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