RESOLVED DUPLICATE of bug 66036 Bug 61470
fast/canvas/canvas-composite.html fails with bad antialiasing on source-out 
https://bugs.webkit.org/show_bug.cgi?id=61470
Summary fast/canvas/canvas-composite.html fails with bad antialiasing on source-out
Adam Klein
Reported 2011-05-25 14:17:44 PDT
Created attachment 94856 [details] Bad source-out image Example result image attached. Notice the artifact of an outline on the top left of source-out.
Attachments
Bad source-out image (11.22 KB, image/png)
2011-05-25 14:17 PDT, Adam Klein 		no flags
Details
image from CoreGraphics (21.38 KB, image/png)
2011-05-25 14:28 PDT, James Robinson 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
James Robinson
Comment 1 2011-05-25 14:28:03 PDT
Created attachment 94860 [details] image from CoreGraphics here's a better example from coregraphics that doesn't have the same antialiasing issues as skia does.
James Robinson
Comment 2 2011-05-25 14:29:35 PDT
I think the basic issue here is that the clipOut is antialiased, so the pixels on the edge have partial alpha, so they get partially filled in by the globalCompositeOperation, and then get partially cleared by the clear call.
Ben Wells
Comment 3 2011-09-30 03:20:35 PDT
*** This bug has been marked as a duplicate of bug 66036 ***
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