[Webkit-unassigned] [Bug 107848] New: [CSS Filters] Using negative drop-shadow radius values has slow performance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=107848

           Summary: [CSS Filters] Using negative drop-shadow radius values
                    has slow performance
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: achicu at adobe.com
                CC: dino at apple.com, mvujovic at adobe.com


Using a negative radius for the drop-shadow filters has slow repaint performance.

Also added a bug on the spec to check what's the right behavior for negative radius lengths:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=20762

Example:
-webkit-filter: drop-shadow(10px 10px -1px red)

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