[cairo] Extend methods for gradient patterns

[Bill Spitzak]

Clicking on "cairo_pattern_set_extend()" 
http://cairographics.org/manual/cairo-pattern.html#cairo-pattern-set-extend
reveals text that says "The default extend mode is CAIRO_EXTEND_NONE for 
surface patterns and CAIRO_EXTEND_PAD for gradient patterns." So I would 
say the first page is wrong and those should be moved up under pattern 
or replicated under cairo_gradient_t

Torsten Schoenfeld wrote:
> According to <http://cairographics.org/manual/bindings-patterns.html>, 
> cairo_pattern_set_extend() and cairo_pattern_get_extend() should be 
> methods of the surface pattern type.  In particular, they should not be 
> available to gradient patterns.  But snooping around cairo's source a 
> bit, it does seem to be sensible to use the extend stuff on gradient 
> patterns at least.  Who's right?
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