[Webkit-unassigned] [Bug 85179] New: Webkit Wobble - Spritesheet Bug?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=85179

           Summary: Webkit Wobble - Spritesheet Bug?
           Product: WebKit
           Version: 525.x (Safari 3.2)
          Platform: Unspecified
               URL: http://jsfiddle.net/SzcQn/
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: trevor.mcinsley at gmail.com
                CC: trevor.mcinsley at gmail.com


This example should demonstrate the problem: http://jsfiddle.net/SzcQn/

On mouseover the sequence will play, on mouseout it will play in reverse, that is from right to left of the sprite sheet image.


In Firefox this displays fine, in webkit browsers it will wobble back and forth however. The direction of the wobble naturally depends on the direction the sprite sheet is scrolling on. Since the code is identical for moz and webkit and the image perfectly aligned I have concluded the only explanation is a problem in webkit when playing sprite sheet images in reverse.

I have tried different images and have used sheets that are arranged vertically instead, this has not resolved the issue. Currently this means that in order to have an animation that plays forward on one event and backwards on another in webkit it is necessary to include additional frames with such an animation on them. This is far from ideal with long animation sequences since it will waste resources.

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