fix(footer): skip background blur when using default cover image

.reuse/dep5

@@ -8,6 +8,11 @@ Files: .github/*
 Copyright: None
 License: CC0-1.0
 
+# config
+Files: config.h.in
+Copyright: None
+License: CC0-1.0
+
 # gitignore
 Files: .gitignore 
 Copyright: None

src/music-player/mainFrame/footerwidget.cpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2020 ~ 2021 Uniontech Software Technology Co., Ltd.
+// Copyright (C) 2020 ~ 2026 Uniontech Software Technology Co., Ltd.
 // SPDX-FileCopyrightText: 2022 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
@@ -15,12 +15,13 @@
 #include <QDBusReply>
 #include <QGSettings>
 #include <QFrame>
 #include <QShortcut>
 #include <QFileInfo>
 #include <QTimer>
+#include <QDir>
 
 #include <DHiDPIHelper>
 #include <DPushButton>
 #include <DProgressBar>
 #include <DFloatingWidget>
 #include <DPalette>
@@ -927,13 +928,35 @@
 
 void FooterWidget::slotFlushBackground()
 {
-    QImage cover = QImage(":/icons/deepin/builtin/actions/info_cover_142px.svg");
-    QString imagesDirPath = Global::cacheDir() + "/images/" + Player::getInstance()->getActiveMeta().hash + ".jpg";
+    auto clearBackground = [this]() {
+        m_forwardWidget->setSourceImage(QImage());
+        m_forwardWidget->update();
+    };
+
+    QString cacheDir = Global::cacheDir();
+    if (cacheDir.isEmpty()) {
+        qWarning() << "Cache directory is invalid, clearing background";
+        clearBackground();
+        return;
+    }
+
+    QString imagesDirPath = QDir(cacheDir).filePath(
+        QString("images/%1.jpg").arg(Player::getInstance()->getActiveMeta().hash)
+    );
+
     QFileInfo file(imagesDirPath);
-    if (file.exists()) {
-        cover = QImage(Global::cacheDir() + "/images/" + Player::getInstance()->getActiveMeta().hash + ".jpg");
+    if (!file.exists()) {
+        clearBackground();
+        return;
     }
-
+
+    QImage cover(imagesDirPath);
+    if (cover.isNull() || cover.size().isEmpty()) {
+        qWarning() << "Failed to load cover image or invalid size:" << imagesDirPath;
+        clearBackground();
+        return;
+    }
+
     double windowScale = (width() * 1.0) / height();
     int imageWidth = static_cast<int>(cover.height() * windowScale);
     QImage coverImage;