RESOLVED MOVED 105183
Canvas Does Not Always Render Bezier Curves Or Quadratic Curves Correctly 
https://bugs.webkit.org/show_bug.cgi?id=105183
Summary Canvas Does Not Always Render Bezier Curves Or Quadratic Curves Correctly
Kevin Gale
Reported 2012-12-17 08:14:48 PST
If you open the attached webpage on a Mac running 10.8.2 using Safari or the latest WebKit nightly you should see several additional thin lines appearing through the text at various positions. If you open the attached webpage in Firefox then the output looks correct (I have attached screenshots showing both WebKit and Firefox). I have also compared this with a Mac running 10.7.5 and the output also looks correct in Safari and Chrome so it appears to be related to 10.8.2.
Attachments
Zipfile containing the HTML file + screenshots (413.30 KB, application/zip)
2012-12-17 08:16 PST, Kevin Gale 		no flags
Details
curveproblem.html (59 bytes, text/plain)
2012-12-18 15:06 PST, Dean Jackson 		no flags
Details
WebKit.png (52 bytes, text/plain)
2012-12-18 15:06 PST, Dean Jackson 		no flags
Details
FireFox.png (53 bytes, text/plain)
2012-12-18 15:07 PST, Dean Jackson 		no flags
Details
Test Case (107.96 KB, text/html)
2012-12-18 15:09 PST, Dean Jackson 		no flags
Details
Firefox results (164.37 KB, image/png)
2012-12-18 15:10 PST, Dean Jackson 		no flags
Details
WebKit Results (241.61 KB, image/png)
2012-12-18 15:11 PST, Dean Jackson 		no flags
Details
Attached the system profile from my Mac (276.05 KB, application/octet-stream)
2012-12-19 02:01 PST, Kevin Gale 		no flags
Details
Show Obsolete (3) View All Add attachment proposed patch, testcase, etc.
Kevin Gale
Comment 1 2012-12-17 08:16:39 PST
Created attachment 179746 [details] Zipfile containing the HTML file + screenshots
Dean Jackson
Comment 2 2012-12-18 15:06:01 PST
Created attachment 180034 [details] curveproblem.html
Dean Jackson
Comment 3 2012-12-18 15:06:26 PST
Created attachment 180035 [details] WebKit.png
Dean Jackson
Comment 4 2012-12-18 15:07:14 PST
Created attachment 180036 [details] FireFox.png
Radar WebKit Bug Importer
Comment 5 2012-12-18 15:08:25 PST
<rdar://problem/12905249>
Dean Jackson
Comment 6 2012-12-18 15:09:39 PST
Created attachment 180038 [details] Test Case
Dean Jackson
Comment 7 2012-12-18 15:10:50 PST
Created attachment 180040 [details] Firefox results
Dean Jackson
Comment 8 2012-12-18 15:11:40 PST
Created attachment 180041 [details] WebKit Results
Dean Jackson
Comment 9 2012-12-18 16:04:30 PST
I think this is hardware specific. I was unable to reproduce on an AMD card, and an integrated graphics Intel. Could you please attach a System Profile?
Kevin Gale
Comment 10 2012-12-19 02:01:18 PST
Created attachment 180122 [details] Attached the system profile from my Mac
Dean Jackson
Comment 11 2012-12-19 10:29:56 PST
(In reply to comment #10) > Created an attachment (id=180122) [details] > Attached the system profile from my Mac Thanks Kevin.
Dean Jackson
Comment 12 2012-12-20 17:40:14 PST
This is a retina Macbook Pro, uses Intel 4000 unless something else was triggering the discrete gpu.
Kevin Gale
Comment 13 2013-02-25 10:59:16 PST
(In reply to comment #12) > This is a retina Macbook Pro, uses Intel 4000 unless something else was triggering the discrete gpu. Hi. Just wondering if there was any sort of update on this. I noticed that 'InRadar' has been added to the keywords so is this a graphics driver issue rather than a WebKit issue? Thanks. Kevin.
Dean Jackson
Comment 14 2013-03-08 15:01:09 PST
We should wait to see if this reproduces on 10.8.3 when released.
Kevin Gale
Comment 15 2013-03-15 08:45:05 PDT
Hi. Just installed 10.8.3 and the problem still occurs. Regards, Kevin.
Dean Jackson
Comment 16 2013-03-15 11:45:32 PDT
Thanks for testing. We're looking into it.
Brent Fulgham
Comment 17 2022-02-10 19:48:49 PST
The fix for this issue was needed outside the WebKit project, therefore this is being resolved as 'Moved'. This should now be fixed in shipping software.
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