drawing on a pixbuf

[Yann Leydier <yann leydier info>]

Hi,

this question is half Gtkmm, half Cairomm… I need to draw rectangles on 
a pixbuf and I need it to be fast. I could do this accessing the pixels 
directly but it's not elegant. ;o)

I tried to wrap a Cairo surface on the pixbuf's pixels but the rowstride 
is apparently not computed in the same way.

Before I spend more time on this, is there a way to interface Cairo with 
Gdk::Pixbuf without copying all the pixel values twice ?

Thanks,
yann