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[Deron Johnson]

Soeren Sandmann wrote On 01/19/06 07:23,:

> I realized that you actually only need the grab during 
> RaiseWindow/SwapBuffers:
> 
> - Draw stuff
> - glFinish()
> - grab server
> - raise window
> - swap buffers
> - ungrab server
> 
> Which will only hold the grab for a very short amount of time.

This may be the case for a device which performs SwapBuffers using a
copy operation, but it doesn't deal with devices that do SwapBuffers by
changing a bit in the DID table (these are called "video flip" devices).
These types of devices use the window's clip shape even while drawing to
the back buffer.