503 lines
17 KiB
C++
503 lines
17 KiB
C++
/*
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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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#if !defined(HB_OT_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
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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-name.h"
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HB_BEGIN_DECLS
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/**
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* HB_OT_TAG_BASE:
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*
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* OpenType [Baseline Table](https://docs.microsoft.com/en-us/typography/opentype/spec/base).
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*/
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#define HB_OT_TAG_BASE HB_TAG('B','A','S','E')
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/**
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* HB_OT_TAG_GDEF:
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*
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* OpenType [Glyph Definition Table](https://docs.microsoft.com/en-us/typography/opentype/spec/gdef).
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*/
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#define HB_OT_TAG_GDEF HB_TAG('G','D','E','F')
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/**
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* HB_OT_TAG_GSUB:
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*
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* OpenType [Glyph Substitution Table](https://docs.microsoft.com/en-us/typography/opentype/spec/gsub).
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*/
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#define HB_OT_TAG_GSUB HB_TAG('G','S','U','B')
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/**
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* HB_OT_TAG_GPOS:
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*
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* OpenType [Glyph Positioning Table](https://docs.microsoft.com/en-us/typography/opentype/spec/gpos).
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*/
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#define HB_OT_TAG_GPOS HB_TAG('G','P','O','S')
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/**
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* HB_OT_TAG_JSTF:
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*
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* OpenType [Justification Table](https://docs.microsoft.com/en-us/typography/opentype/spec/jstf).
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*/
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#define HB_OT_TAG_JSTF HB_TAG('J','S','T','F')
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/*
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* Script & Language tags.
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*/
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/**
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* HB_OT_TAG_DEFAULT_SCRIPT:
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*
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* OpenType script tag, `DFLT`, for features that are not script-specific.
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*
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*/
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#define HB_OT_TAG_DEFAULT_SCRIPT HB_TAG ('D', 'F', 'L', 'T')
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/**
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* HB_OT_TAG_DEFAULT_LANGUAGE:
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*
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* OpenType language tag, `dflt`. Not a valid language tag, but some fonts
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* mistakenly use it.
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*/
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#define HB_OT_TAG_DEFAULT_LANGUAGE HB_TAG ('d', 'f', 'l', 't')
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/**
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* HB_OT_MAX_TAGS_PER_SCRIPT:
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*
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* Maximum number of OpenType tags that can correspond to a give #hb_script_t.
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*
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* Since: 2.0.0
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**/
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#define HB_OT_MAX_TAGS_PER_SCRIPT 3u
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/**
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* HB_OT_MAX_TAGS_PER_LANGUAGE:
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*
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* Maximum number of OpenType tags that can correspond to a give #hb_language_t.
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*
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* Since: 2.0.0
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**/
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#define HB_OT_MAX_TAGS_PER_LANGUAGE 3u
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HB_EXTERN void
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hb_ot_tags_from_script_and_language (hb_script_t script,
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hb_language_t language,
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unsigned int *script_count /* IN/OUT */,
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hb_tag_t *script_tags /* OUT */,
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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_script_t
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hb_ot_tag_to_script (hb_tag_t tag);
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HB_EXTERN hb_language_t
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hb_ot_tag_to_language (hb_tag_t tag);
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HB_EXTERN void
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hb_ot_tags_to_script_and_language (hb_tag_t script_tag,
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hb_tag_t language_tag,
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hb_script_t *script /* OUT */,
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hb_language_t *language /* OUT */);
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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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/**
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* hb_ot_layout_glyph_class_t:
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* @HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED: Glyphs not matching the other classifications
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* @HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH: Spacing, single characters, capable of accepting marks
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* @HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE: Glyphs that represent ligation of multiple characters
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* @HB_OT_LAYOUT_GLYPH_CLASS_MARK: Non-spacing, combining glyphs that represent marks
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* @HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT: Spacing glyphs that represent part of a single character
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*
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* The GDEF classes defined for glyphs.
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*
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**/
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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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/**
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* HB_OT_LAYOUT_NO_SCRIPT_INDEX:
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*
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* Special value for script index indicating unsupported script.
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*/
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#define HB_OT_LAYOUT_NO_SCRIPT_INDEX 0xFFFFu
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/**
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* HB_OT_LAYOUT_NO_FEATURE_INDEX:
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*
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* Special value for feature index indicating unsupported feature.
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*/
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#define HB_OT_LAYOUT_NO_FEATURE_INDEX 0xFFFFu
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/**
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* HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX:
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*
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* Special value for language index indicating default or unsupported language.
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*/
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#define HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX 0xFFFFu
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/**
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* HB_OT_LAYOUT_NO_VARIATIONS_INDEX:
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*
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* Special value for variations index indicating unsupported variation.
