03588412c8
The old code made the wrong assumptions about premultiplication.
There are three relevant steps here for decoding a webp frame:
1 tell libwebp to decode
2 colorXform the result (sometimes)
3 blend with the prior frame (sometimes)
Rearrange the code to premultiply at the blend step, in a linear space.
If the client wants unpremul, the blend step will unpremul after.
If there is no blending, the colorXform (if any) will premultiply.
If only step 1 is necessary, let libwebp premultiply.
This fixes an animated image that has an opaque frame 0 followed by a
frame with alpha that blends with it.
Add the test image that failed (https://mathiasbynens.be/demo/animated-webp)
The prior fix is in
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| bots | ||
| branch-config | ||
| config | ||
| project-config | ||
| README.md | ||
This directory contains infra-specific files. The branch-config/ directory contains configs that are specific to the master branch (e.g. config for the CQ committing to the master branch), while project-config/ directory contains project-wide configuration (e.g. list of buckets for cr-buildbucket service and list of refs known to the infra services).