src/hb-ot-map.cc - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2009,2010  Red Hat, Inc.
  * Copyright © 2010,2011,2013  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.
  *
  * Red Hat Author(s): Behdad Esfahbod
  * Google Author(s): Behdad Esfahbod
  */

 #include "hb.hh"

 #ifndef HB_NO_OT_SHAPE

 #include "hb-ot-map.hh"
 #include "hb-ot-shape.hh"
 #include "hb-ot-layout.hh"


 void hb_ot_map_t::collect_lookups (unsigned int table_index, hb_set_t *lookups_out) const
 {
   for (unsigned int i = 0; i < lookups[table_index].length; i++)
     lookups_out->add (lookups[table_index][i].index);
 }


 hb_ot_map_builder_t::hb_ot_map_builder_t (hb_face_t *face_,
 					  const hb_segment_properties_t *props_)
 {
   memset (this, 0, sizeof (*this));

   feature_infos.init ();
   for (unsigned int table_index = 0; table_index < 2; table_index++)
     stages[table_index].init ();

   face = face_;
   props = *props_;

   /* Fetch script/language indices for GSUB/GPOS.  We need these later to skip
    * features not available in either table and not waste precious bits for them. */

   unsigned int script_count = HB_OT_MAX_TAGS_PER_SCRIPT;
   unsigned int language_count = HB_OT_MAX_TAGS_PER_LANGUAGE;
   hb_tag_t script_tags[HB_OT_MAX_TAGS_PER_SCRIPT];
   hb_tag_t language_tags[HB_OT_MAX_TAGS_PER_LANGUAGE];

   hb_ot_tags_from_script_and_language (props.script,
 				       props.language,
 				       &script_count,
 				       script_tags,
 				       &language_count,
 				       language_tags);

   for (unsigned int table_index = 0; table_index < 2; table_index++)
   {
     hb_tag_t table_tag = table_tags[table_index];
     found_script[table_index] = (bool) hb_ot_layout_table_select_script (face,
 									 table_tag,
 									 script_count,
 									 script_tags,
 									 &script_index[table_index],
 									 &chosen_script[table_index]);
     hb_ot_layout_script_select_language (face,
 					 table_tag,
 					 script_index[table_index],
 					 language_count,
 					 language_tags,
 					 &language_index[table_index]);
   }
 }

 hb_ot_map_builder_t::~hb_ot_map_builder_t ()
 {
   feature_infos.fini ();
   for (unsigned int table_index = 0; table_index < 2; table_index++)
     stages[table_index].fini ();
 }

 void hb_ot_map_builder_t::add_feature (hb_tag_t tag,
 				       hb_ot_map_feature_flags_t flags,
 				       unsigned int value)
 {
   if (unlikely (!tag)) return;
   feature_info_t *info = feature_infos.push();
   info->tag = tag;
   info->seq = feature_infos.length;
   info->max_value = value;
   info->flags = flags;
   info->default_value = (flags & F_GLOBAL) ? value : 0;
   info->stage[0] = current_stage[0];
   info->stage[1] = current_stage[1];
 }

 void
 hb_ot_map_builder_t::add_lookups (hb_ot_map_t  &m,
 				  unsigned int  table_index,
 				  unsigned int  feature_index,
 				  unsigned int  variations_index,
 				  hb_mask_t     mask,
 				  bool          auto_zwnj,
 				  bool          auto_zwj,
 				  bool          random)
 {
   unsigned int lookup_indices[32];
   unsigned int offset, len;
   unsigned int table_lookup_count;

   table_lookup_count = hb_ot_layout_table_get_lookup_count (face, table_tags[table_index]);

   offset = 0;
   do {
     len = ARRAY_LENGTH (lookup_indices);
     hb_ot_layout_feature_with_variations_get_lookups (face,
 						      table_tags[table_index],
 						      feature_index,
 						      variations_index,
 						      offset, &len,
 						      lookup_indices);

