[Webkit-unassigned] [Bug 206215] New: Always Use CAIRO_OPERATOR_SOURCE to copyRectFromOneSurfaceToAnother

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206215

            Bug ID: 206215
           Summary: Always Use CAIRO_OPERATOR_SOURCE to
                    copyRectFromOneSurfaceToAnother
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Tomoki.Imai at sony.com

Most of copyRectFromOneSurfaceToAnother callers passed CAIRO_OPERATOR_SOURCE not to blend.
BackingStoreBackendCairoImpl::scroll had copyRectFromOneSurfaceToAnother with the default cairoOperator CAIRO_OPERATOR_OVER,
but scrolling should use CAIRO_OPERATOR_SOURCE because there is no need to blend and it can have a performance benefit.

copyRectFromOneSurfaceToAnother callers;
- https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/platform/graphics/cairo/BackingStoreBackendCairoImpl.cpp?rev=254496#L68
- https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/platform/graphics/cairo/BackingStoreBackendCairoImpl.cpp?rev=254496#L69
- https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/platform/graphics/cairo/GraphicsContextGLCairo.cpp?rev=254496#L72
- https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/platform/graphics/cairo/ImageBufferCairo.cpp?rev=254496#L489
- https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/platform/graphics/cairo/ImageBufferCairo.cpp?rev=254496#L653

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