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harfbuzz/src/hb-subset.h

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/*
* Copyright © 2018 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Rod Sheeter
*/
#ifndef HB_SUBSET_H
#define HB_SUBSET_H
#include "hb.h"
#include "hb-ot.h"
HB_BEGIN_DECLS
/**
* hb_subset_input_t:
*
* Things that change based on the input. Characters to keep, etc.
*/
typedef struct hb_subset_input_t hb_subset_input_t;
/**
* hb_subset_plan_t:
*
* Contains information about how the subset operation will be executed.
* Such as mappings from the old glyph ids to the new ones in the subset.
*/
typedef struct hb_subset_plan_t hb_subset_plan_t;
/**
* hb_subset_flags_t:
* @HB_SUBSET_FLAGS_DEFAULT: all flags at their default value of false.
* @HB_SUBSET_FLAGS_NO_HINTING: If set hinting instructions will be dropped in
* the produced subset. Otherwise hinting instructions will be retained.
* @HB_SUBSET_FLAGS_RETAIN_GIDS: If set glyph indices will not be modified in
* the produced subset. If glyphs are dropped their indices will be retained
* as an empty glyph.
* @HB_SUBSET_FLAGS_DESUBROUTINIZE: If set and subsetting a CFF font the
* subsetter will attempt to remove subroutines from the CFF glyphs.
* @HB_SUBSET_FLAGS_NAME_LEGACY: If set non-unicode name records will be
* retained in the subset.
* @HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG: If set the subsetter will set the
* OVERLAP_SIMPLE flag on each simple glyph.
* @HB_SUBSET_FLAGS_PASSTHROUGH_UNRECOGNIZED: If set the subsetter will not
* drop unrecognized tables and instead pass them through untouched.
* @HB_SUBSET_FLAGS_NOTDEF_OUTLINE: If set the notdef glyph outline will be
* retained in the final subset.
* @HB_SUBSET_FLAGS_GLYPH_NAMES: If set the PS glyph names will be retained
* in the final subset.
* @HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES: If set then the unicode ranges in
* OS/2 will not be recalculated.
* @HB_SUBSET_FLAGS_PATCH_MODE: If set the subsetter behaviour will be modified
* to produce a subset that is better suited to patching. For example cmap
* subtable format will be kept stable.
* @HB_SUBSET_FLAGS_OMIT_GLYF: If set the subsetter won't actually produce the final
* glyf table bytes. The table directory will include and entry as if the table was
* there but the actual final font blob will be truncated prior to the glyf data. This
* is a useful performance optimization when a font aware binary patching algorithm
* is being used to diff two subsets.
*
* List of boolean properties that can be configured on the subset input.
*
* Since: 2.9.0
**/
typedef enum { /*< flags >*/
HB_SUBSET_FLAGS_DEFAULT = 0x00000000u,
HB_SUBSET_FLAGS_NO_HINTING = 0x00000001u,
HB_SUBSET_FLAGS_RETAIN_GIDS = 0x00000002u,
HB_SUBSET_FLAGS_DESUBROUTINIZE = 0x00000004u,
HB_SUBSET_FLAGS_NAME_LEGACY = 0x00000008u,
HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG = 0x00000010u,
HB_SUBSET_FLAGS_PASSTHROUGH_UNRECOGNIZED = 0x00000020u,
HB_SUBSET_FLAGS_NOTDEF_OUTLINE = 0x00000040u,
HB_SUBSET_FLAGS_GLYPH_NAMES = 0x00000080u,
HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES = 0x00000100u,
// Not supported yet: HB_SUBSET_FLAGS_PATCH_MODE = 0x00000200u,
// Not supported yet: HB_SUBSET_FLAGS_OMIT_GLYF = 0x00000400u,
} hb_subset_flags_t;
/**
* hb_subset_sets_t:
* @HB_SUBSET_SETS_GLYPH_INDEX: the set of glyph indexes to retain in the subset.
* @HB_SUBSET_SETS_UNICODE: the set of unicode codepoints to retain in the subset.
* @HB_SUBSET_SETS_NO_SUBSET_TABLE_TAG: the set of table tags which specifies tables that should not be
* subsetted.
* @HB_SUBSET_SETS_DROP_TABLE_TAG: the set of table tags which specifies tables which will be dropped
* in the subset.
