[Webkit-unassigned] [Bug 37241] New: Avoid painting areas of the background (incl. tiling) which are obscured by solid borders

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=37241

           Summary: Avoid painting areas of the background (incl. tiling)
                    which are obscured by solid borders
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: mitz at webkit.org


In some cases we can fall into image tiling code when drawing backgrounds when
we could have avoided this by being smarter about the fact that parts of the
background may be obscured by solid borders.

E.g.:

    .checkerboard {
        background: transparent url("checker.png");
        -webkit-background-size: 100% 100%;
        width: 576px;
        height: 576px;
        border: 20px solid rgba(1, 1, 1, 0.5);
        -webkit-transform: translateZ(0);
    }

where checker.png is a 576x576 image.

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