cairo samples

 arc
 arc_negative
 clip
 clip_image
 curve_rectangle
 curve_to
 fill_and_stroke2
 fill_and_stroke
 gradient
 image
 imagepattern
 libsvg
 operator_add
 operator_atop
 operator_atop_reverse
 operator_in
 operator_in_reverse
 operator_out
 operator_out_reverse
 operator_over
 operator_over_reverse
 operator_saturate
 operator_xor
 path
 set_line_cap
 set_line_join
 text_align_center
 text
 text_extents
 xxx_clip_rectangle
 xxx_dash
 xxx_long_lines
 xxx_multi_segment_caps
 xxx_self_intersect
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snippet_set_bg_svg (cr, "data/freedesktop.svg");
cairo_set_operator (cr, CAIRO_OPERATOR_OUT_REVERSE);
cairo_set_alpha (cr, 0.5);
cairo_set_rgb_color (cr, 1,0,0);
cairo_rectangle (cr, 0.2,0.2, 0.5,0.5);
cairo_fill (cr);
cairo_set_rgb_color (cr, 0,1,0);
cairo_rectangle (cr, 0.4,0.4, 0.4,0.4);
cairo_fill (cr);
cairo_set_rgb_color (cr, 0,0,1);
cairo_rectangle (cr, 0.6,0.6, 0.3,0.3);
cairo_fill (cr);