HarfBuzz: Update to version 3.3.1

77 files changed, 1705 insertions, 1117 deletions

diff --git a/thirdparty/harfbuzz/src/hb-aat-layout-common.hh b/thirdparty/harfbuzz/src/hb-aat-layout-common.hh
index 1dcbe92904..1db0f1df92 100644
--- a/thirdparty/harfbuzz/src/hb-aat-layout-common.hh
+++ b/thirdparty/harfbuzz/src/hb-aat-layout-common.hh
@@ -839,7 +839,7 @@ struct StateTableDriver
     }
 
     if (!c->in_place)
-      buffer->swap_buffers ();
+      buffer->sync ();
   }
 
   public:
diff --git a/thirdparty/harfbuzz/src/hb-aat-layout-just-table.hh b/thirdparty/harfbuzz/src/hb-aat-layout-just-table.hh
index d745c11431..0bf9bd2912 100644
--- a/thirdparty/harfbuzz/src/hb-aat-layout-just-table.hh
+++ b/thirdparty/harfbuzz/src/hb-aat-layout-just-table.hh
@@ -146,7 +146,7 @@ struct DuctileGlyphAction
   HBUINT32	variationAxis;	/* The 4-byte tag identifying the ductile axis.
 				 * This would normally be 0x64756374 ('duct'),
 				 * but you may use any axis the font contains. */
-  HBFixed	minimumLimit;	/* The lowest value for the ductility axis tha
+  HBFixed	minimumLimit;	/* The lowest value for the ductility axis that
 				 * still yields an acceptable appearance. Normally
 				 * this will be 1.0. */
   HBFixed	noStretchValue; /* This is the default value that corresponds to
diff --git a/thirdparty/harfbuzz/src/hb-algs.hh b/thirdparty/harfbuzz/src/hb-algs.hh
index 446d87e28b..3a3ab08046 100644
--- a/thirdparty/harfbuzz/src/hb-algs.hh
+++ b/thirdparty/harfbuzz/src/hb-algs.hh
@@ -36,6 +36,7 @@
 
 #include <algorithm>
 #include <initializer_list>
+#include <functional>
 #include <new>
 
 /*
@@ -210,12 +211,23 @@ struct
 }
 HB_FUNCOBJ (hb_bool);
 
+template <typename T>
+static inline
+T hb_coerce (const T v) { return v; }
+template <typename T, typename V,
+	  hb_enable_if (!hb_is_same (hb_decay<T>, hb_decay<V>) && std::is_pointer<V>::value)>
+static inline
+T hb_coerce (const V v) { return *v; }
+
 struct
 {
   private:
 
   template <typename T> constexpr auto
-  impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, hb_deref (v).hash ())
+  impl (const T& v, hb_priority<2>) const HB_RETURN (uint32_t, hb_deref (v).hash ())
+
+  template <typename T> constexpr auto
+  impl (const T& v, hb_priority<1>) const HB_RETURN (uint32_t, std::hash<hb_decay<decltype (hb_deref (v))>>{} (hb_deref (v)))
 
   template <typename T,
 	    hb_enable_if (std::is_integral<T>::value)> constexpr auto
@@ -435,23 +447,29 @@ struct
   private:
 
   template <typename T1, typename T2> auto
-  impl (T1&& v1, T2 &&v2, hb_priority<2>) const HB_AUTO_RETURN
+  impl (T1&& v1, T2 &&v2, hb_priority<3>) const HB_AUTO_RETURN
   (
     std::forward<T2> (v2).cmp (std::forward<T1> (v1)) == 0
   )
 
   template <typename T1, typename T2> auto
-  impl (T1&& v1, T2 &&v2, hb_priority<1>) const HB_AUTO_RETURN
+  impl (T1&& v1, T2 &&v2, hb_priority<2>) const HB_AUTO_RETURN
   (
     std::forward<T1> (v1).cmp (std::forward<T2> (v2)) == 0
   )
 
   template <typename T1, typename T2> auto
-  impl (T1&& v1, T2 &&v2, hb_priority<0>) const HB_AUTO_RETURN
+  impl (T1&& v1, T2 &&v2, hb_priority<1>) const HB_AUTO_RETURN
   (
     std::forward<T1> (v1) == std::forward<T2> (v2)
   )
 
+  template <typename T1, typename T2> auto
+  impl (T1&& v1, T2 &&v2, hb_priority<0>) const HB_AUTO_RETURN
+  (
+    std::forward<T2> (v2) == std::forward<T1> (v1)
+  )
+
   public:
 
   template <typename T1, typename T2> auto
@@ -472,6 +490,10 @@ struct hb_pair_t
   typedef T2 second_t;
   typedef hb_pair_t<T1, T2> pair_t;
 
+  template <typename U1 = T1, typename U2 = T2,
+	    hb_enable_if (std::is_default_constructible<U1>::value &&
+			  std::is_default_constructible<U2>::value)>
+  hb_pair_t () : first (), second () {}
   hb_pair_t (T1 a, T2 b) : first (a), second (b) {}
 
   template <typename Q1, typename Q2,
@@ -870,7 +892,7 @@ hb_bsearch_impl (unsigned *pos, /* Out */
 #pragma GCC diagnostic ignored "-Wcast-align"
     V* p = (V*) (((const char *) base) + (mid * stride));
 #pragma GCC diagnostic pop
-    int c = compar ((const void *) hb_addressof (key), (const void *) p, ds...);
+    int c = compar ((const void *) std::addressof (key), (const void *) p, ds...);
     if (c < 0)
       max = mid - 1;
     else if (c > 0)
diff --git a/thirdparty/harfbuzz/src/hb-array.hh b/thirdparty/harfbuzz/src/hb-array.hh
index 0beffb078f..1d1476d7cd 100644
--- a/thirdparty/harfbuzz/src/hb-array.hh
+++ b/thirdparty/harfbuzz/src/hb-array.hh
@@ -412,7 +412,7 @@ bool hb_array_t<T>::operator == (const hb_array_t<T> &o) const
   return true;
 }
 
-/* TODO Specialize opeator== for hb_bytes_t and hb_ubytes_t. */
+/* TODO Specialize operator== for hb_bytes_t and hb_ubytes_t. */
 
 template <>
 inline uint32_t hb_array_t<const char>::hash () const {
diff --git a/thirdparty/harfbuzz/src/hb-bimap.hh b/thirdparty/harfbuzz/src/hb-bimap.hh
index d466af8b60..a9e1278de7 100644
--- a/thirdparty/harfbuzz/src/hb-bimap.hh
+++ b/thirdparty/harfbuzz/src/hb-bimap.hh
@@ -33,20 +33,6 @@
 /* Bi-directional map */
 struct hb_bimap_t
 {
-  /* XXX(remove) */
-  void init ()
-  {
-    forw_map.init ();
-    back_map.init ();
-  }
-
-  /* XXX(remove) */
-  void fini ()
-  {
-    forw_map.fini ();
-    back_map.fini ();
-  }
-
   void reset ()
   {
     forw_map.reset ();
diff --git a/thirdparty/harfbuzz/src/hb-buffer.cc b/thirdparty/harfbuzz/src/hb-buffer.cc
index be3161a54d..e50afcb203 100644
--- a/thirdparty/harfbuzz/src/hb-buffer.cc
+++ b/thirdparty/harfbuzz/src/hb-buffer.cc
@@ -86,7 +86,46 @@ hb_segment_properties_hash (const hb_segment_properties_t *p)
 	 (intptr_t) (p->language);
 }
 
+/**
+ * hb_segment_properties_overlay:
+ * @p: #hb_segment_properties_t to fill in.
+ * @src: #hb_segment_properties_t to fill in from.
+ *
+ * Fills in missing fields of @p from @src in a considered manner.
+ *
+ * First, if @p does not have direction set, direction is copied from @src.
+ *
+ * Next, if @p and @src have the same direction (which can be unset), if @p
+ * does not have script set, script is copied from @src.
+ *
+ * Finally, if @p and @src have the same direction and script (which either
+ * can be unset), if @p does not have language set, language is copied from
+ * @src.
+ *
+ * Since: 3.3.0
+ **/
+void
+hb_segment_properties_overlay (hb_segment_properties_t *p,
+			       const hb_segment_properties_t *src)
+{
+  if (unlikely (!p || !src))
+    return;
 
+  if (!p->direction)
+    p->direction = src->direction;
+
+  if (p->direction != src->direction)
+    return;
+
+  if (!p->script)
+    p->script = src->script;
+
+  if (p->script != src->script)
+    return;
+
+  if (!p->language)
+    p->language = src->language;
+}
 
 /* Here is how the buffer works internally:
  *
@@ -96,14 +135,14 @@ hb_segment_properties_hash (const hb_segment_properties_t *p)
  * As an optimization, both info and out_info may point to the
  * same piece of memory, which is owned by info.  This remains the
  * case as long as out_len doesn't exceed i at any time.
- * In that case, swap_buffers() is mostly no-op and the glyph operations
+ * In that case, sync() is mostly no-op and the glyph operations
  * operate mostly in-place.
  *
  * As soon as out_info gets longer than info, out_info is moved over
  * to an alternate buffer (which we reuse the pos buffer for), and its
  * current contents (out_len entries) are copied to the new place.
  *
- * This should all remain transparent to the user.  swap_buffers() then
+ * This should all remain transparent to the user.  sync() then
  * switches info over to out_info and does housekeeping.
  */
 
@@ -217,11 +256,24 @@ hb_buffer_t::get_scratch_buffer (unsigned int *size)
 /* HarfBuzz-Internal API */
 
 void
+hb_buffer_t::similar (const hb_buffer_t &src)
+{
+  hb_unicode_funcs_destroy (unicode);
+  unicode = hb_unicode_funcs_reference (src.unicode);
+  flags = src.flags;
+  cluster_level = src.cluster_level;
+  replacement = src.invisible;
+  invisible = src.invisible;
+  not_found = src.not_found;
+}
+
+void
 hb_buffer_t::reset ()
 {
   hb_unicode_funcs_destroy (unicode);
   unicode = hb_unicode_funcs_reference (hb_unicode_funcs_get_default ());
   flags = HB_BUFFER_FLAG_DEFAULT;
+  cluster_level = HB_BUFFER_CLUSTER_LEVEL_DEFAULT;
   replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
   invisible = 0;
   not_found = 0;
@@ -232,11 +284,10 @@ hb_buffer_t::reset ()
 void
 hb_buffer_t::clear ()
 {
+  content_type = HB_BUFFER_CONTENT_TYPE_INVALID;
   hb_segment_properties_t default_props = HB_SEGMENT_PROPERTIES_DEFAULT;
   props = default_props;
-  scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
 
-  content_type = HB_BUFFER_CONTENT_TYPE_INVALID;
   successful = true;
   have_output = false;
   have_positions = false;
@@ -244,16 +295,44 @@ hb_buffer_t::clear ()
   idx = 0;
   len = 0;
   out_len = 0;
-  out_info = info;
 
-  serial = 0;
+  out_info = info;
 
   memset (context, 0, sizeof context);
   memset (context_len, 0, sizeof context_len);
 
   deallocate_var_all ();
+  serial = 0;
+  scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
+}
+
+void
+hb_buffer_t::enter ()
+{
+  deallocate_var_all ();
+  serial = 0;
+  scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
+  if (likely (!hb_unsigned_mul_overflows (len, HB_BUFFER_MAX_LEN_FACTOR)))
+  {
+    max_len = hb_max (len * HB_BUFFER_MAX_LEN_FACTOR,
+		      (unsigned) HB_BUFFER_MAX_LEN_MIN);
+  }
+  if (likely (!hb_unsigned_mul_overflows (len, HB_BUFFER_MAX_OPS_FACTOR)))
+  {
+    max_ops = hb_max (len * HB_BUFFER_MAX_OPS_FACTOR,
+		      (unsigned) HB_BUFFER_MAX_OPS_MIN);
+  }
+}
+void
+hb_buffer_t::leave ()
+{
+  max_len = HB_BUFFER_MAX_LEN_DEFAULT;
+  max_ops = HB_BUFFER_MAX_OPS_DEFAULT;
+  deallocate_var_all ();
+  serial = 0;
 }
 
+
 void
 hb_buffer_t::add (hb_codepoint_t  codepoint,
 		  unsigned int    cluster)
@@ -307,7 +386,7 @@ hb_buffer_t::clear_positions ()
 }
 
 void
-hb_buffer_t::swap_buffers ()
+hb_buffer_t::sync ()
 {
   assert (have_output);
 
@@ -494,33 +573,6 @@ done:
 }
 
 void
-hb_buffer_t::unsafe_to_break_impl (unsigned int start, unsigned int end)
-{
-  unsigned int cluster = UINT_MAX;
-  cluster = _infos_find_min_cluster (info, start, end, cluster);
-  _unsafe_to_break_set_mask (info, start, end, cluster);
-}
-void
-hb_buffer_t::unsafe_to_break_from_outbuffer (unsigned int start, unsigned int end)
-{
-  if (!have_output)
-  {
-    unsafe_to_break_impl (start, end);
-    return;
-  }
-
-  assert (start <= out_len);
-  assert (idx <= end);
-
-  unsigned int cluster = UINT_MAX;
-  cluster = _infos_find_min_cluster (out_info, start, out_len, cluster);
-  cluster = _infos_find_min_cluster (info, idx, end, cluster);
-
-  _unsafe_to_break_set_mask (out_info, start, out_len, cluster);
-  _unsafe_to_break_set_mask (info, idx, end, cluster);
-}
-
-void
 hb_buffer_t::guess_segment_properties ()
 {
   assert_unicode ();
@@ -565,12 +617,11 @@ DEFINE_NULL_INSTANCE (hb_buffer_t) =
   HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT,
   0, /* invisible */
   0, /* not_found */
-  HB_BUFFER_SCRATCH_FLAG_DEFAULT,
-  HB_BUFFER_MAX_LEN_DEFAULT,
-  HB_BUFFER_MAX_OPS_DEFAULT,
+
 
   HB_BUFFER_CONTENT_TYPE_INVALID,
   HB_SEGMENT_PROPERTIES_DEFAULT,
+
   false, /* successful */
   false, /* have_output */
   true  /* have_positions */
@@ -610,6 +661,46 @@ hb_buffer_create ()
 }
 
 /**
+ * hb_buffer_create_similar:
+ * @src: An #hb_buffer_t
+ *
+ * Creates a new #hb_buffer_t, similar to hb_buffer_create(). The only
+ * difference is that the buffer is configured similarly to @src.
+ *
+ * Return value: (transfer full):
+ * A newly allocated #hb_buffer_t, similar to hb_buffer_create().
+ *
+ * Since: 3.3.0
+ **/
+hb_buffer_t *
+hb_buffer_create_similar (const hb_buffer_t *src)
+{
+  hb_buffer_t *buffer = hb_buffer_create ();
+
+  buffer->similar (*src);
+
+  return buffer;
+}
+
+/**
+ * hb_buffer_reset:
+ * @buffer: An #hb_buffer_t
+ *
+ * Resets the buffer to its initial status, as if it was just newly created
+ * with hb_buffer_create().
+ *
+ * Since: 0.9.2
+ **/
+void
+hb_buffer_reset (hb_buffer_t *buffer)
+{
+  if (unlikely (hb_object_is_immutable (buffer)))
+    return;
+
+  buffer->reset ();
+}
+
+/**
  * hb_buffer_get_empty:
  *
  * Fetches an empty #hb_buffer_t.
@@ -1157,24 +1248,6 @@ hb_buffer_get_not_found_glyph (hb_buffer_t    *buffer)
 
 
 /**
- * hb_buffer_reset:
- * @buffer: An #hb_buffer_t
- *
- * Resets the buffer to its initial status, as if it was just newly created
- * with hb_buffer_create().
- *
- * Since: 0.9.2
- **/
-void
-hb_buffer_reset (hb_buffer_t *buffer)
-{
-  if (unlikely (hb_object_is_immutable (buffer)))
-    return;
-
-  buffer->reset ();
-}
-
-/**
  * hb_buffer_clear_contents:
  * @buffer: An #hb_buffer_t
  *
@@ -1749,6 +1822,8 @@ hb_buffer_append (hb_buffer_t *buffer,
   if (!buffer->have_positions && source->have_positions)
     buffer->clear_positions ();
 
+  hb_segment_properties_overlay (&buffer->props, &source->props);
+
   memcpy (buffer->info + orig_len, source->info + start, (end - start) * sizeof (buffer->info[0]));
   if (buffer->have_positions)
     memcpy (buffer->pos + orig_len, source->pos + start, (end - start) * sizeof (buffer->pos[0]));
diff --git a/thirdparty/harfbuzz/src/hb-buffer.h b/thirdparty/harfbuzz/src/hb-buffer.h
index a183cb9d4a..9fbd7b1ec3 100644
--- a/thirdparty/harfbuzz/src/hb-buffer.h
+++ b/thirdparty/harfbuzz/src/hb-buffer.h
@@ -76,18 +76,68 @@ typedef struct hb_glyph_info_t {
  * @HB_GLYPH_FLAG_UNSAFE_TO_BREAK: Indicates that if input text is broken at the
  * 				   beginning of the cluster this glyph is part of,
  * 				   then both sides need to be re-shaped, as the
- * 				   result might be different.  On the flip side,
- * 				   it means that when this flag is not present,
- * 				   then it's safe to break the glyph-run at the
- * 				   beginning of this cluster, and the two sides
- * 				   represent the exact same result one would get
- * 				   if breaking input text at the beginning of
- * 				   this cluster and shaping the two sides
- * 				   separately.  This can be used to optimize
- * 				   paragraph layout, by avoiding re-shaping
- * 				   of each line after line-breaking, or limiting
- * 				   the reshaping to a small piece around the
- * 				   breaking point only.
+ * 				   result might be different.
+ * 				   On the flip side, it means that when this
+ * 				   flag is not present, then it is safe to break
+ * 				   the glyph-run at the beginning of this
+ * 				   cluster, and the two sides will represent the
+ * 				   exact same result one would get if breaking
+ * 				   input text at the beginning of this cluster
+ * 				   and shaping the two sides separately.
+ * 				   This can be used to optimize paragraph
+ * 				   layout, by avoiding re-shaping of each line
+ * 				   after line-breaking.
+ * @HB_GLYPH_FLAG_UNSAFE_TO_CONCAT: Indicates that if input text is changed on one
+ * 				   side of the beginning of the cluster this glyph
+ * 				   is part of, then the shaping results for the
+ * 				   other side might change.
+ * 				   Note that the absence of this flag will NOT by
+ * 				   itself mean that it IS safe to concat text.
+ * 				   Only two pieces of text both of which clear of
+ * 				   this flag can be concatenated safely.
+ * 				   This can be used to optimize paragraph
+ * 				   layout, by avoiding re-shaping of each line
+ * 				   after line-breaking, by limiting the
+ * 				   reshaping to a small piece around the
+ * 				   breaking positin only, even if the breaking
+ * 				   position carries the
+ * 				   #HB_GLYPH_FLAG_UNSAFE_TO_BREAK or when
+ * 				   hyphenation or other text transformation
+ * 				   happens at line-break position, in the following
+ * 				   way:
+ * 				   1. Iterate back from the line-break position
+ * 				   until the first cluster start position that is
+ * 				   NOT unsafe-to-concat, 2. shape the segment from
+ * 				   there till the end of line, 3. check whether the
+ * 				   resulting glyph-run also is clear of the
+ * 				   unsafe-to-concat at its start-of-text position;
+ * 				   if it is, just splice it into place and the line
+ * 				   is shaped; If not, move on to a position further
+ * 				   back that is clear of unsafe-to-concat and retry
+ * 				   from there, and repeat.
+ * 				   At the start of next line a similar algorithm can
+ * 				   be implemented. That is: 1. Iterate forward from
+ * 				   the line-break position untill the first cluster
+ * 				   start position that is NOT unsafe-to-concat, 2.
+ * 				   shape the segment from beginning of the line to
+ * 				   that position, 3. check whether the resulting
+ * 				   glyph-run also is clear of the unsafe-to-concat
+ * 				   at its end-of-text position; if it is, just splice
+ * 				   it into place and the beginning is shaped; If not,
+ * 				   move on to a position further forward that is clear
+ * 				   of unsafe-to-concat and retry up to there, and repeat.
+ * 				   A slight complication will arise in the
+ * 				   implementation of the algorithm above,
+ * 				   because while our buffer API has a way to
+ * 				   return flags for position corresponding to
+ * 				   start-of-text, there is currently no position
+ * 				   corresponding to end-of-text.  This limitation
+ * 				   can be alleviated by shaping more text than needed
+ * 				   and looking for unsafe-to-concat flag within text
+ * 				   clusters.
+ * 				   The #HB_GLYPH_FLAG_UNSAFE_TO_BREAK flag will
+ * 				   always imply this flag.
+ * 				   Since: 3.3.0
  * @HB_GLYPH_FLAG_DEFINED: All the currently defined flags.
  *
  * Flags for #hb_glyph_info_t.
@@ -96,8 +146,9 @@ typedef struct hb_glyph_info_t {
  */
 typedef enum { /*< flags >*/
   HB_GLYPH_FLAG_UNSAFE_TO_BREAK		= 0x00000001,
+  HB_GLYPH_FLAG_UNSAFE_TO_CONCAT	= 0x00000002,
 
-  HB_GLYPH_FLAG_DEFINED			= 0x00000001 /* OR of all defined flags */
+  HB_GLYPH_FLAG_DEFINED			= 0x00000003 /* OR of all defined flags */
 } hb_glyph_flags_t;
 
 HB_EXTERN hb_glyph_flags_t
@@ -170,6 +221,9 @@ hb_segment_properties_equal (const hb_segment_properties_t *a,
 HB_EXTERN unsigned int
 hb_segment_properties_hash (const hb_segment_properties_t *p);
 
+HB_EXTERN void
+hb_segment_properties_overlay (hb_segment_properties_t *p,
+			       const hb_segment_properties_t *src);
 
 
 /**
@@ -185,6 +239,13 @@ HB_EXTERN hb_buffer_t *
 hb_buffer_create (void);
 
 HB_EXTERN hb_buffer_t *
+hb_buffer_create_similar (const hb_buffer_t *src);
+
+HB_EXTERN void
+hb_buffer_reset (hb_buffer_t *buffer);
+
+
+HB_EXTERN hb_buffer_t *
 hb_buffer_get_empty (void);
 
 HB_EXTERN hb_buffer_t *
@@ -391,8 +452,9 @@ HB_EXTERN hb_codepoint_t
 hb_buffer_get_not_found_glyph (hb_buffer_t    *buffer);
 
 
-HB_EXTERN void
-hb_buffer_reset (hb_buffer_t *buffer);
+/*
+ * Content API.
+ */
 
 HB_EXTERN void
 hb_buffer_clear_contents (hb_buffer_t *buffer);
diff --git a/thirdparty/harfbuzz/src/hb-buffer.hh b/thirdparty/harfbuzz/src/hb-buffer.hh
index 0f8140f1b3..adf4aa2b6f 100644
--- a/thirdparty/harfbuzz/src/hb-buffer.hh
+++ b/thirdparty/harfbuzz/src/hb-buffer.hh
@@ -67,8 +67,8 @@ enum hb_buffer_scratch_flags_t {
   HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES		= 0x00000002u,
   HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK		= 0x00000004u,
   HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT		= 0x00000008u,
-  HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK		= 0x00000010u,
-  HB_BUFFER_SCRATCH_FLAG_HAS_CGJ			= 0x00000020u,
+  HB_BUFFER_SCRATCH_FLAG_HAS_CGJ			= 0x00000010u,
+  HB_BUFFER_SCRATCH_FLAG_HAS_GLYPH_FLAGS		= 0x00000020u,
 
   /* Reserved for complex shapers' internal use. */
   HB_BUFFER_SCRATCH_FLAG_COMPLEX0			= 0x01000000u,
@@ -87,18 +87,21 @@ struct hb_buffer_t
 {
   hb_object_header_t header;
 
-  /* Information about how the text in the buffer should be treated */
+  /*
+   * Information about how the text in the buffer should be treated.
+   */
+
   hb_unicode_funcs_t *unicode; /* Unicode functions */
   hb_buffer_flags_t flags; /* BOT / EOT / etc. */
   hb_buffer_cluster_level_t cluster_level;
   hb_codepoint_t replacement; /* U+FFFD or something else. */
   hb_codepoint_t invisible; /* 0 or something else. */
   hb_codepoint_t not_found; /* 0 or something else. */
-  hb_buffer_scratch_flags_t scratch_flags; /* Have space-fallback, etc. */
-  unsigned int max_len; /* Maximum allowed len. */
-  int max_ops; /* Maximum allowed operations. */
 
-  /* Buffer contents */
+  /*
+   * Buffer contents
+   */
+
   hb_buffer_content_type_t content_type;
   hb_segment_properties_t props; /* Script, language, direction */
 
@@ -115,8 +118,6 @@ struct hb_buffer_t
   hb_glyph_info_t     *out_info;
   hb_glyph_position_t *pos;
 
-  unsigned int serial;
-
   /* Text before / after the main buffer contents.
    * Always in Unicode, and ordered outward.
    * Index 0 is for "pre-context", 1 for "post-context". */
@@ -124,7 +125,25 @@ struct hb_buffer_t
   hb_codepoint_t context[2][CONTEXT_LENGTH];
   unsigned int context_len[2];
 
-  /* Debugging API */
+
+  /*
+   * Managed by enter / leave
+   */
+
+#ifndef HB_NDEBUG
+  uint8_t allocated_var_bits;
+#endif
+  uint8_t serial;
+  hb_buffer_scratch_flags_t scratch_flags; /* Have space-fallback, etc. */
+  unsigned int max_len; /* Maximum allowed len. */
+  int max_ops; /* Maximum allowed operations. */
+  /* The bits here reflect current allocations of the bytes in glyph_info_t's var1 and var2. */
+
+
+  /*
+   * Messaging callback
+   */
+
 #ifndef HB_NO_BUFFER_MESSAGE
   hb_buffer_message_func_t message_func;
   void *message_data;
@@ -134,11 +153,6 @@ struct hb_buffer_t
   static constexpr unsigned message_depth = 0u;
 #endif
 
-  /* Internal debugging. */
-  /* The bits here reflect current allocations of the bytes in glyph_info_t's var1 and var2. */
-#ifndef HB_NDEBUG
-  uint8_t allocated_var_bits;
-#endif
 
 
   /* Methods */
@@ -190,12 +204,17 @@ struct hb_buffer_t
   hb_glyph_info_t &prev ()      { return out_info[out_len ? out_len - 1 : 0]; }
   hb_glyph_info_t prev () const { return out_info[out_len ? out_len - 1 : 0]; }
 
+  HB_INTERNAL void similar (const hb_buffer_t &src);
   HB_INTERNAL void reset ();
   HB_INTERNAL void clear ();
 
+  /* Called around shape() */
+  HB_INTERNAL void enter ();
+  HB_INTERNAL void leave ();
+
   unsigned int backtrack_len () const { return have_output ? out_len : idx; }
   unsigned int lookahead_len () const { return len - idx; }
-  unsigned int next_serial () { return serial++; }
+  uint8_t next_serial () { return ++serial ? serial : ++serial; }
 
