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Tests: Add test for color indexing for single-channel images

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The color indexing transform shouldn't make single-channel images
larger (by needlessly writing a palette). If there <= 16 colors
in the single channel, it should make the image smaller.
This commit is contained in:
Nico Weber 2024-05-31 21:07:05 -04:00 committed by Tim Schumacher
parent 347e2831b2
commit 3ca6dfba48
Notes: sideshowbarker 2024-07-16 17:12:03 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/3ca6dfba48
Pull-request: https://github.com/SerenityOS/serenity/pull/24503
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/timschumi ✅
1 changed files with 33 additions and 0 deletions
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33
Tests/LibGfx/TestImageWriter.cpp
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@ -216,6 +216,39 @@ TEST_CASE(test_webp_color_indexing_transform)
}
}
TEST_CASE(test_webp_color_indexing_transform_single_channel)
{
Array<Color, 256> colors;
for (size_t i = 0; i < colors.size(); ++i) {
colors[i].set_red(0);
colors[i].set_green(255 - i);
colors[i].set_blue(128);
colors[i].set_alpha(255);
}
for (int bits_per_pixel : { 1, 2, 4, 8 }) {
int number_of_colors = 1 << bits_per_pixel;
auto bitmap = TRY_OR_FAIL(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, { 47, 33 }));
for (int y = 0; y < bitmap->height(); ++y)
for (int x = 0; x < bitmap->width(); ++x)
bitmap->set_pixel(x, y, colors[(x * bitmap->width() + y) % number_of_colors]);
auto encoded_data = TRY_OR_FAIL(encode_bitmap<Gfx::WebPWriter>(bitmap));
auto decoded_bitmap = TRY_OR_FAIL(expect_single_frame_of_size(*TRY_OR_FAIL(Gfx::WebPImageDecoderPlugin::create(encoded_data)), bitmap->size()));
expect_bitmaps_equal(*decoded_bitmap, *bitmap);
Gfx::WebPEncoderOptions options;
options.vp8l_options.allowed_transforms = 0;
auto encoded_data_without_color_indexing = TRY_OR_FAIL(encode_bitmap<Gfx::WebPWriter>(bitmap, options));
if (bits_per_pixel == 8)
EXPECT(encoded_data.size() <= encoded_data_without_color_indexing.size());
else
EXPECT(encoded_data.size() < encoded_data_without_color_indexing.size());
auto decoded_bitmap_without_color_indexing = TRY_OR_FAIL(expect_single_frame_of_size(*TRY_OR_FAIL(Gfx::WebPImageDecoderPlugin::create(encoded_data)), bitmap->size()));
expect_bitmaps_equal(*decoded_bitmap_without_color_indexing, *decoded_bitmap);
}
}
TEST_CASE(test_webp_icc)
{
auto sRGB_icc_profile = MUST(Gfx::ICC::sRGB());