1 /* catdvi - get text from DVI files
2    Copyright (C) 2000 Bjoern Brill <brill@fs.math.uni-frankfurt.de>
3 
4    This program is free software; you can redistribute it and/or modify
5    it under the terms of the GNU General Public License as published by
6    the Free Software Foundation; either version 2 of the License, or
7    (at your option) any later version.
8 
9    This program is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12    GNU General Public License for more details.
13 
14    You should have received a copy of the GNU General Public License
15    along with this program; if not, write to the Free Software
16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18 
19 
20 #ifndef GLYPHOPS_H
21 #define GLYPHOPS_H
22 
23 /* for definition of glyph_t */
24 #include "page.h"
25 
26 /* assorted magic with unicode characters ("glyphs")
27  */
28 
29 /* bit flags for certain possible properties of glyphs. useful as
30  * hints for correct rendering. Most are still unused.
31  */
32 enum glyph_hint_t {
33     GH_DIACRITIC =  	    1 <<  0,
34     GH_COMBINING =  	    1 <<  1,
35     GH_NON_SPACING =  	    1 <<  2,
36     GH_GRAPHIC =    	    1 <<  3,
37     GH_MATH = 	    	    1 <<  4,
38     GH_LIGATURE =   	    1 <<  5,
39     GH_ON_AXIS =    	    1 <<  6,
40     GH_EXTENSIBLE_RECIPE =  1 <<  7, /* TeX specific */
41     GH_WIDE_DIACRITIC =     1 <<  8,
42     GH_MOREMATH_LEFT =	    1 <<  9, /* e.g. for right math delimiters */
43     GH_RADICAL =     	    1 << 10
44 };
45 
46 #define GH_COMBINING_DIACRITIC (GH_DIACRITIC | GH_COMBINING | GH_NON_SPACING)
47 
48 /* set up internal tables used by the other functions */
49 void glyphops_init(void);
50 
51 /* returns our ORed wisdom abut the given glyph */
52 enum glyph_hint_t glyph_get_hint(glyph_t glyph);
53 
54 /* unicode knows two kinds of diacritics: combining diacritics are by
55  * themselves unprintable characters that change the meaning of the
56  * preceding glyph. spacing diacritics are printable (roughly
57  * equivalent to space followed by the corresponding combining diacritic).
58  *
59  * the following functions translate one into the other. idempotent.
60  * return zero on failure.
61  */
62 glyph_t diacritic_combining_variant(glyph_t diacritic);
63 glyph_t diacritic_spacing_variant(glyph_t diacritic);
64 
65 #endif
66