[Webkit-unassigned] [Bug 233843] New: [GPU Process] (REGRESSION r285597): Fix SVGFilter clamping calculation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233843

            Bug ID: 233843
           Summary: [GPU Process] (REGRESSION r285597): Fix SVGFilter
                    clamping calculation
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Before r285597, there were two transformations for SVGFilter: (1) the transform from the renderer of the SVGFilter to the outer root and (2) the clamping scale. But since we use only the scaling part of the outer root transformation in scaling the SVGFilter, in r285597 the clamping scale and the outer root scale were merged in one FloatSize called filterScale.

But I misunderstood the purpose and the arguments of ImageBuffer::sizeNeedsClamping(). And I think also there is a bug in SVGRenderingContext::createImageBuffer(). In this bug the following layout tests should be un-skipped.

webkit.org/b/232705 imported/blink/svg/filters/filter-huge-clamping.svg [ Skip ]
webkit.org/b/232705 svg/filters/big-sized-off-viewport-filter.svg [ Skip ]

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