     for (unsigned int i = 0; i < len; i++)
     {
       if (lookup_indices[i] >= table_lookup_count)
 	continue;
       hb_ot_map_t::lookup_map_t *lookup = m.lookups[table_index].push ();
       lookup->mask = mask;
       lookup->index = lookup_indices[i];
       lookup->auto_zwnj = auto_zwnj;
       lookup->auto_zwj = auto_zwj;
       lookup->random = random;
     }

     offset += len;
   } while (len == ARRAY_LENGTH (lookup_indices));
 }


 void hb_ot_map_builder_t::add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func)
 {
   stage_info_t *s = stages[table_index].push ();
   s->index = current_stage[table_index];
   s->pause_func = pause_func;

   current_stage[table_index]++;
 }

 void
 hb_ot_map_builder_t::compile (hb_ot_map_t                  &m,
 			      const hb_ot_shape_plan_key_t &key)
 {
   unsigned int global_bit_shift = 8 * sizeof (hb_mask_t) - 1;
   unsigned int global_bit_mask = 1u << global_bit_shift;

   m.global_mask = global_bit_mask;

   unsigned int required_feature_index[2];
   hb_tag_t required_feature_tag[2];
   /* We default to applying required feature in stage 0.  If the required
    * feature has a tag that is known to the shaper, we apply required feature
    * in the stage for that tag.
    */
   unsigned int required_feature_stage[2] = {0, 0};

   for (unsigned int table_index = 0; table_index < 2; table_index++)
   {
     m.chosen_script[table_index] = chosen_script[table_index];
     m.found_script[table_index] = found_script[table_index];

     hb_ot_layout_language_get_required_feature (face,
 						table_tags[table_index],
 						script_index[table_index],
 						language_index[table_index],
 						&required_feature_index[table_index],
 						&required_feature_tag[table_index]);
   }

   /* Sort features and merge duplicates */
   if (feature_infos.length)
   {
     feature_infos.qsort ();
     unsigned int j = 0;
     for (unsigned int i = 1; i < feature_infos.length; i++)
       if (feature_infos[i].tag != feature_infos[j].tag)
 	feature_infos[++j] = feature_infos[i];
       else {
 	if (feature_infos[i].flags & F_GLOBAL) {
 	  feature_infos[j].flags |= F_GLOBAL;
 	  feature_infos[j].max_value = feature_infos[i].max_value;
 	  feature_infos[j].default_value = feature_infos[i].default_value;
 	} else {
 	  if (feature_infos[j].flags & F_GLOBAL)
 	    feature_infos[j].flags ^= F_GLOBAL;
 	  feature_infos[j].max_value = hb_max (feature_infos[j].max_value, feature_infos[i].max_value);
 	  /* Inherit default_value from j */
 	}
 	feature_infos[j].flags |= (feature_infos[i].flags & F_HAS_FALLBACK);
 	feature_infos[j].stage[0] = hb_min (feature_infos[j].stage[0], feature_infos[i].stage[0]);
 	feature_infos[j].stage[1] = hb_min (feature_infos[j].stage[1], feature_infos[i].stage[1]);
       }
     feature_infos.shrink (j + 1);
   }


   /* Allocate bits now */
   static_assert ((!(HB_GLYPH_FLAG_DEFINED & (HB_GLYPH_FLAG_DEFINED + 1))), "");
   unsigned int next_bit = hb_popcount (HB_GLYPH_FLAG_DEFINED) + 1;

   for (unsigned int i = 0; i < feature_infos.length; i++)
   {
     const feature_info_t *info = &feature_infos[i];

     unsigned int bits_needed;

     if ((info->flags & F_GLOBAL) && info->max_value == 1)
       /* Uses the global bit */
       bits_needed = 0;
     else
       /* Limit bits per feature. */
       bits_needed = hb_min (HB_OT_MAP_MAX_BITS, hb_bit_storage (info->max_value));

     if (!info->max_value || next_bit + bits_needed >= global_bit_shift)
       continue; /* Feature disabled, or not enough bits. */


     bool found = false;
     unsigned int feature_index[2];
     for (unsigned int table_index = 0; table_index < 2; table_index++)
     {
       if (required_feature_tag[table_index] == info->tag)
 	required_feature_stage[table_index] = info->stage[table_index];

