Composite and Shared Memory?

[Keith Packard]

Around 11 o'clock on Nov 14, Amir Bukhari wrote:

> this give us the ability to use Shared Memory Pixmap as off-screen, so we
> didn't need to copy the redirected window pixmap to our shared memory
> pixmap each time Damage occure.

That's a neat idea; I'm not sure how we could make it work though.  
Composite needs to create new pixmaps whenever the window size changes, 
and it can't be asynchronous (or we lose a bunch of X semantics).  So, 
somehow you'd have to have shared memory space sufficient to hold the new 
window contents.

Alternatively, we could create a request to *replace* the current pixmap 
with another which could be in shared memory.  That would have to be the 
'right' size (or Match error).

Anyone else have a better idea?

-keith


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