Post-lerp -> pre-scale if blend mode supports it.
We've been doing this for Plus and SrcOver, and now expand it to the
couple other blend modes like SrcATop and DstOver that also support this
trick.
We need to take some special care with rgb coverage, and continue
to lerp for any mode that contains an explicit source-alpha term.
This is explained in the comments.
Change-Id: Ie44edf1504f305aec0c69fc92504431e0efeb627
Reviewed-on: https://skia-review.googlesource.com/47401
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed