might as well use SkRasterPipeline::gamma too

This is a pretty good speedup over parametric_* when we hit it.
It's both less math and fewer stages to hop through.

Change-Id: I97b6e6b6c290441238f0f61bea47786eacc2a9c7
Reviewed-on: https://skia-review.googlesource.com/140569
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed