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https://github.com/love2d/megasource.git
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add harfbuzz library
This commit is contained in:
Sasha Szpakowski
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/*
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* Copyright © 2018 Google, 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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* Google Author(s): Rod Sheeter
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*/
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#ifndef HB_SUBSET_H
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#define HB_SUBSET_H
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#include "hb.h"
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HB_BEGIN_DECLS
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/**
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* hb_subset_input_t:
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*
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* Things that change based on the input. Characters to keep, etc.
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*/
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typedef struct hb_subset_input_t hb_subset_input_t;
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/**
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* hb_subset_plan_t:
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*
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* Contains information about how the subset operation will be executed.
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* Such as mappings from the old glyph ids to the new ones in the subset.
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*/
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typedef struct hb_subset_plan_t hb_subset_plan_t;
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/**
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* hb_subset_flags_t:
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* @HB_SUBSET_FLAGS_DEFAULT: all flags at their default value of false.
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* @HB_SUBSET_FLAGS_NO_HINTING: If set hinting instructions will be dropped in
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* the produced subset. Otherwise hinting instructions will be retained.
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* @HB_SUBSET_FLAGS_RETAIN_GIDS: If set glyph indices will not be modified in
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* the produced subset. If glyphs are dropped their indices will be retained
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* as an empty glyph.
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* @HB_SUBSET_FLAGS_DESUBROUTINIZE: If set and subsetting a CFF font the
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* subsetter will attempt to remove subroutines from the CFF glyphs.
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* @HB_SUBSET_FLAGS_NAME_LEGACY: If set non-unicode name records will be
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* retained in the subset.
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* @HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG: If set the subsetter will set the
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* OVERLAP_SIMPLE flag on each simple glyph.
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* @HB_SUBSET_FLAGS_PASSTHROUGH_UNRECOGNIZED: If set the subsetter will not
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* drop unrecognized tables and instead pass them through untouched.
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* @HB_SUBSET_FLAGS_NOTDEF_OUTLINE: If set the notdef glyph outline will be
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* retained in the final subset.
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* @HB_SUBSET_FLAGS_GLYPH_NAMES: If set the PS glyph names will be retained
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* in the final subset.
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* @HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES: If set then the unicode ranges in
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* OS/2 will not be recalculated.
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* @HB_SUBSET_FLAGS_PATCH_MODE: If set the subsetter behaviour will be modified
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* to produce a subset that is better suited to patching. For example cmap
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* subtable format will be kept stable.
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* @HB_SUBSET_FLAGS_OMIT_GLYF: If set the subsetter won't actually produce the final
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* glyf table bytes. The table directory will include and entry as if the table was
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* there but the actual final font blob will be truncated prior to the glyf data. This
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* is a useful performance optimization when a font aware binary patching algorithm
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* is being used to diff two subsets.
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*
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* List of boolean properties that can be configured on the subset input.
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*
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* Since: 2.9.0
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**/
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typedef enum { /*< flags >*/
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HB_SUBSET_FLAGS_DEFAULT = 0x00000000u,
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HB_SUBSET_FLAGS_NO_HINTING = 0x00000001u,
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HB_SUBSET_FLAGS_RETAIN_GIDS = 0x00000002u,
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HB_SUBSET_FLAGS_DESUBROUTINIZE = 0x00000004u,
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HB_SUBSET_FLAGS_NAME_LEGACY = 0x00000008u,
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HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG = 0x00000010u,
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HB_SUBSET_FLAGS_PASSTHROUGH_UNRECOGNIZED = 0x00000020u,
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HB_SUBSET_FLAGS_NOTDEF_OUTLINE = 0x00000040u,
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HB_SUBSET_FLAGS_GLYPH_NAMES = 0x00000080u,
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HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES = 0x00000100u,
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// Not supported yet: HB_SUBSET_FLAGS_PATCH_MODE = 0x00000200u,
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// Not supported yet: HB_SUBSET_FLAGS_OMIT_GLYF = 0x00000400u,
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} hb_subset_flags_t;
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/**
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* hb_subset_sets_t:
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* @HB_SUBSET_SETS_GLYPH_INDEX: the set of glyph indexes to retain in the subset.
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* @HB_SUBSET_SETS_UNICODE: the set of unicode codepoints to retain in the subset.
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* @HB_SUBSET_SETS_NO_SUBSET_TABLE_TAG: the set of table tags which specifies tables that should not be
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* subsetted.
