src/hb-subset-input.cc - third_party/harfbuzz - Git at Google

 /*
  * 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): Garret Rieger, Rod Sheeter, Behdad Esfahbod
  */

 #include "hb-subset.hh"
 #include "hb-set.hh"

 /**
  * hb_subset_input_create_or_fail:
  *
  * Creates a new subset input object.
  *
  * Return value: (transfer full): New subset input, or %NULL if failed. Destroy
  * with hb_subset_input_destroy().
  *
  * Since: 1.8.0
  **/
 hb_subset_input_t *
 hb_subset_input_create_or_fail (void)
 {
   hb_subset_input_t *input = hb_object_create<hb_subset_input_t>();

   if (unlikely (!input))
     return nullptr;

   for (auto& set : input->sets_iter ())
     set = hb_set_create ();

   if (input->in_error ())
   {
     hb_subset_input_destroy (input);
     return nullptr;
   }

   input->flags = HB_SUBSET_FLAGS_DEFAULT;

   hb_set_add_range (input->sets.name_ids, 0, 6);
   hb_set_add (input->sets.name_languages, 0x0409);

   hb_tag_t default_drop_tables[] = {
     // Layout disabled by default
     HB_TAG ('m', 'o', 'r', 'x'),
     HB_TAG ('m', 'o', 'r', 't'),
     HB_TAG ('k', 'e', 'r', 'x'),
     HB_TAG ('k', 'e', 'r', 'n'),

     // Copied from fontTools:
     HB_TAG ('B', 'A', 'S', 'E'),
     HB_TAG ('J', 'S', 'T', 'F'),
     HB_TAG ('D', 'S', 'I', 'G'),
     HB_TAG ('E', 'B', 'D', 'T'),
     HB_TAG ('E', 'B', 'L', 'C'),
     HB_TAG ('E', 'B', 'S', 'C'),
     HB_TAG ('S', 'V', 'G', ' '),
     HB_TAG ('P', 'C', 'L', 'T'),
     HB_TAG ('L', 'T', 'S', 'H'),
     // Graphite tables
     HB_TAG ('F', 'e', 'a', 't'),
     HB_TAG ('G', 'l', 'a', 't'),
     HB_TAG ('G', 'l', 'o', 'c'),
     HB_TAG ('S', 'i', 'l', 'f'),
     HB_TAG ('S', 'i', 'l', 'l'),
   };
   input->sets.drop_tables->add_array (default_drop_tables, ARRAY_LENGTH (default_drop_tables));

   hb_tag_t default_no_subset_tables[] = {
     HB_TAG ('a', 'v', 'a', 'r'),
     HB_TAG ('f', 'v', 'a', 'r'),
     HB_TAG ('g', 'a', 's', 'p'),
     HB_TAG ('c', 'v', 't', ' '),
     HB_TAG ('f', 'p', 'g', 'm'),
     HB_TAG ('p', 'r', 'e', 'p'),
     HB_TAG ('V', 'D', 'M', 'X'),
     HB_TAG ('D', 'S', 'I', 'G'),
     HB_TAG ('M', 'V', 'A', 'R'),
     HB_TAG ('c', 'v', 'a', 'r'),
     HB_TAG ('S', 'T', 'A', 'T'),
   };
   input->sets.no_subset_tables->add_array (default_no_subset_tables,
                                          ARRAY_LENGTH (default_no_subset_tables));

   //copied from _layout_features_groups in fonttools
   hb_tag_t default_layout_features[] = {
     // default shaper
     // common
     HB_TAG ('r', 'v', 'r', 'n'),
     HB_TAG ('c', 'c', 'm', 'p'),
     HB_TAG ('l', 'i', 'g', 'a'),
     HB_TAG ('l', 'o', 'c', 'l'),
     HB_TAG ('m', 'a', 'r', 'k'),
     HB_TAG ('m', 'k', 'm', 'k'),
     HB_TAG ('r', 'l', 'i', 'g'),

     //fractions
     HB_TAG ('f', 'r', 'a', 'c'),
     HB_TAG ('n', 'u', 'm', 'r'),
     HB_TAG ('d', 'n', 'o', 'm'),

