[Webkit-unassigned] [Bug 42300] New: Canvas: Don't add shadow rect to dirty region when shadow alpha is 0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42300

           Summary: Canvas: Don't add shadow rect to dirty region when
                    shadow alpha is 0
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: Performance
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: andreas.kling at nokia.com
                CC: oliver at apple.com


CanvasRenderingContext2D::willDraw() will always add the current shadow rect to the dirty region.
We can skip this if the current shadow color has a zero alpha value.

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