[Webkit-unassigned] [Bug 139417] New: Incorrect rounding in feGaussianBlur filter effect

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139417

            Bug ID: 139417
           Summary: Incorrect rounding in feGaussianBlur filter effect
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: zimmermann at kde.org

Created attachment 242854
  --> https://bugs.webkit.org/attachment.cgi?id=242854&action=review
Safari-Rendering

Open the following SVG in WebKit:

<svg xmlns="http://www.w3.org/2000/svg" version="1.0">
  <filter id="f1">
    <feGaussianBlur in="SourceGraphic" stdDeviation="0.000000000000000000000000001" />
  </filter>
  <rect width="100%" height="100%" fill="lime"/>
  <circle fill="red" r="98" cx="200" cy="100"/>
  <circle fill="lime" r="100" cx="200" cy="100" filter="url(#f1)"/>
</svg>

Result: A lime background with the bottom arch of the blur effect although the stdDeviation of the effect is almost equal to zero.
Expected: A pure lime background is drawn. The same background can be drawn if the filter effect above is changed to be: <feGaussianBlur in="SourceGraphic" stdDeviation="0" />

NOTE: Both Chrome and FireFox display this SVG as expected.

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