Re: memory efficient compisiting

Around 19 o'clock on Mar 2, Matt Jones wrote:

> I was under the impression that this is what the DAMAGE extension does
> (return modified regions - why you can handle a full screen transparent
> object in software rendering). Please correct me if I'm wrong.

Yes, Damage monitors areas affected by 2D rendering so that repaints can 
be minimized.  One thing I haven't got at the moment is any way to 
synchronize updates with vrefresh (no interrupt->Xsync connection), so I'm 
currently painting as fast as I can, which is a waste of resources.

Eric Anholt nearly has a DRI-based 2D X server running on the radeon with 
full Render acceleration; that should provide a good platform for testing 
compositing performance.  Now we just need to get him back from Cuba, or 
get someone else to get things working before then.

-keith

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