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(* $Header: /home/cvs/gd4o/gd.mli,v 1.6 2003/11/25 01:02:32 matt Exp $ *)
(*
 * GD4O: An OCaml interface to the Gd graphics library.
 * Based on Shawn Wagner's OCamlGD 0.7.0.
 * Copyright (C) 2002  Shawn Wagner
 * Copyright (C) 2003  Matthew C. Gushee
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *)


type t  (* image type *)

(* GD images can only have 256 colors *)
exception Too_many_colors

(* Tried to find a preallocated color that wasn't *)
exception Color_not_found

(* Couldn't create or open an image. *)
exception Image_creation_failed

(* This build doesn't support some image format (Jpeg, Xpm, etc.) *)
exception Not_supported

(* An operation was attempted without having performed one or more prerequisites. *)
exception Illegal_state of string

(* All of these classes are virtual because users shouldn't be instatiating them.
   Instead, use the creation or opening functions listed at the bottom *)

(*
class virtual color :
object
  (* Returns the red part (0-255) of the color *)
  method virtual red_part : int
    (* Returns the green part (0-255) of the color *)
  method virtual green_part : int
    (* Returns the blue part (0-255) of the color *)
  method virtual blue_part : int
    (* Returns the code of the color. Please don't use. *)
  method virtual code : int
  method virtual antialiased : color
  method virtual is_aa : bool
end
*)

type color
type ftex_flag =
  | FTExSetSpacing
  | FTExSetCharmap
type ftex_charmap =
  | FTExUnicode
  | FTExShiftJIS
  | FTExBig5

(* The first color allocated for an image is it's background *)
class virtual color_allocator :
  object
    (* R, G, and B values are integers 0-255 *)
    method virtual create: red:int -> green:int -> blue:int -> color
      (* Return the closest-matching color of those already allocated *)
    method virtual closest: red:int -> green:int -> blue:int -> color
    method virtual closest_hwb: red:int -> green:int -> blue:int -> color
      (* Try exact, create, closest *)
    method virtual resolve: red:int -> green:int -> blue:int -> color
      (* Exact match color of those already allocated *)
    method virtual exact: red:int -> green:int -> blue:int -> color
      (* Try an exact, create *)
    method virtual find: red:int -> green:int -> blue:int -> color
    method virtual get_color_by_index: int -> color
    method virtual white: color
    method virtual black: color
    method virtual blue: color
    method virtual green: color
    method virtual red: color
    method virtual get_transparent: color
    method virtual set_transparent: color -> unit
    method virtual set_antialiased: bool -> unit
    method virtual set_brushed: bool -> unit
    method virtual set_styled: bool -> unit
    method virtual set_tiled: bool -> unit
    method virtual antialiased: unit -> int
    method virtual brushed: unit -> int
    method virtual styled: unit -> int
    method virtual styled_brushed: unit -> int
    method virtual tiled: unit -> int
    method virtual transparent: unit -> int
  end

type font
module Font :
  sig
    val tiny: font
    val small: font
    val medium: font
    val large: font
    val giant: font
  end

class virtual image :
  object
    (* This was private, but it needs to be exposed for things like tile
       brush images. *)
    method virtual get_image: t
  
    (* Return the color_allocator object associated with this image *)
    method virtual colors : color_allocator
  
    method virtual line: x1:int -> y1:int -> x2:int -> y2:int -> 
        ?pseudo:int -> color -> unit
    method virtual dashed_line: x1:int -> y1:int -> x2:int -> y2:int -> 
        ?pseudo:int -> color -> unit
    method virtual rectangle: x1:int -> y1:int -> x2:int -> y2:int -> 
        ?pseudo:int -> color -> unit
    method virtual filled_rectangle: x1:int -> y1:int -> x2:int -> y2:int -> 
        ?pseudo:int -> color -> unit
    method virtual polygon: pts:(int * int) array -> ?pseudo:int -> 
        color -> unit
    method virtual filled_polygon: pts:(int * int) array -> ?pseudo:int -> 
        color -> unit
    method virtual arc: cx:int -> cy:int -> w:int -> h:int -> s:int -> 
        e:int -> ?pseudo:int -> color -> unit
    method virtual closed_arc:
        cx:int -> cy:int -> w:int -> h:int -> s:int -> e:int ->
        ?nofill:bool -> ?edged:bool -> ?pseudo:int -> color -> unit
    method virtual closed_chord:
        cx:int -> cy:int -> w:int -> h:int -> s:int -> e:int ->
        ?nofill:bool -> ?edged:bool -> ?pseudo:int -> color -> unit 
    method virtual filled_ellipse: cx:int -> cy:int -> w:int -> h:int -> 
        ?pseudo:int -> color -> unit
      (* Fill an area bordered by the border color *)
    method virtual border_fill: x:int -> y:int -> border:color -> 
        fill:color -> unit
      (* Fill an area with the same color as the pixel  *)
    method virtual fill: x:int -> y:int -> color -> unit
  
