[Webkit-unassigned] [Bug 261069] New: Safari 17 Beta displays output of Webgl Offscreen Canvases vertically mirrored when copying to a BitmapRenderer context when premultipliedAlpha is set to false.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Sep 2 12:29:43 PDT 2023


https://bugs.webkit.org/show_bug.cgi?id=261069

            Bug ID: 261069
           Summary: Safari 17 Beta displays output of Webgl Offscreen
                    Canvases vertically mirrored when copying to a
                    BitmapRenderer context when premultipliedAlpha is set
                    to false.
           Product: WebKit
           Version: Safari 17
          Hardware: All
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: patrick.martin.r at gmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Created attachment 467528

  --> https://bugs.webkit.org/attachment.cgi?id=467528&action=review

Test case for the bug

Safari 17 Beta displays output of Webgl Offscreen Canvases vertically mirrored when copying to a BitmapRenderer context when premultipliedAlpha is set to false.
This seems to be the same bug as 259306 but I can't be certain as it doesn't appear to be fixed yet so I'm posting this bug anyways. The output of the canvas in the example can be compared with another browser to verify the bug.

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