<http://trac.webkit.org/changeset/106274> added a new CompositeOperator called CompositeDifference. In CoreGraphics, this maps to kCGBlendModeDifference (see <http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Reference/CGContext/Reference/reference.html#//apple_ref/c/tdef/CGBlendMode>).
Created attachment 161225 [details] Patch
Comment on attachment 161225 [details] Patch Clearing flags on attachment: 161225 Committed r127043: <http://trac.webkit.org/changeset/127043>
All reviewed patches have been landed. Closing bug.