src/layer.h

   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  * $Id$ FAU
  28  */
  29
  30 /*
  31  * This is the overlay structure. It is used to create a seperate
  32  * layer over the current windows.
  33  */
  34
  35 struct mchar;   /* forward declaration */
  36
  37 struct LayFuncs
  38 {
  39   void  (*lf_LayProcess) __P((char **, int *));
  40   void  (*lf_LayAbort) __P((void));
  41   void  (*lf_LayRedisplayLine) __P((int, int, int, int));
  42   void  (*lf_LayClearLine) __P((int, int, int, int));
  43   int   (*lf_LayRewrite) __P((int, int, int, struct mchar *, int));
  44   int   (*lf_LayResize) __P((int, int));
  45   void  (*lf_LayRestore) __P((void));
  46 };
  47
  48 struct layer
  49 {
  50   struct canvas *l_cvlist;      /* list of canvases displaying layer */
  51   int    l_width;
  52   int    l_height;
  53   int    l_x;                   /* cursor position */
  54   int    l_y;
  55   int    l_encoding;
  56   struct LayFuncs *l_layfn;
  57   char  *l_data;
  58
  59   struct layer *l_next;         /* layer stack, should be in data? */
  60   struct layer *l_bottom;       /* bottom element of layer stack */
  61   int    l_blocking;
  62 };
  63
  64 #define LayProcess              (*flayer->l_layfn->lf_LayProcess)
  65 #define LayAbort                (*flayer->l_layfn->lf_LayAbort)
  66 #define LayRedisplayLine        (*flayer->l_layfn->lf_LayRedisplayLine)
  67 #define LayClearLine            (*flayer->l_layfn->lf_LayClearLine)
  68 #define LayRewrite              (*flayer->l_layfn->lf_LayRewrite)
  69 #define LayResize               (*flayer->l_layfn->lf_LayResize)
  70 #define LayRestore              (*flayer->l_layfn->lf_LayRestore)
  71
  72 #define LaySetCursor()  LGotoPos(flayer, flayer->l_x, flayer->l_y)
  73 #define LayCanResize(l) (l->l_layfn->LayResize != DefResize)
  74
  75 /* XXX: AArgh! think again! */
  76
  77 #define LAY_CALL_UP(fn) do                              \
  78         {                                               \
  79           struct layer *oldlay = flayer;                \
  80           struct canvas *oldcvlist, *cv;                \
  81           debug("LayCallUp\n");                         \
  82           flayer = flayer->l_next;                      \
  83           oldcvlist = flayer->l_cvlist;                 \
  84           debug1("oldcvlist: %x\n", oldcvlist);         \
  85           flayer->l_cvlist = oldlay->l_cvlist;          \
  86           for (cv = flayer->l_cvlist; cv; cv = cv->c_lnext)     \
  87                 cv->c_layer = flayer;                   \
  88           fn;                                           \
  89           flayer = oldlay;                              \
  90           for (cv = flayer->l_cvlist; cv; cv = cv->c_lnext)     \
  91                 cv->c_layer = flayer;                   \
  92           flayer->l_next->l_cvlist = oldcvlist;         \
  93         } while(0)
  94
  95 #define LAY_DISPLAYS(l, fn) do                          \
  96         {                                               \
  97           struct display *olddisplay = display;         \
  98           struct canvas *cv;                            \
  99           for (display = displays; display; display = display->d_next) \
 100             {                                           \
 101               for (cv = D_cvlist; cv; cv = cv->c_next)  \
 102                 if (cv->c_layer == l)                   \
 103                   break;                                \
 104               if (cv == 0)                              \
 105                 continue;                               \
 106               fn;                                       \
 107             }                                           \
 108           display = olddisplay;                         \
 109         } while(0)
 110