[cairo] new pattern interface and OpenGL patch

[Carl Worth]

On Mar 25, David Reveman wrote:
 > I thought of another solution to the 'cairo_gl_surface_create' problem:
 > 
 > A simple:
 > cairo_set_target_glc (glc_surface_t *surface);

Ah, shoot, you beat me to it. ;-)

 > I like this solution, it would make things a lot simpler for cairo. The
 > disadvantage is of course that the user needs to know about libglc.

I like it very much as well. I was going to propose it earlier, but I
didn't know if you felt that libglc was appropriate for user
visibility, (since it began life as an OpenGL equivalent for the
Render interface). Since you like it too, I think we have our answer.

-Carl