RESOLVED WONTFIX 55514
[chromium] invalidating a rotated border causes different pixels to be painted 
https://bugs.webkit.org/show_bug.cgi?id=55514
Summary [chromium] invalidating a rotated border causes different pixels to be painted
Tony Chang
Reported 2011-03-01 15:01:27 PST
Repro steps: 1) Load the attached file in test_shell.exe. You should see a box rotated 20deg. 2) Drag the window off screen and back. 3) If you look carefully, you'll see that the edge is now a tiny bit different (a bit darker?). If you reload, the edges return to the lighter state. I suspect this is a problem in skia since I couldn't repro on mac. It's also hard to repro on Chromium because it saves a backing store of the image. It's the extra invalidate that causes the border to change.
Attachments
test case (255 bytes, text/html)
2011-03-01 15:01 PST, Tony Chang 		no flags
Details
better test case (342 bytes, text/html)
2011-03-01 15:54 PST, Tony Chang 		no flags
Details
initial load (22.04 KB, image/png)
2011-03-01 15:55 PST, Tony Chang 		no flags
Details
after invalidate (21.79 KB, image/png)
2011-03-01 15:56 PST, Tony Chang 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Tony Chang
Comment 1 2011-03-01 15:01:47 PST
Created attachment 84303 [details] test case
James Robinson
Comment 2 2011-03-01 15:15:24 PST
Can you post before/after screenshots of what you are seeing?
Tony Chang
Comment 3 2011-03-01 15:54:57 PST
Created attachment 84314 [details] better test case
Tony Chang
Comment 4 2011-03-01 15:55:31 PST
Created attachment 84315 [details] initial load
Tony Chang
Comment 5 2011-03-01 15:56:04 PST
Created attachment 84316 [details] after invalidate
Tony Chang
Comment 6 2011-03-01 15:56:42 PST
(In reply to comment #3) > Created an attachment (id=84314) [details] > better test case This shows a much more noticeable difference. The original test case only differed by a dozen pixels or so.
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