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WebP: Add test image for vertical image filtering

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I opened smolkling.webp in Photoshop, added a layer mask with a vertical
gradient, replaced the leftmost column with completely transparent
pixels (because the leftmost column is vertically predicted with the
horizontal filter too), and saved it as webp. That wasn't enough to
get a horizontal filter for the ALPH chunk though, so I also ran

    cwebp \
        -alpha_filter best \
        smolkling.webp \
        -o Tests/LibGfx/test-inputs/smolkling-vertical-alpha.webp

That did the trick.
This commit is contained in:
Nico Weber 2023-06-08 18:25:21 -04:00 committed by Tim Flynn
parent b0916d2133
commit a77b6c470a
Notes: sideshowbarker 2024-07-18 08:59:31 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/a77b6c470a
Pull-request: https://github.com/SerenityOS/serenity/pull/19330
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