RESOLVED MOVED 225873
Drawing an sRGB image into a DisplayP3 canvas and then into sRGB canvas yields different results than if you only draw it into the sRGB canvas 
https://bugs.webkit.org/show_bug.cgi?id=225873
Summary Drawing an sRGB image into a DisplayP3 canvas and then into sRGB canvas yield...
Sam Weinig
Reported 2021-05-17 08:47:29 PDT
Drawing an sRGB image into a DisplayP3 canvas and then into sRGB canvas yields different results than if you only draw it into the sRGB canvas.
Attachments
Test case where both are drawn and tested (2.44 KB, text/html)
2021-05-17 08:48 PDT, Sam Weinig 		no flags
Details
Test case where only the sRGB canvas is drawn into (2.45 KB, text/html)
2021-05-17 08:49 PDT, Sam Weinig 		no flags
Details
Visual Test (all three squares should be the same color) (2.23 KB, text/html)
2021-05-17 09:06 PDT, Sam Weinig 		no flags
Details
Visual Test (all three squares should be the same color) (2.16 KB, text/html)
2021-05-17 14:02 PDT, Sam Weinig 		no flags
Details
Visual Test (only the sRGB ones) (2.16 KB, text/html)
2021-07-13 09:42 PDT, Sam Weinig 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Sam Weinig
Comment 1 2021-05-17 08:48:59 PDT
Created attachment 428832 [details] Test case where both are drawn and tested
Sam Weinig
Comment 2 2021-05-17 08:49:27 PDT
Created attachment 428833 [details] Test case where only the sRGB canvas is drawn into
Sam Weinig
Comment 3 2021-05-17 08:50:31 PDT
NOTE: This requires ToT WebKit with the CanvasColorSpacesEnabled feature enabled.
Sam Weinig
Comment 4 2021-05-17 08:52:29 PDT
This seems to be related to some cache, as to see the results, you must open a new window for each test case, otherwise, the tests will taint each other.
Sam Weinig
Comment 5 2021-05-17 08:55:14 PDT
It also seems to have to do with canvas accelerated graphics as disabling that (via the Debug -> Drawing and Compositing Flags, etc.) causes the issue to go away.
Sam Weinig
Comment 6 2021-05-17 09:06:26 PDT Comment hidden (obsolete)
Sam Weinig
Comment 7 2021-05-17 14:02:08 PDT
Created attachment 428866 [details] Visual Test (all three squares should be the same color)
Sam Weinig
Comment 8 2021-05-17 14:03:01 PDT
Updated the visual test case, the getImageData() was not necessary. Now to uncover all the different image caches in WebKit to see which one is acting up.
Radar WebKit Bug Importer
Comment 9 2021-05-24 08:48:16 PDT
<rdar://problem/78402035>
Sam Weinig
Comment 10 2021-07-13 09:42:06 PDT
Created attachment 433411 [details] Visual Test (only the sRGB ones)
Cameron McCormack (:heycam)
Comment 11 2021-08-10 22:20:16 PDT
This is being tracked internally.
Sam Weinig
Comment 12 2021-08-11 10:11:50 PDT
👍
Note You need to log in before you can comment on or make changes to this bug.