Source file images.ml
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exception Out_of_image
exception Wrong_image_type
exception Wrong_file_type
let () = Region.error := (fun () -> raise Out_of_image)
type t =
| Index8 of Index8.t
| Rgb24 of Rgb24.t
| Index16 of Index16.t
| Rgba32 of Rgba32.t
| Cmyk32 of Cmyk32.t
type sequence = {
seq_width: int;
seq_height: int;
seq_frames: frame list;
seq_loops: int
}
and frame = {
frame_left: int;
frame_top: int;
frame_image: t;
frame_delay: int
}
type rgb = Color.rgb = { mutable r: int; mutable g: int; mutable b: int }
type rgba = Color.rgba = { color: rgb; mutable alpha: int }
type cmyk = Color.cmyk =
{ mutable c : int; mutable m : int; mutable y : int; mutable k : int }
type 'a map = 'a Color.map = {
mutable max: int;
mutable map: 'a array
}
type format =
| Gif
| Bmp
| Jpeg
| Tiff
| Png
| Xpm
| Ppm
| Ps
let extension = function
| Gif -> "gif"
| Bmp -> "bmp"
| Jpeg -> "jpg"
| Tiff -> "tif"
| Png -> "png"
| Xpm -> "xpm"
| Ppm -> "ppm"
| Ps -> "eps"
let get_extension s =
try
let dotpos = String.rindex s '.' in
String.sub s 0 dotpos,
String.sub s (dotpos + 1) (String.length s - dotpos - 1)
with
| _ -> s, ""
let guess_extension s =
let s = String.lowercase s in
match s with
| "gif" -> Gif
| "bmp" -> Bmp
| "jpeg" | "jpg" -> Jpeg
| "tiff" | "tif" -> Tiff
| "png" -> Png
| "xpm" -> Xpm
| "ppm" | "pgm" | "pbm" -> Ppm
| "eps" | "ps" | "epsf" | "epsi" -> Ps
| _ -> raise Not_found
let guess_format file = guess_extension (snd (get_extension file))
type colormodel = Info.colormodel =
| Gray | RGB | Index | GrayA | RGBA | YCbCr | CMYK
type info = Info.info =
| Info_DPI of float
| Info_BigEndian | Info_LittleEndian
| Info_ColorModel of colormodel
| Info_Depth of int
| Info_Corrupted
let rec dpi = function
| [] -> None
| Info_DPI dpi :: _ -> Some dpi
| _ :: xs -> dpi xs
type load_option =
| Load_Progress of (float -> unit)
| Load_Resolution of float * float
| Load_only_the_first_frame
type save_option =
| Save_Quality of int
| Save_Progress of (float -> unit)
| Save_Interlace
let rec load_progress = function
| [] -> None
| Load_Progress p :: _ -> Some p
| _ :: xs -> load_progress xs
let rec load_resolution = function
| [] -> None
| Load_Resolution (px, py) :: _ -> Some (px, py)
| _ :: xs -> load_resolution xs
let rec save_progress = function
| [] -> None
| Save_Progress p :: _ -> Some p
| _ :: xs -> save_progress xs
let rec save_interlace = function
| [] -> false
| Save_Interlace :: _ -> true
| _ :: xs -> save_interlace xs
let rec save_quality = function
| [] -> None
| Save_Quality q :: _ -> Some q
| _ :: xs -> save_quality xs
type format_methods = {
check_header: (string -> header);
load: (string -> load_option list -> t) option;
save: (string -> save_option list -> t -> unit) option;
load_sequence: (string -> load_option list -> sequence) option;
save_sequence: (string -> save_option list -> sequence -> unit) option;
}
let methods_list = ref []
let file_format filename =
let result = ref None in
try
List.iter (fun (format, methods) ->
try
result := Some (format, methods.check_header filename);
raise Exit
with
| Wrong_file_type -> ()) !methods_list;
raise Wrong_file_type
with
| Exit ->
match !result with
| Some r -> r
| None -> assert false
let add_methods format methods =
methods_list := (format, methods) :: !methods_list
let load filename load_options =
let result = ref None in
try
List.iter (fun (_format, methods) ->
try
let _ = methods.check_header filename in
match methods.load with
Some load ->
result := Some (load filename load_options);
raise Exit
| None -> raise Wrong_file_type
with
| Wrong_file_type -> ()) !methods_list;
raise Wrong_file_type
with
| Exit ->
match !result with
| Some r -> r
| None -> assert false
let save filename formatopt save_options t =
try
let format =
match formatopt with
| Some format -> format
| None -> guess_format filename
in
let methods = List.assoc format !methods_list in
match methods.save with
Some save -> save filename save_options t
