s16(3 * in_near[i + 8] + in_far[i + 8], nxt0, 7);
+
+		// horizontal filter, polyphase implementation since it's convenient:
+		// even pixels = 3*cur + prev = cur*4 + (prev - cur)
+		// odd  pixels = 3*cur + next = cur*4 + (next - cur)
+		// note the shared term.
+		int16x8_t curs = vshlq_n_s16(curr, 2);
+		int16x8_t prvd = vsubq_s16(prev, curr);
+		int16x8_t nxtd = vsubq_s16(next, curr);
+		int16x8_t even = vaddq_s16(curs, prvd);
+		int16x8_t odd = vaddq_s16(curs, nxtd);
+
+		// undo scaling and round, then store with even/odd phases interleaved
+		uint8x8x2_t o;
+		o.val[0] = vqrshrun_n_s16(even, 4);
+		o.val[1] = vqrshrun_n_s16(odd, 4);
+		vst2_u8(out + i * 2, o);
+#endif
+
+		// "previous" value for next iter
+		t1 = 3 * in_near[i + 7] + in_far[i + 7];
+	}
+
+	t0 = t1;
+	t1 = 3 * in_near[i] + in_far[i];
+	out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+
+	for (++i; i < w; ++i) {
+		t0 = t1;
+		t1 = 3 * in_near[i] + in_far[i];
+		out[i * 2 - 1] = stbi__div16(3 * t0 + t1 + 8);
+		out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+	}
+	out[w * 2 - 1] = stbi__div4(t1 + 2);
+
+	STBI_NOTUSED(hs);
+
+	return out;
+}
+#endif
+
+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w,
+										   int hs) {
+	// resample with nearest-neighbor
+	int i, j;
+	STBI_NOTUSED(in_far);
+	for (i = 0; i < w; ++i)
+		for (j = 0; j < hs; ++j) out[i * hs + j] = in_near[i];
+	return out;
+}
+
+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
+// to make sure the code produces the same results in both SIMD and scalar
+#define stbi__float2fixed(x) (((int)((x) * 4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb,
+								   const stbi_uc *pcr, int count, int step) {
+	int i;
+	for (i = 0; i < count; ++i) {
+		int y_fixed = (y[i] << 20) + (1 << 19); // rounding
+		int r, g, b;
+		int cr = pcr[i] - 128;
+		int cb = pcb[i] - 128;
+		r = y_fixed + cr * stbi__float2fixed(1.40200f);
+		g = y_fixed + (cr * -stbi__float2fixed(0.71414f)) +
+			((cb * -stbi__float2fixed(0.34414f)) & 0xffff0000);
+		b = y_fixed + cb * stbi__float2fixed(1.77200f);
+		r >>= 20;
+		g >>= 20;
+		b >>= 20;
+		if ((unsigned)r > 255) {
+			if (r < 0)
+				r = 0;
+			else
+				r = 255;
+		}
+		if ((unsigned)g > 255) {
+			if (g < 0)
+				g = 0;
+			else
+				g = 255;
+		}
+		if ((unsigned)b > 255) {
+			if (b < 0)
+				b = 0;
+			else
+				b = 255;
+		}
+		out[0] = (stbi_uc)r;
+		out[1] = (stbi_uc)g;
+		out[2] = (stbi_uc)b;
+		out[3] = 255;
+		out += step;
+	}
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb,
+									stbi_uc const *pcr, int count, int step) {
+	int i = 0;
+
+#ifdef STBI_SSE2
+	// step == 3 is pretty ugly on the final interleave, and i'm not convinced
+	// it's useful in practice (you wouldn't use it for textures, for example).
+	// so just accelerate step == 4 case.
+	if (step == 4) {
+		// this is a fairly straightforward implementation and not
+		// super-optimized.
+		__m128i signflip = _mm_set1_epi8(-0x80);
+		__m128i cr_const0 = _mm_set1_epi16((short)(1.40200f * 4096.0f + 0.5f));
+		__m128i cr_const1 = _mm_set1_epi16(-(short)(0.71414f * 4096.0f + 0.5f));
+		__m128i cb_const0 = _mm_set1_epi16(-(short)(0.34414f * 4096.0f + 0.5f));
+		__m128i cb_const1 = _mm_set1_epi16((short)(1.77200f * 4096.0f + 0.5f));
+		__m128i y_bias = _mm_set1_epi8((char)(unsigned char)128);
+		__m128i xw = _mm_set1_epi16(255); // alpha channel
+
+		for (; i + 7 < count; i += 8) {
+			// load
+			__m128i y_bytes = _mm_loadl_epi64((__m128i *)(y + i));
+			__m128i cr_bytes = _mm_loadl_epi64((__m128i *)(pcr + i));
+			__m128i cb_bytes = _mm_loadl_epi64((__m128i *)(pcb + i));
+			__m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+			__m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+
+			// unpack to short (and left-shift cr, cb by 8)
+			__m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes);
+			__m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+			__m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+
+			// color transform
+			__m128i yws = _mm_srli_epi16(yw, 4);
+			__m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+			__m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+			__m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+			__m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+			__m128i rws = _mm_add_epi16(cr0, yws);
+			__m128i gwt = _mm_add_epi16(cb0, yws);
+			__m128i bws = _mm_add_epi16(yws, cb1);
+			__m128i gws = _mm_add_epi16(gwt, cr1);
+
+			// descale
+			__m128i rw = _mm_srai_epi16(rws, 4);
+			__m128i bw = _mm_srai_epi16(bws, 4);
+			__m128i gw = _mm_srai_epi16(gws, 4);
+
+			// back to byte, set up for transpose
+			__m128i brb = _mm_packus_epi16(rw, bw);
+			__m128i gxb = _mm_packus_epi16(gw, xw);
+
+			// transpose to interleave channels
+			__m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+			__m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+			__m128i o0 = _mm_unpacklo_epi16(t0, t1);
+			__m128i o1 = _mm_unpackhi_epi16(t0, t1);
+
+			// store
+			_mm_storeu_si128((__m128i *)(out + 0), o0);
+			_mm_storeu_si128((__m128i *)(out + 16), o1);
+			out += 32;
+		}
+	}
+#endif
+
+#ifdef STBI_NEON
+	// in this version, step=3 support would be easy to add. but is there
+	// demand?
+	if (step == 4) {
+		// this is a fairly straightforward implementation and not
+		// super-optimized.
+		uint8x8_t signflip = vdup_n_u8(0x80);
+		int16x8_t cr_const0 = vdupq_n_s16((short)(1.40200f * 4096.0f + 0.5f));
+		int16x8_t cr_const1 = vdupq_n_s16(-(short)(0.71414f * 4096.0f + 0.5f));
+		int16x8_t cb_const0 = vdupq_n_s16(-(short)(0.34414f * 4096.0f + 0.5f));
+		int16x8_t cb_const1 = vdupq_n_s16((short)(1.77200f * 4096.0f + 0.5f));
+
+		for (; i + 7 < count; i += 8) {
+			// load
+			uint8x8_t y_bytes = vld1_u8(y + i);
+			uint8x8_t cr_bytes = vld1_u8(pcr + i);
+			uint8x8_t cb_bytes = vld1_u8(pcb + i);
+			int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+			int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+
+			// expand to s16
+			int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+			int16x8_t crw = vshll_n_s8(cr_biased, 7);
+			int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+
+			// color transform
+			int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+			int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+			int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+			int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+			int16x8_t rws = vaddq_s16(yws, cr0);
+			int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+			int16x8_t bws = vaddq_s16(yws, cb1);
+
+			// undo scaling, round, convert to byte
+			uint8x8x4_t o;
+			o.val[0] = vqrshrun_n_s16(rws, 4);
+			o.val[1] = vqrshrun_n_s16(gws, 4);
+			o.val[2] = vqrshrun_n_s16(bws, 4);
+			o.val[3] = vdup_n_u8(255);
+
+			// store, interleaving r/g/b/a
+			vst4_u8(out, o);
+			out += 8 * 4;
+		}
+	}
+#endif
+
+	for (; i < count; ++i) {
+		int y_fixed = (y[i] << 20) + (1 << 19); // rounding
+		int r, g, b;
+		int cr = pcr[i] - 128;
+		int cb = pcb[i] - 128;
+		r = y_fixed + cr * stbi__float2fixed(1.40200f);
+		g = y_fixed + cr * -stbi__float2fixed(0.71414f) +
+			((cb * -stbi__float2fixed(0.34414f)) & 0xffff0000);
+		b = y_fixed + cb * stbi__float2fixed(1.77200f);
+		r >>= 20;
+		g >>= 20;
+		b >>= 20;
+		if ((unsigned)r > 255) {
+			if (r < 0)
+				r = 0;
+			else
+				r = 255;
+		}
+		if ((unsigned)g > 255) {
+			if (g < 0)
+				g = 0;
+			else
+				g = 255;
+		}
+		if ((unsigned)b > 255) {
+			if (b < 0)
+				b = 0;
+			else
+				b = 255;
+		}
+		out[0] = (stbi_uc)r;
+		out[1] = (stbi_uc)g;
+		out[2] = (stbi_uc)b;
+		out[3] = 255;
+		out += step;
+	}
+}
+#endif
+
+// set up the kernels
+static void stbi__setup_jpeg(stbi__jpeg *j) {
+	j->idct_block_kernel = stbi__idct_block;
+	j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+	j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+
+#ifdef STBI_SSE2
+	if (stbi__sse2_available()) {
+		j->idct_block_kernel = stbi__idct_simd;
+		j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+		j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+	}
+#endif
+
+#ifdef STBI_NEON
+	j->idct_block_kernel = stbi__idct_simd;
+	j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+	j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+#endif
+}
+
+// clean up the temporary component buffers
+static void stbi__cleanup_jpeg(stbi__jpeg *j) { stbi__free_jpeg_components(j, j->s->img_n, 0); }
+
+typedef struct {
+	resample_row_func resample;
+	stbi_uc *line0, *line1;
+	int hs, vs;	 // expansion factor in each axis
+	int w_lores; // horizontal pixels pre-expansion
+	int ystep;	 // how far through vertical expansion we are
+	int ypos;	 // which pre-expansion row we're on
+} stbi__resample;
+
+// fast 0..255 * 0..255 => 0..255 rounded multiplication
+static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y) {
+	unsigned int t = x * y + 128;
+	return (stbi_uc)((t + (t >> 8)) >> 8);
+}
+
+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) {
+	int n, decode_n, is_rgb;
+	z->s->img_n = 0; // make stbi__cleanup_jpeg safe
+
+	// validate req_comp
+	if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+
+	// load a jpeg image from whichever source, but leave in YCbCr format
+	if (!stbi__decode_jpeg_image(z)) {
+		stbi__cleanup_jpeg(z);
+		return NULL;
+	}
+
+	// determine actual number of components to generate
+	n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
+
+	is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
+
+	if (z->s->img_n == 3 && n < 3 && !is_rgb)
+		decode_n = 1;
+	else
+		decode_n = z->s->img_n;
+
+	// nothing to do if no components requested; check this now to avoid
+	// accessing uninitialized coutput[0] later
+	if (decode_n <= 0) {
+		stbi__cleanup_jpeg(z);
+		return NULL;
+	}
+
+	// resample and color-convert
+	{
+		int k;
+		unsigned int i, j;
+		stbi_uc *output;
+		stbi_uc *coutput[4] = {NULL, NULL, NULL, NULL};
+
+		stbi__resample res_comp[4];
+
+		for (k = 0; k < decode_n; ++k) {
+			stbi__resample *r = &res_comp[k];
+
+			// allocate line buffer big enough for upsampling off the edges
+			// with upsample factor of 4
+			z->img_comp[k].linebuf = (stbi_uc *)stbi__malloc(z->s->img_x + 3);
+			if (!z->img_comp[k].linebuf) {
+				stbi__cleanup_jpeg(z);
+				return stbi__errpuc("outofmem", "Out of memory");
+			}
+
+			r->hs = z->img_h_max / z->img_comp[k].h;
+			r->vs = z->img_v_max / z->img_comp[k].v;
+			r->ystep = r->vs >> 1;
+			r->w_lores = (z->s->img_x + r->hs - 1) / r->hs;
+			r->ypos = 0;
+			r->line0 = r->line1 = z->img_comp[k].data;
+
+			if (r->hs == 1 && r->vs == 1)
+				r->resample = resample_row_1;
+			else if (r->hs == 1 && r->vs == 2)
+				r->resample = stbi__resample_row_v_2;
+			else if (r->hs == 2 && r->vs == 1)
+				r->resample = stbi__resample_row_h_2;
+			else if (r->hs == 2 && r->vs == 2)
+				r->resample = z->resample_row_hv_2_kernel;
+			else
+				r->resample = stbi__resample_row_generic;
+		}
+
+		// can't error after this so, this is safe
+		output = (stbi_uc *)stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
+		if (!output) {
+			stbi__cleanup_jpeg(z);
+			return stbi__errpuc("outofmem", "Out of memory");
+		}
+
+		// now go ahead and resample
+		for (j = 0; j < z->s->img_y; ++j) {
+			stbi_uc *out = output + n * z->s->img_x * j;
+			for (k = 0; k < decode_n; ++k) {
+				stbi__resample *r = &res_comp[k];
+				int y_bot = r->ystep >= (r->vs >> 1);
+				coutput[k] = r->resample(z->img_comp[k].linebuf, y_bot ? r->line1 : r->line0,
+										 y_bot ? r->line0 : r->line1, r->w_lores, r->hs);
+				if (++r->ystep >= r->vs) {
+					r->ystep = 0;
+					r->line0 = r->line1;
+					if (++r->ypos < z->img_comp[k].y) r->line1 += z->img_comp[k].w2;
+				}
+			}
+			if (n >= 3) {
+				stbi_uc *y = coutput[0];
+				if (z->s->img_n == 3) {
+					if (is_rgb) {
+						for (i = 0; i < z->s->img_x; ++i) {
+							out[0] = y[i];
+							out[1] = coutput[1][i];
+							out[2] = coutput[2][i];
+							out[3] = 255;
+							out += n;
+						}
+					} else {
+						z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+					}
+				} else if (z->s->img_n == 4) {
+					if (z->app14_color_transform == 0) { // CMYK
+						for (i = 0; i < z->s->img_x; ++i) {
+							stbi_uc m = coutput[3][i];
+							out[0] = stbi__blinn_8x8(coutput[0][i], m);
+							out[1] = stbi__blinn_8x8(coutput[1][i], m);
+							out[2] = stbi__blinn_8x8(coutput[2][i], m);
+							out[3] = 255;
+							out += n;
+						}
+					} else if (z->app14_color_transform == 2) { // YCCK
+						z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+						for (i = 0; i < z->s->img_x; ++i) {
+							stbi_uc m = coutput[3][i];
+							out[0] = stbi__blinn_8x8(255 - out[0], m);
+							out[1] = stbi__blinn_8x8(255 - out[1], m);
+							out[2] = stbi__blinn_8x8(255 - out[2], m);
+							out += n;
+						}
+					} else { // YCbCr + alpha?  Ignore the fourth channel for
+							 // now
+						z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+					}
+				} else
+					for (i = 0; i < z->s->img_x; ++i) {
+						out[0] = out[1] = out[2] = y[i];
+						out[3] = 255; // not used if n==3
+						out += n;
+					}
+			} else {
+				if (is_rgb) {
+					if (n == 1)
+						for (i = 0; i < z->s->img_x; ++i)
+							*out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+					else {
+						for (i = 0; i < z->s->img_x; ++i, out += 2) {
+							out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+							out[1] = 255;
+						}
+					}
+				} else if (z->s->img_n == 4 && z->app14_color_transform == 0) {
+					for (i = 0; i < z->s->img_x; ++i) {
+						stbi_uc m = coutput[3][i];
+						stbi_uc r = stbi__blinn_8x8(coutput[0][i], m);
+						stbi_uc g = stbi__blinn_8x8(coutput[1][i], m);
+						stbi_uc b = stbi__blinn_8x8(coutput[2][i], m);
+						out[0] = stbi__compute_y(r, g, b);
+						out[1] = 255;
+						out += n;
+					}
+				} else if (z->s->img_n == 4 && z->app14_color_transform == 2) {
+					for (i = 0; i < z->s->img_x; ++i) {
+						out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
+						out[1] = 255;
+						out += n;
+					}
+				} else {
+					stbi_uc *y = coutput[0];
+					if (n == 1)
+						for (i = 0; i < z->s->img_x; ++i) out[i] = y[i];
+					else
+						for (i = 0; i < z->s->img_x; ++i) {
+							*out++ = y[i];
+							*out++ = 255;
+						}
+				}
+			}
+		}
+		stbi__cleanup_jpeg(z);
+		*out_x = z->s->img_x;
+		*out_y = z->s->img_y;
+		if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output
+		return output;
+	}
+}
+
+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							 stbi__result_info *ri) {
+	unsigned char *result;
+	stbi__jpeg *j = (stbi__jpeg *)stbi__malloc(sizeof(stbi__jpeg));
+	if (!j) return stbi__errpuc("outofmem", "Out of memory");
+	memset(j, 0, sizeof(stbi__jpeg));
+	STBI_NOTUSED(ri);
+	j->s = s;
+	stbi__setup_jpeg(j);
+	result = load_jpeg_image(j, x, y, comp, req_comp);
+	STBI_FREE(j);
+	return result;
+}
+
+static int stbi__jpeg_test(stbi__context *s) {
+	int r;
+	stbi__jpeg *j = (stbi__jpeg *)stbi__malloc(sizeof(stbi__jpeg));
+	if (!j) return stbi__err("outofmem", "Out of memory");
+	memset(j, 0, sizeof(stbi__jpeg));
+	j->s = s;
+	stbi__setup_jpeg(j);
+	r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
+	stbi__rewind(s);
+	STBI_FREE(j);
+	return r;
+}
+
+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) {
+	if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
+		stbi__rewind(j->s);
+		return 0;
+	}
+	if (x) *x = j->s->img_x;
+	if (y) *y = j->s->img_y;
+	if (comp) *comp = j->s->img_n >= 3 ? 3 : 1;
+	return 1;
+}
+
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) {
+	int result;
+	stbi__jpeg *j = (stbi__jpeg *)(stbi__malloc(sizeof(stbi__jpeg)));
+	if (!j) return stbi__err("outofmem", "Out of memory");
+	memset(j, 0, sizeof(stbi__jpeg));
+	j->s = s;
+	result = stbi__jpeg_info_raw(j, x, y, comp);
+	STBI_FREE(j);
+	return result;
+}
+#endif
+
+// public domain zlib decode    v0.2  Sean Barrett 2006-11-18
+//    simple implementation
+//      - all input must be provided in an upfront buffer
+//      - all output is written to a single output buffer (can malloc/realloc)
+//    performance
+//      - fast huffman
+
+#ifndef STBI_NO_ZLIB
+
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1)
+#define STBI__ZNSYMS 288 // number of symbols in literal/length alphabet
+
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct {
+	stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+	stbi__uint16 firstcode[16];
+	int maxcode[17];
+	stbi__uint16 firstsymbol[16];
+	stbi_uc size[STBI__ZNSYMS];
+	stbi__uint16 value[STBI__ZNSYMS];
+} stbi__zhuffman;
+
+stbi_inline static int stbi__bitreverse16(int n) {
+	n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
+	n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
+	n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
+	n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
+	return n;
+}
+
+stbi_inline static int stbi__bit_reverse(int v, int bits) {
+	STBI_ASSERT(bits <= 16);
+	// to bit reverse n bits, reverse 16 and shift
+	// e.g. 11 bits, bit reverse and shift away 5
+	return stbi__bitreverse16(v) >> (16 - bits);
+}
+
+static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num) {
+	int i, k = 0;
+	int code, next_code[16], sizes[17];
+
+	// DEFLATE spec for generating codes
+	memset(sizes, 0, sizeof(sizes));
+	memset(z->fast, 0, sizeof(z->fast));
+	for (i = 0; i < num; ++i) ++sizes[sizelist[i]];
+	sizes[0] = 0;
+	for (i = 1; i < 16; ++i)
+		if (sizes[i] > (1 << i)) return stbi__err("bad sizes", "Corrupt PNG");
+	code = 0;
+	for (i = 1; i < 16; ++i) {
+		next_code[i] = code;
+		z->firstcode[i] = (stbi__uint16)code;
+		z->firstsymbol[i] = (stbi__uint16)k;
+		code = (code + sizes[i]);
+		if (sizes[i])
+			if (code - 1 >= (1 << i)) return stbi__err("bad codelengths", "Corrupt PNG");
+		z->maxcode[i] = code << (16 - i); // preshift for inner loop
+		code <<= 1;
+		k += sizes[i];
+	}
+	z->maxcode[16] = 0x10000; // sentinel
+	for (i = 0; i < num; ++i) {
+		int s = sizelist[i];
+		if (s) {
+			int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+			stbi__uint16 fastv = (stbi__uint16)((s << 9) | i);
+			z->size[c] = (stbi_uc)s;
+			z->value[c] = (stbi__uint16)i;
+			if (s <= STBI__ZFAST_BITS) {
+				int j = stbi__bit_reverse(next_code[s], s);
+				while (j < (1 << STBI__ZFAST_BITS)) {
+					z->fast[j] = fastv;
+					j += (1 << s);
+				}
+			}
+			++next_code[s];
+		}
+	}
+	return 1;
+}
+
+// zlib-from-memory implementation for PNG reading
+//    because PNG allows splitting the zlib stream arbitrarily,
+//    and it's annoying structurally to have PNG call ZLIB call PNG,
+//    we require PNG read all the IDATs and combine them into a single
+//    memory buffer
+
+typedef struct {
+	stbi_uc *zbuffer, *zbuffer_end;
+	int num_bits;
+	int hit_zeof_once;
+	stbi__uint32 code_buffer;
+
+	char *zout;
+	char *zout_start;
+	char *zout_end;
+	int z_expandable;
+
+	stbi__zhuffman z_length, z_distance;
+} stbi__zbuf;
+
+stbi_inline static int stbi__zeof(stbi__zbuf *z) { return (z->zbuffer >= z->zbuffer_end); }
+
+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z) { return stbi__zeof(z) ? 0 : *z->zbuffer++; }
+
+static void stbi__fill_bits(stbi__zbuf *z) {
+	do {
+		if (z->code_buffer >= (1U << z->num_bits)) {
+			z->zbuffer = z->zbuffer_end; /* treat this as EOF so we fail. */
+			return;
+		}
+		z->code_buffer |= (unsigned int)stbi__zget8(z) << z->num_bits;
+		z->num_bits += 8;
+	} while (z->num_bits <= 24);
+}
+
+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n) {
+	unsigned int k;
+	if (z->num_bits < n) stbi__fill_bits(z);
+	k = z->code_buffer & ((1 << n) - 1);
+	z->code_buffer >>= n;
+	z->num_bits -= n;
+	return k;
+}
+
+static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z) {
+	int b, s, k;
+	// not resolved by fast table, so compute it the slow way
+	// use jpeg approach, which requires MSbits at top
+	k = stbi__bit_reverse(a->code_buffer, 16);
+	for (s = STBI__ZFAST_BITS + 1;; ++s)
+		if (k < z->maxcode[s]) break;
+	if (s >= 16) return -1; // invalid code!
+	// code size is s, so:
+	b = (k >> (16 - s)) - z->firstcode[s] + z->firstsymbol[s];
+	if (b >= STBI__ZNSYMS) return -1; // some data was corrupt somewhere!
+	if (z->size[b] != s) return -1;	  // was originally an assert, but report failure instead.
+	a->code_buffer >>= s;
+	a->num_bits -= s;
+	return z->value[b];
+}
+
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z) {
+	int b, s;
+	if (a->num_bits < 16) {
+		if (stbi__zeof(a)) {
+			if (!a->hit_zeof_once) {
+				// This is the first time we hit eof, insert 16 extra padding
+				// btis to allow us to keep going; if we actually consume any of
+				// them though, that is invalid data. This is caught later.
+				a->hit_zeof_once = 1;
+				a->num_bits += 16; // add 16 implicit zero bits
+			} else {
+				// We already inserted our extra 16 padding bits and are again
+				// out, this stream is actually prematurely terminated.
+				return -1;
+			}
+		} else {
+			stbi__fill_bits(a);
+		}
+	}
+	b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+	if (b) {
+		s = b >> 9;
+		a->code_buffer >>= s;
+		a->num_bits -= s;
+		return b & 511;
+	}
+	return stbi__zhuffman_decode_slowpath(a, z);
+}
+
+static int stbi__zexpand(stbi__zbuf *z, char *zout,
+						 int n) // need to make room for n bytes
+{
+	char *q;
+	unsigned int cur, limit, old_limit;
+	z->zout = zout;
+	if (!z->z_expandable) return stbi__err("output buffer limit", "Corrupt PNG");
+	cur = (unsigned int)(z->zout - z->zout_start);
+	limit = old_limit = (unsigned)(z->zout_end - z->zout_start);
+	if (UINT_MAX - cur < (unsigned)n) return stbi__err("outofmem", "Out of memory");
+	while (cur + n > limit) {
+		if (limit > UINT_MAX / 2) return stbi__err("outofmem", "Out of memory");
+		limit *= 2;
+	}
+	q = (char *)STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+	STBI_NOTUSED(old_limit);
+	if (q == NULL) return stbi__err("outofmem", "Out of memory");
+	z->zout_start = q;
+	z->zout = q + cur;
+	z->zout_end = q + limit;
+	return 1;
+}
+
+static const int stbi__zlength_base[31] = {3,  4,	5,	 6,	  7,   8,	9,	 10, 11, 13, 15,
+										   17, 19,	23,	 27,  31,  35,	43,	 51, 59, 67, 83,
+										   99, 115, 131, 163, 195, 227, 258, 0,	 0};
+
+static const int stbi__zlength_extra[31] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
+											3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 0, 0};
+
+static const int stbi__zdist_base[32] = {
+	1,	 2,	  3,   4,	5,	  7,	9,	  13,	17,	  25,	33,	  49,	 65,	97,	   129, 193,
+	257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577, 0,	0};
+
+static const int stbi__zdist_extra[32] = {0, 0, 0, 0, 1, 1, 2, 2,  3,  3,  4,  4,  5,  5,  6,
+										  6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
+
+static int stbi__parse_huffman_block(stbi__zbuf *a) {
+	char *zout = a->zout;
+	for (;;) {
+		int z = stbi__zhuffman_decode(a, &a->z_length);
+		if (z < 256) {
+			if (z < 0)
+				return stbi__err("bad huffman code",
+								 "Corrupt PNG"); // error in huffman codes
+			if (zout >= a->zout_end) {
+				if (!stbi__zexpand(a, zout, 1)) return 0;
+				zout = a->zout;
+			}
+			*zout++ = (char)z;
+		} else {
+			stbi_uc *p;
+			int len, dist;
+			if (z == 256) {
+				a->zout = zout;
+				if (a->hit_zeof_once && a->num_bits < 16) {
+					// The first time we hit zeof, we inserted 16 extra zero
+					// bits into our bit buffer so the decoder can just do its
+					// speculative decoding. But if we actually consumed any of
+					// those bits (which is the case when num_bits < 16), the
+					// stream actually read past the end so it is malformed.
+					return stbi__err("unexpected end", "Corrupt PNG");
+				}
+				return 1;
+			}
+			if (z >= 286)
+				return stbi__err("bad huffman code",
+								 "Corrupt PNG"); // per DEFLATE, length codes 286 and 287
+												 // must not appear in compressed data
+			z -= 257;
+			len = stbi__zlength_base[z];
+			if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
+			z = stbi__zhuffman_decode(a, &a->z_distance);
+			if (z < 0 || z >= 30)
+				return stbi__err("bad huffman code",
+								 "Corrupt PNG"); // per DEFLATE, distance codes 30 and 31
+												 // must not appear in compressed data
+			dist = stbi__zdist_base[z];
+			if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+			if (zout - a->zout_start < dist) return stbi__err("bad dist", "Corrupt PNG");
+			if (len > a->zout_end - zout) {
+				if (!stbi__zexpand(a, zout, len)) return 0;
+				zout = a->zout;
+			}
+			p = (stbi_uc *)(zout - dist);
+			if (dist == 1) { // run of one byte; common in images.