       found |= (bool) hb_ot_layout_language_find_feature (face,
 							  table_tags[table_index],
 							  script_index[table_index],
 							  language_index[table_index],
 							  info->tag,
 							  &feature_index[table_index]);
     }
     if (!found && (info->flags & F_GLOBAL_SEARCH))
     {
       for (unsigned int table_index = 0; table_index < 2; table_index++)
       {
 	found |= (bool) hb_ot_layout_table_find_feature (face,
 							 table_tags[table_index],
 							 info->tag,
 							 &feature_index[table_index]);
       }
     }
     if (!found && !(info->flags & F_HAS_FALLBACK))
       continue;


     hb_ot_map_t::feature_map_t *map = m.features.push ();

     map->tag = info->tag;
     map->index[0] = feature_index[0];
     map->index[1] = feature_index[1];
     map->stage[0] = info->stage[0];
     map->stage[1] = info->stage[1];
     map->auto_zwnj = !(info->flags & F_MANUAL_ZWNJ);
     map->auto_zwj = !(info->flags & F_MANUAL_ZWJ);
     map->random = !!(info->flags & F_RANDOM);
     if ((info->flags & F_GLOBAL) && info->max_value == 1) {
       /* Uses the global bit */
       map->shift = global_bit_shift;
       map->mask = global_bit_mask;
     } else {
       map->shift = next_bit;
       map->mask = (1u << (next_bit + bits_needed)) - (1u << next_bit);
       next_bit += bits_needed;
       m.global_mask |= (info->default_value << map->shift) & map->mask;
     }
     map->_1_mask = (1u << map->shift) & map->mask;
     map->needs_fallback = !found;
   }
   feature_infos.shrink (0); /* Done with these */


   add_gsub_pause (nullptr);
   add_gpos_pause (nullptr);

   for (unsigned int table_index = 0; table_index < 2; table_index++)
   {
     /* Collect lookup indices for features */

     unsigned int stage_index = 0;
     unsigned int last_num_lookups = 0;
     for (unsigned stage = 0; stage < current_stage[table_index]; stage++)
     {
       if (required_feature_index[table_index] != HB_OT_LAYOUT_NO_FEATURE_INDEX &&
 	  required_feature_stage[table_index] == stage)
 	add_lookups (m, table_index,
 		     required_feature_index[table_index],
 		     key.variations_index[table_index],
 		     global_bit_mask);

       for (unsigned i = 0; i < m.features.length; i++)
 	if (m.features[i].stage[table_index] == stage)
 	  add_lookups (m, table_index,
 		       m.features[i].index[table_index],
 		       key.variations_index[table_index],
 		       m.features[i].mask,
 		       m.features[i].auto_zwnj,
 		       m.features[i].auto_zwj,
 		       m.features[i].random);

       /* Sort lookups and merge duplicates */
       if (last_num_lookups < m.lookups[table_index].length)
       {
 	m.lookups[table_index].qsort (last_num_lookups, m.lookups[table_index].length);

 	unsigned int j = last_num_lookups;
 	for (unsigned int i = j + 1; i < m.lookups[table_index].length; i++)
 	  if (m.lookups[table_index][i].index != m.lookups[table_index][j].index)
 	    m.lookups[table_index][++j] = m.lookups[table_index][i];
 	  else
 	  {
 	    m.lookups[table_index][j].mask |= m.lookups[table_index][i].mask;
 	    m.lookups[table_index][j].auto_zwnj &= m.lookups[table_index][i].auto_zwnj;
 	    m.lookups[table_index][j].auto_zwj &= m.lookups[table_index][i].auto_zwj;
 	  }
 	m.lookups[table_index].shrink (j + 1);
       }

       last_num_lookups = m.lookups[table_index].length;

       if (stage_index < stages[table_index].length && stages[table_index][stage_index].index == stage) {
 	hb_ot_map_t::stage_map_t *stage_map = m.stages[table_index].push ();
 	stage_map->last_lookup = last_num_lookups;
 	stage_map->pause_func = stages[table_index][stage_index].pause_func;

 	stage_index++;
       }
     }
   }
 }


 #endif
	/*
	* Copyright © 2009,2010 Red Hat, Inc.
	* Copyright © 2010,2011,2013 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.
	*
	* Red Hat Author(s): Behdad Esfahbod
	* Google Author(s): Behdad Esfahbod
	*/

