Bug 132950

Summary:

[CANVAS] Strokes do not render correctly when a globalCompositeOperation is in effect

Product:

WebKit

Reporter:

Branimir Lambov <blambov>

Component:

Canvas

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED CONFIGURATION CHANGED

Severity:

Normal

CC:

bfulgham, nikos.andronikos

Priority:

Version:

528+ (Nightly build)

Hardware:

Unspecified

OS:

Unspecified

URL:

http://jsfiddle.net/386sM/5/

Attachments:

Description	Flags
Test	none
Safari rendering	none
Expected rendering	none

Branimir Lambov

Reported 2014-05-15 05:33:12 PDT

Created attachment 231505 [details] Test Applying a stroke after globalCompositeOperation has been set to destination-in, destination-atop, source-in, source-out or copy does not result in correct rendering. See the attached file and/or fiddle. It draws pairs of canvases, one doing a stroke, setting compositing, then filling, the other filling, setting the complementing compositing mode, then stroking. What is the expected behavior? The pairs should be the same, e.g. stroke, source-in, fill should be the same as fill, dest-in, stroke. What went wrong? The stroke doesn't appear to be applied in the destination-in, destination-atop cases and does the wrong thing for source-in, source-out and copy. The rendering is correct on Opera 12 and Firefox 29 Linux and is also broken on Chrome 34 (https://code.google.com/p/chromium/issues/detail?id=373692). The current Safari output is also badly affected by https://bugs.webkit.org/show_bug.cgi?id=132948 and https://bugs.webkit.org/show_bug.cgi?id=132949. Safari is broken on both MacOS 10.9.2 (Safari 7.0.3) and iOS 7.1.1.

Attachments
Test (1.84 KB, text/html) 2014-05-15 05:33 PDT, Branimir Lambov	no flags	Details
Safari rendering (121.33 KB, image/png) 2014-05-15 05:33 PDT, Branimir Lambov	no flags	Details
Expected rendering (83.47 KB, image/png) 2014-05-15 05:34 PDT, Branimir Lambov	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Branimir Lambov

Comment 1 2014-05-15 05:33:56 PDT

Created attachment 231506 [details] Safari rendering

Branimir Lambov

Comment 2 2014-05-15 05:34:23 PDT

Created attachment 231507 [details] Expected rendering

Brent Fulgham

Comment 3 2022-07-18 14:47:35 PDT

Safari 16 now matches the expected rendering.

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