[Webkit-unassigned] [Bug 39248] New: Using webkit-mask-box-image can cause "fringe" when transforming/rotating

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39248

           Summary: Using webkit-mask-box-image can cause "fringe" when
                    transforming/rotating
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://panic.com/~cabel/bugs/mask1.html
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: cabel at panic.com


SUMMARY:
We are creating an element, filling it with a color, and using -webkit-mask-box-image to mask the element into a shape.

BUG:
Once rotated or transformed, pixel "fringe" shows up on the outside of the element, like a very thin border.
This is particularly painful when animating the element.

NOTES:
Load the provided reduced test case URL to see the problem.

- On top, see the 30deg rotated element. Notice that it appears to have a thin purple "border".
- On bottom, the same element without rotation. Note that there is no "border" or bounding box.

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