[cairo] font lifetime

[Amaury Jacquot]

Owen Taylor wrote:
> I think the image surface may have the clearest argument for a
> destroy notifier ... creating an image surface for a GdkPixbuf, a
> numeric-python array, an Xcursor  image and passing it to some other
> portion of code is a very natural operation.

I never could get the gdkpixbuf case to work satisfactolily, due to some 
ARGB / RGBA / whatever discrepancies..

Amaury