Nico Weber c84968dafd LibGfx: Add some support for decoding lossless webp files ...

Missing:
* Transform support (used by virtually all lossless webp files)
* Meta prefix / entropy image support

Working:
* Decoding of regular image streams
* Color cache

This happens to be enough to be able to decode
Tests/LibGfx/test-inputs/extended-lossless.webp

The canonical prefix code is very similar to deflate's, enough so that
this can use Compress::CanonicalCode (and take advantage of all the
recent performance improvements there).

2023-04-05 13:24:00 +02:00

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