+				stbi_uc v = *p;
+				if (len) {
+					do *zout++ = v;
+					while (--len);
+				}
+			} else {
+				if (len) {
+					do *zout++ = *p++;
+					while (--len);
+				}
+			}
+		}
+	}
+}
+
+static int stbi__compute_huffman_codes(stbi__zbuf *a) {
+	static const stbi_uc length_dezigzag[19] = {16, 17, 18, 0, 8,  7, 9,  6, 10, 5,
+												11, 4,	12, 3, 13, 2, 14, 1, 15};
+	stbi__zhuffman z_codelength;
+	stbi_uc lencodes[286 + 32 + 137]; // padding for maximum single op
+	stbi_uc codelength_sizes[19];
+	int i, n;
+
+	int hlit = stbi__zreceive(a, 5) + 257;
+	int hdist = stbi__zreceive(a, 5) + 1;
+	int hclen = stbi__zreceive(a, 4) + 4;
+	int ntot = hlit + hdist;
+
+	memset(codelength_sizes, 0, sizeof(codelength_sizes));
+	for (i = 0; i < hclen; ++i) {
+		int s = stbi__zreceive(a, 3);
+		codelength_sizes[length_dezigzag[i]] = (stbi_uc)s;
+	}
+	if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
+
+	n = 0;
+	while (n < ntot) {
+		int c = stbi__zhuffman_decode(a, &z_codelength);
+		if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
+		if (c < 16)
+			lencodes[n++] = (stbi_uc)c;
+		else {
+			stbi_uc fill = 0;
+			if (c == 16) {
+				c = stbi__zreceive(a, 2) + 3;
+				if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG");
+				fill = lencodes[n - 1];
+			} else if (c == 17) {
+				c = stbi__zreceive(a, 3) + 3;
+			} else if (c == 18) {
+				c = stbi__zreceive(a, 7) + 11;
+			} else {
+				return stbi__err("bad codelengths", "Corrupt PNG");
+			}
+			if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG");
+			memset(lencodes + n, fill, c);
+			n += c;
+		}
+	}
+	if (n != ntot) return stbi__err("bad codelengths", "Corrupt PNG");
+	if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
+	if (!stbi__zbuild_huffman(&a->z_distance, lencodes + hlit, hdist)) return 0;
+	return 1;
+}
+
+static int stbi__parse_uncompressed_block(stbi__zbuf *a) {
+	stbi_uc header[4];
+	int len, nlen, k;
+	if (a->num_bits & 7) stbi__zreceive(a, a->num_bits & 7); // discard
+	// drain the bit-packed data into header
+	k = 0;
+	while (a->num_bits > 0) {
+		header[k++] = (stbi_uc)(a->code_buffer & 255); // suppress MSVC run-time check
+		a->code_buffer >>= 8;
+		a->num_bits -= 8;
+	}
+	if (a->num_bits < 0) return stbi__err("zlib corrupt", "Corrupt PNG");
+	// now fill header the normal way
+	while (k < 4) header[k++] = stbi__zget8(a);
+	len = header[1] * 256 + header[0];
+	nlen = header[3] * 256 + header[2];
+	if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt", "Corrupt PNG");
+	if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer", "Corrupt PNG");
+	if (a->zout + len > a->zout_end)
+		if (!stbi__zexpand(a, a->zout, len)) return 0;
+	memcpy(a->zout, a->zbuffer, len);
+	a->zbuffer += len;
+	a->zout += len;
+	return 1;
+}
+
+static int stbi__parse_zlib_header(stbi__zbuf *a) {
+	int cmf = stbi__zget8(a);
+	int cm = cmf & 15;
+	/* int cinfo = cmf >> 4; */
+	int flg = stbi__zget8(a);
+	if (stbi__zeof(a)) return stbi__err("bad zlib header", "Corrupt PNG"); // zlib spec
+	if ((cmf * 256 + flg) % 31 != 0)
+		return stbi__err("bad zlib header", "Corrupt PNG"); // zlib spec
+	if (flg & 32)
+		return stbi__err("no preset dict",
+						 "Corrupt PNG"); // preset dictionary not allowed in png
+	if (cm != 8) return stbi__err("bad compression",
+								  "Corrupt PNG"); // DEFLATE required for png
+	// window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+	return 1;
+}
+
+static const stbi_uc stbi__zdefault_length[STBI__ZNSYMS] = {
+	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+	9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+	9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+	9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8};
+static const stbi_uc stbi__zdefault_distance[32] = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+													5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5};
+/*
+Init algorithm:
+{
+   int i;   // use <= to match clearly with spec
+   for (i=0; i <= 143; ++i)     stbi__zdefault_length[i]   = 8;
+   for (   ; i <= 255; ++i)     stbi__zdefault_length[i]   = 9;
+   for (   ; i <= 279; ++i)     stbi__zdefault_length[i]   = 7;
+   for (   ; i <= 287; ++i)     stbi__zdefault_length[i]   = 8;
+
+   for (i=0; i <=  31; ++i)     stbi__zdefault_distance[i] = 5;
+}
+*/
+
+static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) {
+	int final, type;
+	if (parse_header)
+		if (!stbi__parse_zlib_header(a)) return 0;
+	a->num_bits = 0;
+	a->code_buffer = 0;
+	a->hit_zeof_once = 0;
+	do {
+		final = stbi__zreceive(a, 1);
+		type = stbi__zreceive(a, 2);
+		if (type == 0) {
+			if (!stbi__parse_uncompressed_block(a)) return 0;
+		} else if (type == 3) {
+			return 0;
+		} else {
+			if (type == 1) {
+				// use fixed code lengths
+				if (!stbi__zbuild_huffman(&a->z_length, stbi__zdefault_length, STBI__ZNSYMS))
+					return 0;
+				if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0;
+			} else {
+				if (!stbi__compute_huffman_codes(a)) return 0;
+			}
+			if (!stbi__parse_huffman_block(a)) return 0;
+		}
+	} while (!final);
+	return 1;
+}
+
+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) {
+	a->zout_start = obuf;
+	a->zout = obuf;
+	a->zout_end = obuf + olen;
+	a->z_expandable = exp;
+
+	return stbi__parse_zlib(a, parse_header);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size,
+												int *outlen) {
+	stbi__zbuf a;
+	char *p = (char *)stbi__malloc(initial_size);
+	if (p == NULL) return NULL;
+	a.zbuffer = (stbi_uc *)buffer;
+	a.zbuffer_end = (stbi_uc *)buffer + len;
+	if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
+		if (outlen) *outlen = (int)(a.zout - a.zout_start);
+		return a.zout_start;
+	} else {
+		STBI_FREE(a.zout_start);
+		return NULL;
+	}
+}
+
+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) {
+	return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len,
+														   int initial_size, int *outlen,
+														   int parse_header) {
+	stbi__zbuf a;
+	char *p = (char *)stbi__malloc(initial_size);
+	if (p == NULL) return NULL;
+	a.zbuffer = (stbi_uc *)buffer;
+	a.zbuffer_end = (stbi_uc *)buffer + len;
+	if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
+		if (outlen) *outlen = (int)(a.zout - a.zout_start);
+		return a.zout_start;
+	} else {
+		STBI_FREE(a.zout_start);
+		return NULL;
+	}
+}
+
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) {
+	stbi__zbuf a;
+	a.zbuffer = (stbi_uc *)ibuffer;
+	a.zbuffer_end = (stbi_uc *)ibuffer + ilen;
+	if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+		return (int)(a.zout - a.zout_start);
+	else
+		return -1;
+}
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) {
+	stbi__zbuf a;
+	char *p = (char *)stbi__malloc(16384);
+	if (p == NULL) return NULL;
+	a.zbuffer = (stbi_uc *)buffer;
+	a.zbuffer_end = (stbi_uc *)buffer + len;
+	if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
+		if (outlen) *outlen = (int)(a.zout - a.zout_start);
+		return a.zout_start;
+	} else {
+		STBI_FREE(a.zout_start);
+		return NULL;
+	}
+}
+
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer,
+											 int ilen) {
+	stbi__zbuf a;
+	a.zbuffer = (stbi_uc *)ibuffer;
+	a.zbuffer_end = (stbi_uc *)ibuffer + ilen;
+	if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+		return (int)(a.zout - a.zout_start);
+	else
+		return -1;
+}
+#endif
+
+// public domain "baseline" PNG decoder   v0.10  Sean Barrett 2006-11-18
+//    simple implementation
+//      - only 8-bit samples
+//      - no CRC checking
+//      - allocates lots of intermediate memory
+//        - avoids problem of streaming data between subsystems
+//        - avoids explicit window management
+//    performance
+//      - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+
+#ifndef STBI_NO_PNG
+typedef struct {
+	stbi__uint32 length;
+	stbi__uint32 type;
+} stbi__pngchunk;
+
+static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) {
+	stbi__pngchunk c;
+	c.length = stbi__get32be(s);
+	c.type = stbi__get32be(s);
+	return c;
+}
+
+static int stbi__check_png_header(stbi__context *s) {
+	static const stbi_uc png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+	int i;
+	for (i = 0; i < 8; ++i)
+		if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig", "Not a PNG");
+	return 1;
+}
+
+typedef struct {
+	stbi__context *s;
+	stbi_uc *idata, *expanded, *out;
+	int depth;
+} stbi__png;
+
+enum {
+	STBI__F_none = 0,
+	STBI__F_sub = 1,
+	STBI__F_up = 2,
+	STBI__F_avg = 3,
+	STBI__F_paeth = 4,
+	// synthetic filter used for first scanline to avoid needing a dummy row of
+	// 0s
+	STBI__F_avg_first
+};
+
+static stbi_uc first_row_filter[5] = {
+	STBI__F_none, STBI__F_sub, STBI__F_none, STBI__F_avg_first,
+	STBI__F_sub // Paeth with b=c=0 turns out to be equivalent to sub
+};
+
+static int stbi__paeth(int a, int b, int c) {
+	// This formulation looks very different from the reference in the PNG spec,
+	// but is actually equivalent and has favorable data dependencies and admits
+	// straightforward generation of branch-free code, which helps performance
+	// significantly.
+	int thresh = c * 3 - (a + b);
+	int lo = a < b ? a : b;
+	int hi = a < b ? b : a;
+	int t0 = (hi <= thresh) ? lo : c;
+	int t1 = (thresh <= lo) ? hi : t0;
+	return t1;
+}
+
+static const stbi_uc stbi__depth_scale_table[9] = {0, 0xff, 0x55, 0, 0x11, 0, 0, 0, 0x01};
+
+// adds an extra all-255 alpha channel
+// dest == src is legal
+// img_n must be 1 or 3
+static void stbi__create_png_alpha_expand8(stbi_uc *dest, stbi_uc *src, stbi__uint32 x, int img_n) {
+	int i;
+	// must process data backwards since we allow dest==src
+	if (img_n == 1) {
+		for (i = x - 1; i >= 0; --i) {
+			dest[i * 2 + 1] = 255;
+			dest[i * 2 + 0] = src[i];
+		}
+	} else {
+		STBI_ASSERT(img_n == 3);
+		for (i = x - 1; i >= 0; --i) {
+			dest[i * 4 + 3] = 255;
+			dest[i * 4 + 2] = src[i * 3 + 2];
+			dest[i * 4 + 1] = src[i * 3 + 1];
+			dest[i * 4 + 0] = src[i * 3 + 0];
+		}
+	}
+}
+
+// create the png data from post-deflated data
+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n,
+									  stbi__uint32 x, stbi__uint32 y, int depth, int color) {
+	int bytes = (depth == 16 ? 2 : 1);
+	stbi__context *s = a->s;
+	stbi__uint32 i, j, stride = x * out_n * bytes;
+	stbi__uint32 img_len, img_width_bytes;
+	stbi_uc *filter_buf;
+	int all_ok = 1;
+	int k;
+	int img_n = s->img_n; // copy it into a local for later
+
+	int output_bytes = out_n * bytes;
+	int filter_bytes = img_n * bytes;
+	int width = x;
+
+	STBI_ASSERT(out_n == s->img_n || out_n == s->img_n + 1);
+	a->out = (stbi_uc *)stbi__malloc_mad3(x, y, output_bytes,
+										  0); // extra bytes to write off the end into
+	if (!a->out) return stbi__err("outofmem", "Out of memory");
+
+	// note: error exits here don't need to clean up a->out individually,
+	// stbi__do_png always does on error.
+	if (!stbi__mad3sizes_valid(img_n, x, depth, 7)) return stbi__err("too large", "Corrupt PNG");
+	img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+	if (!stbi__mad2sizes_valid(img_width_bytes, y, img_width_bytes))
+		return stbi__err("too large", "Corrupt PNG");
+	img_len = (img_width_bytes + 1) * y;
+
+	// we used to check for exact match between raw_len and img_len on
+	// non-interlaced PNGs, but issue #276 reported a PNG in the wild that had
+	// extra data at the end (all zeros), so just check for raw_len < img_len
+	// always.
+	if (raw_len < img_len) return stbi__err("not enough pixels", "Corrupt PNG");
+
+	// Allocate two scan lines worth of filter workspace buffer.
+	filter_buf = (stbi_uc *)stbi__malloc_mad2(img_width_bytes, 2, 0);
+	if (!filter_buf) return stbi__err("outofmem", "Out of memory");
+
+	// Filtering for low-bit-depth images
+	if (depth < 8) {
+		filter_bytes = 1;
+		width = img_width_bytes;
+	}
+
+	for (j = 0; j < y; ++j) {
+		// cur/prior filter buffers alternate
+		stbi_uc *cur = filter_buf + (j & 1) * img_width_bytes;
+		stbi_uc *prior = filter_buf + (~j & 1) * img_width_bytes;
+		stbi_uc *dest = a->out + stride * j;
+		int nk = width * filter_bytes;
+		int filter = *raw++;
+
+		// check filter type
+		if (filter > 4) {
+			all_ok = stbi__err("invalid filter", "Corrupt PNG");
+			break;
+		}
+
+		// if first row, use special filter that doesn't sample previous row
+		if (j == 0) filter = first_row_filter[filter];
+
+		// perform actual filtering
+		switch (filter) {
+		case STBI__F_none:
+			memcpy(cur, raw, nk);
+			break;
+		case STBI__F_sub:
+			memcpy(cur, raw, filter_bytes);
+			for (k = filter_bytes; k < nk; ++k)
+				cur[k] = STBI__BYTECAST(raw[k] + cur[k - filter_bytes]);
+			break;
+		case STBI__F_up:
+			for (k = 0; k < nk; ++k) cur[k] = STBI__BYTECAST(raw[k] + prior[k]);
+			break;
+		case STBI__F_avg:
+			for (k = 0; k < filter_bytes; ++k) cur[k] = STBI__BYTECAST(raw[k] + (prior[k] >> 1));
+			for (k = filter_bytes; k < nk; ++k)
+				cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k - filter_bytes]) >> 1));
+			break;
+		case STBI__F_paeth:
+			for (k = 0; k < filter_bytes; ++k)
+				cur[k] = STBI__BYTECAST(raw[k] + prior[k]); // prior[k] == stbi__paeth(0,prior[k],0)
+			for (k = filter_bytes; k < nk; ++k)
+				cur[k] = STBI__BYTECAST(
+					raw[k] + stbi__paeth(cur[k - filter_bytes], prior[k], prior[k - filter_bytes]));
+			break;
+		case STBI__F_avg_first:
+			memcpy(cur, raw, filter_bytes);
+			for (k = filter_bytes; k < nk; ++k)
+				cur[k] = STBI__BYTECAST(raw[k] + (cur[k - filter_bytes] >> 1));
+			break;
+		}
+
+		raw += nk;
+
+		// expand decoded bits in cur to dest, also adding an extra alpha
+		// channel if desired
+		if (depth < 8) {
+			stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth]
+										 : 1; // scale grayscale values to 0..255 range
+			stbi_uc *in = cur;
+			stbi_uc *out = dest;
+			stbi_uc inb = 0;
+			stbi__uint32 nsmp = x * img_n;
+
+			// expand bits to bytes first
+			if (depth == 4) {
+				for (i = 0; i < nsmp; ++i) {
+					if ((i & 1) == 0) inb = *in++;
+					*out++ = scale * (inb >> 4);
+					inb <<= 4;
+				}
+			} else if (depth == 2) {
+				for (i = 0; i < nsmp; ++i) {
+					if ((i & 3) == 0) inb = *in++;
+					*out++ = scale * (inb >> 6);
+					inb <<= 2;
+				}
+			} else {
+				STBI_ASSERT(depth == 1);
+				for (i = 0; i < nsmp; ++i) {
+					if ((i & 7) == 0) inb = *in++;
+					*out++ = scale * (inb >> 7);
+					inb <<= 1;
+				}
+			}
+
+			// insert alpha=255 values if desired
+			if (img_n != out_n) stbi__create_png_alpha_expand8(dest, dest, x, img_n);
+		} else if (depth == 8) {
+			if (img_n == out_n)
+				memcpy(dest, cur, x * img_n);
+			else
+				stbi__create_png_alpha_expand8(dest, cur, x, img_n);
+		} else if (depth == 16) {
+			// convert the image data from big-endian to platform-native
+			stbi__uint16 *dest16 = (stbi__uint16 *)dest;
+			stbi__uint32 nsmp = x * img_n;
+
+			if (img_n == out_n) {
+				for (i = 0; i < nsmp; ++i, ++dest16, cur += 2) *dest16 = (cur[0] << 8) | cur[1];
+			} else {
+				STBI_ASSERT(img_n + 1 == out_n);
+				if (img_n == 1) {
+					for (i = 0; i < x; ++i, dest16 += 2, cur += 2) {
+						dest16[0] = (cur[0] << 8) | cur[1];
+						dest16[1] = 0xffff;
+					}
+				} else {
+					STBI_ASSERT(img_n == 3);
+					for (i = 0; i < x; ++i, dest16 += 4, cur += 6) {
+						dest16[0] = (cur[0] << 8) | cur[1];
+						dest16[1] = (cur[2] << 8) | cur[3];
+						dest16[2] = (cur[4] << 8) | cur[5];
+						dest16[3] = 0xffff;
+					}
+				}
+			}
+		}
+	}
+
+	STBI_FREE(filter_buf);
+	if (!all_ok) return 0;
+
+	return 1;
+}
+
+static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len,
+								  int out_n, int depth, int color, int interlaced) {
+	int bytes = (depth == 16 ? 2 : 1);
+	int out_bytes = out_n * bytes;
+	stbi_uc *final;
+	int p;
+	if (!interlaced)
+		return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x,
+										  a->s->img_y, depth, color);
+
+	// de-interlacing
+	final = (stbi_uc *)stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
+	if (!final) return stbi__err("outofmem", "Out of memory");
+	for (p = 0; p < 7; ++p) {
+		int xorig[] = {0, 4, 0, 2, 0, 1, 0};
+		int yorig[] = {0, 0, 4, 0, 2, 0, 1};
+		int xspc[] = {8, 8, 4, 4, 2, 2, 1};
+		int yspc[] = {8, 8, 8, 4, 4, 2, 2};
+		int i, j, x, y;
+		// pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+		x = (a->s->img_x - xorig[p] + xspc[p] - 1) / xspc[p];
+		y = (a->s->img_y - yorig[p] + yspc[p] - 1) / yspc[p];
+		if (x && y) {
+			stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
+			if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth,
+											color)) {
+				STBI_FREE(final);
+				return 0;
+			}
+			for (j = 0; j < y; ++j) {
+				for (i = 0; i < x; ++i) {
+					int out_y = j * yspc[p] + yorig[p];
+					int out_x = i * xspc[p] + xorig[p];
+					memcpy(final + out_y * a->s->img_x * out_bytes + out_x * out_bytes,
+						   a->out + (j * x + i) * out_bytes, out_bytes);
+				}
+			}
+			STBI_FREE(a->out);
+			image_data += img_len;
+			image_data_len -= img_len;
+		}
+	}
+	a->out = final;
+
+	return 1;
+}
+
+static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n) {
+	stbi__context *s = z->s;
+	stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+	stbi_uc *p = z->out;
+
+	// compute color-based transparency, assuming we've
+	// already got 255 as the alpha value in the output
+	STBI_ASSERT(out_n == 2 || out_n == 4);
+
+	if (out_n == 2) {
+		for (i = 0; i < pixel_count; ++i) {
+			p[1] = (p[0] == tc[0] ? 0 : 255);
+			p += 2;
+		}
+	} else {
+		for (i = 0; i < pixel_count; ++i) {
+			if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) p[3] = 0;
+			p += 4;
+		}
+	}
+	return 1;
+}
+
+static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n) {
+	stbi__context *s = z->s;
+	stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+	stbi__uint16 *p = (stbi__uint16 *)z->out;
+
+	// compute color-based transparency, assuming we've
+	// already got 65535 as the alpha value in the output
+	STBI_ASSERT(out_n == 2 || out_n == 4);
+
+	if (out_n == 2) {
+		for (i = 0; i < pixel_count; ++i) {
+			p[1] = (p[0] == tc[0] ? 0 : 65535);
+			p += 2;
+		}
+	} else {
+		for (i = 0; i < pixel_count; ++i) {
+			if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) p[3] = 0;
+			p += 4;
+		}
+	}
+	return 1;
+}
+
+static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n) {
+	stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+	stbi_uc *p, *temp_out, *orig = a->out;
+
+	p = (stbi_uc *)stbi__malloc_mad2(pixel_count, pal_img_n, 0);
+	if (p == NULL) return stbi__err("outofmem", "Out of memory");
+
+	// between here and free(out) below, exitting would leak
+	temp_out = p;
+
+	if (pal_img_n == 3) {
+		for (i = 0; i < pixel_count; ++i) {
+			int n = orig[i] * 4;
+			p[0] = palette[n];
+			p[1] = palette[n + 1];
+			p[2] = palette[n + 2];
+			p += 3;
+		}
+	} else {
+		for (i = 0; i < pixel_count; ++i) {
+			int n = orig[i] * 4;
+			p[0] = palette[n];
+			p[1] = palette[n + 1];
+			p[2] = palette[n + 2];
+			p[3] = palette[n + 3];
+			p += 4;
+		}
+	}
+	STBI_FREE(a->out);
+	a->out = temp_out;
+
+	STBI_NOTUSED(len);
+
+	return 1;
+}
+
+static int stbi__unpremultiply_on_load_global = 0;
+static int stbi__de_iphone_flag_global = 0;
+
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) {
+	stbi__unpremultiply_on_load_global = flag_true_if_should_unpremultiply;
+}
+
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) {
+	stbi__de_iphone_flag_global = flag_true_if_should_convert;
+}
+
+#ifndef STBI_THREAD_LOCAL
+#define stbi__unpremultiply_on_load stbi__unpremultiply_on_load_global
+#define stbi__de_iphone_flag stbi__de_iphone_flag_global
+#else
+static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set;
+static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set;
+
+STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply) {
+	stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply;
+	stbi__unpremultiply_on_load_set = 1;
+}
+
+STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert) {
+	stbi__de_iphone_flag_local = flag_true_if_should_convert;
+	stbi__de_iphone_flag_set = 1;
+}
+
+#define stbi__unpremultiply_on_load                                                                \
+	(stbi__unpremultiply_on_load_set ? stbi__unpremultiply_on_load_local                           \
+									 : stbi__unpremultiply_on_load_global)
+#define stbi__de_iphone_flag                                                                       \
+	(stbi__de_iphone_flag_set ? stbi__de_iphone_flag_local : stbi__de_iphone_flag_global)
+#endif // STBI_THREAD_LOCAL
+
+static void stbi__de_iphone(stbi__png *z) {
+	stbi__context *s = z->s;
+	stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+	stbi_uc *p = z->out;
+
+	if (s->img_out_n == 3) { // convert bgr to rgb
+		for (i = 0; i < pixel_count; ++i) {
+			stbi_uc t = p[0];
+			p[0] = p[2];
+			p[2] = t;
+			p += 3;
+		}
+	} else {
+		STBI_ASSERT(s->img_out_n == 4);
+		if (stbi__unpremultiply_on_load) {
+			// convert bgr to rgb and unpremultiply
+			for (i = 0; i < pixel_count; ++i) {
+				stbi_uc a = p[3];
+				stbi_uc t = p[0];
+				if (a) {
+					stbi_uc half = a / 2;
+					p[0] = (p[2] * 255 + half) / a;
+					p[1] = (p[1] * 255 + half) / a;
+					p[2] = (t * 255 + half) / a;
+				} else {
+					p[0] = p[2];
+					p[2] = t;
+				}
+				p += 4;
+			}
+		} else {
+			// convert bgr to rgb
+			for (i = 0; i < pixel_count; ++i) {
+				stbi_uc t = p[0];
+				p[0] = p[2];
+				p[2] = t;
+				p += 4;
+			}
+		}
+	}
+}
+
+#define STBI__PNG_TYPE(a, b, c, d)                                                                 \
+	(((unsigned)(a) << 24) + ((unsigned)(b) << 16) + ((unsigned)(c) << 8) + (unsigned)(d))
+
+static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) {
+	stbi_uc palette[1024], pal_img_n = 0;
+	stbi_uc has_trans = 0, tc[3] = {0};
+	stbi__uint16 tc16[3];
+	stbi__uint32 ioff = 0, idata_limit = 0, i, pal_len = 0;
+	int first = 1, k, interlace = 0, color = 0, is_iphone = 0;
+	stbi__context *s = z->s;
+
+	z->expanded = NULL;
+	z->idata = NULL;
+	z->out = NULL;
+
+	if (!stbi__check_png_header(s)) return 0;
+
+	if (scan == STBI__SCAN_type) return 1;
+
+	for (;;) {
+		stbi__pngchunk c = stbi__get_chunk_header(s);
+		switch (c.type) {
+		case STBI__PNG_TYPE('C', 'g', 'B', 'I'):
+			is_iphone = 1;
+			stbi__skip(s, c.length);
+			break;
+		case STBI__PNG_TYPE('I', 'H', 'D', 'R'): {
+			int comp, filter;
+			if (!first) return stbi__err("multiple IHDR", "Corrupt PNG");
+			first = 0;
+			if (c.length != 13) return stbi__err("bad IHDR len", "Corrupt PNG");
+			s->img_x = stbi__get32be(s);
+			s->img_y = stbi__get32be(s);
+			if (s->img_y > STBI_MAX_DIMENSIONS)
+				return stbi__err("too large", "Very large image (corrupt?)");
+			if (s->img_x > STBI_MAX_DIMENSIONS)
+				return stbi__err("too large", "Very large image (corrupt?)");
+			z->depth = stbi__get8(s);
+			if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16)
+				return stbi__err("1/2/4/8/16-bit only", "PNG not supported: 1/2/4/8/16-bit only");
+			color = stbi__get8(s);
+			if (color > 6) return stbi__err("bad ctype", "Corrupt PNG");
+			if (color == 3 && z->depth == 16) return stbi__err("bad ctype", "Corrupt PNG");
+			if (color == 3)
+				pal_img_n = 3;
+			else if (color & 1)
+				return stbi__err("bad ctype", "Corrupt PNG");
+			comp = stbi__get8(s);
+			if (comp) return stbi__err("bad comp method", "Corrupt PNG");
+			filter = stbi__get8(s);
+			if (filter) return stbi__err("bad filter method", "Corrupt PNG");
+			interlace = stbi__get8(s);
+			if (interlace > 1) return stbi__err("bad interlace method", "Corrupt PNG");
+			if (!s->img_x || !s->img_y) return stbi__err("0-pixel image", "Corrupt PNG");
+			if (!pal_img_n) {
+				s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+				if ((1 << 30) / s->img_x / s->img_n < s->img_y)
+					return stbi__err("too large", "Image too large to decode");
+			} else {
+				// if paletted, then pal_n is our final components, and
+				// img_n is # components to decompress/filter.
+				s->img_n = 1;
+				if ((1 << 30) / s->img_x / 4 < s->img_y)
+					return stbi__err("too large", "Corrupt PNG");
+			}
+			// even with SCAN_header, have to scan to see if we have a tRNS
+			break;
+		}
+
+		case STBI__PNG_TYPE('P', 'L', 'T', 'E'): {
+			if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+			if (c.length > 256 * 3) return stbi__err("invalid PLTE", "Corrupt PNG");
+			pal_len = c.length / 3;
+			if (pal_len * 3 != c.length) return stbi__err("invalid PLTE", "Corrupt PNG");
+			for (i = 0; i < pal_len; ++i) {
+				palette[i * 4 + 0] = stbi__get8(s);
+				palette[i * 4 + 1] = stbi__get8(s);
+				palette[i * 4 + 2] = stbi__get8(s);
+				palette[i * 4 + 3] = 255;
+			}
+			break;
+		}
+
+		case STBI__PNG_TYPE('t', 'R', 'N', 'S'): {
+			if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+			if (z->idata) return stbi__err("tRNS after IDAT", "Corrupt PNG");
+			if (pal_img_n) {
+				if (scan == STBI__SCAN_header) {
+					s->img_n = 4;
+					return 1;
+				}
+				if (pal_len == 0) return stbi__err("tRNS before PLTE", "Corrupt PNG");
+				if (c.length > pal_len) return stbi__err("bad tRNS len", "Corrupt PNG");
+				pal_img_n = 4;
+				for (i = 0; i < c.length; ++i) palette[i * 4 + 3] = stbi__get8(s);
+			} else {
+				if (!(s->img_n & 1)) return stbi__err("tRNS with alpha", "Corrupt PNG");
+				if (c.length != (stbi__uint32)s->img_n * 2)
+					return stbi__err("bad tRNS len", "Corrupt PNG");
+				has_trans = 1;
+				// non-paletted with tRNS = constant alpha. if header-scanning,
+				// we can stop now.
