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LibGfx/TIFF: Add support for RGBPalette images

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TIFF images with the PhotometricInterpretation tag set to RGBPalette are
based on indexed colors instead of explicitly describing the color for
each pixel. Let's add support for them.

The test case was generated with GIMP using the Indexed image mode after
adding an alpha layer. Not all decoders are able to open this image, but
GIMP can.
This commit is contained in:
Lucas CHOLLET 2023-12-17 23:35:21 -05:00 • committed by Andreas Kling
parent d8759d9656
commit 67522fab2e
4 changed files with 37 additions and 0 deletions
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12
Tests/LibGfx/TestImageDecoder.cpp
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@ -489,6 +489,18 @@ TEST_CASE(test_tiff_rgb_alpha)
EXPECT_EQ(frame.image->get_pixel(60, 75), Gfx::Color::NamedColor::Red);
}
TEST_CASE(test_tiff_palette_alpha)
{
auto file = MUST(Core::MappedFile::map(TEST_INPUT("tiff/rgb_palette_alpha.tiff"sv)));
EXPECT(Gfx::TIFFImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = TRY_OR_FAIL(Gfx::TIFFImageDecoderPlugin::create(file->bytes()));
auto frame = TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 400, 300 }));
EXPECT_EQ(frame.image->get_pixel(0, 0).alpha(), 0);
EXPECT_EQ(frame.image->get_pixel(60, 75), Gfx::Color::NamedColor::Red);
}
TEST_CASE(test_tiff_16_bits)
{
auto file = MUST(Core::MappedFile::map(TEST_INPUT("tiff/16_bits.tiff"sv)));