[cairo] Scrolling/Copying

[Keith Packard]

On Fri, 2005-06-24 at 10:19 -0700, Bill Spitzak wrote:

> So I guess this means that copying areas should be detected. I don't 
> think there is any need to work correctly unless opaque copy is being 
> done, ie any compositing operation other than src, and any repeating or 
> alpha, will produce undefined results.

It's easy enough to require that the operation work as if a temporary
copy of the surface were made and that copy used for any overlapping
operands.  A trivial hack would be to do just that, and in fact we
already have that mechanism in place in cairo today.

-keith

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