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Bitmap/Read a PPM file: Difference between revisions
added ocaml
(→{{header|Ada}}: Blocked input to improve performance) |
(added ocaml) |
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Line 92:
end;
</ada>
=={{header|OCaml}}==
<ocaml>let read_ppm ~filename =
let ic = open_in filename in
let line = input_line ic in
if line <> "P6" then invalid_arg "not a P6 ppm file";
let line = input_line ic in
let line =
try if line.[0] = '#' (* skip comments *)
then input_line ic
else line
with _ -> line
in
let width, height =
Scanf.sscanf line "%d %d" (fun w h -> (w, h))
in
let line = input_line ic in
if line <> "255" then invalid_arg "not a 8 bit depth image";
let all_channels =
let kind = Bigarray.int8_unsigned
and layout = Bigarray.c_layout
in
Bigarray.Array3.create kind layout 3 width height
in
let r_channel = Bigarray.Array3.slice_left_2 all_channels 0
and g_channel = Bigarray.Array3.slice_left_2 all_channels 1
and b_channel = Bigarray.Array3.slice_left_2 all_channels 2
in
for y = 0 to pred height do
for x = 0 to pred width do
r_channel.{x,y} <- (input_byte ic);
g_channel.{x,y} <- (input_byte ic);
b_channel.{x,y} <- (input_byte ic);
done;
done;
(all_channels,
r_channel,
g_channel,
b_channel)</ocaml>
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