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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int              w,h,stride;
char            *buffer;
cairo_surface_t *image;

cairo_arc (cr, 0.5, 0.5, 0.3, 0, 2*M_PI);
cairo_clip (cr);
cairo_new_path (cr); /* path not consumed by clip()*/

buffer = read_png_argb32 (
              "data/romedalen.png", &w,&h, &stride);
image  = cairo_surface_create_for_image (
              buffer, CAIRO_FORMAT_ARGB32, w,h, stride);

cairo_scale (cr, 1.0/w, 1.0/h);

cairo_move_to (cr, 0, 0);
cairo_show_surface (cr, image, w, h);

cairo_surface_destroy (image);
free (buffer);