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open Bimage
let pixel_type : [< gray | rgb | rgba ] Color.t -> string =
fun c ->
match Color.t c with `Gray -> "gray" | `Rgb -> "rgb" | `Rgba -> "rgba"
let interlace = function Image.Planar -> "Plane" | Image.Interleaved -> "None"
let convert_command = ref "convert"
let identify_command = ref "identify"
let use_graphicsmagick () =
convert_command := "gm convert";
identify_command := "gm identify"
let read ?(create = fun _name -> Image.create) ?(layout = Image.Interleaved) t
color ?format filename =
let format =
match format with
| Some f -> f
| None ->
Filename.extension filename |> fun s ->
String.sub s 1 (String.length s - 1)
in
try
let read_image_data filename img =
let f = pixel_type img.Image.color in
let channels = Image.channels img in
let interlace = interlace layout in
let cmd =
Printf.sprintf "%s %s:'%s' -interlace %s -depth 8 %s:-" !convert_command
format filename interlace f
in
let input = Unix.open_process_in cmd in
for i = 0 to (Image.(img.width * img.height) * channels) - 1 do
let x = Kind.to_float u8 (input_byte input) in
let x = Kind.normalize u8 x in
let x = Kind.denormalize t x in
img.Image.data.{i} <- Kind.of_float t x
done;
close_in input
in
let cmd =
Printf.sprintf "%s -format \"%%w %%h\" '%s'" !identify_command filename
in
let identify = Unix.open_process_in cmd in
let s = input_line identify in
let () = close_in identify in
let shape = String.split_on_char ' ' (String.trim s) in
match List.map int_of_string shape with
| [ x; y ] ->
let img = create filename ~layout t color x y in
let () = read_image_data filename img in
Ok img
| _ -> Error `Invalid_shape
with
| End_of_file -> Error (`Msg "end of file")
| Failure msg -> Error (`Msg msg)
let read_all ?create ?layout kind color ?format filenames =
try
Ok
(Array.map
(fun f -> read ?create ?layout kind color ?format f |> Error.unwrap)
filenames)
with Error.Exc err -> Error err
let write ?quality ?format filename img =
let format =
match format with
| Some f -> f
| None ->
Filename.extension filename |> fun s ->
String.sub s 1 (String.length s - 1)
in
let width, height, channels = Image.shape img in
let f = pixel_type img.Image.color in
let quality =
match quality with None -> "" | Some q -> Printf.sprintf "-quality %d" q
in
let kind = Image.kind img in
let _depth = Kind.depth kind in
let cmd =
Printf.sprintf "%s -interlace %s -size %dx%d -depth 8 %s:- %s %s:'%s'"
!convert_command (interlace img.layout) width height f quality format
filename
in
let output = Unix.open_process_out cmd in
for i = 0 to (Image.(img.width * img.height) * channels) - 1 do
let x = Kind.to_float kind img.Image.data.{i} in
let x = Kind.normalize kind x in
let x = Kind.denormalize u8 x in
let x = Kind.of_float u8 x in
output_byte output x
done;
close_out output