	#include "hb.hh"

	#ifndef HB_NO_OT_SHAPE

	#include "hb-ot-map.hh"
	#include "hb-ot-shape.hh"
	#include "hb-ot-layout.hh"


	void hb_ot_map_t::collect_lookups (unsigned int table_index, hb_set_t *lookups_out) const
	{
	for (unsigned int i = 0; i < lookups[table_index].length; i++)
	lookups_out->add (lookups[table_index][i].index);
	}


	hb_ot_map_builder_t::hb_ot_map_builder_t (hb_face_t *face_,
	const hb_segment_properties_t *props_)
	{
	memset (this, 0, sizeof (*this));

	feature_infos.init ();
	for (unsigned int table_index = 0; table_index < 2; table_index++)
	stages[table_index].init ();

	face = face_;
	props = *props_;

	/* Fetch script/language indices for GSUB/GPOS. We need these later to skip
	* features not available in either table and not waste precious bits for them. */

	unsigned int script_count = HB_OT_MAX_TAGS_PER_SCRIPT;
	unsigned int language_count = HB_OT_MAX_TAGS_PER_LANGUAGE;
	hb_tag_t script_tags[HB_OT_MAX_TAGS_PER_SCRIPT];
	hb_tag_t language_tags[HB_OT_MAX_TAGS_PER_LANGUAGE];

	hb_ot_tags_from_script_and_language (props.script,
	props.language,
	&script_count,
	script_tags,
	&language_count,
	language_tags);

	for (unsigned int table_index = 0; table_index < 2; table_index++)
	{
	hb_tag_t table_tag = table_tags[table_index];
	found_script[table_index] = (bool) hb_ot_layout_table_select_script (face,
	table_tag,
	script_count,
	script_tags,
	&script_index[table_index],
	&chosen_script[table_index]);
	hb_ot_layout_script_select_language (face,
	table_tag,
	script_index[table_index],
	language_count,
	language_tags,
	&language_index[table_index]);
	}
	}

	hb_ot_map_builder_t::~hb_ot_map_builder_t ()
	{
	feature_infos.fini ();
	for (unsigned int table_index = 0; table_index < 2; table_index++)
	stages[table_index].fini ();
	}

	void hb_ot_map_builder_t::add_feature (hb_tag_t tag,
	hb_ot_map_feature_flags_t flags,
	unsigned int value)
	{
	if (unlikely (!tag)) return;
	feature_info_t *info = feature_infos.push();
	info->tag = tag;
	info->seq = feature_infos.length;
	info->max_value = value;
	info->flags = flags;
	info->default_value = (flags & F_GLOBAL) ? value : 0;
	info->stage[0] = current_stage[0];
	info->stage[1] = current_stage[1];
	}

	void
	hb_ot_map_builder_t::add_lookups (hb_ot_map_t &m,
	unsigned int table_index,
	unsigned int feature_index,
	unsigned int variations_index,
	hb_mask_t mask,
	bool auto_zwnj,
	bool auto_zwj,
	bool random)
	{
	unsigned int lookup_indices[32];
	unsigned int offset, len;
	unsigned int table_lookup_count;

	table_lookup_count = hb_ot_layout_table_get_lookup_count (face, table_tags[table_index]);

	offset = 0;
	do {
	len = ARRAY_LENGTH (lookup_indices);
	hb_ot_layout_feature_with_variations_get_lookups (face,
	table_tags[table_index],
	feature_index,
	variations_index,
	offset, &len,
	lookup_indices);

