RESOLVED CONFIGURATION CHANGED85434
Overlapping canvas gradients causes flicker. 
https://bugs.webkit.org/show_bug.cgi?id=85434
Summary Overlapping canvas gradients causes flicker.
Greg Ray
Reported 2012-05-02 16:43:59 PDT
Created attachment 139913 [details] Example of flicker caused by winding. Please review attached file for example. I am using a technique of clockwise followed by anti clockwise to punch a hole in path and then clipping the non overlapping portions of the anti clockwise path to create a inset shadow effect. I suspect its either taking to much time to perform the draw operations or the shader buffer is overflowing. Expected no flicker. Got flicker.
Attachments
Example of flicker caused by winding. (10.42 KB, text/html)
2012-05-02 16:43 PDT, Greg Ray 		no flags
Details
Flicker stops when overlapping gradient removed. (10.70 KB, text/html)
2012-05-02 17:48 PDT, Greg Ray 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Greg Ray
Comment 1 2012-05-02 17:47:41 PDT
Turns out this was caused by overlapping gradients. I removed the overlapping gradient and it stopped flickering. Adding additional attachment with non-overlapping gradient for reference.
Greg Ray
Comment 2 2012-05-02 17:48:17 PDT
Created attachment 139926 [details] Flicker stops when overlapping gradient removed.
Radar WebKit Bug Importer
Comment 3 2012-05-03 13:55:09 PDT
<rdar://problem/11376226>
Simon Fraser (smfr)
Comment 4 2015-10-24 21:06:06 PDT
Does this bug still reproduce in Safari 9?
Note You need to log in before you can comment on or make changes to this bug.