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LibGfx/JPEGXL: Accept images with high bit depth

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Instead of rejecting them, we truncate each value to 8 bits. This is
clearly a hack, but given the lack of support of variable bit-depth in
`Bitmap` this is the only sensible change.

This allows us to display "Iceberg" on https://jpegxl.info/art/.
This commit is contained in:
Lucas CHOLLET 2023-06-24 14:38:02 -04:00 committed by Tim Flynn
parent 6710622bf7
commit 65565d377b
Notes: sideshowbarker 2024-07-17 05:58:46 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/65565d377b
Pull-request: https://github.com/SerenityOS/serenity/pull/20131
1 changed files with 7 additions and 2 deletions
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9
Userland/Libraries/LibGfx/ImageFormats/JPEGXLLoader.cpp
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@ -1081,11 +1081,16 @@ public:
auto bitmap = TRY(Bitmap::create(BitmapFormat::BGRx8888, { width, height }));
// FIXME: This assumes a raw image with RGB channels, other cases are possible
VERIFY(bits_per_sample == 8);
VERIFY(bits_per_sample >= 8);
for (u32 y {}; y < height; ++y) {
for (u32 x {}; x < width; ++x) {
auto const to_u8 = [&, bits_per_sample](i32 sample) -> u8 {
return clamp(sample + .5, 0, (1 << bits_per_sample) - 1);
// FIXME: Don't truncate the result to 8 bits
static constexpr auto maximum_supported_bit_depth = 8;
if (bits_per_sample > maximum_supported_bit_depth)
sample >>= (bits_per_sample - maximum_supported_bit_depth);
return clamp(sample + .5, 0, (1 << maximum_supported_bit_depth) - 1);
};
Color const color {