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|
(***********************************************************************)
(* *)
(* MLTk, Tcl/Tk interface of Objective Caml *)
(* *)
(* Francois Rouaix, Francois Pessaux, Jun Furuse and Pierre Weis *)
(* projet Cristal, INRIA Rocquencourt *)
(* Jacques Garrigue, Kyoto University RIMS *)
(* *)
(* Copyright 2002 Institut National de Recherche en Informatique et *)
(* en Automatique and Kyoto University. All rights reserved. *)
(* This file is distributed under the terms of the GNU Library *)
(* General Public License, with the special exception on linking *)
(* described in file LICENSE found in the Objective Caml source tree. *)
(* *)
(***********************************************************************)
open Camltk
open Widget
open Support
open Protocol
open Tkintf
external init : unit -> unit = "tkanim_init"
type gifFrame = {
imagephoto : imagePhoto;
frameWidth : int;
frameHeight : int;
left : int;
top : int;
delay : int
}
type animatedGif = {
frames : gifFrame list;
animWidth : int;
animHeight : int;
loop : int
}
type imageType =
| Still of Tk.options
| Animated of animatedGif
let debug = ref false
let cTKtoCAMLgifFrame s =
match splitlist s with
| [photo; width; height; left; top; delay] ->
{imagephoto = cTKtoCAMLimagePhoto photo;
frameWidth = int_of_string width;
frameHeight = int_of_string height;
left = int_of_string left;
top = int_of_string top;
delay = int_of_string delay}
| _ -> raise (Invalid_argument ("cTKtoCAMLgifFrame: " ^ s))
let cTKtoCAMLanimatedGif s =
match splitlist s with
| [width; height; frames; loop] ->
{frames = List.map cTKtoCAMLgifFrame (splitlist frames);
animWidth = int_of_string width;
animHeight = int_of_string height;
loop = int_of_string loop}
| _ -> raise (Invalid_argument ("cTKtoCAMLgifFrame: " ^ s))
(* check Tkanim package is in the interpreter *)
let available () =
let packages =
splitlist (Protocol.tkEval [| TkToken "package";
TkToken "names" |])
in
List.mem "Tkanim" packages
let create file =
let s =
Protocol.tkEval [| TkToken "animation";
TkToken "create";
TkToken file |]
in
let anmgif = cTKtoCAMLanimatedGif s in
match anmgif.frames with
| [] -> raise (TkError "Null frame in a gif ?")
| [x] -> Still (ImagePhoto x.imagephoto)
| _ -> Animated anmgif
let delete anim =
List.iter (fun {imagephoto = i} -> Imagephoto.delete i) anim.frames
let width anm = anm.animWidth
let height anm = anm.animHeight
let images anm = List.map (fun x -> x.imagephoto) anm.frames
let image_existence_check img =
(* I found there is a bug in Tk (even v8.0a2). *)
(* We can copy from deleted images, Tk never says "it doesn't exist", *)
(* But just do some operation. And sometimes it causes Seg-fault. *)
(* So, before using Imagephoto.copy, I should check the source image *)
(* really exists. *)
try ignore (Imagephoto.height img) with
TkError s -> prerr_endline ("tkanim: " ^ s); raise (TkError s)
let imagephoto_copy dst src opts =
image_existence_check src;
Imagephoto.copy dst src opts
let animate_gen w i anim =
let length = List.length anim.frames in
let frames = Array.of_list anim.frames in
let current = ref 0 in
let loop = ref anim.loop in
let f = frames.(!current) in
imagephoto_copy i f.imagephoto
[ImgTo (f.left, f.top, f.left + f.frameWidth,
f.top + f.frameHeight)];
let visible = ref true in
let animated = ref false in
let timer = ref None in
(* Loop *)
let display_current () =
let f = frames.(!current) in
imagephoto_copy i f.imagephoto
[ImgTo (f.left, f.top,
f.left + f.frameWidth, f.top + f.frameHeight)]
in
let rec tick () =
if not (Winfo.exists w && Winfo.viewable w) then begin
(* the widget is invisible. stop animation for efficiency *)
if !debug then prerr_endline "Stopped (Visibility)";
visible := false;
end else
begin
display_current ();
let t =
Timer.add (if f.delay = 0 then 100 else f.delay * 10)
(fun () ->
incr current;
if !current = length then begin
current := 0;
(* loop check *)
if !loop > 1 then begin
decr loop;
if !loop = 0 then begin
if !debug then prerr_endline "Loop end";
(* stop *)
loop := anim.loop;
timer := None
end
end
end;
tick ())
in
timer := Some t
end
in
let start () =
animated := true;
tick ()
in
let stop () =
match !timer with
| Some t ->
Timer.remove t;
timer := None;
animated := false
| None -> ()
in
let next () =
if !timer = None then begin
incr current;
if !current = length then current := 0;
display_current ()
end
in
(* We shouldn't delete the animation here. *)
(*
bind w [[], Destroy]
(BindSet ([], (fun _ -> Imagephoto.delete i)));
*)
bind w [[], Visibility]
(BindSet ([], (fun _ ->
if not !visible then begin
visible := true;
if !animated then start ()
end)));
(function
| false ->
if !animated then stop () else start ()
| true -> next ())
let animate label anim =
(* prerr_endline "animate"; *)
let i = Imagephoto.create [Width (Pixels anim.animWidth);
Height (Pixels anim.animHeight)]
in
bind label [[], Destroy] (BindExtend ([], (fun _ ->
Imagephoto.delete i)));
Label.configure label [ImagePhoto i];
animate_gen label i anim
let animate_canvas_item canvas tag anim =
(* prerr_endline "animate"; *)
let i = Imagephoto.create [Width (Pixels anim.animWidth);
Height (Pixels anim.animHeight)]
in
bind canvas [[], Destroy] (BindExtend ([], (fun _ ->
Imagephoto.delete i)));
Canvas.configure_image canvas tag [ImagePhoto i];
animate_gen canvas i anim
let gifdata s =
let tmp_dir = ref "/tmp" in
let mktemp =
let cnter = ref 0
and pid = Unix.getpid() in
(function prefx ->
incr cnter;
(Filename.concat !tmp_dir
(prefx ^ string_of_int pid ^ "." ^ string_of_int !cnter)))
in
let fname = mktemp "gifdata" in
let oc = open_out_bin fname in
try
output_string oc s;
close_out oc;
let anim = create fname in
Unix.unlink fname;
anim
with
e -> begin Unix.unlink fname; raise e end
|