   HB_INTERNAL void add (hb_codepoint_t  codepoint,
 			unsigned int    cluster);
@@ -252,7 +271,7 @@ struct hb_buffer_t
 
   HB_INTERNAL void guess_segment_properties ();
 
-  HB_INTERNAL void swap_buffers ();
+  HB_INTERNAL void sync ();
   HB_INTERNAL void clear_output ();
   HB_INTERNAL void clear_positions ();
 
@@ -366,15 +385,80 @@ struct hb_buffer_t
   /* Merge clusters for deleting current glyph, and skip it. */
   HB_INTERNAL void delete_glyph ();
 
-  void unsafe_to_break (unsigned int start,
-			unsigned int end)
+
+  void set_glyph_flags (hb_mask_t mask,
+			unsigned start = 0,
+			unsigned end = (unsigned) -1,
+			bool interior = false,
+			bool from_out_buffer = false)
   {
-    if (end - start < 2)
+    end = hb_min (end, len);
+
+    if (interior && !from_out_buffer && end - start < 2)
       return;
-    unsafe_to_break_impl (start, end);
+
+    scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GLYPH_FLAGS;
+
+    if (!from_out_buffer || !have_output)
+    {
+      if (!interior)
+      {
+	for (unsigned i = start; i < end; i++)
+	  info[i].mask |= mask;
+      }
+      else
+      {
+	unsigned cluster = _infos_find_min_cluster (info, start, end);
+	_infos_set_glyph_flags (info, start, end, cluster, mask);
+      }
+    }
+    else
+    {
+      assert (start <= out_len);
+      assert (idx <= end);
+
+      if (!interior)
+      {
+	for (unsigned i = start; i < out_len; i++)
+	  out_info[i].mask |= mask;
+	for (unsigned i = idx; i < end; i++)
+	  info[i].mask |= mask;
+      }
+      else
+      {
+	unsigned cluster = _infos_find_min_cluster (info, idx, end);
+	cluster = _infos_find_min_cluster (out_info, start, out_len, cluster);
+
+	_infos_set_glyph_flags (out_info, start, out_len, cluster, mask);
+	_infos_set_glyph_flags (info, idx, end, cluster, mask);
+      }
+    }
+  }
+
+  void unsafe_to_break (unsigned int start = 0, unsigned int end = -1)
+  {
+    set_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_BREAK | HB_GLYPH_FLAG_UNSAFE_TO_CONCAT,
+		     start, end,
+		     true);
+  }
+  void unsafe_to_concat (unsigned int start = 0, unsigned int end = -1)
+  {
+    set_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_CONCAT,
+		     start, end,
+		     true);
+  }
+  void unsafe_to_break_from_outbuffer (unsigned int start = 0, unsigned int end = -1)
+  {
+    set_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_BREAK | HB_GLYPH_FLAG_UNSAFE_TO_CONCAT,
+		     start, end,
+		     true, true);
+  }
+  void unsafe_to_concat_from_outbuffer (unsigned int start = 0, unsigned int end = -1)
+  {
+    set_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_CONCAT,
+		     start, end,
+		     false, true);
   }
-  HB_INTERNAL void unsafe_to_break_impl (unsigned int start, unsigned int end);
-  HB_INTERNAL void unsafe_to_break_from_outbuffer (unsigned int start, unsigned int end);
 
 
   /* Internal methods */
@@ -465,36 +549,31 @@ struct hb_buffer_t
   set_cluster (hb_glyph_info_t &inf, unsigned int cluster, unsigned int mask = 0)
   {
     if (inf.cluster != cluster)
-    {
-      if (mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK)
-	inf.mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
-      else
-	inf.mask &= ~HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
-    }
+      inf.mask = (inf.mask & ~HB_GLYPH_FLAG_DEFINED) | (mask & HB_GLYPH_FLAG_DEFINED);
     inf.cluster = cluster;
   }
-
+  void
+  _infos_set_glyph_flags (hb_glyph_info_t *infos,
+			  unsigned int start, unsigned int end,
+			  unsigned int cluster,
+			  hb_mask_t mask)
+  {
+    for (unsigned int i = start; i < end; i++)
+      if (cluster != infos[i].cluster)
+      {
+	scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GLYPH_FLAGS;
+	infos[i].mask |= mask;
+      }
+  }
   static unsigned
   _infos_find_min_cluster (const hb_glyph_info_t *infos,
 			   unsigned start, unsigned end,
-			   unsigned cluster)
+			   unsigned cluster = UINT_MAX)
   {
     for (unsigned int i = start; i < end; i++)
       cluster = hb_min (cluster, infos[i].cluster);
     return cluster;
   }
-  void
-  _unsafe_to_break_set_mask (hb_glyph_info_t *infos,
-			     unsigned int start, unsigned int end,
-			     unsigned int cluster)
-  {
-    for (unsigned int i = start; i < end; i++)
-      if (cluster != infos[i].cluster)
-      {
-	scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK;
-	infos[i].mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
-      }
-  }
 
   void clear_glyph_flags (hb_mask_t mask = 0)
   {
diff --git a/thirdparty/harfbuzz/src/hb-cff-interp-common.hh b/thirdparty/harfbuzz/src/hb-cff-interp-common.hh
index c251e2d0ed..641de0eff2 100644
--- a/thirdparty/harfbuzz/src/hb-cff-interp-common.hh
+++ b/thirdparty/harfbuzz/src/hb-cff-interp-common.hh
@@ -217,9 +217,6 @@ inline unsigned int OpCode_Size (op_code_t op) { return Is_OpCode_ESC (op) ? 2:
 
 struct number_t
 {
-  void init () { set_real (0.0); }
-  void fini () {}
-
   void set_int (int v)       { value = v; }
   int to_int () const        { return value; }
 
@@ -245,7 +242,7 @@ struct number_t
   }
 
   protected:
-  double value;
+  double value = 0.;
 };
 
 /* byte string */
@@ -380,10 +377,8 @@ struct cff_stack_t
     count = 0;
     elements.init ();
     elements.resize (kSizeLimit);
-    for (unsigned int i = 0; i < elements.length; i++)
-      elements[i].init ();
   }
-  void fini () { elements.fini_deep (); }
+  void fini () { elements.fini (); }
 
   ELEM& operator [] (unsigned int i)
   {
@@ -523,9 +518,6 @@ struct arg_stack_t : cff_stack_t<ARG, 513>
 /* an operator prefixed by its operands in a byte string */
 struct op_str_t
 {
-  void init () {}
-  void fini () {}
-
   op_code_t  op;
   byte_str_t str;
 };
@@ -553,7 +545,7 @@ struct parsed_values_t
     opStart = 0;
     values.init ();
   }
-  void fini () { values.fini_deep (); }
+  void fini () { values.fini (); }
 
   void add_op (op_code_t op, const byte_str_ref_t& str_ref = byte_str_ref_t ())
   {
diff --git a/thirdparty/harfbuzz/src/hb-cff-interp-cs-common.hh b/thirdparty/harfbuzz/src/hb-cff-interp-cs-common.hh
index 52d778ffe2..ef299369b5 100644
--- a/thirdparty/harfbuzz/src/hb-cff-interp-cs-common.hh
+++ b/thirdparty/harfbuzz/src/hb-cff-interp-cs-common.hh
@@ -94,12 +94,6 @@ struct biased_subrs_t
 
 struct point_t
 {
-  void init ()
-  {
-    x.init ();
-    y.init ();
-  }
-
   void set_int (int _x, int _y)
   {
     x.set_int (_x);
@@ -128,7 +122,7 @@ struct cs_interp_env_t : interp_env_t<ARG>
     hstem_count = 0;
     vstem_count = 0;
     hintmask_size = 0;
-    pt.init ();
+    pt.set_int (0, 0);
     callStack.init ();
     globalSubrs.init (globalSubrs_);
     localSubrs.init (localSubrs_);
@@ -841,7 +835,6 @@ struct path_procs_t
     if (likely (env.argStack.get_count () == 11))
     {
       point_t d;
-      d.init ();
       for (unsigned int i = 0; i < 10; i += 2)
 	d.move (env.eval_arg (i), env.eval_arg (i+1));
 
diff --git a/thirdparty/harfbuzz/src/hb-cff2-interp-cs.hh b/thirdparty/harfbuzz/src/hb-cff2-interp-cs.hh
index d961566447..766183760e 100644
--- a/thirdparty/harfbuzz/src/hb-cff2-interp-cs.hh
+++ b/thirdparty/harfbuzz/src/hb-cff2-interp-cs.hh
@@ -35,18 +35,6 @@ using namespace OT;
 
 struct blend_arg_t : number_t
 {
-  void init ()
-  {
-    number_t::init ();
-    deltas.init ();
-  }
-
-  void fini ()
-  {
-    number_t::fini ();
-    deltas.fini_deep ();
-  }
-
   void set_int (int v) { reset_blends (); number_t::set_int (v); }
   void set_fixed (int32_t v) { reset_blends (); number_t::set_fixed (v); }
   void set_real (double v) { reset_blends (); number_t::set_real (v); }
@@ -202,7 +190,7 @@ struct cff2_cs_opset_t : cs_opset_t<blend_arg_t, OPSET, cff2_cs_interp_env_t, PA
     switch (op) {
       case OpCode_callsubr:
       case OpCode_callgsubr:
-	/* a subroutine number shoudln't be a blended value */
+	/* a subroutine number shouldn't be a blended value */
 	if (unlikely (env.argStack.peek ().blending ()))
 	{
 	  env.set_error ();
diff --git a/thirdparty/harfbuzz/src/hb-common.cc b/thirdparty/harfbuzz/src/hb-common.cc
index 26c8ad0f49..249a8a8010 100644
--- a/thirdparty/harfbuzz/src/hb-common.cc
+++ b/thirdparty/harfbuzz/src/hb-common.cc
@@ -29,10 +29,31 @@
 #include "hb.hh"
 #include "hb-machinery.hh"
 
+#if !defined(HB_NO_SETLOCALE) && (!defined(HAVE_NEWLOCALE) || !defined(HAVE_USELOCALE))
+#define HB_NO_SETLOCALE 1
+#endif
+
+#ifndef HB_NO_SETLOCALE
+
 #include <locale.h>
+#ifdef HAVE_XLOCALE_H
+#include <xlocale.h> // Needed on BSD/OS X for uselocale
+#endif
+
+#ifdef WIN32
+#define hb_locale_t _locale_t
+#else
+#define hb_locale_t locale_t
+#endif
+#define hb_setlocale setlocale
+#define hb_uselocale uselocale
+
+#else
+
+#define hb_locale_t void *
+#define hb_setlocale(Category, Locale) "C"
+#define hb_uselocale(Locale) ((hb_locale_t) 0)
 
-#ifdef HB_NO_SETLOCALE
-#define setlocale(Category, Locale) "C"
 #endif
 
 /**
@@ -122,7 +143,7 @@ hb_tag_from_string (const char *str, int len)
  * @tag: #hb_tag_t to convert
  * @buf: (out caller-allocates) (array fixed-size=4) (element-type uint8_t): Converted string
  *
- * Converts an #hb_tag_t to a string and returns it in @buf. 
+ * Converts an #hb_tag_t to a string and returns it in @buf.
  * Strings will be four characters long.
  *
  * Since: 0.9.5
@@ -151,13 +172,13 @@ const char direction_strings[][4] = {
  * @str: (array length=len) (element-type uint8_t): String to convert
  * @len: Length of @str, or -1 if it is %NULL-terminated
  *
- * Converts a string to an #hb_direction_t. 
+ * Converts a string to an #hb_direction_t.
  *
  * Matching is loose and applies only to the first letter. For
  * examples, "LTR" and "left-to-right" will both return #HB_DIRECTION_LTR.
  *
  * Unmatched strings will return #HB_DIRECTION_INVALID.
- * 
+ *
  * Return value: The #hb_direction_t matching @str
  *
  * Since: 0.9.2
@@ -413,7 +434,7 @@ hb_language_get_default ()
   hb_language_t language = default_language;
   if (unlikely (language == HB_LANGUAGE_INVALID))
   {
-    language = hb_language_from_string (setlocale (LC_CTYPE, nullptr), -1);
+    language = hb_language_from_string (hb_setlocale (LC_CTYPE, nullptr), -1);
     (void) default_language.cmpexch (HB_LANGUAGE_INVALID, language);
   }
 
@@ -1039,6 +1060,47 @@ hb_variation_from_string (const char *str, int len,
   return false;
 }
 
+#ifndef HB_NO_SETLOCALE
+
+static inline void free_static_C_locale ();
+
+static struct hb_C_locale_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<hb_locale_t>,
+							     hb_C_locale_lazy_loader_t>
+{
+  static hb_locale_t create ()
+  {
+    hb_locale_t l = newlocale (LC_ALL_MASK, "C", NULL);
+    if (!l)
+      return l;
+
+    hb_atexit (free_static_C_locale);
+
+    return l;
+  }
+  static void destroy (hb_locale_t l)
+  {
+    freelocale (l);
+  }
+  static hb_locale_t get_null ()
+  {
+    return (hb_locale_t) 0;
+  }
+} static_C_locale;
+
+static inline
+void free_static_C_locale ()
+{
+  static_C_locale.free_instance ();
+}
+
+static hb_locale_t
+get_C_locale ()
+{
+  return static_C_locale.get_unconst ();
+}
+
+#endif
+
 /**
  * hb_variation_to_string:
  * @variation: an #hb_variation_t to convert
@@ -1064,7 +1126,11 @@ hb_variation_to_string (hb_variation_t *variation,
   while (len && s[len - 1] == ' ')
     len--;
   s[len++] = '=';
+
+  hb_locale_t oldlocale HB_UNUSED;
+  oldlocale = hb_uselocale (get_C_locale ());
   len += hb_max (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%g", (double) variation->value));
+  (void) hb_uselocale (oldlocale);
 
   assert (len < ARRAY_LENGTH (s));
   len = hb_min (len, size - 1);
diff --git a/thirdparty/harfbuzz/src/hb-coretext.cc b/thirdparty/harfbuzz/src/hb-coretext.cc
index a512f3b8b7..5f383064c4 100644
--- a/thirdparty/harfbuzz/src/hb-coretext.cc
+++ b/thirdparty/harfbuzz/src/hb-coretext.cc
@@ -481,8 +481,8 @@ struct active_feature_t {
 	   a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 :
 	   0;
   }
-  bool operator== (const active_feature_t *f) {
-    return cmp (this, f) == 0;
+  bool operator== (const active_feature_t& f) const {
+    return cmp (this, &f) == 0;
   }
 };
 
@@ -677,7 +677,7 @@ _hb_coretext_shape (hb_shape_plan_t    *shape_plan,
       {
 	active_features.push (event->feature);
       } else {
-	active_feature_t *feature = active_features.find (&event->feature);
+	active_feature_t *feature = active_features.lsearch (event->feature);
 	if (feature)
 	  active_features.remove (feature - active_features.arrayZ);
       }
@@ -1213,7 +1213,8 @@ resize_and_retry:
     }
   }
 
-  buffer->clear_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_BREAK);
+  buffer->clear_glyph_flags ();
+  buffer->unsafe_to_break ();
 
 #undef FAIL
 
diff --git a/thirdparty/harfbuzz/src/hb-directwrite.cc b/thirdparty/harfbuzz/src/hb-directwrite.cc
index dea87b8cd0..f177ff31c0 100644
--- a/thirdparty/harfbuzz/src/hb-directwrite.cc
+++ b/thirdparty/harfbuzz/src/hb-directwrite.cc
@@ -762,7 +762,8 @@ retry_getglyphs:
 
   if (isRightToLeft) hb_buffer_reverse (buffer);
 
-  buffer->clear_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_BREAK);
+  buffer->clear_glyph_flags ();
+  buffer->unsafe_to_break ();
 
   delete [] clusterMap;
   delete [] glyphIndices;
diff --git a/thirdparty/harfbuzz/src/hb-draw.h b/thirdparty/harfbuzz/src/hb-draw.h
index bddc876399..f82cc34842 100644
--- a/thirdparty/harfbuzz/src/hb-draw.h
+++ b/thirdparty/harfbuzz/src/hb-draw.h
@@ -50,7 +50,7 @@ typedef void (*hb_draw_close_path_func_t) (void *user_data);
  *
  * Glyph draw callbacks.
  *
- * _move_to, _line_to and _cubic_to calls are nessecary to be defined but we
+ * _move_to, _line_to and _cubic_to calls are necessary to be defined but we
  * translate _quadratic_to calls to _cubic_to if the callback isn't defined.
  *
  * Since: EXPERIMENTAL
diff --git a/thirdparty/harfbuzz/src/hb-face.cc b/thirdparty/harfbuzz/src/hb-face.cc
index 2c0087370c..5365598636 100644
--- a/thirdparty/harfbuzz/src/hb-face.cc
+++ b/thirdparty/harfbuzz/src/hb-face.cc
@@ -143,7 +143,7 @@ hb_face_create_for_tables (hb_reference_table_func_t  reference_table_func,
 
 typedef struct hb_face_for_data_closure_t {
   hb_blob_t *blob;
-  unsigned int  index;
+  uint16_t  index;
 } hb_face_for_data_closure_t;
 
 static hb_face_for_data_closure_t *
@@ -156,7 +156,7 @@ _hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
     return nullptr;
 
   closure->blob = blob;
-  closure->index = index;
+  closure->index = (uint16_t) (index & 0xFFFFu);
 
   return closure;
 }
@@ -195,9 +195,19 @@ _hb_face_for_data_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void
  * @index: The index of the face within @blob
  *
  * Constructs a new face object from the specified blob and
- * a face index into that blob. This is used for blobs of
- * file formats such as Dfont and TTC that can contain more
- * than one face.
+ * a face index into that blob.
+ *
+ * The face index is used for blobs of file formats such as TTC and
+ * and DFont that can contain more than one face.  Face indices within
+ * such collections are zero-based.
+ *
+ * <note>Note: If the blob font format is not a collection, @index
+ * is ignored.  Otherwise, only the lower 16-bits of @index are used.
+ * The unmodified @index can be accessed via hb_face_get_index().</note>
+ *
+ * <note>Note: The high 16-bits of @index, if non-zero, are used by
+ * hb_font_create() to load named-instances in variable fonts.  See
+ * hb_font_create() for details.</note>
  *
  * Return value: (transfer full): The new face object
  *
@@ -420,7 +430,8 @@ hb_face_reference_blob (hb_face_t *face)
  * Assigns the specified face-index to @face. Fails if the
  * face is immutable.
  *
- * <note>Note: face indices within a collection are zero-based.</note>
+ * <note>Note: changing the index has no effect on the face itself
+ * This only changes the value returned by hb_face_get_index().</note>
  *
  * Since: 0.9.2
  **/
diff --git a/thirdparty/harfbuzz/src/hb-font.cc b/thirdparty/harfbuzz/src/hb-font.cc
index fa8da96395..350fcac139 100644
--- a/thirdparty/harfbuzz/src/hb-font.cc
+++ b/thirdparty/harfbuzz/src/hb-font.cc
@@ -631,7 +631,7 @@ hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
  * @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 specified font-functions structure. 
+ * Attaches a user-data key/data pair to the specified font-functions structure.
  *
  * Return value: %true if success, %false otherwise
  *
@@ -821,7 +821,7 @@ hb_font_get_glyph (hb_font_t      *font,
  * @glyph: (out): The glyph ID retrieved
  *
  * Fetches the nominal glyph ID for a Unicode code point in the
- * specified font. 
+ * specified font.
  *
  * This version of the function should not be used to fetch glyph IDs
  * for code points modified by variation selectors. For variation-selector
@@ -940,7 +940,7 @@ hb_font_get_glyph_v_advance (hb_font_t      *font,
  * @advance_stride: The stride between successive advances
  *
  * Fetches the advances for a sequence of glyph IDs in the specified
- * font, for horizontal text segments. 
+ * font, for horizontal text segments.
  *
  * Since: 1.8.6
  **/
@@ -964,7 +964,7 @@ hb_font_get_glyph_h_advances (hb_font_t*            font,
  * @advance_stride: (out): The stride between successive advances
  *
  * Fetches the advances for a sequence of glyph IDs in the specified
- * font, for vertical text segments.  
+ * font, for vertical text segments.
  *
  * Since: 1.8.6
  **/
@@ -1278,7 +1278,7 @@ hb_font_get_glyph_origin_for_direction (hb_font_t      *font,
  * @font: #hb_font_t to work upon
  * @glyph: The glyph ID to query
  * @direction: The direction of the text segment
- * @x: (inout): Input = The original X coordinate 
+ * @x: (inout): Input = The original X coordinate
  *     Output = The X coordinate plus the X-coordinate of the origin
  * @y: (inout): Input = The original Y coordinate
  *     Output = The Y coordinate plus the Y-coordinate of the origin
@@ -1306,7 +1306,7 @@ hb_font_add_glyph_origin_for_direction (hb_font_t      *font,
  * @font: #hb_font_t to work upon
  * @glyph: The glyph ID to query
  * @direction: The direction of the text segment
- * @x: (inout): Input = The original X coordinate 
+ * @x: (inout): Input = The original X coordinate
  *     Output = The X coordinate minus the X-coordinate of the origin
  * @y: (inout): Input = The original Y coordinate
  *     Output = The Y coordinate minus the Y-coordinate of the origin
@@ -1477,6 +1477,8 @@ DEFINE_NULL_INSTANCE (hb_font_t) =
 
   1000, /* x_scale */
   1000, /* y_scale */
+  0., /* slant */
+  0., /* slant_xy; */
   1<<16, /* x_mult */
   1<<16, /* y_mult */
 
@@ -1521,6 +1523,13 @@ _hb_font_create (hb_face_t *face)
  *
  * Constructs a new font object from the specified face.
  *
+ * <note>Note: If @face's index value (as passed to hb_face_create()
+ * has non-zero top 16-bits, those bits minus one are passed to
+ * hb_font_set_var_named_instance(), effectively loading a named-instance
+ * of a variable font, instead of the default-instance.  This allows
+ * specifying which named-instance to load by default when creating the
+ * face.</note>
+ *
  * Return value: (transfer full): The new font object
  *
  * Since: 0.9.2
@@ -1535,6 +1544,11 @@ hb_font_create (hb_face_t *face)
   hb_ot_font_set_funcs (font);
 #endif
 
+#ifndef HB_NO_VAR
+  if (face && face->index >> 16)
+    hb_font_set_var_named_instance (font, (face->index >> 16) - 1);
+#endif
+
   return font;
 }
 
@@ -1578,6 +1592,7 @@ hb_font_create_sub_font (hb_font_t *parent)
 
   font->x_scale = parent->x_scale;
   font->y_scale = parent->y_scale;
+  font->slant = parent->slant;
   font->mults_changed ();
   font->x_ppem = parent->x_ppem;
   font->y_ppem = parent->y_ppem;
@@ -1668,12 +1683,12 @@ hb_font_destroy (hb_font_t *font)
 /**
  * hb_font_set_user_data: (skip)
  * @font: #hb_font_t to work upon
- * @key: The user-data key 
+ * @key: The user-data key
  * @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 specified font object. 
+ * Attaches a user-data key/data pair to the specified font object.
  *
  * Return value: %true if success, %false otherwise
  *
@@ -1875,7 +1890,7 @@ hb_font_set_funcs (hb_font_t         *font,
  * @font_data: (destroy destroy) (scope notified): Data to attach to @font
  * @destroy: (nullable): The function to call when @font_data is not needed anymore
  *
- * Replaces the user data attached to a font, updating the font's 
+ * Replaces the user data attached to a font, updating the font's
  * @destroy callback.
  *
  * Since: 0.9.2
@@ -1949,7 +1964,7 @@ hb_font_get_scale (hb_font_t *font,
  * @x_ppem: Horizontal ppem value to assign
  * @y_ppem: Vertical ppem value to assign
  *
- * Sets the horizontal and vertical pixels-per-em (ppem) of a font. 
+ * Sets the horizontal and vertical pixels-per-em (ppem) of a font.
  *
  * Since: 0.9.2
  **/
@@ -1971,7 +1986,7 @@ hb_font_set_ppem (hb_font_t    *font,
  * @x_ppem: (out): Horizontal ppem value
  * @y_ppem: (out): Vertical ppem value
  *
- * Fetches the horizontal and vertical points-per-em (ppem) of a font. 
+ * Fetches the horizontal and vertical points-per-em (ppem) of a font.
  *
  * Since: 0.9.2
  **/
@@ -2015,7 +2030,7 @@ hb_font_set_ptem (hb_font_t *font,
  *
  * Return value: Point size.  A value of zero means "not set."
  *
- * Since: 0.9.2
+ * Since: 1.6.0
  **/
 float
 hb_font_get_ptem (hb_font_t *font)
@@ -2023,6 +2038,49 @@ hb_font_get_ptem (hb_font_t *font)
   return font->ptem;
 }
 
+/**
+ * hb_font_set_synthetic_slant:
+ * @font: #hb_font_t to work upon
+ * @slant: synthetic slant value.
+ *
+ * Sets the "synthetic slant" of a font.  By default is zero.
+ * Synthetic slant is the graphical skew that the renderer
+ * applies to the font at rendering time.
+ *
+ * HarfBuzz needs to know this value to adjust shaping results,
+ * metrics, and style values to match the slanted rendering.
+ *
+ * <note>Note: The slant value is a ratio.  For example, a
+ * 20% slant would be represented as a 0.2 value.</note>
+ *
+ * Since: 3.3.0
+ **/
+HB_EXTERN void
+hb_font_set_synthetic_slant (hb_font_t *font, float slant)
+{
+  if (hb_object_is_immutable (font))
+    return;
+
+  font->slant = slant;
+  font->mults_changed ();
+}
+
+/**
+ * hb_font_get_synthetic_slant:
+ * @font: #hb_font_t to work upon
+ *
+ * Fetches the "synthetic slant" of a font.
+ *
+ * Return value: Synthetic slant.  By default is zero.
+ *
+ * Since: 3.3.0
+ **/
+HB_EXTERN float
+hb_font_get_synthetic_slant (hb_font_t *font)
+{
+  return font->slant;
+}
+
 #ifndef HB_NO_VAR
 /*
  * Variations
@@ -2036,6 +2094,10 @@ hb_font_get_ptem (hb_font_t *font)
  *
  * Applies a list of font-variation settings to a font.
  *
+ * Note that this overrides all existing variations set on @font.
+ * Axes not included in @variations will be effectively set to their
+ * default values.
+ *
  * Since: 1.4.2
  */
 void
@@ -2091,6 +2153,10 @@ hb_font_set_variations (hb_font_t            *font,
  * Applies a list of variation coordinates (in design-space units)
  * to a font.
  *
+ * Note that this overrides all existing variations set on @font.
+ * Axes not included in @coords will be effectively set to their
+ * default values.
+ *
  * Since: 1.4.2
  */
 void
@@ -2154,6 +2220,10 @@ hb_font_set_var_named_instance (hb_font_t *font,
  * Applies a list of variation coordinates (in normalized units)
  * to a font.
  *
+ * Note that this overrides all existing variations set on @font.
+ * Axes not included in @coords will be effectively set to their
+ * default values.
+ *
  * <note>Note: Coordinates should be normalized to 2.14.</note>
  *
  * Since: 1.4.2
@@ -2196,14 +2266,19 @@ hb_font_set_var_coords_normalized (hb_font_t    *font,
 /**
  * hb_font_get_var_coords_normalized:
  * @font: #hb_font_t to work upon
- * @length: Number of coordinates retrieved
+ * @length: (out): Number of coordinates retrieved
  *
  * Fetches the list of normalized variation coordinates currently
  * set on a font.
  *
+ * Note that this returned array may only contain values for some
+ * (or none) of the axes; omitted axes effectively have zero values.
+ *
  * Return value is valid as long as variation coordinates of the font
  * are not modified.
  *
+ * Return value: coordinates array
+ *
  * Since: 1.4.2
  */
 const int *
@@ -2216,18 +2291,24 @@ hb_font_get_var_coords_normalized (hb_font_t    *font,
   return font->coords;
 }
 
