Render spec clarification

[Keith Packard]

On Mon, 2008-10-13 at 13:50 -0400, Adam Jackson wrote:
> "like a copy" semantics of Option B to make
> the results predictable.

The core protocol uses 'like a copy' for CopyArea/CopyPlane. Actually
creating a copy would be fairly simple inside the Render code -- just
make a copy of the destination and use that as whichever source operands
match the destination.

> The other possibly unpleasant bit about Option B is it introduces more
> cases where the server will need to do significant allocation to satisfy
> rendering.  Probably not a huge deal, but worth noting.

A pain, to be sure.

If we do this, we would want to make sure the driver could recognize
scrolling cases and make those work correctly. And, make GraphicsExpose
events actually work too.

-- 
keith.packard at intel.com
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