     //horizontal
     HB_TAG ('c', 'a', 'l', 't'),
     HB_TAG ('c', 'l', 'i', 'g'),
     HB_TAG ('c', 'u', 'r', 's'),
     HB_TAG ('k', 'e', 'r', 'n'),
     HB_TAG ('r', 'c', 'l', 't'),

     //vertical
     HB_TAG ('v', 'a', 'l', 't'),
     HB_TAG ('v', 'e', 'r', 't'),
     HB_TAG ('v', 'k', 'r', 'n'),
     HB_TAG ('v', 'p', 'a', 'l'),
     HB_TAG ('v', 'r', 't', '2'),

     //ltr
     HB_TAG ('l', 't', 'r', 'a'),
     HB_TAG ('l', 't', 'r', 'm'),

     //rtl
     HB_TAG ('r', 't', 'l', 'a'),
     HB_TAG ('r', 't', 'l', 'm'),

     //Complex shapers
     //arabic
     HB_TAG ('i', 'n', 'i', 't'),
     HB_TAG ('m', 'e', 'd', 'i'),
     HB_TAG ('f', 'i', 'n', 'a'),
     HB_TAG ('i', 's', 'o', 'l'),
     HB_TAG ('m', 'e', 'd', '2'),
     HB_TAG ('f', 'i', 'n', '2'),
     HB_TAG ('f', 'i', 'n', '3'),
     HB_TAG ('c', 's', 'w', 'h'),
     HB_TAG ('m', 's', 'e', 't'),
     HB_TAG ('s', 't', 'c', 'h'),

     //hangul
     HB_TAG ('l', 'j', 'm', 'o'),
     HB_TAG ('v', 'j', 'm', 'o'),
     HB_TAG ('t', 'j', 'm', 'o'),

     //tibetan
     HB_TAG ('a', 'b', 'v', 's'),
     HB_TAG ('b', 'l', 'w', 's'),
     HB_TAG ('a', 'b', 'v', 'm'),
     HB_TAG ('b', 'l', 'w', 'm'),

     //indic
     HB_TAG ('n', 'u', 'k', 't'),
     HB_TAG ('a', 'k', 'h', 'n'),
     HB_TAG ('r', 'p', 'h', 'f'),
     HB_TAG ('r', 'k', 'r', 'f'),
     HB_TAG ('p', 'r', 'e', 'f'),
     HB_TAG ('b', 'l', 'w', 'f'),
     HB_TAG ('h', 'a', 'l', 'f'),
     HB_TAG ('a', 'b', 'v', 'f'),
     HB_TAG ('p', 's', 't', 'f'),
     HB_TAG ('c', 'f', 'a', 'r'),
     HB_TAG ('v', 'a', 't', 'u'),
     HB_TAG ('c', 'j', 'c', 't'),
     HB_TAG ('i', 'n', 'i', 't'),
     HB_TAG ('p', 'r', 'e', 's'),
     HB_TAG ('a', 'b', 'v', 's'),
     HB_TAG ('b', 'l', 'w', 's'),
     HB_TAG ('p', 's', 't', 's'),
     HB_TAG ('h', 'a', 'l', 'n'),
     HB_TAG ('d', 'i', 's', 't'),
     HB_TAG ('a', 'b', 'v', 'm'),
     HB_TAG ('b', 'l', 'w', 'm'),
   };

   input->sets.layout_features->add_array (default_layout_features, ARRAY_LENGTH (default_layout_features));

   if (input->in_error ())
   {
     hb_subset_input_destroy (input);
     return nullptr;
   }
   return input;
 }

 /**
  * hb_subset_input_reference: (skip)
  * @input: a #hb_subset_input_t object.
  *
  * Increases the reference count on @input.
  *
  * Return value: @input.
  *
  * Since: 1.8.0
  **/
 hb_subset_input_t *
 hb_subset_input_reference (hb_subset_input_t *input)
 {
   return hb_object_reference (input);
 }

