add gdimage output

[nadenislamarre]

Signed-off-by: Nicolas Adenis-Lamarre nicolas.adenis.lamarre@gmail.com

[nadenislamarre]

maybe the qrPngLogo could be added somewhere too ?
the idea is to produce image with logo.

?php
require_once("phpqrcode/qrlib.php");

//$QR = QRcode::png($_GET["url"], false, QR_ECLEVEL_H, 20, 1, true);
//exit(0);

qrPngLogo($_GET["url"], "logo.jpg", QR_ECLEVEL_H, 20, 1, 4, true);

function qrPngLogo($text, $logopath, $level, $size, $margin, $logo_ratio, $print = false) {
$QR = QRcode::gdimage($text, $level, $size, $margin);

if( ($data = file_get_contents($logopath)) === false)
throw new Exception("unable to read logo");

if( ($logo = imagecreatefromstring($data)) === false)
throw new Exception("unable to read logo");

$QR_width = imagesx($QR);
$QR_height = imagesy($QR);
$logo_width = imagesx($logo);
$logo_height = imagesy($logo);
if($QR_width === false || $QR_height === false || $logo_width === false || $logo_height === false)
throw new Exception("unable to read image size");

$logo_qr_width = $QR_width/$logo_ratio;
$scale = $logo_width/$logo_qr_width;
$logo_qr_height = $logo_height/$scale;

if(imagecopyresampled($QR, $logo, $QR_width/2-$logo_qr_width/2, $QR_height/2-$logo_qr_height/2, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height) === false)
throw new Exception("unable to write the logo");
ImageDestroy($logo);

if($print) {
header ('Content-Type: image/png');
imagepng($QR);
ImageDestroy($QR);
} else {
return $QR;
}
}
?