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ppm.ml
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ppm.ml
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open Bigarray
type pixmap = string * int
let get (img, width) i j k =
Char.code (img.[((j * width) + i) * 3 + k])
let set (img, width) i j k v =
img.[((j * width) + i) * 3 + k] <- Char.unsafe_chr v
let setp (img, width) i j r g b =
let p = ((j * width) + i) * 3 in
img.[p] <- Char.unsafe_chr r;
img.[p + 1] <- Char.unsafe_chr g;
img.[p + 2] <- Char.unsafe_chr b
let init ~width ~height = (String.create (height * width * 3), width)
let width (s, width) = width
let height (s, width) = String.length s / width / 3
let dump file (img, width) =
let sz = String.length img in
let height = sz / 3 / width in
let f = open_out_bin file in
output_string f "P6\n# PL Club\n";
Printf.fprintf f "%d %d\n255\n" width height;
output_string f img;
close_out f
let load file =
let f = open_in_bin file in
assert (input_line f = "P6");
let s = input_line f in
let i = ref 0 in
while s.[!i] >= '0' && s.[!i] <= '9' do incr i done;
let width = int_of_string (String.sub s 0 !i) in
let height =
int_of_string (String.sub s (!i + 1) (String.length s - !i - 1)) in
assert (input_line f = "255");
let (s, _) as img = init width height in
really_input f s 0 (String.length s);
close_in f;
img