+				if (scan == STBI__SCAN_header) {
+					++s->img_n;
+					return 1;
+				}
+				if (z->depth == 16) {
+					for (k = 0; k < s->img_n && k < 3;
+						 ++k) // extra loop test to suppress false GCC warning
+						tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
+				} else {
+					for (k = 0; k < s->img_n && k < 3; ++k)
+						tc[k] =
+							(stbi_uc)(stbi__get16be(s) & 255) *
+							stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
+				}
+			}
+			break;
+		}
+
+		case STBI__PNG_TYPE('I', 'D', 'A', 'T'): {
+			if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+			if (pal_img_n && !pal_len) return stbi__err("no PLTE", "Corrupt PNG");
+			if (scan == STBI__SCAN_header) {
+				// header scan definitely stops at first IDAT
+				if (pal_img_n) s->img_n = pal_img_n;
+				return 1;
+			}
+			if (c.length > (1u << 30))
+				return stbi__err("IDAT size limit", "IDAT section larger than 2^30 bytes");
+			if ((int)(ioff + c.length) < (int)ioff) return 0;
+			if (ioff + c.length > idata_limit) {
+				stbi__uint32 idata_limit_old = idata_limit;
+				stbi_uc *p;
+				if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
+				while (ioff + c.length > idata_limit) idata_limit *= 2;
+				STBI_NOTUSED(idata_limit_old);
+				p = (stbi_uc *)STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit);
+				if (p == NULL) return stbi__err("outofmem", "Out of memory");
+				z->idata = p;
+			}
+			if (!stbi__getn(s, z->idata + ioff, c.length))
+				return stbi__err("outofdata", "Corrupt PNG");
+			ioff += c.length;
+			break;
+		}
+
+		case STBI__PNG_TYPE('I', 'E', 'N', 'D'): {
+			stbi__uint32 raw_len, bpl;
+			if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+			if (scan != STBI__SCAN_load) return 1;
+			if (z->idata == NULL) return stbi__err("no IDAT", "Corrupt PNG");
+			// initial guess for decoded data size to avoid unnecessary reallocs
+			bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component
+			raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
+			z->expanded = (stbi_uc *)stbi_zlib_decode_malloc_guesssize_headerflag(
+				(char *)z->idata, ioff, raw_len, (int *)&raw_len, !is_iphone);
+			if (z->expanded == NULL) return 0; // zlib should set error
+			STBI_FREE(z->idata);
+			z->idata = NULL;
+			if ((req_comp == s->img_n + 1 && req_comp != 3 && !pal_img_n) || has_trans)
+				s->img_out_n = s->img_n + 1;
+			else
+				s->img_out_n = s->img_n;
+			if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color,
+										interlace))
+				return 0;
+			if (has_trans) {
+				if (z->depth == 16) {
+					if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0;
+				} else {
+					if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
+				}
+			}
+			if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2) stbi__de_iphone(z);
+			if (pal_img_n) {
+				// pal_img_n == 3 or 4
+				s->img_n = pal_img_n; // record the actual colors we had
+				s->img_out_n = pal_img_n;
+				if (req_comp >= 3) s->img_out_n = req_comp;
+				if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n)) return 0;
+			} else if (has_trans) {
+				// non-paletted image with tRNS -> source image has (constant)
+				// alpha
+				++s->img_n;
+			}
+			STBI_FREE(z->expanded);
+			z->expanded = NULL;
+			// end of PNG chunk, read and skip CRC
+			stbi__get32be(s);
+			return 1;
+		}
+
+		default:
+			// if critical, fail
+			if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+			if ((c.type & (1 << 29)) == 0) {
+#ifndef STBI_NO_FAILURE_STRINGS
+				// not threadsafe
+				static char invalid_chunk[] = "XXXX PNG chunk not known";
+				invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+				invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+				invalid_chunk[2] = STBI__BYTECAST(c.type >> 8);
+				invalid_chunk[3] = STBI__BYTECAST(c.type >> 0);
+#endif
+				return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+			}
+			stbi__skip(s, c.length);
+			break;
+		}
+		// end of PNG chunk, read and skip CRC
+		stbi__get32be(s);
+	}
+}
+
+static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp,
+						  stbi__result_info *ri) {
+	void *result = NULL;
+	if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+	if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
+		if (p->depth <= 8)
+			ri->bits_per_channel = 8;
+		else if (p->depth == 16)
+			ri->bits_per_channel = 16;
+		else
+			return stbi__errpuc("bad bits_per_channel",
+								"PNG not supported: unsupported color depth");
+		result = p->out;
+		p->out = NULL;
+		if (req_comp && req_comp != p->s->img_out_n) {
+			if (ri->bits_per_channel == 8)
+				result = stbi__convert_format((unsigned char *)result, p->s->img_out_n, req_comp,
+											  p->s->img_x, p->s->img_y);
+			else
+				result = stbi__convert_format16((stbi__uint16 *)result, p->s->img_out_n, req_comp,
+												p->s->img_x, p->s->img_y);
+			p->s->img_out_n = req_comp;
+			if (result == NULL) return result;
+		}
+		*x = p->s->img_x;
+		*y = p->s->img_y;
+		if (n) *n = p->s->img_n;
+	}
+	STBI_FREE(p->out);
+	p->out = NULL;
+	STBI_FREE(p->expanded);
+	p->expanded = NULL;
+	STBI_FREE(p->idata);
+	p->idata = NULL;
+
+	return result;
+}
+
+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri) {
+	stbi__png p;
+	p.s = s;
+	return stbi__do_png(&p, x, y, comp, req_comp, ri);
+}
+
+static int stbi__png_test(stbi__context *s) {
+	int r;
+	r = stbi__check_png_header(s);
+	stbi__rewind(s);
+	return r;
+}
+
+static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp) {
+	if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
+		stbi__rewind(p->s);
+		return 0;
+	}
+	if (x) *x = p->s->img_x;
+	if (y) *y = p->s->img_y;
+	if (comp) *comp = p->s->img_n;
+	return 1;
+}
+
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp) {
+	stbi__png p;
+	p.s = s;
+	return stbi__png_info_raw(&p, x, y, comp);
+}
+
+static int stbi__png_is16(stbi__context *s) {
+	stbi__png p;
+	p.s = s;
+	if (!stbi__png_info_raw(&p, NULL, NULL, NULL)) return 0;
+	if (p.depth != 16) {
+		stbi__rewind(p.s);
+		return 0;
+	}
+	return 1;
+}
+#endif
+
+// Microsoft/Windows BMP image
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test_raw(stbi__context *s) {
+	int r;
+	int sz;
+	if (stbi__get8(s) != 'B') return 0;
+	if (stbi__get8(s) != 'M') return 0;
+	stbi__get32le(s); // discard filesize
+	stbi__get16le(s); // discard reserved
+	stbi__get16le(s); // discard reserved
+	stbi__get32le(s); // discard data offset
+	sz = stbi__get32le(s);
+	r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+	return r;
+}
+
+static int stbi__bmp_test(stbi__context *s) {
+	int r = stbi__bmp_test_raw(s);
+	stbi__rewind(s);
+	return r;
+}
+
+// returns 0..31 for the highest set bit
+static int stbi__high_bit(unsigned int z) {
+	int n = 0;
+	if (z == 0) return -1;
+	if (z >= 0x10000) {
+		n += 16;
+		z >>= 16;
+	}
+	if (z >= 0x00100) {
+		n += 8;
+		z >>= 8;
+	}
+	if (z >= 0x00010) {
+		n += 4;
+		z >>= 4;
+	}
+	if (z >= 0x00004) {
+		n += 2;
+		z >>= 2;
+	}
+	if (z >= 0x00002) {
+		n += 1; /* >>=  1;*/
+	}
+	return n;
+}
+
+static int stbi__bitcount(unsigned int a) {
+	a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
+	a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
+	a = (a + (a >> 4)) & 0x0f0f0f0f;				// max 8 per 4, now 8 bits
+	a = (a + (a >> 8));								// max 16 per 8 bits
+	a = (a + (a >> 16));							// max 32 per 8 bits
+	return a & 0xff;
+}
+
+// extract an arbitrarily-aligned N-bit value (N=bits)
+// from v, and then make it 8-bits long and fractionally
+// extend it to full full range.
+static int stbi__shiftsigned(unsigned int v, int shift, int bits) {
+	static unsigned int mul_table[9] = {
+		0,
+		0xff /*0b11111111*/,
+		0x55 /*0b01010101*/,
+		0x49 /*0b01001001*/,
+		0x11 /*0b00010001*/,
+		0x21 /*0b00100001*/,
+		0x41 /*0b01000001*/,
+		0x81 /*0b10000001*/,
+		0x01 /*0b00000001*/,
+	};
+	static unsigned int shift_table[9] = {
+		0, 0, 0, 1, 0, 2, 4, 6, 0,
+	};
+	if (shift < 0)
+		v <<= -shift;
+	else
+		v >>= shift;
+	STBI_ASSERT(v < 256);
+	v >>= (8 - bits);
+	STBI_ASSERT(bits >= 0 && bits <= 8);
+	return (int)((unsigned)v * mul_table[bits]) >> shift_table[bits];
+}
+
+typedef struct {
+	int bpp, offset, hsz;
+	unsigned int mr, mg, mb, ma, all_a;
+	int extra_read;
+} stbi__bmp_data;
+
+static int stbi__bmp_set_mask_defaults(stbi__bmp_data *info, int compress) {
+	// BI_BITFIELDS specifies masks explicitly, don't override
+	if (compress == 3) return 1;
+
+	if (compress == 0) {
+		if (info->bpp == 16) {
+			info->mr = 31u << 10;
+			info->mg = 31u << 5;
+			info->mb = 31u << 0;
+		} else if (info->bpp == 32) {
+			info->mr = 0xffu << 16;
+			info->mg = 0xffu << 8;
+			info->mb = 0xffu << 0;
+			info->ma = 0xffu << 24;
+			info->all_a = 0; // if all_a is 0 at end, then we loaded alpha
+							 // channel but it was all 0
+		} else {
+			// otherwise, use defaults, which is all-0
+			info->mr = info->mg = info->mb = info->ma = 0;
+		}
+		return 1;
+	}
+	return 0; // error
+}
+
+static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info) {
+	int hsz;
+	if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
+	stbi__get32le(s); // discard filesize
+	stbi__get16le(s); // discard reserved
+	stbi__get16le(s); // discard reserved
+	info->offset = stbi__get32le(s);
+	info->hsz = hsz = stbi__get32le(s);
+	info->mr = info->mg = info->mb = info->ma = 0;
+	info->extra_read = 14;
+
+	if (info->offset < 0) return stbi__errpuc("bad BMP", "bad BMP");
+
+	if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124)
+		return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
+	if (hsz == 12) {
+		s->img_x = stbi__get16le(s);
+		s->img_y = stbi__get16le(s);
+	} else {
+		s->img_x = stbi__get32le(s);
+		s->img_y = stbi__get32le(s);
+	}
+	if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
+	info->bpp = stbi__get16le(s);
+	if (hsz != 12) {
+		int compress = stbi__get32le(s);
+		if (compress == 1 || compress == 2)
+			return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
+		if (compress >= 4)
+			return stbi__errpuc("BMP JPEG/PNG",
+								"BMP type not supported: unsupported compression"); // this
+																					// includes
+																					// PNG/JPEG
+																					// modes
+		if (compress == 3 && info->bpp != 16 && info->bpp != 32)
+			return stbi__errpuc("bad BMP", "bad BMP"); // bitfields requires 16 or 32 bits/pixel
+		stbi__get32le(s);							   // discard sizeof
+		stbi__get32le(s);							   // discard hres
+		stbi__get32le(s);							   // discard vres
+		stbi__get32le(s);							   // discard colorsused
+		stbi__get32le(s);							   // discard max important
+		if (hsz == 40 || hsz == 56) {
+			if (hsz == 56) {
+				stbi__get32le(s);
+				stbi__get32le(s);
+				stbi__get32le(s);
+				stbi__get32le(s);
+			}
+			if (info->bpp == 16 || info->bpp == 32) {
+				if (compress == 0) {
+					stbi__bmp_set_mask_defaults(info, compress);
+				} else if (compress == 3) {
+					info->mr = stbi__get32le(s);
+					info->mg = stbi__get32le(s);
+					info->mb = stbi__get32le(s);
+					info->extra_read += 12;
+					// not documented, but generated by photoshop and handled by
+					// mspaint
+					if (info->mr == info->mg && info->mg == info->mb) {
+						// ?!?!?
+						return stbi__errpuc("bad BMP", "bad BMP");
+					}
+				} else
+					return stbi__errpuc("bad BMP", "bad BMP");
+			}
+		} else {
+			// V4/V5 header
+			int i;
+			if (hsz != 108 && hsz != 124) return stbi__errpuc("bad BMP", "bad BMP");
+			info->mr = stbi__get32le(s);
+			info->mg = stbi__get32le(s);
+			info->mb = stbi__get32le(s);
+			info->ma = stbi__get32le(s);
+			if (compress != 3) // override mr/mg/mb unless in BI_BITFIELDS mode, as per docs
+				stbi__bmp_set_mask_defaults(info, compress);
+			stbi__get32le(s);						   // discard color space
+			for (i = 0; i < 12; ++i) stbi__get32le(s); // discard color space parameters
+			if (hsz == 124) {
+				stbi__get32le(s); // discard rendering intent
+				stbi__get32le(s); // discard offset of profile data
+				stbi__get32le(s); // discard size of profile data
+				stbi__get32le(s); // discard reserved
+			}
+		}
+	}
+	return (void *)1;
+}
+
+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri) {
+	stbi_uc *out;
+	unsigned int mr = 0, mg = 0, mb = 0, ma = 0, all_a;
+	stbi_uc pal[256][4];
+	int psize = 0, i, j, width;
+	int flip_vertically, pad, target;
+	stbi__bmp_data info;
+	STBI_NOTUSED(ri);
+
+	info.all_a = 255;
+	if (stbi__bmp_parse_header(s, &info) == NULL) return NULL; // error code already set
+
+	flip_vertically = ((int)s->img_y) > 0;
+	s->img_y = abs((int)s->img_y);
+
+	if (s->img_y > STBI_MAX_DIMENSIONS)
+		return stbi__errpuc("too large", "Very large image (corrupt?)");
+	if (s->img_x > STBI_MAX_DIMENSIONS)
+		return stbi__errpuc("too large", "Very large image (corrupt?)");
+
+	mr = info.mr;
+	mg = info.mg;
+	mb = info.mb;
+	ma = info.ma;
+	all_a = info.all_a;
+
+	if (info.hsz == 12) {
+		if (info.bpp < 24) psize = (info.offset - info.extra_read - 24) / 3;
+	} else {
+		if (info.bpp < 16) psize = (info.offset - info.extra_read - info.hsz) >> 2;
+	}
+	if (psize == 0) {
+		// accept some number of extra bytes after the header, but if the offset
+		// points either to before the header ends or implies a large amount of
+		// extra data, reject the file as malformed
+		int bytes_read_so_far =
+			s->callback_already_read + (int)(s->img_buffer - s->img_buffer_original);
+		int header_limit = 1024;		// max we actually read is below 256 bytes currently.
+		int extra_data_limit = 256 * 4; // what ordinarily goes here is a palette; 256 entries*4
+										// bytes is its max size.
+		if (bytes_read_so_far <= 0 || bytes_read_so_far > header_limit) {
+			return stbi__errpuc("bad header", "Corrupt BMP");
+		}
+		// we established that bytes_read_so_far is positive and sensible.
+		// the first half of this test rejects offsets that are either too small
+		// positives, or negative, and guarantees that info.offset >=
+		// bytes_read_so_far > 0. this in turn ensures the number computed in
+		// the second half of the test can't overflow.
+		if (info.offset < bytes_read_so_far || info.offset - bytes_read_so_far > extra_data_limit) {
+			return stbi__errpuc("bad offset", "Corrupt BMP");
+		} else {
+			stbi__skip(s, info.offset - bytes_read_so_far);
+		}
+	}
+
+	if (info.bpp == 24 && ma == 0xff000000)
+		s->img_n = 3;
+	else
+		s->img_n = ma ? 4 : 3;
+	if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+		target = req_comp;
+	else
+		target = s->img_n; // if they want monochrome, we'll post-convert
+
+	// sanity-check size
+	if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0))
+		return stbi__errpuc("too large", "Corrupt BMP");
+
+	out = (stbi_uc *)stbi__malloc_mad3(target, s->img_x, s->img_y, 0);
+	if (!out) return stbi__errpuc("outofmem", "Out of memory");
+	if (info.bpp < 16) {
+		int z = 0;
+		if (psize == 0 || psize > 256) {
+			STBI_FREE(out);
+			return stbi__errpuc("invalid", "Corrupt BMP");
+		}
+		for (i = 0; i < psize; ++i) {
+			pal[i][2] = stbi__get8(s);
+			pal[i][1] = stbi__get8(s);
+			pal[i][0] = stbi__get8(s);
+			if (info.hsz != 12) stbi__get8(s);
+			pal[i][3] = 255;
+		}
+		stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
+		if (info.bpp == 1)
+			width = (s->img_x + 7) >> 3;
+		else if (info.bpp == 4)
+			width = (s->img_x + 1) >> 1;
+		else if (info.bpp == 8)
+			width = s->img_x;
+		else {
+			STBI_FREE(out);
+			return stbi__errpuc("bad bpp", "Corrupt BMP");
+		}
+		pad = (-width) & 3;
+		if (info.bpp == 1) {
+			for (j = 0; j < (int)s->img_y; ++j) {
+				int bit_offset = 7, v = stbi__get8(s);
+				for (i = 0; i < (int)s->img_x; ++i) {
+					int color = (v >> bit_offset) & 0x1;
+					out[z++] = pal[color][0];
+					out[z++] = pal[color][1];
+					out[z++] = pal[color][2];
+					if (target == 4) out[z++] = 255;
+					if (i + 1 == (int)s->img_x) break;
+					if ((--bit_offset) < 0) {
+						bit_offset = 7;
+						v = stbi__get8(s);
+					}
+				}
+				stbi__skip(s, pad);
+			}
+		} else {
+			for (j = 0; j < (int)s->img_y; ++j) {
+				for (i = 0; i < (int)s->img_x; i += 2) {
+					int v = stbi__get8(s), v2 = 0;
+					if (info.bpp == 4) {
+						v2 = v & 15;
+						v >>= 4;
+					}
+					out[z++] = pal[v][0];
+					out[z++] = pal[v][1];
+					out[z++] = pal[v][2];
+					if (target == 4) out[z++] = 255;
+					if (i + 1 == (int)s->img_x) break;
+					v = (info.bpp == 8) ? stbi__get8(s) : v2;
+					out[z++] = pal[v][0];
+					out[z++] = pal[v][1];
+					out[z++] = pal[v][2];
+					if (target == 4) out[z++] = 255;
+				}
+				stbi__skip(s, pad);
+			}
+		}
+	} else {
+		int rshift = 0, gshift = 0, bshift = 0, ashift = 0, rcount = 0, gcount = 0, bcount = 0,
+			acount = 0;
+		int z = 0;
+		int easy = 0;
+		stbi__skip(s, info.offset - info.extra_read - info.hsz);
+		if (info.bpp == 24)
+			width = 3 * s->img_x;
+		else if (info.bpp == 16)
+			width = 2 * s->img_x;
+		else /* bpp = 32 and pad = 0 */
+			width = 0;
+		pad = (-width) & 3;
+		if (info.bpp == 24) {
+			easy = 1;
+		} else if (info.bpp == 32) {
+			if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) easy = 2;
+		}
+		if (!easy) {
+			if (!mr || !mg || !mb) {
+				STBI_FREE(out);
+				return stbi__errpuc("bad masks", "Corrupt BMP");
+			}
+			// right shift amt to put high bit in position #7
+			rshift = stbi__high_bit(mr) - 7;
+			rcount = stbi__bitcount(mr);
+			gshift = stbi__high_bit(mg) - 7;
+			gcount = stbi__bitcount(mg);
+			bshift = stbi__high_bit(mb) - 7;
+			bcount = stbi__bitcount(mb);
+			ashift = stbi__high_bit(ma) - 7;
+			acount = stbi__bitcount(ma);
+			if (rcount > 8 || gcount > 8 || bcount > 8 || acount > 8) {
+				STBI_FREE(out);
+				return stbi__errpuc("bad masks", "Corrupt BMP");
+			}
+		}
+		for (j = 0; j < (int)s->img_y; ++j) {
+			if (easy) {
+				for (i = 0; i < (int)s->img_x; ++i) {
+					unsigned char a;
+					out[z + 2] = stbi__get8(s);
+					out[z + 1] = stbi__get8(s);
+					out[z + 0] = stbi__get8(s);
+					z += 3;
+					a = (easy == 2 ? stbi__get8(s) : 255);
+					all_a |= a;
+					if (target == 4) out[z++] = a;
+				}
+			} else {
+				int bpp = info.bpp;
+				for (i = 0; i < (int)s->img_x; ++i) {
+					stbi__uint32 v =
+						(bpp == 16 ? (stbi__uint32)stbi__get16le(s) : stbi__get32le(s));
+					unsigned int a;
+					out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
+					out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
+					out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
+					a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+					all_a |= a;
+					if (target == 4) out[z++] = STBI__BYTECAST(a);
+				}
+			}
+			stbi__skip(s, pad);
+		}
+	}
+
+	// if alpha channel is all 0s, replace with all 255s
+	if (target == 4 && all_a == 0)
+		for (i = 4 * s->img_x * s->img_y - 1; i >= 0; i -= 4) out[i] = 255;
+
+	if (flip_vertically) {
+		stbi_uc t;
+		for (j = 0; j < (int)s->img_y >> 1; ++j) {
+			stbi_uc *p1 = out + j * s->img_x * target;
+			stbi_uc *p2 = out + (s->img_y - 1 - j) * s->img_x * target;
+			for (i = 0; i < (int)s->img_x * target; ++i) {
+				t = p1[i];
+				p1[i] = p2[i];
+				p2[i] = t;
+			}
+		}
+	}
+
+	if (req_comp && req_comp != target) {
+		out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+		if (out == NULL) return out; // stbi__convert_format frees input on failure
+	}
+
+	*x = s->img_x;
+	*y = s->img_y;
+	if (comp) *comp = s->img_n;
+	return out;
+}
+#endif
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+#ifndef STBI_NO_TGA
+// returns STBI_rgb or whatever, 0 on error
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int *is_rgb16) {
+	// only RGB or RGBA (incl. 16bit) or grey allowed
+	if (is_rgb16) *is_rgb16 = 0;
+	switch (bits_per_pixel) {
+	case 8:
+		return STBI_grey;
+	case 16:
+		if (is_grey) return STBI_grey_alpha;
+		// fallthrough
+	case 15:
+		if (is_rgb16) *is_rgb16 = 1;
+		return STBI_rgb;
+	case 24: // fallthrough
+	case 32:
+		return bits_per_pixel / 8;
+	default:
+		return 0;
+	}
+}
+
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp) {
+	int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+	int sz, tga_colormap_type;
+	stbi__get8(s);					   // discard Offset
+	tga_colormap_type = stbi__get8(s); // colormap type
+	if (tga_colormap_type > 1) {
+		stbi__rewind(s);
+		return 0; // only RGB or indexed allowed
+	}
+	tga_image_type = stbi__get8(s); // image type
+	if (tga_colormap_type == 1) {	// colormapped (paletted) image
+		if (tga_image_type != 1 && tga_image_type != 9) {
+			stbi__rewind(s);
+			return 0;
+		}
+		stbi__skip(s, 4);	// skip index of first colormap entry and number of entries
+		sz = stbi__get8(s); //   check bits per palette color entry
+		if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32)) {
+			stbi__rewind(s);
+			return 0;
+		}
+		stbi__skip(s, 4); // skip image x and y origin
+		tga_colormap_bpp = sz;
+	} else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
+		if ((tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) &&
+			(tga_image_type != 11)) {
+			stbi__rewind(s);
+			return 0; // only RGB or grey allowed, +/- RLE
+		}
+		stbi__skip(s, 9); // skip colormap specification and image x/y origin
+		tga_colormap_bpp = 0;
+	}
+	tga_w = stbi__get16le(s);
+	if (tga_w < 1) {
+		stbi__rewind(s);
+		return 0; // test width
+	}
+	tga_h = stbi__get16le(s);
+	if (tga_h < 1) {
+		stbi__rewind(s);
+		return 0; // test height
+	}
+	tga_bits_per_pixel = stbi__get8(s); // bits per pixel
+	stbi__get8(s);						// ignore alpha bits
+	if (tga_colormap_bpp != 0) {
+		if ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
+			// when using a colormap, tga_bits_per_pixel is the size of the
+			// indexes I don't think anything but 8 or 16bit indexes makes sense
+			stbi__rewind(s);
+			return 0;
+		}
+		tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
+	} else {
+		tga_comp = stbi__tga_get_comp(tga_bits_per_pixel,
+									  (tga_image_type == 3) || (tga_image_type == 11), NULL);
+	}
+	if (!tga_comp) {
+		stbi__rewind(s);
+		return 0;
+	}
+	if (x) *x = tga_w;
+	if (y) *y = tga_h;
+	if (comp) *comp = tga_comp;
+	return 1; // seems to have passed everything
+}
+
+static int stbi__tga_test(stbi__context *s) {
+	int res = 0;
+	int sz, tga_color_type;
+	stbi__get8(s);							   //   discard Offset
+	tga_color_type = stbi__get8(s);			   //   color type
+	if (tga_color_type > 1) goto errorEnd;	   //   only RGB or indexed allowed
+	sz = stbi__get8(s);						   //   image type
+	if (tga_color_type == 1) {				   // colormapped (paletted) image
+		if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
+		stbi__skip(s, 4);	// skip index of first colormap entry and number of entries
+		sz = stbi__get8(s); //   check bits per palette color entry
+		if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32)) goto errorEnd;
+		stbi__skip(s, 4); // skip image x and y origin
+	} else {			  // "normal" image w/o colormap
+		if ((sz != 2) && (sz != 3) && (sz != 10) && (sz != 11))
+			goto errorEnd; // only RGB or grey allowed, +/- RLE
+		stbi__skip(s, 9);  // skip colormap specification and image x/y origin
+	}
+	if (stbi__get16le(s) < 1) goto errorEnd; //   test width
+	if (stbi__get16le(s) < 1) goto errorEnd; //   test height
+	sz = stbi__get8(s);						 //   bits per pixel
+	if ((tga_color_type == 1) && (sz != 8) && (sz != 16))
+		goto errorEnd; // for colormapped images, bpp is size of an index
+	if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32)) goto errorEnd;
+
+	res = 1; // if we got this far, everything's good and we can return 1
+			 // instead of 0
+
+errorEnd:
+	stbi__rewind(s);
+	return res;
+}
+
+// read 16bit value and convert to 24bit RGB
+static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc *out) {
+	stbi__uint16 px = (stbi__uint16)stbi__get16le(s);
+	stbi__uint16 fiveBitMask = 31;
+	// we have 3 channels with 5bits each
+	int r = (px >> 10) & fiveBitMask;
+	int g = (px >> 5) & fiveBitMask;
+	int b = px & fiveBitMask;
+	// Note that this saves the data in RGB(A) order, so it doesn't need to be
+	// swapped later
+	out[0] = (stbi_uc)((r * 255) / 31);
+	out[1] = (stbi_uc)((g * 255) / 31);
+	out[2] = (stbi_uc)((b * 255) / 31);
+
+	// some people claim that the most significant bit might be used for alpha
+	// (possibly if an alpha-bit is set in the "image descriptor byte")
+	// but that only made 16bit test images completely translucent..
