15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/*
25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright © 2009,2010  Red Hat, Inc.
37d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) * Copyright © 2010,2011,2013  Google, Inc.
45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *
55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *  This is part of HarfBuzz, a text shaping library.
65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *
75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Permission is hereby granted, without written agreement and without
85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * license or royalty fees, to use, copy, modify, and distribute this
95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * software and its documentation for any purpose, provided that the
105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * above copyright notice and the following two paragraphs appear in
115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * all copies of this software.
125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *
135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DAMAGE.
185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *
195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *
255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Red Hat Author(s): Behdad Esfahbod
265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Google Author(s): Behdad Esfahbod
275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */
285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "hb-ot-map-private.hh"
305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
317d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "hb-ot-layout-private.hh"
327d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)
335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void
355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)hb_ot_map_t::add_lookups (hb_face_t    *face,
365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)			  unsigned int  table_index,
375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)			  unsigned int  feature_index,
38c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)			  hb_mask_t     mask,
39c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)			  bool          auto_zwj)
405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){
415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  unsigned int lookup_indices[32];
425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  unsigned int offset, len;
43f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)  unsigned int table_lookup_count;
44f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)
45f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)  table_lookup_count = hb_ot_layout_table_get_lookup_count (face, table_tags[table_index]);
465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  offset = 0;
485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  do {
495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    len = ARRAY_LENGTH (lookup_indices);
502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    hb_ot_layout_feature_get_lookups (face,
512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)				      table_tags[table_index],
522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)				      feature_index,
532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)				      offset, &len,
542a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)				      lookup_indices);
555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
56f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)    for (unsigned int i = 0; i < len; i++)
57f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)    {
58f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)      if (lookup_indices[i] >= table_lookup_count)
59f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)	continue;
605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      hb_ot_map_t::lookup_map_t *lookup = lookups[table_index].push ();
615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      if (unlikely (!lookup))
625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)        return;
635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      lookup->mask = mask;
645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      lookup->index = lookup_indices[i];
65c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)      lookup->auto_zwj = auto_zwj;
665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    }
675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    offset += len;
695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  } while (len == ARRAY_LENGTH (lookup_indices));
705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}
715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)hb_ot_map_builder_t::hb_ot_map_builder_t (hb_face_t *face_,
732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)					  const hb_segment_properties_t *props_)
742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles){
752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  memset (this, 0, sizeof (*this));
762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)
772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  face = face_;
782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  props = *props_;
792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)
802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)
812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  /* Fetch script/language indices for GSUB/GPOS.  We need these later to skip
822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)   * features not available in either table and not waste precious bits for them. */
832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)
842a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  hb_tag_t script_tags[3] = {HB_TAG_NONE, HB_TAG_NONE, HB_TAG_NONE};
852a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  hb_tag_t language_tag;
862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)
872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  hb_ot_tags_from_script (props.script, &script_tags[0], &script_tags[1]);
882a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  language_tag = hb_ot_tag_from_language (props.language);
892a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)
902a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  for (unsigned int table_index = 0; table_index < 2; table_index++) {
912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    hb_tag_t table_tag = table_tags[table_index];
922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    found_script[table_index] = hb_ot_layout_table_choose_script (face, table_tag, script_tags, &script_index[table_index], &chosen_script[table_index]);
932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    hb_ot_layout_script_find_language (face, table_tag, script_index[table_index], language_tag, &language_index[table_index]);
942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  }
952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)}
965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
97c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)void hb_ot_map_builder_t::add_feature (hb_tag_t tag, unsigned int value,
98c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)				       hb_ot_map_feature_flags_t flags)
995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){
1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  feature_info_t *info = feature_infos.push();
1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  if (unlikely (!info)) return;
1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  info->tag = tag;
1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  info->seq = feature_infos.len;
1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  info->max_value = value;
105c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)  info->flags = flags;
106c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)  info->default_value = (flags & F_GLOBAL) ? value : 0;
1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  info->stage[0] = current_stage[0];
1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  info->stage[1] = current_stage[1];
1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}
1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1117d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)
1122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void hb_ot_map_t::collect_lookups (unsigned int table_index, hb_set_t *lookups_out) const
1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){
1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  for (unsigned int i = 0; i < lookups[table_index].len; i++)
1152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    hb_set_add (lookups_out, lookups[table_index][i].index);
1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}
1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void hb_ot_map_builder_t::add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func)
1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){
1207d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)  stage_info_t *s = stages[table_index].push ();
1217d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)  if (likely (s)) {
1227d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)    s->index = current_stage[table_index];
1237d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)    s->pause_func = pause_func;
1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  }
1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  current_stage[table_index]++;
1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}
1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void
1302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)hb_ot_map_builder_t::compile (hb_ot_map_t &m)
1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){
1322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  m.global_mask = 1;
1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  for (unsigned int table_index = 0; table_index < 2; table_index++) {
1352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    m.chosen_script[table_index] = chosen_script[table_index];
1362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    m.found_script[table_index] = found_script[table_index];
1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  }
1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)  if (!feature_infos.len)
1402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)    return;
1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  /* Sort features and merge duplicates */
1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  {
1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    feature_infos.sort ();
1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    unsigned int j = 0;
1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    for (unsigned int i = 1; i < feature_infos.len; i++)
