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Tests: Add webp lossless test with color index and < 16 colors

For the test files, I opened Base/res/icons/catdog/alert.png in Adobe
Photoshop 2023, used Image->Mode->Index Color...->
Palette: Local (Perceptive) to reduce the number of colors to 13, 8, and
3 with transparency, and 2 without transparency, then converted it back
to Image->Mode->RGB Color (else it can't be saved as webp), then
File->Save a Copy... to save a WebP (mode lossless) for every palette
size.
This commit is contained in:
Nico Weber 2023-04-07 18:40:28 -04:00 committed by Linus Groh
parent 1dab480015
commit f2efb97578
5 changed files with 40 additions and 0 deletions

View file

@ -380,6 +380,46 @@ TEST_CASE(test_webp_simple_lossless_color_index_transform)
EXPECT_EQ(frame.image->get_pixel(100, 100), Gfx::Color(0x73, 0x37, 0x23, 0xff));
}
TEST_CASE(test_webp_simple_lossless_color_index_transform_pixel_bundling)
{
struct TestCase {
StringView file_name;
Gfx::Color line_color;
Gfx::Color background_color;
};
// The number after the dash is the number of colors in each file's color index bitmap.
// catdog-alert-2 tests the 1-bit-per-pixel case,
// catdog-alert-3 tests the 2-bit-per-pixel case,
// catdog-alert-8 and catdog-alert-13 both test the 4-bits-per-pixel case.
TestCase test_cases[] = {
{ "catdog-alert-2.webp"sv, Gfx::Color(0x35, 0x12, 0x0a, 0xff), Gfx::Color(0xf3, 0xe6, 0xd8, 0xff) },
{ "catdog-alert-3.webp"sv, Gfx::Color(0x35, 0x12, 0x0a, 0xff), Gfx::Color(0, 0, 0, 0) },
{ "catdog-alert-8.webp"sv, Gfx::Color(0, 0, 0, 255), Gfx::Color(0, 0, 0, 0) },
{ "catdog-alert-13.webp"sv, Gfx::Color(0, 0, 0, 255), Gfx::Color(0, 0, 0, 0) },
};
for (auto test_case : test_cases) {
auto file = MUST(Core::MappedFile::map(MUST(String::formatted("{}{}", TEST_INPUT(""), test_case.file_name))));
EXPECT(Gfx::WebPImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = MUST(Gfx::WebPImageDecoderPlugin::create(file->bytes()));
EXPECT(plugin_decoder->initialize());
EXPECT_EQ(plugin_decoder->frame_count(), 1u);
EXPECT_EQ(plugin_decoder->size(), Gfx::IntSize(32, 32));
auto frame = MUST(plugin_decoder->frame(0));
EXPECT_EQ(frame.image->size(), Gfx::IntSize(32, 32));
EXPECT_EQ(frame.image->get_pixel(4, 0), test_case.background_color);
EXPECT_EQ(frame.image->get_pixel(5, 0), test_case.line_color);
EXPECT_EQ(frame.image->get_pixel(9, 5), test_case.background_color);
EXPECT_EQ(frame.image->get_pixel(10, 5), test_case.line_color);
EXPECT_EQ(frame.image->get_pixel(11, 5), test_case.background_color);
}
}
TEST_CASE(test_webp_extended_lossless_animated)
{
auto file = MUST(Core::MappedFile::map(TEST_INPUT("extended-lossless-animated.webp"sv)));

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