+	// so let's treat all 15 and 16bit TGAs as RGB with no alpha.
+}
+
+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri) {
+	//   read in the TGA header stuff
+	int tga_offset = stbi__get8(s);
+	int tga_indexed = stbi__get8(s);
+	int tga_image_type = stbi__get8(s);
+	int tga_is_RLE = 0;
+	int tga_palette_start = stbi__get16le(s);
+	int tga_palette_len = stbi__get16le(s);
+	int tga_palette_bits = stbi__get8(s);
+	int tga_x_origin = stbi__get16le(s);
+	int tga_y_origin = stbi__get16le(s);
+	int tga_width = stbi__get16le(s);
+	int tga_height = stbi__get16le(s);
+	int tga_bits_per_pixel = stbi__get8(s);
+	int tga_comp, tga_rgb16 = 0;
+	int tga_inverted = stbi__get8(s);
+	// int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused
+	// (useless?)
+	//   image data
+	unsigned char *tga_data;
+	unsigned char *tga_palette = NULL;
+	int i, j;
+	unsigned char raw_data[4] = {0};
+	int RLE_count = 0;
+	int RLE_repeating = 0;
+	int read_next_pixel = 1;
+	STBI_NOTUSED(ri);
+	STBI_NOTUSED(tga_x_origin); // @TODO
+	STBI_NOTUSED(tga_y_origin); // @TODO
+
+	if (tga_height > STBI_MAX_DIMENSIONS)
+		return stbi__errpuc("too large", "Very large image (corrupt?)");
+	if (tga_width > STBI_MAX_DIMENSIONS)
+		return stbi__errpuc("too large", "Very large image (corrupt?)");
+
+	//   do a tiny bit of precessing
+	if (tga_image_type >= 8) {
+		tga_image_type -= 8;
+		tga_is_RLE = 1;
+	}
+	tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+	//   If I'm paletted, then I'll use the number of bits from the palette
+	if (tga_indexed)
+		tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
+	else
+		tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
+
+	if (!tga_comp) // shouldn't really happen, stbi__tga_test() should have
+				   // ensured basic consistency
+		return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
+
+	//   tga info
+	*x = tga_width;
+	*y = tga_height;
+	if (comp) *comp = tga_comp;
+
+	if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0))
+		return stbi__errpuc("too large", "Corrupt TGA");
+
+	tga_data = (unsigned char *)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
+	if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
+
+	// skip to the data's starting position (offset usually = 0)
+	stbi__skip(s, tga_offset);
+
+	if (!tga_indexed && !tga_is_RLE && !tga_rgb16) {
+		for (i = 0; i < tga_height; ++i) {
+			int row = tga_inverted ? tga_height - i - 1 : i;
+			stbi_uc *tga_row = tga_data + row * tga_width * tga_comp;
+			stbi__getn(s, tga_row, tga_width * tga_comp);
+		}
+	} else {
+		//   do I need to load a palette?
+		if (tga_indexed) {
+			if (tga_palette_len == 0) { /* you have to have at least one entry! */
+				STBI_FREE(tga_data);
+				return stbi__errpuc("bad palette", "Corrupt TGA");
+			}
+
+			//   any data to skip? (offset usually = 0)
+			stbi__skip(s, tga_palette_start);
+			//   load the palette
+			tga_palette = (unsigned char *)stbi__malloc_mad2(tga_palette_len, tga_comp, 0);
+			if (!tga_palette) {
+				STBI_FREE(tga_data);
+				return stbi__errpuc("outofmem", "Out of memory");
+			}
+			if (tga_rgb16) {
+				stbi_uc *pal_entry = tga_palette;
+				STBI_ASSERT(tga_comp == STBI_rgb);
+				for (i = 0; i < tga_palette_len; ++i) {
+					stbi__tga_read_rgb16(s, pal_entry);
+					pal_entry += tga_comp;
+				}
+			} else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
+				STBI_FREE(tga_data);
+				STBI_FREE(tga_palette);
+				return stbi__errpuc("bad palette", "Corrupt TGA");
+			}
+		}
+		//   load the data
+		for (i = 0; i < tga_width * tga_height; ++i) {
+			//   if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+			if (tga_is_RLE) {
+				if (RLE_count == 0) {
+					//   yep, get the next byte as a RLE command
+					int RLE_cmd = stbi__get8(s);
+					RLE_count = 1 + (RLE_cmd & 127);
+					RLE_repeating = RLE_cmd >> 7;
+					read_next_pixel = 1;
+				} else if (!RLE_repeating) {
+					read_next_pixel = 1;
+				}
+			} else {
+				read_next_pixel = 1;
+			}
+			//   OK, if I need to read a pixel, do it now
+			if (read_next_pixel) {
+				//   load however much data we did have
+				if (tga_indexed) {
+					// read in index, then perform the lookup
+					int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
+					if (pal_idx >= tga_palette_len) {
+						// invalid index
+						pal_idx = 0;
+					}
+					pal_idx *= tga_comp;
+					for (j = 0; j < tga_comp; ++j) {
+						raw_data[j] = tga_palette[pal_idx + j];
+					}
+				} else if (tga_rgb16) {
+					STBI_ASSERT(tga_comp == STBI_rgb);
+					stbi__tga_read_rgb16(s, raw_data);
+				} else {
+					//   read in the data raw
+					for (j = 0; j < tga_comp; ++j) {
+						raw_data[j] = stbi__get8(s);
+					}
+				}
+				//   clear the reading flag for the next pixel
+				read_next_pixel = 0;
+			} // end of reading a pixel
+
+			// copy data
+			for (j = 0; j < tga_comp; ++j) tga_data[i * tga_comp + j] = raw_data[j];
+
+			//   in case we're in RLE mode, keep counting down
+			--RLE_count;
+		}
+		//   do I need to invert the image?
+		if (tga_inverted) {
+			for (j = 0; j * 2 < tga_height; ++j) {
+				int index1 = j * tga_width * tga_comp;
+				int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+				for (i = tga_width * tga_comp; i > 0; --i) {
+					unsigned char temp = tga_data[index1];
+					tga_data[index1] = tga_data[index2];
+					tga_data[index2] = temp;
+					++index1;
+					++index2;
+				}
+			}
+		}
+		//   clear my palette, if I had one
+		if (tga_palette != NULL) {
+			STBI_FREE(tga_palette);
+		}
+	}
+
+	// swap RGB - if the source data was RGB16, it already is in the right order
+	if (tga_comp >= 3 && !tga_rgb16) {
+		unsigned char *tga_pixel = tga_data;
+		for (i = 0; i < tga_width * tga_height; ++i) {
+			unsigned char temp = tga_pixel[0];
+			tga_pixel[0] = tga_pixel[2];
+			tga_pixel[2] = temp;
+			tga_pixel += tga_comp;
+		}
+	}
+
+	// convert to target component count
+	if (req_comp && req_comp != tga_comp)
+		tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
+
+	//   the things I do to get rid of an error message, and yet keep
+	//   Microsoft's C compilers happy... [8^(
+	tga_palette_start = tga_palette_len = tga_palette_bits = tga_x_origin = tga_y_origin = 0;
+	STBI_NOTUSED(tga_palette_start);
+	//   OK, done
+	return tga_data;
+}
+#endif
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz,
+// tweaked by STB
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s) {
+	int r = (stbi__get32be(s) == 0x38425053);
+	stbi__rewind(s);
+	return r;
+}
+
+static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount) {
+	int count, nleft, len;
+
+	count = 0;
+	while ((nleft = pixelCount - count) > 0) {
+		len = stbi__get8(s);
+		if (len == 128) {
+			// No-op.
+		} else if (len < 128) {
+			// Copy next len+1 bytes literally.
+			len++;
+			if (len > nleft) return 0; // corrupt data
+			count += len;
+			while (len) {
+				*p = stbi__get8(s);
+				p += 4;
+				len--;
+			}
+		} else if (len > 128) {
+			stbi_uc val;
+			// Next -len+1 bytes in the dest are replicated from next source
+			// byte. (Interpret len as a negative 8-bit int.)
+			len = 257 - len;
+			if (len > nleft) return 0; // corrupt data
+			val = stbi__get8(s);
+			count += len;
+			while (len) {
+				*p = val;
+				p += 4;
+				len--;
+			}
+		}
+	}
+
+	return 1;
+}
+
+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri, int bpc) {
+	int pixelCount;
+	int channelCount, compression;
+	int channel, i;
+	int bitdepth;
+	int w, h;
+	stbi_uc *out;
+	STBI_NOTUSED(ri);
+
+	// Check identifier
+	if (stbi__get32be(s) != 0x38425053) // "8BPS"
+		return stbi__errpuc("not PSD", "Corrupt PSD image");
+
+	// Check file type version.
+	if (stbi__get16be(s) != 1)
+		return stbi__errpuc("wrong version", "Unsupported version of PSD image");
+
+	// Skip 6 reserved bytes.
+	stbi__skip(s, 6);
+
+	// Read the number of channels (R, G, B, A, etc).
+	channelCount = stbi__get16be(s);
+	if (channelCount < 0 || channelCount > 16)
+		return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
+
+	// Read the rows and columns of the image.
+	h = stbi__get32be(s);
+	w = stbi__get32be(s);
+
+	if (h > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large", "Very large image (corrupt?)");
+	if (w > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large", "Very large image (corrupt?)");
+
+	// Make sure the depth is 8 bits.
+	bitdepth = stbi__get16be(s);
+	if (bitdepth != 8 && bitdepth != 16)
+		return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
+
+	// Make sure the color mode is RGB.
+	// Valid options are:
+	//   0: Bitmap
+	//   1: Grayscale
+	//   2: Indexed color
+	//   3: RGB color
+	//   4: CMYK color
+	//   7: Multichannel
+	//   8: Duotone
+	//   9: Lab color
+	if (stbi__get16be(s) != 3)
+		return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
+
+	// Skip the Mode Data.  (It's the palette for indexed color; other info for
+	// other modes.)
+	stbi__skip(s, stbi__get32be(s));
+
+	// Skip the image resources.  (resolution, pen tool paths, etc)
+	stbi__skip(s, stbi__get32be(s));
+
+	// Skip the reserved data.
+	stbi__skip(s, stbi__get32be(s));
+
+	// Find out if the data is compressed.
+	// Known values:
+	//   0: no compression
+	//   1: RLE compressed
+	compression = stbi__get16be(s);
+	if (compression > 1)
+		return stbi__errpuc("bad compression", "PSD has an unknown compression format");
+
+	// Check size
+	if (!stbi__mad3sizes_valid(4, w, h, 0)) return stbi__errpuc("too large", "Corrupt PSD");
+
+	// Create the destination image.
+
+	if (!compression && bitdepth == 16 && bpc == 16) {
+		out = (stbi_uc *)stbi__malloc_mad3(8, w, h, 0);
+		ri->bits_per_channel = 16;
+	} else
+		out = (stbi_uc *)stbi__malloc(4 * w * h);
+
+	if (!out) return stbi__errpuc("outofmem", "Out of memory");
+	pixelCount = w * h;
+
+	// Initialize the data to zero.
+	// memset( out, 0, pixelCount * 4 );
+
+	// Finally, the image data.
+	if (compression) {
+		// RLE as used by .PSD and .TIFF
+		// Loop until you get the number of unpacked bytes you are expecting:
+		//     Read the next source byte into n.
+		//     If n is between 0 and 127 inclusive, copy the next n+1 bytes
+		//     literally. Else if n is between -127 and -1 inclusive, copy the
+		//     next byte -n+1 times. Else if n is 128, noop.
+		// Endloop
+
+		// The RLE-compressed data is preceded by a 2-byte data count for each
+		// row in the data, which we're going to just skip.
+		stbi__skip(s, h * channelCount * 2);
+
+		// Read the RLE data by channel.
+		for (channel = 0; channel < 4; channel++) {
+			stbi_uc *p;
+
+			p = out + channel;
+			if (channel >= channelCount) {
+				// Fill this channel with default data.
+				for (i = 0; i < pixelCount; i++, p += 4) *p = (channel == 3 ? 255 : 0);
+			} else {
+				// Read the RLE data.
+				if (!stbi__psd_decode_rle(s, p, pixelCount)) {
+					STBI_FREE(out);
+					return stbi__errpuc("corrupt", "bad RLE data");
+				}
+			}
+		}
+
+	} else {
+		// We're at the raw image data.  It's each channel in order (Red, Green,
+		// Blue, Alpha, ...) where each channel consists of an 8-bit (or 16-bit)
+		// value for each pixel in the image.
+
+		// Read the data by channel.
+		for (channel = 0; channel < 4; channel++) {
+			if (channel >= channelCount) {
+				// Fill this channel with default data.
+				if (bitdepth == 16 && bpc == 16) {
+					stbi__uint16 *q = ((stbi__uint16 *)out) + channel;
+					stbi__uint16 val = channel == 3 ? 65535 : 0;
+					for (i = 0; i < pixelCount; i++, q += 4) *q = val;
+				} else {
+					stbi_uc *p = out + channel;
+					stbi_uc val = channel == 3 ? 255 : 0;
+					for (i = 0; i < pixelCount; i++, p += 4) *p = val;
+				}
+			} else {
+				if (ri->bits_per_channel == 16) { // output bpc
+					stbi__uint16 *q = ((stbi__uint16 *)out) + channel;
+					for (i = 0; i < pixelCount; i++, q += 4) *q = (stbi__uint16)stbi__get16be(s);
+				} else {
+					stbi_uc *p = out + channel;
+					if (bitdepth == 16) { // input bpc
+						for (i = 0; i < pixelCount; i++, p += 4)
+							*p = (stbi_uc)(stbi__get16be(s) >> 8);
+					} else {
+						for (i = 0; i < pixelCount; i++, p += 4) *p = stbi__get8(s);
+					}
+				}
+			}
+		}
+	}
+
+	// remove weird white matte from PSD
+	if (channelCount >= 4) {
+		if (ri->bits_per_channel == 16) {
+			for (i = 0; i < w * h; ++i) {
+				stbi__uint16 *pixel = (stbi__uint16 *)out + 4 * i;
+				if (pixel[3] != 0 && pixel[3] != 65535) {
+					float a = pixel[3] / 65535.0f;
+					float ra = 1.0f / a;
+					float inv_a = 65535.0f * (1 - ra);
+					pixel[0] = (stbi__uint16)(pixel[0] * ra + inv_a);
+					pixel[1] = (stbi__uint16)(pixel[1] * ra + inv_a);
+					pixel[2] = (stbi__uint16)(pixel[2] * ra + inv_a);
+				}
+			}
+		} else {
+			for (i = 0; i < w * h; ++i) {
+				unsigned char *pixel = out + 4 * i;
+				if (pixel[3] != 0 && pixel[3] != 255) {
+					float a = pixel[3] / 255.0f;
+					float ra = 1.0f / a;
+					float inv_a = 255.0f * (1 - ra);
+					pixel[0] = (unsigned char)(pixel[0] * ra + inv_a);
+					pixel[1] = (unsigned char)(pixel[1] * ra + inv_a);
+					pixel[2] = (unsigned char)(pixel[2] * ra + inv_a);
+				}
+			}
+		}
+	}
+
+	// convert to desired output format
+	if (req_comp && req_comp != 4) {
+		if (ri->bits_per_channel == 16)
+			out = (stbi_uc *)stbi__convert_format16((stbi__uint16 *)out, 4, req_comp, w, h);
+		else
+			out = stbi__convert_format(out, 4, req_comp, w, h);
+		if (out == NULL) return out; // stbi__convert_format frees input on failure
+	}
+
+	if (comp) *comp = 4;
+	*y = h;
+	*x = w;
+
+	return out;
+}
+#endif
+
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_is4(stbi__context *s, const char *str) {
+	int i;
+	for (i = 0; i < 4; ++i)
+		if (stbi__get8(s) != (stbi_uc)str[i]) return 0;
+
+	return 1;
+}
+
+static int stbi__pic_test_core(stbi__context *s) {
+	int i;
+
+	if (!stbi__pic_is4(s, "\x53\x80\xF6\x34")) return 0;
+
+	for (i = 0; i < 84; ++i) stbi__get8(s);
+
+	if (!stbi__pic_is4(s, "PICT")) return 0;
+
+	return 1;
+}
+
+typedef struct {
+	stbi_uc size, type, channel;
+} stbi__pic_packet;
+
+static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest) {
+	int mask = 0x80, i;
+
+	for (i = 0; i < 4; ++i, mask >>= 1) {
+		if (channel & mask) {
+			if (stbi__at_eof(s)) return stbi__errpuc("bad file", "PIC file too short");
+			dest[i] = stbi__get8(s);
+		}
+	}
+
+	return dest;
+}
+
+static void stbi__copyval(int channel, stbi_uc *dest, const stbi_uc *src) {
+	int mask = 0x80, i;
+
+	for (i = 0; i < 4; ++i, mask >>= 1)
+		if (channel & mask) dest[i] = src[i];
+}
+
+static stbi_uc *stbi__pic_load_core(stbi__context *s, int width, int height, int *comp,
+									stbi_uc *result) {
+	int act_comp = 0, num_packets = 0, y, chained;
+	stbi__pic_packet packets[10];
+
+	// this will (should...) cater for even some bizarre stuff like having data
+	// for the same channel in multiple packets.
+	do {
+		stbi__pic_packet *packet;
+
+		if (num_packets == sizeof(packets) / sizeof(packets[0]))
+			return stbi__errpuc("bad format", "too many packets");
+
+		packet = &packets[num_packets++];
+
+		chained = stbi__get8(s);
+		packet->size = stbi__get8(s);
+		packet->type = stbi__get8(s);
+		packet->channel = stbi__get8(s);
+
+		act_comp |= packet->channel;
+
+		if (stbi__at_eof(s)) return stbi__errpuc("bad file", "file too short (reading packets)");
+		if (packet->size != 8) return stbi__errpuc("bad format", "packet isn't 8bpp");
+	} while (chained);
+
+	*comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+
+	for (y = 0; y < height; ++y) {
+		int packet_idx;
+
+		for (packet_idx = 0; packet_idx < num_packets; ++packet_idx) {
+			stbi__pic_packet *packet = &packets[packet_idx];
+			stbi_uc *dest = result + y * width * 4;
+
+			switch (packet->type) {
+			default:
+				return stbi__errpuc("bad format", "packet has bad compression type");
+
+			case 0: { // uncompressed
+				int x;
+
+				for (x = 0; x < width; ++x, dest += 4)
+					if (!stbi__readval(s, packet->channel, dest)) return 0;
+				break;
+			}
+
+			case 1: // Pure RLE
+			{
+				int left = width, i;
+
+				while (left > 0) {
+					stbi_uc count, value[4];
+
+					count = stbi__get8(s);
+					if (stbi__at_eof(s))
+						return stbi__errpuc("bad file", "file too short (pure read count)");
+
+					if (count > left) count = (stbi_uc)left;
+
+					if (!stbi__readval(s, packet->channel, value)) return 0;
+
+					for (i = 0; i < count; ++i, dest += 4)
+						stbi__copyval(packet->channel, dest, value);
+					left -= count;
+				}
+			} break;
+
+			case 2: { // Mixed RLE
+				int left = width;
+				while (left > 0) {
+					int count = stbi__get8(s), i;
+					if (stbi__at_eof(s))
+						return stbi__errpuc("bad file", "file too short (mixed read count)");
+
+					if (count >= 128) { // Repeated
+						stbi_uc value[4];
+
+						if (count == 128)
+							count = stbi__get16be(s);
+						else
+							count -= 127;
+						if (count > left) return stbi__errpuc("bad file", "scanline overrun");
+
+						if (!stbi__readval(s, packet->channel, value)) return 0;
+
+						for (i = 0; i < count; ++i, dest += 4)
+							stbi__copyval(packet->channel, dest, value);
+					} else { // Raw
+						++count;
+						if (count > left) return stbi__errpuc("bad file", "scanline overrun");
+
+						for (i = 0; i < count; ++i, dest += 4)
+							if (!stbi__readval(s, packet->channel, dest)) return 0;
+					}
+					left -= count;
+				}
+				break;
+			}
+			}
+		}
+	}
+
+	return result;
+}
+
+static void *stbi__pic_load(stbi__context *s, int *px, int *py, int *comp, int req_comp,
+							stbi__result_info *ri) {
+	stbi_uc *result;
+	int i, x, y, internal_comp;
+	STBI_NOTUSED(ri);
+
+	if (!comp) comp = &internal_comp;
+
+	for (i = 0; i < 92; ++i) stbi__get8(s);
+
+	x = stbi__get16be(s);
+	y = stbi__get16be(s);
+
+	if (y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large", "Very large image (corrupt?)");
+	if (x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large", "Very large image (corrupt?)");
+
+	if (stbi__at_eof(s)) return stbi__errpuc("bad file", "file too short (pic header)");
+	if (!stbi__mad3sizes_valid(x, y, 4, 0))
+		return stbi__errpuc("too large", "PIC image too large to decode");
+
+	stbi__get32be(s); // skip `ratio'
+	stbi__get16be(s); // skip `fields'
+	stbi__get16be(s); // skip `pad'
+
+	// intermediate buffer is RGBA
+	result = (stbi_uc *)stbi__malloc_mad3(x, y, 4, 0);
+	if (!result) return stbi__errpuc("outofmem", "Out of memory");
+	memset(result, 0xff, x * y * 4);
+
+	if (!stbi__pic_load_core(s, x, y, comp, result)) {
+		STBI_FREE(result);
+		result = 0;
+	}
+	*px = x;
+	*py = y;
+	if (req_comp == 0) req_comp = *comp;
+	result = stbi__convert_format(result, 4, req_comp, x, y);
+
+	return result;
+}
+
+static int stbi__pic_test(stbi__context *s) {
+	int r = stbi__pic_test_core(s);
+	stbi__rewind(s);
+	return r;
+}
+#endif
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+
+#ifndef STBI_NO_GIF
+typedef struct {
+	stbi__int16 prefix;
+	stbi_uc first;
+	stbi_uc suffix;
+} stbi__gif_lzw;
+
+typedef struct {
+	int w, h;
+	stbi_uc *out;		 // output buffer (always 4 components)
+	stbi_uc *background; // The current "background" as far as a gif is concerned
+	stbi_uc *history;
+	int flags, bgindex, ratio, transparent, eflags;
+	stbi_uc pal[256][4];
+	stbi_uc lpal[256][4];
+	stbi__gif_lzw codes[8192];
+	stbi_uc *color_table;
+	int parse, step;
+	int lflags;
+	int start_x, start_y;
+	int max_x, max_y;
+	int cur_x, cur_y;
+	int line_size;
+	int delay;
+} stbi__gif;
+
+static int stbi__gif_test_raw(stbi__context *s) {
+	int sz;
+	if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' ||
+		stbi__get8(s) != '8')
+		return 0;
+	sz = stbi__get8(s);
+	if (sz != '9' && sz != '7') return 0;
+	if (stbi__get8(s) != 'a') return 0;
+	return 1;
+}
+
+static int stbi__gif_test(stbi__context *s) {
+	int r = stbi__gif_test_raw(s);
+	stbi__rewind(s);
+	return r;
+}
+
+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries,
+									   int transp) {
+	int i;
+	for (i = 0; i < num_entries; ++i) {
+		pal[i][2] = stbi__get8(s);
+		pal[i][1] = stbi__get8(s);
+		pal[i][0] = stbi__get8(s);
+		pal[i][3] = transp == i ? 0 : 255;
+	}
+}
+
+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info) {
+	stbi_uc version;
+	if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' ||
+		stbi__get8(s) != '8')
+		return stbi__err("not GIF", "Corrupt GIF");
+
+	version = stbi__get8(s);
+	if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF");
+	if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF");
+
+	stbi__g_failure_reason = "";
+	g->w = stbi__get16le(s);
+	g->h = stbi__get16le(s);
+	g->flags = stbi__get8(s);
+	g->bgindex = stbi__get8(s);
+	g->ratio = stbi__get8(s);
+	g->transparent = -1;
+
+	if (g->w > STBI_MAX_DIMENSIONS) return stbi__err("too large", "Very large image (corrupt?)");
+	if (g->h > STBI_MAX_DIMENSIONS) return stbi__err("too large", "Very large image (corrupt?)");
+
+	if (comp != 0)
+		*comp = 4; // can't actually tell whether it's 3 or 4 until we parse the
+				   // comments
+
+	if (is_info) return 1;
+
+	if (g->flags & 0x80) stbi__gif_parse_colortable(s, g->pal, 2 << (g->flags & 7), -1);
+
+	return 1;
+}
+
+static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp) {
+	stbi__gif *g = (stbi__gif *)stbi__malloc(sizeof(stbi__gif));
+	if (!g) return stbi__err("outofmem", "Out of memory");
+	if (!stbi__gif_header(s, g, comp, 1)) {
+		STBI_FREE(g);
+		stbi__rewind(s);
+		return 0;
+	}
+	if (x) *x = g->w;
+	if (y) *y = g->h;
+	STBI_FREE(g);
+	return 1;
+}
+
+static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code) {
+	stbi_uc *p, *c;
+	int idx;
+
+	// recurse to decode the prefixes, since the linked-list is backwards,
+	// and working backwards through an interleaved image would be nasty
+	if (g->codes[code].prefix >= 0) stbi__out_gif_code(g, g->codes[code].prefix);
+
+	if (g->cur_y >= g->max_y) return;
+
+	idx = g->cur_x + g->cur_y;
+	p = &g->out[idx];
+	g->history[idx / 4] = 1;
+
+	c = &g->color_table[g->codes[code].suffix * 4];
+	if (c[3] > 128) { // don't render transparent pixels;
+		p[0] = c[2];
+		p[1] = c[1];
+		p[2] = c[0];
+		p[3] = c[3];
+	}
+	g->cur_x += 4;
+
+	if (g->cur_x >= g->max_x) {
+		g->cur_x = g->start_x;
+		g->cur_y += g->step;
+
+		while (g->cur_y >= g->max_y && g->parse > 0) {
+			g->step = (1 << g->parse) * g->line_size;
+			g->cur_y = g->start_y + (g->step >> 1);
+			--g->parse;
+		}
+	}
+}
+
+static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g) {
+	stbi_uc lzw_cs;
+	stbi__int32 len, init_code;
+	stbi__uint32 first;
+	stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+	stbi__gif_lzw *p;
+
+	lzw_cs = stbi__get8(s);
+	if (lzw_cs > 12) return NULL;
+	clear = 1 << lzw_cs;
+	first = 1;
+	codesize = lzw_cs + 1;
+	codemask = (1 << codesize) - 1;
+	bits = 0;
+	valid_bits = 0;
+	for (init_code = 0; init_code < clear; init_code++) {
+		g->codes[init_code].prefix = -1;
+		g->codes[init_code].first = (stbi_uc)init_code;
+		g->codes[init_code].suffix = (stbi_uc)init_code;
+	}
+
+	// support no starting clear code
+	avail = clear + 2;
+	oldcode = -1;
+
+	len = 0;
+	for (;;) {
+		if (valid_bits < codesize) {
+			if (len == 0) {
+				len = stbi__get8(s); // start new block
+				if (len == 0) return g->out;
+			}
+			--len;
+			bits |= (stbi__int32)stbi__get8(s) << valid_bits;
+			valid_bits += 8;
+		} else {
+			stbi__int32 code = bits & codemask;
+			bits >>= codesize;
+			valid_bits -= codesize;
+			// @OPTIMIZE: is there some way we can accelerate the non-clear
+			// path?