-#ifdef HB_EXPERIMENTAL_API
 /**
  * hb_font_get_var_coords_design:
  * @font: #hb_font_t to work upon
- * @length: (out): number of coordinates
+ * @length: (out): Number of coordinates retrieved
+ *
+ * Fetches the list of variation coordinates (in design-space units) currently
+ * set on a font.
+ *
+ * Note that this returned array may only contain values for some
+ * (or none) of the axes; omitted axes effectively have their default
+ * values.
  *
  * Return value is valid as long as variation coordinates of the font
  * are not modified.
  *
  * Return value: coordinates array
  *
- * Since: EXPERIMENTAL
+ * Since: 3.3.0
  */
 const float *
 hb_font_get_var_coords_design (hb_font_t *font,
@@ -2239,7 +2320,6 @@ hb_font_get_var_coords_design (hb_font_t *font,
   return font->design_coords;
 }
 #endif
-#endif
 
 #ifndef HB_DISABLE_DEPRECATED
 /*
diff --git a/thirdparty/harfbuzz/src/hb-font.h b/thirdparty/harfbuzz/src/hb-font.h
index 15dc126523..a3bbb2e37b 100644
--- a/thirdparty/harfbuzz/src/hb-font.h
+++ b/thirdparty/harfbuzz/src/hb-font.h
@@ -1024,6 +1024,12 @@ HB_EXTERN float
 hb_font_get_ptem (hb_font_t *font);
 
 HB_EXTERN void
+hb_font_set_synthetic_slant (hb_font_t *font, float slant);
+
+HB_EXTERN float
+hb_font_get_synthetic_slant (hb_font_t *font);
+
+HB_EXTERN void
 hb_font_set_variations (hb_font_t *font,
 			const hb_variation_t *variations,
 			unsigned int variations_length);
@@ -1033,11 +1039,9 @@ hb_font_set_var_coords_design (hb_font_t *font,
 			       const float *coords,
 			       unsigned int coords_length);
 
-#ifdef HB_EXPERIMENTAL_API
 HB_EXTERN const float *
 hb_font_get_var_coords_design (hb_font_t *font,
 			       unsigned int *length);
-#endif
 
 HB_EXTERN void
 hb_font_set_var_coords_normalized (hb_font_t *font,
diff --git a/thirdparty/harfbuzz/src/hb-font.hh b/thirdparty/harfbuzz/src/hb-font.hh
index 1b7f445e8b..0d73589e8c 100644
--- a/thirdparty/harfbuzz/src/hb-font.hh
+++ b/thirdparty/harfbuzz/src/hb-font.hh
@@ -109,6 +109,8 @@ struct hb_font_t
 
   int32_t x_scale;
   int32_t y_scale;
+  float slant;
+  float slant_xy;
   int64_t x_mult;
   int64_t y_mult;
 
@@ -617,6 +619,7 @@ struct hb_font_t
     signed upem = face->get_upem ();
     x_mult = ((int64_t) x_scale << 16) / upem;
     y_mult = ((int64_t) y_scale << 16) / upem;
+    slant_xy = y_scale ? slant * x_scale / y_scale : 0.f;
   }
 
   hb_position_t em_mult (int16_t v, int64_t mult)
diff --git a/thirdparty/harfbuzz/src/hb-graphite2.cc b/thirdparty/harfbuzz/src/hb-graphite2.cc
index 42420ac0b0..63dc18b466 100644
--- a/thirdparty/harfbuzz/src/hb-graphite2.cc
+++ b/thirdparty/harfbuzz/src/hb-graphite2.cc
@@ -439,7 +439,8 @@ _hb_graphite2_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,
   if (feats) gr_featureval_destroy (feats);
   gr_seg_destroy (seg);
 
-  buffer->clear_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_BREAK);
+  buffer->clear_glyph_flags ();
+  buffer->unsafe_to_break ();
 
   return true;
 }
diff --git a/thirdparty/harfbuzz/src/hb-iter.hh b/thirdparty/harfbuzz/src/hb-iter.hh
index ad2e45e3c5..43a3098f65 100644
--- a/thirdparty/harfbuzz/src/hb-iter.hh
+++ b/thirdparty/harfbuzz/src/hb-iter.hh
@@ -90,8 +90,8 @@ struct hb_iter_t
    * it will be returning pointer to temporary rvalue.
    * TODO Use a wrapper return type to fix for non-reference type. */
   template <typename T = item_t,
-	    hb_enable_if (hb_is_reference (T))>
-  hb_remove_reference<item_t>* operator -> () const { return hb_addressof (**thiz()); }
+	    hb_enable_if (std::is_reference<T>::value)>
+  hb_remove_reference<item_t>* operator -> () const { return std::addressof (**thiz()); }
   item_t operator * () const { return thiz()->__item__ (); }
   item_t operator * () { return thiz()->__item__ (); }
   item_t operator [] (unsigned i) const { return thiz()->__item_at__ (i); }
@@ -289,7 +289,7 @@ struct hb_is_source_of
 {
   private:
   template <typename Iter2 = Iter,
-	    hb_enable_if (hb_is_convertible (typename Iter2::item_t, hb_add_lvalue_reference<hb_add_const<Item>>))>
+	    hb_enable_if (hb_is_convertible (typename Iter2::item_t, hb_add_lvalue_reference<const Item>))>
   static hb_true_type impl (hb_priority<2>);
   template <typename Iter2 = Iter>
   static auto impl (hb_priority<1>) -> decltype (hb_declval (Iter2) >> hb_declval (Item &), hb_true_type ());
diff --git a/thirdparty/harfbuzz/src/hb-kern.hh b/thirdparty/harfbuzz/src/hb-kern.hh
index 3f952fe7fc..9ea945caed 100644
--- a/thirdparty/harfbuzz/src/hb-kern.hh
+++ b/thirdparty/harfbuzz/src/hb-kern.hh
@@ -49,6 +49,10 @@ struct hb_kern_machine_t
 	     hb_mask_t    kern_mask,
 	     bool         scale = true) const
   {
+    if (!buffer->message (font, "start kern"))
+      return;
+
+    buffer->unsafe_to_concat ();
     OT::hb_ot_apply_context_t c (1, font, buffer);
     c.set_lookup_mask (kern_mask);
     c.set_lookup_props (OT::LookupFlag::IgnoreMarks);
@@ -67,7 +71,8 @@ struct hb_kern_machine_t
       }
 
       skippy_iter.reset (idx, 1);
-      if (!skippy_iter.next ())
+      unsigned unsafe_to;
+      if (!skippy_iter.next (&unsafe_to))
       {
 	idx++;
 	continue;
@@ -125,6 +130,8 @@ struct hb_kern_machine_t
     skip:
       idx = skippy_iter.idx;
     }
+
+    (void) buffer->message (font, "end kern");
   }
 
   const Driver &driver;
diff --git a/thirdparty/harfbuzz/src/hb-machinery.hh b/thirdparty/harfbuzz/src/hb-machinery.hh
index 010c2570d7..5046ac1933 100644
--- a/thirdparty/harfbuzz/src/hb-machinery.hh
+++ b/thirdparty/harfbuzz/src/hb-machinery.hh
@@ -244,19 +244,19 @@ struct hb_lazy_loader_t : hb_data_wrapper_t<Data, WheresData>
   {
     Stored *p = (Stored *) hb_calloc (1, sizeof (Stored));
     if (likely (p))
-      p->init (data);
+      p = new (p) Stored (data);
     return p;
   }
   static Stored *create ()
   {
     Stored *p = (Stored *) hb_calloc (1, sizeof (Stored));
     if (likely (p))
-      p->init ();
+      p = new (p) Stored ();
     return p;
   }
   static void destroy (Stored *p)
   {
-    p->fini ();
+    p->~Stored ();
     hb_free (p);
   }
 
diff --git a/thirdparty/harfbuzz/src/hb-map.hh b/thirdparty/harfbuzz/src/hb-map.hh
index 793dcf22ca..9341637eac 100644
--- a/thirdparty/harfbuzz/src/hb-map.hh
+++ b/thirdparty/harfbuzz/src/hb-map.hh
@@ -37,13 +37,10 @@
 template <typename K, typename V,
 	  typename k_invalid_t = K,
 	  typename v_invalid_t = V,
-	  k_invalid_t kINVALID = hb_is_pointer (K) ? 0 : std::is_signed<K>::value ? hb_int_min (K) : (K) -1,
-	  v_invalid_t vINVALID = hb_is_pointer (V) ? 0 : std::is_signed<V>::value ? hb_int_min (V) : (V) -1>
+	  k_invalid_t kINVALID = std::is_pointer<K>::value ? 0 : std::is_signed<K>::value ? hb_int_min (K) : (K) -1,
+	  v_invalid_t vINVALID = std::is_pointer<V>::value ? 0 : std::is_signed<V>::value ? hb_int_min (V) : (V) -1>
 struct hb_hashmap_t
 {
-  static constexpr K INVALID_KEY   = kINVALID;
-  static constexpr V INVALID_VALUE = vINVALID;
-
   hb_hashmap_t ()  { init (); }
   ~hb_hashmap_t () { fini (); }
 
@@ -64,24 +61,40 @@ struct hb_hashmap_t
     hb_copy (o, *this);
   }
 
-  static_assert (std::is_trivially_copyable<K>::value, "");
-  static_assert (std::is_trivially_copyable<V>::value, "");
-  static_assert (std::is_trivially_destructible<K>::value, "");
-  static_assert (std::is_trivially_destructible<V>::value, "");
-
   struct item_t
   {
     K key;
     V value;
     uint32_t hash;
 
-    void clear () { key = kINVALID; value = vINVALID; hash = 0; }
+    void clear ()
+    {
+      new (std::addressof (key)) K ();
+      key = hb_coerce<K> (kINVALID);
+      new (std::addressof (value)) V ();
+      value = hb_coerce<V> (vINVALID);
+      hash = 0;
+    }
 
     bool operator == (const K &o) { return hb_deref (key) == hb_deref (o); }
     bool operator == (const item_t &o) { return *this == o.key; }
-    bool is_unused () const    { return key == kINVALID; }
-    bool is_tombstone () const { return key != kINVALID && value == vINVALID; }
-    bool is_real () const { return key != kINVALID && value != vINVALID; }
+    bool is_unused () const
+    {
+      const K inv = hb_coerce<K> (kINVALID);
+      return key == inv;
+    }
+    bool is_tombstone () const
+    {
+      const K kinv = hb_coerce<K> (kINVALID);
+      const V vinv = hb_coerce<V> (vINVALID);
+      return key != kinv && value == vinv;
+    }
+    bool is_real () const
+    {
+      const K kinv = hb_coerce<K> (kINVALID);
+      const V vinv = hb_coerce<V> (vINVALID);
+      return key != kinv && value != vinv;
+    }
     hb_pair_t<K, V> get_pair() const { return hb_pair_t<K, V> (key, value); }
   };
 
@@ -118,8 +131,13 @@ struct hb_hashmap_t
   }
   void fini_shallow ()
   {
-    hb_free (items);
-    items = nullptr;
+    if (likely (items)) {
+      unsigned size = mask + 1;
+      for (unsigned i = 0; i < size; i++)
+        items[i].~item_t ();
+      hb_free (items);
+      items = nullptr;
+    }
     population = occupancy = 0;
   }
   void fini ()
@@ -163,10 +181,15 @@ struct hb_hashmap_t
     /* Insert back old items. */
     if (old_items)
       for (unsigned int i = 0; i < old_size; i++)
+      {
 	if (old_items[i].is_real ())
+	{
 	  set_with_hash (old_items[i].key,
 			 old_items[i].hash,
 			 std::move (old_items[i].value));
+	}
+	old_items[i].~item_t ();
+      }
 
     hb_free (old_items);
 
@@ -178,22 +201,22 @@ struct hb_hashmap_t
 
   V get (K key) const
   {
-    if (unlikely (!items)) return vINVALID;
+    if (unlikely (!items)) return hb_coerce<V> (vINVALID);
     unsigned int i = bucket_for (key);
-    return items[i].is_real () && items[i] == key ? items[i].value : vINVALID;
+    return items[i].is_real () && items[i] == key ? items[i].value : hb_coerce<V> (vINVALID);
   }
 
-  void del (K key) { set (key, vINVALID); }
+  void del (K key) { set (key, hb_coerce<V> (vINVALID)); }
 
   /* Has interface. */
-  static constexpr V SENTINEL = vINVALID;
   typedef V value_t;
   value_t operator [] (K k) const { return get (k); }
   bool has (K k, V *vp = nullptr) const
   {
     V v = (*this)[k];
     if (vp) *vp = v;
-    return v != SENTINEL;
+    const V vinv = hb_coerce<V> (vINVALID);
+    return v != vinv;
   }
   /* Projection. */
   V operator () (K k) const { return get (k); }
@@ -248,11 +271,13 @@ struct hb_hashmap_t
   bool set_with_hash (K key, uint32_t hash, VV&& value)
   {
     if (unlikely (!successful)) return false;
-    if (unlikely (key == kINVALID)) return true;
+    const K kinv = hb_coerce<K> (kINVALID);
+    if (unlikely (key == kinv)) return true;
     if (unlikely ((occupancy + occupancy / 2) >= mask && !resize ())) return false;
     unsigned int i = bucket_for_hash (key, hash);
 
-    if (value == vINVALID && items[i].key != key)
+    const V vinv = hb_coerce<V> (vINVALID);
+    if (value == vinv && items[i].key != key)
       return true; /* Trying to delete non-existent key. */
 
     if (!items[i].is_unused ())
diff --git a/thirdparty/harfbuzz/src/hb-meta.hh b/thirdparty/harfbuzz/src/hb-meta.hh
index 0ea5774a9f..3fea5d995e 100644
--- a/thirdparty/harfbuzz/src/hb-meta.hh
+++ b/thirdparty/harfbuzz/src/hb-meta.hh
@@ -29,6 +29,7 @@
 
 #include "hb.hh"
 
+#include <memory>
 #include <type_traits>
 #include <utility>
 
@@ -85,30 +86,13 @@ template <>             struct hb_priority<0> {};
 template <typename T> struct hb_type_identity_t { typedef T type; };
 template <typename T> using hb_type_identity = typename hb_type_identity_t<T>::type;
 
-struct
-{
-  template <typename T> constexpr T*
-  operator () (T& arg) const
-  {
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wcast-align"
-    /* https://en.cppreference.com/w/cpp/memory/addressof */
-    return reinterpret_cast<T*> (
-	     &const_cast<char&> (
-		reinterpret_cast<const volatile char&> (arg)));
-#pragma GCC diagnostic pop
-  }
-}
-HB_FUNCOBJ (hb_addressof);
-
 template <typename T> static inline T hb_declval ();
 #define hb_declval(T) (hb_declval<T> ())
 
 template <typename T> struct hb_match_const		: hb_type_identity_t<T>, hb_false_type	{};
 template <typename T> struct hb_match_const<const T>	: hb_type_identity_t<T>, hb_true_type	{};
 template <typename T> using hb_remove_const = typename hb_match_const<T>::type;
-template <typename T> using hb_add_const = const T;
-#define hb_is_const(T) hb_match_const<T>::value
+
 template <typename T> struct hb_match_reference		: hb_type_identity_t<T>, hb_false_type	{};
 template <typename T> struct hb_match_reference<T &>	: hb_type_identity_t<T>, hb_true_type	{};
 template <typename T> struct hb_match_reference<T &&>	: hb_type_identity_t<T>, hb_true_type	{};
@@ -119,14 +103,13 @@ template <typename T> using hb_add_lvalue_reference = decltype (_hb_try_add_lval
 template <typename T> auto _hb_try_add_rvalue_reference (hb_priority<1>) -> hb_type_identity<T&&>;
 template <typename T> auto _hb_try_add_rvalue_reference (hb_priority<0>) -> hb_type_identity<T>;
 template <typename T> using hb_add_rvalue_reference = decltype (_hb_try_add_rvalue_reference<T> (hb_prioritize));
-#define hb_is_reference(T) hb_match_reference<T>::value
+
 template <typename T> struct hb_match_pointer		: hb_type_identity_t<T>, hb_false_type	{};
 template <typename T> struct hb_match_pointer<T *>	: hb_type_identity_t<T>, hb_true_type	{};
 template <typename T> using hb_remove_pointer = typename hb_match_pointer<T>::type;
 template <typename T> auto _hb_try_add_pointer (hb_priority<1>) -> hb_type_identity<hb_remove_reference<T>*>;
 template <typename T> auto _hb_try_add_pointer (hb_priority<1>) -> hb_type_identity<T>;
 template <typename T> using hb_add_pointer = decltype (_hb_try_add_pointer<T> (hb_prioritize));
-#define hb_is_pointer(T) hb_match_pointer<T>::value
 
 
 /* TODO Add feature-parity to std::decay. */
@@ -137,8 +120,8 @@ template <typename T> using hb_decay = hb_remove_const<hb_remove_reference<T>>;
 template <typename From, typename To>
 using hb_is_cr_convertible = hb_bool_constant<
   hb_is_same (hb_decay<From>, hb_decay<To>) &&
-  (!hb_is_const (From) || hb_is_const (To)) &&
-  (!hb_is_reference (To) || hb_is_const (To) || hb_is_reference (To))
+  (!std::is_const<From>::value || std::is_const<To>::value) &&
+  (!std::is_reference<To>::value || std::is_const<To>::value || std::is_reference<To>::value)
 >;
 #define hb_is_cr_convertible(From,To) hb_is_cr_convertible<From, To>::value
 
@@ -153,16 +136,6 @@ struct
 }
 HB_FUNCOBJ (hb_deref);
 
-struct
-{
-  template <typename T> constexpr auto
-  operator () (T&& v) const HB_AUTO_RETURN (std::forward<T> (v))
-
-  template <typename T> constexpr auto
-  operator () (T& v) const HB_AUTO_RETURN (hb_addressof (v))
-}
-HB_FUNCOBJ (hb_ref);
-
 template <typename T>
 struct hb_reference_wrapper
 {
@@ -176,7 +149,7 @@ struct hb_reference_wrapper
 template <typename T>
 struct hb_reference_wrapper<T&>
 {
-  hb_reference_wrapper (T& v) : v (hb_addressof (v)) {}
+  hb_reference_wrapper (T& v) : v (std::addressof (v)) {}
   bool operator == (const hb_reference_wrapper& o) const { return v == o.v; }
   bool operator != (const hb_reference_wrapper& o) const { return v != o.v; }
   operator T& () const { return *v; }
diff --git a/thirdparty/harfbuzz/src/hb-ms-feature-ranges.cc b/thirdparty/harfbuzz/src/hb-ms-feature-ranges.cc
deleted file mode 100644
index 6d09b252d8..0000000000
--- a/thirdparty/harfbuzz/src/hb-ms-feature-ranges.cc
+++ /dev/null
@@ -1,177 +0,0 @@
-/*
- * Copyright © 2011,2012,2013  Google, Inc.
- * Copyright © 2021  Khaled Hosny
- *
- *  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): Behdad Esfahbod
- */
-
-#include "hb-ms-feature-ranges.hh"
-
-bool
-hb_ms_setup_features (const hb_feature_t                *features,
-		      unsigned int                       num_features,
-		      hb_vector_t<hb_ms_feature_t>      &feature_records, /* OUT */
-		      hb_vector_t<hb_ms_range_record_t> &range_records /* OUT */)
-{
-  feature_records.shrink(0);
-  range_records.shrink(0);
-
-  /* Sort features by start/end events. */
-  hb_vector_t<hb_ms_feature_event_t> feature_events;
-  for (unsigned int i = 0; i < num_features; i++)
-  {
-    hb_ms_active_feature_t feature;
-    feature.fea.tag_le = hb_uint32_swap (features[i].tag);
-    feature.fea.value = features[i].value;
-    feature.order = i;
-
-    hb_ms_feature_event_t *event;
-
-    event = feature_events.push ();
-    event->index = features[i].start;
-    event->start = true;
-    event->feature = feature;
-
-    event = feature_events.push ();
-    event->index = features[i].end;
-    event->start = false;
-    event->feature = feature;
-  }
-  feature_events.qsort ();
-  /* Add a strategic final event. */
-  {
-    hb_ms_active_feature_t feature;
-    feature.fea.tag_le = 0;
-    feature.fea.value = 0;
-    feature.order = num_features + 1;
-
-    auto *event = feature_events.push ();
-    event->index = 0; /* This value does magic. */
-    event->start = false;
-    event->feature = feature;
-  }
-
-  /* Scan events and save features for each range. */
-  hb_vector_t<hb_ms_active_feature_t> active_features;
-  unsigned int last_index = 0;
-  for (unsigned int i = 0; i < feature_events.length; i++)
-  {
-    auto *event = &feature_events[i];
-
-    if (event->index != last_index)
-    {
-      /* Save a snapshot of active features and the range. */
-      auto *range = range_records.push ();
-      auto offset = feature_records.length;
-
-      active_features.qsort ();
-      for (unsigned int j = 0; j < active_features.length; j++)
-      {
-        if (!j || active_features[j].fea.tag_le != feature_records[feature_records.length - 1].tag_le)
-        {
-          feature_records.push (active_features[j].fea);
-        }
-        else
-        {
-          /* Overrides value for existing feature. */
-          feature_records[feature_records.length - 1].value = active_features[j].fea.value;
-        }
-      }
-
-      /* Will convert to pointer after all is ready, since feature_records.array
-       * may move as we grow it. */
-      range->features.features = reinterpret_cast<hb_ms_feature_t *> (offset);
-      range->features.num_features = feature_records.length - offset;
-      range->index_first = last_index;
-      range->index_last  = event->index - 1;
-
-      last_index = event->index;
-    }
-
-    if (event->start)
-    {
-      active_features.push (event->feature);
-    }
-    else
-    {
-      auto *feature = active_features.find (&event->feature);
-      if (feature)
-        active_features.remove (feature - active_features.arrayZ);
-    }
-  }
-
-  if (!range_records.length) /* No active feature found. */
-    num_features = 0;
-
-  /* Fixup the pointers. */
-  for (unsigned int i = 0; i < range_records.length; i++)
-  {
-    auto *range = &range_records[i];
-    range->features.features = (hb_ms_feature_t *) feature_records + reinterpret_cast<uintptr_t> (range->features.features);
-  }
-
-  return !!num_features;
-}
-
-void
-hb_ms_make_feature_ranges (hb_vector_t<hb_ms_feature_t>      &feature_records,
-			   hb_vector_t<hb_ms_range_record_t> &range_records,
-			   unsigned int                       chars_offset,
-			   unsigned int                       chars_len,
-			   uint16_t                          *log_clusters,
-			   hb_vector_t<hb_ms_features_t*>    &range_features, /* OUT */
-			   hb_vector_t<uint32_t>             &range_counts /* OUT */)
-{
-  range_features.shrink (0);
-  range_counts.shrink (0);
-
-  auto *last_range = &range_records[0];
-  for (unsigned int i = chars_offset; i < chars_len; i++)
-  {
-    auto *range = last_range;
-    while (log_clusters[i] < range->index_first)
-      range--;
-    while (log_clusters[i] > range->index_last)
-      range++;
-    if (!range_features.length ||
-        &range->features != range_features[range_features.length - 1])
-    {
-      auto **features = range_features.push ();
-      auto *c = range_counts.push ();
-      if (unlikely (!features || !c))
-      {
-        range_features.shrink (0);
-        range_counts.shrink (0);
-        break;
-      }
-      *features = &range->features;
-      *c = 1;
-    }
-    else
-    {
-      range_counts[range_counts.length - 1]++;
-    }
-
-    last_range = range;
-  }
-}
diff --git a/thirdparty/harfbuzz/src/hb-ms-feature-ranges.hh b/thirdparty/harfbuzz/src/hb-ms-feature-ranges.hh
index 401d1e1d97..d40fdeaa82 100644
--- a/thirdparty/harfbuzz/src/hb-ms-feature-ranges.hh
+++ b/thirdparty/harfbuzz/src/hb-ms-feature-ranges.hh
@@ -52,8 +52,8 @@ struct hb_ms_active_feature_t {
 	   a->fea.value < b->fea.value ? -1 : a->fea.value > b->fea.value ? 1 :
 	   0;
   }
-  bool operator== (const hb_ms_active_feature_t *f)
-  { return cmp (this, f) == 0; }
+  bool operator== (const hb_ms_active_feature_t& f) const
+  { return cmp (this, &f) == 0; }
 };
 
 struct hb_ms_feature_event_t {
@@ -77,20 +77,153 @@ struct hb_ms_range_record_t {
   unsigned int index_last;  /* == end - 1 */
 };
 
-HB_INTERNAL bool
+static inline bool
 hb_ms_setup_features (const hb_feature_t                *features,
 		      unsigned int                       num_features,
 		      hb_vector_t<hb_ms_feature_t>      &feature_records, /* OUT */
-		      hb_vector_t<hb_ms_range_record_t> &range_records /* OUT */);
+		      hb_vector_t<hb_ms_range_record_t> &range_records /* OUT */)
+{
+  feature_records.shrink(0);
+  range_records.shrink(0);
 
