[Webkit-unassigned] [Bug 253614] New: Use the Copy CompositeOperator when copying canvas into its layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253614

            Bug ID: 253614
           Summary: Use the Copy CompositeOperator when copying canvas
                    into its layer
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

When the canvas buffer is the only draw into the layer, we should be able to just directly copy the pixels instead of blending. This also means we can skip clearing the back buffer.

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