l4/pkg/ocaml/contrib/otherlibs/graph/image.c

   1 /***********************************************************************/
   2 /*                                                                     */
   3 /*                           Objective Caml                            */
   4 /*                                                                     */
   5 /*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         */
   6 /*                                                                     */
   7 /*  Copyright 1996 Institut National de Recherche en Informatique et   */
   8 /*  en Automatique.  All rights reserved.  This file is distributed    */
   9 /*  under the terms of the GNU Library General Public License, with    */
  10 /*  the special exception on linking described in file ../../LICENSE.  */
  11 /*                                                                     */
  12 /***********************************************************************/
  13
  14 /* $Id: image.c 6171 2004-03-24 15:02:06Z starynke $ */
  15
  16 #include "libgraph.h"
  17 #include "image.h"
  18 #include <alloc.h>
  19 #include <custom.h>
  20
  21 static void caml_gr_free_image(value im)
  22 {
  23   XFreePixmap(caml_gr_display, Data_im(im));
  24   if (Mask_im(im) != None) XFreePixmap(caml_gr_display, Mask_im(im));
  25 }
  26
  27 static struct custom_operations image_ops = {
  28   "_image",
  29   caml_gr_free_image,
  30   custom_compare_default,
  31   custom_hash_default,
  32   custom_serialize_default,
  33   custom_deserialize_default
  34 };
  35
  36 #define Max_image_mem 2000000
  37
  38 value caml_gr_new_image(int w, int h)
  39 {
  40   value res = alloc_custom(&image_ops, sizeof(struct grimage),
  41                            w * h, Max_image_mem);
  42   Width_im(res) = w;
  43   Height_im(res) = h;
  44   Data_im(res) = XCreatePixmap(caml_gr_display, caml_gr_window.win, w, h,
  45                                XDefaultDepth(caml_gr_display, caml_gr_screen));
  46   Mask_im(res) = None;
  47   return res;
  48 }
  49
  50 value caml_gr_create_image(value vw, value vh)
  51 {
  52   caml_gr_check_open();
  53   return caml_gr_new_image(Int_val(vw), Int_val(vh));
  54 }
  55
  56 value caml_gr_blit_image(value im, value vx, value vy)
  57 {
  58   int x = Int_val(vx);
  59   int y = Int_val(vy);
  60   caml_gr_check_open();
  61   XCopyArea(caml_gr_display, caml_gr_bstore.win, Data_im(im), caml_gr_bstore.gc,
  62             x, Bcvt(y) + 1 - Height_im(im),
  63             Width_im(im), Height_im(im),
  64             0, 0);
  65   return Val_unit;
  66 }
  67
  68 value caml_gr_draw_image(value im, value vx, value vy)
  69 {
  70   int x = Int_val(vx);
  71   int y = Int_val(vy);
  72   int wy = Wcvt(y) + 1 - Height_im(im);
  73   int by = Bcvt(y) + 1 - Height_im(im);
  74
  75   caml_gr_check_open();
  76   if (Mask_im(im) != None) {
  77     if(caml_gr_remember_modeflag) {
  78       XSetClipOrigin(caml_gr_display, caml_gr_bstore.gc, x, by);
  79       XSetClipMask(caml_gr_display, caml_gr_bstore.gc, Mask_im(im));
  80     }
  81     if(caml_gr_display_modeflag) {
  82       XSetClipOrigin(caml_gr_display, caml_gr_window.gc, x, wy);
  83       XSetClipMask(caml_gr_display, caml_gr_window.gc, Mask_im(im));
  84     }
  85   }
  86   if(caml_gr_remember_modeflag)
  87     XCopyArea(caml_gr_display, Data_im(im), caml_gr_bstore.win, caml_gr_bstore.gc,
  88               0, 0,
  89               Width_im(im), Height_im(im),
  90               x, by);
  91   if(caml_gr_display_modeflag)
  92     XCopyArea(caml_gr_display, Data_im(im), caml_gr_window.win, caml_gr_window.gc,
  93           0, 0,
  94           Width_im(im), Height_im(im),
  95           x, wy);
  96   if (Mask_im(im) != None) {
  97     if(caml_gr_remember_modeflag)
  98       XSetClipMask(caml_gr_display, caml_gr_bstore.gc, None);
  99     if(caml_gr_display_modeflag)
 100       XSetClipMask(caml_gr_display, caml_gr_window.gc, None);
 101   }
 102   if(caml_gr_display_modeflag)
 103     XFlush(caml_gr_display);
 104   return Val_unit;
 105 }
 106
 107 /* eof $Id: image.c 6171 2004-03-24 15:02:06Z starynke $ */