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LibGfx/ILBMLoader: Properly display images with a bitplane mask

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Images with a display mask ("stencil" as it's called in DPaint) add
an extra bitplane which acts as a mask. For now, at least skip it
properly. Later we should render masked pixels as transparent, but
this requires some refactoring.
This commit is contained in:
Nicolas Ramz 2024-01-16 15:29:44 +01:00 • committed by Andreas Kling
parent 45181e8eaf
commit 534eeb6c4b
3 changed files with 21 additions and 5 deletions
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11
Tests/LibGfx/TestImageDecoder.cpp
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@ -265,6 +265,17 @@ TEST_CASE(test_small_24bit)
EXPECT_EQ(frame.image->get_pixel(0, 4), Gfx::Color(1, 0, 1, 255));
}
TEST_CASE(test_stencil_mask)
{
auto file = TRY_OR_FAIL(Core::MappedFile::map(TEST_INPUT("ilbm/test-stencil.iff"sv)));
EXPECT(Gfx::ILBMImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = TRY_OR_FAIL(Gfx::ILBMImageDecoderPlugin::create(file->bytes()));
auto frame = TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 320, 200 }));
EXPECT_EQ(frame.image->get_pixel(0, 4), Gfx::Color(0, 0, 0, 255));
}
TEST_CASE(test_ilbm_malformed_header)
{
Array test_inputs = {