    (* Turn on antialiasing. *)
    method virtual set_antialiased: color -> unit
    method virtual set_antialiased_dont_blend: 
      aacolor:color -> dontblend:color -> unit
  
    method virtual set_brush: image -> unit
    method virtual set_tile: image -> unit
    method virtual set_thickness: int -> unit
    method virtual set_clip: x1:int -> y1:int -> x2:int -> y2:int -> unit
  
      (* Draw one character *)
    method virtual letter: font:font -> x:int -> y:int -> c:char -> color -> unit
      (* Rotated 90 degrees *)
    method virtual letter_up: font:font -> x:int -> y:int -> c:char -> color -> unit
  
    method virtual string: font:font -> x:int -> y:int -> s:string -> color -> unit
      (* Rotated 90 degrees *)
    method virtual string_up: font:font -> x:int -> y:int -> s:string -> 
      color -> unit
      (* Freetype string *)
    method virtual string_ft:
      fg:color -> fname:string -> size:float -> angle:float -> 
      x:int -> y:int -> string -> int array
    method virtual string_ftex:
      fg:color -> fname:string -> size:float -> angle:float -> 
      x:int -> y:int -> ?flags:ftex_flag array -> ?spacing:float -> 
      ?charmap:ftex_charmap -> string -> int array
  
    method virtual set_pixel: x:int -> y:int -> color -> unit
    method virtual get_pixel: x:int -> y:int -> color
  
      (* Image's size *)
    method virtual width: int
    method virtual height: int
  
      (* Is proposed drawing location within the drawing area? *)
    method virtual in_range: x:int -> y:int -> bool
  
      (* Save to file *)
    method virtual save_as_png: string -> unit
    method virtual save_as_jpeg: ?quality:int -> string -> unit
  
    (* Dump to an out_channel. *)
    method virtual out_as_png: out_channel -> unit
    method virtual out_as_jpeg: ?quality:int -> out_channel -> unit

    (* Copy a region from another image to this image. *)
    method virtual copy: image -> x:int -> y:int -> src_x:int -> src_y:int ->
      w:int -> h:int -> unit
    method virtual copy_resized: image -> x:int -> y:int -> src_x:int -> 
      src_y:int -> w:int -> h:int -> src_w:int -> src_h:int -> unit
    method virtual copy_resampled: image -> x:int -> y:int -> src_x:int -> 
      src_y:int -> w:int -> h:int -> src_w:int -> src_h:int -> unit
    method virtual copy_rotated: image -> x:float -> y:float -> src_x:int ->
      src_y:int -> w:int -> h:int -> angle:int -> unit
    method virtual copy_merge: image -> x:int -> y:int -> src_x:int ->
      src_y:int -> w:int -> h:int -> pct:int -> unit
    method virtual copy_merge_gray: image -> x:int -> y:int -> src_x:int ->
      src_y:int -> w:int -> h:int -> pct:int -> unit
    method virtual palette_copy: image -> unit 
  end

(* Create a new image with the given size *)
val create: x:int -> y:int -> image (* Throws Gd.Image_creation_faield *)

(* Create a new image with the given size *)
val create_truecolor: x:int -> y:int -> image (* Throws Gd.Image_creation_faield *)

(* Open a png file. Throws Not_found and Gd.Image_creation_failed *)
val open_png: string -> image

(* Same, but for jpeg's *)
val open_jpeg: string -> image

val is_truecolor: t -> bool

(* Return the bounding box for a string rendered with FreeType *)
val ft_bbox: fname:string -> size:float -> angle:float -> x:int ->
  y:int -> string -> int array
val ftex_bbox: fname:string -> size:float -> angle:float -> x:int ->
  y:int -> ?flags:ftex_flag array -> ?spacing:float -> 
  ?charmap:ftex_charmap -> string -> int array