[cairo] add solid/gradient pattern info getters

[Carl Worth]

On Thu, 14 Sep 2006 12:40:01 -0400, Behdad Esfahbod wrote:
>   cairo_pattern_get_color_stop_rgba (*pattern, *offset, *r, *g, *b, *a,
> index);
>   cairo_pattern_get_num_color_stops (*pattern, *num);

This has the nice advantage that the caller can use this approach to
fill in the their own data structure, (where it's quite unlikely that
the user would actually have color stops all in one flat array, so the
other approach would force a copy/conversion on the user).

-Carl
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