+			if (code == clear) { // clear code
+				codesize = lzw_cs + 1;
+				codemask = (1 << codesize) - 1;
+				avail = clear + 2;
+				oldcode = -1;
+				first = 0;
+			} else if (code == clear + 1) { // end of stream code
+				stbi__skip(s, len);
+				while ((len = stbi__get8(s)) > 0) stbi__skip(s, len);
+				return g->out;
+			} else if (code <= avail) {
+				if (first) {
+					return stbi__errpuc("no clear code", "Corrupt GIF");
+				}
+
+				if (oldcode >= 0) {
+					p = &g->codes[avail++];
+					if (avail > 8192) {
+						return stbi__errpuc("too many codes", "Corrupt GIF");
+					}
+
+					p->prefix = (stbi__int16)oldcode;
+					p->first = g->codes[oldcode].first;
+					p->suffix = (code == avail) ? p->first : g->codes[code].first;
+				} else if (code == avail)
+					return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+
+				stbi__out_gif_code(g, (stbi__uint16)code);
+
+				if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+					codesize++;
+					codemask = (1 << codesize) - 1;
+				}
+
+				oldcode = code;
+			} else {
+				return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+			}
+		}
+	}
+}
+
+// this function is designed to support animated gifs, although stb_image
+// doesn't support it two back is the image from two frames ago, used for a very
+// specific disposal format
+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp,
+									stbi_uc *two_back) {
+	int dispose;
+	int first_frame;
+	int pi;
+	int pcount;
+	STBI_NOTUSED(req_comp);
+
+	// on first frame, any non-written pixels get the background colour
+	// (non-transparent)
+	first_frame = 0;
+	if (g->out == 0) {
+		if (!stbi__gif_header(s, g, comp, 0))
+			return 0; // stbi__g_failure_reason set by stbi__gif_header
+		if (!stbi__mad3sizes_valid(4, g->w, g->h, 0))
+			return stbi__errpuc("too large", "GIF image is too large");
+		pcount = g->w * g->h;
+		g->out = (stbi_uc *)stbi__malloc(4 * pcount);
+		g->background = (stbi_uc *)stbi__malloc(4 * pcount);
+		g->history = (stbi_uc *)stbi__malloc(pcount);
+		if (!g->out || !g->background || !g->history)
+			return stbi__errpuc("outofmem", "Out of memory");
+
+		// image is treated as "transparent" at the start - ie, nothing
+		// overwrites the current background; background colour is only used for
+		// pixels that are not rendered first frame, after that "background"
+		// color refers to the color that was there the previous frame.
+		memset(g->out, 0x00, 4 * pcount);
+		memset(g->background, 0x00,
+			   4 * pcount); // state of the background (starts transparent)
+		memset(g->history, 0x00,
+			   pcount); // pixels that were affected previous frame
+		first_frame = 1;
+	} else {
+		// second frame - how do we dispose of the previous one?
+		dispose = (g->eflags & 0x1C) >> 2;
+		pcount = g->w * g->h;
+
+		if ((dispose == 3) && (two_back == 0)) {
+			dispose = 2; // if I don't have an image to revert back to, default
+						 // to the old background
+		}
+
+		if (dispose == 3) { // use previous graphic
+			for (pi = 0; pi < pcount; ++pi) {
+				if (g->history[pi]) {
+					memcpy(&g->out[pi * 4], &two_back[pi * 4], 4);
+				}
+			}
+		} else if (dispose == 2) {
+			// restore what was changed last frame to background before that
+			// frame;
+			for (pi = 0; pi < pcount; ++pi) {
+				if (g->history[pi]) {
+					memcpy(&g->out[pi * 4], &g->background[pi * 4], 4);
+				}
+			}
+		} else {
+			// This is a non-disposal case eithe way, so just
+			// leave the pixels as is, and they will become the new background
+			// 1: do not dispose
+			// 0:  not specified.
+		}
+
+		// background is what out is after the undoing of the previou frame;
+		memcpy(g->background, g->out, 4 * g->w * g->h);
+	}
+
+	// clear my history;
+	memset(g->history, 0x00,
+		   g->w * g->h); // pixels that were affected previous frame
+
+	for (;;) {
+		int tag = stbi__get8(s);
+		switch (tag) {
+		case 0x2C: /* Image Descriptor */
+		{
+			stbi__int32 x, y, w, h;
+			stbi_uc *o;
+
+			x = stbi__get16le(s);
+			y = stbi__get16le(s);
+			w = stbi__get16le(s);
+			h = stbi__get16le(s);
+			if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+				return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+
+			g->line_size = g->w * 4;
+			g->start_x = x * 4;
+			g->start_y = y * g->line_size;
+			g->max_x = g->start_x + w * 4;
+			g->max_y = g->start_y + h * g->line_size;
+			g->cur_x = g->start_x;
+			g->cur_y = g->start_y;
+
+			// if the width of the specified rectangle is 0, that means
+			// we may not see *any* pixels or the image is malformed;
+			// to make sure this is caught, move the current y down to
+			// max_y (which is what out_gif_code checks).
+			if (w == 0) g->cur_y = g->max_y;
+
+			g->lflags = stbi__get8(s);
+
+			if (g->lflags & 0x40) {
+				g->step = 8 * g->line_size; // first interlaced spacing
+				g->parse = 3;
+			} else {
+				g->step = g->line_size;
+				g->parse = 0;
+			}
+
+			if (g->lflags & 0x80) {
+				stbi__gif_parse_colortable(s, g->lpal, 2 << (g->lflags & 7),
+										   g->eflags & 0x01 ? g->transparent : -1);
+				g->color_table = (stbi_uc *)g->lpal;
+			} else if (g->flags & 0x80) {
+				g->color_table = (stbi_uc *)g->pal;
+			} else
+				return stbi__errpuc("missing color table", "Corrupt GIF");
+
+			o = stbi__process_gif_raster(s, g);
+			if (!o) return NULL;
+
+			// if this was the first frame,
+			pcount = g->w * g->h;
+			if (first_frame && (g->bgindex > 0)) {
+				// if first frame, any pixel not drawn to gets the background
+				// color
+				for (pi = 0; pi < pcount; ++pi) {
+					if (g->history[pi] == 0) {
+						g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo
+													 // that; It will be reset next frame if need
+													 // be;
+						memcpy(&g->out[pi * 4], &g->pal[g->bgindex], 4);
+					}
+				}
+			}
+
+			return o;
+		}
+
+		case 0x21: // Comment Extension.
+		{
+			int len;
+			int ext = stbi__get8(s);
+			if (ext == 0xF9) { // Graphic Control Extension.
+				len = stbi__get8(s);
+				if (len == 4) {
+					g->eflags = stbi__get8(s);
+					g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second,
+													  // saving as 1/1000ths.
+
+					// unset old transparent
+					if (g->transparent >= 0) {
+						g->pal[g->transparent][3] = 255;
+					}
+					if (g->eflags & 0x01) {
+						g->transparent = stbi__get8(s);
+						if (g->transparent >= 0) {
+							g->pal[g->transparent][3] = 0;
+						}
+					} else {
+						// don't need transparent
+						stbi__skip(s, 1);
+						g->transparent = -1;
+					}
+				} else {
+					stbi__skip(s, len);
+					break;
+				}
+			}
+			while ((len = stbi__get8(s)) != 0) {
+				stbi__skip(s, len);
+			}
+			break;
+		}
+
+		case 0x3B:				 // gif stream termination code
+			return (stbi_uc *)s; // using '1' causes warning on some compilers
+
+		default:
+			return stbi__errpuc("unknown code", "Corrupt GIF");
+		}
+	}
+}
+
+static void *stbi__load_gif_main_outofmem(stbi__gif *g, stbi_uc *out, int **delays) {
+	STBI_FREE(g->out);
+	STBI_FREE(g->history);
+	STBI_FREE(g->background);
+
+	if (out) STBI_FREE(out);
+	if (delays && *delays) STBI_FREE(*delays);
+	return stbi__errpuc("outofmem", "Out of memory");
+}
+
+static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp,
+								 int req_comp) {
+	if (stbi__gif_test(s)) {
+		int layers = 0;
+		stbi_uc *u = 0;
+		stbi_uc *out = 0;
+		stbi_uc *two_back = 0;
+		stbi__gif g;
+		int stride;
+		int out_size = 0;
+		int delays_size = 0;
+
+		STBI_NOTUSED(out_size);
+		STBI_NOTUSED(delays_size);
+
+		memset(&g, 0, sizeof(g));
+		if (delays) {
+			*delays = 0;
+		}
+
+		do {
+			u = stbi__gif_load_next(s, &g, comp, req_comp, two_back);
+			if (u == (stbi_uc *)s) u = 0; // end of animated gif marker
+
+			if (u) {
+				*x = g.w;
+				*y = g.h;
+				++layers;
+				stride = g.w * g.h * 4;
+
+				if (out) {
+					void *tmp = (stbi_uc *)STBI_REALLOC_SIZED(out, out_size, layers * stride);
+					if (!tmp)
+						return stbi__load_gif_main_outofmem(&g, out, delays);
+					else {
+						out = (stbi_uc *)tmp;
+						out_size = layers * stride;
+					}
+
+					if (delays) {
+						int *new_delays =
+							(int *)STBI_REALLOC_SIZED(*delays, delays_size, sizeof(int) * layers);
+						if (!new_delays) return stbi__load_gif_main_outofmem(&g, out, delays);
+						*delays = new_delays;
+						delays_size = layers * sizeof(int);
+					}
+				} else {
+					out = (stbi_uc *)stbi__malloc(layers * stride);
+					if (!out) return stbi__load_gif_main_outofmem(&g, out, delays);
+					out_size = layers * stride;
+					if (delays) {
+						*delays = (int *)stbi__malloc(layers * sizeof(int));
+						if (!*delays) return stbi__load_gif_main_outofmem(&g, out, delays);
+						delays_size = layers * sizeof(int);
+					}
+				}
+				memcpy(out + ((layers - 1) * stride), u, stride);
+				if (layers >= 2) {
+					two_back = out - 2 * stride;
+				}
+
+				if (delays) {
+					(*delays)[layers - 1U] = g.delay;
+				}
+			}
+		} while (u != 0);
+
+		// free temp buffer;
+		STBI_FREE(g.out);
+		STBI_FREE(g.history);
+		STBI_FREE(g.background);
+
+		// do the final conversion after loading everything;
+		if (req_comp && req_comp != 4)
+			out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h);
+
+		*z = layers;
+		return out;
+	} else {
+		return stbi__errpuc("not GIF", "Image was not as a gif type.");
+	}
+}
+
+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri) {
+	stbi_uc *u = 0;
+	stbi__gif g;
+	memset(&g, 0, sizeof(g));
+	STBI_NOTUSED(ri);
+
+	u = stbi__gif_load_next(s, &g, comp, req_comp, 0);
+	if (u == (stbi_uc *)s) u = 0; // end of animated gif marker
+	if (u) {
+		*x = g.w;
+		*y = g.h;
+
+		// moved conversion to after successful load so that the same
+		// can be done for multiple frames.
+		if (req_comp && req_comp != 4) u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
+	} else if (g.out) {
+		// if there was an error and we allocated an image buffer, free it!
+		STBI_FREE(g.out);
+	}
+
+	// free buffers needed for multiple frame loading;
+	STBI_FREE(g.history);
+	STBI_FREE(g.background);
+
+	return u;
+}
+
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) {
+	return stbi__gif_info_raw(s, x, y, comp);
+}
+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR loader
+// originally by Nicolas Schulz
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test_core(stbi__context *s, const char *signature) {
+	int i;
+	for (i = 0; signature[i]; ++i)
+		if (stbi__get8(s) != signature[i]) return 0;
+	stbi__rewind(s);
+	return 1;
+}
+
+static int stbi__hdr_test(stbi__context *s) {
+	int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
+	stbi__rewind(s);
+	if (!r) {
+		r = stbi__hdr_test_core(s, "#?RGBE\n");
+		stbi__rewind(s);
+	}
+	return r;
+}
+
+#define STBI__HDR_BUFLEN 1024
+static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) {
+	int len = 0;
+	char c = '\0';
+
+	c = (char)stbi__get8(z);
+
+	while (!stbi__at_eof(z) && c != '\n') {
+		buffer[len++] = c;
+		if (len == STBI__HDR_BUFLEN - 1) {
+			// flush to end of line
+			while (!stbi__at_eof(z) && stbi__get8(z) != '\n');
+			break;
+		}
+		c = (char)stbi__get8(z);
+	}
+
+	buffer[len] = 0;
+	return buffer;
+}
+
+static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp) {
+	if (input[3] != 0) {
+		float f1;
+		// Exponent
+		f1 = (float)ldexp(1.0f, input[3] - (int)(128 + 8));
+		if (req_comp <= 2)
+			output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+		else {
+			output[0] = input[0] * f1;
+			output[1] = input[1] * f1;
+			output[2] = input[2] * f1;
+		}
+		if (req_comp == 2) output[1] = 1;
+		if (req_comp == 4) output[3] = 1;
+	} else {
+		switch (req_comp) {
+		case 4:
+			output[3] = 1; /* fallthrough */
+		case 3:
+			output[0] = output[1] = output[2] = 0;
+			break;
+		case 2:
+			output[1] = 1; /* fallthrough */
+		case 1:
+			output[0] = 0;
+			break;
+		}
+	}
+}
+
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							 stbi__result_info *ri) {
+	char buffer[STBI__HDR_BUFLEN];
+	char *token;
+	int valid = 0;
+	int width, height;
+	stbi_uc *scanline;
+	float *hdr_data;
+	int len;
+	unsigned char count, value;
+	int i, j, k, c1, c2, z;
+	const char *headerToken;
+	STBI_NOTUSED(ri);
+
+	// Check identifier
+	headerToken = stbi__hdr_gettoken(s, buffer);
+	if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0)
+		return stbi__errpf("not HDR", "Corrupt HDR image");
+
+	// Parse header
+	for (;;) {
+		token = stbi__hdr_gettoken(s, buffer);
+		if (token[0] == 0) break;
+		if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+	}
+
+	if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format");
+
+	// Parse width and height
+	// can't use sscanf() if we're not using stdio!
+	token = stbi__hdr_gettoken(s, buffer);
+	if (strncmp(token, "-Y ", 3))
+		return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+	token += 3;
+	height = (int)strtol(token, &token, 10);
+	while (*token == ' ') ++token;
+	if (strncmp(token, "+X ", 3))
+		return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+	token += 3;
+	width = (int)strtol(token, NULL, 10);
+
+	if (height > STBI_MAX_DIMENSIONS)
+		return stbi__errpf("too large", "Very large image (corrupt?)");
+	if (width > STBI_MAX_DIMENSIONS) return stbi__errpf("too large", "Very large image (corrupt?)");
+
+	*x = width;
+	*y = height;
+
+	if (comp) *comp = 3;
+	if (req_comp == 0) req_comp = 3;
+
+	if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0))
+		return stbi__errpf("too large", "HDR image is too large");
+
+	// Read data
+	hdr_data = (float *)stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
+	if (!hdr_data) return stbi__errpf("outofmem", "Out of memory");
+
+	// Load image data
+	// image data is stored as some number of sca
+	if (width < 8 || width >= 32768) {
+		// Read flat data
+		for (j = 0; j < height; ++j) {
+			for (i = 0; i < width; ++i) {
+				stbi_uc rgbe[4];
+			main_decode_loop:
+				stbi__getn(s, rgbe, 4);
+				stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
+			}
+		}
+	} else {
+		// Read RLE-encoded data
+		scanline = NULL;
+
+		for (j = 0; j < height; ++j) {
+			c1 = stbi__get8(s);
+			c2 = stbi__get8(s);
+			len = stbi__get8(s);
+			if (c1 != 2 || c2 != 2 || (len & 0x80)) {
+				// not run-length encoded, so we have to actually use THIS data
+				// as a decoded pixel (note this can't be a valid pixel--one of
+				// RGB must be >= 128)
+				stbi_uc rgbe[4];
+				rgbe[0] = (stbi_uc)c1;
+				rgbe[1] = (stbi_uc)c2;
+				rgbe[2] = (stbi_uc)len;
+				rgbe[3] = (stbi_uc)stbi__get8(s);
+				stbi__hdr_convert(hdr_data, rgbe, req_comp);
+				i = 1;
+				j = 0;
+				STBI_FREE(scanline);
+				goto main_decode_loop; // yes, this makes no sense
+			}
+			len <<= 8;
+			len |= stbi__get8(s);
+			if (len != width) {
+				STBI_FREE(hdr_data);
+				STBI_FREE(scanline);
+				return stbi__errpf("invalid decoded scanline length", "corrupt HDR");
+			}
+			if (scanline == NULL) {
+				scanline = (stbi_uc *)stbi__malloc_mad2(width, 4, 0);
+				if (!scanline) {
+					STBI_FREE(hdr_data);
+					return stbi__errpf("outofmem", "Out of memory");
+				}
+			}
+
+			for (k = 0; k < 4; ++k) {
+				int nleft;
+				i = 0;
+				while ((nleft = width - i) > 0) {
+					count = stbi__get8(s);
+					if (count > 128) {
+						// Run
+						value = stbi__get8(s);
+						count -= 128;
+						if ((count == 0) || (count > nleft)) {
+							STBI_FREE(hdr_data);
+							STBI_FREE(scanline);
+							return stbi__errpf("corrupt", "bad RLE data in HDR");
+						}
+						for (z = 0; z < count; ++z) scanline[i++ * 4 + k] = value;
+					} else {
+						// Dump
+						if ((count == 0) || (count > nleft)) {
+							STBI_FREE(hdr_data);
+							STBI_FREE(scanline);
+							return stbi__errpf("corrupt", "bad RLE data in HDR");
+						}
+						for (z = 0; z < count; ++z) scanline[i++ * 4 + k] = stbi__get8(s);
+					}
+				}
+			}
+			for (i = 0; i < width; ++i)
+				stbi__hdr_convert(hdr_data + (j * width + i) * req_comp, scanline + i * 4,
+								  req_comp);
+		}
+		if (scanline) STBI_FREE(scanline);
+	}
+
+	return hdr_data;
+}
+
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp) {
+	char buffer[STBI__HDR_BUFLEN];
+	char *token;
+	int valid = 0;
+	int dummy;
+
+	if (!x) x = &dummy;
+	if (!y) y = &dummy;
+	if (!comp) comp = &dummy;
+
+	if (stbi__hdr_test(s) == 0) {
+		stbi__rewind(s);
+		return 0;
+	}
+
+	for (;;) {
+		token = stbi__hdr_gettoken(s, buffer);
+		if (token[0] == 0) break;
+		if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+	}
+
+	if (!valid) {
+		stbi__rewind(s);
+		return 0;
+	}
+	token = stbi__hdr_gettoken(s, buffer);
+	if (strncmp(token, "-Y ", 3)) {
+		stbi__rewind(s);
+		return 0;
+	}
+	token += 3;
+	*y = (int)strtol(token, &token, 10);
+	while (*token == ' ') ++token;
+	if (strncmp(token, "+X ", 3)) {
+		stbi__rewind(s);
+		return 0;
+	}
+	token += 3;
+	*x = (int)strtol(token, NULL, 10);
+	*comp = 3;
+	return 1;
+}
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) {
+	void *p;
+	stbi__bmp_data info;
+
+	info.all_a = 255;
+	p = stbi__bmp_parse_header(s, &info);
+	if (p == NULL) {
+		stbi__rewind(s);
+		return 0;
+	}
+	if (x) *x = s->img_x;
+	if (y) *y = s->img_y;
+	if (comp) {
+		if (info.bpp == 24 && info.ma == 0xff000000)
+			*comp = 3;
+		else
+			*comp = info.ma ? 4 : 3;
+	}
+	return 1;
+}
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) {
+	int channelCount, dummy, depth;
+	if (!x) x = &dummy;
+	if (!y) y = &dummy;
+	if (!comp) comp = &dummy;
+	if (stbi__get32be(s) != 0x38425053) {
+		stbi__rewind(s);
+		return 0;
+	}
+	if (stbi__get16be(s) != 1) {
+		stbi__rewind(s);
+		return 0;
+	}
+	stbi__skip(s, 6);
+	channelCount = stbi__get16be(s);
+	if (channelCount < 0 || channelCount > 16) {
+		stbi__rewind(s);
+		return 0;
+	}
+	*y = stbi__get32be(s);
+	*x = stbi__get32be(s);
+	depth = stbi__get16be(s);
+	if (depth != 8 && depth != 16) {
+		stbi__rewind(s);
+		return 0;
+	}
+	if (stbi__get16be(s) != 3) {
+		stbi__rewind(s);
+		return 0;
+	}
+	*comp = 4;
+	return 1;
+}
+
+static int stbi__psd_is16(stbi__context *s) {
+	int channelCount, depth;
+	if (stbi__get32be(s) != 0x38425053) {
+		stbi__rewind(s);
+		return 0;
+	}
+	if (stbi__get16be(s) != 1) {
+		stbi__rewind(s);
+		return 0;
+	}
+	stbi__skip(s, 6);
+	channelCount = stbi__get16be(s);
+	if (channelCount < 0 || channelCount > 16) {
+		stbi__rewind(s);
+		return 0;
+	}
+	STBI_NOTUSED(stbi__get32be(s));
+	STBI_NOTUSED(stbi__get32be(s));
+	depth = stbi__get16be(s);
+	if (depth != 16) {
+		stbi__rewind(s);
+		return 0;
+	}
+	return 1;
+}
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) {
+	int act_comp = 0, num_packets = 0, chained, dummy;
+	stbi__pic_packet packets[10];
+
+	if (!x) x = &dummy;
+	if (!y) y = &dummy;
+	if (!comp) comp = &dummy;
+
+	if (!stbi__pic_is4(s, "\x53\x80\xF6\x34")) {
+		stbi__rewind(s);
+		return 0;
+	}
+
+	stbi__skip(s, 88);
+
+	*x = stbi__get16be(s);
+	*y = stbi__get16be(s);
+	if (stbi__at_eof(s)) {
+		stbi__rewind(s);
+		return 0;
+	}
+	if ((*x) != 0 && (1 << 28) / (*x) < (*y)) {
+		stbi__rewind(s);
+		return 0;
+	}
+
+	stbi__skip(s, 8);
+
+	do {
+		stbi__pic_packet *packet;
+
+		if (num_packets == sizeof(packets) / sizeof(packets[0])) return 0;
+
+		packet = &packets[num_packets++];
+		chained = stbi__get8(s);
+		packet->size = stbi__get8(s);
+		packet->type = stbi__get8(s);
+		packet->channel = stbi__get8(s);
+		act_comp |= packet->channel;
+
+		if (stbi__at_eof(s)) {
+			stbi__rewind(s);
+			return 0;
+		}
+		if (packet->size != 8) {
+			stbi__rewind(s);
+			return 0;
+		}
+	} while (chained);
+
+	*comp = (act_comp & 0x10 ? 4 : 3);
+
+	return 1;
+}
+#endif
+
+// *************************************************************************************************
+// Portable Gray Map and Portable Pixel Map loader
+// by Ken Miller
+//
+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
+//
+// Known limitations:
+//    Does not support comments in the header section
+//    Does not support ASCII image data (formats P2 and P3)
+
+#ifndef STBI_NO_PNM
+
+static int stbi__pnm_test(stbi__context *s) {
+	char p, t;
+	p = (char)stbi__get8(s);
+	t = (char)stbi__get8(s);
+	if (p != 'P' || (t != '5' && t != '6')) {
+		stbi__rewind(s);
+		return 0;
+	}
+	return 1;
+}
+
+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp,
+							stbi__result_info *ri) {
+	stbi_uc *out;
+	STBI_NOTUSED(ri);
+
+	ri->bits_per_channel = stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n);
+	if (ri->bits_per_channel == 0) return 0;
+
+	if (s->img_y > STBI_MAX_DIMENSIONS)
+		return stbi__errpuc("too large", "Very large image (corrupt?)");
+	if (s->img_x > STBI_MAX_DIMENSIONS)
+		return stbi__errpuc("too large", "Very large image (corrupt?)");
+
+	*x = s->img_x;
+	*y = s->img_y;
+	if (comp) *comp = s->img_n;
+
+	if (!stbi__mad4sizes_valid(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0))
+		return stbi__errpuc("too large", "PNM too large");
+
+	out = (stbi_uc *)stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0);
+	if (!out) return stbi__errpuc("outofmem", "Out of memory");
+	if (!stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8))) {
+		STBI_FREE(out);
+		return stbi__errpuc("bad PNM", "PNM file truncated");
+	}
+
+	if (req_comp && req_comp != s->img_n) {
+		if (ri->bits_per_channel == 16) {
+			out = (stbi_uc *)stbi__convert_format16((stbi__uint16 *)out, s->img_n, req_comp,
+													s->img_x, s->img_y);
+		} else {
+			out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+		}
+		if (out == NULL) return out; // stbi__convert_format frees input on failure
+	}
+	return out;
+}
+
+static int stbi__pnm_isspace(char c) {
+	return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+}
+
+static void stbi__pnm_skip_whitespace(stbi__context *s, char *c) {
+	for (;;) {
+		while (!stbi__at_eof(s) && stbi__pnm_isspace(*c)) *c = (char)stbi__get8(s);
+
+		if (stbi__at_eof(s) || *c != '#') break;
+
+		while (!stbi__at_eof(s) && *c != '\n' && *c != '\r') *c = (char)stbi__get8(s);
+	}
+}
+
+static int stbi__pnm_isdigit(char c) { return c >= '0' && c <= '9'; }
+
+static int stbi__pnm_getinteger(stbi__context *s, char *c) {
+	int value = 0;
+
+	while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
+		value = value * 10 + (*c - '0');
+		*c = (char)stbi__get8(s);
+		if ((value > 214748364) || (value == 214748364 && *c > '7'))
+			return stbi__err("integer parse overflow",
+							 "Parsing an integer in the PPM header overflowed a 32-bit int");
+	}
+
+	return value;
+}
+
+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) {
+	int maxv, dummy;
+	char c, p, t;
+
+	if (!x) x = &dummy;
+	if (!y) y = &dummy;
+	if (!comp) comp = &dummy;
+
+	stbi__rewind(s);
+
+	// Get identifier
+	p = (char)stbi__get8(s);
+	t = (char)stbi__get8(s);
+	if (p != 'P' || (t != '5' && t != '6')) {
+		stbi__rewind(s);
+		return 0;
+	}
+
+	*comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm
+
+	c = (char)stbi__get8(s);
+	stbi__pnm_skip_whitespace(s, &c);
+
+	*x = stbi__pnm_getinteger(s, &c); // read width
+	if (*x == 0)
+		return stbi__err("invalid width", "PPM image header had zero or overflowing width");
+	stbi__pnm_skip_whitespace(s, &c);
+
+	*y = stbi__pnm_getinteger(s, &c); // read height
+	if (*y == 0)
+		return stbi__err("invalid width", "PPM image header had zero or overflowing width");
+	stbi__pnm_skip_whitespace(s, &c);
+
+	maxv = stbi__pnm_getinteger(s, &c); // read max value
+	if (maxv > 65535)
+		return stbi__err("max value > 65535", "PPM image supports only 8-bit and 16-bit images");
+	else if (maxv > 255)
+		return 16;
+	else
+		return 8;
+}
+
+static int stbi__pnm_is16(stbi__context *s) {
+	if (stbi__pnm_info(s, NULL, NULL, NULL) == 16) return 1;
+	return 0;
+}
+#endif
+
+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) {
+#ifndef STBI_NO_JPEG
+	if (stbi__jpeg_info(s, x, y, comp)) return 1;
+#endif
+
+#ifndef STBI_NO_PNG
+	if (stbi__png_info(s, x, y, comp)) return 1;
+#endif
+
+#ifndef STBI_NO_GIF
+	if (stbi__gif_info(s, x, y, comp)) return 1;
+#endif
+
+#ifndef STBI_NO_BMP
+	if (stbi__bmp_info(s, x, y, comp)) return 1;
+#endif
+
+#ifndef STBI_NO_PSD
+	if (stbi__psd_info(s, x, y, comp)) return 1;
+#endif
+
+#ifndef STBI_NO_PIC
+	if (stbi__pic_info(s, x, y, comp)) return 1;
+#endif
+
+#ifndef STBI_NO_PNM
+	if (stbi__pnm_info(s, x, y, comp)) return 1;
+#endif
+
+#ifndef STBI_NO_HDR
+	if (stbi__hdr_info(s, x, y, comp)) return 1;
+#endif
+
+// test tga last because it's a crappy test!
