code.delx.au - gnu-emacs/blob - src/disptab.h

   1 /* Things for GLYPHS and glyph tables.
   2    Copyright (C) 1993, 2002, 2003, 2004, 2005,
   3                  2006 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* Access the slots of a display-table, according to their purpose.  */
  23
  24 #define DISP_TABLE_P(obj)                                                   \
  25   (CHAR_TABLE_P (obj)                                                       \
  26    && EQ (XCHAR_TABLE (obj)->purpose, Qdisplay_table)                       \
  27    && CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (obj)) == DISP_TABLE_EXTRA_SLOTS)
  28
  29 #define DISP_TABLE_EXTRA_SLOTS 6
  30 #define DISP_TRUNC_GLYPH(dp) ((dp)->extras[0])
  31 #define DISP_CONTINUE_GLYPH(dp) ((dp)->extras[1])
  32 #define DISP_ESCAPE_GLYPH(dp) ((dp)->extras[2])
  33 #define DISP_CTRL_GLYPH(dp) ((dp)->extras[3])
  34 #define DISP_INVIS_VECTOR(dp) ((dp)->extras[4])
  35 #define DISP_BORDER_GLYPH(dp) ((dp)->extras[5])
  36
  37 extern Lisp_Object disp_char_vector P_ ((struct Lisp_Char_Table *, int));
  38
  39 #define DISP_CHAR_VECTOR(dp, c) \
  40   (SINGLE_BYTE_CHAR_P(c) ? (dp)->contents[c] : disp_char_vector ((dp), (c)))
  41
  42 /* Defined in window.c.  */
  43 extern struct Lisp_Char_Table *window_display_table P_ ((struct window *));
  44
  45 /* Defined in indent.c.  */
  46 extern struct Lisp_Char_Table *buffer_display_table P_ ((void));
  47
  48 /* Display table to use for vectors that don't specify their own.  */
  49 extern Lisp_Object Vstandard_display_table;
  50
  51 /* This is the `purpose' slot of a display table.  */
  52 extern Lisp_Object Qdisplay_table;
  53
  54 /* Vector of GLYPH definitions.  Indexed by GLYPH number,
  55    the contents are a string which is how to output the GLYPH.  */
  56 extern Lisp_Object Vglyph_table;
  57
  58 /* Return the current length of the GLYPH table,
  59    or 0 if the table isn't currently valid.  */
  60 #define GLYPH_TABLE_LENGTH  \
  61   ((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->size : 0)
  62
  63 /* Return the current base (for indexing) of the GLYPH table,
  64    or 0 if the table isn't currently valid.  */
  65 #define GLYPH_TABLE_BASE  \
  66   ((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->contents : 0)
  67
  68 /* Given BASE and LEN returned by the two previous macros,
  69    return nonzero if the GLYPH code G should be output as a single
  70    character with code G.  Return zero if G has a string in the table.  */
  71 #define GLYPH_SIMPLE_P(base,len,g) ((g) >= (len) || !STRINGP (base[g]))
  72
  73 /* Given BASE and LEN returned by the two previous macros,
  74    return nonzero if GLYPH code G is aliased to a different code.  */
  75 #define GLYPH_ALIAS_P(base,len,g) ((g) < (len) && INTEGERP (base[g]))
  76
  77 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 1,
  78    return the alias for G.  */
  79 #define GLYPH_ALIAS(base, g) XINT (base[g])
  80
  81 /* Follow all aliases for G in the glyph table given by (BASE,
  82    LENGTH), and set G to the final glyph.  */
  83 #define GLYPH_FOLLOW_ALIASES(base, length, g)           \
  84   do {                                                  \
  85     while (GLYPH_ALIAS_P ((base), (length), (g)))       \
  86       (g) = GLYPH_ALIAS ((base), (g));                  \
  87     if (!GLYPH_CHAR_VALID_P (FAST_GLYPH_CHAR (g)))      \
  88       g = FAST_MAKE_GLYPH (' ', FAST_GLYPH_FACE (g));   \
  89   } while (0)
  90
  91 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 0,
  92    return the length and the address of the character-sequence
  93    used for outputting GLYPH G.  */
  94 #define GLYPH_LENGTH(base,g)   SCHARS (base[g])
  95 #define GLYPH_STRING(base,g)   SDATA (base[g])
  96
  97 /* GLYPH for a space character.  */
  98
  99 #define SPACEGLYPH 040
 100 #define NULL_GLYPH 00
 101
 102 #define GLYPH_FROM_CHAR(c) (c)
 103
 104 /* arch-tag: d7f792d2-f59c-4904-a91e-91522e3ab349
 105    (do not change this comment) */