src/layer.h

   1 /* Copyright (c) 1995-2002
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  * Copyright (c) 1987 Oliver Laumann
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program (see the file COPYING); if not, see
  18  * http://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  20  *
  21  ****************************************************************
  22  * $Id$ FAU
  23  */
  24
  25 /*
  26  * This is the overlay structure. It is used to create a seperate
  27  * layer over the current windows.
  28  */
  29
  30 struct mchar;   /* forward declaration */
  31
  32 struct LayFuncs
  33 {
  34   void  (*lf_LayProcess) __P((char **, int *));
  35   void  (*lf_LayAbort) __P((void));
  36   void  (*lf_LayRedisplayLine) __P((int, int, int, int));
  37   void  (*lf_LayClearLine) __P((int, int, int, int));
  38   int   (*lf_LayRewrite) __P((int, int, int, struct mchar *, int));
  39   int   (*lf_LayResize) __P((int, int));
  40   void  (*lf_LayRestore) __P((void));
  41 };
  42
  43 struct layer
  44 {
  45   struct canvas *l_cvlist;      /* list of canvases displaying layer */
  46   int    l_width;
  47   int    l_height;
  48   int    l_x;                   /* cursor position */
  49   int    l_y;
  50   int    l_encoding;
  51   struct LayFuncs *l_layfn;
  52   char  *l_data;
  53
  54   struct layer *l_next;         /* layer stack, should be in data? */
  55   struct layer *l_bottom;       /* bottom element of layer stack */
  56   int    l_blocking;
  57 };
  58
  59 #define LayProcess              (*flayer->l_layfn->lf_LayProcess)
  60 #define LayAbort                (*flayer->l_layfn->lf_LayAbort)
  61 #define LayRedisplayLine        (*flayer->l_layfn->lf_LayRedisplayLine)
  62 #define LayClearLine            (*flayer->l_layfn->lf_LayClearLine)
  63 #define LayRewrite              (*flayer->l_layfn->lf_LayRewrite)
  64 #define LayResize               (*flayer->l_layfn->lf_LayResize)
  65 #define LayRestore              (*flayer->l_layfn->lf_LayRestore)
  66
  67 #define LaySetCursor()  LGotoPos(flayer, flayer->l_x, flayer->l_y)
  68 #define LayCanResize(l) (l->l_layfn->LayResize != DefResize)
  69
  70 /* XXX: AArgh! think again! */
  71
  72 #define LAY_CALL_UP(fn) do                              \
  73         {                                               \
  74           struct layer *oldlay = flayer;                \
  75           struct canvas *oldcvlist, *cv;                \
  76           debug("LayCallUp\n");                         \
  77           flayer = flayer->l_next;                      \
  78           oldcvlist = flayer->l_cvlist;                 \
  79           debug1("oldcvlist: %x\n", oldcvlist);         \
  80           flayer->l_cvlist = oldlay->l_cvlist;          \
  81           for (cv = flayer->l_cvlist; cv; cv = cv->c_lnext)     \
  82                 cv->c_layer = flayer;                   \
  83           fn;                                           \
  84           flayer = oldlay;                              \
  85           for (cv = flayer->l_cvlist; cv; cv = cv->c_lnext)     \
  86                 cv->c_layer = flayer;                   \
  87           flayer->l_next->l_cvlist = oldcvlist;         \
  88         } while(0)
  89
  90 #define LAY_DISPLAYS(l, fn) do                          \
  91         {                                               \
  92           struct display *olddisplay = display;         \
  93           struct canvas *cv;                            \
  94           for (display = displays; display; display = display->d_next) \
  95             {                                           \
  96               for (cv = D_cvlist; cv; cv = cv->c_next)  \
  97                 if (cv->c_layer == l)                   \
  98                   break;                                \
  99               if (cv == 0)                              \
 100                 continue;                               \
 101               fn;                                       \
 102             }                                           \
 103           display = olddisplay;                         \
 104         } while(0)
 105