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Tests: Add test for webp with color index transform and alpha_used=false

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This just works at the moment after e19892a099, but if we ever do
the FIXME in ColorIndexingTransform::transform(), this test will
remind us to think of this case there too.

catdog-alert-13-alpha-used-false.webp is identical to
catdog-alert-13.web but with the byte at offset 0x2a changed from
0x10 to 0x00  -- that is, the bit in the VP8L header that stores
`is_alpha_used` is cleared.

See the commit message of e19892a099 for more information.
This commit is contained in:
Nico Weber 2023-06-19 21:07:17 -04:00 • committed by Andreas Kling
parent 9f24c1b34c
commit da48238fbd
2 changed files with 3 additions and 0 deletions
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3
Tests/LibGfx/TestImageDecoder.cpp
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@ -492,11 +492,14 @@ TEST_CASE(test_webp_simple_lossless_color_index_transform_pixel_bundling)
// 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.
// catdog-alert-13-alpha-used-false is like catdog-alert-13, but with is_alpha_used set to false in the header
// (which has the effect of ignoring the alpha information in the palette and instead always setting alpha to 0xff).
TestCase test_cases[] = {
{ "webp/catdog-alert-2.webp"sv, Gfx::Color(0x35, 0x12, 0x0a, 0xff), Gfx::Color(0xf3, 0xe6, 0xd8, 0xff) },
{ "webp/catdog-alert-3.webp"sv, Gfx::Color(0x35, 0x12, 0x0a, 0xff), Gfx::Color(0, 0, 0, 0) },
{ "webp/catdog-alert-8.webp"sv, Gfx::Color(0, 0, 0, 255), Gfx::Color(0, 0, 0, 0) },
{ "webp/catdog-alert-13.webp"sv, Gfx::Color(0, 0, 0, 255), Gfx::Color(0, 0, 0, 0) },
{ "webp/catdog-alert-13-alpha-used-false.webp"sv, Gfx::Color(0, 0, 0, 255), Gfx::Color(0, 0, 0, 255) },
};
for (auto test_case : test_cases) {