[Cairo] [patch] implement push/pull on xc surfaces

[graydon hoare]

Carl Worth <cworth at east.isi.edu> writes:

> [*] I haven't actually tested this on a non-Render server yet. But I
> did install a fake libXrender that acts as if the extension doesn't
> exist. So I'm fairly confident I've seen the behavior one will get
> with a non-Render server.

another easy way to test this is against xvnc, which doesn't seem to
know about RENDER. here is what I test with:

$ cat fake-x-server.sh
#!/bin/bash
vncserver -depth 24 -geometry 800x600 -localhost :1 
vncviewer -truecolor -depth 24 :1

-graydon