[Webkit-unassigned] [Bug 80323] New: [CSS Filters] Drop Shadow is not repainting correctly when repaint area is smaller than the filtered element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=80323

           Summary: [CSS Filters] Drop Shadow is not repainting correctly
                    when repaint area is smaller than the filtered element
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: achicu at adobe.com


Because we only create a source image of the repainted (dirty) rectangle, drop shadow considers that some areas should not be in shadow. We should apply the filter on the whole image instead, so that drop shadow knows what's in shadow outside the dirty area.

See attached files for an example and a screenshot.

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