	for (unsigned int i = 0; i < len; i++)
	{
	if (lookup_indices[i] >= table_lookup_count)
	continue;
	hb_ot_map_t::lookup_map_t *lookup = m.lookups[table_index].push ();
	lookup->mask = mask;
	lookup->index = lookup_indices[i];
	lookup->auto_zwnj = auto_zwnj;
	lookup->auto_zwj = auto_zwj;
	lookup->random = random;
	}

	offset += len;
	} while (len == ARRAY_LENGTH (lookup_indices));
	}


	void hb_ot_map_builder_t::add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func)
	{
	stage_info_t *s = stages[table_index].push ();
	s->index = current_stage[table_index];
	s->pause_func = pause_func;

	current_stage[table_index]++;
	}

	void
	hb_ot_map_builder_t::compile (hb_ot_map_t &m,
	const hb_ot_shape_plan_key_t &key)
	{
	unsigned int global_bit_shift = 8 * sizeof (hb_mask_t) - 1;
	unsigned int global_bit_mask = 1u << global_bit_shift;

	m.global_mask = global_bit_mask;

	unsigned int required_feature_index[2];
	hb_tag_t required_feature_tag[2];
	/* We default to applying required feature in stage 0. If the required
	* feature has a tag that is known to the shaper, we apply required feature
	* in the stage for that tag.
	*/
	unsigned int required_feature_stage[2] = {0, 0};

	for (unsigned int table_index = 0; table_index < 2; table_index++)
	{
	m.chosen_script[table_index] = chosen_script[table_index];
	m.found_script[table_index] = found_script[table_index];

	hb_ot_layout_language_get_required_feature (face,
	table_tags[table_index],
	script_index[table_index],
	language_index[table_index],
	&required_feature_index[table_index],
	&required_feature_tag[table_index]);
	}

	/* Sort features and merge duplicates */
	if (feature_infos.length)
	{
	feature_infos.qsort ();
	unsigned int j = 0;
	for (unsigned int i = 1; i < feature_infos.length; i++)
	if (feature_infos[i].tag != feature_infos[j].tag)
	feature_infos[++j] = feature_infos[i];
	else {
	if (feature_infos[i].flags & F_GLOBAL) {
	feature_infos[j].flags \|= F_GLOBAL;
	feature_infos[j].max_value = feature_infos[i].max_value;
	feature_infos[j].default_value = feature_infos[i].default_value;
	} else {
	if (feature_infos[j].flags & F_GLOBAL)
	feature_infos[j].flags ^= F_GLOBAL;
	feature_infos[j].max_value = hb_max (feature_infos[j].max_value, feature_infos[i].max_value);
	/* Inherit default_value from j */
	}
	feature_infos[j].flags \|= (feature_infos[i].flags & F_HAS_FALLBACK);
	feature_infos[j].stage[0] = hb_min (feature_infos[j].stage[0], feature_infos[i].stage[0]);
	feature_infos[j].stage[1] = hb_min (feature_infos[j].stage[1], feature_infos[i].stage[1]);
	}
	feature_infos.shrink (j + 1);
	}


	/* Allocate bits now */
	static_assert ((!(HB_GLYPH_FLAG_DEFINED & (HB_GLYPH_FLAG_DEFINED + 1))), "");
	unsigned int next_bit = hb_popcount (HB_GLYPH_FLAG_DEFINED) + 1;

	for (unsigned int i = 0; i < feature_infos.length; i++)
	{
	const feature_info_t *info = &feature_infos[i];

	unsigned int bits_needed;

	if ((info->flags & F_GLOBAL) && info->max_value == 1)
	/* Uses the global bit */
	bits_needed = 0;
	else
	/* Limit bits per feature. */
	bits_needed = hb_min (HB_OT_MAP_MAX_BITS, hb_bit_storage (info->max_value));

	if (!info->max_value \|\| next_bit + bits_needed >= global_bit_shift)
	continue; /* Feature disabled, or not enough bits. */


	bool found = false;
	unsigned int feature_index[2];
	for (unsigned int table_index = 0; table_index < 2; table_index++)
	{
	if (required_feature_tag[table_index] == info->tag)
	required_feature_stage[table_index] = info->stage[table_index];

