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open Printf
open Cairo
open Bigarray
let create() =
let data = Array1.create int8_unsigned c_layout 360_000 in
Gc.finalise (fun _ -> eprintf "DESTROY bigarray 'data'\n%!") data;
let surf = Image.create_for_data8 data Image.RGB24 ~w:300 ~h:300 in
Cairo.create surf
let () =
let cr = create() in
printf "With Cairo handle:\n%!";
set_source_rgb cr 1. 1. 1.;
rectangle cr 0. 0. ~w:300. ~h:300.;
fill cr;
Gc.compact(); Gc.compact();
set_source_rgb cr 1. 0. 0.;
move_to cr 10. 150.;
set_font_size cr 100.;
show_text cr "Hello";
Gc.compact(); Gc.compact();
eprintf "- Write image\n%!";
PNG.write (get_target cr) "test_image.png";
eprintf "- Finish surface\n%!";
Surface.finish (get_target cr);
Gc.compact()
(* Test for stride < 0 (not handled for now) and for incoherent width
/ stride *)
let () =
let mat = Array1.create int8_unsigned c_layout 80_000 in
let test_stride stride =
try
let surf = Image.create_for_data8 mat Image.A8 ~w:100 ~h:100 ~stride in
assert(Image.get_stride surf = stride)
with Error INVALID_STRIDE ->
assert(stride < 100)
in
test_stride 108;
test_stride 99;
test_stride 0;
test_stride (-108);
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