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LibGfx: use disposal method of previous frame in GIF transparency

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The disposal method on a GIF animation frame now correctly applies to
rendering of the next frame.
This commit is contained in:
Peter Nelson 2020-08-12 18:42:13 +01:00 committed by Andreas Kling
parent daa762bb06
commit c8f8f4e6c3
1 changed files with 9 additions and 3 deletions
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12
Libraries/LibGfx/GIFLoader.cpp
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@ -282,13 +282,19 @@ static bool decode_frames_up_to_index(GIFLoadingContext& context, size_t frame_i
Color background_color = Color(background_rgb.r, background_rgb.g, background_rgb.b);
image.bitmap = Bitmap::create_purgeable(BitmapFormat::RGBA32, { context.logical_screen.width, context.logical_screen.height });
image.bitmap->fill(background_color);
if (i > 0 && image.disposal_method == ImageDescriptor::DisposalMethod::InPlace) {
const auto previous_image_disposal_method = i > 0 ? context.images.at(i - 1).disposal_method : ImageDescriptor::DisposalMethod::None;
if (previous_image_disposal_method == ImageDescriptor::DisposalMethod::InPlace) {
for (int y = 0; y < image.bitmap->height(); ++y) {
for (int x = 0; x < image.bitmap->width(); ++x) {
image.bitmap->set_pixel(x, y, context.images.at(i - 1).bitmap->get_pixel(x, y));
}
}
} else if (previous_image_disposal_method == ImageDescriptor::DisposalMethod::RestoreBackground) {
image.bitmap->fill(background_color);
} else if (previous_image_disposal_method == ImageDescriptor::DisposalMethod::RestorePrevious) {
image.bitmap->fill(Color(Color::NamedColor::Transparent));
}
int pixel_index = 0;
@ -320,7 +326,7 @@ static bool decode_frames_up_to_index(GIFLoadingContext& context, size_t frame_i
c.set_alpha(0);
}
if (!image.transparent || image.disposal_method == ImageDescriptor::DisposalMethod::None || color != image.transparency_index) {
if (!image.transparent || previous_image_disposal_method == ImageDescriptor::DisposalMethod::None || color != image.transparency_index) {
image.bitmap->set_pixel(x, y, c);
}