[Webkit-unassigned] [Bug 43718] New: Canvas: Fast-path for setting the already set color with setStrokeColor() and setFillColor()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=43718

           Summary: Canvas: Fast-path for setting the already set color
                    with setStrokeColor() and setFillColor()
           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


Some JS demos, for example "Monster" at Chrome Experiments, use the WebKit-specific color setters of CanvasRenderingContext2D.

For this particular demo, roughly 5% of the calls to setFillColor() have the same color as is already set on the context. We should detect this and make an early return before creating any CanvasStyle objects (or calling into GraphicsContext.)

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