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LibGfx: Fix color alfa for transparent color in GIFLoader

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Hüseyin ASLITÜRK 2020-06-17 21:48:15 +03:00 • committed by Andreas Kling
parent ccb0d00020
commit 49c801f7fd
1 changed files with 17 additions and 7 deletions
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16
Libraries/LibGfx/GIFLoader.cpp
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@ -294,6 +294,11 @@ bool decode_frames_up_to_index(GIFLoadingContext& context, size_t frame_index)
} }
int pixel_index = 0; int pixel_index = 0;
RGB transparent_color { 0, 0, 0 };
if (image.transparent) {
transparent_color = context.logical_screen.color_map[image.transparency_index];
}
while (true) { while (true) {
Optional<u16> code = decoder.next_code(); Optional<u16> code = decoder.next_code();
if (!code.has_value()) { if (!code.has_value()) {
@ -311,15 +316,20 @@ bool decode_frames_up_to_index(GIFLoadingContext& context, size_t frame_index)
auto colors = decoder.get_output(); auto colors = decoder.get_output();
for (const auto& color : colors) { for (const auto& color : colors) {
if (!image.transparent || color != image.transparency_index) {
auto rgb = context.logical_screen.color_map[color]; auto rgb = context.logical_screen.color_map[color];
int x = pixel_index % image.width + image.x; int x = pixel_index % image.width + image.x;
int y = pixel_index / image.width + image.y; int y = pixel_index / image.width + image.y;
Color c = Color(rgb.r, rgb.g, rgb.b); Color c = Color(rgb.r, rgb.g, rgb.b);
image.bitmap->set_pixel(x, y, c);
if (image.transparent) {
if (rgb.r == transparent_color.r && rgb.g == transparent_color.g && rgb.b == transparent_color.b) {
c.set_alpha(0);
} }
}
image.bitmap->set_pixel(x, y, c);
++pixel_index; ++pixel_index;
} }
} }
@ -536,7 +546,7 @@ GIFImageDecoderPlugin::GIFImageDecoderPlugin(const u8* data, size_t size)
m_context->data_size = size; m_context->data_size = size;
} }
GIFImageDecoderPlugin::~GIFImageDecoderPlugin() { } GIFImageDecoderPlugin::~GIFImageDecoderPlugin() {}
IntSize GIFImageDecoderPlugin::size() IntSize GIFImageDecoderPlugin::size()
{ {