[Webkit-unassigned] [Bug 115743] New: shrink repaint rectangle when clip was applied to canvas.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115743

           Summary: shrink repaint rectangle when clip was applied to
                    canvas.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: arno at renevier.net


Hi,
currently, when an operation is performed on the canvas, the enclosing rect is repainted.
But when a clip is applied to the canvas, we could shrink the rectangle to the clipped area, and decrease the repainted area.
We have GraphicsContext::clipBounds which returns us the an enclosing rectangle of the clipped area. So we could use that rectangle, and intersect it with the dirtyRect in CanvasRenderingContext2D::didDraw

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