third_party_harfbuzz/huawei_harfbuzz.patch

diff --git a/src/hb-buffer.h b/src/hb-buffer.h
index 865ccb2..88f1f4c 100644
--- a/src/hb-buffer.h
+++ b/src/hb-buffer.h
@@ -307,7 +307,8 @@ typedef enum { /*< flags >*/
   HB_BUFFER_FLAG_EOT				= 0x00000002u, /* End-of-text */
   HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES	= 0x00000004u,
   HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES	= 0x00000008u,
-  HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE	= 0x00000010u
+  HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE	= 0x00000010u,
+  HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT = 0x00000040u
 } hb_buffer_flags_t;
 
 HB_EXTERN void
diff --git a/src/hb-open-type.hh b/src/hb-open-type.hh
index 406771f..b8ac4c5 100644
--- a/src/hb-open-type.hh
+++ b/src/hb-open-type.hh
@@ -575,8 +575,13 @@ struct SortedUnsizedArrayOf : UnsizedArrayOf<Type>
   { return hb_sorted_array (this->arrayZ, len); }
   hb_sorted_array_t<const Type> as_array (unsigned int len) const
   { return hb_sorted_array (this->arrayZ, len); }
+#ifdef ENABLE_ICCARM
+  operator hb_sorted_array_t<Type> ()             { return as_array (0); }
+  operator hb_sorted_array_t<const Type> () const { return as_array (0); }
+#else
   operator hb_sorted_array_t<Type> ()             { return as_array (); }
   operator hb_sorted_array_t<const Type> () const { return as_array (); }
+#endif
 
   template <typename T>
   Type &bsearch (unsigned int len, const T &x, Type &not_found = Crap (Type))
diff --git a/src/hb-ot-layout-common.hh b/src/hb-ot-layout-common.hh
index c78f820..c9d93a7 100644
--- a/src/hb-ot-layout-common.hh
+++ b/src/hb-ot-layout-common.hh
@@ -445,6 +445,7 @@ struct RecordListOf : RecordArrayOf<Type>
   }
 };
 
+#ifndef ENABLE_ICCARM  // Adaptive compilation, only changes the order of the code, does not affect the function
 struct Feature;
 
 struct RecordListOfFeature : RecordListOf<Feature>
@@ -797,7 +798,7 @@ struct Script
 };
 
 typedef RecordListOfScript ScriptList;
-
+#endif  //  ENABLE_ICCARM
 
 /* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#size */
 struct FeatureParamsSize
@@ -1081,6 +1082,52 @@ struct FeatureParams
   DEFINE_SIZE_MIN (0);
 };
 
+#ifdef ENABLE_ICCARM  // Adaptive compilation, only changes the order of the code, does not affect the function
+struct IndexArray : Array16Of<Index>
+{
+  bool intersects (const hb_map_t *indexes) const
+  { return hb_any (*this, indexes); }
+
+  template <typename Iterator,
+	    hb_requires (hb_is_iterator (Iterator))>
+  void serialize (hb_serialize_context_t *c,
+		  hb_subset_layout_context_t *l,
+		  Iterator it)
+  {
+    if (!it) return;
+    if (unlikely (!c->extend_min ((*this)))) return;
+
+    for (const auto _ : it)
+    {
+      if (!l->visitLookupIndex()) break;
+
+      Index i;
+      i = _;
+      c->copy (i);
+      this->len++;
+    }
+  }
+
+  unsigned int get_indexes (unsigned int start_offset,
+			    unsigned int *_count /* IN/OUT */,
+			    unsigned int *_indexes /* OUT */) const
+  {
+    if (_count)
+    {
+      + this->sub_array (start_offset, _count)
+      | hb_sink (hb_array (_indexes, *_count))
+      ;
+    }
+    return this->len;
+  }
+
+  void add_indexes_to (hb_set_t* output /* OUT */) const
+  {
+    output->add_array (as_array ());
+  }
+};
+#endif // ENABLE_ICCARM
+
 struct Feature
 {
   unsigned int get_lookup_count () const
@@ -1176,6 +1223,311 @@ struct Feature
   DEFINE_SIZE_ARRAY_SIZED (4, lookupIndex);
 };
 