 /**
  * hb_subset_input_destroy:
  * @input: a #hb_subset_input_t object.
  *
  * Decreases the reference count on @input, and if it reaches zero, destroys
  * @input, freeing all memory.
  *
  * Since: 1.8.0
  **/
 void
 hb_subset_input_destroy (hb_subset_input_t *input)
 {
   if (!hb_object_destroy (input)) return;

   for (hb_set_t* set : input->sets_iter ())
     hb_set_destroy (set);

   hb_free (input);
 }

 /**
  * hb_subset_input_unicode_set:
  * @input: a #hb_subset_input_t object.
  *
  * Gets the set of Unicode code points to retain, the caller should modify the
  * set as needed.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of Unicode code
  * points.
  *
  * Since: 1.8.0
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_unicode_set (hb_subset_input_t *input)
 {
   return input->sets.unicodes;
 }

 /**
  * hb_subset_input_glyph_set:
  * @input: a #hb_subset_input_t object.
  *
  * Gets the set of glyph IDs to retain, the caller should modify the set as
  * needed.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of glyph IDs.
  *
  * Since: 1.8.0
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_glyph_set (hb_subset_input_t *input)
 {
   return input->sets.glyphs;
 }

 /**
  * hb_subset_input_nameid_set:
  * @input: a #hb_subset_input_t object.
  *
  * Gets the set of name table name IDs to retain, the caller should modify the
  * set as needed.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of name IDs.
  *
  * Since: 2.9.0
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_nameid_set (hb_subset_input_t *input)
 {
   return input->sets.name_ids;
 }

 /**
  * hb_subset_input_namelangid_set:
  * @input: a #hb_subset_input_t object.
  *
  * Gets the set of name table language IDs to retain, the caller should modify
  * the set as needed.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of language IDs.
  *
  * Since: 2.9.0
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_namelangid_set (hb_subset_input_t *input)
 {
   return input->sets.name_languages;
 }


 /**
  * hb_subset_input_layout_features_set:
  * @input: a #hb_subset_input_t object.
  *
  * Gets the set of layout feature tags to retain, the caller should modify the
  * set as needed.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of feature tags.
  *
  * Since: 2.9.0
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_layout_features_set (hb_subset_input_t *input)
 {
   return input->sets.layout_features;
 }

 /**
  * hb_subset_input_drop_tables_set:
  * @input: a #hb_subset_input_t object.
  *
  * Gets the set of table tags to drop, the caller should modify the set as
  * needed.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of table tags.
  *
  * Since: 2.9.0
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_drop_tables_set (hb_subset_input_t *input)
 {
   return input->sets.drop_tables;
 }

 /**
  * hb_subset_input_set:
  * @input: a #hb_subset_input_t object.
  * @set_type: a #hb_subset_sets_t set type.
  *
  * Gets the set of the specified type.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of the specified type.
  *
  * Since: 2.9.1
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type)
 {
   return input->sets_iter () [set_type];
 }

 /**
  * hb_subset_input_no_subset_tables_set:
  * @input: a #hb_subset_input_t object.
  *
  * Gets the set of table tags which specifies tables that should not be
  * subsetted, the caller should modify the set as needed.
  *
  * Return value: (transfer none): pointer to the #hb_set_t of table tags.
  *
  * Since: 2.9.0
  **/
 HB_EXTERN hb_set_t *
 hb_subset_input_no_subset_tables_set (hb_subset_input_t *input)
 {
   return input->sets.no_subset_tables;
 }


 /**
  * hb_subset_input_get_flags:
  * @input: a #hb_subset_input_t object.
  *
  * Gets all of the subsetting flags in the input object.
  *
  * Return value: the subsetting flags bit field.
  *
  * Since: 2.9.0
  **/
 HB_EXTERN hb_subset_flags_t
 hb_subset_input_get_flags (hb_subset_input_t *input)
 {
   return (hb_subset_flags_t) input->flags;
 }

 /**
  * hb_subset_input_set_flags:
  * @input: a #hb_subset_input_t object.
  * @value: bit field of flags
  *
  * Sets all of the flags in the input object to the values specified by the bit
  * field.
  *
  * Since: 2.9.0
  **/
 HB_EXTERN void
 hb_subset_input_set_flags (hb_subset_input_t *input,
 			   unsigned value)
 {
   input->flags = (hb_subset_flags_t) value;
 }

 /**
  * hb_subset_input_set_user_data: (skip)
  * @input: a #hb_subset_input_t object.
  * @key: The user-data key to set
  * @data: A pointer to the user data
  * @destroy: (nullable): A callback to call when @data is not needed anymore
  * @replace: Whether to replace an existing data with the same key
  *
  * Attaches a user-data key/data pair to the given subset input object.
  *
  * Return value: %true if success, %false otherwise
  *
  * Since: 2.9.0
  **/
 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)
 {
   return hb_object_set_user_data (input, key, data, destroy, replace);
 }

 /**
  * hb_subset_input_get_user_data: (skip)
  * @input: a #hb_subset_input_t object.
  * @key: The user-data key to query
  *
  * Fetches the user data associated with the specified key,
  * attached to the specified subset input object.
  *
  * Return value: (transfer none): A pointer to the user data
  *
  * Since: 2.9.0
  **/
 void *
 hb_subset_input_get_user_data (const hb_subset_input_t *input,
 			       hb_user_data_key_t     *key)
 {
   return hb_object_get_user_data (input, key);
 }


 static void set_flag_value (hb_subset_input_t *input, hb_subset_flags_t flag, hb_bool_t value)
 {
   hb_subset_input_set_flags (input,
                              value
                              ? hb_subset_input_get_flags (input) | flag
                              : hb_subset_input_get_flags (input) & ~flag);
 }

 void
 hb_subset_input_set_drop_hints (hb_subset_input_t *subset_input,
 				hb_bool_t drop_hints)
 {
   return set_flag_value (subset_input,
                          HB_SUBSET_FLAGS_NO_HINTING,
                          drop_hints);
 }

 hb_bool_t
 hb_subset_input_get_drop_hints (hb_subset_input_t *subset_input)
 {
   return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NO_HINTING);
 }

 void
 hb_subset_input_set_desubroutinize (hb_subset_input_t *subset_input,
 				    hb_bool_t desubroutinize)
 {
   return set_flag_value (subset_input,
                          HB_SUBSET_FLAGS_DESUBROUTINIZE,
                          desubroutinize);
 }

 hb_bool_t
 hb_subset_input_get_desubroutinize (hb_subset_input_t *subset_input)
 {
   return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_DESUBROUTINIZE);
 }

 void
 hb_subset_input_set_retain_gids (hb_subset_input_t *subset_input,
 				 hb_bool_t retain_gids)
 {
   return set_flag_value (subset_input,
                          HB_SUBSET_FLAGS_RETAIN_GIDS,
                          retain_gids);
 }

 hb_bool_t
 hb_subset_input_get_retain_gids (hb_subset_input_t *subset_input)
 {
   return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_RETAIN_GIDS);
 }

 void
 hb_subset_input_set_name_legacy (hb_subset_input_t *subset_input,
 				 hb_bool_t name_legacy)
 {
   return set_flag_value (subset_input,
                          HB_SUBSET_FLAGS_NAME_LEGACY,
                          name_legacy);
 }

 hb_bool_t
 hb_subset_input_get_name_legacy (hb_subset_input_t *subset_input)
 {
   return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NAME_LEGACY);
 }

 void
 hb_subset_input_set_overlaps_flag (hb_subset_input_t *subset_input,
                                    hb_bool_t overlaps_flag)
 {
   return set_flag_value (subset_input,
                          HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG,
                          overlaps_flag);
 }

 hb_bool_t
 hb_subset_input_get_overlaps_flag (hb_subset_input_t *subset_input)
 {
   return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG);
 }

 void
 hb_subset_input_set_notdef_outline (hb_subset_input_t *subset_input,
                                     hb_bool_t notdef_outline)
 {
   return set_flag_value (subset_input,
                          HB_SUBSET_FLAGS_NOTDEF_OUTLINE,
                          notdef_outline);
 }

 hb_bool_t
 hb_subset_input_get_notdef_outline (hb_subset_input_t *subset_input)
 {
   return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NOTDEF_OUTLINE);
 }

 void
 hb_subset_input_set_no_prune_unicode_ranges (hb_subset_input_t *subset_input,
                                              hb_bool_t no_prune_unicode_ranges)
 {
   return set_flag_value (subset_input,
                          HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES,
                          no_prune_unicode_ranges);
 }


 hb_bool_t
 hb_subset_input_get_no_prune_unicode_ranges (hb_subset_input_t *subset_input)
 {
   return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES);
 }
	/*
	* 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): Garret Rieger, Rod Sheeter, Behdad Esfahbod
	*/

	#include "hb-subset.hh"
	#include "hb-set.hh"

	/**
	* hb_subset_input_create_or_fail:
	*
	* Creates a new subset input object.
	*
	* Return value: (transfer full): New subset input, or %NULL if failed. Destroy
	* with hb_subset_input_destroy().
	*
	* Since: 1.8.0
	**/
	hb_subset_input_t *
	hb_subset_input_create_or_fail (void)
	{
	hb_subset_input_t *input = hb_object_create<hb_subset_input_t>();

	if (unlikely (!input))
	return nullptr;

	for (auto& set : input->sets_iter ())
	set = hb_set_create ();

	if (input->in_error ())
	{
	hb_subset_input_destroy (input);
	return nullptr;
	}

	input->flags = HB_SUBSET_FLAGS_DEFAULT;

	hb_set_add_range (input->sets.name_ids, 0, 6);
	hb_set_add (input->sets.name_languages, 0x0409);

	hb_tag_t default_drop_tables[] = {
	// Layout disabled by default
	HB_TAG ('m', 'o', 'r', 'x'),
	HB_TAG ('m', 'o', 'r', 't'),
	HB_TAG ('k', 'e', 'r', 'x'),
	HB_TAG ('k', 'e', 'r', 'n'),

	// Copied from fontTools:
	HB_TAG ('B', 'A', 'S', 'E'),
	HB_TAG ('J', 'S', 'T', 'F'),
	HB_TAG ('D', 'S', 'I', 'G'),
	HB_TAG ('E', 'B', 'D', 'T'),
	HB_TAG ('E', 'B', 'L', 'C'),
	HB_TAG ('E', 'B', 'S', 'C'),
	HB_TAG ('S', 'V', 'G', ' '),
	HB_TAG ('P', 'C', 'L', 'T'),
	HB_TAG ('L', 'T', 'S', 'H'),
	// Graphite tables
	HB_TAG ('F', 'e', 'a', 't'),
	HB_TAG ('G', 'l', 'a', 't'),
	HB_TAG ('G', 'l', 'o', 'c'),
	HB_TAG ('S', 'i', 'l', 'f'),
	HB_TAG ('S', 'i', 'l', 'l'),
	};
	input->sets.drop_tables->add_array (default_drop_tables, ARRAY_LENGTH (default_drop_tables));

	hb_tag_t default_no_subset_tables[] = {
	HB_TAG ('a', 'v', 'a', 'r'),
	HB_TAG ('f', 'v', 'a', 'r'),
	HB_TAG ('g', 'a', 's', 'p'),
	HB_TAG ('c', 'v', 't', ' '),
	HB_TAG ('f', 'p', 'g', 'm'),
	HB_TAG ('p', 'r', 'e', 'p'),
	HB_TAG ('V', 'D', 'M', 'X'),
	HB_TAG ('D', 'S', 'I', 'G'),
	HB_TAG ('M', 'V', 'A', 'R'),
	HB_TAG ('c', 'v', 'a', 'r'),
	HB_TAG ('S', 'T', 'A', 'T'),
	};
	input->sets.no_subset_tables->add_array (default_no_subset_tables,
	ARRAY_LENGTH (default_no_subset_tables));

	//copied from _layout_features_groups in fonttools
	hb_tag_t default_layout_features[] = {
	// default shaper
	// common
	HB_TAG ('r', 'v', 'r', 'n'),
	HB_TAG ('c', 'c', 'm', 'p'),
	HB_TAG ('l', 'i', 'g', 'a'),
	HB_TAG ('l', 'o', 'c', 'l'),
	HB_TAG ('m', 'a', 'r', 'k'),
	HB_TAG ('m', 'k', 'm', 'k'),
	HB_TAG ('r', 'l', 'i', 'g'),

	//fractions
	HB_TAG ('f', 'r', 'a', 'c'),
	HB_TAG ('n', 'u', 'm', 'r'),
	HB_TAG ('d', 'n', 'o', 'm'),