+#ifndef STBI_NO_TGA
+	if (stbi__tga_info(s, x, y, comp)) return 1;
+#endif
+	return stbi__err("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static int stbi__is_16_main(stbi__context *s) {
+#ifndef STBI_NO_PNG
+	if (stbi__png_is16(s)) return 1;
+#endif
+
+#ifndef STBI_NO_PSD
+	if (stbi__psd_is16(s)) return 1;
+#endif
+
+#ifndef STBI_NO_PNM
+	if (stbi__pnm_is16(s)) return 1;
+#endif
+	return 0;
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) {
+	FILE *f = stbi__fopen(filename, "rb");
+	int result;
+	if (!f) return stbi__err("can't fopen", "Unable to open file");
+	result = stbi_info_from_file(f, x, y, comp);
+	fclose(f);
+	return result;
+}
+
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) {
+	int r;
+	stbi__context s;
+	long pos = ftell(f);
+	stbi__start_file(&s, f);
+	r = stbi__info_main(&s, x, y, comp);
+	fseek(f, pos, SEEK_SET);
+	return r;
+}
+
+STBIDEF int stbi_is_16_bit(char const *filename) {
+	FILE *f = stbi__fopen(filename, "rb");
+	int result;
+	if (!f) return stbi__err("can't fopen", "Unable to open file");
+	result = stbi_is_16_bit_from_file(f);
+	fclose(f);
+	return result;
+}
+
+STBIDEF int stbi_is_16_bit_from_file(FILE *f) {
+	int r;
+	stbi__context s;
+	long pos = ftell(f);
+	stbi__start_file(&s, f);
+	r = stbi__is_16_main(&s);
+	fseek(f, pos, SEEK_SET);
+	return r;
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) {
+	stbi__context s;
+	stbi__start_mem(&s, buffer, len);
+	return stbi__info_main(&s, x, y, comp);
+}
+
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y,
+									 int *comp) {
+	stbi__context s;
+	stbi__start_callbacks(&s, (stbi_io_callbacks *)c, user);
+	return stbi__info_main(&s, x, y, comp);
+}
+
+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len) {
+	stbi__context s;
+	stbi__start_mem(&s, buffer, len);
+	return stbi__is_16_main(&s);
+}
+
+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user) {
+	stbi__context s;
+	stbi__start_callbacks(&s, (stbi_io_callbacks *)c, user);
+	return stbi__is_16_main(&s);
+}
+
+#endif // STB_IMAGE_IMPLEMENTATION
+
+/*
+   revision history:
+	  2.20  (2019-02-07) support utf8 filenames in Windows; fix warnings and
+   platform ifdefs 2.19  (2018-02-11) fix warning 2.18  (2018-01-30) fix
+   warnings 2.17  (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug
+						 1-bit BMP
+						 *_is_16_bit api
+						 avoid warnings
+	  2.16  (2017-07-23) all functions have 16-bit variants;
+						 STBI_NO_STDIO works again;
+						 compilation fixes;
+						 fix rounding in unpremultiply;
+						 optimize vertical flip;
+						 disable raw_len validation;
+						 documentation fixes
+	  2.15  (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode;
+						 warning fixes; disable run-time SSE detection on gcc;
+						 uniform handling of optional "return" values;
+						 thread-safe initialization of zlib tables
+	  2.14  (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet
+   JPGs 2.13  (2016-11-29) add 16-bit API, only supported for PNG right now 2.12
+   (2016-04-02) fix typo in 2.11 PSD fix that caused crashes 2.11  (2016-04-02)
+   allocate large structures on the stack remove white matting for transparent
+   PSD fix reported channel count for PNG & BMP re-enable SSE2 in non-gcc 64-bit
+						 support RGB-formatted JPEG
+						 read 16-bit PNGs (only as 8-bit)
+	  2.10  (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
+	  2.09  (2016-01-16) allow comments in PNM files
+						 16-bit-per-pixel TGA (not bit-per-component)
+						 info() for TGA could break due to .hdr handling
+						 info() for BMP to shares code instead of sloppy parse
+						 can use STBI_REALLOC_SIZED if allocator doesn't support
+   realloc code cleanup 2.08  (2015-09-13) fix to 2.07 cleanup, reading RGB PSD
+   as RGBA 2.07  (2015-09-13) fix compiler warnings partial animated GIF support
+						 limited 16-bpc PSD support
+						 #ifdef unused functions
+						 bug with < 92 byte PIC,PNM,HDR,TGA
+	  2.06  (2015-04-19) fix bug where PSD returns wrong '*comp' value
+	  2.05  (2015-04-19) fix bug in progressive JPEG handling, fix warning
+	  2.04  (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+	  2.03  (2015-04-12) extra corruption checking (mmozeiko)
+						 stbi_set_flip_vertically_on_load (nguillemot)
+						 fix NEON support; fix mingw support
+	  2.02  (2015-01-19) fix incorrect assert, fix warning
+	  2.01  (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit
+   without -msse2 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG 2.00
+   (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) progressive
+   JPEG (stb) PGM/PPM support (Ken Miller) STBI_MALLOC,STBI_REALLOC,STBI_FREE
+						 GIF bugfix -- seemingly never worked
+						 STBI_NO_*, STBI_ONLY_*
+	  1.48  (2014-12-14) fix incorrectly-named assert()
+	  1.47  (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar
+   Cornut & stb) optimize PNG (ryg) fix bug in interlaced PNG with
+   user-specified channel count (stb) 1.46  (2014-08-26) fix broken tRNS chunk
+   (colorkey-style transparency) in non-paletted PNG 1.45  (2014-08-16) fix
+   MSVC-ARM internal compiler error by wrapping malloc 1.44  (2014-08-07)
+			  various warning fixes from Ronny Chevalier
+	  1.43  (2014-07-15)
+			  fix MSVC-only compiler problem in code changed in 1.42
+	  1.42  (2014-07-09)
+			  don't define _CRT_SECURE_NO_WARNINGS (affects user code)
+			  fixes to stbi__cleanup_jpeg path
+			  added STBI_ASSERT to avoid requiring assert.h
+	  1.41  (2014-06-25)
+			  fix search&replace from 1.36 that messed up comments/error
+   messages 1.40  (2014-06-22) fix gcc struct-initialization warning 1.39
+   (2014-06-15) fix to TGA optimization when req_comp != number of components in
+   TGA; fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my
+   test suite) add support for BMP version 5 (more ignored fields) 1.38
+   (2014-06-06) suppress MSVC warnings on integer casts truncating values fix
+   accidental rename of 'skip' field of I/O 1.37  (2014-06-04) remove duplicate
+   typedef 1.36  (2014-06-03) convert to header file single-file library if
+   de-iphone isn't set, load iphone images color-swapped instead of returning
+   NULL 1.35  (2014-05-27) various warnings fix broken STBI_SIMD path fix bug
+   where stbi_load_from_file no longer left file pointer in correct place fix
+   broken non-easy path for 32-bit BMP (possibly never used) TGA optimization by
+   Arseny Kapoulkine 1.34  (unknown) use STBI_NOTUSED in
+   stbi__resample_row_generic(), fix one more leak in tga failure case 1.33
+   (2011-07-14) make stbi_is_hdr work in STBI_NO_HDR (as specified), minor
+   compiler-friendly improvements 1.32  (2011-07-13) support for "info" function
+   for all supported filetypes (SpartanJ) 1.31  (2011-06-20) a few more leak
+   fixes, bug in PNG handling (SpartanJ) 1.30  (2011-06-11) added ability to
+   load files via callbacks to accomidate custom input streams (Ben Wenger)
+			  removed deprecated format-specific test/load functions
+			  removed support for installable file formats (stbi_loader) --
+   would have been broken for IO callbacks anyway error cases in bmp and tga
+   give messages and don't leak (Raymond Barbiero, grisha) fix inefficiency in
+   decoding 32-bit BMP (David Woo) 1.29  (2010-08-16) various warning fixes from
+   Aurelien Pocheville 1.28  (2010-08-01) fix bug in GIF palette transparency
+   (SpartanJ) 1.27  (2010-08-01) cast-to-stbi_uc to fix warnings 1.26
+   (2010-07-24) fix bug in file buffering for PNG reported by SpartanJ 1.25
+   (2010-07-17) refix trans_data warning (Won Chun) 1.24  (2010-07-12) perf
+   improvements reading from files on platforms with lock-heavy fgetc() minor
+   perf improvements for jpeg deprecated type-specific functions so we'll get
+   feedback if they're needed attempt to fix trans_data warning (Won Chun) 1.23
+   fixed bug in iPhone support 1.22  (2010-07-10) removed image *writing*
+   support stbi_info support from Jetro Lauha GIF support from Jean-Marc Lienher
+			  iPhone PNG-extensions from James Brown
+			  warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err.
+   Janez (U+017D)emva) 1.21    fix use of 'stbi_uc' in header (reported by jon
+   blow) 1.20    added support for Softimage PIC, by Tom Seddon 1.19    bug in
+   interlaced PNG corruption check (found by ryg) 1.18  (2008-08-02) fix a
+   threading bug (local mutable static) 1.17    support interlaced PNG 1.16
+   major bugfix - stbi__convert_format converted one too many pixels 1.15
+   initialize some fields for thread safety 1.14    fix threadsafe conversion
+   bug header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+	  1.13    threadsafe
+	  1.12    const qualifiers in the API
+	  1.11    Support installable IDCT, colorspace conversion routines
+	  1.10    Fixes for 64-bit (don't use "unsigned long")
+			  optimized upsampling by Fabian "ryg" Giesen
+	  1.09    Fix format-conversion for PSD code (bad global variables!)
+	  1.08    Thatcher Ulrich's PSD code integrated by Nicolas Schulz
+	  1.07    attempt to fix C++ warning/errors again
+	  1.06    attempt to fix C++ warning/errors again
+	  1.05    fix TGA loading to return correct *comp and use good luminance
+   calc 1.04    default float alpha is 1, not 255; use 'void *' for
+   stbi_image_free 1.03    bugfixes to STBI_NO_STDIO, STBI_NO_HDR 1.02 support
+   for (subset of) HDR files, float interface for preferred access to them 1.01
+   fix bug: possible bug in handling right-side up bmps... not sure fix bug: the
+   stbi__bmp_load() and stbi__tga_load() functions didn't work at all 1.00
+   interface to zlib that skips zlib header 0.99    correct handling of alpha in
+   palette 0.98    TGA loader by lonesock; dynamically add loaders (untested)
+	  0.97    jpeg errors on too large a file; also catch another malloc failure
+	  0.96    fix detection of invalid v value - particleman@mollyrocket forum
+	  0.95    during header scan, seek to markers in case of padding
+	  0.94    STBI_NO_STDIO to disable stdio usage; rename all #defines the same
+	  0.93    handle jpegtran output; verbose errors
+	  0.92    read 4,8,16,24,32-bit BMP files of several formats
+	  0.91    output 24-bit Windows 3.0 BMP files
+	  0.90    fix a few more warnings; bump version number to approach 1.0
+	  0.61    bugfixes due to Marc LeBlanc, Christopher Lloyd
+	  0.60    fix compiling as c++
+	  0.59    fix warnings: merge Dave Moore's -Wall fixes
+	  0.58    fix bug: zlib uncompressed mode len/nlen was wrong endian
+	  0.57    fix bug: jpg last huffman symbol before marker was >9 bits but
+   less than 16 available 0.56    fix bug: zlib uncompressed mode len vs. nlen
+	  0.55    fix bug: restart_interval not initialized to 0
+	  0.54    allow NULL for 'int *comp'
+	  0.53    fix bug in png 3->4; speedup png decoding
+	  0.52    png handles req_comp=3,4 directly; minor cleanup; jpeg comments
+	  0.51    obey req_comp requests, 1-component jpegs return as 1-component,
+			  on 'test' only check type, not whether we support this variant
+	  0.50  (2006-11-19)
+			  first released version
+*/
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/
diff --git a/third_party/stb/stb_image_write.h b/third_party/stb/stb_image_write.h
new file mode 100644
index 0000000..6a96386
--- /dev/null
+++ b/third_party/stb/stb_image_write.h
@@ -0,0 +1,2050 @@
+/* stb_image_write - v1.16 - public domain - http://nothings.org/stb
+   writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015
+                                                                         no
+warranty implied; use at your own risk
+
+   Before #including,
+
+           #define STB_IMAGE_WRITE_IMPLEMENTATION
+
+   in the file that you want to have the implementation.
+
+   Will probably not work correctly with strict-aliasing optimizations.
+
+ABOUT:
+
+   This header file is a library for writing images to C stdio or a callback.
+
+   The PNG output is not optimal; it is 20-50% larger than the file
+   written by a decent optimizing implementation; though providing a custom
+   zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that.
+   This library is designed for source code compactness and simplicity,
+   not optimal image file size or run-time performance.
+
+BUILDING:
+
+   You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h.
+   You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace
+   malloc,realloc,free.
+   You can #define STBIW_MEMMOVE() to replace memmove()
+   You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress
+function for PNG compression (instead of the builtin one), it must have the
+following signature: unsigned char * my_compress(unsigned char *data, int
+data_len, int *out_len, int quality); The returned data will be freed with
+STBIW_FREE() (free() by default), so it must be heap allocated with
+STBIW_MALLOC() (malloc() by default),
+
+UNICODE:
+
+   If compiling for Windows and you wish to use Unicode filenames, compile
+   with
+           #define STBIW_WINDOWS_UTF8
+   and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert
+   Windows wchar_t filenames to utf8.
+
+USAGE:
+
+   There are five functions, one for each image file format:
+
+         int stbi_write_png(char const *filename, int w, int h, int comp, const
+void *data, int stride_in_bytes); int stbi_write_bmp(char const *filename, int
+w, int h, int comp, const void *data); int stbi_write_tga(char const *filename,
+int w, int h, int comp, const void *data); int stbi_write_jpg(char const
+*filename, int w, int h, int comp, const void *data, int quality); int
+stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
+
+         void stbi_flip_vertically_on_write(int flag); // flag is non-zero to
+flip data vertically
+
+   There are also five equivalent functions that use an arbitrary write
+function. You are expected to open/close your file-equivalent before and after
+calling these:
+
+         int stbi_write_png_to_func(stbi_write_func *func, void *context, int w,
+int h, int comp, const void  *data, int stride_in_bytes); int
+stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int
+comp, const void  *data); int stbi_write_tga_to_func(stbi_write_func *func, void
+*context, int w, int h, int comp, const void  *data); int
+stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int
+comp, const float *data); int stbi_write_jpg_to_func(stbi_write_func *func, void
+*context, int x, int y, int comp, const void *data, int quality);
+
+   where the callback is:
+          void stbi_write_func(void *context, void *data, int size);
+
+   You can configure it with these global variables:
+          int stbi_write_tga_with_rle;             // defaults to true; set to 0
+to disable RLE int stbi_write_png_compression_level;    // defaults to 8; set to
+higher for more compression int stbi_write_force_png_filter;         // defaults
+to -1; set to 0..5 to force a filter mode
+
+
+   You can define STBI_WRITE_NO_STDIO to disable the file variant of these
+   functions, so the library will not use stdio.h at all. However, this will
+   also disable HDR writing, because it requires stdio for formatted output.
+
+   Each function returns 0 on failure and non-0 on success.
+
+   The functions create an image file defined by the parameters. The image
+   is a rectangle of pixels stored from left-to-right, top-to-bottom.
+   Each pixel contains 'comp' channels of data stored interleaved with 8-bits
+   per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is
+   monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall.
+   The *data pointer points to the first byte of the top-left-most pixel.
+   For PNG, "stride_in_bytes" is the distance in bytes from the first byte of
+   a row of pixels to the first byte of the next row of pixels.
+
+   PNG creates output files with the same number of components as the input.
+   The BMP format expands Y to RGB in the file format and does not
+   output alpha.
+
+   PNG supports writing rectangles of data even when the bytes storing rows of
+   data are not consecutive in memory (e.g. sub-rectangles of a larger image),
+   by supplying the stride between the beginning of adjacent rows. The other
+   formats do not. (Thus you cannot write a native-format BMP through the BMP
+   writer, both because it is in BGR order and because it may have padding
+   at the end of the line.)
+
+   PNG allows you to set the deflate compression level by setting the global
+   variable 'stbi_write_png_compression_level' (it defaults to 8).
+
+   HDR expects linear float data. Since the format is always 32-bit rgb(e)
+   data, alpha (if provided) is discarded, and for monochrome data it is
+   replicated across all three channels.
+
+   TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed
+   data, set the global variable 'stbi_write_tga_with_rle' to 0.
+
+   JPEG does ignore alpha channels in input data; quality is between 1 and 100.
+   Higher quality looks better but results in a bigger image.
+   JPEG baseline (no JPEG progressive).
+
+CREDITS:
+
+
+   Sean Barrett           -    PNG/BMP/TGA
+   Baldur Karlsson        -    HDR
+   Jean-Sebastien Guay    -    TGA monochrome
+   Tim Kelsey             -    misc enhancements
+   Alan Hickman           -    TGA RLE
+   Emmanuel Julien        -    initial file IO callback implementation
+   Jon Olick              -    original jo_jpeg.cpp code
+   Daniel Gibson          -    integrate JPEG, allow external zlib
+   Aarni Koskela          -    allow choosing PNG filter
+
+   bugfixes:
+          github:Chribba
+          Guillaume Chereau
+          github:jry2
+          github:romigrou
+          Sergio Gonzalez
+          Jonas Karlsson
+          Filip Wasil
+          Thatcher Ulrich
+          github:poppolopoppo
+          Patrick Boettcher
+          github:xeekworx
+          Cap Petschulat
+          Simon Rodriguez
+          Ivan Tikhonov
+          github:ignotion
+          Adam Schackart
+          Andrew Kensler
+
+LICENSE
+
+  See end of file for license information.
+
+*/
+
+#ifndef INCLUDE_STB_IMAGE_WRITE_H
+#define INCLUDE_STB_IMAGE_WRITE_H
+
+#include <stdlib.h>
+
+// if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline'
+// or 'static inline'
+#ifndef STBIWDEF
+#ifdef STB_IMAGE_WRITE_STATIC
+#define STBIWDEF static
+#else
+#ifdef __cplusplus
+#define STBIWDEF extern "C"
+#else
+#define STBIWDEF extern
+#endif
+#endif
+#endif
+
+#ifndef STB_IMAGE_WRITE_STATIC // C++ forbids static forward declarations
+STBIWDEF int stbi_write_tga_with_rle;
+STBIWDEF int stbi_write_png_compression_level;
+STBIWDEF int stbi_write_force_png_filter;
+#endif
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp,
+                            const void *data, int stride_in_bytes);
+STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp,
+                            const void *data);
+STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp,
+                            const void *data);
+STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp,
+                            const float *data);
+STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp,
+                            const void *data, int quality);
+
+#ifdef STBIW_WINDOWS_UTF8
+STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen,
+                                         const wchar_t *input);
+#endif
+#endif
+
+typedef void stbi_write_func(void *context, void *data, int size);
+
+STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w,
+                                    int h, int comp, const void *data,
+                                    int stride_in_bytes);
+STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w,
+                                    int h, int comp, const void *data);
+STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w,
+                                    int h, int comp, const void *data);
+STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w,
+                                    int h, int comp, const float *data);
+STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x,
+                                    int y, int comp, const void *data,
+                                    int quality);
+
+STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
+
+#endif // INCLUDE_STB_IMAGE_WRITE_H
+
+#ifdef STB_IMAGE_WRITE_IMPLEMENTATION
+
+#ifdef _WIN32
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+#ifndef _CRT_NONSTDC_NO_DEPRECATE
+#define _CRT_NONSTDC_NO_DEPRECATE
+#endif
+#endif
+
+#ifndef STBI_WRITE_NO_STDIO
+#include <stdio.h>
+#endif // STBI_WRITE_NO_STDIO
+
+#include <math.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(STBIW_MALLOC) && defined(STBIW_FREE) &&                            \
+    (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED))
+// ok
+#elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) &&                        \
+    !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED)
+// ok
+#else
+#error                                                                         \
+    "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)."
+#endif
+
+#ifndef STBIW_MALLOC
+#define STBIW_MALLOC(sz) malloc(sz)
+#define STBIW_REALLOC(p, newsz) realloc(p, newsz)
+#define STBIW_FREE(p) free(p)
+#endif
+
+#ifndef STBIW_REALLOC_SIZED
+#define STBIW_REALLOC_SIZED(p, oldsz, newsz) STBIW_REALLOC(p, newsz)
+#endif
+
+#ifndef STBIW_MEMMOVE
+#define STBIW_MEMMOVE(a, b, sz) memmove(a, b, sz)
+#endif
+
+#ifndef STBIW_ASSERT
+#include <assert.h>
+#define STBIW_ASSERT(x) assert(x)
+#endif
+
+#define STBIW_UCHAR(x) (unsigned char)((x) & 0xff)
+
+#ifdef STB_IMAGE_WRITE_STATIC
+static int stbi_write_png_compression_level = 8;
+static int stbi_write_tga_with_rle = 1;
+static int stbi_write_force_png_filter = -1;
+#else
+int stbi_write_png_compression_level = 8;
+int stbi_write_tga_with_rle = 1;
+int stbi_write_force_png_filter = -1;
+#endif
+
+static int stbi__flip_vertically_on_write = 0;
+
+STBIWDEF void stbi_flip_vertically_on_write(int flag) {
+  stbi__flip_vertically_on_write = flag;
+}
+
+typedef struct {
+  stbi_write_func *func;
+  void *context;
+  unsigned char buffer[64];
+  int buf_used;
+} stbi__write_context;
+
+// initialize a callback-based context
+static void stbi__start_write_callbacks(stbi__write_context *s,
+                                        stbi_write_func *c, void *context) {
+  s->func = c;
+  s->context = context;
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+
+static void stbi__stdio_write(void *context, void *data, int size) {
+  fwrite(data, 1, size, (FILE *)context);
+}
+
+#if defined(_WIN32) && defined(STBIW_WINDOWS_UTF8)
+#ifdef __cplusplus
+#define STBIW_EXTERN extern "C"
+#else
+#define STBIW_EXTERN extern
+#endif
+STBIW_EXTERN
+__declspec(dllimport) int __stdcall MultiByteToWideChar(
+    unsigned int cp, unsigned long flags, const char *str, int cbmb,
+    wchar_t *widestr, int cchwide);
+STBIW_EXTERN
+__declspec(dllimport) int __stdcall WideCharToMultiByte(
+    unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide,
+    char *str, int cbmb, const char *defchar, int *used_default);
+
+STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen,
+                                         const wchar_t *input) {
+  return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer,
+                             (int)bufferlen, NULL, NULL);
+}
+#endif
+
+static FILE *stbiw__fopen(char const *filename, char const *mode) {
+  FILE *f;
+#if defined(_WIN32) && defined(STBIW_WINDOWS_UTF8)
+  wchar_t wMode[64];
+  wchar_t wFilename[1024];
+  if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename,
+                               sizeof(wFilename) / sizeof(*wFilename)))
+    return 0;
+
+  if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode,
+                               sizeof(wMode) / sizeof(*wMode)))
+    return 0;
+
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+  if (0 != _wfopen_s(&f, wFilename, wMode))
+    f = 0;
+#else
+  f = _wfopen(wFilename, wMode);
+#endif
+
+#elif defined(_MSC_VER) && _MSC_VER >= 1400
+  if (0 != fopen_s(&f, filename, mode))
+    f = 0;
+#else
+  f = fopen(filename, mode);
+#endif
+  return f;
+}
+
+static int stbi__start_write_file(stbi__write_context *s,
+                                  const char *filename) {
+  FILE *f = stbiw__fopen(filename, "wb");
+  stbi__start_write_callbacks(s, stbi__stdio_write, (void *)f);
+  return f != NULL;
+}
+
+static void stbi__end_write_file(stbi__write_context *s) {
+  fclose((FILE *)s->context);
+}
+
+#endif // !STBI_WRITE_NO_STDIO
+
+typedef unsigned int stbiw_uint32;
+typedef int stb_image_write_test[sizeof(stbiw_uint32) == 4 ? 1 : -1];
+
+static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v) {
+  while (*fmt) {
+    switch (*fmt++) {
+    case ' ':
+      break;
+    case '1': {
+      unsigned char x = STBIW_UCHAR(va_arg(v, int));
+      s->func(s->context, &x, 1);
+      break;
+    }
+    case '2': {
+      int x = va_arg(v, int);
+      unsigned char b[2];
+      b[0] = STBIW_UCHAR(x);
+      b[1] = STBIW_UCHAR(x >> 8);
+      s->func(s->context, b, 2);
+      break;
+    }
+    case '4': {
+      stbiw_uint32 x = va_arg(v, int);
+      unsigned char b[4];
+      b[0] = STBIW_UCHAR(x);
+      b[1] = STBIW_UCHAR(x >> 8);
+      b[2] = STBIW_UCHAR(x >> 16);
+      b[3] = STBIW_UCHAR(x >> 24);
+      s->func(s->context, b, 4);
+      break;
+    }
+    default:
+      STBIW_ASSERT(0);
+      return;
+    }
+  }
+}
+
+static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) {
+  va_list v;
+  va_start(v, fmt);
+  stbiw__writefv(s, fmt, v);
+  va_end(v);
+}
+
+static void stbiw__write_flush(stbi__write_context *s) {
+  if (s->buf_used) {
+    s->func(s->context, &s->buffer, s->buf_used);
+    s->buf_used = 0;
+  }
+}
+
+static void stbiw__putc(stbi__write_context *s, unsigned char c) {
+  s->func(s->context, &c, 1);
+}
+
+static void stbiw__write1(stbi__write_context *s, unsigned char a) {
+  if ((size_t)s->buf_used + 1 > sizeof(s->buffer))
+    stbiw__write_flush(s);
+  s->buffer[s->buf_used++] = a;
+}
+
+static void stbiw__write3(stbi__write_context *s, unsigned char a,
+                          unsigned char b, unsigned char c) {
+  int n;
+  if ((size_t)s->buf_used + 3 > sizeof(s->buffer))
+    stbiw__write_flush(s);
+  n = s->buf_used;
+  s->buf_used = n + 3;
+  s->buffer[n + 0] = a;
+  s->buffer[n + 1] = b;
+  s->buffer[n + 2] = c;
+}
+
+static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp,
+                               int write_alpha, int expand_mono,
+                               unsigned char *d) {
+  unsigned char bg[3] = {255, 0, 255}, px[3];
+  int k;
+
+  if (write_alpha < 0)
+    stbiw__write1(s, d[comp - 1]);
+
+  switch (comp) {
+  case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as
+          // 1-channel case
+  case 1:
+    if (expand_mono)
+      stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp
+    else
+      stbiw__write1(s, d[0]); // monochrome TGA
+    break;
+  case 4:
+    if (!write_alpha) {
+      // composite against pink background
+      for (k = 0; k < 3; ++k)
+        px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255;
+      stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]);
+      break;
+    }
+    /* FALLTHROUGH */
+  case 3:
+    stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]);
+    break;
+  }
+  if (write_alpha > 0)
+    stbiw__write1(s, d[comp - 1]);
+}
+
+static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir,
+                                int x, int y, int comp, void *data,
+                                int write_alpha, int scanline_pad,
+                                int expand_mono) {
+  stbiw_uint32 zero = 0;
+  int i, j, j_end;
+
+  if (y <= 0)
+    return;
+
+  if (stbi__flip_vertically_on_write)
+    vdir *= -1;
+
+  if (vdir < 0) {
+    j_end = -1;
+    j = y - 1;
+  } else {
+    j_end = y;
+    j = 0;
+  }
+
+  for (; j != j_end; j += vdir) {
+    for (i = 0; i < x; ++i) {
+      unsigned char *d = (unsigned char *)data + (j * x + i) * comp;
+      stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d);
+    }
+    stbiw__write_flush(s);
+    s->func(s->context, &zero, scanline_pad);
+  }
+}
+
+static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x,
+                          int y, int comp, int expand_mono, void *data,
+                          int alpha, int pad, const char *fmt, ...) {
+  if (y < 0 || x < 0) {
+    return 0;
+  } else {
+    va_list v;
+    va_start(v, fmt);
+    stbiw__writefv(s, fmt, v);
+    va_end(v);
+    stbiw__write_pixels(s, rgb_dir, vdir, x, y, comp, data, alpha, pad,
+                        expand_mono);
+    return 1;
+  }
+}
+
+static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp,
+                               const void *data) {
+  if (comp != 4) {
+    // write RGB bitmap
+    int pad = (-x * 3) & 3;
+    return stbiw__outfile(s, -1, -1, x, y, comp, 1, (void *)data, 0, pad,
+                          "11 4 22 4"
+                          "4 44 22 444444",
+                          'B', 'M', 14 + 40 + (x * 3 + pad) * y, 0, 0,
+                          14 + 40,                            // file header
+                          40, x, y, 1, 24, 0, 0, 0, 0, 0, 0); // bitmap header
+  } else {
+    // RGBA bitmaps need a v4 header
+    // use BI_BITFIELDS mode with 32bpp and alpha mask
+    // (straight BI_RGB with alpha mask doesn't work in most readers)
+    return stbiw__outfile(s, -1, -1, x, y, comp, 1, (void *)data, 1, 0,
+                          "11 4 22 4"
+                          "4 44 22 444444 4444 4 444 444 444 444",
+                          'B', 'M', 14 + 108 + x * y * 4, 0, 0,
+                          14 + 108, // file header
+                          108, x, y, 1, 32, 3, 0, 0, 0, 0, 0, 0xff0000, 0xff00,
+                          0xff, 0xff000000u, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                          0); // bitmap V4 header
+  }
+}
+
+STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x,
+                                    int y, int comp, const void *data) {
+  stbi__write_context s = {0};
+  stbi__start_write_callbacks(&s, func, context);
+  return stbi_write_bmp_core(&s, x, y, comp, data);
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp,
+                            const void *data) {
+  stbi__write_context s = {0};
+  if (stbi__start_write_file(&s, filename)) {
+    int r = stbi_write_bmp_core(&s, x, y, comp, data);
+    stbi__end_write_file(&s);
+    return r;
+  } else
+    return 0;
+}
+#endif //! STBI_WRITE_NO_STDIO
+
+static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp,
+                               void *data) {
+  int has_alpha = (comp == 2 || comp == 4);
+  int colorbytes = has_alpha ? comp - 1 : comp;
+  int format =
+      colorbytes < 2
+          ? 3
+          : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3
+
+  if (y < 0 || x < 0)
+    return 0;
+
+  if (!stbi_write_tga_with_rle) {
+    return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *)data, has_alpha, 0,
+                          "111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y,
+                          (colorbytes + has_alpha) * 8, has_alpha * 8);
+  } else {
+    int i, j, k;
+    int jend, jdir;
+
+    stbiw__writef(s, "111 221 2222 11", 0, 0, format + 8, 0, 0, 0, 0, 0, x, y,
+                  (colorbytes + has_alpha) * 8, has_alpha * 8);
+
+    if (stbi__flip_vertically_on_write) {
+      j = 0;
+      jend = y;
+      jdir = 1;
+    } else {
+      j = y - 1;
+      jend = -1;
+      jdir = -1;
+    }
+    for (; j != jend; j += jdir) {
+      unsigned char *row = (unsigned char *)data + j * x * comp;
+      int len;
+
+      for (i = 0; i < x; i += len) {
+        unsigned char *begin = row + i * comp;
+        int diff = 1;
+        len = 1;
+
+        if (i < x - 1) {
+          ++len;
+          diff = memcmp(begin, row + (i + 1) * comp, comp);
+          if (diff) {
+            const unsigned char *prev = begin;
+            for (k = i + 2; k < x && len < 128; ++k) {
+              if (memcmp(prev, row + k * comp, comp)) {
+                prev += comp;
+                ++len;
+              } else {
+                --len;
+                break;
+              }
+            }
+          } else {
+            for (k = i + 2; k < x && len < 128; ++k) {
+              if (!memcmp(begin, row + k * comp, comp)) {
+                ++len;
+              } else {
+                break;
+              }
+            }
+          }
+        }
+
+        if (diff) {
+          unsigned char header = STBIW_UCHAR(len - 1);
+          stbiw__write1(s, header);
+          for (k = 0; k < len; ++k) {
+            stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp);
+          }
+        } else {
+          unsigned char header = STBIW_UCHAR(len - 129);
+          stbiw__write1(s, header);
+          stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin);
+        }
+      }
+    }
+    stbiw__write_flush(s);
+  }
+  return 1;
+}
+
+STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x,
+                                    int y, int comp, const void *data) {
+  stbi__write_context s = {0};
+  stbi__start_write_callbacks(&s, func, context);
+  return stbi_write_tga_core(&s, x, y, comp, (void *)data);
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp,
+                            const void *data) {
+  stbi__write_context s = {0};
+  if (stbi__start_write_file(&s, filename)) {
+    int r = stbi_write_tga_core(&s, x, y, comp, (void *)data);
+    stbi__end_write_file(&s);
+    return r;
+  } else
+    return 0;
+}
+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR writer
+// by Baldur Karlsson
+
+#define stbiw__max(a, b) ((a) > (b) ? (a) : (b))
+
+#ifndef STBI_WRITE_NO_STDIO
+
+static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) {
+  int exponent;
+  float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2]));
+
+  if (maxcomp < 1e-32f) {
+    rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0;
+  } else {
+    float normalize = (float)frexp(maxcomp, &exponent) * 256.0f / maxcomp;
+
+    rgbe[0] = (unsigned char)(linear[0] * normalize);
+    rgbe[1] = (unsigned char)(linear[1] * normalize);
+    rgbe[2] = (unsigned char)(linear[2] * normalize);
+    rgbe[3] = (unsigned char)(exponent + 128);
+  }
+}
+
+static void stbiw__write_run_data(stbi__write_context *s, int length,
+                                  unsigned char databyte) {
+  unsigned char lengthbyte = STBIW_UCHAR(length + 128);
+  STBIW_ASSERT(length + 128 <= 255);
+  s->func(s->context, &lengthbyte, 1);
+  s->func(s->context, &databyte, 1);
+}
+
+static void stbiw__write_dump_data(stbi__write_context *s, int length,
+                                   unsigned char *data) {
+  unsigned char lengthbyte = STBIW_UCHAR(length);
+  STBIW_ASSERT(length <=
+               128); // inconsistent with spec but consistent with official code
+  s->func(s->context, &lengthbyte, 1);
+  s->func(s->context, data, length);
+}
+
+static void stbiw__write_hdr_scanline(stbi__write_context *s, int width,
+                                      int ncomp, unsigned char *scratch,
+                                      float *scanline) {
+  unsigned char scanlineheader[4] = {2, 2, 0, 0};
+  unsigned char rgbe[4];
+  float linear[3];
+  int x;
+
+  scanlineheader[2] = (width & 0xff00) >> 8;
+  scanlineheader[3] = (width & 0x00ff);
+
+  /* skip RLE for images too small or large */
+  if (width < 8 || width >= 32768) {
+    for (x = 0; x < width; x++) {
+      switch (ncomp) {
+      case 4: /* fallthrough */
+      case 3:
+        linear[2] = scanline[x * ncomp + 2];
+        linear[1] = scanline[x * ncomp + 1];
+        linear[0] = scanline[x * ncomp + 0];
+        break;
+      default:
+        linear[0] = linear[1] = linear[2] = scanline[x * ncomp + 0];
+        break;
+      }
+      stbiw__linear_to_rgbe(rgbe, linear);
+      s->func(s->context, rgbe, 4);
+    }
+  } else {
+    int c, r;
+    /* encode into scratch buffer */
+    for (x = 0; x < width; x++) {
+      switch (ncomp) {
+      case 4: /* fallthrough */
+      case 3:
+        linear[2] = scanline[x * ncomp + 2];
+        linear[1] = scanline[x * ncomp + 1];
+        linear[0] = scanline[x * ncomp + 0];
+        break;
+      default:
+        linear[0] = linear[1] = linear[2] = scanline[x * ncomp + 0];
+        break;
+      }
+      stbiw__linear_to_rgbe(rgbe, linear);
+      scratch[x + width * 0] = rgbe[0];
+      scratch[x + width * 1] = rgbe[1];
+      scratch[x + width * 2] = rgbe[2];
+      scratch[x + width * 3] = rgbe[3];
+    }
+
+    s->func(s->context, scanlineheader, 4);
+
+    /* RLE each component separately */
+    for (c = 0; c < 4; c++) {
+      unsigned char *comp = &scratch[width * c];
+
+      x = 0;
+      while (x < width) {
+        // find first run
+        r = x;
+        while (r + 2 < width) {
+          if (comp[r] == comp[r + 1] && comp[r] == comp[r + 2])
+            break;
+          ++r;
+        }
+        if (r + 2 >= width)
+          r = width;
+        // dump up to first run
+        while (x < r) {
+          int len = r - x;
+          if (len > 128)
+            len = 128;
+          stbiw__write_dump_data(s, len, &comp[x]);
+          x += len;
+        }
+        // if there's a run, output it
+        if (r + 2 < width) { // same test as what we break out of in search
+                             // loop, so only true if we break'd
+          // find next byte after run
+          while (r < width && comp[r] == comp[x])
+            ++r;
+          // output run up to r
+          while (x < r) {
+            int len = r - x;
+            if (len > 127)
+              len = 127;
+            stbiw__write_run_data(s, len, comp[x]);
+            x += len;
+          }
+        }
+      }
+    }
+  }
+}
+
+static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp,
+                               float *data) {
+  if (y <= 0 || x <= 0 || data == NULL)
+    return 0;
+  else {
+    // Each component is stored separately. Allocate scratch space for full
+    // output scanline.
