X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2FDEVEL%2Flablgtk%2Flablgtk_20001129-0.1.0%2Fexamples%2Fimage.ml;fp=helm%2FDEVEL%2Flablgtk%2Flablgtk_20001129-0.1.0%2Fexamples%2Fimage.ml;h=faf82cf4464c88f6bbd817ce9fdf27f0ed53c4e0;hb=7aa91a2cd4497f68ebf5b9dd85b5f2c791f738a1;hp=0000000000000000000000000000000000000000;hpb=044a71416237d8e2b575678b5f49b8c9380ca409;p=helm.git

diff --git a/helm/DEVEL/lablgtk/lablgtk_20001129-0.1.0/examples/image.ml b/helm/DEVEL/lablgtk/lablgtk_20001129-0.1.0/examples/image.ml
new file mode 100644
index 000000000..faf82cf44
--- /dev/null
+++ b/helm/DEVEL/lablgtk/lablgtk_20001129-0.1.0/examples/image.ml
@@ -0,0 +1,67 @@
+(* $Id$ *)
+
+open GMain
+open Gdk
+
+(* load image *)
+let buf = String.create (256*256*3)
+let ic = open_in_bin "image256x256.rgb"
+let _ = 
+  really_input ic ~buf:buf ~pos:0 ~len:(256*256*3);
+  close_in ic
+
+let rgb_at x y =
+  let offset = (y * 256 + x) * 3 in
+  (int_of_char buf.[offset  ],
+   int_of_char buf.[offset+1],
+   int_of_char buf.[offset+2])
+
+(* let id = Thread.create GtkThread.main () *)
+
+(* Choose a visual appropriate for RGB *)
+let _ =
+  Gdk.Rgb.init ();
+  GtkBase.Widget.set_default_visual (Gdk.Rgb.get_visual ());
+  GtkBase.Widget.set_default_colormap (Gdk.Rgb.get_cmap ())
+
+(* We need show: true because of the need of visual *)
+let window = GWindow.window ~show:true ~width: 256 ~height: 256 ()
+
+let visual = window#misc#visual
+
+let color_create = Truecolor.color_creator visual
+
+let w = window#misc#window
+let drawing = new GDraw.drawable w
+
+let _ =
+  window#connect#destroy ~callback:Main.quit;
+
+  let image =
+    Image.create ~kind: `FASTEST ~visual: visual ~width: 256 ~height: 256
+  in
+
+  let draw () =
+    for x = 0 to 255 do
+      for y = 0 to 255 do
+        let r,g,b = rgb_at x y in
+        Image.put_pixel image ~x: x ~y: y 
+          ~pixel: (color_create ~red: (r * 256) ~green: (g * 256) ~blue: (b * 256))
+      done
+    done 
+  in
+ 
+  let display () =
+    drawing#image image ~xsrc:0 ~ysrc:0 ~xdest:0 ~ydest:0 ~width:256 ~height:256
+  in
+
+  draw (); 
+
+  window#event#connect#after#expose ~callback:
+    begin fun _ ->
+      display (); false
+    end;
+  (* Thread.join id *)
+
+  window#show ();
+  Main.main ()