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Change Background Image for games (#2334)

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* Added opacity change instead of blur for background image

* Fixed integer overflow when refreshing grid list

* Added slider to control background image opacity

* Added show background image button

* Added UI code for checkbox and English and Spanish translations for new UI elements

* Removed background image caching

* Background image update on apply/save

* Only recompute image if opacity or game changes

* Fixed segfault when trying to change opacity after table refresh

* Placed background image settings under GUI in settings file
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pdaloxd 2025-02-04 08:33:38 +01:00 • committed by GitHub
parent 363604c6f0
commit b6ad512e34
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13 changed files with 279 additions and 56 deletions
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26
src/qt_gui/game_list_utils.h
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@ -201,4 +201,30 @@ public:
return result;
}
// Opacity is a float between 0 and 1
static QImage ChangeImageOpacity(const QImage& image, const QRect& rect, float opacity) {
// Convert to ARGB32 format to ensure alpha channel support
QImage result = image.convertToFormat(QImage::Format_ARGB32);
// Ensure opacity is between 0 and 1
opacity = std::clamp(opacity, 0.0f, 1.0f);
// Convert opacity to integer alpha value (0-255)
int alpha = static_cast<int>(opacity * 255);
// Process only the specified rectangle area
for (int y = rect.top(); y <= rect.bottom(); ++y) {
QRgb* line = reinterpret_cast<QRgb*>(result.scanLine(y));
for (int x = rect.left(); x <= rect.right(); ++x) {
// Get current pixel
QRgb pixel = line[x];
// Keep RGB values, but modify alpha while preserving relative transparency
int newAlpha = (qAlpha(pixel) * alpha) / 255;
line[x] = qRgba(qRed(pixel), qGreen(pixel), qBlue(pixel), newAlpha);
}
}
return result;
}
};