[Webkit-unassigned] [Bug 185837] New: Animated GIFs with a 90 degree X or Y rotation do not animate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185837

            Bug ID: 185837
           Summary: Animated GIFs with a 90 degree X or Y rotation do not
                    animate
           Product: WebKit
           Version: Safari 11
          Hardware: All
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonathan at tumult.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 340881

  --> https://bugs.webkit.org/attachment.cgi?id=340881&action=review

Repro html and gif file

If an animated GIF (either via background-image or img tag) is set to have a 90 degree rotation on the X or Y axis (3d) then it will not animate.

If there is no perspective this may make sense as a performance optimization, but it occurs even if perspective is set and the image is being shown.

Attachment has a simple repro case.

Resizing the window causes a single frame re-render.

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