[Webkit-unassigned] [Bug 53658] New: FEGaussianBlur kernel size is slightly wrong

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=53658

           Summary: FEGaussianBlur kernel size is slightly wrong
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: zimmermann at kde.org


The spec <http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement> says:

if d is odd, use three box-blurs of size 'd', centered on the output pixel.

... if d is even, two box-blurs of size 'd' (the first one centered on the pixel boundary between the output pixel and the one to the left, the second one centered on the pixel boundary between the output pixel and the one to the right) and one box blur of size 'd+1' centered on the output pixel.

The kernelPosition() gets this wrong, since it it fails to subtract the center pixel for at least the (std % 2) case.

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