[Webkit-unassigned] [Bug 63930] New: Pixel difference in FEMorphology effect

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63930

           Summary: Pixel difference in FEMorphology effect
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: Piroska.Andras at stud.u-szeged.hu
                CC: zimmermann at kde.org, loki at webkit.org


Created an attachment (id=99692)
 --> (https://bugs.webkit.org/attachment.cgi?id=99692&action=review)
Screenshot from the bug in four browser (Opera, Firefox, QtTestBrowser, Chrome)

When an animated SVG uses the FEMorphology filter (erode or dilate) and the animation is done by JavaScript,
the Y-radius does not change in some cases. The changes related to X-radius works without any problem.
The issue should be somewhere around the event handling. Because if  the radius attribute is set once,
the svg does not update the value of Y-radius, but if the radius is set twice, the svg is updated first
time with a wrong Y-radius and second with the correct one.

for example:
    -if set the attribute of the filter twice the animation works as well
         example: (javascript)
        * dilate.setAttribute("radius",r);
        * dilate.setAttribute("radius",r);
    -but in this case not works:
        * dilate.setAttribute("radius", "1,7");
        * dilate.setAttribute("radius", r + ",1");
        the value of the X-radius at first is 1, after updated to 'r'
        and the value of the Y-radius at first is 7, but not updated to 1

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