[Cairo] Gradients

[Thomas Hunger]

Hi,
I did a linear gradient using cairo the way described in the OLS paper. Now I 
wonder if I want to do complex gradients, like interpolating between 
different "color-points" or a plain radial one, will I always have to use 
surfaces which I compose myself or are there already some thoughts on 
different ways to accomplish this?
As I understand drawpixel would be an option, but it does not really make a 
difference, since I would have to compute the interpolations myself,  too.
regards,
Thomas Hunger