1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      if (feature_infos[i].tag != feature_infos[j].tag)
1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	feature_infos[++j] = feature_infos[i];
1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      else {
150c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	if (feature_infos[i].flags & F_GLOBAL) {
151c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	  feature_infos[j].flags |= F_GLOBAL;
1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	  feature_infos[j].max_value = feature_infos[i].max_value;
1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	  feature_infos[j].default_value = feature_infos[i].default_value;
1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	} else {
155c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	  feature_infos[j].flags &= ~F_GLOBAL;
1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	  feature_infos[j].max_value = MAX (feature_infos[j].max_value, feature_infos[i].max_value);
157c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	  /* Inherit default_value from j */
1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	}
159c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	feature_infos[j].flags |= (feature_infos[i].flags & F_HAS_FALLBACK);
1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	feature_infos[j].stage[0] = MIN (feature_infos[j].stage[0], feature_infos[i].stage[0]);
1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	feature_infos[j].stage[1] = MIN (feature_infos[j].stage[1], feature_infos[i].stage[1]);
1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      }
1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    feature_infos.shrink (j + 1);
1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  }
1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  /* Allocate bits now */
1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  unsigned int next_bit = 1;
1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  for (unsigned int i = 0; i < feature_infos.len; i++) {
1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    const feature_info_t *info = &feature_infos[i];
1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    unsigned int bits_needed;
1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
174c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)    if ((info->flags & F_GLOBAL) && info->max_value == 1)
1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      /* Uses the global bit */
1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      bits_needed = 0;
1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    else
1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      bits_needed = _hb_bit_storage (info->max_value);
1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    if (!info->max_value || next_bit + bits_needed > 8 * sizeof (hb_mask_t))
1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      continue; /* Feature disabled, or not enough bits. */
1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
184f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)    hb_bool_t found = false;
1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    unsigned int feature_index[2];
1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    for (unsigned int table_index = 0; table_index < 2; table_index++)
1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      found |= hb_ot_layout_language_find_feature (face,
1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)						   table_tags[table_index],
1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)						   script_index[table_index],
1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)						   language_index[table_index],
1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)						   info->tag,
1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)						   &feature_index[table_index]);
193c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)    if (!found && !(info->flags & F_HAS_FALLBACK))
1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      continue;
1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    hb_ot_map_t::feature_map_t *map = m.features.push ();
1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    if (unlikely (!map))
1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      break;
2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    map->tag = info->tag;
2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    map->index[0] = feature_index[0];
2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    map->index[1] = feature_index[1];
2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    map->stage[0] = info->stage[0];
2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    map->stage[1] = info->stage[1];
206c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)    map->auto_zwj = !(info->flags & F_MANUAL_ZWJ);
207c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)    if ((info->flags & F_GLOBAL) && info->max_value == 1) {
2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      /* Uses the global bit */
2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      map->shift = 0;
2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      map->mask = 1;
2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    } else {
2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      map->shift = next_bit;
2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      map->mask = (1 << (next_bit + bits_needed)) - (1 << next_bit);
2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      next_bit += bits_needed;
215c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)      m.global_mask |= (info->default_value << map->shift) & map->mask;
2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    }
2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    map->_1_mask = (1 << map->shift) & map->mask;
2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    map->needs_fallback = !found;
2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  }
2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  feature_infos.shrink (0); /* Done with these */
2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  add_gsub_pause (NULL);
2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  add_gpos_pause (NULL);
2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  for (unsigned int table_index = 0; table_index < 2; table_index++) {
2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    hb_tag_t table_tag = table_tags[table_index];
2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    /* Collect lookup indices for features */
2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    unsigned int required_feature_index;
2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    if (hb_ot_layout_language_get_required_feature_index (face,
2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)							  table_tag,
2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)							  script_index[table_index],
2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)							  language_index[table_index],
2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)							  &required_feature_index))
238c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)      m.add_lookups (face, table_index, required_feature_index, 1, true);
2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2407d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)    unsigned int stage_index = 0;
2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    unsigned int last_num_lookups = 0;
2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    for (unsigned stage = 0; stage < current_stage[table_index]; stage++)
2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    {
2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      for (unsigned i = 0; i < m.features.len; i++)
2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)        if (m.features[i].stage[table_index] == stage)
246c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	  m.add_lookups (face, table_index,
247c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)			 m.features[i].index[table_index],
248c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)			 m.features[i].mask,
249c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)			 m.features[i].auto_zwj);
2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      /* Sort lookups and merge duplicates */
2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      if (last_num_lookups < m.lookups[table_index].len)
2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      {
2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	m.lookups[table_index].sort (last_num_lookups, m.lookups[table_index].len);
2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	unsigned int j = last_num_lookups;
2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	for (unsigned int i = j + 1; i < m.lookups[table_index].len; i++)
2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	  if (m.lookups[table_index][i].index != m.lookups[table_index][j].index)
2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	    m.lookups[table_index][++j] = m.lookups[table_index][i];
2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	  else
261c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	  {
2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	    m.lookups[table_index][j].mask |= m.lookups[table_index][i].mask;
263c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	    m.lookups[table_index][j].auto_zwj &= m.lookups[table_index][i].auto_zwj;
264c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)	  }
2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	m.lookups[table_index].shrink (j + 1);
2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      }
2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      last_num_lookups = m.lookups[table_index].len;
2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2707d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)      if (stage_index < stages[table_index].len && stages[table_index][stage_index].index == stage) {
2717d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)	hb_ot_map_t::stage_map_t *stage_map = m.stages[table_index].push ();
2727d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)	if (likely (stage_map)) {
2737d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)	  stage_map->last_lookup = last_num_lookups;
2747d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)	  stage_map->pause_func = stages[table_index][stage_index].pause_func;
2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)	}
2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)
2777d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)	stage_index++;
2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)      }
2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)    }
2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)  }
2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}
282