	found \|= (bool) hb_ot_layout_language_find_feature (face,
	table_tags[table_index],
	script_index[table_index],
	language_index[table_index],
	info->tag,
	&feature_index[table_index]);
	}
	if (!found && (info->flags & F_GLOBAL_SEARCH))
	{
	for (unsigned int table_index = 0; table_index < 2; table_index++)
	{
	found \|= (bool) hb_ot_layout_table_find_feature (face,
	table_tags[table_index],
	info->tag,
	&feature_index[table_index]);
	}
	}
	if (!found && !(info->flags & F_HAS_FALLBACK))
	continue;


	hb_ot_map_t::feature_map_t *map = m.features.push ();

	map->tag = info->tag;
	map->index[0] = feature_index[0];
	map->index[1] = feature_index[1];
	map->stage[0] = info->stage[0];
	map->stage[1] = info->stage[1];
	map->auto_zwnj = !(info->flags & F_MANUAL_ZWNJ);
	map->auto_zwj = !(info->flags & F_MANUAL_ZWJ);
	map->random = !!(info->flags & F_RANDOM);
	if ((info->flags & F_GLOBAL) && info->max_value == 1) {
	/* Uses the global bit */
	map->shift = global_bit_shift;
	map->mask = global_bit_mask;
	} else {
	map->shift = next_bit;
	map->mask = (1u << (next_bit + bits_needed)) - (1u << next_bit);
	next_bit += bits_needed;
	m.global_mask \|= (info->default_value << map->shift) & map->mask;
	}
	map->_1_mask = (1u << map->shift) & map->mask;
	map->needs_fallback = !found;
	}
	feature_infos.shrink (0); /* Done with these */


	add_gsub_pause (nullptr);
	add_gpos_pause (nullptr);

	for (unsigned int table_index = 0; table_index < 2; table_index++)
	{
	/* Collect lookup indices for features */

	unsigned int stage_index = 0;
	unsigned int last_num_lookups = 0;
	for (unsigned stage = 0; stage < current_stage[table_index]; stage++)
	{
	if (required_feature_index[table_index] != HB_OT_LAYOUT_NO_FEATURE_INDEX &&
	required_feature_stage[table_index] == stage)
	add_lookups (m, table_index,
	required_feature_index[table_index],
	key.variations_index[table_index],
	global_bit_mask);

	for (unsigned i = 0; i < m.features.length; i++)
	if (m.features[i].stage[table_index] == stage)
	add_lookups (m, table_index,
	m.features[i].index[table_index],
	key.variations_index[table_index],
	m.features[i].mask,
	m.features[i].auto_zwnj,
	m.features[i].auto_zwj,
	m.features[i].random);

	/* Sort lookups and merge duplicates */
	if (last_num_lookups < m.lookups[table_index].length)
	{
	m.lookups[table_index].qsort (last_num_lookups, m.lookups[table_index].length);

	unsigned int j = last_num_lookups;
	for (unsigned int i = j + 1; i < m.lookups[table_index].length; i++)
	if (m.lookups[table_index][i].index != m.lookups[table_index][j].index)
	m.lookups[table_index][++j] = m.lookups[table_index][i];
	else
	{
	m.lookups[table_index][j].mask \|= m.lookups[table_index][i].mask;
	m.lookups[table_index][j].auto_zwnj &= m.lookups[table_index][i].auto_zwnj;
	m.lookups[table_index][j].auto_zwj &= m.lookups[table_index][i].auto_zwj;
	}
	m.lookups[table_index].shrink (j + 1);
	}

	last_num_lookups = m.lookups[table_index].length;

	if (stage_index < stages[table_index].length && stages[table_index][stage_index].index == stage) {
	hb_ot_map_t::stage_map_t *stage_map = m.stages[table_index].push ();
	stage_map->last_lookup = last_num_lookups;
	stage_map->pause_func = stages[table_index][stage_index].pause_func;

	stage_index++;
	}
	}
	}
	}


	#endif