+    unsigned char *scratch = (unsigned char *)STBIW_MALLOC(x * 4);
+    int i, len;
+    char buffer[128];
+    char header[] =
+        "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n";
+    s->func(s->context, header, sizeof(header) - 1);
+
+#ifdef __STDC_LIB_EXT1__
+    len =
+        sprintf_s(buffer, sizeof(buffer),
+                  "EXPOSURE=          1.0000000000000\n\n-Y %d +X %d\n", y, x);
+#else
+    len = sprintf(buffer, "EXPOSURE=          1.0000000000000\n\n-Y %d +X %d\n",
+                  y, x);
+#endif
+    s->func(s->context, buffer, len);
+
+    for (i = 0; i < y; i++)
+      stbiw__write_hdr_scanline(
+          s, x, comp, scratch,
+          data + comp * x * (stbi__flip_vertically_on_write ? y - 1 - i : i));
+    STBIW_FREE(scratch);
+    return 1;
+  }
+}
+
+STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x,
+                                    int y, int comp, const float *data) {
+  stbi__write_context s = {0};
+  stbi__start_write_callbacks(&s, func, context);
+  return stbi_write_hdr_core(&s, x, y, comp, (float *)data);
+}
+
+STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp,
+                            const float *data) {
+  stbi__write_context s = {0};
+  if (stbi__start_write_file(&s, filename)) {
+    int r = stbi_write_hdr_core(&s, x, y, comp, (float *)data);
+    stbi__end_write_file(&s);
+    return r;
+  } else
+    return 0;
+}
+#endif // STBI_WRITE_NO_STDIO
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PNG writer
+//
+
+#ifndef STBIW_ZLIB_COMPRESS
+// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount()
+// == vector<>::size()
+#define stbiw__sbraw(a) ((int *)(void *)(a) - 2)
+#define stbiw__sbm(a) stbiw__sbraw(a)[0]
+#define stbiw__sbn(a) stbiw__sbraw(a)[1]
+
+#define stbiw__sbneedgrow(a, n) ((a) == 0 || stbiw__sbn(a) + n >= stbiw__sbm(a))
+#define stbiw__sbmaybegrow(a, n)                                               \
+  (stbiw__sbneedgrow(a, (n)) ? stbiw__sbgrow(a, n) : 0)
+#define stbiw__sbgrow(a, n) stbiw__sbgrowf((void **)&(a), (n), sizeof(*(a)))
+
+#define stbiw__sbpush(a, v)                                                    \
+  (stbiw__sbmaybegrow(a, 1), (a)[stbiw__sbn(a)++] = (v))
+#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0)
+#define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)), 0 : 0)
+
+static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) {
+  int m = *arr ? 2 * stbiw__sbm(*arr) + increment : increment + 1;
+  void *p = STBIW_REALLOC_SIZED(
+      *arr ? stbiw__sbraw(*arr) : 0,
+      *arr ? (stbiw__sbm(*arr) * itemsize + sizeof(int) * 2) : 0,
+      itemsize * m + sizeof(int) * 2);
+  STBIW_ASSERT(p);
+  if (p) {
+    if (!*arr)
+      ((int *)p)[1] = 0;
+    *arr = (void *)((int *)p + 2);
+    stbiw__sbm(*arr) = m;
+  }
+  return *arr;
+}
+
+static unsigned char *stbiw__zlib_flushf(unsigned char *data,
+                                         unsigned int *bitbuffer,
+                                         int *bitcount) {
+  while (*bitcount >= 8) {
+    stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer));
+    *bitbuffer >>= 8;
+    *bitcount -= 8;
+  }
+  return data;
+}
+
+static int stbiw__zlib_bitrev(int code, int codebits) {
+  int res = 0;
+  while (codebits--) {
+    res = (res << 1) | (code & 1);
+    code >>= 1;
+  }
+  return res;
+}
+
+static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b,
+                                       int limit) {
+  int i;
+  for (i = 0; i < limit && i < 258; ++i)
+    if (a[i] != b[i])
+      break;
+  return i;
+}
+
+static unsigned int stbiw__zhash(unsigned char *data) {
+  stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16);
+  hash ^= hash << 3;
+  hash += hash >> 5;
+  hash ^= hash << 4;
+  hash += hash >> 17;
+  hash ^= hash << 25;
+  hash += hash >> 6;
+  return hash;
+}
+
+#define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount))
+#define stbiw__zlib_add(code, codebits)                                        \
+  (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush())
+#define stbiw__zlib_huffa(b, c) stbiw__zlib_add(stbiw__zlib_bitrev(b, c), c)
+// default huffman tables
+#define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8)
+#define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n) - 144, 9)
+#define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n) - 256, 7)
+#define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n) - 280, 8)
+#define stbiw__zlib_huff(n)                                                    \
+  ((n) <= 143   ? stbiw__zlib_huff1(n)                                         \
+   : (n) <= 255 ? stbiw__zlib_huff2(n)                                         \
+   : (n) <= 279 ? stbiw__zlib_huff3(n)                                         \
+                : stbiw__zlib_huff4(n))
+#define stbiw__zlib_huffb(n)                                                   \
+  ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n))
+
+#define stbiw__ZHASH 16384
+
+#endif // STBIW_ZLIB_COMPRESS
+
+STBIWDEF unsigned char *stbi_zlib_compress(unsigned char *data, int data_len,
+                                           int *out_len, int quality) {
+#ifdef STBIW_ZLIB_COMPRESS
+  // user provided a zlib compress implementation, use that
+  return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality);
+#else  // use builtin
+  static unsigned short lengthc[] = {
+      3,  4,  5,  6,  7,  8,  9,  10, 11,  13,  15,  17,  19,  23,  27,
+      31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 259};
+  static unsigned char lengtheb[] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
+                                     1, 1, 2, 2, 2, 2, 3, 3, 3, 3,
+                                     4, 4, 4, 4, 5, 5, 5, 5, 0};
+  static unsigned short distc[] = {
+      1,    2,    3,    4,    5,    7,     9,     13,    17,   25,   33,
+      49,   65,   97,   129,  193,  257,   385,   513,   769,  1025, 1537,
+      2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577, 32768};
+  static unsigned char disteb[] = {0, 0, 0,  0,  1,  1,  2,  2,  3,  3,
+                                   4, 4, 5,  5,  6,  6,  7,  7,  8,  8,
+                                   9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
+  unsigned int bitbuf = 0;
+  int i, j, bitcount = 0;
+  unsigned char *out = NULL;
+  unsigned char ***hash_table =
+      (unsigned char ***)STBIW_MALLOC(stbiw__ZHASH * sizeof(unsigned char **));
+  if (hash_table == NULL)
+    return NULL;
+  if (quality < 5)
+    quality = 5;
+
+  stbiw__sbpush(out, 0x78); // DEFLATE 32K window
+  stbiw__sbpush(out, 0x5e); // FLEVEL = 1
+  stbiw__zlib_add(1, 1);    // BFINAL = 1
+  stbiw__zlib_add(1, 2);    // BTYPE = 1 -- fixed huffman
+
+  for (i = 0; i < stbiw__ZHASH; ++i)
+    hash_table[i] = NULL;
+
+  i = 0;
+  while (i < data_len - 3) {
+    // hash next 3 bytes of data to be compressed
+    int h = stbiw__zhash(data + i) & (stbiw__ZHASH - 1), best = 3;
+    unsigned char *bestloc = 0;
+    unsigned char **hlist = hash_table[h];
+    int n = stbiw__sbcount(hlist);
+    for (j = 0; j < n; ++j) {
+      if (hlist[j] - data > i - 32768) { // if entry lies within window
+        int d = stbiw__zlib_countm(hlist[j], data + i, data_len - i);
+        if (d >= best) {
+          best = d;
+          bestloc = hlist[j];
+        }
+      }
+    }
+    // when hash table entry is too long, delete half the entries
+    if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2 * quality) {
+      STBIW_MEMMOVE(hash_table[h], hash_table[h] + quality,
+                    sizeof(hash_table[h][0]) * quality);
+      stbiw__sbn(hash_table[h]) = quality;
+    }
+    stbiw__sbpush(hash_table[h], data + i);
+
+    if (bestloc) {
+      // "lazy matching" - check match at *next* byte, and if it's better, do
+      // cur byte as literal
+      h = stbiw__zhash(data + i + 1) & (stbiw__ZHASH - 1);
+      hlist = hash_table[h];
+      n = stbiw__sbcount(hlist);
+      for (j = 0; j < n; ++j) {
+        if (hlist[j] - data > i - 32767) {
+          int e = stbiw__zlib_countm(hlist[j], data + i + 1, data_len - i - 1);
+          if (e > best) { // if next match is better, bail on current match
+            bestloc = NULL;
+            break;
+          }
+        }
+      }
+    }
+
+    if (bestloc) {
+      int d = (int)(data + i - bestloc); // distance back
+      STBIW_ASSERT(d <= 32767 && best <= 258);
+      for (j = 0; best > lengthc[j + 1] - 1; ++j)
+        ;
+      stbiw__zlib_huff(j + 257);
+      if (lengtheb[j])
+        stbiw__zlib_add(best - lengthc[j], lengtheb[j]);
+      for (j = 0; d > distc[j + 1] - 1; ++j)
+        ;
+      stbiw__zlib_add(stbiw__zlib_bitrev(j, 5), 5);
+      if (disteb[j])
+        stbiw__zlib_add(d - distc[j], disteb[j]);
+      i += best;
+    } else {
+      stbiw__zlib_huffb(data[i]);
+      ++i;
+    }
+  }
+  // write out final bytes
+  for (; i < data_len; ++i)
+    stbiw__zlib_huffb(data[i]);
+  stbiw__zlib_huff(256); // end of block
+  // pad with 0 bits to byte boundary
+  while (bitcount)
+    stbiw__zlib_add(0, 1);
+
+  for (i = 0; i < stbiw__ZHASH; ++i)
+    (void)stbiw__sbfree(hash_table[i]);
+  STBIW_FREE(hash_table);
+
+  // store uncompressed instead if compression was worse
+  if (stbiw__sbn(out) > data_len + 2 + ((data_len + 32766) / 32767) * 5) {
+    stbiw__sbn(out) = 2; // truncate to DEFLATE 32K window and FLEVEL = 1
+    for (j = 0; j < data_len;) {
+      int blocklen = data_len - j;
+      if (blocklen > 32767)
+        blocklen = 32767;
+      stbiw__sbpush(out,
+                    data_len - j ==
+                        blocklen); // BFINAL = ?, BTYPE = 0 -- no compression
+      stbiw__sbpush(out, STBIW_UCHAR(blocklen)); // LEN
+      stbiw__sbpush(out, STBIW_UCHAR(blocklen >> 8));
+      stbiw__sbpush(out, STBIW_UCHAR(~blocklen)); // NLEN
+      stbiw__sbpush(out, STBIW_UCHAR(~blocklen >> 8));
+      memcpy(out + stbiw__sbn(out), data + j, blocklen);
+      stbiw__sbn(out) += blocklen;
+      j += blocklen;
+    }
+  }
+
+  {
+    // compute adler32 on input
+    unsigned int s1 = 1, s2 = 0;
+    int blocklen = (int)(data_len % 5552);
+    j = 0;
+    while (j < data_len) {
+      for (i = 0; i < blocklen; ++i) {
+        s1 += data[j + i];
+        s2 += s1;
+      }
+      s1 %= 65521;
+      s2 %= 65521;
+      j += blocklen;
+      blocklen = 5552;
+    }
+    stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8));
+    stbiw__sbpush(out, STBIW_UCHAR(s2));
+    stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8));
+    stbiw__sbpush(out, STBIW_UCHAR(s1));
+  }
+  *out_len = stbiw__sbn(out);
+  // make returned pointer freeable
+  STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len);
+  return (unsigned char *)stbiw__sbraw(out);
+#endif // STBIW_ZLIB_COMPRESS
+}
+
+static unsigned int stbiw__crc32(unsigned char *buffer, int len) {
+#ifdef STBIW_CRC32
+  return STBIW_CRC32(buffer, len);
+#else
+  static unsigned int crc_table[256] = {
+      0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
+      0xE963A535, 0x9E6495A3, 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
+      0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
+      0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+      0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
+      0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
+      0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
+      0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+      0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
+      0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
+      0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
+      0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+      0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
+      0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
+      0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
+      0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+      0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
+      0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
+      0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
+      0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+      0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
+      0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
+      0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
+      0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+      0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
+      0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
+      0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
+      0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+      0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
+      0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
+      0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
+      0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+      0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
+      0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
+      0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
+      0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+      0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
+      0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
+      0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
+      0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+      0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
+      0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
+      0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};
+
+  unsigned int crc = ~0u;
+  int i;
+  for (i = 0; i < len; ++i)
+    crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)];
+  return ~crc;
+#endif
+}
+
+#define stbiw__wpng4(o, a, b, c, d)                                            \
+  ((o)[0] = STBIW_UCHAR(a), (o)[1] = STBIW_UCHAR(b), (o)[2] = STBIW_UCHAR(c),  \
+   (o)[3] = STBIW_UCHAR(d), (o) += 4)
+#define stbiw__wp32(data, v)                                                   \
+  stbiw__wpng4(data, (v) >> 24, (v) >> 16, (v) >> 8, (v));
+#define stbiw__wptag(data, s) stbiw__wpng4(data, s[0], s[1], s[2], s[3])
+
+static void stbiw__wpcrc(unsigned char **data, int len) {
+  unsigned int crc = stbiw__crc32(*data - len - 4, len + 4);
+  stbiw__wp32(*data, crc);
+}
+
+static unsigned char stbiw__paeth(int a, int b, int c) {
+  int p = a + b - c, pa = abs(p - a), pb = abs(p - b), pc = abs(p - c);
+  if (pa <= pb && pa <= pc)
+    return STBIW_UCHAR(a);
+  if (pb <= pc)
+    return STBIW_UCHAR(b);
+  return STBIW_UCHAR(c);
+}
+
+// @OPTIMIZE: provide an option that always forces left-predict or paeth predict
+static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes,
+                                   int width, int height, int y, int n,
+                                   int filter_type, signed char *line_buffer) {
+  static int mapping[] = {0, 1, 2, 3, 4};
+  static int firstmap[] = {0, 1, 0, 5, 6};
+  int *mymap = (y != 0) ? mapping : firstmap;
+  int i;
+  int type = mymap[filter_type];
+  unsigned char *z =
+      pixels +
+      stride_bytes * (stbi__flip_vertically_on_write ? height - 1 - y : y);
+  int signed_stride =
+      stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes;
+
+  if (type == 0) {
+    memcpy(line_buffer, z, width * n);
+    return;
+  }
+
+  // first loop isn't optimized since it's just one pixel
+  for (i = 0; i < n; ++i) {
+    switch (type) {
+    case 1:
+      line_buffer[i] = z[i];
+      break;
+    case 2:
+      line_buffer[i] = z[i] - z[i - signed_stride];
+      break;
+    case 3:
+      line_buffer[i] = z[i] - (z[i - signed_stride] >> 1);
+      break;
+    case 4:
+      line_buffer[i] =
+          (signed char)(z[i] - stbiw__paeth(0, z[i - signed_stride], 0));
+      break;
+    case 5:
+      line_buffer[i] = z[i];
+      break;
+    case 6:
+      line_buffer[i] = z[i];
+      break;
+    }
+  }
+  switch (type) {
+  case 1:
+    for (i = n; i < width * n; ++i)
+      line_buffer[i] = z[i] - z[i - n];
+    break;
+  case 2:
+    for (i = n; i < width * n; ++i)
+      line_buffer[i] = z[i] - z[i - signed_stride];
+    break;
+  case 3:
+    for (i = n; i < width * n; ++i)
+      line_buffer[i] = z[i] - ((z[i - n] + z[i - signed_stride]) >> 1);
+    break;
+  case 4:
+    for (i = n; i < width * n; ++i)
+      line_buffer[i] = z[i] - stbiw__paeth(z[i - n], z[i - signed_stride],
+                                           z[i - signed_stride - n]);
+    break;
+  case 5:
+    for (i = n; i < width * n; ++i)
+      line_buffer[i] = z[i] - (z[i - n] >> 1);
+    break;
+  case 6:
+    for (i = n; i < width * n; ++i)
+      line_buffer[i] = z[i] - stbiw__paeth(z[i - n], 0, 0);
+    break;
+  }
+}
+
+STBIWDEF unsigned char *stbi_write_png_to_mem(const unsigned char *pixels,
+                                              int stride_bytes, int x, int y,
+                                              int n, int *out_len) {
+  int force_filter = stbi_write_force_png_filter;
+  int ctype[5] = {-1, 0, 4, 2, 6};
+  unsigned char sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+  unsigned char *out, *o, *filt, *zlib;
+  signed char *line_buffer;
+  int j, zlen;
+
+  if (stride_bytes == 0)
+    stride_bytes = x * n;
+
+  if (force_filter >= 5) {
+    force_filter = -1;
+  }
+
+  filt = (unsigned char *)STBIW_MALLOC((x * n + 1) * y);
+  if (!filt)
+    return 0;
+  line_buffer = (signed char *)STBIW_MALLOC(x * n);
+  if (!line_buffer) {
+    STBIW_FREE(filt);
+    return 0;
+  }
+  for (j = 0; j < y; ++j) {
+    int filter_type;
+    if (force_filter > -1) {
+      filter_type = force_filter;
+      stbiw__encode_png_line((unsigned char *)(pixels), stride_bytes, x, y, j,
+                             n, force_filter, line_buffer);
+    } else { // Estimate the best filter by running through all of them:
+      int best_filter = 0, best_filter_val = 0x7fffffff, est, i;
+      for (filter_type = 0; filter_type < 5; filter_type++) {
+        stbiw__encode_png_line((unsigned char *)(pixels), stride_bytes, x, y, j,
+                               n, filter_type, line_buffer);
+
+        // Estimate the entropy of the line using this filter; the less, the
+        // better.
