[cairo] [PATCH] Path clipping

[Kristian Høgsberg]

Hi,

Here's a patch to implement clip-to-path functionality.  With this, the 
clipping parts of cairo snippets now work with the PDF backend.  The 
patch should be straight forward; the current clip path is stored as a 
linked list of cairo_clip_path_t's which store the actual path, the fill 
rule and the tolerance.  These are reference counted since several 
cairo_gstate_t's can share a subset of these.  In the PDF backend I'm 
reusing the path iteration code already in place for fill_path.

cheers,
Kristian
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