WebP: Add test image for horizontal image filtering

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I opened smolkling.webp in Photoshop, added a layer mask with a
horizontal gradient, 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-ps.webp \
        -o Tests/LibGfx/test-inputs/smolkling-horizontal-alpha.webp

That did the trick.

(Looks like doing the same with a vertical or diagonal gradient
_also_ produces a webp file with filtering_method 1, i.e. horizontal.)

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Nico Weber 2023-06-07 11:52:01 -04:00 • committed by Tim Flynn

parent 4e92027513

commit 737786f9a8

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