src/disptab.h

   1 /* Things for GLYPHS and glyph tables.
   2    Copyright (C) 1993 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 1, 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 /* Access the slots of a display-table, according to their purpose.  */
  21
  22 #define DISP_TABLE_SIZE 261
  23 #define DISP_TRUNC_GLYPH(dp) ((dp)->contents[256])
  24 #define DISP_CONTINUE_GLYPH(dp) ((dp)->contents[257])
  25 #define DISP_ESCAPE_GLYPH(dp) ((dp)->contents[258])
  26 #define DISP_CTRL_GLYPH(dp) ((dp)->contents[259])
  27 #define DISP_INVIS_VECTOR(dp) ((dp)->contents[260])
  28 #define DISP_CHAR_VECTOR(dp, c) ((dp)->contents[c])
  29
  30 extern struct Lisp_Vector *window_display_table ();
  31
  32 /* Display table to use for vectors that don't specify their own.  */
  33 extern Lisp_Object Vstandard_display_table;
  34
  35 /* Vector of GLYPH definitions.  Indexed by GLYPH number,
  36    the contents are a string which is how to output the GLYPH.  */
  37 extern Lisp_Object Vglyph_table;
  38
  39 /* Return the current length of the GLYPH table,
  40    or 0 if the table isn't currently valid.  */
  41 #define GLYPH_TABLE_LENGTH  \
  42   ((XTYPE (Vglyph_table) == Lisp_Vector) \
  43    ? XVECTOR (Vglyph_table)->size : 0)
  44
  45 /* Return the current base (for indexing) of the GLYPH table,
  46    or 0 if the table isn't currently valid.  */
  47 #define GLYPH_TABLE_BASE  \
  48   ((XTYPE (Vglyph_table) == Lisp_Vector) \
  49    ? XVECTOR (Vglyph_table)->contents : 0)
  50
  51 /* Given BASE and LEN returned by the two previous macros,
  52    return nonzero if the GLYPH code G should be output as a single
  53    character with code G.  Return zero if G has a string in the table.  */
  54 #define GLYPH_SIMPLE_P(base,len,g)  \
  55   ((g) >= (len) || XTYPE (base[g]) != Lisp_String)
  56
  57 /* Given BASE and LEN returned by the two previous macros,
  58    return nonzero if GLYPH code G is aliased to a different code.  */
  59 #define GLYPH_ALIAS_P(base,len,g)  \
  60   ((g) < (len) && XTYPE (base[g]) == Lisp_Int)
  61
  62 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 1,
  63    return the alias for G.  */
  64 #define GLYPH_ALIAS(base, g) XINT (base[g])
  65
  66 /* Follow all aliases for G in the glyph table given by (BASE,
  67    LENGTH), and set G to the final glyph.  */
  68 #define GLYPH_FOLLOW_ALIASES(base, length, g)                           \
  69   while (GLYPH_ALIAS_P ((base), (length), (g)))                         \
  70     (g) = GLYPH_ALIAS ((base), (g));
  71
  72 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 0,
  73    return the length and the address of the character-sequence
  74    used for outputting GLYPH G.  */
  75 #define GLYPH_LENGTH(base,g)   XSTRING (base[g])->size
  76 #define GLYPH_STRING(base,g)   XSTRING (base[g])->data
  77
  78 /* GLYPH for a space character.  */
  79
  80 #define SPACEGLYPH 040
  81 #define NULL_GLYPH 00
  82
  83 #define GLYPH_FROM_CHAR(c) (c)
  84
  85 extern int glyphlen ();
  86 extern void str_to_glyph_cpy ();
  87 extern void str_to_glyph_ncpy ();
  88 extern void glyph_to_str_cpy ();