[cairo] global clip for a cairo context

[Lawrence D'Oliveiro]

On Sun, 3 Jan 2016 19:42:52 +1300, I wrote:

> On Sun, 3 Jan 2016 16:17:04 +1030, Adrian Johnson wrote:
> 
> > Assuming a rectangular clip you could use something like:
> > 
> > clipped_surf = cairo_surface_create_for_rectangle (cairo_get_target
> > (cr), x, y, w, h);
> > clipped_cr = cairo_create (clipped_surf);  
> 
> Presumably that is intersected with the current clip on the parent
> surface...

Sorry, forgot that the clip is a characteristic of a context, not a
surface...