| None -> raise Wrong_file_type
with
| Not_found ->
raise Wrong_file_type
let size img =
match img with
| Index8 bmp -> bmp.Index8.width, bmp.Index8.height
| Index16 bmp -> bmp.Index16.width, bmp.Index16.height
| Rgb24 bmp -> bmp.Rgb24.width, bmp.Rgb24.height
| Rgba32 bmp -> bmp.Rgba32.width, bmp.Rgba32.height
| Cmyk32 bmp -> bmp.Cmyk32.width, bmp.Cmyk32.height
let width img =
match img with
| Index8 bmp -> bmp.Index8.width
| Index16 bmp -> bmp.Index16.width
| Rgb24 bmp -> bmp.Rgb24.width
| Rgba32 bmp -> bmp.Rgba32.width
| Cmyk32 bmp -> bmp.Cmyk32.width
let height img =
match img with
| Index8 bmp -> bmp.Index8.height
| Index16 bmp -> bmp.Index16.height
| Rgb24 bmp -> bmp.Rgb24.height
| Rgba32 bmp -> bmp.Rgba32.height
| Cmyk32 bmp -> bmp.Cmyk32.height
let destroy img =
match img with
| Index8 bmp -> Index8.destroy bmp
| Rgb24 bmp -> Rgb24.destroy bmp
| Index16 bmp -> Index16.destroy bmp
| Rgba32 bmp -> Rgba32.destroy bmp
| Cmyk32 bmp -> Cmyk32.destroy bmp
let sub img x y w h =
let f =
match img with
| Index8 img -> (fun x y w h -> Index8 (Index8.sub img x y w h))
| Rgb24 img -> (fun x y w h -> Rgb24 (Rgb24.sub img x y w h))
| Index16 img -> (fun x y w h -> Index16 (Index16.sub img x y w h))
| Rgba32 img -> (fun x y w h -> Rgba32 (Rgba32.sub img x y w h))
| Cmyk32 img -> (fun x y w h -> Cmyk32 (Cmyk32.sub img x y w h)) in
f x y w h
let copy img = sub img 0 0 (width img) (height img)
let blit src sx sy dst dx dy =
let f =
match src, dst with
| Index8 src, Index8 dst -> (fun sx sy -> Index8.blit src sx sy dst)
| Rgb24 src, Rgb24 dst -> (fun sx sy -> Rgb24.blit src sx sy dst)
| Index16 src, Index16 dst -> (fun sx sy -> Index16.blit src sx sy dst)
| Rgba32 src, Rgba32 dst -> (fun sx sy -> Rgba32.blit src sx sy dst)
| Cmyk32 src, Cmyk32 dst -> (fun sx sy -> Cmyk32.blit src sx sy dst)
| _ -> raise (Invalid_argument "Images.blit") in
f sx sy dx dy
let make_sequence t =
{ seq_width = width t;
seq_height = height t;
seq_frames = [ { frame_left= 0;
frame_top= 0;
frame_image= t;
frame_delay= 0 } ];
seq_loops = 0 }
let unoptimize_sequence seq =
let coe = function
| Index8 t -> Rgba32 (Index8.to_rgba32 t)
| Index16 t -> Rgba32 (Index16.to_rgba32 t)
| t -> t in
{ seq with
seq_frames = begin
let _, result =
let head_frame = List.hd seq.seq_frames in
List.fold_left (fun (previmage, result) frame ->
let newimage = copy previmage in
let src = coe frame.frame_image in
begin match src, newimage with
| Rgb24 _, _ | Cmyk32 _, _ ->
blit src 0 0 newimage frame.frame_left frame.frame_top
(width src) (height src)
| Rgba32 src32, Rgba32 dst32 ->
Rgba32.map Color.Rgba.merge
src32 0 0 dst32 frame.frame_left frame.frame_top
(width src) (height src)
| _ -> assert false
end;
(newimage, { frame_left = 0;
frame_top = 0;
frame_image = newimage;
frame_delay = frame.frame_delay } :: result))
(coe head_frame.frame_image, [head_frame])
(List.tl seq.seq_frames) in
List.rev result
end }
let load_sequence filename load_options =
let result = ref None in
try
List.iter (fun (_format, methods) ->
try
let _ = methods.check_header filename in
match methods.load_sequence, methods.load with
| Some load, _ ->
result := Some (load filename load_options);
raise Exit
| None, Some load ->
result := Some (make_sequence (load filename load_options));
| None, None -> raise Wrong_file_type
with
| Wrong_file_type -> ()) !methods_list;
raise Wrong_file_type
with
| Exit ->
match !result with
| Some r -> r
| None -> assert false
let save_sequence filename formatopt save_options seq =
try
let format =
match formatopt with
| Some format -> format
| None -> guess_format filename
in
let methods = List.assoc format !methods_list in
match methods.save_sequence with
Some save -> save filename save_options seq
| None -> raise Wrong_file_type
with
| Not_found ->
raise Wrong_file_type
let blocks img =
match img with
| Index8 img -> Index8.blocks img
| Rgb24 img -> Rgb24.blocks img
| Index16 img -> Index16.blocks img
| Rgba32 img -> Rgba32.blocks img
| Cmyk32 img -> Cmyk32.blocks img