Creating a pixbuf from a Cairo image surface

[Ari Jolma <ari jolma tkk fi>]

I'm intending to create an image surface in Cairo, draw on it, and, when 
done, create a gdk pixbuf from the image surface. Eventually the pixbuf 
is sent to the server side and converted into an image, or, in an 
alternative scenario it is saved as an image on the client side.

The only problem (not really, just a drawback) I can see in this is the 
fact that cairo formats and what gdk_pixbuf_new_from_data requires do 
not match. AFAIK gdk requires data that is made of 24 bit RGB pixels and 
cairo creates 32 bit ARGB or XRGB (X is unused 8 bits) pixels. So it 
seems that I need to do a copy from one buffer to another in the last 
step in the process.

Am I correct? Or is there something built-in that I could use for the 
conversion.

Regards,

Ari

--
Prof. Ari Jolma
Geoinformaatio- ja paikannustekniikka / Geoinformation and positioning
Teknillinen Korkeakoulu / Helsinki University of Technology
tel: +358 9 451 3886 address: POBox 1200, 02015 TKK, Finland
Email: ari.jolma at tkk.fi URL: http://www.tkk.fi/~jolma