[compiz] Compiz Window capture

[jwhite at maths.uq.edu.au]

Hi All,

I am trying to write a program that can take a screenshot of a window  
and display it on a remote machines display using openGL. Most  
importantly the program needs to be able to take a screen shot of the  
window even when it is hidden. I saw that compiz does this very well  
when you use the Switcher to change windows (it updates the preview of  
the window even when it is hidden). I was wondering where I could find  
this code and even more importantly its documentation.

Thanks

P.S. At the moment I am not worried about the performance, I am just  
trying to get it working.

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