commit 4d68c244a73683abe18c22f2a81cc4f5ac9717bf
author Mike Klein <mtklein@google.com> Fri Feb 19 05:30:45 2021 -0600
committer Mike Klein <mtklein@google.com> Tue Feb 23 20:22:07 2021 +0000
tree fd0c4056a02c677cc2f4362896d6d0d84195138d
parent 63f75fc1b6d9ec7442a4ac1f775bab937e83856f

refactor high-contrast filter

Rewrite as one cacheable runtime effect with uniforms paralleling
SkHighContrastConfig.  This is mostly for style, in the sense of
readability but also how I'd recommend writing these effects generally:
one program body controlled by uniforms.  Callers needing specialization
can write their own effect (or use our TBD uniform->constant facility).

Test isAlphaUnchanged(), and make it so by not saturating c.a.

MaliT880 was producing seriously bad results until I switched to mix().

Change-Id: Ia4cfef25fe26643f6832a5fa0843b28dafc5b284
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/372295
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>