[Webkit-unassigned] [Bug 43622] New: SVG masking performance very slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=43622

           Summary: SVG masking performance very slow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://ie.microsoft.com/testdrive/Performance/SVGDice/
                    Default.xhtml
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: senorblanco at chromium.org
                CC: zimmermann at kde.org, krit at webkit.org


The above page (once initialized) renders quite fast in Firefox.  In WebKit, it hangs for many seconds each frame.  It seems to be computing a luminance mask for a 5Kx5K image every frame.  Although mask creation could be optimized, I doubt that the other browsers are doing this computation, due to its size.  I suspect that either we're doing it at the wrong resolution, or there is an invalidation issue and the mask is being computed more often than necessary.

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