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LibGfx: Fix AVIF alpha type to be unpremultiplied

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libavif outputs straight (unpremultiplied) alpha by default, but the
AVIF loader was creating bitmaps without specifying an alpha type,
which defaults to premultiplied. This mismatch caused semi-transparent
pixels to render incorrectly.

Pass AlphaType::Unpremultiplied explicitly, matching what the PNG,
WebP, and BMP decoders already do.
This commit is contained in:
Andreas Kling 2026-03-27 18:29:15 +01:00 committed by Andreas Kling
parent ed6a5f25a0
commit 815f5e7d79
1 changed files with 1 additions and 1 deletions
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Libraries/LibGfx/ImageFormats/AVIFLoader.cpp
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@ -105,7 +105,7 @@ static ErrorOr<void> decode_avif_image(AVIFLoadingContext& context)
avifRGBImage rgb;
while (avifDecoderNextImage(context.decoder) == AVIF_RESULT_OK) {
auto bitmap_format = context.has_alpha ? BitmapFormat::BGRA8888 : BitmapFormat::BGRx8888;
auto bitmap = TRY(Bitmap::create(bitmap_format, context.size.value()));
auto bitmap = TRY(Bitmap::create(bitmap_format, AlphaType::Unpremultiplied, context.size.value()));
avifRGBImageSetDefaults(&rgb, context.decoder->image);
rgb.pixels = bitmap->scanline_u8(0);