[cairo] Scrolling/Copying

[tim at teulings.org]

Hello! 

(I'm sending the same question again, since the last mail didn't had a 
subject and was a little bit short (and I did not get an answer) ;-)). 

I'm writing a GUI library (illumination.sourceforge.net). I recently started 
adding support for Cairo as a backend driver. Naturally I have some 
scrolling widgets that I implemented using XCopyArea for copying the 
visible, moving areas to reduce drawing overhead by avoiding a complete 
redraw. Now I'm searching for an equivalent method using Cairo. How would I 
do this? Create a surface from a visible area and draw it back? Would this 
be performant? Is there a better solution? 

-- 
Gruß...
      Tim.