[Gtk-sharp-list] How can I save a cairo imagesurface as a pixbuf

[alanb]

I have a treeview and I want to store dynamically generated images in one of
its columns.  Reading the treeview tutorial I see that I need my image as a
pixbuf. I am drawing the images using Cairo, all I can see in the
imagesurface  API is to save as a png file directly with no access to its
underlying stream which I could use. So how can I convert a Cairo image to a
pixbuf? 

If I use a Gdk.pixmap instead and draw to it, again how do I convert it to a
pixbuf?

thanks
Alan
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