Fix math in coverage_to_alpha() (renamed coverage_to_partial_alpha()), behind
a #define so that we can stage coping with the huge amount of rebaselining
necessary.

http://codereview.appspot.com/5696049/



git-svn-id: http://skia.googlecode.com/svn/trunk@3243 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed