Dominik Röttsches 2da029b28f [COLRv1] Map linear gradient extrema to [0, 1] range ...

Prepare data to Skia's linear gradient shader so that the extrema are
[0, 1] when the data in the font does not have them at these
positions. This is required for the shader to correctly compute repeat
modes.

Add the test font from the Google color fonts repo [1] with stops at [0,
1], [0.2, 0.8], [0, 1.5], [0.5, 1.5] respectively, compare[2].

[1] https://github.com/googlefonts/color-fonts/blob/main/fonts/more_samples-glyf_colr_1.ttf
[2] https://github.com/googlefonts/colr-gradients-spec/issues/281#issuecomment-828346428

Bug: skia:11922
Change-Id: Ic62a26911fa177af35ca16f183b5985d884237a5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/405717
Commit-Queue: Dominik Röttsches <drott@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>

2021-05-17 12:24:37 +00:00

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