[cairo] is self-copy supposed to work?

Chris Wilson chris at chris-wilson.co.uk
Fri Apr 30 04:28:34 PDT 2010

On Fri, 30 Apr 2010 22:36:56 +1200, "Robert O'Callahan" <robert at ocallahan.org> wrote:
> Should self-copy --- i.e. using the same source as source and destination of
> a composite --- be supported by cairo backends? I notice there are tests for
> self-copy, but it looks like they are expected to fail. Is pixman expected
> to cope with self-copies? I think I'm experiencing some bugs...

Currently self-copy behaviour is underspecified. I think the consensus is
that self-modification is undesired...

Cairo will perform whatever fixups are required to implement consistent
behaviour across the backends, just as soon as it is decided what that
behaviour should be.

Chris Wilson, Intel Open Source Technology Centre

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