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WebP: Add test for gradient ALPH chunk filtering_method

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Nico Weber 2023-06-08 17:55:39 -04:00 committed by Tim Flynn
parent ec7eb78841
commit b0916d2133
1 changed files with 25 additions and 0 deletions
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25
Tests/LibGfx/TestImageDecoder.cpp
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@ -404,6 +404,31 @@ 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_gradient_filter)
{
// Also lossy rgb + lossless alpha, but with a gradient alpha filtering method.
// The image should look like smolkling.webp, but with a few transparent pixels in the shape of a C on it. Most of the image should not be transparent.
auto file = MUST(Core::MappedFile::map(TEST_INPUT("smolkling-gradient-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.
// In particular, the center of the image should be fully opaque, not fully transparent.
EXPECT_EQ(frame.image->get_pixel(131, 131), Gfx::Color(0x8c, 0x47, 0x2e, 255));
}
TEST_CASE(test_webp_extended_lossy_uncompressed_alpha)
{
auto file = MUST(Core::MappedFile::map(TEST_INPUT("extended-lossy-uncompressed-alpha.webp"sv)));