+  /* Sort features by start/end events. */
+  hb_vector_t<hb_ms_feature_event_t> feature_events;
+  for (unsigned int i = 0; i < num_features; i++)
+  {
+    hb_ms_active_feature_t feature;
+    feature.fea.tag_le = hb_uint32_swap (features[i].tag);
+    feature.fea.value = features[i].value;
+    feature.order = i;
+
+    hb_ms_feature_event_t *event;
+
+    event = feature_events.push ();
+    event->index = features[i].start;
+    event->start = true;
+    event->feature = feature;
+
+    event = feature_events.push ();
+    event->index = features[i].end;
+    event->start = false;
+    event->feature = feature;
+  }
+  feature_events.qsort ();
+  /* Add a strategic final event. */
+  {
+    hb_ms_active_feature_t feature;
+    feature.fea.tag_le = 0;
+    feature.fea.value = 0;
+    feature.order = num_features + 1;
+
+    auto *event = feature_events.push ();
+    event->index = 0; /* This value does magic. */
+    event->start = false;
+    event->feature = feature;
+  }
+
+  /* Scan events and save features for each range. */
+  hb_vector_t<hb_ms_active_feature_t> active_features;
+  unsigned int last_index = 0;
+  for (unsigned int i = 0; i < feature_events.length; i++)
+  {
+    auto *event = &feature_events[i];
+
+    if (event->index != last_index)
+    {
+      /* Save a snapshot of active features and the range. */
+      auto *range = range_records.push ();
+      auto offset = feature_records.length;
+
+      active_features.qsort ();
+      for (unsigned int j = 0; j < active_features.length; j++)
+      {
+        if (!j || active_features[j].fea.tag_le != feature_records[feature_records.length - 1].tag_le)
+        {
+          feature_records.push (active_features[j].fea);
+        }
+        else
+        {
+          /* Overrides value for existing feature. */
+          feature_records[feature_records.length - 1].value = active_features[j].fea.value;
+        }
+      }
+
+      /* Will convert to pointer after all is ready, since feature_records.array
+       * may move as we grow it. */
+      range->features.features = reinterpret_cast<hb_ms_feature_t *> (offset);
+      range->features.num_features = feature_records.length - offset;
+      range->index_first = last_index;
+      range->index_last  = event->index - 1;
 
-HB_INTERNAL void
+      last_index = event->index;
+    }
+
+    if (event->start)
+    {
+      active_features.push (event->feature);
+    }
+    else
+    {
+      auto *feature = active_features.lsearch (event->feature);
+      if (feature)
+        active_features.remove (feature - active_features.arrayZ);
+    }
+  }
+
+  if (!range_records.length) /* No active feature found. */
+    num_features = 0;
+
+  /* Fixup the pointers. */
+  for (unsigned int i = 0; i < range_records.length; i++)
+  {
+    auto *range = &range_records[i];
+    range->features.features = (hb_ms_feature_t *) feature_records + reinterpret_cast<uintptr_t> (range->features.features);
+  }
+
+  return !!num_features;
+}
+
+static inline void
 hb_ms_make_feature_ranges (hb_vector_t<hb_ms_feature_t>      &feature_records,
 			   hb_vector_t<hb_ms_range_record_t> &range_records,
 			   unsigned int                       chars_offset,
 			   unsigned int                       chars_len,
 			   uint16_t                          *log_clusters,
 			   hb_vector_t<hb_ms_features_t*>    &range_features, /* OUT */
-			   hb_vector_t<uint32_t>             &range_counts /* OUT */);
+			   hb_vector_t<uint32_t>             &range_counts /* OUT */)
+{
+  range_features.shrink (0);
+  range_counts.shrink (0);
+
+  auto *last_range = &range_records[0];
+  for (unsigned int i = chars_offset; i < chars_len; i++)
+  {
+    auto *range = last_range;
+    while (log_clusters[i] < range->index_first)
+      range--;
+    while (log_clusters[i] > range->index_last)
+      range++;
+    if (!range_features.length ||
+        &range->features != range_features[range_features.length - 1])
+    {
+      auto **features = range_features.push ();
+      auto *c = range_counts.push ();
+      if (unlikely (!features || !c))
+      {
+        range_features.shrink (0);
+        range_counts.shrink (0);
+        break;
+      }
+      *features = &range->features;
+      *c = 1;
+    }
+    else
+    {
+      range_counts[range_counts.length - 1]++;
+    }
+
+    last_range = range;
+  }
+}
 
 #endif /* HB_MS_FEATURE_RANGES_HH */
diff --git a/thirdparty/harfbuzz/src/hb-object.hh b/thirdparty/harfbuzz/src/hb-object.hh
index 0e15cb12c4..4b5bc32ade 100644
--- a/thirdparty/harfbuzz/src/hb-object.hh
+++ b/thirdparty/harfbuzz/src/hb-object.hh
@@ -53,7 +53,7 @@ struct hb_lockable_set_t
   item_t *replace_or_insert (T v, lock_t &l, bool replace)
   {
     l.lock ();
-    item_t *item = items.find (v);
+    item_t *item = items.lsearch (v);
     if (item) {
       if (replace) {
 	item_t old = *item;
@@ -76,7 +76,7 @@ struct hb_lockable_set_t
   void remove (T v, lock_t &l)
   {
     l.lock ();
-    item_t *item = items.find (v);
+    item_t *item = items.lsearch (v);
     if (item)
     {
       item_t old = *item;
@@ -93,7 +93,7 @@ struct hb_lockable_set_t
   bool find (T v, item_t *i, lock_t &l)
   {
     l.lock ();
-    item_t *item = items.find (v);
+    item_t *item = items.lsearch (v);
     if (item)
       *i = *item;
     l.unlock ();
diff --git a/thirdparty/harfbuzz/src/hb-ot-cff-common.hh b/thirdparty/harfbuzz/src/hb-ot-cff-common.hh
index 180c87cb89..c102c15173 100644
--- a/thirdparty/harfbuzz/src/hb-ot-cff-common.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-cff-common.hh
@@ -68,8 +68,6 @@ struct code_pair_t
 typedef hb_vector_t<unsigned char> str_buff_t;
 struct str_buff_vec_t : hb_vector_t<str_buff_t>
 {
-  void fini () { SUPER::fini_deep (); }
-
   unsigned int total_size () const
   {
     unsigned int size = 0;
diff --git a/thirdparty/harfbuzz/src/hb-ot-cff1-table.hh b/thirdparty/harfbuzz/src/hb-ot-cff1-table.hh
index 5dd183e3a0..6fb59315c9 100644
--- a/thirdparty/harfbuzz/src/hb-ot-cff1-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-cff1-table.hh
@@ -1144,8 +1144,8 @@ struct cff1
     {
       sc.end_processing ();
       topDict.fini ();
-      fontDicts.fini_deep ();
-      privateDicts.fini_deep ();
+      fontDicts.fini ();
+      privateDicts.fini ();
       hb_blob_destroy (blob);
       blob = nullptr;
     }
@@ -1245,32 +1245,32 @@ struct cff1
     }
 
     protected:
-    hb_blob_t	           *blob;
+    hb_blob_t	           *blob = nullptr;
     hb_sanitize_context_t   sc;
 
     public:
-    const Encoding	    *encoding;
-    const Charset	    *charset;
-    const CFF1NameIndex     *nameIndex;
-    const CFF1TopDictIndex  *topDictIndex;
-    const CFF1StringIndex   *stringIndex;
-    const CFF1Subrs	    *globalSubrs;
-    const CFF1CharStrings   *charStrings;
-    const CFF1FDArray       *fdArray;
-    const CFF1FDSelect      *fdSelect;
-    unsigned int	     fdCount;
+    const Encoding	    *encoding = nullptr;
+    const Charset	    *charset = nullptr;
+    const CFF1NameIndex     *nameIndex = nullptr;
+    const CFF1TopDictIndex  *topDictIndex = nullptr;
+    const CFF1StringIndex   *stringIndex = nullptr;
+    const CFF1Subrs	    *globalSubrs = nullptr;
+    const CFF1CharStrings   *charStrings = nullptr;
+    const CFF1FDArray       *fdArray = nullptr;
+    const CFF1FDSelect      *fdSelect = nullptr;
+    unsigned int	     fdCount = 0;
 
     cff1_top_dict_values_t   topDict;
     hb_vector_t<cff1_font_dict_values_t>
 			     fontDicts;
     hb_vector_t<PRIVDICTVAL> privateDicts;
 
-    unsigned int	     num_glyphs;
+    unsigned int	     num_glyphs = 0;
   };
 
   struct accelerator_t : accelerator_templ_t<cff1_private_dict_opset_t, cff1_private_dict_values_t>
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     {
       SUPER::init (face);
 
@@ -1295,8 +1295,7 @@ struct cff1
       }
       glyph_names.qsort ();
     }
-
-    void fini ()
+    ~accelerator_t ()
     {
       glyph_names.fini ();
 
@@ -1398,7 +1397,10 @@ struct cff1
   DEFINE_SIZE_STATIC (4);
 };
 
-struct cff1_accelerator_t : cff1::accelerator_t {};
+struct cff1_accelerator_t : cff1::accelerator_t {
+  cff1_accelerator_t (hb_face_t *face) : cff1::accelerator_t (face) {}
+};
+
 } /* namespace OT */
 
 #endif /* HB_OT_CFF1_TABLE_HH */
diff --git a/thirdparty/harfbuzz/src/hb-ot-cff2-table.hh b/thirdparty/harfbuzz/src/hb-ot-cff2-table.hh
index 829217feaa..6e1b01c8fe 100644
--- a/thirdparty/harfbuzz/src/hb-ot-cff2-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-cff2-table.hh
@@ -397,7 +397,7 @@ struct cff2
   template <typename PRIVOPSET, typename PRIVDICTVAL>
   struct accelerator_templ_t
   {
-    void init (hb_face_t *face)
+    accelerator_templ_t (hb_face_t *face)
     {
       topDict.init ();
       fontDicts.init ();
@@ -412,15 +412,15 @@ struct cff2
       const OT::cff2 *cff2 = this->blob->template as<OT::cff2> ();
 
       if (cff2 == &Null (OT::cff2))
-      { fini (); return; }
+        goto fail;
 
       { /* parse top dict */
 	byte_str_t topDictStr (cff2 + cff2->topDict, cff2->topDictSize);
-	if (unlikely (!topDictStr.sanitize (&sc))) { fini (); return; }
+	if (unlikely (!topDictStr.sanitize (&sc))) goto fail;
 	cff2_top_dict_interpreter_t top_interp;
 	top_interp.env.init (topDictStr);
 	topDict.init ();
-	if (unlikely (!top_interp.interpret (topDict))) { fini (); return; }
+	if (unlikely (!top_interp.interpret (topDict))) goto fail;
       }
 
       globalSubrs = &StructAtOffset<CFF2Subrs> (cff2, cff2->topDict + cff2->topDictSize);
@@ -434,49 +434,55 @@ struct cff2
 	  (globalSubrs == &Null (CFF2Subrs)) || unlikely (!globalSubrs->sanitize (&sc)) ||
 	  (fdArray == &Null (CFF2FDArray)) || unlikely (!fdArray->sanitize (&sc)) ||
 	  (((fdSelect != &Null (CFF2FDSelect)) && unlikely (!fdSelect->sanitize (&sc, fdArray->count)))))
-      { fini (); return; }
+        goto fail;
 
       num_glyphs = charStrings->count;
       if (num_glyphs != sc.get_num_glyphs ())
-      { fini (); return; }
+        goto fail;
 
       fdCount = fdArray->count;
       if (!privateDicts.resize (fdCount))
-      { fini (); return; }
+        goto fail;
 
       /* parse font dicts and gather private dicts */
       for (unsigned int i = 0; i < fdCount; i++)
       {
 	const byte_str_t fontDictStr = (*fdArray)[i];
-	if (unlikely (!fontDictStr.sanitize (&sc))) { fini (); return; }
+	if (unlikely (!fontDictStr.sanitize (&sc))) goto fail;
 	cff2_font_dict_values_t  *font;
 	cff2_font_dict_interpreter_t font_interp;
 	font_interp.env.init (fontDictStr);
 	font = fontDicts.push ();
-	if (unlikely (font == &Crap (cff2_font_dict_values_t))) { fini (); return; }
+	if (unlikely (font == &Crap (cff2_font_dict_values_t))) goto fail;
 	font->init ();
-	if (unlikely (!font_interp.interpret (*font))) { fini (); return; }
+	if (unlikely (!font_interp.interpret (*font))) goto fail;
 
 	const byte_str_t privDictStr (StructAtOffsetOrNull<UnsizedByteStr> (cff2, font->privateDictInfo.offset), font->privateDictInfo.size);
-	if (unlikely (!privDictStr.sanitize (&sc))) { fini (); return; }
+	if (unlikely (!privDictStr.sanitize (&sc))) goto fail;
 	dict_interpreter_t<PRIVOPSET, PRIVDICTVAL, cff2_priv_dict_interp_env_t>  priv_interp;
 	priv_interp.env.init(privDictStr);
 	privateDicts[i].init ();
-	if (unlikely (!priv_interp.interpret (privateDicts[i]))) { fini (); return; }
+	if (unlikely (!priv_interp.interpret (privateDicts[i]))) goto fail;
 
 	privateDicts[i].localSubrs = &StructAtOffsetOrNull<CFF2Subrs> (&privDictStr[0], privateDicts[i].subrsOffset);
 	if (privateDicts[i].localSubrs != &Null (CFF2Subrs) &&
 	  unlikely (!privateDicts[i].localSubrs->sanitize (&sc)))
-	{ fini (); return; }
+	  goto fail;
       }
-    }
 
-    void fini ()
+
+      return;
+
+      fail:
+        _fini ();
+    }
+    ~accelerator_templ_t () { _fini (); }
+    void _fini ()
     {
       sc.end_processing ();
       topDict.fini ();
-      fontDicts.fini_deep ();
-      privateDicts.fini_deep ();
+      fontDicts.fini ();
+      privateDicts.fini ();
       hb_blob_destroy (blob);
       blob = nullptr;
     }
@@ -484,26 +490,28 @@ struct cff2
     bool is_valid () const { return blob; }
 
     protected:
-    hb_blob_t			*blob;
+    hb_blob_t			*blob = nullptr;
     hb_sanitize_context_t	sc;
 
     public:
     cff2_top_dict_values_t	topDict;
-    const CFF2Subrs		*globalSubrs;
-    const CFF2VariationStore	*varStore;
-    const CFF2CharStrings	*charStrings;
-    const CFF2FDArray		*fdArray;
-    const CFF2FDSelect		*fdSelect;
-    unsigned int		fdCount;
+    const CFF2Subrs		*globalSubrs = nullptr;
+    const CFF2VariationStore	*varStore = nullptr;
+    const CFF2CharStrings	*charStrings = nullptr;
+    const CFF2FDArray		*fdArray = nullptr;
+    const CFF2FDSelect		*fdSelect = nullptr;
+    unsigned int		fdCount = 0;
 
     hb_vector_t<cff2_font_dict_values_t>     fontDicts;
     hb_vector_t<PRIVDICTVAL>  privateDicts;
 
-    unsigned int	      num_glyphs;
+    unsigned int	      num_glyphs = 0;
   };
 
   struct accelerator_t : accelerator_templ_t<cff2_private_dict_opset_t, cff2_private_dict_values_t>
   {
+    accelerator_t (hb_face_t *face) : accelerator_templ_t (face) {}
+
     HB_INTERNAL bool get_extents (hb_font_t *font,
 				  hb_codepoint_t glyph,
 				  hb_glyph_extents_t *extents) const;
@@ -525,7 +533,10 @@ struct cff2
   DEFINE_SIZE_STATIC (5);
 };
 
-struct cff2_accelerator_t : cff2::accelerator_t {};
+struct cff2_accelerator_t : cff2::accelerator_t {
+  cff2_accelerator_t (hb_face_t *face) : cff2::accelerator_t (face) {}
+};
+
 } /* namespace OT */
 
 #endif /* HB_OT_CFF2_TABLE_HH */
diff --git a/thirdparty/harfbuzz/src/hb-ot-cmap-table.hh b/thirdparty/harfbuzz/src/hb-ot-cmap-table.hh
index d837adc788..fde57cdc5b 100644
--- a/thirdparty/harfbuzz/src/hb-ot-cmap-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-cmap-table.hh
@@ -369,7 +369,6 @@ struct CmapSubtableFormat4
   {
     accelerator_t () {}
     accelerator_t (const CmapSubtableFormat4 *subtable) { init (subtable); }
-    ~accelerator_t () { fini (); }
 
     void init (const CmapSubtableFormat4 *subtable)
     {
@@ -381,7 +380,6 @@ struct CmapSubtableFormat4
       glyphIdArray = idRangeOffset + segCount;
       glyphIdArrayLength = (subtable->length - 16 - 8 * segCount) / 2;
     }
-    void fini () {}
 
     bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
     {
@@ -1607,7 +1605,7 @@ struct cmap
       unsigned format = (this + _.subtable).u.format;
       if (format == 12) has_format12 = true;
 
-      const EncodingRecord *table = hb_addressof (_);
+      const EncodingRecord *table = std::addressof (_);
       if      (_.platformID == 0 && _.encodingID ==  3) unicode_bmp = table;
       else if (_.platformID == 0 && _.encodingID ==  4) unicode_ucs4 = table;
       else if (_.platformID == 3 && _.encodingID ==  1) ms_bmp = table;
@@ -1665,7 +1663,7 @@ struct cmap
 
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     {
       this->table = hb_sanitize_context_t ().reference_table<cmap> (face);
       bool symbol;
@@ -1700,8 +1698,7 @@ struct cmap
 	}
       }
     }
-
-    void fini () { this->table.destroy (); }
+    ~accelerator_t () { this->table.destroy (); }
 
     bool get_nominal_glyph (hb_codepoint_t  unicode,
 			    hb_codepoint_t *glyph) const
@@ -1863,7 +1860,9 @@ struct cmap
   DEFINE_SIZE_ARRAY (4, encodingRecord);
 };
 
-struct cmap_accelerator_t : cmap::accelerator_t {};
+struct cmap_accelerator_t : cmap::accelerator_t {
+  cmap_accelerator_t (hb_face_t *face) : cmap::accelerator_t (face) {}
+};
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-color-cbdt-table.hh b/thirdparty/harfbuzz/src/hb-ot-color-cbdt-table.hh
index 14459914ee..23fa56c4f6 100644
--- a/thirdparty/harfbuzz/src/hb-ot-color-cbdt-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-color-cbdt-table.hh
@@ -360,6 +360,16 @@ struct IndexSubtable
 
 struct IndexSubtableRecord
 {
+  /* XXX Remove this and fix by not inserting it into vector. */
+  IndexSubtableRecord& operator = (const IndexSubtableRecord &o)
+  {
+    firstGlyphIndex = o.firstGlyphIndex;
+    lastGlyphIndex = o.lastGlyphIndex;
+    offsetToSubtable = (unsigned) o.offsetToSubtable;
+    assert (offsetToSubtable.is_null ());
+    return *this;
+  }
+
   bool sanitize (hb_sanitize_context_t *c, const void *base) const
   {
     TRACE_SANITIZE (this);
@@ -809,15 +819,14 @@ struct CBDT
 
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     {
-      cblc = hb_sanitize_context_t ().reference_table<CBLC> (face);
-      cbdt = hb_sanitize_context_t ().reference_table<CBDT> (face);
+      this->cblc = hb_sanitize_context_t ().reference_table<CBLC> (face);
+      this->cbdt = hb_sanitize_context_t ().reference_table<CBDT> (face);
 
       upem = hb_face_get_upem (face);
     }
-
-    void fini ()
+    ~accelerator_t ()
     {
       this->cblc.destroy ();
       this->cbdt.destroy ();
@@ -978,7 +987,10 @@ CBLC::subset (hb_subset_context_t *c) const
   return_trace (CBLC::sink_cbdt (c, &cbdt_prime));
 }
 
-struct CBDT_accelerator_t : CBDT::accelerator_t {};
+struct CBDT_accelerator_t : CBDT::accelerator_t {
+  CBDT_accelerator_t (hb_face_t *face) : CBDT::accelerator_t (face) {}
+};
+
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-color-colr-table.hh b/thirdparty/harfbuzz/src/hb-ot-color-colr-table.hh
index 008422d089..dac755c02c 100644
--- a/thirdparty/harfbuzz/src/hb-ot-color-colr-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-color-colr-table.hh
@@ -71,7 +71,7 @@ struct hb_colrv1_closure_context_t :
   bool paint_visited (const void *paint)
   {
     hb_codepoint_t delta = (hb_codepoint_t) ((uintptr_t) paint - (uintptr_t) base);
-     if (visited_paint.has (delta))
+    if (visited_paint.in_error() || visited_paint.has (delta))
       return true;
 
     visited_paint.add (delta);
@@ -1270,13 +1270,9 @@ struct COLR
 
   struct accelerator_t
   {
-    accelerator_t () {}
-    ~accelerator_t () { fini (); }
-
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     { colr = hb_sanitize_context_t ().reference_table<COLR> (face); }
-
-    void fini () { this->colr.destroy (); }
+    ~accelerator_t () { this->colr.destroy (); }
 
     bool is_valid () { return colr.get_blob ()->length; }
 
@@ -1535,6 +1531,10 @@ struct COLR
   DEFINE_SIZE_MIN (14);
 };
 
+struct COLR_accelerator_t : COLR::accelerator_t {
+  COLR_accelerator_t (hb_face_t *face) : COLR::accelerator_t (face) {}
+};
+
 } /* namespace OT */
 
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-color-colrv1-closure.hh b/thirdparty/harfbuzz/src/hb-ot-color-colrv1-closure.hh
index ca85ba6ad6..fbaf2ec26b 100644
--- a/thirdparty/harfbuzz/src/hb-ot-color-colrv1-closure.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-color-colrv1-closure.hh
@@ -43,7 +43,7 @@ HB_INTERNAL void PaintColrLayers::closurev1 (hb_colrv1_closure_context_t* c) con
   const LayerList &paint_offset_lists = c->get_colr_table ()->get_layerList ();
   for (unsigned i = firstLayerIndex; i < firstLayerIndex + numLayers; i++)
   {
-    const Paint &paint = hb_addressof (paint_offset_lists) + paint_offset_lists[i];
+    const Paint &paint = std::addressof (paint_offset_lists) + paint_offset_lists[i];
     paint.dispatch (c);
   }
 }
diff --git a/thirdparty/harfbuzz/src/hb-ot-color-sbix-table.hh b/thirdparty/harfbuzz/src/hb-ot-color-sbix-table.hh
index d2911f19e6..9741ebd450 100644
--- a/thirdparty/harfbuzz/src/hb-ot-color-sbix-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-color-sbix-table.hh
@@ -202,12 +202,12 @@ struct sbix
 
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     {
       table = hb_sanitize_context_t ().reference_table<sbix> (face);
       num_glyphs = face->get_num_glyphs ();
     }
-    void fini () { table.destroy (); }
+    ~accelerator_t () { table.destroy (); }
 
     bool has_data () const { return table->has_data (); }
 
@@ -407,7 +407,10 @@ struct sbix
   DEFINE_SIZE_ARRAY (8, strikes);
 };
 
-struct sbix_accelerator_t : sbix::accelerator_t {};
+struct sbix_accelerator_t : sbix::accelerator_t {
+  sbix_accelerator_t (hb_face_t *face) : sbix::accelerator_t (face) {}
+};
+
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-color-svg-table.hh b/thirdparty/harfbuzz/src/hb-ot-color-svg-table.hh
index e022ef43b7..fc649f1006 100644
--- a/thirdparty/harfbuzz/src/hb-ot-color-svg-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-color-svg-table.hh
@@ -79,9 +79,9 @@ struct SVG
 
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     { table = hb_sanitize_context_t ().reference_table<SVG> (face); }
-    void fini () { table.destroy (); }
+    ~accelerator_t () { table.destroy (); }
 
     hb_blob_t *reference_blob_for_glyph (hb_codepoint_t glyph_id) const
     {
@@ -116,7 +116,9 @@ struct SVG
   DEFINE_SIZE_STATIC (10);
 };
 
-struct SVG_accelerator_t : SVG::accelerator_t {};
+struct SVG_accelerator_t : SVG::accelerator_t {
+  SVG_accelerator_t (hb_face_t *face) : SVG::accelerator_t (face) {}
+};
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-color.cc b/thirdparty/harfbuzz/src/hb-ot-color.cc
index 4170b71317..16077765bd 100644
--- a/thirdparty/harfbuzz/src/hb-ot-color.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-color.cc
@@ -90,15 +90,15 @@ hb_ot_color_palette_get_count (hb_face_t *face)
 /**
  * hb_ot_color_palette_get_name_id:
  * @face: #hb_face_t to work upon
- * @palette_index: The index of the color palette 
+ * @palette_index: The index of the color palette
  *
  * Fetches the `name` table Name ID that provides display names for
- * a `CPAL` color palette. 
+ * a `CPAL` color palette.
  *
  * Palette display names can be generic (e.g., "Default") or provide
  * specific, themed names (e.g., "Spring", "Summer", "Fall", and "Winter").
  *
- * Return value: the Named ID found for the palette. 
+ * Return value: the Named ID found for the palette.
  * If the requested palette has no name the result is #HB_OT_NAME_ID_INVALID.
  *
  * Since: 2.1.0
@@ -116,7 +116,7 @@ hb_ot_color_palette_get_name_id (hb_face_t *face,
  * @color_index: The index of the color
  *
  * Fetches the `name` table Name ID that provides display names for
- * the specificed color in a face's `CPAL` color palette. 
+ * the specified color in a face's `CPAL` color palette.
  *
  * Display names can be generic (e.g., "Background") or specific
  * (e.g., "Eye color").
@@ -256,6 +256,8 @@ hb_ot_color_has_svg (hb_face_t *face)
  *
  * Fetches the SVG document for a glyph. The blob may be either plain text or gzip-encoded.
  *
+ * If the glyph has no SVG document, the singleton empty blob is returned.
+ *
  * Return value: (transfer full): An #hb_blob_t containing the SVG document of the glyph, if available
  *
  * Since: 2.1.0
@@ -296,6 +298,8 @@ hb_ot_color_has_png (hb_face_t *face)
  * as input. To get an optimally sized PNG blob, the UPEM value must be set on the @font
  * object. If UPEM is unset, the blob returned will be the largest PNG available.
  *
+ * If the glyph has no PNG image, the singleton empty blob is returned.
+ *
  * Return value: (transfer full): An #hb_blob_t containing the PNG image for the glyph, if available
  *
  * Since: 2.1.0
diff --git a/thirdparty/harfbuzz/src/hb-ot-glyf-table.hh b/thirdparty/harfbuzz/src/hb-ot-glyf-table.hh
index 6aa34295c7..9bac30fff3 100644
--- a/thirdparty/harfbuzz/src/hb-ot-glyf-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-glyf-table.hh
@@ -207,8 +207,7 @@ struct glyf
   _populate_subset_glyphs (const hb_subset_plan_t   *plan,
 			   hb_vector_t<SubsetGlyph> *glyphs /* OUT */) const
   {
-    OT::glyf::accelerator_t glyf;
-    glyf.init (plan->source);
+    OT::glyf::accelerator_t glyf (plan->source);
 
     + hb_range (plan->num_output_glyphs ())
     | hb_map ([&] (hb_codepoint_t new_gid)
@@ -233,8 +232,6 @@ struct glyf
 	      })
     | hb_sink (glyphs)
     ;
-
-    glyf.fini ();
   }
 
   static bool
@@ -595,7 +592,7 @@ struct glyf
         if (unlikely (!header.numberOfContours)) return;
 
         unsigned flags_offset = length (instructions_length ());
-        if (unlikely (length (flags_offset + 1) > bytes.length)) return;
+        if (unlikely (flags_offset + 1 > bytes.length)) return;
 
