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/* Things for GLYPHS and glyph tables.
Copyright (C) 1993 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Access the slots of a display-table, according to their purpose. */
#define DISP_TABLE_SIZE 262
#define DISP_TRUNC_GLYPH(dp) ((dp)->contents[256])
#define DISP_CONTINUE_GLYPH(dp) ((dp)->contents[257])
#define DISP_ESCAPE_GLYPH(dp) ((dp)->contents[258])
#define DISP_CTRL_GLYPH(dp) ((dp)->contents[259])
#define DISP_INVIS_VECTOR(dp) ((dp)->contents[260])
#define DISP_BORDER_GLYPH(dp) ((dp)->contents[261])
#define DISP_CHAR_VECTOR(dp, c) ((dp)->contents[c])
/* Defined in window.c. */
extern struct Lisp_Vector *window_display_table ();
/* Defined in indent.c. */
extern struct Lisp_Vector *buffer_display_table ();
/* Display table to use for vectors that don't specify their own. */
extern Lisp_Object Vstandard_display_table;
/* Vector of GLYPH definitions. Indexed by GLYPH number,
the contents are a string which is how to output the GLYPH. */
extern Lisp_Object Vglyph_table;
/* Return the current length of the GLYPH table,
or 0 if the table isn't currently valid. */
#define GLYPH_TABLE_LENGTH \
((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->size : 0)
/* Return the current base (for indexing) of the GLYPH table,
or 0 if the table isn't currently valid. */
#define GLYPH_TABLE_BASE \
((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->contents : 0)
/* Given BASE and LEN returned by the two previous macros,
return nonzero if the GLYPH code G should be output as a single
character with code G. Return zero if G has a string in the table. */
#define GLYPH_SIMPLE_P(base,len,g) ((g) >= (len) || !STRINGP (base[g]))
/* Given BASE and LEN returned by the two previous macros,
return nonzero if GLYPH code G is aliased to a different code. */
#define GLYPH_ALIAS_P(base,len,g) ((g) < (len) && INTEGERP (base[g]))
/* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 1,
return the alias for G. */
#define GLYPH_ALIAS(base, g) XINT (base[g])
/* Follow all aliases for G in the glyph table given by (BASE,
LENGTH), and set G to the final glyph. */
#define GLYPH_FOLLOW_ALIASES(base, length, g) \
while (GLYPH_ALIAS_P ((base), (length), (g))) \
(g) = GLYPH_ALIAS ((base), (g));
/* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 0,
return the length and the address of the character-sequence
used for outputting GLYPH G. */
#define GLYPH_LENGTH(base,g) XSTRING (base[g])->size
#define GLYPH_STRING(base,g) XSTRING (base[g])->data
/* GLYPH for a space character. */
#define SPACEGLYPH 040
#define NULL_GLYPH 00
#define GLYPH_FROM_CHAR(c) (c)
extern int glyphlen ();
extern void str_to_glyph_cpy ();
extern void str_to_glyph_ncpy ();
extern void glyph_to_str_cpy ();
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