--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/src/hb-ot-map.cc	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,384 @@
+/*
+ * 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_)
+{
+  hb_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];
+}
+
+bool hb_ot_map_builder_t::has_feature (hb_tag_t tag)
+{
+  for (unsigned int table_index = 0; table_index < 2; table_index++)
+  {
+    if (hb_ot_layout_language_find_feature (face,
+					    table_tags[table_index],
+					    script_index[table_index],
+					    language_index[table_index],
+					    tag,
+					    nullptr))
+      return true;
+  }
+  return false;
+}
+
+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,
+				  bool          per_syllable,
+				  hb_tag_t      feature_tag)
+{
+  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;
+      lookup->per_syllable = per_syllable;
+      lookup->feature_tag = feature_tag;
+    }
+
+    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 ();
+    auto *f = feature_infos.arrayZ;
+    unsigned int j = 0;
+    unsigned count = feature_infos.length;
+    for (unsigned int i = 1; i < count; i++)
+      if (f[i].tag != f[j].tag)
+	f[++j] = f[i];
+      else {
+	if (f[i].flags & F_GLOBAL) {
+	  f[j].flags |= F_GLOBAL;
+	  f[j].max_value = f[i].max_value;
+	  f[j].default_value = f[i].default_value;
+	} else {
+	  if (f[j].flags & F_GLOBAL)
+	    f[j].flags ^= F_GLOBAL;
+	  f[j].max_value = hb_max (f[j].max_value, f[i].max_value);
+	  /* Inherit default_value from j */
+	}
+	f[j].flags |= (f[i].flags & F_HAS_FALLBACK);
+	f[j].stage[0] = hb_min (f[j].stage[0], f[i].stage[0]);
+	f[j].stage[1] = hb_min (f[j].stage[1], f[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;
+
+  unsigned count = feature_infos.length;
+  for (unsigned int i = 0; i < count; 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);
+    map->per_syllable = !!(info->flags & F_PER_SYLLABLE);
+    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 */
+    auto &lookups = m.lookups[table_index];
+
+    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 (auto &feature : m.features)
+      {
+	if (feature.stage[table_index] == stage)
+	  add_lookups (m, table_index,
+		       feature.index[table_index],
+		       key.variations_index[table_index],
+		       feature.mask,
+		       feature.auto_zwnj,
+		       feature.auto_zwj,
+		       feature.random,
+		       feature.per_syllable,
+		       feature.tag);
+      }
+
+      /* Sort lookups and merge duplicates */
+      if (last_num_lookups < lookups.length)
+      {
+	lookups.as_array ().sub_array (last_num_lookups, lookups.length - last_num_lookups).qsort ();
+
+	unsigned int j = last_num_lookups;
+	for (unsigned int i = j + 1; i < lookups.length; i++)
+	  if (lookups.arrayZ[i].index != lookups.arrayZ[j].index)
+	    lookups.arrayZ[++j] = lookups.arrayZ[i];
+	  else
+	  {
+	    lookups.arrayZ[j].mask |= lookups.arrayZ[i].mask;
+	    lookups.arrayZ[j].auto_zwnj &= lookups.arrayZ[i].auto_zwnj;
+	    lookups.arrayZ[j].auto_zwj &= lookups.arrayZ[i].auto_zwj;
+	  }
+	lookups.shrink (j + 1);
+      }
+
+      last_num_lookups = lookups.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