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/*
* Copyright (C) 2007,2008,2009 Red Hat, Inc.
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_LAYOUT_H
#define HB_OT_LAYOUT_H
#include "hb-common.h"
#include "hb-buffer.h"
#include "hb-font.h"
HB_BEGIN_DECLS
#define HB_OT_TAG_GDEF HB_TAG('G','D','E','F')
#define HB_OT_TAG_GSUB HB_TAG('G','S','U','B')
#define HB_OT_TAG_GPOS HB_TAG('G','P','O','S')
/*
* GDEF
*/
typedef enum {
HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED = 0x0000,
HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH = 0x0002,
HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE = 0x0004,
HB_OT_LAYOUT_GLYPH_CLASS_MARK = 0x0008,
HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT = 0x0010
} hb_ot_layout_glyph_class_t;
/* XXX These should eventually be removed as we move synthesized glyph
* classes in harfbuzz. */
hb_bool_t
hb_ot_layout_has_font_glyph_classes (hb_face_t *face);
hb_ot_layout_glyph_class_t
hb_ot_layout_get_glyph_class (hb_face_t *face,
hb_codepoint_t glyph);
void
hb_ot_layout_set_glyph_class (hb_face_t *face,
hb_codepoint_t glyph,
hb_ot_layout_glyph_class_t klass);
void
hb_ot_layout_build_glyph_classes (hb_face_t *face,
hb_codepoint_t *glyphs,
unsigned char *klasses,
uint16_t count);
/* Not that useful. Provides list of attach points for a glyph that a
* client may want to cache */
hb_bool_t
hb_ot_layout_get_attach_points (hb_face_t *face,
hb_codepoint_t glyph,
unsigned int *point_count /* IN/OUT */,
unsigned int *point_array /* OUT */);
/* Ligature caret positions */
hb_bool_t
hb_ot_layout_get_lig_carets (hb_face_t *face,
hb_font_t *font,
hb_codepoint_t glyph,
unsigned int *caret_count /* IN/OUT */,
int *caret_array /* OUT */);
/*
* GSUB/GPOS feature query and enumeration interface
*/
#define HB_OT_LAYOUT_NO_SCRIPT_INDEX ((unsigned int) 0xFFFF)
#define HB_OT_LAYOUT_NO_FEATURE_INDEX ((unsigned int) 0xFFFF)
#define HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX ((unsigned int) 0xFFFF)
#define HB_OT_LAYOUT_TAG_DEFAULT_SCRIPT HB_TAG ('D', 'F', 'L', 'T')
#define HB_OT_LAYOUT_TAG_DEFAULT_LANGUAGE HB_TAG ('d', 'f', 'l', 't')
hb_bool_t
hb_ot_layout_table_get_script_tags (hb_face_t *face,
hb_tag_t table_tag,
unsigned int *script_count /* IN/OUT */,
hb_tag_t *script_tags /* OUT */);
hb_bool_t
hb_ot_layout_table_find_script (hb_face_t *face,
hb_tag_t table_tag,
hb_tag_t script_tag,
unsigned int *script_index);
hb_bool_t
hb_ot_layout_table_get_feature_tags (hb_face_t *face,
hb_tag_t table_tag,
unsigned int *feature_count /* IN/OUT */,
hb_tag_t *feature_tags /* OUT */);
hb_bool_t
hb_ot_layout_script_get_language_tags (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int *language_count /* IN/OUT */,
hb_tag_t *language_tags /* OUT */);
hb_bool_t
hb_ot_layout_script_find_language (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
hb_tag_t language_tag,
unsigned int *language_index);
hb_bool_t
hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int language_index,
unsigned int *feature_index);
hb_bool_t
hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int language_index,
unsigned int *feature_count /* IN/OUT */,
unsigned int *feature_indexes /* OUT */);
hb_bool_t
hb_ot_layout_language_get_feature_tags (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int language_index,
unsigned int *feature_count /* IN/OUT */,
hb_tag_t *feature_tags /* OUT */);
hb_bool_t
hb_ot_layout_language_find_feature (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int language_index,
hb_tag_t feature_tag,
unsigned int *feature_index);
hb_bool_t
hb_ot_layout_feature_get_lookup_indexes (hb_face_t *face,
hb_tag_t table_tag,
unsigned int feature_index,
unsigned int *lookup_count /* IN/OUT */,
unsigned int *lookup_indexes /* OUT */);
/*
* GSUB
*/
hb_bool_t
hb_ot_layout_has_substitution (hb_face_t *face);
hb_bool_t
hb_ot_layout_substitute_lookup (hb_face_t *face,
hb_buffer_t *buffer,
unsigned int lookup_index,
hb_mask_t mask);
/*
* GPOS
*/
hb_bool_t
hb_ot_layout_has_positioning (hb_face_t *face);
hb_bool_t
hb_ot_layout_position_lookup (hb_face_t *face,
hb_font_t *font,
hb_buffer_t *buffer,
unsigned int lookup_index,
hb_mask_t mask);
HB_END_DECLS
#endif /* HB_OT_LAYOUT_H */
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