 	HBUINT8 &first_flag = (HBUINT8 &) StructAtOffset<HBUINT16> (&bytes, flags_offset);
         first_flag = (uint8_t) first_flag | FLAG_OVERLAP_SIMPLE;
@@ -920,7 +917,7 @@ struct glyf
 
   struct accelerator_t
   {
-    void init (hb_face_t *face_)
+    accelerator_t (hb_face_t *face_)
     {
       short_offset = false;
       num_glyphs = 0;
@@ -953,8 +950,7 @@ struct glyf
       num_glyphs = hb_max (1u, loca_table.get_length () / (short_offset ? 2 : 4)) - 1;
       num_glyphs = hb_min (num_glyphs, face->get_num_glyphs ());
     }
-
-    void fini ()
+    ~accelerator_t ()
     {
       loca_table.destroy ();
       glyf_table.destroy ();
@@ -1358,7 +1354,10 @@ struct glyf
 			 * defining it _MIN instead. */
 };
 
-struct glyf_accelerator_t : glyf::accelerator_t {};
+struct glyf_accelerator_t : glyf::accelerator_t {
+  glyf_accelerator_t (hb_face_t *face) : glyf::accelerator_t (face) {}
+};
+
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-hmtx-table.hh b/thirdparty/harfbuzz/src/hb-ot-hmtx-table.hh
index 7d2d2d3eb8..36bffa70a5 100644
--- a/thirdparty/harfbuzz/src/hb-ot-hmtx-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-hmtx-table.hh
@@ -127,8 +127,7 @@ struct hmtxvmtx
     T *table_prime = c->serializer->start_embed <T> ();
     if (unlikely (!table_prime)) return_trace (false);
 
-    accelerator_t _mtx;
-    _mtx.init (c->plan->source);
+    accelerator_t _mtx (c->plan->source);
     unsigned num_advances = _mtx.num_advances_for_subset (c->plan);
 
     auto it =
@@ -144,8 +143,6 @@ struct hmtxvmtx
 
     table_prime->serialize (c->serializer, it, num_advances);
 
-    _mtx.fini ();
-
     if (unlikely (c->serializer->in_error ()))
       return_trace (false);
 
@@ -160,8 +157,8 @@ struct hmtxvmtx
   {
     friend struct hmtxvmtx;
 
-    void init (hb_face_t *face,
-	       unsigned int default_advance_ = 0)
+    accelerator_t (hb_face_t *face,
+		   unsigned int default_advance_ = 0)
     {
       default_advance = default_advance_ ? default_advance_ : hb_face_get_upem (face);
 
@@ -193,8 +190,7 @@ struct hmtxvmtx
 
       var_table = hb_sanitize_context_t ().reference_table<HVARVVAR> (face, T::variationsTag);
     }
-
-    void fini ()
+    ~accelerator_t ()
     {
       table.destroy ();
       var_table.destroy ();
@@ -338,8 +334,12 @@ struct vmtx : hmtxvmtx<vmtx, vhea> {
   static constexpr bool is_horizontal = false;
 };
 
-struct hmtx_accelerator_t : hmtx::accelerator_t {};
-struct vmtx_accelerator_t : vmtx::accelerator_t {};
+struct hmtx_accelerator_t : hmtx::accelerator_t {
+  hmtx_accelerator_t (hb_face_t *face) : hmtx::accelerator_t (face) {}
+};
+struct vmtx_accelerator_t : vmtx::accelerator_t {
+  vmtx_accelerator_t (hb_face_t *face) : vmtx::accelerator_t (face) {}
+};
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout-common.hh b/thirdparty/harfbuzz/src/hb-ot-layout-common.hh
index 4fb1893435..60a1906155 100644
--- a/thirdparty/harfbuzz/src/hb-ot-layout-common.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-layout-common.hh
@@ -128,7 +128,7 @@ struct hb_prune_langsys_context_t
   bool visited (const T *p, hb_set_t &visited_set)
   {
     hb_codepoint_t delta = (hb_codepoint_t) ((uintptr_t) p - (uintptr_t) table);
-     if (visited_set.has (delta))
+    if (visited_set.in_error () || visited_set.has (delta))
       return true;
 
     visited_set.add (delta);
@@ -655,7 +655,6 @@ struct LangSys
   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 ());
@@ -750,11 +749,15 @@ struct Script
     {
       //only collect features from non-redundant langsys
       const LangSys& d = get_default_lang_sys ();
-      d.collect_features (c);
+      if (!c->visitedLangsys (&d)) {
+        d.collect_features (c);
+      }
 
       for (auto _ : + hb_zip (langSys, hb_range (langsys_count)))
       {
+
         const LangSys& l = this+_.first.offset;
+        if (c->visitedLangsys (&l)) continue;
         if (l.compare (d, c->duplicate_feature_map)) continue;
 
         l.collect_features (c);
@@ -766,6 +769,7 @@ struct Script
       for (auto _ : + hb_zip (langSys, hb_range (langsys_count)))
       {
         const LangSys& l = this+_.first.offset;
+        if (c->visitedLangsys (&l)) continue;
         l.collect_features (c);
         c->script_langsys_map->get (script_index)->add (_.second);
       }
@@ -845,7 +849,7 @@ struct FeatureParamsSize
     if (unlikely (!c->check_struct (this))) return_trace (false);
 
     /* This subtable has some "history", if you will.  Some earlier versions of
-     * Adobe tools calculated the offset of the FeatureParams sutable from the
+     * Adobe tools calculated the offset of the FeatureParams subtable from the
      * beginning of the FeatureList table!  Now, that is dealt with in the
      * Feature implementation.  But we still need to be able to tell junk from
      * real data.  Note: We don't check that the nameID actually exists.
@@ -2926,8 +2930,6 @@ struct VariationStore
 
     hb_vector_t<hb_inc_bimap_t> inner_maps;
     inner_maps.resize ((unsigned) dataSets.len);
-    for (unsigned i = 0; i < inner_maps.length; i++)
-      inner_maps[i].init ();
 
     for (unsigned idx : c->plan->layout_variation_indices->iter ())
     {
@@ -2935,18 +2937,11 @@ struct VariationStore
       uint16_t minor = idx & 0xFFFF;
 
       if (major >= inner_maps.length)
-      {
-	for (unsigned i = 0; i < inner_maps.length; i++)
-	  inner_maps[i].fini ();
 	return_trace (false);
-      }
       inner_maps[major].add (minor);
     }
     varstore_prime->serialize (c->serializer, this, inner_maps.as_array ());
 
-    for (unsigned i = 0; i < inner_maps.length; i++)
-      inner_maps[i].fini ();
-
     return_trace (
         !c->serializer->in_error()
         && varstore_prime->dataSets);
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout-gdef-table.hh b/thirdparty/harfbuzz/src/hb-ot-layout-gdef-table.hh
index aea644f3e1..a76d644c4b 100644
--- a/thirdparty/harfbuzz/src/hb-ot-layout-gdef-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-layout-gdef-table.hh
@@ -585,17 +585,16 @@ struct GDEF
 
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     {
-      this->table = hb_sanitize_context_t ().reference_table<GDEF> (face);
-      if (unlikely (this->table->is_blocklisted (this->table.get_blob (), face)))
+      table = hb_sanitize_context_t ().reference_table<GDEF> (face);
+      if (unlikely (table->is_blocklisted (table.get_blob (), face)))
       {
-	hb_blob_destroy (this->table.get_blob ());
-	this->table = hb_blob_get_empty ();
+	hb_blob_destroy (table.get_blob ());
+	table = hb_blob_get_empty ();
       }
     }
-
-    void fini () { this->table.destroy (); }
+    ~accelerator_t () { table.destroy (); }
 
     hb_blob_ptr_t<GDEF> table;
   };
@@ -715,7 +714,9 @@ struct GDEF
   DEFINE_SIZE_MIN (12);
 };
 
-struct GDEF_accelerator_t : GDEF::accelerator_t {};
+struct GDEF_accelerator_t : GDEF::accelerator_t {
+  GDEF_accelerator_t (hb_face_t *face) : GDEF::accelerator_t (face) {}
+};
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout-gpos-table.hh b/thirdparty/harfbuzz/src/hb-ot-layout-gpos-table.hh
index 6db3e08940..e28c951f3f 100644
--- a/thirdparty/harfbuzz/src/hb-ot-layout-gpos-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-layout-gpos-table.hh
@@ -706,7 +706,7 @@ struct MarkArray : Array16Of<MarkRecord>	/* Array of MarkRecords--in Coverage or
 
     float mark_x, mark_y, base_x, base_y;
 
-    buffer->unsafe_to_break (glyph_pos, buffer->idx);
+    buffer->unsafe_to_break (glyph_pos, buffer->idx + 1);
     mark_anchor.get_anchor (c, buffer->cur().codepoint, &mark_x, &mark_y);
     glyph_anchor.get_anchor (c, buffer->info[glyph_pos].codepoint, &base_x, &base_y);
 
@@ -1235,6 +1235,7 @@ struct PairSet
       buffer->idx = pos;
       return_trace (true);
     }
+    buffer->unsafe_to_concat (buffer->idx, pos + 1);
     return_trace (false);
   }
 
@@ -1362,7 +1363,12 @@ struct PairPosFormat1
 
     hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
     skippy_iter.reset (buffer->idx, 1);
-    if (!skippy_iter.next ()) return_trace (false);
+    unsigned unsafe_to;
+    if (!skippy_iter.next (&unsafe_to))
+    {
+      buffer->unsafe_to_concat (buffer->idx, unsafe_to);
+      return_trace (false);
+    }
 
     return_trace ((this+pairSet[index]).apply (c, valueFormat, skippy_iter.idx));
   }
@@ -1555,7 +1561,12 @@ struct PairPosFormat2
 
     hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
     skippy_iter.reset (buffer->idx, 1);
-    if (!skippy_iter.next ()) return_trace (false);
+    unsigned unsafe_to;
+    if (!skippy_iter.next (&unsafe_to))
+    {
+      buffer->unsafe_to_concat (buffer->idx, unsafe_to);
+      return_trace (false);
+    }
 
     unsigned int len1 = valueFormat1.get_len ();
     unsigned int len2 = valueFormat2.get_len ();
@@ -1563,13 +1574,81 @@ struct PairPosFormat2
 
     unsigned int klass1 = (this+classDef1).get_class (buffer->cur().codepoint);
     unsigned int klass2 = (this+classDef2).get_class (buffer->info[skippy_iter.idx].codepoint);
-    if (unlikely (klass1 >= class1Count || klass2 >= class2Count)) return_trace (false);
+    if (unlikely (klass1 >= class1Count || klass2 >= class2Count))
+    {
+      buffer->unsafe_to_concat (buffer->idx, skippy_iter.idx + 1);
+      return_trace (false);
+    }
 
     const Value *v = &values[record_len * (klass1 * class2Count + klass2)];
-    bool applied_first = valueFormat1.apply_value (c, this, v, buffer->cur_pos());
-    bool applied_second = valueFormat2.apply_value (c, this, v + len1, buffer->pos[skippy_iter.idx]);
+
+    bool applied_first = false, applied_second = false;
+
+
+    /* Isolate simple kerning and apply it half to each side.
+     * Results in better cursor positinoing / underline drawing. */
+    {
+      if (!len2)
+      {
+	const hb_direction_t dir = buffer->props.direction;
+	const bool horizontal = HB_DIRECTION_IS_HORIZONTAL (dir);
+	const bool backward = HB_DIRECTION_IS_BACKWARD (dir);
+	unsigned mask = horizontal ? ValueFormat::xAdvance : ValueFormat::yAdvance;
+	if (backward)
+	  mask |= mask >> 2; /* Add eg. xPlacement in RTL. */
+	/* Add Devices. */
+	mask |= mask << 4;
+
+	if (valueFormat1 & ~mask)
+	  goto bail;
+
+	/* Is simple kern. Apply value on an empty position slot,
+	 * then split it between sides. */
+
+	hb_glyph_position_t pos{};
+	if (valueFormat1.apply_value (c, this, v, pos))
+	{
+	  hb_position_t *src  = &pos.x_advance;
+	  hb_position_t *dst1 = &buffer->cur_pos().x_advance;
+	  hb_position_t *dst2 = &buffer->pos[skippy_iter.idx].x_advance;
+	  unsigned i = horizontal ? 0 : 1;
+
+	  hb_position_t kern  = src[i];
+	  hb_position_t kern1 = kern >> 1;
+	  hb_position_t kern2 = kern - kern1;
+
+	  if (!backward)
+	  {
+	    dst1[i] += kern1;
+	    dst2[i] += kern2;
+	    dst2[i + 2] += kern2;
+	  }
+	  else
+	  {
+	    dst1[i] += kern1;
+	    dst1[i + 2] += src[i + 2] - kern2;
+	    dst2[i] += kern2;
+	  }
+
+	  applied_first = applied_second = kern != 0;
+	  goto success;
+	}
+	goto boring;
+      }
+    }
+    bail:
+
+
+    applied_first = valueFormat1.apply_value (c, this, v, buffer->cur_pos());
+    applied_second = valueFormat2.apply_value (c, this, v + len1, buffer->pos[skippy_iter.idx]);
+
+    success:
     if (applied_first || applied_second)
       buffer->unsafe_to_break (buffer->idx, skippy_iter.idx + 1);
+    else
+    boring:
+      buffer->unsafe_to_concat (buffer->idx, skippy_iter.idx + 1);
+
 
     buffer->idx = skippy_iter.idx;
     if (len2)
@@ -1799,10 +1878,19 @@ struct CursivePosFormat1
 
     hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
     skippy_iter.reset (buffer->idx, 1);
-    if (!skippy_iter.prev ()) return_trace (false);
+    unsigned unsafe_from;
+    if (!skippy_iter.prev (&unsafe_from))
+    {
+      buffer->unsafe_to_concat_from_outbuffer (unsafe_from, buffer->idx + 1);
+      return_trace (false);
+    }
 
     const EntryExitRecord &prev_record = entryExitRecord[(this+coverage).get_coverage  (buffer->info[skippy_iter.idx].codepoint)];
-    if (!prev_record.exitAnchor) return_trace (false);
+    if (!prev_record.exitAnchor)
+    {
+      buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
+      return_trace (false);
+    }
 
     unsigned int i = skippy_iter.idx;
     unsigned int j = buffer->idx;
@@ -2066,7 +2154,13 @@ struct MarkBasePosFormat1
     skippy_iter.reset (buffer->idx, 1);
     skippy_iter.set_lookup_props (LookupFlag::IgnoreMarks);
     do {
-      if (!skippy_iter.prev ()) return_trace (false);
+      unsigned unsafe_from;
+      if (!skippy_iter.prev (&unsafe_from))
+      {
+	buffer->unsafe_to_concat_from_outbuffer (unsafe_from, buffer->idx + 1);
+	return_trace (false);
+      }
+
       /* We only want to attach to the first of a MultipleSubst sequence.
        * https://github.com/harfbuzz/harfbuzz/issues/740
        * Reject others...
@@ -2089,7 +2183,11 @@ struct MarkBasePosFormat1
     //if (!_hb_glyph_info_is_base_glyph (&buffer->info[skippy_iter.idx])) { return_trace (false); }
 
     unsigned int base_index = (this+baseCoverage).get_coverage  (buffer->info[skippy_iter.idx].codepoint);
-    if (base_index == NOT_COVERED) return_trace (false);
+    if (base_index == NOT_COVERED)
+    {
+      buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
+      return_trace (false);
+    }
 
     return_trace ((this+markArray).apply (c, mark_index, base_index, this+baseArray, classCount, skippy_iter.idx));
   }
@@ -2320,21 +2418,34 @@ struct MarkLigPosFormat1
     hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
     skippy_iter.reset (buffer->idx, 1);
     skippy_iter.set_lookup_props (LookupFlag::IgnoreMarks);
-    if (!skippy_iter.prev ()) return_trace (false);
+    unsigned unsafe_from;
+    if (!skippy_iter.prev (&unsafe_from))
+    {
+      buffer->unsafe_to_concat_from_outbuffer (unsafe_from, buffer->idx + 1);
+      return_trace (false);
+    }
 
     /* Checking that matched glyph is actually a ligature by GDEF is too strong; disabled */
     //if (!_hb_glyph_info_is_ligature (&buffer->info[skippy_iter.idx])) { return_trace (false); }
 
     unsigned int j = skippy_iter.idx;
     unsigned int lig_index = (this+ligatureCoverage).get_coverage  (buffer->info[j].codepoint);
-    if (lig_index == NOT_COVERED) return_trace (false);
+    if (lig_index == NOT_COVERED)
+    {
+      buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
+      return_trace (false);
+    }
 
     const LigatureArray& lig_array = this+ligatureArray;
     const LigatureAttach& lig_attach = lig_array[lig_index];
 
     /* Find component to attach to */
     unsigned int comp_count = lig_attach.rows;
-    if (unlikely (!comp_count)) return_trace (false);
+    if (unlikely (!comp_count))
+    {
+      buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
+      return_trace (false);
+    }
 
     /* We must now check whether the ligature ID of the current mark glyph
      * is identical to the ligature ID of the found ligature.  If yes, we
@@ -2517,9 +2628,18 @@ struct MarkMarkPosFormat1
     hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
     skippy_iter.reset (buffer->idx, 1);
     skippy_iter.set_lookup_props (c->lookup_props & ~LookupFlag::IgnoreFlags);
-    if (!skippy_iter.prev ()) return_trace (false);
+    unsigned unsafe_from;
+    if (!skippy_iter.prev (&unsafe_from))
+    {
+      buffer->unsafe_to_concat_from_outbuffer (unsafe_from, buffer->idx + 1);
+      return_trace (false);
+    }
 
-    if (!_hb_glyph_info_is_mark (&buffer->info[skippy_iter.idx])) { return_trace (false); }
+    if (!_hb_glyph_info_is_mark (&buffer->info[skippy_iter.idx]))
+    {
+      buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
+      return_trace (false);
+    }
 
     unsigned int j = skippy_iter.idx;
 
@@ -2544,11 +2664,16 @@ struct MarkMarkPosFormat1
     }
 
     /* Didn't match. */
+    buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
     return_trace (false);
 
     good:
     unsigned int mark2_index = (this+mark2Coverage).get_coverage  (buffer->info[j].codepoint);
-    if (mark2_index == NOT_COVERED) return_trace (false);
+    if (mark2_index == NOT_COVERED)
+    {
+      buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
+      return_trace (false);
+    }
 
     return_trace ((this+mark1Array).apply (c, mark1_index, mark2_index, this+mark2Array, classCount, j));
   }
@@ -2951,7 +3076,7 @@ GPOS::position_finish_advances (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer H
 }
 
 void
-GPOS::position_finish_offsets (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
+GPOS::position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
 {
   _hb_buffer_assert_gsubgpos_vars (buffer);
 
@@ -2961,12 +3086,21 @@ GPOS::position_finish_offsets (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
 
   /* Handle attachments */
   if (buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT)
-    for (unsigned int i = 0; i < len; i++)
+    for (unsigned i = 0; i < len; i++)
       propagate_attachment_offsets (pos, len, i, direction);
+
+  if (unlikely (font->slant))
+  {
+    for (unsigned i = 0; i < len; i++)
+      if (unlikely (pos[i].y_offset))
+        pos[i].x_offset += _hb_roundf (font->slant_xy * pos[i].y_offset);
+  }
 }
 
 
-struct GPOS_accelerator_t : GPOS::accelerator_t {};
+struct GPOS_accelerator_t : GPOS::accelerator_t {
+  GPOS_accelerator_t (hb_face_t *face) : GPOS::accelerator_t (face) {}
+};
 
 
 /* Out-of-class implementation for methods recursing */
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout-gsub-table.hh b/thirdparty/harfbuzz/src/hb-ot-layout-gsub-table.hh
index b7ce30135e..0b0bc547bd 100644
--- a/thirdparty/harfbuzz/src/hb-ot-layout-gsub-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-layout-gsub-table.hh
@@ -826,22 +826,25 @@ struct Ligature
 
     unsigned int total_component_count = 0;
 
-    unsigned int match_length = 0;
+    unsigned int match_end = 0;
     unsigned int match_positions[HB_MAX_CONTEXT_LENGTH];
 
     if (likely (!match_input (c, count,
 			      &component[1],
 			      match_glyph,
 			      nullptr,
-			      &match_length,
+			      &match_end,
 			      match_positions,
 			      &total_component_count)))
+    {
+      c->buffer->unsafe_to_concat (c->buffer->idx, match_end);
       return_trace (false);
+    }
 
     ligate_input (c,
 		  count,
 		  match_positions,
-		  match_length,
+		  match_end,
 		  ligGlyph,
 		  total_component_count);
 
@@ -1296,7 +1299,7 @@ struct ReverseChainSingleSubstFormat1
 	match_lookahead (c,
 			 lookahead.len, (HBUINT16 *) lookahead.arrayZ,
 			 match_coverage, this,
-			 1, &end_index))
+			 c->buffer->idx + 1, &end_index))
     {
       c->buffer->unsafe_to_break_from_outbuffer (start_index, end_index);
       c->replace_glyph_inplace (substitute[index]);
@@ -1305,8 +1308,11 @@ struct ReverseChainSingleSubstFormat1
        * calls us through a Context lookup. */
       return_trace (true);
     }
-
-    return_trace (false);
+    else
+    {
+      c->buffer->unsafe_to_concat_from_outbuffer (start_index, end_index);
+      return_trace (false);
+    }
   }
 
   template<typename Iterator,
@@ -1739,7 +1745,9 @@ struct GSUB : GSUBGPOS
 };
 
 
-struct GSUB_accelerator_t : GSUB::accelerator_t {};
+struct GSUB_accelerator_t : GSUB::accelerator_t {
+  GSUB_accelerator_t (hb_face_t *face) : GSUB::accelerator_t (face) {}
+};
 
 
 /* Out-of-class implementation for methods recursing */
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout-gsubgpos.hh b/thirdparty/harfbuzz/src/hb-ot-layout-gsubgpos.hh
index 191d3bebc5..65de131f85 100644
--- a/thirdparty/harfbuzz/src/hb-ot-layout-gsubgpos.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-layout-gsubgpos.hh
@@ -125,24 +125,31 @@ struct hb_closure_context_t :
     hb_set_t *covered_glyph_set = done_lookups_glyph_set->get (lookup_index);
     if (unlikely (covered_glyph_set->in_error ()))
       return true;
-    if (parent_active_glyphs ()->is_subset (*covered_glyph_set))
+    if (parent_active_glyphs ().is_subset (*covered_glyph_set))
       return true;
 
-    hb_set_union (covered_glyph_set, parent_active_glyphs ());
+    covered_glyph_set->union_ (parent_active_glyphs ());
     return false;
   }
 
-  hb_set_t* parent_active_glyphs ()
+  const hb_set_t& previous_parent_active_glyphs () {
+    if (active_glyphs_stack.length <= 1)
+      return *glyphs;
+
+    return active_glyphs_stack[active_glyphs_stack.length - 2];
+  }
+
+  const hb_set_t& parent_active_glyphs ()
   {
-    if (active_glyphs_stack.length < 1)
-      return glyphs;
+    if (!active_glyphs_stack)
+      return *glyphs;
 
     return active_glyphs_stack.tail ();
   }
 
-  void push_cur_active_glyphs (hb_set_t* cur_active_glyph_set)
+  hb_set_t& push_cur_active_glyphs ()
   {
-    active_glyphs_stack.push (cur_active_glyph_set);
+    return *active_glyphs_stack.push ();
   }
 
   bool pop_cur_done_glyphs ()
@@ -156,29 +163,24 @@ struct hb_closure_context_t :
 
   hb_face_t *face;
   hb_set_t *glyphs;
-  hb_set_t *cur_intersected_glyphs;
   hb_set_t output[1];
-  hb_vector_t<hb_set_t *> active_glyphs_stack;
+  hb_vector_t<hb_set_t> active_glyphs_stack;
   recurse_func_t recurse_func;
   unsigned int nesting_level_left;
 
   hb_closure_context_t (hb_face_t *face_,
 			hb_set_t *glyphs_,
-			hb_set_t *cur_intersected_glyphs_,
 			hb_map_t *done_lookups_glyph_count_,
 			hb_hashmap_t<unsigned, hb_set_t *> *done_lookups_glyph_set_,
 			unsigned int nesting_level_left_ = HB_MAX_NESTING_LEVEL) :
 			  face (face_),
 			  glyphs (glyphs_),
-			  cur_intersected_glyphs (cur_intersected_glyphs_),
 			  recurse_func (nullptr),
 			  nesting_level_left (nesting_level_left_),
 			  done_lookups_glyph_count (done_lookups_glyph_count_),
 			  done_lookups_glyph_set (done_lookups_glyph_set_),
 			  lookup_count (0)
-  {
-    push_cur_active_glyphs (glyphs_);
-  }
+  {}
 
   ~hb_closure_context_t () { flush (); }
 
@@ -186,11 +188,11 @@ struct hb_closure_context_t :
 
   void flush ()
   {
-    hb_set_del_range (output, face->get_num_glyphs (), HB_SET_VALUE_INVALID);	/* Remove invalid glyphs. */
-    hb_set_union (glyphs, output);
-    hb_set_clear (output);
+    output->del_range (face->get_num_glyphs (), HB_SET_VALUE_INVALID);	/* Remove invalid glyphs. */
+    glyphs->union_ (*output);
+    output->clear ();
     active_glyphs_stack.pop ();
-    active_glyphs_stack.fini ();
+    active_glyphs_stack.reset ();
   }
 
   private:
@@ -520,7 +522,7 @@ struct hb_ot_apply_context_t :
     may_skip (const hb_glyph_info_t &info) const
     { return matcher.may_skip (c, info); }
 
-    bool next ()
+    bool next (unsigned *unsafe_to = nullptr)
     {
       assert (num_items > 0);
       while (idx + num_items < end)
@@ -543,11 +545,17 @@ struct hb_ot_apply_context_t :
 	}
 
 	if (skip == matcher_t::SKIP_NO)
+	{
+	  if (unsafe_to)
+	    *unsafe_to = idx + 1;
 	  return false;
+	}
       }
+      if (unsafe_to)
+        *unsafe_to = end;
       return false;
     }
-    bool prev ()
+    bool prev (unsigned *unsafe_from = nullptr)
     {
       assert (num_items > 0);
       while (idx > num_items - 1)
@@ -570,8 +578,14 @@ struct hb_ot_apply_context_t :
 	}
 
 	if (skip == matcher_t::SKIP_NO)
+	{
+	  if (unsafe_from)
+	    *unsafe_from = hb_max (1u, idx) - 1u;
 	  return false;
+	}
       }
+      if (unsafe_from)
+        *unsafe_from = 0;
       return false;
     }
 
