use integer math instead of float per-pixel. about a 2x speedup. not tested well, so this is just experimental.

BUG=

Review URL: https://codereview.chromium.org/15715015

git-svn-id: http://skia.googlecode.com/svn/trunk@9317 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed