Can you look at the pixman patch Matt Woodrow attached in https://bugzilla.mozilla.org/show_bug.cgi?id=563488 ? It supports the general self-copy case using a temporary buffer and optimizes simple SOURCE self-copy cases. Needs no new API.
Rob -- "He was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was upon him, and by his wounds we are healed. We all, like sheep, have gone astray, each of us has turned to his own way; and the LORD has laid on him the iniquity of us all." [Isaiah 53:5-6]
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