src/viewport.c

   1 /* Copyright (c) 2008, 2009
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  *      Micah Cowan (micah@cowan.name)
   5  *      Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
   6  * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
   7  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   8  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   9  * Copyright (c) 1987 Oliver Laumann
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 3, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program (see the file COPYING); if not, see
  23  * http://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
  24  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  25  *
  26  ****************************************************************
  27  */
  28
  29 #include "config.h"
  30 #include "screen.h"
  31 #include "extern.h"
  32 #include "viewport.h"
  33
  34 extern struct display *display;
  35
  36 int
  37 RethinkDisplayViewports()
  38 {
  39   struct canvas *cv;
  40   struct viewport *vp, *vpn;
  41
  42   /* free old viewports */
  43   for (cv = display->d_cvlist; cv; cv = cv->c_next)
  44     {
  45       for (vp = cv->c_vplist; vp; vp = vpn)
  46         {
  47           vp->v_canvas = 0;
  48           vpn = vp->v_next;
  49           bzero((char *)vp, sizeof(*vp));
  50           free(vp);
  51         }
  52       cv->c_vplist = 0;
  53     }
  54   display->d_vpxmin = -1;
  55   display->d_vpxmax = -1;
  56
  57   for (cv = display->d_cvlist; cv; cv = cv->c_next)
  58     {
  59       if ((vp = (struct viewport *)malloc(sizeof *vp)) == 0)
  60         return -1;
  61 #ifdef HOLE
  62       vp->v_canvas = cv;
  63       vp->v_xs = cv->c_xs;
  64       vp->v_ys = (cv->c_ys + cv->c_ye) / 2;
  65       vp->v_xe = cv->c_xe;
  66       vp->v_ye = cv->c_ye;
  67       vp->v_xoff = cv->c_xoff;
  68       vp->v_yoff = cv->c_yoff;
  69       vp->v_next = cv->c_vplist;
  70       cv->c_vplist = vp;
  71
  72       if ((vp = (struct viewport *)malloc(sizeof *vp)) == 0)
  73         return -1;
  74       vp->v_canvas = cv;
  75       vp->v_xs = (cv->c_xs + cv->c_xe) / 2;
  76       vp->v_ys = (3 * cv->c_ys + cv->c_ye) / 4;
  77       vp->v_xe = cv->c_xe;
  78       vp->v_ye = (cv->c_ys + cv->c_ye) / 2 - 1;
  79       vp->v_xoff = cv->c_xoff;
  80       vp->v_yoff = cv->c_yoff;
  81       vp->v_next = cv->c_vplist;
  82       cv->c_vplist = vp;
  83
  84       if ((vp = (struct viewport *)malloc(sizeof *vp)) == 0)
  85         return -1;
  86       vp->v_canvas = cv;
  87       vp->v_xs = cv->c_xs;
  88       vp->v_ys = (3 * cv->c_ys + cv->c_ye) / 4;
  89       vp->v_xe = (3 * cv->c_xs + cv->c_xe) / 4 - 1;
  90       vp->v_ye = (cv->c_ys + cv->c_ye) / 2 - 1;
  91       vp->v_xoff = cv->c_xoff;
  92       vp->v_yoff = cv->c_yoff;
  93       vp->v_next = cv->c_vplist;
  94       cv->c_vplist = vp;
  95
  96       if ((vp = (struct viewport *)malloc(sizeof *vp)) == 0)
  97         return -1;
  98       vp->v_canvas = cv;
  99       vp->v_xs = cv->c_xs;
 100       vp->v_ys = cv->c_ys;
 101       vp->v_xe = cv->c_xe;
 102       vp->v_ye = (3 * cv->c_ys + cv->c_ye) / 4 - 1;
 103       vp->v_xoff = cv->c_xoff;
 104       vp->v_yoff = cv->c_yoff;
 105       vp->v_next = cv->c_vplist;
 106       cv->c_vplist = vp;
 107 #else
 108       vp->v_canvas = cv;
 109       vp->v_xs = cv->c_xs;
 110       vp->v_ys = cv->c_ys;
 111       vp->v_xe = cv->c_xe;
 112       vp->v_ye = cv->c_ye;
 113       vp->v_xoff = cv->c_xoff;
 114       vp->v_yoff = cv->c_yoff;
 115       vp->v_next = cv->c_vplist;
 116       cv->c_vplist = vp;
 117 #endif
 118
 119       if (cv->c_xs < display->d_vpxmin || display->d_vpxmin == -1)
 120         display->d_vpxmin = cv->c_xs;
 121       if (cv->c_xe > display->d_vpxmax || display->d_vpxmax == -1)
 122         display->d_vpxmax = cv->c_xe;
 123     }
 124   return 0;
 125 }
 126
 127 void
 128 RethinkViewportOffsets(cv)
 129 struct canvas *cv;
 130 {
 131   struct viewport *vp;
 132
 133   for (vp = cv->c_vplist; vp; vp = vp->v_next)
 134     {
 135       vp->v_xoff = cv->c_xoff;
 136       vp->v_yoff = cv->c_yoff;
 137     }
 138 }
 139
 140