	//horizontal
	HB_TAG ('c', 'a', 'l', 't'),
	HB_TAG ('c', 'l', 'i', 'g'),
	HB_TAG ('c', 'u', 'r', 's'),
	HB_TAG ('k', 'e', 'r', 'n'),
	HB_TAG ('r', 'c', 'l', 't'),

	//vertical
	HB_TAG ('v', 'a', 'l', 't'),
	HB_TAG ('v', 'e', 'r', 't'),
	HB_TAG ('v', 'k', 'r', 'n'),
	HB_TAG ('v', 'p', 'a', 'l'),
	HB_TAG ('v', 'r', 't', '2'),

	//ltr
	HB_TAG ('l', 't', 'r', 'a'),
	HB_TAG ('l', 't', 'r', 'm'),

	//rtl
	HB_TAG ('r', 't', 'l', 'a'),
	HB_TAG ('r', 't', 'l', 'm'),

	//Complex shapers
	//arabic
	HB_TAG ('i', 'n', 'i', 't'),
	HB_TAG ('m', 'e', 'd', 'i'),
	HB_TAG ('f', 'i', 'n', 'a'),
	HB_TAG ('i', 's', 'o', 'l'),
	HB_TAG ('m', 'e', 'd', '2'),
	HB_TAG ('f', 'i', 'n', '2'),
	HB_TAG ('f', 'i', 'n', '3'),
	HB_TAG ('c', 's', 'w', 'h'),
	HB_TAG ('m', 's', 'e', 't'),
	HB_TAG ('s', 't', 'c', 'h'),

	//hangul
	HB_TAG ('l', 'j', 'm', 'o'),
	HB_TAG ('v', 'j', 'm', 'o'),
	HB_TAG ('t', 'j', 'm', 'o'),

	//tibetan
	HB_TAG ('a', 'b', 'v', 's'),
	HB_TAG ('b', 'l', 'w', 's'),
	HB_TAG ('a', 'b', 'v', 'm'),
	HB_TAG ('b', 'l', 'w', 'm'),

	//indic
	HB_TAG ('n', 'u', 'k', 't'),
	HB_TAG ('a', 'k', 'h', 'n'),
	HB_TAG ('r', 'p', 'h', 'f'),
	HB_TAG ('r', 'k', 'r', 'f'),
	HB_TAG ('p', 'r', 'e', 'f'),
	HB_TAG ('b', 'l', 'w', 'f'),
	HB_TAG ('h', 'a', 'l', 'f'),
	HB_TAG ('a', 'b', 'v', 'f'),
	HB_TAG ('p', 's', 't', 'f'),
	HB_TAG ('c', 'f', 'a', 'r'),
	HB_TAG ('v', 'a', 't', 'u'),
	HB_TAG ('c', 'j', 'c', 't'),
	HB_TAG ('i', 'n', 'i', 't'),
	HB_TAG ('p', 'r', 'e', 's'),
	HB_TAG ('a', 'b', 'v', 's'),
	HB_TAG ('b', 'l', 'w', 's'),
	HB_TAG ('p', 's', 't', 's'),
	HB_TAG ('h', 'a', 'l', 'n'),
	HB_TAG ('d', 'i', 's', 't'),
	HB_TAG ('a', 'b', 'v', 'm'),
	HB_TAG ('b', 'l', 'w', 'm'),
	};

	input->sets.layout_features->add_array (default_layout_features, ARRAY_LENGTH (default_layout_features));

	if (input->in_error ())
	{
	hb_subset_input_destroy (input);
	return nullptr;
	}
	return input;
	}

	/**
	* hb_subset_input_reference: (skip)
	* @input: a #hb_subset_input_t object.
	*
	* Increases the reference count on @input.
	*
	* Return value: @input.
	*
	* Since: 1.8.0
	**/
	hb_subset_input_t *
	hb_subset_input_reference (hb_subset_input_t *input)
	{
	return hb_object_reference (input);
	}

