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+/* catdvi - get text from DVI files
+ Copyright (C) 2000 Bjoern Brill <brill@fs.math.uni-frankfurt.de>
+
+ This program 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 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+
+#ifndef GLYPHOPS_H
+#define GLYPHOPS_H
+
+/* for definition of glyph_t */
+#include "page.h"
+
+/* assorted magic with unicode characters ("glyphs")
+ */
+
+/* bit flags for certain possible properties of glyphs. useful as
+ * hints for correct rendering. Most are still unused.
+ */
+enum glyph_hint_t {
+ GH_DIACRITIC = 1 << 0,
+ GH_COMBINING = 1 << 1,
+ GH_NON_SPACING = 1 << 2,
+ GH_GRAPHIC = 1 << 3,
+ GH_MATH = 1 << 4,
+ GH_LIGATURE = 1 << 5,
+ GH_ON_AXIS = 1 << 6,
+ GH_EXTENSIBLE_RECIPE = 1 << 7, /* TeX specific */
+ GH_WIDE_DIACRITIC = 1 << 8,
+ GH_MOREMATH_LEFT = 1 << 9, /* e.g. for right math delimiters */
+ GH_RADICAL = 1 << 10
+};
+
+#define GH_COMBINING_DIACRITIC (GH_DIACRITIC | GH_COMBINING | GH_NON_SPACING)
+
+/* set up internal tables used by the other functions */
+void glyphops_init(void);
+
+/* returns our ORed wisdom abut the given glyph */
+enum glyph_hint_t glyph_get_hint(glyph_t glyph);
+
+/* unicode knows two kinds of diacritics: combining diacritics are by
+ * themselves unprintable characters that change the meaning of the
+ * preceding glyph. spacing diacritics are printable (roughly
+ * equivalent to space followed by the corresponding combining diacritic).
+ *
+ * the following functions translate one into the other. idempotent.
+ * return zero on failure.
+ */
+glyph_t diacritic_combining_variant(glyph_t diacritic);
+glyph_t diacritic_spacing_variant(glyph_t diacritic);
+
+#endif