tree 2e32f528f77bb3b3ac04bc6b551a16463af4cac9
parent fa3783f17dba971e3204ba950965d9c65eb8711d
author Yuqian Li <liyuqian@google.com> 1515078522 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1515180805 +0000

Update 2pt conical gradient in raster pipeline

The updated algorithm matches our new GPU algorithm
(https://skia.org/dev/design/conical) and it brings
about 7%-26% speedup. In the next CL, I'll simplify
the GPU code by reusing the CPU code in this CL.

    7.20% faster in gradient_conical_clamp_hicolor
    8.94% faster in gradient_conicalZero_clamp_hicolor
   10.00% faster in gradient_conicalOut_clamp_hicolor
   11.72% faster in gradient_conicalOutZero_clamp_hicolor
   13.62% faster in gradient_conical_clamp_3color
   16.52% faster in gradient_conicalZero_clamp_3color
   17.48% faster in gradient_conical_clamp
   17.70% faster in gradient_conical_clamp_shallow
   20.60% faster in gradient_conicalOut_clamp_3color
   20.98% faster in gradient_conicalOutZero_clamp_3color
   21.79% faster in gradient_conicalZero_clamp
   22.48% faster in gradient_conicalOut_clamp
   26.13% faster in gradient_conicalOutZero_clamp

Bug: skia:
Change-Id: Ia159495e1c77658cb28e48c9edf84938464e501c
Reviewed-on: https://skia-review.googlesource.com/90262
Commit-Queue: Yuqian Li <liyuqian@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>