	/**
	* hb_subset_input_destroy:
	* @input: a #hb_subset_input_t object.
	*
	* Decreases the reference count on @input, and if it reaches zero, destroys
	* @input, freeing all memory.
	*
	* Since: 1.8.0
	**/
	void
	hb_subset_input_destroy (hb_subset_input_t *input)
	{
	if (!hb_object_destroy (input)) return;

	for (hb_set_t* set : input->sets_iter ())
	hb_set_destroy (set);

	hb_free (input);
	}

	/**
	* hb_subset_input_unicode_set:
	* @input: a #hb_subset_input_t object.
	*
	* Gets the set of Unicode code points to retain, the caller should modify the
	* set as needed.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of Unicode code
	* points.
	*
	* Since: 1.8.0
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_unicode_set (hb_subset_input_t *input)
	{
	return input->sets.unicodes;
	}

	/**
	* hb_subset_input_glyph_set:
	* @input: a #hb_subset_input_t object.
	*
	* Gets the set of glyph IDs to retain, the caller should modify the set as
	* needed.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of glyph IDs.
	*
	* Since: 1.8.0
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_glyph_set (hb_subset_input_t *input)
	{
	return input->sets.glyphs;
	}

	/**
	* hb_subset_input_nameid_set:
	* @input: a #hb_subset_input_t object.
	*
	* Gets the set of name table name IDs to retain, the caller should modify the
	* set as needed.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of name IDs.
	*
	* Since: 2.9.0
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_nameid_set (hb_subset_input_t *input)
	{
	return input->sets.name_ids;
	}

	/**
	* hb_subset_input_namelangid_set:
	* @input: a #hb_subset_input_t object.
	*
	* Gets the set of name table language IDs to retain, the caller should modify
	* the set as needed.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of language IDs.
	*
	* Since: 2.9.0
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_namelangid_set (hb_subset_input_t *input)
	{
	return input->sets.name_languages;
	}


	/**
	* hb_subset_input_layout_features_set:
	* @input: a #hb_subset_input_t object.
	*
	* Gets the set of layout feature tags to retain, the caller should modify the
	* set as needed.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of feature tags.
	*
	* Since: 2.9.0
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_layout_features_set (hb_subset_input_t *input)
	{
	return input->sets.layout_features;
	}

	/**
	* hb_subset_input_drop_tables_set:
	* @input: a #hb_subset_input_t object.
	*
	* Gets the set of table tags to drop, the caller should modify the set as
	* needed.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of table tags.
	*
	* Since: 2.9.0
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_drop_tables_set (hb_subset_input_t *input)
	{
	return input->sets.drop_tables;
	}

	/**
	* hb_subset_input_set:
	* @input: a #hb_subset_input_t object.
	* @set_type: a #hb_subset_sets_t set type.
	*
	* Gets the set of the specified type.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of the specified type.
	*
	* Since: 2.9.1
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type)
	{
	return input->sets_iter () [set_type];
	}

	/**
	* hb_subset_input_no_subset_tables_set:
	* @input: a #hb_subset_input_t object.
	*
	* Gets the set of table tags which specifies tables that should not be
	* subsetted, the caller should modify the set as needed.
	*
	* Return value: (transfer none): pointer to the #hb_set_t of table tags.
	*
	* Since: 2.9.0
	**/
	HB_EXTERN hb_set_t *
	hb_subset_input_no_subset_tables_set (hb_subset_input_t *input)
	{
	return input->sets.no_subset_tables;
	}


	/**
	* hb_subset_input_get_flags:
	* @input: a #hb_subset_input_t object.
	*
	* Gets all of the subsetting flags in the input object.
	*
	* Return value: the subsetting flags bit field.
	*
	* Since: 2.9.0
	**/
	HB_EXTERN hb_subset_flags_t
	hb_subset_input_get_flags (hb_subset_input_t *input)
	{
	return (hb_subset_flags_t) input->flags;
	}

	/**
	* hb_subset_input_set_flags:
	* @input: a #hb_subset_input_t object.
	* @value: bit field of flags
	*
	* Sets all of the flags in the input object to the values specified by the bit
	* field.
	*
	* Since: 2.9.0
	**/
	HB_EXTERN void
	hb_subset_input_set_flags (hb_subset_input_t *input,
	unsigned value)
	{
	input->flags = (hb_subset_flags_t) value;
	}

