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b7e31ba194
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
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|---|---|---|
| .. | ||
| 5.webp | ||
| 12-bit-progressive.jpg | ||
| 12-bit.jpg | ||
| big_image.jpg | ||
| buggie-bottom-left-compressed.tga | ||
| buggie-bottom-left-uncompressed.tga | ||
| buggie-raw.pbm | ||
| buggie-raw.pgm | ||
| buggie-raw.ppm | ||
| buggie-top-left-compressed.tga | ||
| buggie-top-left-uncompressed.tga | ||
| buggie.png | ||
| catdog-alert-2.webp | ||
| catdog-alert-3.webp | ||
| catdog-alert-8.webp | ||
| catdog-alert-13.webp | ||
| download-animation.gif | ||
| extended-lossless-animated.webp | ||
| extended-lossless.webp | ||
| extended-lossy-uncompressed-alpha.webp | ||
| extended-lossy.webp | ||
| icc-v2.png | ||
| icc-v4.jpg | ||
| p3-v4.icc | ||
| Qpalette.webp | ||
| rgb24.jpg | ||
| rgb_components.jpg | ||
| rgba32-1.bmp | ||
| serenity.ico | ||
| several_scans.jpg | ||
| several_scans_odd_number_mcu.jpg | ||
| simple-vp8.webp | ||
| simple-vp8l.webp | ||
| spectral_selection.jpg | ||
| successive_approximation.jpg | ||
| TestFont.font | ||
| width11-height11-colors2.webp | ||
| width11-height11-colors3.webp | ||
| width11-height11-colors15.webp | ||
