[chromium] Painting a layer clears opaque rect in untouched tiles
Created attachment 128084 [details] Patch
Is this fixing a correctness bug or a performance improvement? I would expect that throwing away opaqueness could never result in an incorrect rendering, but might cause you to go slower sometimes.
Yes, performance. I noticed it while fixing the G+ bug, as many tiles were being drawn correctly when they should have stayed (incorrectly) opaque from the bug.
Comment on attachment 128084 [details] Patch Gotcha, thanks for the clarification. Looks good.
Comment on attachment 128084 [details] Patch Clearing flags on attachment: 128084 Committed r108431: <http://trac.webkit.org/changeset/108431>
All reviewed patches have been landed. Closing bug.