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cairo_pattern_t *pat;

pat = cairo_pattern_create_linear (0.0, 0.0,  0.0, 256.0);
cairo_pattern_add_color_stop_rgba (pat, 1, 0, 0, 0, 1);
cairo_pattern_add_color_stop_rgba (pat, 0, 1, 1, 1, 1);
cairo_rectangle (cr, 0, 0, 256, 256);
cairo_set_source (cr, pat);
cairo_fill (cr);
cairo_pattern_destroy (pat);

pat = cairo_pattern_create_radial (115.2, 102.4, 25.6,
                                   102.4,  102.4, 128.0);
cairo_pattern_add_color_stop_rgba (pat, 0, 1, 1, 1, 1);
cairo_pattern_add_color_stop_rgba (pat, 1, 0, 0, 0, 1);
cairo_set_source (cr, pat);
cairo_arc (cr, 128.0, 128.0, 76.8, 0, 2 * M_PI);
cairo_fill (cr);
cairo_pattern_destroy (pat);