+#ifdef ENABLE_ICCARM // Adaptive compilation, only changes the order of the code, does not affect the function
+struct RecordListOfFeature : RecordListOf<Feature>
+{
+  bool subset (hb_subset_context_t *c,
+	       hb_subset_layout_context_t *l) const
+  {
+    TRACE_SUBSET (this);
+    auto *out = c->serializer->start_embed (*this);
+    if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
+
+    unsigned count = this->len;
+    + hb_zip (*this, hb_range (count))
+    | hb_filter (l->feature_index_map, hb_second)
+    | hb_map (hb_first)
+    | hb_apply (subset_record_array (l, out, this))
+    ;
+    return_trace (true);
+  }
+};
+
+struct LangSys
+{
+  unsigned int get_feature_count () const
+  { return featureIndex.len; }
+  hb_tag_t get_feature_index (unsigned int i) const
+  { return featureIndex[i]; }
+  unsigned int get_feature_indexes (unsigned int start_offset,
+				    unsigned int *feature_count /* IN/OUT */,
+				    unsigned int *feature_indexes /* OUT */) const
+  { return featureIndex.get_indexes (start_offset, feature_count, feature_indexes); }
+  void add_feature_indexes_to (hb_set_t *feature_indexes) const
+  { featureIndex.add_indexes_to (feature_indexes); }
+
+  bool has_required_feature () const { return reqFeatureIndex != 0xFFFFu; }
+  unsigned int get_required_feature_index () const
+  {
+    if (reqFeatureIndex == 0xFFFFu)
+      return Index::NOT_FOUND_INDEX;
+   return reqFeatureIndex;
+  }
+
+  LangSys* copy (hb_serialize_context_t *c) const
+  {
+    TRACE_SERIALIZE (this);
+    return_trace (c->embed (*this));
+  }
+
+  bool compare (const LangSys& o, const hb_map_t *feature_index_map) const
+  {
+    if (reqFeatureIndex != o.reqFeatureIndex)
+      return false;
+
+    auto iter =
+    + hb_iter (featureIndex)
+    | hb_filter (feature_index_map)
+    | hb_map (feature_index_map)
+    ;
+
+    auto o_iter =
+    + hb_iter (o.featureIndex)
+    | hb_filter (feature_index_map)
+    | hb_map (feature_index_map)
+    ;
+
+    if (iter.len () != o_iter.len ())
+      return false;
+
+    for (const auto _ : + hb_zip (iter, o_iter))
+      if (_.first != _.second) return false;
+
+    return true;
+  }
+
+  void collect_features (hb_prune_langsys_context_t *c) const
+  {
+    if (!has_required_feature () && !get_feature_count ()) return;
+    if (c->visitedLangsys (this)) return;
+    if (has_required_feature () &&
+        c->duplicate_feature_map->has (reqFeatureIndex))
+      c->new_feature_indexes->add (get_required_feature_index ());
+
+    + hb_iter (featureIndex)
+    | hb_filter (c->duplicate_feature_map)
+    | hb_sink (c->new_feature_indexes)
+    ;
+  }
+
+  bool subset (hb_subset_context_t        *c,
+	       hb_subset_layout_context_t *l,
+	       const Tag                  *tag = nullptr) const
+  {
+    TRACE_SUBSET (this);
+    auto *out = c->serializer->start_embed (*this);
+    if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
+
+    out->reqFeatureIndex = l->feature_index_map->has (reqFeatureIndex) ? l->feature_index_map->get (reqFeatureIndex) : 0xFFFFu;
+
+    if (!l->visitFeatureIndex (featureIndex.len))
+      return_trace (false);
+
+    auto it =
+    + hb_iter (featureIndex)
+    | hb_filter (l->feature_index_map)
+    | hb_map (l->feature_index_map)
+    ;
+
+    bool ret = bool (it);
+    out->featureIndex.serialize (c->serializer, l, it);
+    return_trace (ret);
+  }
+
+  bool sanitize (hb_sanitize_context_t *c,
+		 const Record_sanitize_closure_t * = nullptr) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this) && featureIndex.sanitize (c));
+  }
+
+  Offset16	lookupOrderZ;	/* = Null (reserved for an offset to a
+				 * reordering table) */
+  HBUINT16	reqFeatureIndex;/* Index of a feature required for this
+				 * language system--if no required features
+				 * = 0xFFFFu */
+  IndexArray	featureIndex;	/* Array of indices into the FeatureList */
+  public:
+  DEFINE_SIZE_ARRAY_SIZED (6, featureIndex);
+};
+DECLARE_NULL_NAMESPACE_BYTES (OT, LangSys);
+
+struct Script
+{
+  unsigned int get_lang_sys_count () const
+  { return langSys.len; }
+  const Tag& get_lang_sys_tag (unsigned int i) const
+  { return langSys.get_tag (i); }
+  unsigned int get_lang_sys_tags (unsigned int start_offset,
+				  unsigned int *lang_sys_count /* IN/OUT */,
+				  hb_tag_t     *lang_sys_tags /* OUT */) const
+  { return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
+  const LangSys& get_lang_sys (unsigned int i) const
+  {
+    if (i == Index::NOT_FOUND_INDEX) return get_default_lang_sys ();
+    return this+langSys[i].offset;
+  }
+  bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
+  { return langSys.find_index (tag, index); }
+
