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WebP/Lossy: Add test for lossy webp with uncompressed alpha

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The alpha channel of a lossy webp is always stored separately from
the (lossy) RGB data. Alpha is either compressed in a lossless webp
that stores just the alpha data, or it's stored completely
uncompressed. (But again, even if it's compressed, it's losslessly
compressed.)

This adds a test for uncompressed alpha, which I hadn't tested before.
It seems to work correctly, though :^)

I generated the test image by running:

    ~/Downloads/libwebp-1.3.0-mac-arm64/bin/cwebp \
      -alpha_method 0 \
      Tests/LibGfx/test-inputs/extended-lossless.webp \
      -o Tests/LibGfx/test-inputs/extended-lossy-uncompressed-alpha.webp
This commit is contained in:
Nico Weber 2023-05-29 19:19:29 -04:00 • committed by Andreas Kling
parent a22cbc9a28
commit b7e31ba194
2 changed files with 25 additions and 0 deletions
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