@@ -712,53 +726,60 @@ struct hb_ot_apply_context_t :
     return true;
   }
 
-  void _set_glyph_props (hb_codepoint_t glyph_index,
+  void _set_glyph_class (hb_codepoint_t glyph_index,
 			  unsigned int class_guess = 0,
 			  bool ligature = false,
 			  bool component = false) const
   {
-    unsigned int add_in = _hb_glyph_info_get_glyph_props (&buffer->cur()) &
-			  HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE;
-    add_in |= HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED;
+    unsigned int props = _hb_glyph_info_get_glyph_props (&buffer->cur());
+    props |= HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED;
     if (ligature)
     {
-      add_in |= HB_OT_LAYOUT_GLYPH_PROPS_LIGATED;
+      props |= HB_OT_LAYOUT_GLYPH_PROPS_LIGATED;
       /* In the only place that the MULTIPLIED bit is used, Uniscribe
        * seems to only care about the "last" transformation between
        * Ligature and Multiple substitutions.  Ie. if you ligate, expand,
        * and ligate again, it forgives the multiplication and acts as
        * if only ligation happened.  As such, clear MULTIPLIED bit.
        */
-      add_in &= ~HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
+      props &= ~HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
     }
     if (component)
-      add_in |= HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
+      props |= HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
     if (likely (has_glyph_classes))
-      _hb_glyph_info_set_glyph_props (&buffer->cur(), add_in | gdef.get_glyph_props (glyph_index));
+    {
+      props &= HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE;
+      _hb_glyph_info_set_glyph_props (&buffer->cur(), props | gdef.get_glyph_props (glyph_index));
+    }
     else if (class_guess)
-      _hb_glyph_info_set_glyph_props (&buffer->cur(), add_in | class_guess);
+    {
+      props &= HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE;
+      _hb_glyph_info_set_glyph_props (&buffer->cur(), props | class_guess);
+    }
+    else
+      _hb_glyph_info_set_glyph_props (&buffer->cur(), props);
   }
 
   void replace_glyph (hb_codepoint_t glyph_index) const
   {
-    _set_glyph_props (glyph_index);
+    _set_glyph_class (glyph_index);
     (void) buffer->replace_glyph (glyph_index);
   }
   void replace_glyph_inplace (hb_codepoint_t glyph_index) const
   {
-    _set_glyph_props (glyph_index);
+    _set_glyph_class (glyph_index);
     buffer->cur().codepoint = glyph_index;
   }
   void replace_glyph_with_ligature (hb_codepoint_t glyph_index,
 				    unsigned int class_guess) const
   {
-    _set_glyph_props (glyph_index, class_guess, true);
+    _set_glyph_class (glyph_index, class_guess, true);
     (void) buffer->replace_glyph (glyph_index);
   }
   void output_glyph_for_component (hb_codepoint_t glyph_index,
 				   unsigned int class_guess) const
   {
-    _set_glyph_props (glyph_index, class_guess, false, true);
+    _set_glyph_class (glyph_index, class_guess, false, true);
     (void) buffer->output_glyph (glyph_index);
   }
 };
@@ -948,7 +969,7 @@ static inline bool match_input (hb_ot_apply_context_t *c,
 				const HBUINT16 input[], /* Array of input values--start with second glyph */
 				match_func_t match_func,
 				const void *match_data,
-				unsigned int *end_offset,
+				unsigned int *end_position,
 				unsigned int match_positions[HB_MAX_CONTEXT_LENGTH],
 				unsigned int *p_total_component_count = nullptr)
 {
@@ -1001,7 +1022,12 @@ static inline bool match_input (hb_ot_apply_context_t *c,
   match_positions[0] = buffer->idx;
   for (unsigned int i = 1; i < count; i++)
   {
-    if (!skippy_iter.next ()) return_trace (false);
+    unsigned unsafe_to;
+    if (!skippy_iter.next (&unsafe_to))
+    {
+      *end_position = unsafe_to;
+      return_trace (false);
+    }
 
     match_positions[i] = skippy_iter.idx;
 
@@ -1055,7 +1081,7 @@ static inline bool match_input (hb_ot_apply_context_t *c,
     total_component_count += _hb_glyph_info_get_lig_num_comps (&buffer->info[skippy_iter.idx]);
   }
 
-  *end_offset = skippy_iter.idx - buffer->idx + 1;
+  *end_position = skippy_iter.idx + 1;
 
   if (p_total_component_count)
     *p_total_component_count = total_component_count;
@@ -1065,7 +1091,7 @@ static inline bool match_input (hb_ot_apply_context_t *c,
 static inline bool ligate_input (hb_ot_apply_context_t *c,
 				 unsigned int count, /* Including the first glyph */
 				 const unsigned int match_positions[HB_MAX_CONTEXT_LENGTH], /* Including the first glyph */
-				 unsigned int match_length,
+				 unsigned int match_end,
 				 hb_codepoint_t lig_glyph,
 				 unsigned int total_component_count)
 {
@@ -1073,7 +1099,7 @@ static inline bool ligate_input (hb_ot_apply_context_t *c,
 
   hb_buffer_t *buffer = c->buffer;
 
-  buffer->merge_clusters (buffer->idx, buffer->idx + match_length);
+  buffer->merge_clusters (buffer->idx, match_end);
 
   /* - If a base and one or more marks ligate, consider that as a base, NOT
    *   ligature, such that all following marks can still attach to it.
@@ -1190,11 +1216,16 @@ static inline bool match_backtrack (hb_ot_apply_context_t *c,
   skippy_iter.set_match_func (match_func, match_data, backtrack);
 
   for (unsigned int i = 0; i < count; i++)
-    if (!skippy_iter.prev ())
+  {
+    unsigned unsafe_from;
+    if (!skippy_iter.prev (&unsafe_from))
+    {
+      *match_start = unsafe_from;
       return_trace (false);
+    }
+  }
 
   *match_start = skippy_iter.idx;
-
   return_trace (true);
 }
 
@@ -1203,21 +1234,26 @@ static inline bool match_lookahead (hb_ot_apply_context_t *c,
 				    const HBUINT16 lookahead[],
 				    match_func_t match_func,
 				    const void *match_data,
-				    unsigned int offset,
+				    unsigned int start_index,
 				    unsigned int *end_index)
 {
   TRACE_APPLY (nullptr);
 
   hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_context;
-  skippy_iter.reset (c->buffer->idx + offset - 1, count);
+  skippy_iter.reset (start_index - 1, count);
   skippy_iter.set_match_func (match_func, match_data, lookahead);
 
   for (unsigned int i = 0; i < count; i++)
-    if (!skippy_iter.next ())
+  {
+    unsigned unsafe_to;
+    if (!skippy_iter.next (&unsafe_to))
+    {
+      *end_index = unsafe_to;
       return_trace (false);
+    }
+  }
 
   *end_index = skippy_iter.idx + 1;
-
   return_trace (true);
 }
 
@@ -1284,22 +1320,23 @@ static void context_closure_recurse_lookups (hb_closure_context_t *c,
     unsigned seqIndex = lookupRecord[i].sequenceIndex;
     if (seqIndex >= inputCount) continue;
 
-    hb_set_t *pos_glyphs = nullptr;
+    bool has_pos_glyphs = false;
+    hb_set_t pos_glyphs;
 
     if (hb_set_is_empty (covered_seq_indicies) || !hb_set_has (covered_seq_indicies, seqIndex))
     {
-      pos_glyphs = hb_set_create ();
+      has_pos_glyphs = true;
       if (seqIndex == 0)
       {
         switch (context_format) {
         case ContextFormat::SimpleContext:
-          pos_glyphs->add (value);
+          pos_glyphs.add (value);
           break;
         case ContextFormat::ClassBasedContext:
-          intersected_glyphs_func (c->cur_intersected_glyphs, data, value, pos_glyphs);
+          intersected_glyphs_func (&c->parent_active_glyphs (), data, value, &pos_glyphs);
           break;
         case ContextFormat::CoverageBasedContext:
-          hb_set_set (pos_glyphs, c->cur_intersected_glyphs);
+          pos_glyphs.set (c->parent_active_glyphs ());
           break;
         }
       }
@@ -1313,12 +1350,16 @@ static void context_closure_recurse_lookups (hb_closure_context_t *c,
           input_value = input[seqIndex - 1];
         }
 
-        intersected_glyphs_func (c->glyphs, input_data, input_value, pos_glyphs);
+        intersected_glyphs_func (c->glyphs, input_data, input_value, &pos_glyphs);
       }
     }
 
-    hb_set_add (covered_seq_indicies, seqIndex);
-    c->push_cur_active_glyphs (pos_glyphs ? pos_glyphs : c->glyphs);
+    covered_seq_indicies->add (seqIndex);
+    if (has_pos_glyphs) {
+      c->push_cur_active_glyphs () = pos_glyphs;
+    } else {
+      c->push_cur_active_glyphs ().set (*c->glyphs);
+    }
 
     unsigned endIndex = inputCount;
     if (context_format == ContextFormat::CoverageBasedContext)
@@ -1327,8 +1368,6 @@ static void context_closure_recurse_lookups (hb_closure_context_t *c,
     c->recurse (lookupRecord[i].lookupListIndex, covered_seq_indicies, seqIndex, endIndex);
 
     c->pop_cur_done_glyphs ();
-    if (pos_glyphs)
-      hb_set_destroy (pos_glyphs);
   }
 
   hb_set_destroy (covered_seq_indicies);
@@ -1343,15 +1382,13 @@ static inline void recurse_lookups (context_t *c,
     c->recurse (lookupRecord[i].lookupListIndex);
 }
 
-static inline bool apply_lookup (hb_ot_apply_context_t *c,
+static inline void apply_lookup (hb_ot_apply_context_t *c,
 				 unsigned int count, /* Including the first glyph */
 				 unsigned int match_positions[HB_MAX_CONTEXT_LENGTH], /* Including the first glyph */
 				 unsigned int lookupCount,
 				 const LookupRecord lookupRecord[], /* Array of LookupRecords--in design order */
-				 unsigned int match_length)
+				 unsigned int match_end)
 {
-  TRACE_APPLY (nullptr);
-
   hb_buffer_t *buffer = c->buffer;
   int end;
 
@@ -1359,7 +1396,7 @@ static inline bool apply_lookup (hb_ot_apply_context_t *c,
    * Adjust. */
   {
     unsigned int bl = buffer->backtrack_len ();
-    end = bl + match_length;
+    end = bl + match_end - buffer->idx;
 
     int delta = bl - buffer->idx;
     /* Convert positions to new indexing. */
@@ -1461,8 +1498,6 @@ static inline bool apply_lookup (hb_ot_apply_context_t *c,
   }
 
   (void) buffer->move_to (end);
-
-  return_trace (true);
 }
 
 
@@ -1550,17 +1585,25 @@ static inline bool context_apply_lookup (hb_ot_apply_context_t *c,
 					 const LookupRecord lookupRecord[],
 					 ContextApplyLookupContext &lookup_context)
 {
-  unsigned int match_length = 0;
-  unsigned int match_positions[HB_MAX_CONTEXT_LENGTH];
-  return match_input (c,
-		      inputCount, input,
-		      lookup_context.funcs.match, lookup_context.match_data,
-		      &match_length, match_positions)
-      && (c->buffer->unsafe_to_break (c->buffer->idx, c->buffer->idx + match_length),
-	  apply_lookup (c,
-		       inputCount, match_positions,
-		       lookupCount, lookupRecord,
-		       match_length));
+  unsigned match_end = 0;
+  unsigned match_positions[HB_MAX_CONTEXT_LENGTH];
+  if (match_input (c,
+		   inputCount, input,
+		   lookup_context.funcs.match, lookup_context.match_data,
+		   &match_end, match_positions))
+  {
+    c->buffer->unsafe_to_break (c->buffer->idx, match_end);
+    apply_lookup (c,
+		  inputCount, match_positions,
+		  lookupCount, lookupRecord,
+		  match_end);
+    return true;
+  }
+  else
+  {
+    c->buffer->unsafe_to_concat (c->buffer->idx, match_end);
+    return false;
+  }
 }
 
 struct Rule
@@ -1828,8 +1871,9 @@ struct ContextFormat1
 
   void closure (hb_closure_context_t *c) const
   {
-    c->cur_intersected_glyphs->clear ();
-    get_coverage ().intersected_coverage_glyphs (c->parent_active_glyphs (), c->cur_intersected_glyphs);
+    hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs ();
+    get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (),
+                                                 cur_active_glyphs);
 
     struct ContextClosureLookupContext lookup_context = {
       {intersects_glyph, intersected_glyph},
@@ -1838,10 +1882,14 @@ struct ContextFormat1
     };
 
     + hb_zip (this+coverage, hb_range ((unsigned) ruleSet.len))
-    | hb_filter (c->parent_active_glyphs (), hb_first)
+    | hb_filter ([&] (hb_codepoint_t _) {
+      return c->previous_parent_active_glyphs ().has (_);
+    }, hb_first)
     | hb_map ([&](const hb_pair_t<hb_codepoint_t, unsigned> _) { return hb_pair_t<unsigned, const RuleSet&> (_.first, this+ruleSet[_.second]); })
     | hb_apply ([&] (const hb_pair_t<unsigned, const RuleSet&>& _) { _.second.closure (c, _.first, lookup_context); })
     ;
+
+    c->pop_cur_done_glyphs ();
   }
 
   void closure_lookups (hb_closure_lookups_context_t *c) const
@@ -1989,8 +2037,9 @@ struct ContextFormat2
     if (!(this+coverage).intersects (c->glyphs))
       return;
 
-    c->cur_intersected_glyphs->clear ();
-    get_coverage ().intersected_coverage_glyphs (c->parent_active_glyphs (), c->cur_intersected_glyphs);
+    hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs ();
+    get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (),
+                                                 cur_active_glyphs);
 
     const ClassDef &class_def = this+classDef;
 
@@ -2000,10 +2049,9 @@ struct ContextFormat2
       &class_def
     };
 
-    return
     + hb_enumerate (ruleSet)
     | hb_filter ([&] (unsigned _)
-		 { return class_def.intersects_class (c->cur_intersected_glyphs, _); },
+    { return class_def.intersects_class (&c->parent_active_glyphs (), _); },
 		 hb_first)
     | hb_apply ([&] (const hb_pair_t<unsigned, const Offset16To<RuleSet>&> _)
                 {
@@ -2011,6 +2059,8 @@ struct ContextFormat2
                   rule_set.closure (c, _.first, lookup_context);
                 })
     ;
+
+    c->pop_cur_done_glyphs ();
   }
 
   void closure_lookups (hb_closure_lookups_context_t *c) const
@@ -2183,8 +2233,10 @@ struct ContextFormat3
     if (!(this+coverageZ[0]).intersects (c->glyphs))
       return;
 
-    c->cur_intersected_glyphs->clear ();
-    get_coverage ().intersected_coverage_glyphs (c->parent_active_glyphs (), c->cur_intersected_glyphs);
+    hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs ();
+    get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (),
+                                                 cur_active_glyphs);
+
 
     const LookupRecord *lookupRecord = &StructAfter<LookupRecord> (coverageZ.as_array (glyphCount));
     struct ContextClosureLookupContext lookup_context = {
@@ -2196,6 +2248,8 @@ struct ContextFormat3
 			    glyphCount, (const HBUINT16 *) (coverageZ.arrayZ + 1),
 			    lookupCount, lookupRecord,
 			    0, lookup_context);
+
+    c->pop_cur_done_glyphs ();
   }
 
   void closure_lookups (hb_closure_lookups_context_t *c) const
@@ -2452,25 +2506,38 @@ static inline bool chain_context_apply_lookup (hb_ot_apply_context_t *c,
 					       const LookupRecord lookupRecord[],
 					       ChainContextApplyLookupContext &lookup_context)
 {
-  unsigned int start_index = 0, match_length = 0, end_index = 0;
-  unsigned int match_positions[HB_MAX_CONTEXT_LENGTH];
-  return match_input (c,
-		      inputCount, input,
-		      lookup_context.funcs.match, lookup_context.match_data[1],
-		      &match_length, match_positions)
-      && match_backtrack (c,
-			  backtrackCount, backtrack,
-			  lookup_context.funcs.match, lookup_context.match_data[0],
-			  &start_index)
-      && match_lookahead (c,
-			  lookaheadCount, lookahead,
-			  lookup_context.funcs.match, lookup_context.match_data[2],
-			  match_length, &end_index)
-      && (c->buffer->unsafe_to_break_from_outbuffer (start_index, end_index),
-	  apply_lookup (c,
-			inputCount, match_positions,
-			lookupCount, lookupRecord,
-			match_length));
+  unsigned end_index = c->buffer->idx;
+  unsigned match_end = 0;
+  unsigned match_positions[HB_MAX_CONTEXT_LENGTH];
+  if (!(match_input (c,
+		     inputCount, input,
+		     lookup_context.funcs.match, lookup_context.match_data[1],
+		     &match_end, match_positions) && (end_index = match_end)
+       && match_lookahead (c,
+			   lookaheadCount, lookahead,
+			   lookup_context.funcs.match, lookup_context.match_data[2],
+			   match_end, &end_index)))
+  {
+    c->buffer->unsafe_to_concat (c->buffer->idx, end_index);
+    return false;
+  }
+
+  unsigned start_index = c->buffer->out_len;
+  if (!match_backtrack (c,
+			backtrackCount, backtrack,
+			lookup_context.funcs.match, lookup_context.match_data[0],
+			&start_index))
+  {
+    c->buffer->unsafe_to_concat_from_outbuffer (start_index, end_index);
+    return false;
+  }
+
+  c->buffer->unsafe_to_break_from_outbuffer (start_index, end_index);
+  apply_lookup (c,
+		inputCount, match_positions,
+		lookupCount, lookupRecord,
+		match_end);
+  return true;
 }
 
 struct ChainRule
@@ -2802,8 +2869,9 @@ struct ChainContextFormat1
 
   void closure (hb_closure_context_t *c) const
   {
-    c->cur_intersected_glyphs->clear ();
-    get_coverage ().intersected_coverage_glyphs (c->parent_active_glyphs (), c->cur_intersected_glyphs);
+    hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs ();
+    get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (),
+                                                 cur_active_glyphs);
 
     struct ChainContextClosureLookupContext lookup_context = {
       {intersects_glyph, intersected_glyph},
@@ -2812,10 +2880,14 @@ struct ChainContextFormat1
     };
 
     + hb_zip (this+coverage, hb_range ((unsigned) ruleSet.len))
-    | hb_filter (c->parent_active_glyphs (), hb_first)
+    | hb_filter ([&] (hb_codepoint_t _) {
+      return c->previous_parent_active_glyphs ().has (_);
+    }, hb_first)
     | hb_map ([&](const hb_pair_t<hb_codepoint_t, unsigned> _) { return hb_pair_t<unsigned, const ChainRuleSet&> (_.first, this+ruleSet[_.second]); })
     | hb_apply ([&] (const hb_pair_t<unsigned, const ChainRuleSet&>& _) { _.second.closure (c, _.first, lookup_context); })
     ;
+
+    c->pop_cur_done_glyphs ();
   }
 
   void closure_lookups (hb_closure_lookups_context_t *c) const
@@ -2964,8 +3036,10 @@ struct ChainContextFormat2
     if (!(this+coverage).intersects (c->glyphs))
       return;
 
-    c->cur_intersected_glyphs->clear ();
-    get_coverage ().intersected_coverage_glyphs (c->parent_active_glyphs (), c->cur_intersected_glyphs);
+    hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs ();
+    get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (),
+                                                 cur_active_glyphs);
+
 
     const ClassDef &backtrack_class_def = this+backtrackClassDef;
     const ClassDef &input_class_def = this+inputClassDef;
@@ -2979,10 +3053,9 @@ struct ChainContextFormat2
        &lookahead_class_def}
     };
 
-    return
     + hb_enumerate (ruleSet)
     | hb_filter ([&] (unsigned _)
-		 { return input_class_def.intersects_class (c->cur_intersected_glyphs, _); },
+    { return input_class_def.intersects_class (&c->parent_active_glyphs (), _); },
 		 hb_first)
     | hb_apply ([&] (const hb_pair_t<unsigned, const Offset16To<ChainRuleSet>&> _)
                 {
@@ -2990,6 +3063,8 @@ struct ChainContextFormat2
                   chainrule_set.closure (c, _.first, lookup_context);
                 })
     ;
+
+    c->pop_cur_done_glyphs ();
   }
 
   void closure_lookups (hb_closure_lookups_context_t *c) const
@@ -3216,8 +3291,10 @@ struct ChainContextFormat3
     if (!(this+input[0]).intersects (c->glyphs))
       return;
 
-    c->cur_intersected_glyphs->clear ();
-    get_coverage ().intersected_coverage_glyphs (c->parent_active_glyphs (), c->cur_intersected_glyphs);
+    hb_set_t* cur_active_glyphs = &c->push_cur_active_glyphs ();
+    get_coverage ().intersected_coverage_glyphs (&c->previous_parent_active_glyphs (),
+                                                 cur_active_glyphs);
+
 
     const Array16OfOffset16To<Coverage> &lookahead = StructAfter<Array16OfOffset16To<Coverage>> (input);
     const Array16Of<LookupRecord> &lookup = StructAfter<Array16Of<LookupRecord>> (lookahead);
@@ -3232,6 +3309,8 @@ struct ChainContextFormat3
 				  lookahead.len, (const HBUINT16 *) lookahead.arrayZ,
 				  lookup.len, lookup.arrayZ,
 				  0, lookup_context);
+
+    c->pop_cur_done_glyphs ();
   }
 
   void closure_lookups (hb_closure_lookups_context_t *c) const
@@ -3706,7 +3785,7 @@ struct GSUBGPOS
     for (unsigned i : feature_indices->iter ())
     {
       hb_tag_t t = get_feature_tag (i);
-      if (t == unique_features.INVALID_KEY) continue;
+      if (t == HB_MAP_VALUE_INVALID) continue;
       if (!unique_features.has (t))
       {
         hb_set_t* indices = hb_set_create ();
@@ -3839,7 +3918,7 @@ struct GSUBGPOS
   template <typename T>
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     {
       this->table = hb_sanitize_context_t ().reference_table<T> (face);
       if (unlikely (this->table->is_blocklisted (this->table.get_blob (), face)))
@@ -3861,8 +3940,7 @@ struct GSUBGPOS
       for (unsigned int i = 0; i < this->lookup_count; i++)
 	this->accels[i].init (table->get_lookup (i));
     }
-
-    void fini ()
+    ~accelerator_t ()
     {
       for (unsigned int i = 0; i < this->lookup_count; i++)
 	this->accels[i].fini ();
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout.cc b/thirdparty/harfbuzz/src/hb-ot-layout.cc
index 60733648c1..a599eea6e9 100644
--- a/thirdparty/harfbuzz/src/hb-ot-layout.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-layout.cc
@@ -1491,10 +1491,9 @@ hb_ot_layout_lookup_substitute_closure (hb_face_t    *face,
 					unsigned int  lookup_index,
 					hb_set_t     *glyphs /* OUT */)
 {
-  hb_set_t cur_intersected_glyphs;
   hb_map_t done_lookups_glyph_count;
   hb_hashmap_t<unsigned, hb_set_t *> done_lookups_glyph_set;
-  OT::hb_closure_context_t c (face, glyphs, &cur_intersected_glyphs, &done_lookups_glyph_count, &done_lookups_glyph_set);
+  OT::hb_closure_context_t c (face, glyphs, &done_lookups_glyph_count, &done_lookups_glyph_set);
 
   const OT::SubstLookup& l = face->table.GSUB->table->get_lookup (lookup_index);
 
@@ -1520,10 +1519,9 @@ hb_ot_layout_lookups_substitute_closure (hb_face_t      *face,
 					 const hb_set_t *lookups,
 					 hb_set_t       *glyphs /* OUT */)
 {
-  hb_set_t cur_intersected_glyphs;
   hb_map_t done_lookups_glyph_count;
   hb_hashmap_t<unsigned, hb_set_t *> done_lookups_glyph_set;
-  OT::hb_closure_context_t c (face, glyphs, &cur_intersected_glyphs, &done_lookups_glyph_count, &done_lookups_glyph_set);
+  OT::hb_closure_context_t c (face, glyphs, &done_lookups_glyph_count, &done_lookups_glyph_set);
   const OT::GSUB& gsub = *face->table.GSUB->table;
 
   unsigned int iteration_count = 0;
@@ -1890,7 +1888,7 @@ apply_string (OT::hb_ot_apply_context_t *c,
     apply_forward (c, accel);
 
     if (!Proxy::inplace)
-      buffer->swap_buffers ();
+      buffer->sync ();
   }
   else
   {
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout.hh b/thirdparty/harfbuzz/src/hb-ot-layout.hh
index 2c825e0c81..ede8f007db 100644
--- a/thirdparty/harfbuzz/src/hb-ot-layout.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-layout.hh
@@ -482,10 +482,9 @@ _hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info)
 }
 
 static inline uint8_t
-_hb_allocate_lig_id (hb_buffer_t *buffer) {
+_hb_allocate_lig_id (hb_buffer_t *buffer)
+{
   uint8_t lig_id = buffer->next_serial () & 0x07;
-  if (unlikely (!lig_id))
-    lig_id = _hb_allocate_lig_id (buffer); /* in case of overflow */
   return lig_id;
 }
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-meta-table.hh b/thirdparty/harfbuzz/src/hb-ot-meta-table.hh
index e31447f8fc..93e64c5327 100644
--- a/thirdparty/harfbuzz/src/hb-ot-meta-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-meta-table.hh
@@ -71,9 +71,9 @@ struct meta
 
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     { table = hb_sanitize_context_t ().reference_table<meta> (face); }
-    void fini () { table.destroy (); }
+    ~accelerator_t () { table.destroy (); }
 
     hb_blob_t *reference_entry (hb_tag_t tag) const
     { return table->dataMaps.lsearch (tag).reference_entry (table.get_blob ()); }
@@ -119,7 +119,9 @@ struct meta
   DEFINE_SIZE_ARRAY (16, dataMaps);
 };
 
-struct meta_accelerator_t : meta::accelerator_t {};
+struct meta_accelerator_t : meta::accelerator_t {
+  meta_accelerator_t (hb_face_t *face) : meta::accelerator_t (face) {}
+};
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-metrics.cc b/thirdparty/harfbuzz/src/hb-ot-metrics.cc
index dbd4a1ffbe..103808cf91 100644
--- a/thirdparty/harfbuzz/src/hb-ot-metrics.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-metrics.cc
@@ -160,9 +160,50 @@ hb_ot_metrics_get_position (hb_font_t           *font,
     (position && (*position = font->em_scalef_y (face->table.TABLE->ATTR + GET_VAR)), true))
   case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT:  return GET_METRIC_Y (OS2, usWinAscent);
   case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT: return GET_METRIC_Y (OS2, usWinDescent);
-  case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE:       return GET_METRIC_Y (hhea, caretSlopeRise);
-  case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN:        return GET_METRIC_X (hhea, caretSlopeRun);
+
+  case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE:
+  case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN:
+  {
+    unsigned mult = 1u;
+
+    if (font->slant)
+    {
+      unsigned rise = face->table.hhea->caretSlopeRise;
+      unsigned upem = face->get_upem ();
+      mult = (rise && rise < upem) ? hb_min (upem / rise, 256u) : 1u;
+    }
+
+    if (metrics_tag == HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE)
+    {
+      bool ret = GET_METRIC_Y (hhea, caretSlopeRise);
+
+      if (position)
+	*position *= mult;
+
+      return ret;
+    }
+    else
+    {
+      hb_position_t rise = 0;
+
+      if (font->slant && position && GET_METRIC_Y (hhea, caretSlopeRise))
+	rise = *position;
+
+      bool ret = GET_METRIC_X (hhea, caretSlopeRun);
+
+      if (position)
+      {
+	*position *= mult;
+
+	if (font->slant)
+	  *position += _hb_roundf (mult * font->slant_xy * rise);
+      }
+
+      return ret;
+    }
+  }
   case HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET:     return GET_METRIC_X (hhea, caretOffset);
+
 #ifndef HB_NO_VERTICAL
   case HB_OT_METRICS_TAG_VERTICAL_CARET_RISE:         return GET_METRIC_X (vhea, caretSlopeRise);
   case HB_OT_METRICS_TAG_VERTICAL_CARET_RUN:          return GET_METRIC_Y (vhea, caretSlopeRun);
diff --git a/thirdparty/harfbuzz/src/hb-ot-name-table.hh b/thirdparty/harfbuzz/src/hb-ot-name-table.hh
index c17bb4abb8..d52367e9b1 100644
--- a/thirdparty/harfbuzz/src/hb-ot-name-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-name-table.hh
@@ -256,7 +256,7 @@ struct name
     })
     ;
 