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* @HB_SUBSET_SETS_DROP_TABLE_TAG: the set of table tags which specifies tables which will be dropped
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* in the subset.
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* @HB_SUBSET_SETS_NAME_ID: the set of name ids that will be retained.
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* @HB_SUBSET_SETS_NAME_LANG_ID: the set of name lang ids that will be retained.
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* @HB_SUBSET_SETS_LAYOUT_FEATURE_TAG: the set of layout feature tags that will be retained
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* in the subset.
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* @HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG: the set of layout script tags that will be retained
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* in the subset. Defaults to all tags. Since: 5.0.0
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*
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* List of sets that can be configured on the subset input.
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*
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* Since: 2.9.1
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**/
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typedef enum {
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HB_SUBSET_SETS_GLYPH_INDEX = 0,
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HB_SUBSET_SETS_UNICODE,
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HB_SUBSET_SETS_NO_SUBSET_TABLE_TAG,
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HB_SUBSET_SETS_DROP_TABLE_TAG,
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HB_SUBSET_SETS_NAME_ID,
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HB_SUBSET_SETS_NAME_LANG_ID,
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HB_SUBSET_SETS_LAYOUT_FEATURE_TAG,
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HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG,
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} hb_subset_sets_t;
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HB_EXTERN hb_subset_input_t *
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hb_subset_input_create_or_fail (void);
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HB_EXTERN hb_subset_input_t *
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hb_subset_input_reference (hb_subset_input_t *input);
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HB_EXTERN void
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hb_subset_input_destroy (hb_subset_input_t *input);
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HB_EXTERN hb_bool_t
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hb_subset_input_set_user_data (hb_subset_input_t *input,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy,
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hb_bool_t replace);
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HB_EXTERN void *
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hb_subset_input_get_user_data (const hb_subset_input_t *input,
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hb_user_data_key_t *key);
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HB_EXTERN hb_set_t *
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hb_subset_input_unicode_set (hb_subset_input_t *input);
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HB_EXTERN hb_set_t *
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hb_subset_input_glyph_set (hb_subset_input_t *input);
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HB_EXTERN hb_set_t *
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hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type);
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HB_EXTERN hb_subset_flags_t
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hb_subset_input_get_flags (hb_subset_input_t *input);
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HB_EXTERN void
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hb_subset_input_set_flags (hb_subset_input_t *input,
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unsigned value);
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#ifdef HB_EXPERIMENTAL_API
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#ifndef HB_NO_VAR
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HB_EXTERN hb_bool_t
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hb_subset_input_pin_axis_to_default (hb_subset_input_t *input,
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hb_face_t *face,
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hb_tag_t axis_tag);
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HB_EXTERN hb_bool_t
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hb_subset_input_pin_axis_location (hb_subset_input_t *input,
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hb_face_t *face,
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hb_tag_t axis_tag,
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float axis_value);
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#endif
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#endif
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#ifdef HB_EXPERIMENTAL_API
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HB_EXTERN hb_face_t *
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hb_subset_preprocess (hb_face_t *source);
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#endif
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HB_EXTERN hb_face_t *
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hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input);
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HB_EXTERN hb_face_t *
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hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan);
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HB_EXTERN hb_subset_plan_t *
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hb_subset_plan_create_or_fail (hb_face_t *face,
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const hb_subset_input_t *input);
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HB_EXTERN void
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hb_subset_plan_destroy (hb_subset_plan_t *plan);
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HB_EXTERN const hb_map_t*
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hb_subset_plan_old_to_new_glyph_mapping (const hb_subset_plan_t *plan);
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HB_EXTERN const hb_map_t*
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hb_subset_plan_new_to_old_glyph_mapping (const hb_subset_plan_t *plan);
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HB_EXTERN const hb_map_t*
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hb_subset_plan_unicode_to_old_glyph_mapping (const hb_subset_plan_t *plan);
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HB_EXTERN hb_subset_plan_t *
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hb_subset_plan_reference (hb_subset_plan_t *plan);
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HB_EXTERN hb_bool_t
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hb_subset_plan_set_user_data (hb_subset_plan_t *plan,
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hb_user_data_key_t *key,
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void *data,
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hb_destroy_func_t destroy,
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hb_bool_t replace);
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HB_EXTERN void *
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hb_subset_plan_get_user_data (const hb_subset_plan_t *plan,
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hb_user_data_key_t *key);
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HB_END_DECLS
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#endif /* HB_SUBSET_H */
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