[Webkit-unassigned] [Bug 99342] New: [CSS Exclusions] Handle special case "empty" shapes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=99342

           Summary: [CSS Exclusions] Handle special case "empty" shapes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: giles_joplin at yahoo.com
        Depends on: 98548


The following special case shapes will be considered "empty" in the sense that ExclusionShape::getIncludedIntervals() and ExclusionShape::getExcludedIntervals() will always return empty lists of intervals: rectangles of zero width or height, circles with 0 radius, ellipses with 0 radiusX or radiusY, polygons with less than 3 vertices.

Note that this isn't an exhaustive list of special cases.  Still remaining: polygons with less than three vertices that are not coincident or colinear, rectangles whose corner radiusX is greater than the rectangle's width/2, rectangles whose corner radiusY is greater than the rectangle's height/2, scenarios where shape-padding and shape-padding exceeds the shape's interior space.

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