tree 3dd86434ae8c1f636f5e29dcae947c595840bd4b
parent a2eb235a16ed430896cc54989e683cf930319eb7
author Matt Sarett <msarett@google.com> 1490188802 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1490193557 +0000

Small downsample_3_3 optimization

Just a little less math...

mipmap_build_2047x2047_0_gamma
Before: 15.8ms
After:  13.4ms

Hard to see much difference on the gamma correct
mips, which are more dominated by load time.

BUG=skia:

Change-Id: I978cbc85a7d75cfcca2d5cd3fbc75e93413782f2
Reviewed-on: https://skia-review.googlesource.com/9988
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>