tree 877ce31c1cf2e2c5bb080bb8aa368ec378c2d88b
parent 1950d5f58f56f6a0fb5dc5aa3f5caac991f0b2ce
author epoger@google.com <epoger@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> 1385148378 +0000
committer epoger@google.com <epoger@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> 1385148378 +0000

rebaseline_server: improve pixel diff reporting
- fix differing pixels count (we weren't always doing this right)
- report number of differing pixels, as well as percentage
- report worst difference per RGB channel
- apply alpha mask to difference image (changed pixels = opaque, unchanged = transparent)
- add tooltips with further explanation of pixel diffs
(SkipBuildbotRuns)

R=mtklein@google.com

Review URL: https://codereview.chromium.org/82823005

git-svn-id: http://skia.googlecode.com/svn/trunk@12366 2bbb7eff-a529-9590-31e7-b0007b416f81