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WebP: Add test for vertical ALPH chunk filtering_method

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This commit is contained in:
Nico Weber 2023-06-08 18:28:11 -04:00 • committed by Tim Flynn
parent a77b6c470a
commit 52d17afd7e
2 changed files with 24 additions and 1 deletions
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24
Tests/LibGfx/TestImageDecoder.cpp
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@ -404,6 +404,30 @@ TEST_CASE(test_webp_extended_lossy_alpha_horizontal_filter)
EXPECT_EQ(frame.image->get_pixel(131, 131), Gfx::Color(0x8f, 0x51, 0x2f, 0x4b));
}
TEST_CASE(test_webp_extended_lossy_alpha_vertical_filter)
{
// Also lossy rgb + lossless alpha, but with a vertical alpha filtering method.
// The image should look like smolkling.webp, but with a vertical alpha gradient, and with a fully transparent first column.
auto file = MUST(Core::MappedFile::map(TEST_INPUT("smolkling-vertical-alpha.webp"sv)));
EXPECT(Gfx::WebPImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = MUST(Gfx::WebPImageDecoderPlugin::create(file->bytes()));
MUST(plugin_decoder->initialize());
EXPECT_EQ(plugin_decoder->frame_count(), 1u);
EXPECT(!plugin_decoder->is_animated());
EXPECT(!plugin_decoder->loop_count());
EXPECT_EQ(plugin_decoder->size(), Gfx::IntSize(264, 264));
auto frame = MUST(plugin_decoder->frame(0));
EXPECT_EQ(frame.image->size(), Gfx::IntSize(264, 264));
// While VP8 YUV contents are defined bit-exact, the YUV->RGB conversion isn't.
// So pixels changing by 1 or so below is fine if you change code.
// The important component in this test is alpha, and that shouldn't change even by 1 as it's losslessly compressed and doesn't use YUV.
EXPECT_EQ(frame.image->get_pixel(131, 131), Gfx::Color(0x94, 0x50, 0x32, 0x4c));
}
TEST_CASE(test_webp_extended_lossy_alpha_gradient_filter)
{
// Also lossy rgb + lossless alpha, but with a gradient alpha filtering method.