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*/
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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 /* OUT */);
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HB_EXTERN hb_bool_t
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hb_ot_layout_table_select_script (hb_face_t *face,
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hb_tag_t table_tag,
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unsigned int script_count,
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const hb_tag_t *script_tags,
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unsigned int *script_index /* OUT */,
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hb_tag_t *chosen_script /* OUT */);
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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_select_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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unsigned int language_count,
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const hb_tag_t *language_tags,
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unsigned int *language_index /* OUT */);
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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 /* OUT */);
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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 /* OUT */,
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hb_tag_t *feature_tag /* OUT */);
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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 /* OUT */);
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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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/* 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 unsigned
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hb_ot_layout_lookup_get_glyph_alternates (hb_face_t *face,
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unsigned lookup_index,
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hb_codepoint_t glyph,
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unsigned start_offset,
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unsigned *alternate_count /* IN/OUT */,
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hb_codepoint_t *alternate_glyphs /* OUT */);
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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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/*
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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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/* 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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hb_ot_name_id_t *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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HB_EXTERN hb_position_t
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hb_ot_layout_lookup_get_optical_bound (hb_font_t *font,
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unsigned lookup_index,
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hb_direction_t direction,
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hb_codepoint_t glyph);
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/*
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* GSUB/GPOS
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*/
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HB_EXTERN hb_bool_t
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hb_ot_layout_feature_get_name_ids (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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hb_ot_name_id_t *label_id /* OUT. May be NULL */,
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hb_ot_name_id_t *tooltip_id /* OUT. May be NULL */,
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hb_ot_name_id_t *sample_id /* OUT. May be NULL */,
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unsigned int *num_named_parameters /* OUT. May be NULL */,
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hb_ot_name_id_t *first_param_id /* OUT. May be NULL */);
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HB_EXTERN unsigned int
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hb_ot_layout_feature_get_characters (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 *char_count /* IN/OUT. May be NULL */,
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hb_codepoint_t *characters /* OUT. May be NULL */);
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/*
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* BASE
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*/
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/**
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* hb_ot_layout_baseline_tag_t:
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* @HB_OT_LAYOUT_BASELINE_TAG_ROMAN: The baseline used by alphabetic scripts such as Latin, Cyrillic and Greek.
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* In vertical writing mode, the alphabetic baseline for characters rotated 90 degrees clockwise.
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* (This would not apply to alphabetic characters that remain upright in vertical writing mode, since these
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* characters are not rotated.)
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* @HB_OT_LAYOUT_BASELINE_TAG_HANGING: The hanging baseline. In horizontal direction, this is the horizontal
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* line from which syllables seem, to hang in Tibetan and other similar scripts. In vertical writing mode,
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* for Tibetan (or some other similar script) characters rotated 90 degrees clockwise.
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* @HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT: Ideographic character face bottom or left edge,
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* if the direction is horizontal or vertical, respectively.
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* @HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT: Ideographic character face top or right edge,
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* if the direction is horizontal or vertical, respectively.
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* @HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_CENTRAL: The center of the ideographic character face. Since: 4.0.0
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* @HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT: Ideographic em-box bottom or left edge,
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* if the direction is horizontal or vertical, respectively.
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* @HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT: Ideographic em-box top or right edge baseline,
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* @HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL: The center of the ideographic em-box. Since: 4.0.0
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* if the direction is horizontal or vertical, respectively.
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* @HB_OT_LAYOUT_BASELINE_TAG_MATH: The baseline about which mathematical characters are centered.
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* In vertical writing mode when mathematical characters rotated 90 degrees clockwise, are centered.
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*
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* Baseline tags from [Baseline Tags](https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags) registry.
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*
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* Since: 2.6.0
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*/
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typedef enum {
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HB_OT_LAYOUT_BASELINE_TAG_ROMAN = HB_TAG ('r','o','m','n'),
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HB_OT_LAYOUT_BASELINE_TAG_HANGING = HB_TAG ('h','a','n','g'),
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HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT = HB_TAG ('i','c','f','b'),
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HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT = HB_TAG ('i','c','f','t'),
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HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_CENTRAL = HB_TAG ('I','c','f','c'),
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HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT = HB_TAG ('i','d','e','o'),
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HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT = HB_TAG ('i','d','t','p'),
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HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL = HB_TAG ('I','d','c','e'),
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HB_OT_LAYOUT_BASELINE_TAG_MATH = HB_TAG ('m','a','t','h'),
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/*< private >*/
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_HB_OT_LAYOUT_BASELINE_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
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} hb_ot_layout_baseline_tag_t;
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HB_EXTERN hb_ot_layout_baseline_tag_t
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hb_ot_layout_get_horizontal_baseline_tag_for_script (hb_script_t script);
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HB_EXTERN hb_bool_t
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hb_ot_layout_get_baseline (hb_font_t *font,
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hb_ot_layout_baseline_tag_t baseline_tag,
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hb_direction_t direction,
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hb_tag_t script_tag,
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hb_tag_t language_tag,
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hb_position_t *coord /* OUT. May be NULL. */);
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HB_EXTERN void
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hb_ot_layout_get_baseline_with_fallback (hb_font_t *font,
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hb_ot_layout_baseline_tag_t baseline_tag,
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hb_direction_t direction,
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hb_tag_t script_tag,
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hb_tag_t language_tag,
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hb_position_t *coord /* OUT */);
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HB_END_DECLS
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#endif /* HB_OT_LAYOUT_H */
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