+  bool has_default_lang_sys () const           { return defaultLangSys != 0; }
+  const LangSys& get_default_lang_sys () const { return this+defaultLangSys; }
+
+  void prune_langsys (hb_prune_langsys_context_t *c,
+                      unsigned script_index) const
+  {
+    if (!has_default_lang_sys () && !get_lang_sys_count ()) return;
+    if (c->visitedScript (this)) return;
+
+    if (!c->script_langsys_map->has (script_index))
+    {
+      hb_set_t* empty_set = hb_set_create ();
+      if (unlikely (!c->script_langsys_map->set (script_index, empty_set)))
+      {
+	hb_set_destroy (empty_set);
+	return;
+      }
+    }
+
+    unsigned langsys_count = get_lang_sys_count ();
+    if (has_default_lang_sys ())
+    {
+      //only collect features from non-redundant langsys
+      const LangSys& d = get_default_lang_sys ();
+      d.collect_features (c);
+
+      for (auto _ : + hb_zip (langSys, hb_range (langsys_count)))
+      {
+        const LangSys& l = this+_.first.offset;
+        if (l.compare (d, c->duplicate_feature_map)) continue;
+
+        l.collect_features (c);
+        c->script_langsys_map->get (script_index)->add (_.second);
+      }
+    }
+    else
+    {
+      for (auto _ : + hb_zip (langSys, hb_range (langsys_count)))
+      {
+        const LangSys& l = this+_.first.offset;
+        l.collect_features (c);
+        c->script_langsys_map->get (script_index)->add (_.second);
+      }
+    }
+  }
+
+  bool subset (hb_subset_context_t         *c,
+	       hb_subset_layout_context_t  *l,
+	       const Tag                   *tag) const
+  {
+    TRACE_SUBSET (this);
+    if (!l->visitScript ()) return_trace (false);
+
+    auto *out = c->serializer->start_embed (*this);
+    if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
+
+    bool defaultLang = false;
+    if (has_default_lang_sys ())
+    {
+      c->serializer->push ();
+      const LangSys& ls = this+defaultLangSys;
+      bool ret = ls.subset (c, l);
+      if (!ret && tag && *tag != HB_TAG ('D', 'F', 'L', 'T'))
+      {
+	c->serializer->pop_discard ();
+	out->defaultLangSys = 0;
+      }
+      else
+      {
+	c->serializer->add_link (out->defaultLangSys, c->serializer->pop_pack ());
+	defaultLang = true;
+      }
+    }
+
+    const hb_set_t *active_langsys = l->script_langsys_map->get (l->cur_script_index);
+    if (active_langsys)
+    {
+      unsigned count = langSys.len;
+      + hb_zip (langSys, hb_range (count))
+      | hb_filter (active_langsys, hb_second)
+      | hb_map (hb_first)
+      | hb_filter ([=] (const Record<LangSys>& record) {return l->visitLangSys (); })
+      | hb_apply (subset_record_array (l, &(out->langSys), this))
+      ;
+    }
+
+    return_trace (bool (out->langSys.len) || defaultLang || l->table_tag == HB_OT_TAG_GSUB);
+  }
+
+  bool sanitize (hb_sanitize_context_t *c,
+		 const Record_sanitize_closure_t * = nullptr) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (defaultLangSys.sanitize (c, this) && langSys.sanitize (c, this));
+  }
+
+  protected:
+  Offset16To<LangSys>
+		defaultLangSys;	/* Offset to DefaultLangSys table--from
+				 * beginning of Script table--may be Null */
+  RecordArrayOf<LangSys>
+		langSys;	/* Array of LangSysRecords--listed
+				 * alphabetically by LangSysTag */
+  public:
+  DEFINE_SIZE_ARRAY_SIZED (4, langSys);
+};
+struct RecordListOfScript : RecordListOf<Script>
+{
+  bool subset (hb_subset_context_t *c,
+               hb_subset_layout_context_t *l) const
+  {
+    TRACE_SUBSET (this);
+    auto *out = c->serializer->start_embed (*this);
+    if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
+
+    unsigned count = this->len;
+    for (auto _ : + hb_zip (*this, hb_range (count)))
+    {
+      auto snap = c->serializer->snapshot ();
+      l->cur_script_index = _.second;
+      bool ret = _.first.subset (l, this);
+      if (!ret) c->serializer->revert (snap);
+      else out->len++;
+    }
+
+    return_trace (true);
+  }
+};
+
+struct RangeRecord
+{
+  int cmp (hb_codepoint_t g) const
+  { return g < first ? -1 : g <= last ? 0 : +1; }
+
+  bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this));
+  }
+
+  bool intersects (const hb_set_t *glyphs) const
+  { return glyphs->intersects (first, last); }
+
+  template <typename set_t>
+  bool collect_coverage (set_t *glyphs) const
+  { return glyphs->add_range (first, last); }
+
+  HBGlyphID	first;		/* First GlyphID in the range */
+  HBGlyphID	last;		/* Last GlyphID in the range */
+  HBUINT16	value;		/* Value */
+  public:
+  DEFINE_SIZE_STATIC (6);
+};
+DECLARE_NULL_NAMESPACE_BYTES (OT, RangeRecord);
+
+typedef RecordListOfScript ScriptList;
+#endif // ENABLE_ICCARM
+
 typedef RecordListOf<Feature> FeatureList;
 