* @HB_SUBSET_SETS_NAME_ID: the set of name ids that will be retained.
* @HB_SUBSET_SETS_NAME_LANG_ID: the set of name lang ids that will be retained.
* @HB_SUBSET_SETS_LAYOUT_FEATURE_TAG: the set of layout feature tags that will be retained
* in the subset.
* @HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG: the set of layout script tags that will be retained
* in the subset. Defaults to all tags. Since: 5.0.0
*
* List of sets that can be configured on the subset input.
*
* Since: 2.9.1
**/
typedef enum {
HB_SUBSET_SETS_GLYPH_INDEX = 0,
HB_SUBSET_SETS_UNICODE,
HB_SUBSET_SETS_NO_SUBSET_TABLE_TAG,
HB_SUBSET_SETS_DROP_TABLE_TAG,
HB_SUBSET_SETS_NAME_ID,
HB_SUBSET_SETS_NAME_LANG_ID,
HB_SUBSET_SETS_LAYOUT_FEATURE_TAG,
HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG,
} hb_subset_sets_t;
HB_EXTERN hb_subset_input_t *
hb_subset_input_create_or_fail (void);
HB_EXTERN hb_subset_input_t *
hb_subset_input_reference (hb_subset_input_t *input);
HB_EXTERN void
hb_subset_input_destroy (hb_subset_input_t *input);
HB_EXTERN hb_bool_t
hb_subset_input_set_user_data (hb_subset_input_t *input,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy,
hb_bool_t replace);
HB_EXTERN void *
hb_subset_input_get_user_data (const hb_subset_input_t *input,
hb_user_data_key_t *key);
HB_EXTERN hb_set_t *
hb_subset_input_unicode_set (hb_subset_input_t *input);
HB_EXTERN hb_set_t *
hb_subset_input_glyph_set (hb_subset_input_t *input);
HB_EXTERN hb_set_t *
hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type);
HB_EXTERN hb_subset_flags_t
hb_subset_input_get_flags (hb_subset_input_t *input);
HB_EXTERN void
hb_subset_input_set_flags (hb_subset_input_t *input,
unsigned value);
HB_EXTERN hb_bool_t
hb_subset_input_pin_axis_to_default (hb_subset_input_t *input,
hb_face_t *face,
hb_tag_t axis_tag);
HB_EXTERN hb_bool_t
hb_subset_input_pin_axis_location (hb_subset_input_t *input,
hb_face_t *face,
hb_tag_t axis_tag,
float axis_value);
#ifdef HB_EXPERIMENTAL_API
HB_EXTERN hb_bool_t
hb_subset_input_override_name_table (hb_subset_input_t *input,
hb_ot_name_id_t name_id,
unsigned platform_id,
unsigned encoding_id,
unsigned language_id,
const char *name_str,
int str_len);
#endif
HB_EXTERN hb_face_t *
hb_subset_preprocess (hb_face_t *source);
HB_EXTERN hb_face_t *
hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input);
HB_EXTERN hb_face_t *
hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan);
HB_EXTERN hb_subset_plan_t *
hb_subset_plan_create_or_fail (hb_face_t *face,
const hb_subset_input_t *input);
HB_EXTERN void
hb_subset_plan_destroy (hb_subset_plan_t *plan);
HB_EXTERN const hb_map_t*
hb_subset_plan_old_to_new_glyph_mapping (const hb_subset_plan_t *plan);
HB_EXTERN const hb_map_t*
hb_subset_plan_new_to_old_glyph_mapping (const hb_subset_plan_t *plan);
HB_EXTERN const hb_map_t*
hb_subset_plan_unicode_to_old_glyph_mapping (const hb_subset_plan_t *plan);
HB_EXTERN hb_subset_plan_t *
hb_subset_plan_reference (hb_subset_plan_t *plan);
HB_EXTERN hb_bool_t
hb_subset_plan_set_user_data (hb_subset_plan_t *plan,
hb_user_data_key_t *key,
void *data,
hb_destroy_func_t destroy,
hb_bool_t replace);
HB_EXTERN void *
hb_subset_plan_get_user_data (const hb_subset_plan_t *plan,
hb_user_data_key_t *key);
HB_END_DECLS
#endif /* HB_SUBSET_H */
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