352 lines
11 KiB
C
352 lines
11 KiB
C
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/*
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* Copyright © 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_H_IN
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#error "Include <hb-ot.h> instead."
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#endif
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#ifndef HB_OT_LAYOUT_H
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#define HB_OT_LAYOUT_H
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#include "hb.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_BASE HB_TAG('B','A','S','E')
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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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#define HB_OT_TAG_JSTF HB_TAG('J','S','T','F')
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/*
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* GDEF
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*/
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HB_EXTERN hb_bool_t
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hb_ot_layout_has_glyph_classes (hb_face_t *face);
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typedef enum {
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HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED = 0,
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HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH = 1,
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HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE = 2,
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HB_OT_LAYOUT_GLYPH_CLASS_MARK = 3,
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HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT = 4
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} hb_ot_layout_glyph_class_t;
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HB_EXTERN 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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HB_EXTERN void
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hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
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hb_ot_layout_glyph_class_t klass,
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hb_set_t *glyphs /* OUT */);
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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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HB_EXTERN 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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HB_EXTERN unsigned int
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hb_ot_layout_get_ligature_carets (hb_font_t *font,
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hb_direction_t direction,
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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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hb_position_t *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 0xFFFFu
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#define HB_OT_LAYOUT_NO_FEATURE_INDEX 0xFFFFu
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#define HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX 0xFFFFu
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#define HB_OT_LAYOUT_NO_VARIATIONS_INDEX 0xFFFFFFFFu
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HB_EXTERN 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_EXTERN 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_EXTERN 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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hb_tag_t *chosen_script);
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HB_EXTERN 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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HB_EXTERN 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_EXTERN 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_EXTERN 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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HB_EXTERN hb_bool_t
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hb_ot_layout_language_get_required_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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unsigned int *feature_index,
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hb_tag_t *feature_tag);
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HB_EXTERN 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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HB_EXTERN 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_EXTERN 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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HB_EXTERN unsigned int
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hb_ot_layout_feature_get_lookups (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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HB_EXTERN unsigned int
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hb_ot_layout_table_get_lookup_count (hb_face_t *face,
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hb_tag_t table_tag);
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HB_EXTERN void
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hb_ot_layout_collect_features (hb_face_t *face,
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hb_tag_t table_tag,
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const hb_tag_t *scripts,
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const hb_tag_t *languages,
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const hb_tag_t *features,
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hb_set_t *feature_indexes /* OUT */);
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HB_EXTERN void
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hb_ot_layout_collect_lookups (hb_face_t *face,
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hb_tag_t table_tag,
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const hb_tag_t *scripts,
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const hb_tag_t *languages,
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const hb_tag_t *features,
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hb_set_t *lookup_indexes /* OUT */);
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HB_EXTERN void
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hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int lookup_index,
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hb_set_t *glyphs_before, /* OUT. May be NULL */
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hb_set_t *glyphs_input, /* OUT. May be NULL */
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hb_set_t *glyphs_after, /* OUT. May be NULL */
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hb_set_t *glyphs_output /* OUT. May be NULL */);
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#ifdef HB_NOT_IMPLEMENTED
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typedef struct
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{
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const hb_codepoint_t *before,
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unsigned int before_length,
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const hb_codepoint_t *input,
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unsigned int input_length,
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const hb_codepoint_t *after,
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unsigned int after_length,
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} hb_ot_layout_glyph_sequence_t;
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typedef hb_bool_t
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(*hb_ot_layout_glyph_sequence_func_t) (hb_font_t *font,
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hb_tag_t table_tag,
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unsigned int lookup_index,
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const hb_ot_layout_glyph_sequence_t *sequence,
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void *user_data);
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HB_EXTERN void
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Xhb_ot_layout_lookup_enumerate_sequences (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int lookup_index,
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hb_ot_layout_glyph_sequence_func_t callback,
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void *user_data);
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#endif
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/* Variations support */
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HB_EXTERN hb_bool_t
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hb_ot_layout_table_find_feature_variations (hb_face_t *face,
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hb_tag_t table_tag,
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const int *coords,
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unsigned int num_coords,
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unsigned int *variations_index /* out */);
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HB_EXTERN unsigned int
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hb_ot_layout_feature_with_variations_get_lookups (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 variations_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_EXTERN hb_bool_t
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hb_ot_layout_has_substitution (hb_face_t *face);
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HB_EXTERN hb_bool_t
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hb_ot_layout_lookup_would_substitute (hb_face_t *face,
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unsigned int lookup_index,
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const hb_codepoint_t *glyphs,
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unsigned int glyphs_length,
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hb_bool_t zero_context);
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HB_EXTERN void
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hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
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unsigned int lookup_index,
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hb_set_t *glyphs
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/*TODO , hb_bool_t inclusive */);
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HB_EXTERN void
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hb_ot_layout_lookups_substitute_closure (hb_face_t *face,
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const hb_set_t *lookups,
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hb_set_t *glyphs);
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#ifdef HB_NOT_IMPLEMENTED
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/* Note: You better have GDEF when using this API, or marks won't do much. */
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HB_EXTERN hb_bool_t
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Xhb_ot_layout_lookup_substitute (hb_font_t *font,
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unsigned int lookup_index,
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const hb_ot_layout_glyph_sequence_t *sequence,
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unsigned int out_size,
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hb_codepoint_t *glyphs_out, /* OUT */
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unsigned int *clusters_out, /* OUT */
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unsigned int *out_length /* OUT */);
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#endif
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/*
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* GPOS
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*/
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HB_EXTERN hb_bool_t
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hb_ot_layout_has_positioning (hb_face_t *face);
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#ifdef HB_NOT_IMPLEMENTED
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/* Note: You better have GDEF when using this API, or marks won't do much. */
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HB_EXTERN hb_bool_t
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Xhb_ot_layout_lookup_position (hb_font_t *font,
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unsigned int lookup_index,
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const hb_ot_layout_glyph_sequence_t *sequence,
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hb_glyph_position_t *positions /* IN / OUT */);
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#endif
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/* Optical 'size' feature info. Returns true if found.
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* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#size */
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HB_EXTERN hb_bool_t
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hb_ot_layout_get_size_params (hb_face_t *face,
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unsigned int *design_size, /* OUT. May be NULL */
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unsigned int *subfamily_id, /* OUT. May be NULL */
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unsigned int *subfamily_name_id, /* OUT. May be NULL */
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unsigned int *range_start, /* OUT. May be NULL */
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unsigned int *range_end /* OUT. May be NULL */);
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/*
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* BASE
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*/
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#if 0
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#define HB_OT_TAG_BASE_HANG HB_TAG('h','a','n','g')
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#define HB_OT_TAG_BASE_ICFB HB_TAG('i','c','f','b')
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#define HB_OT_TAG_BASE_ICFT HB_TAG('i','c','f','t')
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#define HB_OT_TAG_BASE_IDEO HB_TAG('i','d','e','o')
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#define HB_OT_TAG_BASE_IDTB HB_TAG('i','d','t','b')
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#define HB_OT_TAG_BASE_MATH HB_TAG('m','a','t','h')
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#define HB_OT_TAG_BASE_ROMN HB_TAG('r','o','m','n')
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#endif
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HB_END_DECLS
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#endif /* HB_OT_LAYOUT_H */
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