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LibGfx/JPEGXL: Fix property 8

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The first implementation of this property was just plain wrong. Looks
like this property isn't used a lot as I found the issue by reviewing
the code and not because of a specific image.

The test image is a 32x32 mosaic of alternating black and yellow pixels,
it was generated using this code:

Bitdepth 8
RCT 1
Width 32
Height 32

if W-WW-NW+NWW > -300
 - Set -1000
 - Set 900
This commit is contained in:
Lucas CHOLLET 2023-07-31 16:56:12 -04:00 committed by Andreas Kling
parent 6b41fef2e4
commit 00240cb0b3
Notes: sideshowbarker 2024-07-16 21:51:02 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/00240cb0b3
Pull-request: https://github.com/SerenityOS/serenity/pull/20289
Reviewed-by: https://github.com/nico ✅
3 changed files with 29 additions and 6 deletions
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20
Tests/LibGfx/TestImageDecoder.cpp
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@ -574,3 +574,23 @@ TEST_CASE(test_jxl_modular_simple_tree_upsample2_10bits)
auto frame = MUST(plugin_decoder->frame(0));
EXPECT_EQ(frame.image->get_pixel(42, 57), Gfx::Color::from_string("#4c0072"sv));
}
TEST_CASE(test_jxl_modular_property_8)
{
auto file = MUST(Core::MappedFile::map(TEST_INPUT("jxl/modular_property_8.jxl"sv)));
EXPECT(Gfx::JPEGXLImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = MUST(Gfx::JPEGXLImageDecoderPlugin::create(file->bytes()));
expect_single_frame_of_size(*plugin_decoder, { 32, 32 });
auto frame = MUST(plugin_decoder->frame(0));
for (u8 i = 0; i < 32; ++i) {
for (u8 j = 0; j < 32; ++j) {
auto const color = frame.image->get_pixel(i, j);
if ((i + j) % 2 == 0)
EXPECT_EQ(color, Gfx::Color::Black);
else
EXPECT_EQ(color, Gfx::Color::Yellow);
}
}
}

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Tests/LibGfx/test-inputs/jxl/modular_property_8.jxl Normal file
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15
Userland/Libraries/LibGfx/ImageFormats/JPEGXLLoader.cpp
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@ -1303,12 +1303,15 @@ static ErrorOr<Vector<i32>> get_properties(Vector<Channel> const& channels, u16
TRY(properties.try_append(W));
// x > 0 ? W - /* (the value of property 9 at position (x - 1, y)) */ : W
i32 x_1 = x - 1;
i32 const W_x_1 = x_1 > 0 ? channels[i].get(x_1 - 1, y) : (x_1 >= 0 && y > 0 ? channels[i].get(x_1, y - 1) : 0);
i32 const N_x_1 = x_1 >= 0 && y > 0 ? channels[i].get(x_1, y - 1) : W_x_1;
i32 const NW_x_1 = x_1 > 0 && y > 0 ? channels[i].get(x_1 - 1, y - 1) : W_x_1;
TRY(properties.try_append(W_x_1 + N_x_1 - NW_x_1));
if (x > 0) {
auto const x_1 = x - 1;
i32 const W_x_1 = x_1 > 0 ? channels[i].get(x_1 - 1, y) : (y > 0 ? channels[i].get(x_1, y - 1) : 0);
i32 const N_x_1 = y > 0 ? channels[i].get(x_1, y - 1) : W_x_1;
i32 const NW_x_1 = x_1 > 0 && y > 0 ? channels[i].get(x_1 - 1, y - 1) : W_x_1;
TRY(properties.try_append(W - (W_x_1 + N_x_1 - NW_x_1)));
} else {
TRY(properties.try_append(W));
}
TRY(properties.try_append(W + N - NW));
TRY(properties.try_append(W - NW));