+        est = 0;
+        for (i = 0; i < x * n; ++i) {
+          est += abs((signed char)line_buffer[i]);
+        }
+        if (est < best_filter_val) {
+          best_filter_val = est;
+          best_filter = filter_type;
+        }
+      }
+      if (filter_type != best_filter) { // If the last iteration already got us
+                                        // the best filter, don't redo it
+        stbiw__encode_png_line((unsigned char *)(pixels), stride_bytes, x, y, j,
+                               n, best_filter, line_buffer);
+        filter_type = best_filter;
+      }
+    }
+    // when we get here, filter_type contains the filter type, and line_buffer
+    // contains the data
+    filt[j * (x * n + 1)] = (unsigned char)filter_type;
+    STBIW_MEMMOVE(filt + j * (x * n + 1) + 1, line_buffer, x * n);
+  }
+  STBIW_FREE(line_buffer);
+  zlib = stbi_zlib_compress(filt, y * (x * n + 1), &zlen,
+                            stbi_write_png_compression_level);
+  STBIW_FREE(filt);
+  if (!zlib)
+    return 0;
+
+  // each tag requires 12 bytes of overhead
+  out = (unsigned char *)STBIW_MALLOC(8 + 12 + 13 + 12 + zlen + 12);
+  if (!out)
+    return 0;
+  *out_len = 8 + 12 + 13 + 12 + zlen + 12;
+
+  o = out;
+  STBIW_MEMMOVE(o, sig, 8);
+  o += 8;
+  stbiw__wp32(o, 13); // header length
+  stbiw__wptag(o, "IHDR");
+  stbiw__wp32(o, x);
+  stbiw__wp32(o, y);
+  *o++ = 8;
+  *o++ = STBIW_UCHAR(ctype[n]);
+  *o++ = 0;
+  *o++ = 0;
+  *o++ = 0;
+  stbiw__wpcrc(&o, 13);
+
+  stbiw__wp32(o, zlen);
+  stbiw__wptag(o, "IDAT");
+  STBIW_MEMMOVE(o, zlib, zlen);
+  o += zlen;
+  STBIW_FREE(zlib);
+  stbiw__wpcrc(&o, zlen);
+
+  stbiw__wp32(o, 0);
+  stbiw__wptag(o, "IEND");
+  stbiw__wpcrc(&o, 0);
+
+  STBIW_ASSERT(o == out + *out_len);
+
+  return out;
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp,
+                            const void *data, int stride_bytes) {
+  FILE *f;
+  int len;
+  unsigned char *png = stbi_write_png_to_mem((const unsigned char *)data,
+                                             stride_bytes, x, y, comp, &len);
+  if (png == NULL)
+    return 0;
+
+  f = stbiw__fopen(filename, "wb");
+  if (!f) {
+    STBIW_FREE(png);
+    return 0;
+  }
+  fwrite(png, 1, len, f);
+  fclose(f);
+  STBIW_FREE(png);
+  return 1;
+}
+#endif
+
+STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x,
+                                    int y, int comp, const void *data,
+                                    int stride_bytes) {
+  int len;
+  unsigned char *png = stbi_write_png_to_mem((const unsigned char *)data,
+                                             stride_bytes, x, y, comp, &len);
+  if (png == NULL)
+    return 0;
+  func(context, png, len);
+  STBIW_FREE(png);
+  return 1;
+}
+
+/* ***************************************************************************
+ *
+ * JPEG writer
+ *
+ * This is based on Jon Olick's jo_jpeg.cpp:
+ * public domain Simple, Minimalistic JPEG writer -
+ * http://www.jonolick.com/code.html
+ */
+
+static const unsigned char stbiw__jpg_ZigZag[] = {
+    0,  1,  5,  6,  14, 15, 27, 28, 2,  4,  7,  13, 16, 26, 29, 42,
+    3,  8,  12, 17, 25, 30, 41, 43, 9,  11, 18, 24, 31, 40, 44, 53,
+    10, 19, 23, 32, 39, 45, 52, 54, 20, 22, 33, 38, 46, 51, 55, 60,
+    21, 34, 37, 47, 50, 56, 59, 61, 35, 36, 48, 49, 57, 58, 62, 63};
+
+static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP,
+                                 int *bitCntP, const unsigned short *bs) {
+  int bitBuf = *bitBufP, bitCnt = *bitCntP;
+  bitCnt += bs[1];
+  bitBuf |= bs[0] << (24 - bitCnt);
+  while (bitCnt >= 8) {
+    unsigned char c = (bitBuf >> 16) & 255;
+    stbiw__putc(s, c);
+    if (c == 255) {
+      stbiw__putc(s, 0);
+    }
+    bitBuf <<= 8;
+    bitCnt -= 8;
+  }
+  *bitBufP = bitBuf;
+  *bitCntP = bitCnt;
+}
+
+static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p,
+                           float *d4p, float *d5p, float *d6p, float *d7p) {
+  float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p,
+        d6 = *d6p, d7 = *d7p;
+  float z1, z2, z3, z4, z5, z11, z13;
+
+  float tmp0 = d0 + d7;
+  float tmp7 = d0 - d7;
+  float tmp1 = d1 + d6;
+  float tmp6 = d1 - d6;
+  float tmp2 = d2 + d5;
+  float tmp5 = d2 - d5;
+  float tmp3 = d3 + d4;
+  float tmp4 = d3 - d4;
+
+  // Even part
+  float tmp10 = tmp0 + tmp3; // phase 2
+  float tmp13 = tmp0 - tmp3;
+  float tmp11 = tmp1 + tmp2;
+  float tmp12 = tmp1 - tmp2;
+
+  d0 = tmp10 + tmp11; // phase 3
+  d4 = tmp10 - tmp11;
+
+  z1 = (tmp12 + tmp13) * 0.707106781f; // c4
+  d2 = tmp13 + z1;                     // phase 5
+  d6 = tmp13 - z1;
+
+  // Odd part
+  tmp10 = tmp4 + tmp5; // phase 2
+  tmp11 = tmp5 + tmp6;
+  tmp12 = tmp6 + tmp7;
+
+  // The rotator is modified from fig 4-8 to avoid extra negations.
+  z5 = (tmp10 - tmp12) * 0.382683433f; // c6
+  z2 = tmp10 * 0.541196100f + z5;      // c2-c6
+  z4 = tmp12 * 1.306562965f + z5;      // c2+c6
+  z3 = tmp11 * 0.707106781f;           // c4
+
+  z11 = tmp7 + z3; // phase 5
+  z13 = tmp7 - z3;
+
+  *d5p = z13 + z2; // phase 6
+  *d3p = z13 - z2;
+  *d1p = z11 + z4;
+  *d7p = z11 - z4;
+
+  *d0p = d0;
+  *d2p = d2;
+  *d4p = d4;
+  *d6p = d6;
+}
+
+static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) {
+  int tmp1 = val < 0 ? -val : val;
+  val = val < 0 ? val - 1 : val;
+  bits[1] = 1;
+  while (tmp1 >>= 1) {
+    ++bits[1];
+  }
+  bits[0] = val & ((1 << bits[1]) - 1);
+}
+
+static int stbiw__jpg_processDU(stbi__write_context *s, int *bitBuf,
+                                int *bitCnt, float *CDU, int du_stride,
+                                float *fdtbl, int DC,
+                                const unsigned short HTDC[256][2],
+                                const unsigned short HTAC[256][2]) {
+  const unsigned short EOB[2] = {HTAC[0x00][0], HTAC[0x00][1]};
+  const unsigned short M16zeroes[2] = {HTAC[0xF0][0], HTAC[0xF0][1]};
+  int dataOff, i, j, n, diff, end0pos, x, y;
+  int DU[64];
+
+  // DCT rows
+  for (dataOff = 0, n = du_stride * 8; dataOff < n; dataOff += du_stride) {
+    stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff + 1], &CDU[dataOff + 2],
+                   &CDU[dataOff + 3], &CDU[dataOff + 4], &CDU[dataOff + 5],
+                   &CDU[dataOff + 6], &CDU[dataOff + 7]);
+  }
+  // DCT columns
+  for (dataOff = 0; dataOff < 8; ++dataOff) {
+    stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff + du_stride],
+                   &CDU[dataOff + du_stride * 2], &CDU[dataOff + du_stride * 3],
+                   &CDU[dataOff + du_stride * 4], &CDU[dataOff + du_stride * 5],
+                   &CDU[dataOff + du_stride * 6],
+                   &CDU[dataOff + du_stride * 7]);
+  }
+  // Quantize/descale/zigzag the coefficients
+  for (y = 0, j = 0; y < 8; ++y) {
+    for (x = 0; x < 8; ++x, ++j) {
+      float v;
+      i = y * du_stride + x;
+      v = CDU[i] * fdtbl[j];
+      // DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? ceilf(v - 0.5f) : floorf(v +
+      // 0.5f)); ceilf() and floorf() are C99, not C89, but I /think/ they're
+      // not needed here anyway?
+      DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? v - 0.5f : v + 0.5f);
+    }
+  }
+
+  // Encode DC
+  diff = DU[0] - DC;
+  if (diff == 0) {
+    stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[0]);
+  } else {
+    unsigned short bits[2];
+    stbiw__jpg_calcBits(diff, bits);
+    stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[bits[1]]);
+    stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
+  }
+  // Encode ACs
+  end0pos = 63;
+  for (; (end0pos > 0) && (DU[end0pos] == 0); --end0pos) {
+  }
+  // end0pos = first element in reverse order !=0
+  if (end0pos == 0) {
+    stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
+    return DU[0];
+  }
+  for (i = 1; i <= end0pos; ++i) {
+    int startpos = i;
+    int nrzeroes;
+    unsigned short bits[2];
+    for (; DU[i] == 0 && i <= end0pos; ++i) {
+    }
+    nrzeroes = i - startpos;
+    if (nrzeroes >= 16) {
+      int lng = nrzeroes >> 4;
+      int nrmarker;
+      for (nrmarker = 1; nrmarker <= lng; ++nrmarker)
+        stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes);
+      nrzeroes &= 15;
+    }
+    stbiw__jpg_calcBits(DU[i], bits);
+    stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes << 4) + bits[1]]);
+    stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
+  }
+  if (end0pos != 63) {
+    stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
+  }
+  return DU[0];
+}
+
+static int stbi_write_jpg_core(stbi__write_context *s, int width, int height,
+                               int comp, const void *data, int quality) {
+  // Constants that don't pollute global namespace
+  static const unsigned char std_dc_luminance_nrcodes[] = {
+      0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0};
+  static const unsigned char std_dc_luminance_values[] = {0, 1, 2, 3, 4,  5,
+                                                          6, 7, 8, 9, 10, 11};
+  static const unsigned char std_ac_luminance_nrcodes[] = {
+      0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d};
+  static const unsigned char std_ac_luminance_values[] = {
+      0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06,
+      0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
+      0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72,
+      0x82, 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
+      0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45,
+      0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+      0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75,
+      0x76, 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+      0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3,
+      0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
+      0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9,
+      0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
+      0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4,
+      0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa};
+  static const unsigned char std_dc_chrominance_nrcodes[] = {
+      0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0};
+  static const unsigned char std_dc_chrominance_values[] = {0, 1, 2, 3, 4,  5,
+                                                            6, 7, 8, 9, 10, 11};
+  static const unsigned char std_ac_chrominance_nrcodes[] = {
+      0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77};
+  static const unsigned char std_ac_chrominance_values[] = {
+      0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41,
+      0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+      0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1,
+      0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
+      0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44,
+      0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+      0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74,
+      0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+      0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a,
+      0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
+      0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
+      0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
+      0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4,
+      0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa};
+  // Huffman tables
+  static const unsigned short YDC_HT[256][2] = {
+      {0, 2},  {2, 3},  {3, 3},  {4, 3},   {5, 3},   {6, 3},
+      {14, 4}, {30, 5}, {62, 6}, {126, 7}, {254, 8}, {510, 9}};
+  static const unsigned short UVDC_HT[256][2] = {
+      {0, 2},  {1, 2},   {2, 2},   {6, 3},   {14, 4},    {30, 5},
+      {62, 6}, {126, 7}, {254, 8}, {510, 9}, {1022, 10}, {2046, 11}};
+  static const unsigned short YAC_HT[256][2] = {
+      {10, 4},     {0, 2},      {1, 2},      {4, 3},      {11, 4},
+      {26, 5},     {120, 7},    {248, 8},    {1014, 10},  {65410, 16},
+      {65411, 16}, {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {12, 4},     {27, 5},     {121, 7},
+      {502, 9},    {2038, 11},  {65412, 16}, {65413, 16}, {65414, 16},
+      {65415, 16}, {65416, 16}, {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {28, 5},     {249, 8},
+      {1015, 10},  {4084, 12},  {65417, 16}, {65418, 16}, {65419, 16},
+      {65420, 16}, {65421, 16}, {65422, 16}, {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {58, 6},
+      {503, 9},    {4085, 12},  {65423, 16}, {65424, 16}, {65425, 16},
+      {65426, 16}, {65427, 16}, {65428, 16}, {65429, 16}, {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {59, 6},     {1016, 10},  {65430, 16}, {65431, 16}, {65432, 16},
+      {65433, 16}, {65434, 16}, {65435, 16}, {65436, 16}, {65437, 16},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {122, 7},    {2039, 11},  {65438, 16}, {65439, 16},
+      {65440, 16}, {65441, 16}, {65442, 16}, {65443, 16}, {65444, 16},
+      {65445, 16}, {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {123, 7},    {4086, 12},  {65446, 16},
+      {65447, 16}, {65448, 16}, {65449, 16}, {65450, 16}, {65451, 16},
+      {65452, 16}, {65453, 16}, {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {250, 8},    {4087, 12},
+      {65454, 16}, {65455, 16}, {65456, 16}, {65457, 16}, {65458, 16},
+      {65459, 16}, {65460, 16}, {65461, 16}, {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {504, 9},
+      {32704, 15}, {65462, 16}, {65463, 16}, {65464, 16}, {65465, 16},
+      {65466, 16}, {65467, 16}, {65468, 16}, {65469, 16}, {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {505, 9},    {65470, 16}, {65471, 16}, {65472, 16}, {65473, 16},
+      {65474, 16}, {65475, 16}, {65476, 16}, {65477, 16}, {65478, 16},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {506, 9},    {65479, 16}, {65480, 16}, {65481, 16},
+      {65482, 16}, {65483, 16}, {65484, 16}, {65485, 16}, {65486, 16},
+      {65487, 16}, {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {1017, 10},  {65488, 16}, {65489, 16},
+      {65490, 16}, {65491, 16}, {65492, 16}, {65493, 16}, {65494, 16},
+      {65495, 16}, {65496, 16}, {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {1018, 10},  {65497, 16},
+      {65498, 16}, {65499, 16}, {65500, 16}, {65501, 16}, {65502, 16},
+      {65503, 16}, {65504, 16}, {65505, 16}, {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {2040, 11},
+      {65506, 16}, {65507, 16}, {65508, 16}, {65509, 16}, {65510, 16},
+      {65511, 16}, {65512, 16}, {65513, 16}, {65514, 16}, {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {65515, 16}, {65516, 16}, {65517, 16}, {65518, 16}, {65519, 16},
+      {65520, 16}, {65521, 16}, {65522, 16}, {65523, 16}, {65524, 16},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {2041, 11},  {65525, 16}, {65526, 16}, {65527, 16}, {65528, 16},
+      {65529, 16}, {65530, 16}, {65531, 16}, {65532, 16}, {65533, 16},
+      {65534, 16}, {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0}};
+  static const unsigned short UVAC_HT[256][2] = {
+      {0, 2},      {1, 2},      {4, 3},      {10, 4},     {24, 5},
+      {25, 5},     {56, 6},     {120, 7},    {500, 9},    {1014, 10},
+      {4084, 12},  {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {11, 4},     {57, 6},     {246, 8},
+      {501, 9},    {2038, 11},  {4085, 12},  {65416, 16}, {65417, 16},
+      {65418, 16}, {65419, 16}, {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {26, 5},     {247, 8},
+      {1015, 10},  {4086, 12},  {32706, 15}, {65420, 16}, {65421, 16},
+      {65422, 16}, {65423, 16}, {65424, 16}, {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {27, 5},
+      {248, 8},    {1016, 10},  {4087, 12},  {65425, 16}, {65426, 16},
+      {65427, 16}, {65428, 16}, {65429, 16}, {65430, 16}, {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {58, 6},     {502, 9},    {65431, 16}, {65432, 16}, {65433, 16},
+      {65434, 16}, {65435, 16}, {65436, 16}, {65437, 16}, {65438, 16},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {59, 6},     {1017, 10},  {65439, 16}, {65440, 16},
+      {65441, 16}, {65442, 16}, {65443, 16}, {65444, 16}, {65445, 16},
+      {65446, 16}, {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {121, 7},    {2039, 11},  {65447, 16},
+      {65448, 16}, {65449, 16}, {65450, 16}, {65451, 16}, {65452, 16},
+      {65453, 16}, {65454, 16}, {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {122, 7},    {2040, 11},
+      {65455, 16}, {65456, 16}, {65457, 16}, {65458, 16}, {65459, 16},
+      {65460, 16}, {65461, 16}, {65462, 16}, {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {249, 8},
+      {65463, 16}, {65464, 16}, {65465, 16}, {65466, 16}, {65467, 16},
+      {65468, 16}, {65469, 16}, {65470, 16}, {65471, 16}, {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {503, 9},    {65472, 16}, {65473, 16}, {65474, 16}, {65475, 16},
+      {65476, 16}, {65477, 16}, {65478, 16}, {65479, 16}, {65480, 16},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {504, 9},    {65481, 16}, {65482, 16}, {65483, 16},
+      {65484, 16}, {65485, 16}, {65486, 16}, {65487, 16}, {65488, 16},
+      {65489, 16}, {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {505, 9},    {65490, 16}, {65491, 16},
+      {65492, 16}, {65493, 16}, {65494, 16}, {65495, 16}, {65496, 16},
+      {65497, 16}, {65498, 16}, {0, 0},      {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {506, 9},    {65499, 16},
+      {65500, 16}, {65501, 16}, {65502, 16}, {65503, 16}, {65504, 16},
+      {65505, 16}, {65506, 16}, {65507, 16}, {0, 0},      {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {2041, 11},
+      {65508, 16}, {65509, 16}, {65510, 16}, {65511, 16}, {65512, 16},
+      {65513, 16}, {65514, 16}, {65515, 16}, {65516, 16}, {0, 0},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {16352, 14}, {65517, 16}, {65518, 16}, {65519, 16}, {65520, 16},
+      {65521, 16}, {65522, 16}, {65523, 16}, {65524, 16}, {65525, 16},
+      {0, 0},      {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {1018, 10},  {32707, 15}, {65526, 16}, {65527, 16}, {65528, 16},
+      {65529, 16}, {65530, 16}, {65531, 16}, {65532, 16}, {65533, 16},
+      {65534, 16}, {0, 0},      {0, 0},      {0, 0},      {0, 0},
+      {0, 0}};
+  static const int YQT[] = {
+      16, 11, 10, 16, 24,  40,  51,  61,  12, 12, 14, 19, 26,  58,  60,  55,
+      14, 13, 16, 24, 40,  57,  69,  56,  14, 17, 22, 29, 51,  87,  80,  62,
+      18, 22, 37, 56, 68,  109, 103, 77,  24, 35, 55, 64, 81,  104, 113, 92,
+      49, 64, 78, 87, 103, 121, 120, 101, 72, 92, 95, 98, 112, 100, 103, 99};
+  static const int UVQT[] = {17, 18, 24, 47, 99, 99, 99, 99, 18, 21, 26, 66, 99,
+                             99, 99, 99, 24, 26, 56, 99, 99, 99, 99, 99, 47, 66,
+                             99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
+                             99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
+                             99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99};
+  static const float aasf[] = {
+      1.0f * 2.828427125f,         1.387039845f * 2.828427125f,
+      1.306562965f * 2.828427125f, 1.175875602f * 2.828427125f,
+      1.0f * 2.828427125f,         0.785694958f * 2.828427125f,
+      0.541196100f * 2.828427125f, 0.275899379f * 2.828427125f};
+
+  int row, col, i, k, subsample;
+  float fdtbl_Y[64], fdtbl_UV[64];
+  unsigned char YTable[64], UVTable[64];
+
+  if (!data || !width || !height || comp > 4 || comp < 1) {
+    return 0;
+  }
+
+  quality = quality ? quality : 90;
+  subsample = quality <= 90 ? 1 : 0;
+  quality = quality < 1 ? 1 : quality > 100 ? 100 : quality;
+  quality = quality < 50 ? 5000 / quality : 200 - quality * 2;
+
+  for (i = 0; i < 64; ++i) {
+    int uvti, yti = (YQT[i] * quality + 50) / 100;
+    YTable[stbiw__jpg_ZigZag[i]] = (unsigned char)(yti < 1     ? 1
+                                                   : yti > 255 ? 255
+                                                               : yti);
+    uvti = (UVQT[i] * quality + 50) / 100;
+    UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char)(uvti < 1     ? 1
+                                                    : uvti > 255 ? 255
+                                                                 : uvti);
+  }
+
+  for (row = 0, k = 0; row < 8; ++row) {
+    for (col = 0; col < 8; ++col, ++k) {
+      fdtbl_Y[k] = 1 / (YTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]);
+      fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]);
+    }
+  }
+
+  // Write Headers
+  {
+    static const unsigned char head0[] = {
+        0xFF, 0xD8, 0xFF, 0xE0, 0, 0x10, 'J', 'F',  'I',  'F', 0,    1, 1,
+        0,    0,    1,    0,    1, 0,    0,   0xFF, 0xDB, 0,   0x84, 0};
+    static const unsigned char head2[] = {0xFF, 0xDA, 0, 0xC,  3, 1,    0,
+                                          2,    0x11, 3, 0x11, 0, 0x3F, 0};
+    const unsigned char head1[] = {0xFF,
+                                   0xC0,
+                                   0,
+                                   0x11,
+                                   8,
+                                   (unsigned char)(height >> 8),
+                                   STBIW_UCHAR(height),
+                                   (unsigned char)(width >> 8),
+                                   STBIW_UCHAR(width),
+                                   3,
+                                   1,
+                                   (unsigned char)(subsample ? 0x22 : 0x11),
+                                   0,
+                                   2,
+                                   0x11,
+                                   1,
+                                   3,
+                                   0x11,
+                                   1,
+                                   0xFF,
+                                   0xC4,
+                                   0x01,
+                                   0xA2,
+                                   0};
+    s->func(s->context, (void *)head0, sizeof(head0));
+    s->func(s->context, (void *)YTable, sizeof(YTable));
+    stbiw__putc(s, 1);
+    s->func(s->context, UVTable, sizeof(UVTable));
+    s->func(s->context, (void *)head1, sizeof(head1));
+    s->func(s->context, (void *)(std_dc_luminance_nrcodes + 1),
+            sizeof(std_dc_luminance_nrcodes) - 1);
+    s->func(s->context, (void *)std_dc_luminance_values,
+            sizeof(std_dc_luminance_values));
+    stbiw__putc(s, 0x10); // HTYACinfo
+    s->func(s->context, (void *)(std_ac_luminance_nrcodes + 1),
+            sizeof(std_ac_luminance_nrcodes) - 1);
+    s->func(s->context, (void *)std_ac_luminance_values,
+            sizeof(std_ac_luminance_values));
+    stbiw__putc(s, 1); // HTUDCinfo
+    s->func(s->context, (void *)(std_dc_chrominance_nrcodes + 1),
+            sizeof(std_dc_chrominance_nrcodes) - 1);
+    s->func(s->context, (void *)std_dc_chrominance_values,
+            sizeof(std_dc_chrominance_values));
+    stbiw__putc(s, 0x11); // HTUACinfo
+    s->func(s->context, (void *)(std_ac_chrominance_nrcodes + 1),
+            sizeof(std_ac_chrominance_nrcodes) - 1);
+    s->func(s->context, (void *)std_ac_chrominance_values,
+            sizeof(std_ac_chrominance_values));
+    s->func(s->context, (void *)head2, sizeof(head2));
+  }
+
+  // Encode 8x8 macroblocks
+  {
+    static const unsigned short fillBits[] = {0x7F, 7};
+    int DCY = 0, DCU = 0, DCV = 0;
+    int bitBuf = 0, bitCnt = 0;
+    // comp == 2 is grey+alpha (alpha is ignored)
+    int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0;
+    const unsigned char *dataR = (const unsigned char *)data;
+    const unsigned char *dataG = dataR + ofsG;
+    const unsigned char *dataB = dataR + ofsB;
+    int x, y, pos;
+    if (subsample) {
+      for (y = 0; y < height; y += 16) {
+        for (x = 0; x < width; x += 16) {
+          float Y[256], U[256], V[256];
+          for (row = y, pos = 0; row < y + 16; ++row) {
+            // row >= height => use last input row
+            int clamped_row = (row < height) ? row : height - 1;
+            int base_p =
+                (stbi__flip_vertically_on_write ? (height - 1 - clamped_row)
+                                                : clamped_row) *
+                width * comp;
+            for (col = x; col < x + 16; ++col, ++pos) {
+              // if col >= width => use pixel from last input column
+              int p = base_p + ((col < width) ? col : (width - 1)) * comp;
+              float r = dataR[p], g = dataG[p], b = dataB[p];
+              Y[pos] = +0.29900f * r + 0.58700f * g + 0.11400f * b - 128;
+              U[pos] = -0.16874f * r - 0.33126f * g + 0.50000f * b;
+              V[pos] = +0.50000f * r - 0.41869f * g - 0.08131f * b;
+            }
+          }
+          DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 0, 16, fdtbl_Y,
+                                     DCY, YDC_HT, YAC_HT);
+          DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 8, 16, fdtbl_Y,
+                                     DCY, YDC_HT, YAC_HT);
+          DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 128, 16, fdtbl_Y,
+                                     DCY, YDC_HT, YAC_HT);
+          DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 136, 16, fdtbl_Y,
+                                     DCY, YDC_HT, YAC_HT);
+
+          // subsample U,V
+          {
+            float subU[64], subV[64];
+            int yy, xx;
+            for (yy = 0, pos = 0; yy < 8; ++yy) {
+              for (xx = 0; xx < 8; ++xx, ++pos) {
+                int j = yy * 32 + xx * 2;
+                subU[pos] =
+                    (U[j + 0] + U[j + 1] + U[j + 16] + U[j + 17]) * 0.25f;
+                subV[pos] =
+                    (V[j + 0] + V[j + 1] + V[j + 16] + V[j + 17]) * 0.25f;
+              }
+            }
+            DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subU, 8, fdtbl_UV,
+                                       DCU, UVDC_HT, UVAC_HT);
+            DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subV, 8, fdtbl_UV,
+                                       DCV, UVDC_HT, UVAC_HT);
+          }
+        }
+      }
+    } else {
+      for (y = 0; y < height; y += 8) {
+        for (x = 0; x < width; x += 8) {
+          float Y[64], U[64], V[64];
+          for (row = y, pos = 0; row < y + 8; ++row) {
+            // row >= height => use last input row
+            int clamped_row = (row < height) ? row : height - 1;
+            int base_p =
+                (stbi__flip_vertically_on_write ? (height - 1 - clamped_row)
+                                                : clamped_row) *
+                width * comp;
+            for (col = x; col < x + 8; ++col, ++pos) {
+              // if col >= width => use pixel from last input column
+              int p = base_p + ((col < width) ? col : (width - 1)) * comp;
+              float r = dataR[p], g = dataG[p], b = dataB[p];
+              Y[pos] = +0.29900f * r + 0.58700f * g + 0.11400f * b - 128;
+              U[pos] = -0.16874f * r - 0.33126f * g + 0.50000f * b;
+              V[pos] = +0.50000f * r - 0.41869f * g - 0.08131f * b;
+            }
+          }
+
+          DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y, 8, fdtbl_Y, DCY,
+                                     YDC_HT, YAC_HT);
+          DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, U, 8, fdtbl_UV, DCU,
+                                     UVDC_HT, UVAC_HT);
+          DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, V, 8, fdtbl_UV, DCV,
+                                     UVDC_HT, UVAC_HT);
+        }
+      }
+    }
+
+    // Do the bit alignment of the EOI marker
+    stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits);
+  }
+
+  // EOI
+  stbiw__putc(s, 0xFF);
+  stbiw__putc(s, 0xD9);
+
+  return 1;
+}
+
+STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x,
+                                    int y, int comp, const void *data,
+                                    int quality) {
+  stbi__write_context s = {0};
+  stbi__start_write_callbacks(&s, func, context);
+  return stbi_write_jpg_core(&s, x, y, comp, (void *)data, quality);
+}
+
+#ifndef STBI_WRITE_NO_STDIO
+STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp,
+                            const void *data, int quality) {
+  stbi__write_context s = {0};
+  if (stbi__start_write_file(&s, filename)) {
+    int r = stbi_write_jpg_core(&s, x, y, comp, data, quality);
+    stbi__end_write_file(&s);
+    return r;
+  } else
+    return 0;
+}
+#endif
+
+#endif // STB_IMAGE_WRITE_IMPLEMENTATION
+
+/* Revision history
+          1.16  (2021-07-11)
+                         make Deflate code emit uncompressed blocks when it
+   would otherwise expand support writing BMPs with alpha channel 1.15
+   (2020-07-13) unknown 1.14  (2020-02-02) updated JPEG writer to downsample
+   chroma channels 1.13 1.12 1.11  (2019-08-11)
+
+          1.10  (2019-02-07)
+                         support utf8 filenames in Windows; fix warnings and
+   platform ifdefs 1.09  (2018-02-11) fix typo in zlib quality API, improve
+   STB_I_W_STATIC in C++ 1.08  (2018-01-29) add stbi__flip_vertically_on_write,
+   external zlib, zlib quality, choose PNG filter 1.07  (2017-07-24) doc fix
+          1.06 (2017-07-23)
+                         writing JPEG (using Jon Olick's code)
+          1.05   ???
+          1.04 (2017-03-03)
+                         monochrome BMP expansion
+          1.03   ???
+          1.02 (2016-04-02)
+                         avoid allocating large structures on the stack
+          1.01 (2016-01-16)
+                         STBIW_REALLOC_SIZED: support allocators with no realloc
+   support avoid race-condition in crc initialization minor compile issues 1.00
+   (2015-09-14) installable file IO function 0.99 (2015-09-13) warning fixes;
+   TGA rle support 0.98 (2015-04-08) added STBIW_MALLOC, STBIW_ASSERT etc 0.97
+   (2015-01-18) fixed HDR asserts, rewrote HDR rle logic 0.96 (2015-01-17) add
+   HDR output fix monochrome BMP 0.95 (2014-08-17) add monochrome TGA output
+          0.94 (2014-05-31)
+                         rename private functions to avoid conflicts with
+   stb_image.h 0.93 (2014-05-27) warning fixes 0.92 (2010-08-01) casts to
+   unsigned char to fix warnings 0.91 (2010-07-17) first public release 0.90
+   first internal release
+*/
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/