src/dispextern.h

   1 /* Interface definitions for display code.
   2    Copyright (C) 1985, 1992 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs 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 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Nonzero means don't assume anything about current
  21    contents of actual terminal screen */
  22 extern int screen_garbaged;
  23
  24 /* Nonzero means last display completed and cursor is really at
  25    cursX, cursY.  Zero means it was preempted. */
  26 extern int display_completed;
  27
  28 #ifdef HAVE_X_WINDOWS
  29 struct run
  30 {
  31   int begin_run;
  32   int len;
  33   int face_code;                /* Also handles underlining. */
  34 };
  35 #endif
  36
  37 /* This structure is used for the actual display of text on a screen.
  38
  39    There are two instantiations of it:  the glyphs currently displayed,
  40    and the glyphs we desire to display.  The latter object is generated
  41    from buffers being displayed. */
  42
  43 struct screen_glyphs
  44   {
  45 #ifdef MULTI_SCREEN
  46     struct  screen *screen;     /* Screen these glyphs belong to. */
  47 #endif /* MULTI_SCREEN */
  48     int height;
  49     int width;
  50
  51     /* Contents of the screen.
  52        glyphs[V][H] is the glyph at position V, H.
  53        Note that glyphs[V][-1],
  54                  glyphs[V][used[V]],
  55              and glyphs[V][screen_width] are always '\0'.  */
  56     GLYPH **glyphs;
  57     /* long vector from which the strings in `glyphs' are taken.  */
  58     GLYPH *total_contents;
  59
  60     /* When representing a desired screen,
  61          enable[n] == 0 means that line n is same as current screen.
  62        When representing current screen contents,
  63          enable[n] == 0 means that line n is blank.  */
  64     char *enable;
  65
  66     /* Everything on line n after column used[n] is considered blank.  */
  67     int *used;
  68
  69     /* highlight[n] != 0 iff line n is highlighted.  */
  70     char *highlight;
  71
  72
  73     /* Buffer offset of this line's first char. */
  74     int   *bufp;
  75
  76 #ifdef HAVE_X_WINDOWS
  77     int *nruns;                 /* N runs of differently displayed text. */
  78     struct run **face_list;
  79     short *top_left_x;          /* Pixel position of top left corner */
  80     short *top_left_y;
  81     short *pix_width;           /* Pixel width of line. */
  82     short *pix_height;          /* Pixel height of line. */
  83 #endif  /* HAVE_X_WINDOWS */
  84   };
  85
  86 #if 0
  87 #define LINE_HEIGHT(s,n) (current_glyphs->pix_height[n])
  88 #define LINE_WIDTH(s,n) (current_glyphs->pix_width[n])
  89 #endif
  90
  91 #define LINE_HEIGHT(s,n) (FONT_HEIGHT((s)->display.x->font))
  92 #define LINE_WIDTH(s,n) (FONT_HEIGHT((s)->display.x->font) \
  93                          * SCREEN_CURRENT_GLYPHS(s)->enable[(n)])
  94
  95 extern void get_display_line ();