[cairo] API to set PostScript Language Level

[Adrian Johnson]

The PostScript backend currently generates Level 2 PostScript.
In order to support Level 3 features such as gradients an API function
for selecting the LanguageLevel is required.

The following API is based on the SVG restrict_to API. A patch to add
this API is attached.


typedef enum _cairo_ps_level {
    CAIRO_PS_LEVEL_2,
    CAIRO_PS_LEVEL_3
} cairo_ps_level_t;

void
cairo_ps_surface_restrict_to_level (cairo_surface_t    *surface,
                                    cairo_ps_level_t    level);

void
cairo_ps_get_levels (cairo_ps_level_t const  **levels,
                     int                      *num_levels);

const char *
cairo_ps_level_to_string (cairo_ps_level_t level);



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