 
diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index c17bf92..f046c08 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -535,7 +535,17 @@ struct hb_ot_apply_context_t :
     bool prev ()
     {
       assert (num_items > 0);
-      while (idx > num_items - 1)
+      /* The alternate condition below is faster at string boundaries,
+       * but produces subpar "unsafe-to-concat" values. */
+      unsigned stop = num_items - 1;
+      if (c->buffer->flags & HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT)
+	stop = 1 - 1;
+      /*When looking back, limit how far we search; this function is mostly
+       * used for looking back for base glyphs when attaching marks. If we
+       * don't limit, we can get O(n^2) behavior where n is the number of
+       * consecutive marks. */
+      stop = (unsigned) hb_max ((int) stop, (int) idx - HB_MAX_CONTEXT_LENGTH);
+      while (idx > stop)
       {
 	idx--;
 	const hb_glyph_info_t &info = c->buffer->out_info[idx];
diff --git a/src/hb-static.cc b/src/hb-static.cc
index ec4b241..bef2ce9 100644
--- a/src/hb-static.cc
+++ b/src/hb-static.cc
@@ -39,8 +39,13 @@
 #ifndef HB_NO_VISIBILITY
 #include "hb-ot-name-language-static.hh"
 
+#ifndef ENABLE_ICCARM
 uint64_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {};
 /*thread_local*/ uint64_t _hb_CrapPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {};
+#else
+uint64_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {0};
+/*thread_local*/ uint64_t _hb_CrapPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {0};
+#endif
 
 DEFINE_NULL_NAMESPACE_BYTES (OT, Index) =  {0xFF,0xFF};
 DEFINE_NULL_NAMESPACE_BYTES (OT, VarIdx) =  {0xFF,0xFF,0xFF,0xFF};