-    name_prime->serialize (c->serializer, it, hb_addressof (this + stringOffset));
+    name_prime->serialize (c->serializer, it, std::addressof (this + stringOffset));
     return_trace (name_prime->count);
   }
 
@@ -279,7 +279,7 @@ struct name
 
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     {
       this->table = hb_sanitize_context_t ().reference_table<name> (face);
       assert (this->table.get_length () >= this->table->stringOffset);
@@ -288,7 +288,6 @@ struct name
       const hb_array_t<const NameRecord> all_names (this->table->nameRecordZ.arrayZ,
 						    this->table->count);
 
-      this->names.init ();
       this->names.alloc (all_names.length);
 
       for (unsigned int i = 0; i < all_names.length; i++)
@@ -318,10 +317,8 @@ struct name
       }
       this->names.resize (j);
     }
-
-    void fini ()
+    ~accelerator_t ()
     {
-      this->names.fini ();
       this->table.destroy ();
     }
 
@@ -373,7 +370,9 @@ struct name
 #undef entry_index
 #undef entry_score
 
-struct name_accelerator_t : name::accelerator_t {};
+struct name_accelerator_t : name::accelerator_t {
+  name_accelerator_t (hb_face_t *face) : name::accelerator_t (face) {}
+};
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-post-table-v2subset.hh b/thirdparty/harfbuzz/src/hb-ot-post-table-v2subset.hh
index 504de2de74..0f3cd8e24f 100644
--- a/thirdparty/harfbuzz/src/hb-ot-post-table-v2subset.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-post-table-v2subset.hh
@@ -76,8 +76,7 @@ HB_INTERNAL bool postV2Tail::subset (hb_subset_context_t *c) const
   hb_map_t old_new_index_map, old_gid_new_index_map;
   unsigned i = 0;
 
-  post::accelerator_t _post;
-  _post.init (c->plan->source);
+  post::accelerator_t _post (c->plan->source);
 
   hb_hashmap_t<hb_bytes_t, unsigned, std::nullptr_t, unsigned, nullptr, (unsigned)-1> glyph_name_to_new_index;
   for (hb_codepoint_t new_gid = 0; new_gid < num_glyphs; new_gid++)
@@ -128,9 +127,7 @@ HB_INTERNAL bool postV2Tail::subset (hb_subset_context_t *c) const
                             })
   ;
 
-  bool ret = serialize (c->serializer, index_iter, &_post);
-  _post.fini ();
-  return_trace (ret);
+  return_trace (serialize (c->serializer, index_iter, &_post));
 }
 
 } /* namespace OT */
diff --git a/thirdparty/harfbuzz/src/hb-ot-post-table.hh b/thirdparty/harfbuzz/src/hb-ot-post-table.hh
index 39de671707..a4844e94bc 100644
--- a/thirdparty/harfbuzz/src/hb-ot-post-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-post-table.hh
@@ -111,10 +111,9 @@ struct post
   struct accelerator_t
   {
     friend struct postV2Tail;
-    void init (hb_face_t *face)
-    {
-      index_to_offset.init ();
 
+    accelerator_t (hb_face_t *face)
+    {
       table = hb_sanitize_context_t ().reference_table<post> (face);
       unsigned int table_length = table.get_length ();
 
@@ -132,9 +131,8 @@ struct post
 	   data += 1 + *data)
 	index_to_offset.push (data - pool);
     }
-    void fini ()
+    ~accelerator_t ()
     {
-      index_to_offset.fini ();
       hb_free (gids_sorted_by_name.get ());
       table.destroy ();
     }
@@ -254,9 +252,9 @@ struct post
 
     private:
     uint32_t version;
-    const Array16Of<HBUINT16> *glyphNameIndex;
+    const Array16Of<HBUINT16> *glyphNameIndex = nullptr;
     hb_vector_t<uint32_t> index_to_offset;
-    const uint8_t *pool;
+    const uint8_t *pool = nullptr;
     hb_atomic_ptr_t<uint16_t *> gids_sorted_by_name;
   };
 
@@ -307,7 +305,10 @@ struct post
   DEFINE_SIZE_MIN (32);
 };
 
-struct post_accelerator_t : post::accelerator_t {};
+struct post_accelerator_t : post::accelerator_t {
+  post_accelerator_t (hb_face_t *face) : post::accelerator_t (face) {}
+};
+
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic-win1256.hh b/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic-win1256.hh
index 41e3dd38ab..429974d05b 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic-win1256.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic-win1256.hh
@@ -87,6 +87,8 @@
 
 #define OT_GLYPHID /* GlyphID */ \
 	OT_UINT16
+/* Shorthand. */
+#define G	OT_GLYPHID
 
 #define OT_UARRAY(Name, Items) \
 	OT_LABEL_START(Name) \
@@ -183,8 +185,6 @@
 	Tag \
 	OT_OFFSET(manifest, Name)
 
-/* Shorthand. */
-#define G	OT_GLYPHID
 
 /*
  * Table Start
@@ -300,14 +300,40 @@ OT_TABLE_END
 /*
  * Clean up
  */
+
+#undef MANIFEST
+#undef MANIFEST_LOOKUP
+
 #undef OT_TABLE_START
 #undef OT_TABLE_END
 #undef OT_LABEL_START
 #undef OT_LABEL_END
 #undef OT_UINT8
 #undef OT_UINT16
-#undef OT_DISTANCE
 #undef OT_COUNT
+#undef OT_DISTANCE
+
+#undef OT_LABEL
+#undef OT_LIST
+
+#undef OT_TAG
+#undef OT_OFFSET
+#undef OT_GLYPHID
+#undef G
+#undef OT_UARRAY
+#undef OT_UHEADLESSARRAY
+
+#undef OT_LOOKUP_FLAG_IGNORE_MARKS
+#undef OT_LOOKUP
+#undef OT_SUBLOOKUP
+#undef OT_COVERAGE1
+#undef OT_LOOKUP_TYPE_SUBST_SINGLE
+#undef OT_LOOKUP_TYPE_SUBST_LIGATURE
+#undef OT_SUBLOOKUP_SINGLE_SUBST_FORMAT2
+#undef OT_SUBLOOKUP_LIGATURE_SUBST_FORMAT1
+#undef OT_LIGATURE_SET
+#undef OT_LIGATURE
+
 
 /*
  * Include a second time to get the table data...
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic.cc b/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic.cc
index 222c5d6b71..2298aa92f2 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-complex-arabic.cc
@@ -321,6 +321,20 @@ arabic_joining (hb_buffer_t *buffer)
       info[prev].arabic_shaping_action() = entry->prev_action;
       buffer->unsafe_to_break (prev, i + 1);
     }
+    else
+    {
+      if (prev == UINT_MAX)
+      {
+        if (this_type >= JOINING_TYPE_R)
+	  buffer->unsafe_to_concat_from_outbuffer (0, i + 1);
+      }
+      else
+      {
+	if (this_type >= JOINING_TYPE_R ||
+	    (2 <= state && state <= 5) /* States that have a possible prev_action. */)
+	  buffer->unsafe_to_concat (prev, i + 1);
+      }
+    }
 
     info[i].arabic_shaping_action() = entry->curr_action;
 
@@ -337,7 +351,14 @@ arabic_joining (hb_buffer_t *buffer)
 
     const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
     if (entry->prev_action != NONE && prev != UINT_MAX)
+    {
       info[prev].arabic_shaping_action() = entry->prev_action;
+      buffer->unsafe_to_break (prev, buffer->len);
+    }
+    else if (2 <= state && state <= 5) /* States that have a possible prev_action. */
+    {
+      buffer->unsafe_to_concat (prev, buffer->len);
+    }
     break;
   }
 }
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-complex-hangul.cc b/thirdparty/harfbuzz/src/hb-ot-shape-complex-hangul.cc
index 0d84a76b85..3bc9e9b961 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-complex-hangul.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-complex-hangul.cc
@@ -140,7 +140,7 @@ preprocess_text_hangul (const hb_ot_shape_plan_t *plan HB_UNUSED,
    *
    *   - LV can be precomposed, or decomposed.  Lets call those
    *     <LV> and <L,V>,
-   *   - LVT can be fully precomposed, partically precomposed, or
+   *   - LVT can be fully precomposed, partially precomposed, or
    *     fully decomposed.  Ie. <LVT>, <LV,T>, or <L,V,T>.
    *
    * The composition / decomposition is mechanical.  However, not
@@ -392,7 +392,7 @@ preprocess_text_hangul (const hb_ot_shape_plan_t *plan HB_UNUSED,
      */
     (void) buffer->next_glyph ();
   }
-  buffer->swap_buffers ();
+  buffer->sync ();
 }
 
 static void
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-complex-syllabic.cc b/thirdparty/harfbuzz/src/hb-ot-shape-complex-syllabic.cc
index 5a08f878dc..76092c7f38 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-complex-syllabic.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-complex-syllabic.cc
@@ -96,7 +96,7 @@ hb_syllabic_insert_dotted_circles (hb_font_t *font,
     else
       (void) buffer->next_glyph ();
   }
-  buffer->swap_buffers ();
+  buffer->sync ();
 }
 
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-complex-thai.cc b/thirdparty/harfbuzz/src/hb-ot-shape-complex-thai.cc
index 4c3068173b..a1e27a83be 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-complex-thai.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-complex-thai.cc
@@ -364,7 +364,7 @@ preprocess_text_thai (const hb_ot_shape_plan_t *plan,
 	buffer->merge_out_clusters (start - 1, end);
     }
   }
-  buffer->swap_buffers ();
+  buffer->sync ();
 
   /* If font has Thai GSUB, we are done. */
   if (plan->props.script == HB_SCRIPT_THAI && !plan->map.found_script[0])
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-complex-vowel-constraints.cc b/thirdparty/harfbuzz/src/hb-ot-shape-complex-vowel-constraints.cc
index 045731dfb4..d2cca105a4 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-complex-vowel-constraints.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-complex-vowel-constraints.cc
@@ -435,7 +435,7 @@ _hb_preprocess_text_vowel_constraints (const hb_ot_shape_plan_t *plan HB_UNUSED,
     default:
       break;
   }
-  buffer->swap_buffers ();
+  buffer->sync ();
 }
 
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-fallback.cc b/thirdparty/harfbuzz/src/hb-ot-shape-fallback.cc
index eb1bc79768..671f30327f 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-fallback.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-fallback.cc
@@ -446,6 +446,9 @@ _hb_ot_shape_fallback_mark_position (const hb_ot_shape_plan_t *plan,
   return;
 #endif
 
+  if (!buffer->message (font, "start fallback mark"))
+    return;
+
   _hb_buffer_assert_gsubgpos_vars (buffer);
 
   unsigned int start = 0;
@@ -457,6 +460,8 @@ _hb_ot_shape_fallback_mark_position (const hb_ot_shape_plan_t *plan,
       start = i;
     }
   position_cluster (plan, font, buffer, start, count, adjust_offsets_when_zeroing);
+
+  (void) buffer->message (font, "end fallback mark");
 }
 
 
@@ -492,6 +497,9 @@ _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
 #endif
 
 #ifndef HB_DISABLE_DEPRECATED
+  if (!buffer->message (font, "start fallback kern"))
+    return;
+
   if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction) ?
       !font->has_glyph_h_kerning_func () :
       !font->has_glyph_v_kerning_func ())
@@ -508,6 +516,8 @@ _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
 
   if (reverse)
     buffer->reverse ();
+
+  (void) buffer->message (font, "end fallback kern");
 #endif
 }
 
@@ -525,6 +535,15 @@ _hb_ot_shape_fallback_spaces (const hb_ot_shape_plan_t *plan HB_UNUSED,
   for (unsigned int i = 0; i < count; i++)
     if (_hb_glyph_info_is_unicode_space (&info[i]) && !_hb_glyph_info_ligated (&info[i]))
     {
+      /* If font had no ASCII space and we used the invisible glyph, give it a 1/4 EM default advance. */
+      if (buffer->invisible && info[i].codepoint == buffer->invisible)
+      {
+        if (horizontal)
+	  pos[i].x_advance = +font->x_scale / 4;
+        else
+	  pos[i].y_advance = -font->y_scale / 4;
+      }
+
       hb_unicode_funcs_t::space_t space_type = _hb_glyph_info_get_unicode_space_fallback_type (&info[i]);
       hb_codepoint_t glyph;
       typedef hb_unicode_funcs_t t;
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-normalize.cc b/thirdparty/harfbuzz/src/hb-ot-shape-normalize.cc
index 839cc9122c..aa5a8eeaa3 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape-normalize.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape-normalize.cc
@@ -193,7 +193,8 @@ decompose_current_character (const hb_ot_shape_normalize_context_t *c, bool shor
   {
     hb_codepoint_t space_glyph;
     hb_unicode_funcs_t::space_t space_type = buffer->unicode->space_fallback_type (u);
-    if (space_type != hb_unicode_funcs_t::NOT_SPACE && c->font->get_nominal_glyph (0x0020u, &space_glyph))
+    if (space_type != hb_unicode_funcs_t::NOT_SPACE &&
+	(c->font->get_nominal_glyph (0x0020, &space_glyph) || (space_glyph = buffer->invisible)))
     {
       _hb_glyph_info_set_unicode_space_fallback_type (&buffer->cur(), space_type);
       next_char (buffer, space_glyph);
@@ -374,7 +375,7 @@ _hb_ot_shape_normalize (const hb_ot_shape_plan_t *plan,
       decompose_multi_char_cluster (&c, end, always_short_circuit);
     }
     while (buffer->idx < count && buffer->successful);
-    buffer->swap_buffers ();
+    buffer->sync ();
   }
 
 
@@ -477,7 +478,7 @@ _hb_ot_shape_normalize (const hb_ot_shape_plan_t *plan,
       if (info_cc (buffer->prev()) == 0)
 	starter = buffer->out_len - 1;
     }
-    buffer->swap_buffers ();
+    buffer->sync ();
   }
 }
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape.cc b/thirdparty/harfbuzz/src/hb-ot-shape.cc
index 4dde3520d8..4bd8aaf03b 100644
--- a/thirdparty/harfbuzz/src/hb-ot-shape.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-shape.cc
@@ -566,7 +566,7 @@ hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
   info.mask = buffer->cur().mask;
   (void) buffer->output_info (info);
 
-  buffer->swap_buffers ();
+  buffer->sync ();
 }
 
 static void
@@ -1034,7 +1034,7 @@ hb_ot_position_complex (const hb_ot_shape_context_t *c)
    * hanging over the next glyph after the final reordering.
    *
    * Note: If fallback positinoing happens, we don't care about
-   * this as it will be overriden.
+   * this as it will be overridden.
    */
   bool adjust_offsets_when_zeroing = c->plan->adjust_mark_positioning_when_zeroing &&
 				     HB_DIRECTION_IS_FORWARD (c->buffer->props.direction);
@@ -1120,7 +1120,7 @@ hb_propagate_flags (hb_buffer_t *buffer)
   /* Propagate cluster-level glyph flags to be the same on all cluster glyphs.
    * Simplifies using them. */
 
-  if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK))
+  if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GLYPH_FLAGS))
     return;
 
   hb_glyph_info_t *info = buffer->info;
@@ -1129,11 +1129,7 @@ hb_propagate_flags (hb_buffer_t *buffer)
   {
     unsigned int mask = 0;
     for (unsigned int i = start; i < end; i++)
-      if (info[i].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK)
-      {
-	 mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
-	 break;
-      }
+      mask |= info[i].mask & HB_GLYPH_FLAG_DEFINED;
     if (mask)
       for (unsigned int i = start; i < end; i++)
 	info[i].mask |= mask;
@@ -1145,18 +1141,7 @@ hb_propagate_flags (hb_buffer_t *buffer)
 static void
 hb_ot_shape_internal (hb_ot_shape_context_t *c)
 {
-  c->buffer->deallocate_var_all ();
-  c->buffer->scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
-  if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_LEN_FACTOR)))
-  {
-    c->buffer->max_len = hb_max (c->buffer->len * HB_BUFFER_MAX_LEN_FACTOR,
-				 (unsigned) HB_BUFFER_MAX_LEN_MIN);
-  }
-  if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_OPS_FACTOR)))
-  {
-    c->buffer->max_ops = hb_max (c->buffer->len * HB_BUFFER_MAX_OPS_FACTOR,
-				 (unsigned) HB_BUFFER_MAX_OPS_MIN);
-  }
+  c->buffer->enter ();
 
   /* Save the original direction, we use it later. */
   c->target_direction = c->buffer->props.direction;
@@ -1188,9 +1173,7 @@ hb_ot_shape_internal (hb_ot_shape_context_t *c)
 
   c->buffer->props.direction = c->target_direction;
 
-  c->buffer->max_len = HB_BUFFER_MAX_LEN_DEFAULT;
-  c->buffer->max_ops = HB_BUFFER_MAX_OPS_DEFAULT;
-  c->buffer->deallocate_var_all ();
+  c->buffer->leave ();
 }
 
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-tag-table.hh b/thirdparty/harfbuzz/src/hb-ot-tag-table.hh
index 2c6316df4f..61d2814e93 100644
--- a/thirdparty/harfbuzz/src/hb-ot-tag-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-tag-table.hh
@@ -6,8 +6,8 @@
  *
  * on files with these headers:
  *
- * <meta name="updated_at" content="2021-12-09 12:01 AM" />
- * File-Date: 2021-08-06
+ * <meta name="updated_at" content="2022-01-28 10:00 PM" />
+ * File-Date: 2021-12-29
  */
 
