cairo_pattern_add_color_stop_rgba (shine_pattern, 0, 1,1,1,0.0);
cairo_pattern_add_color_stop_rgba (shine_pattern, 0.2, 1,1,1,0.4);
cairo_pattern_add_color_stop_rgba (shine_pattern, 1, 1,1,1,0.1);
cairo_pattern_add_color_stop_rgba (shine_pattern, 0, 1,1,1,0.0);
cairo_pattern_add_color_stop_rgba (shine_pattern, 0.2, 1,1,1,0.4);
cairo_pattern_add_color_stop_rgba (shine_pattern, 1, 1,1,1,0.1);