[Webkit-unassigned] [Bug 258137] New: Layer-backed GIF image animate improperly or flicker on Intel macOS 14 machines when bitmap-backend based ImageBuffer is used.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258137

            Bug ID: 258137
           Summary: Layer-backed GIF image animate improperly or flicker
                    on Intel macOS 14 machines when bitmap-backend based
                    ImageBuffer is used.
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Intel)
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bunnnywong at gmail.com
                CC: kkinnunen at apple.com

Created attachment 466703

  --> https://bugs.webkit.org/attachment.cgi?id=466703&action=review

A web page to reproduce this issue

Layer-backed GIF images may animate improperly or flicker.


See the attached page and screen recording for this issue, the GIF image with rabbit ears animates in a wrong frame rate and may even flicker.


This issue: 

* happens only on Intel-based machines running macOS 14 beta.

* happens only when the layer's backing store is small enough so that `ImageBufferShareableMappedIOSurfaceBitmapBackend` is used. (Introduced in: https://commits.webkit.org/264004@main.)

* happens when WebKit is built with both macOS 13 & 14 SDK.


I'm not sure if issue is WebKit specific or it's a CoreGraphics issue.

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