	/**
	* hb_subset_input_set_user_data: (skip)
	* @input: a #hb_subset_input_t object.
	* @key: The user-data key to set
	* @data: A pointer to the user data
	* @destroy: (nullable): A callback to call when @data is not needed anymore
	* @replace: Whether to replace an existing data with the same key
	*
	* Attaches a user-data key/data pair to the given subset input object.
	*
	* Return value: %true if success, %false otherwise
	*
	* Since: 2.9.0
	**/
	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)
	{
	return hb_object_set_user_data (input, key, data, destroy, replace);
	}

	/**
	* hb_subset_input_get_user_data: (skip)
	* @input: a #hb_subset_input_t object.
	* @key: The user-data key to query
	*
	* Fetches the user data associated with the specified key,
	* attached to the specified subset input object.
	*
	* Return value: (transfer none): A pointer to the user data
	*
	* Since: 2.9.0
	**/
	void *
	hb_subset_input_get_user_data (const hb_subset_input_t *input,
	hb_user_data_key_t *key)
	{
	return hb_object_get_user_data (input, key);
	}


	static void set_flag_value (hb_subset_input_t *input, hb_subset_flags_t flag, hb_bool_t value)
	{
	hb_subset_input_set_flags (input,
	value
	? hb_subset_input_get_flags (input) \| flag
	: hb_subset_input_get_flags (input) & ~flag);
	}

	void
	hb_subset_input_set_drop_hints (hb_subset_input_t *subset_input,
	hb_bool_t drop_hints)
	{
	return set_flag_value (subset_input,
	HB_SUBSET_FLAGS_NO_HINTING,
	drop_hints);
	}

	hb_bool_t
	hb_subset_input_get_drop_hints (hb_subset_input_t *subset_input)
	{
	return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NO_HINTING);
	}

	void
	hb_subset_input_set_desubroutinize (hb_subset_input_t *subset_input,
	hb_bool_t desubroutinize)
	{
	return set_flag_value (subset_input,
	HB_SUBSET_FLAGS_DESUBROUTINIZE,
	desubroutinize);
	}

	hb_bool_t
	hb_subset_input_get_desubroutinize (hb_subset_input_t *subset_input)
	{
	return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_DESUBROUTINIZE);
	}

	void
	hb_subset_input_set_retain_gids (hb_subset_input_t *subset_input,
	hb_bool_t retain_gids)
	{
	return set_flag_value (subset_input,
	HB_SUBSET_FLAGS_RETAIN_GIDS,
	retain_gids);
	}

	hb_bool_t
	hb_subset_input_get_retain_gids (hb_subset_input_t *subset_input)
	{
	return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_RETAIN_GIDS);
	}

	void
	hb_subset_input_set_name_legacy (hb_subset_input_t *subset_input,
	hb_bool_t name_legacy)
	{
	return set_flag_value (subset_input,
	HB_SUBSET_FLAGS_NAME_LEGACY,
	name_legacy);
	}

	hb_bool_t
	hb_subset_input_get_name_legacy (hb_subset_input_t *subset_input)
	{
	return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NAME_LEGACY);
	}

	void
	hb_subset_input_set_overlaps_flag (hb_subset_input_t *subset_input,
	hb_bool_t overlaps_flag)
	{
	return set_flag_value (subset_input,
	HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG,
	overlaps_flag);
	}

	hb_bool_t
	hb_subset_input_get_overlaps_flag (hb_subset_input_t *subset_input)
	{
	return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG);
	}

	void
	hb_subset_input_set_notdef_outline (hb_subset_input_t *subset_input,
	hb_bool_t notdef_outline)
	{
	return set_flag_value (subset_input,
	HB_SUBSET_FLAGS_NOTDEF_OUTLINE,
	notdef_outline);
	}

	hb_bool_t
	hb_subset_input_get_notdef_outline (hb_subset_input_t *subset_input)
	{
	return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NOTDEF_OUTLINE);
	}

	void
	hb_subset_input_set_no_prune_unicode_ranges (hb_subset_input_t *subset_input,
	hb_bool_t no_prune_unicode_ranges)
	{
	return set_flag_value (subset_input,
	HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES,
	no_prune_unicode_ranges);
	}


	hb_bool_t
	hb_subset_input_get_no_prune_unicode_ranges (hb_subset_input_t *subset_input)
	{
	return (bool) (hb_subset_input_get_flags (subset_input) & HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES);
	}