[cairo] obtaining image memory from glitz backend

[kysucix]

Hi :) I would like to obtain a direct pointer to the image memory just
after the glitz surface has been shown. With pbuffers it should be
possible but I don't know how. 
I just would like to use convolution filter and transfomation for freej
in order to have hw accelerated video filters.
Any idea ? :)
Best Regards
Silvano Galliani aka kysucix
--
If you do not wish a man to do a thing, you had better get him to talk
about it; for the more men talk, the more likely they are to do nothing
else.   
    Carlyle
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