 #ifndef HB_OT_TAG_TABLE_HH
@@ -66,7 +66,7 @@ static const LangTag ot_languages[] = {
   {"an",	HB_TAG('A','R','G',' ')},	/* Aragonese */
 /*{"ang",	HB_TAG('A','N','G',' ')},*/	/* Old English (ca. 450-1100) -> Anglo-Saxon */
   {"aoa",	HB_TAG('C','P','P',' ')},	/* Angolar -> Creoles */
-  {"apa",	HB_TAG('A','T','H',' ')},	/* Apache [family] -> Athapaskan */
+  {"apa",	HB_TAG('A','T','H',' ')},	/* Apache [collection] -> Athapaskan */
   {"apc",	HB_TAG('A','R','A',' ')},	/* North Levantine Arabic -> Arabic */
   {"apd",	HB_TAG('A','R','A',' ')},	/* Sudanese Arabic -> Arabic */
   {"apj",	HB_TAG('A','T','H',' ')},	/* Jicarilla Apache -> Athapaskan */
@@ -86,7 +86,7 @@ static const LangTag ot_languages[] = {
   {"arz",	HB_TAG('A','R','A',' ')},	/* Egyptian Arabic -> Arabic */
   {"as",	HB_TAG('A','S','M',' ')},	/* Assamese */
 /*{"ast",	HB_TAG('A','S','T',' ')},*/	/* Asturian */
-/*{"ath",	HB_TAG('A','T','H',' ')},*/	/* Athapascan [family] -> Athapaskan */
+/*{"ath",	HB_TAG('A','T','H',' ')},*/	/* Athapascan [collection] -> Athapaskan */
   {"atj",	HB_TAG('R','C','R',' ')},	/* Atikamekw -> R-Cree */
   {"atv",	HB_TAG('A','L','T',' ')},	/* Northern Altai -> Altai */
   {"auj",	HB_TAG('B','B','R',' ')},	/* Awjilah -> Berber */
@@ -110,10 +110,10 @@ static const LangTag ot_languages[] = {
   {"azn",	HB_TAG('N','A','H',' ')},	/* Western Durango Nahuatl -> Nahuatl */
   {"azz",	HB_TAG('N','A','H',' ')},	/* Highland Puebla Nahuatl -> Nahuatl */
   {"ba",	HB_TAG('B','S','H',' ')},	/* Bashkir */
-  {"bad",	HB_TAG('B','A','D','0')},	/* Banda [family] */
+  {"bad",	HB_TAG('B','A','D','0')},	/* Banda [collection] */
   {"bag",	HB_TAG_NONE	       },	/* Tuki != Baghelkhandi */
   {"bah",	HB_TAG('C','P','P',' ')},	/* Bahamas Creole English -> Creoles */
-  {"bai",	HB_TAG('B','M','L',' ')},	/* Bamileke [family] */
+  {"bai",	HB_TAG('B','M','L',' ')},	/* Bamileke [collection] */
   {"bal",	HB_TAG('B','L','I',' ')},	/* Baluchi [macrolanguage] */
 /*{"ban",	HB_TAG('B','A','N',' ')},*/	/* Balinese */
 /*{"bar",	HB_TAG('B','A','R',' ')},*/	/* Bavarian */
@@ -135,7 +135,7 @@ static const LangTag ot_languages[] = {
   {"bea",	HB_TAG('A','T','H',' ')},	/* Beaver -> Athapaskan */
   {"beb",	HB_TAG('B','T','I',' ')},	/* Bebele -> Beti */
 /*{"bem",	HB_TAG('B','E','M',' ')},*/	/* Bemba (Zambia) */
-  {"ber",	HB_TAG('B','B','R',' ')},	/* Berber [family] */
+  {"ber",	HB_TAG('B','B','R',' ')},	/* Berber [collection] */
   {"bew",	HB_TAG('C','P','P',' ')},	/* Betawi -> Creoles */
   {"bfl",	HB_TAG('B','A','D','0')},	/* Banda-Ndélé -> Banda */
   {"bfq",	HB_TAG('B','A','D',' ')},	/* Badaga */
@@ -203,7 +203,7 @@ static const LangTag ot_languages[] = {
   {"btd",	HB_TAG('B','T','K',' ')},	/* Batak Dairi -> Batak */
   {"bti",	HB_TAG_NONE	       },	/* Burate != Beti */
   {"btj",	HB_TAG('M','L','Y',' ')},	/* Bacanese Malay -> Malay */
-/*{"btk",	HB_TAG('B','T','K',' ')},*/	/* Batak [family] */
+/*{"btk",	HB_TAG('B','T','K',' ')},*/	/* Batak [collection] */
   {"btm",	HB_TAG('B','T','M',' ')},	/* Batak Mandailing */
   {"btm",	HB_TAG('B','T','K',' ')},	/* Batak Mandailing -> Batak */
   {"bto",	HB_TAG('B','I','K',' ')},	/* Rinconada Bikol -> Bikol */
@@ -256,6 +256,8 @@ static const LangTag ot_languages[] = {
   {"chh",	HB_TAG_NONE	       },	/* Chinook != Chattisgarhi */
   {"chj",	HB_TAG('C','C','H','N')},	/* Ojitlán Chinantec -> Chinantec */
   {"chk",	HB_TAG('C','H','K','0')},	/* Chuukese */
+  {"chm",	HB_TAG('H','M','A',' ')},	/* Mari (Russia) [macrolanguage] -> High Mari */
+  {"chm",	HB_TAG('L','M','A',' ')},	/* Mari (Russia) [macrolanguage] -> Low Mari */
   {"chn",	HB_TAG('C','P','P',' ')},	/* Chinook jargon -> Creoles */
 /*{"cho",	HB_TAG('C','H','O',' ')},*/	/* Choctaw */
   {"chp",	HB_TAG('C','H','P',' ')},	/* Chipewyan */
@@ -297,10 +299,10 @@ static const LangTag ot_languages[] = {
 /*{"cop",	HB_TAG('C','O','P',' ')},*/	/* Coptic */
   {"coq",	HB_TAG('A','T','H',' ')},	/* Coquille -> Athapaskan */
   {"cpa",	HB_TAG('C','C','H','N')},	/* Palantla Chinantec -> Chinantec */
-  {"cpe",	HB_TAG('C','P','P',' ')},	/* English-based creoles and pidgins [family] -> Creoles */
-  {"cpf",	HB_TAG('C','P','P',' ')},	/* French-based creoles and pidgins [family] -> Creoles */
+  {"cpe",	HB_TAG('C','P','P',' ')},	/* English-based creoles and pidgins [collection] -> Creoles */
+  {"cpf",	HB_TAG('C','P','P',' ')},	/* French-based creoles and pidgins [collection] -> Creoles */
   {"cpi",	HB_TAG('C','P','P',' ')},	/* Chinese Pidgin English -> Creoles */
-/*{"cpp",	HB_TAG('C','P','P',' ')},*/	/* Portuguese-based creoles and pidgins [family] -> Creoles */
+/*{"cpp",	HB_TAG('C','P','P',' ')},*/	/* Portuguese-based creoles and pidgins [collection] -> Creoles */
   {"cpx",	HB_TAG('Z','H','S',' ')},	/* Pu-Xian Chinese -> Chinese, Simplified */
   {"cqd",	HB_TAG('H','M','N',' ')},	/* Chuanqiandian Cluster Miao -> Hmong */
   {"cqu",	HB_TAG('Q','U','H',' ')},	/* Chilean Quechua (retired code) -> Quechua (Bolivia) */
@@ -320,7 +322,7 @@ static const LangTag ot_languages[] = {
   {"crm",	HB_TAG('M','C','R',' ')},	/* Moose Cree */
   {"crm",	HB_TAG('L','C','R',' ')},	/* Moose Cree -> L-Cree */
   {"crm",	HB_TAG('C','R','E',' ')},	/* Moose Cree -> Cree */
-  {"crp",	HB_TAG('C','P','P',' ')},	/* Creoles and pidgins [family] -> Creoles */
+  {"crp",	HB_TAG('C','P','P',' ')},	/* Creoles and pidgins [collection] -> Creoles */
   {"crr",	HB_TAG_NONE	       },	/* Carolina Algonquian != Carrier */
   {"crs",	HB_TAG('C','P','P',' ')},	/* Seselwa Creole French -> Creoles */
   {"crt",	HB_TAG_NONE	       },	/* Iyojwa'ja Chorote != Crimean Tatar */
@@ -431,7 +433,7 @@ static const LangTag ot_languages[] = {
   {"et",	HB_TAG('E','T','I',' ')},	/* Estonian [macrolanguage] */
   {"eto",	HB_TAG('B','T','I',' ')},	/* Eton (Cameroon) -> Beti */
   {"eu",	HB_TAG('E','U','Q',' ')},	/* Basque */
-  {"euq",	HB_TAG_NONE	       },	/* Basque [family] != Basque */
+  {"euq",	HB_TAG_NONE	       },	/* Basque [collection] != Basque */
   {"eve",	HB_TAG('E','V','N',' ')},	/* Even */
   {"evn",	HB_TAG('E','V','K',' ')},	/* Evenki */
   {"ewo",	HB_TAG('B','T','I',' ')},	/* Ewondo -> Beti */
@@ -620,10 +622,11 @@ static const LangTag ot_languages[] = {
   {"ijc",	HB_TAG('I','J','O',' ')},	/* Izon -> Ijo */
   {"ije",	HB_TAG('I','J','O',' ')},	/* Biseni -> Ijo */
   {"ijn",	HB_TAG('I','J','O',' ')},	/* Kalabari -> Ijo */
-/*{"ijo",	HB_TAG('I','J','O',' ')},*/	/* Ijo [family] */
+/*{"ijo",	HB_TAG('I','J','O',' ')},*/	/* Ijo [collection] */
   {"ijs",	HB_TAG('I','J','O',' ')},	/* Southeast Ijo -> Ijo */
   {"ik",	HB_TAG('I','P','K',' ')},	/* Inupiaq [macrolanguage] -> Inupiat */
   {"ike",	HB_TAG('I','N','U',' ')},	/* Eastern Canadian Inuktitut -> Inuktitut */
+  {"ike",	HB_TAG('I','N','U','K')},	/* Eastern Canadian Inuktitut -> Nunavik Inuktitut */
   {"ikt",	HB_TAG('I','N','U',' ')},	/* Inuinnaqtun -> Inuktitut */
 /*{"ilo",	HB_TAG('I','L','O',' ')},*/	/* Iloko -> Ilokano */
   {"in",	HB_TAG('I','N','D',' ')},	/* Indonesian (retired code) */
@@ -638,6 +641,7 @@ static const LangTag ot_languages[] = {
   {"it",	HB_TAG('I','T','A',' ')},	/* Italian */
   {"itz",	HB_TAG('M','Y','N',' ')},	/* Itzá -> Mayan */
   {"iu",	HB_TAG('I','N','U',' ')},	/* Inuktitut [macrolanguage] */
+  {"iu",	HB_TAG('I','N','U','K')},	/* Inuktitut [macrolanguage] -> Nunavik Inuktitut */
   {"iw",	HB_TAG('I','W','R',' ')},	/* Hebrew (retired code) */
   {"ixl",	HB_TAG('M','Y','N',' ')},	/* Ixil -> Mayan */
   {"ja",	HB_TAG('J','A','N',' ')},	/* Japanese */
@@ -667,7 +671,7 @@ static const LangTag ot_languages[] = {
   {"kab",	HB_TAG('B','B','R',' ')},	/* Kabyle -> Berber */
   {"kac",	HB_TAG_NONE	       },	/* Kachin != Kachchi */
   {"kam",	HB_TAG('K','M','B',' ')},	/* Kamba (Kenya) */
-  {"kar",	HB_TAG('K','R','N',' ')},	/* Karen [family] */
+  {"kar",	HB_TAG('K','R','N',' ')},	/* Karen [collection] */
 /*{"kaw",	HB_TAG('K','A','W',' ')},*/	/* Kawi (Old Javanese) */
   {"kbd",	HB_TAG('K','A','B',' ')},	/* Kabardian */
   {"kby",	HB_TAG('K','N','R',' ')},	/* Manga Kanuri -> Kanuri */
@@ -876,7 +880,7 @@ static const LangTag ot_languages[] = {
   {"mam",	HB_TAG('M','A','M',' ')},	/* Mam */
   {"mam",	HB_TAG('M','Y','N',' ')},	/* Mam -> Mayan */
   {"man",	HB_TAG('M','N','K',' ')},	/* Mandingo [macrolanguage] -> Maninka */
-  {"map",	HB_TAG_NONE	       },	/* Austronesian [family] != Mapudungun */
+  {"map",	HB_TAG_NONE	       },	/* Austronesian [collection] != Mapudungun */
   {"maw",	HB_TAG_NONE	       },	/* Mampruli != Marwari */
   {"max",	HB_TAG('M','L','Y',' ')},	/* North Moluccan Malay -> Malay */
   {"max",	HB_TAG('C','P','P',' ')},	/* North Moluccan Malay -> Creoles */
@@ -936,6 +940,7 @@ static const LangTag ot_languages[] = {
   {"mnw",	HB_TAG('M','O','N','T')},	/* Mon -> Thailand Mon */
   {"mnx",	HB_TAG_NONE	       },	/* Manikion != Manx */
   {"mo",	HB_TAG('M','O','L',' ')},	/* Moldavian (retired code) */
+  {"mo",	HB_TAG('R','O','M',' ')},	/* Moldavian (retired code) -> Romanian */
   {"mod",	HB_TAG('C','P','P',' ')},	/* Mobilian -> Creoles */
 /*{"moh",	HB_TAG('M','O','H',' ')},*/	/* Mohawk */
   {"mok",	HB_TAG_NONE	       },	/* Morori != Moksha */
@@ -958,7 +963,7 @@ static const LangTag ot_languages[] = {
   {"mts",	HB_TAG_NONE	       },	/* Yora != Maltese */
   {"mud",	HB_TAG('C','P','P',' ')},	/* Mednyj Aleut -> Creoles */
   {"mui",	HB_TAG('M','L','Y',' ')},	/* Musi -> Malay */
-  {"mun",	HB_TAG_NONE	       },	/* Munda [family] != Mundari */
+  {"mun",	HB_TAG_NONE	       },	/* Munda [collection] != Mundari */
   {"mup",	HB_TAG('R','A','J',' ')},	/* Malvi -> Rajasthani */
   {"muq",	HB_TAG('H','M','N',' ')},	/* Eastern Xiangxi Miao -> Hmong */
 /*{"mus",	HB_TAG('M','U','S',' ')},*/	/* Creek -> Muscogee */
@@ -973,7 +978,7 @@ static const LangTag ot_languages[] = {
   {"mww",	HB_TAG('H','M','N',' ')},	/* Hmong Daw -> Hmong */
   {"my",	HB_TAG('B','R','M',' ')},	/* Burmese */
   {"mym",	HB_TAG('M','E','N',' ')},	/* Me’en */
-/*{"myn",	HB_TAG('M','Y','N',' ')},*/	/* Mayan [family] */
+/*{"myn",	HB_TAG('M','Y','N',' ')},*/	/* Mayan [collection] */
   {"myq",	HB_TAG('M','N','K',' ')},	/* Forest Maninka (retired code) -> Maninka */
   {"myv",	HB_TAG('E','R','Z',' ')},	/* Erzya */
   {"mzb",	HB_TAG('B','B','R',' ')},	/* Tumzabt -> Berber */
@@ -982,7 +987,7 @@ static const LangTag ot_languages[] = {
   {"na",	HB_TAG('N','A','U',' ')},	/* Nauru -> Nauruan */
   {"nag",	HB_TAG('N','A','G',' ')},	/* Naga Pidgin -> Naga-Assamese */
   {"nag",	HB_TAG('C','P','P',' ')},	/* Naga Pidgin -> Creoles */
-/*{"nah",	HB_TAG('N','A','H',' ')},*/	/* Nahuatl [family] */
+/*{"nah",	HB_TAG('N','A','H',' ')},*/	/* Nahuatl [collection] */
   {"nan",	HB_TAG('Z','H','S',' ')},	/* Min Nan Chinese -> Chinese, Simplified */
 /*{"nap",	HB_TAG('N','A','P',' ')},*/	/* Neapolitan */
   {"nas",	HB_TAG_NONE	       },	/* Naasioi != Naskapi */
@@ -1039,7 +1044,6 @@ static const LangTag ot_languages[] = {
   {"nln",	HB_TAG('N','A','H',' ')},	/* Durango Nahuatl (retired code) -> Nahuatl */
   {"nlv",	HB_TAG('N','A','H',' ')},	/* Orizaba Nahuatl -> Nahuatl */
   {"nn",	HB_TAG('N','Y','N',' ')},	/* Norwegian Nynorsk (Nynorsk, Norwegian) */
-  {"nn",	HB_TAG('N','O','R',' ')},	/* Norwegian Nynorsk -> Norwegian */
   {"nnh",	HB_TAG('B','M','L',' ')},	/* Ngiemboon -> Bamileke */
   {"nnz",	HB_TAG('B','M','L',' ')},	/* Nda'nda' -> Bamileke */
   {"no",	HB_TAG('N','O','R',' ')},	/* Norwegian [macrolanguage] */
@@ -1093,7 +1097,7 @@ static const LangTag ot_languages[] = {
   {"otw",	HB_TAG('O','J','B',' ')},	/* Ottawa -> Ojibway */
   {"oua",	HB_TAG('B','B','R',' ')},	/* Tagargrent -> Berber */
   {"pa",	HB_TAG('P','A','N',' ')},	/* Punjabi */
-  {"paa",	HB_TAG_NONE	       },	/* Papuan [family] != Palestinian Aramaic */
+  {"paa",	HB_TAG_NONE	       },	/* Papuan [collection] != Palestinian Aramaic */
 /*{"pag",	HB_TAG('P','A','G',' ')},*/	/* Pangasinan */
   {"pal",	HB_TAG_NONE	       },	/* Pahlavi != Pali */
 /*{"pam",	HB_TAG('P','A','M',' ')},*/	/* Pampanga -> Pampangan */
@@ -1308,6 +1312,9 @@ static const LangTag ot_languages[] = {
   {"sgo",	HB_TAG_NONE	       },	/* Songa (retired code) != Sango */
 /*{"sgs",	HB_TAG('S','G','S',' ')},*/	/* Samogitian */
   {"sgw",	HB_TAG('C','H','G',' ')},	/* Sebat Bet Gurage -> Chaha Gurage */
+  {"sh",	HB_TAG('B','O','S',' ')},	/* Serbo-Croatian [macrolanguage] -> Bosnian */
+  {"sh",	HB_TAG('H','R','V',' ')},	/* Serbo-Croatian [macrolanguage] -> Croatian */
+  {"sh",	HB_TAG('S','R','B',' ')},	/* Serbo-Croatian [macrolanguage] -> Serbian */
   {"shi",	HB_TAG('S','H','I',' ')},	/* Tachelhit */
   {"shi",	HB_TAG('B','B','R',' ')},	/* Tachelhit -> Berber */
   {"shl",	HB_TAG('Q','I','N',' ')},	/* Shendu -> Chin */
@@ -1329,7 +1336,7 @@ static const LangTag ot_languages[] = {
   {"skw",	HB_TAG('C','P','P',' ')},	/* Skepi Creole Dutch -> Creoles */
   {"sky",	HB_TAG_NONE	       },	/* Sikaiana != Slovak */
   {"sl",	HB_TAG('S','L','V',' ')},	/* Slovenian */
-  {"sla",	HB_TAG_NONE	       },	/* Slavic [family] != Slavey */
+  {"sla",	HB_TAG_NONE	       },	/* Slavic [collection] != Slavey */
   {"sm",	HB_TAG('S','M','O',' ')},	/* Samoan */
   {"sma",	HB_TAG('S','S','M',' ')},	/* Southern Sami */
   {"smj",	HB_TAG('L','S','M',' ')},	/* Lule Sami */
@@ -1451,7 +1458,7 @@ static const LangTag ot_languages[] = {
   {"tpi",	HB_TAG('C','P','P',' ')},	/* Tok Pisin -> Creoles */
   {"tr",	HB_TAG('T','R','K',' ')},	/* Turkish */
   {"trf",	HB_TAG('C','P','P',' ')},	/* Trinidadian Creole English -> Creoles */
-  {"trk",	HB_TAG_NONE	       },	/* Turkic [family] != Turkish */
+  {"trk",	HB_TAG_NONE	       },	/* Turkic [collection] != Turkish */
   {"tru",	HB_TAG('T','U','A',' ')},	/* Turoyo -> Turoyo Aramaic */
   {"tru",	HB_TAG('S','Y','R',' ')},	/* Turoyo -> Syriac */
   {"ts",	HB_TAG('T','S','G',' ')},	/* Tsonga */
@@ -1593,7 +1600,7 @@ static const LangTag ot_languages[] = {
   {"zlq",	HB_TAG('Z','H','A',' ')},	/* Liuqian Zhuang -> Zhuang */
   {"zmi",	HB_TAG('M','L','Y',' ')},	/* Negeri Sembilan Malay -> Malay */
   {"zmz",	HB_TAG('B','A','D','0')},	/* Mbandja -> Banda */
-  {"znd",	HB_TAG_NONE	       },	/* Zande [family] != Zande */
+  {"znd",	HB_TAG_NONE	       },	/* Zande [collection] != Zande */
   {"zne",	HB_TAG('Z','N','D',' ')},	/* Zande */
   {"zom",	HB_TAG('Q','I','N',' ')},	/* Zou -> Chin */
   {"zqe",	HB_TAG('Z','H','A',' ')},	/* Qiubei Zhuang -> Zhuang */
@@ -2607,14 +2614,8 @@ hb_ot_tags_from_complex_language (const char   *lang_str,
     if (0 == strcmp (&lang_str[1], "o-nyn"))
     {
       /* Norwegian Nynorsk (retired code) */
-      unsigned int i;
-      hb_tag_t possible_tags[] = {
-	HB_TAG('N','Y','N',' '),  /* Norwegian Nynorsk (Nynorsk, Norwegian) */
-	HB_TAG('N','O','R',' '),  /* Norwegian */
-      };
-      for (i = 0; i < 2 && i < *count; i++)
-	tags[i] = possible_tags[i];
-      *count = i;
+      tags[0] = HB_TAG('N','Y','N',' ');  /* Norwegian Nynorsk (Nynorsk, Norwegian) */
+      *count = 1;
       return true;
     }
     break;
@@ -2623,8 +2624,14 @@ hb_ot_tags_from_complex_language (const char   *lang_str,
 	&& subtag_matches (lang_str, limit, "-md"))
     {
       /* Romanian; Moldova */
-      tags[0] = HB_TAG('M','O','L',' ');  /* Moldavian */
-      *count = 1;
+      unsigned int i;
+      hb_tag_t possible_tags[] = {
+	HB_TAG('M','O','L',' '),  /* Moldavian */
+	HB_TAG('R','O','M',' '),  /* Romanian */
+      };
+      for (i = 0; i < 2 && i < *count; i++)
+	tags[i] = possible_tags[i];
+      *count = i;
       return true;
     }
     break;
@@ -2813,15 +2820,15 @@ hb_ot_ambiguous_tag_to_language (hb_tag_t tag)
   case HB_TAG('A','R','K',' '):  /* Rakhine */
     return hb_language_from_string ("rki", -1);  /* Rakhine */
   case HB_TAG('A','T','H',' '):  /* Athapaskan */
-    return hb_language_from_string ("ath", -1);  /* Athapascan [family] */
+    return hb_language_from_string ("ath", -1);  /* Athapascan [collection] */
   case HB_TAG('B','B','R',' '):  /* Berber */
-    return hb_language_from_string ("ber", -1);  /* Berber [family] */
+    return hb_language_from_string ("ber", -1);  /* Berber [collection] */
   case HB_TAG('B','I','K',' '):  /* Bikol */
     return hb_language_from_string ("bik", -1);  /* Bikol [macrolanguage] */
   case HB_TAG('B','T','K',' '):  /* Batak */
-    return hb_language_from_string ("btk", -1);  /* Batak [family] */
+    return hb_language_from_string ("btk", -1);  /* Batak [collection] */
   case HB_TAG('C','P','P',' '):  /* Creoles */
-    return hb_language_from_string ("crp", -1);  /* Creoles and pidgins [family] */
+    return hb_language_from_string ("crp", -1);  /* Creoles and pidgins [collection] */
   case HB_TAG('C','R','R',' '):  /* Carrier */
     return hb_language_from_string ("crx", -1);  /* Carrier */
   case HB_TAG('D','G','R',' '):  /* Dogri (macrolanguage) */
@@ -2838,6 +2845,8 @@ hb_ot_ambiguous_tag_to_language (hb_tag_t tag)
     return hb_language_from_string ("fa", -1);  /* Persian [macrolanguage] */
   case HB_TAG('G','O','N',' '):  /* Gondi */
     return hb_language_from_string ("gon", -1);  /* Gondi [macrolanguage] */
+  case HB_TAG('H','M','A',' '):  /* High Mari */
+    return hb_language_from_string ("mrj", -1);  /* Western Mari */
   case HB_TAG('H','M','N',' '):  /* Hmong */
     return hb_language_from_string ("hmn", -1);  /* Hmong [macrolanguage] */
   case HB_TAG('H','N','D',' '):  /* Hindko */
@@ -2847,7 +2856,7 @@ hb_ot_ambiguous_tag_to_language (hb_tag_t tag)
   case HB_TAG('I','B','A',' '):  /* Iban */
     return hb_language_from_string ("iba", -1);  /* Iban */
   case HB_TAG('I','J','O',' '):  /* Ijo */
-    return hb_language_from_string ("ijo", -1);  /* Ijo [family] */
+    return hb_language_from_string ("ijo", -1);  /* Ijo [collection] */
   case HB_TAG('I','N','U',' '):  /* Inuktitut */
     return hb_language_from_string ("iu", -1);  /* Inuktitut [macrolanguage] */
   case HB_TAG('I','P','K',' '):  /* Inupiat */
@@ -2873,11 +2882,13 @@ hb_ot_ambiguous_tag_to_language (hb_tag_t tag)
   case HB_TAG('K','P','L',' '):  /* Kpelle */
     return hb_language_from_string ("kpe", -1);  /* Kpelle [macrolanguage] */
   case HB_TAG('K','R','N',' '):  /* Karen */
-    return hb_language_from_string ("kar", -1);  /* Karen [family] */
+    return hb_language_from_string ("kar", -1);  /* Karen [collection] */
   case HB_TAG('K','U','I',' '):  /* Kui */
     return hb_language_from_string ("uki", -1);  /* Kui (India) */
   case HB_TAG('K','U','R',' '):  /* Kurdish */
     return hb_language_from_string ("ku", -1);  /* Kurdish [macrolanguage] */
+  case HB_TAG('L','M','A',' '):  /* Low Mari */
+    return hb_language_from_string ("mhr", -1);  /* Eastern Mari */
   case HB_TAG('L','U','H',' '):  /* Luyia */
     return hb_language_from_string ("luy", -1);  /* Luyia [macrolanguage] */
   case HB_TAG('L','V','I',' '):  /* Latvian */
@@ -2897,9 +2908,9 @@ hb_ot_ambiguous_tag_to_language (hb_tag_t tag)
   case HB_TAG('M','O','N','T'):  /* Thailand Mon */
     return hb_language_from_string ("mnw-TH", -1);  /* Mon; Thailand */
   case HB_TAG('M','Y','N',' '):  /* Mayan */
-    return hb_language_from_string ("myn", -1);  /* Mayan [family] */
+    return hb_language_from_string ("myn", -1);  /* Mayan [collection] */
   case HB_TAG('N','A','H',' '):  /* Nahuatl */
-    return hb_language_from_string ("nah", -1);  /* Nahuatl [family] */
+    return hb_language_from_string ("nah", -1);  /* Nahuatl [collection] */
   case HB_TAG('N','E','P',' '):  /* Nepali */
     return hb_language_from_string ("ne", -1);  /* Nepali [macrolanguage] */
   case HB_TAG('N','I','S',' '):  /* Nisi */
@@ -2926,6 +2937,8 @@ hb_ot_ambiguous_tag_to_language (hb_tag_t tag)
     return hb_language_from_string ("qwh", -1);  /* Huaylas Ancash Quechua */
   case HB_TAG('R','A','J',' '):  /* Rajasthani */
     return hb_language_from_string ("raj", -1);  /* Rajasthani [macrolanguage] */
+  case HB_TAG('R','O','M',' '):  /* Romanian */
+    return hb_language_from_string ("ro", -1);  /* Romanian */
   case HB_TAG('R','O','Y',' '):  /* Romany */
     return hb_language_from_string ("rom", -1);  /* Romany [macrolanguage] */
   case HB_TAG('S','Q','I',' '):  /* Albanian */
diff --git a/thirdparty/harfbuzz/src/hb-ot-var-fvar-table.hh b/thirdparty/harfbuzz/src/hb-ot-var-fvar-table.hh
index 05f289db26..e066558683 100644
--- a/thirdparty/harfbuzz/src/hb-ot-var-fvar-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-var-fvar-table.hh
@@ -263,7 +263,7 @@ struct fvar
     if (coords_length && *coords_length)
     {
       hb_array_t<const HBFixed> instanceCoords = instance->get_coordinates (axisCount)
-							 .sub_array (0, *coords_length);
+							 .sub_array (0, coords_length);
       for (unsigned int i = 0; i < instanceCoords.length; i++)
 	coords[i] = instanceCoords.arrayZ[i].to_float ();
     }
diff --git a/thirdparty/harfbuzz/src/hb-ot-var-gvar-table.hh b/thirdparty/harfbuzz/src/hb-ot-var-gvar-table.hh
index 49b5532d40..539213c339 100644
--- a/thirdparty/harfbuzz/src/hb-ot-var-gvar-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-var-gvar-table.hh
@@ -399,7 +399,7 @@ struct gvar
 				  get_offset (glyphCount) - get_offset (0)));
   }
 
-  /* GlyphVariationData not sanitized here; must be checked while accessing each glyph varation data */
+  /* GlyphVariationData not sanitized here; must be checked while accessing each glyph variation data */
   bool sanitize (hb_sanitize_context_t *c) const
   { return sanitize_shallow (c); }
 
@@ -498,9 +498,9 @@ struct gvar
   public:
   struct accelerator_t
   {
-    void init (hb_face_t *face)
+    accelerator_t (hb_face_t *face)
     { table = hb_sanitize_context_t ().reference_table<gvar> (face); }
-    void fini () { table.destroy (); }
+    ~accelerator_t () { table.destroy (); }
 
     private:
     struct x_getter { static float get (const contour_point_t &p) { return p.x; } };
@@ -698,7 +698,9 @@ no_more_gaps:
   DEFINE_SIZE_MIN (20);
 };
 
-struct gvar_accelerator_t : gvar::accelerator_t {};
+struct gvar_accelerator_t : gvar::accelerator_t {
+  gvar_accelerator_t (hb_face_t *face) : gvar::accelerator_t (face) {}
+};
 
 } /* namespace OT */
 
diff --git a/thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh b/thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh
index 074b6a3785..e9d90352f0 100644
--- a/thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh
+++ b/thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh
@@ -177,9 +177,6 @@ struct hvarvvar_subset_plan_t
 
     inner_maps.resize (var_store->get_sub_table_count ());
 
-    for (unsigned int i = 0; i < inner_maps.length; i++)
-      inner_maps[i].init ();
-
     if (unlikely (!index_map_plans.length || !inner_sets.length || !inner_maps.length)) return;
 
     bool retain_adv_map = false;
@@ -229,8 +226,8 @@ struct hvarvvar_subset_plan_t
     for (unsigned int i = 0; i < inner_sets.length; i++)
       hb_set_destroy (inner_sets[i]);
     hb_set_destroy (adv_set);
-    inner_maps.fini_deep ();
-    index_map_plans.fini_deep ();
+    inner_maps.fini ();
+    index_map_plans.fini ();
   }
 
   hb_inc_bimap_t outer_map;
diff --git a/thirdparty/harfbuzz/src/hb-ot-var.cc b/thirdparty/harfbuzz/src/hb-ot-var.cc
index 6b42b45cd9..0376e26b4a 100644
--- a/thirdparty/harfbuzz/src/hb-ot-var.cc
+++ b/thirdparty/harfbuzz/src/hb-ot-var.cc
@@ -303,6 +303,9 @@ hb_ot_var_normalize_variations (hb_face_t            *face,
  * values for the axis are mapped to the interval [-1,1], with the default
  * axis value mapped to 0.
  *
+ * The normalized values have 14 bits of fixed-point sub-integer precision as per
+ * OpenType specification.
+ *
  * Any additional scaling defined in the face's `avar` table is also
  * applied, as described at https://docs.microsoft.com/en-us/typography/opentype/spec/avar
  *
diff --git a/thirdparty/harfbuzz/src/hb-ot-var.h b/thirdparty/harfbuzz/src/hb-ot-var.h
index ce201d3b4f..05147cc25e 100644
--- a/thirdparty/harfbuzz/src/hb-ot-var.h
+++ b/thirdparty/harfbuzz/src/hb-ot-var.h
@@ -109,7 +109,7 @@ typedef enum { /*< flags >*/
  * @tag: The #hb_tag_t tag identifying the design variation of the axis
  * @name_id: The `name` table Name ID that provides display names for the axis
  * @flags: The #hb_ot_var_axis_flags_t flags for the axis
- * @min_value: The mininum value on the variation axis that the font covers
+ * @min_value: The minimum value on the variation axis that the font covers
  * @default_value: The position on the variation axis corresponding to the font's defaults
  * @max_value: The maximum value on the variation axis that the font covers
  * 
diff --git a/thirdparty/harfbuzz/src/hb-repacker.hh b/thirdparty/harfbuzz/src/hb-repacker.hh
index 5c46b4cccc..b1726d8beb 100644
--- a/thirdparty/harfbuzz/src/hb-repacker.hh
+++ b/thirdparty/harfbuzz/src/hb-repacker.hh
@@ -42,26 +42,13 @@ struct graph_t
 {
   struct vertex_t
   {
-    vertex_t () :
-        distance (0),
-        space (0),
-        parents (),
-        start (0),
-        end (0),
-        priority(0) {}
-
-    void fini () {
-      obj.fini ();
-      parents.fini ();
-    }
-
     hb_serialize_context_t::object_t obj;
-    int64_t distance;
-    int64_t space;
+    int64_t distance = 0 ;
+    int64_t space = 0 ;
     hb_vector_t<unsigned> parents;
-    unsigned start;
-    unsigned end;
-    unsigned priority;
+    unsigned start = 0;
+    unsigned end = 0;
+    unsigned priority = 0;
 
     bool is_shared () const
     {
@@ -186,7 +173,7 @@ struct graph_t
 
   ~graph_t ()
   {
-    vertices_.fini_deep ();
+    vertices_.fini ();
   }
 
   bool in_error () const
@@ -309,7 +296,7 @@ struct graph_t
     remap_all_obj_indices (id_map, &sorted_graph);
 
     hb_swap (vertices_, sorted_graph);
-    sorted_graph.fini_deep ();
+    sorted_graph.fini ();
   }
 
   /*
@@ -369,7 +356,7 @@ struct graph_t
     remap_all_obj_indices (id_map, &sorted_graph);
 
     hb_swap (vertices_, sorted_graph);
-    sorted_graph.fini_deep ();
+    sorted_graph.fini ();
   }
 
   /*
@@ -402,11 +389,15 @@ struct graph_t
     while (roots)
     {
       unsigned next = HB_SET_VALUE_INVALID;
+      if (unlikely (!check_success (!roots.in_error ()))) break;
       if (!roots.next (&next)) break;
 
       hb_set_t connected_roots;
       find_connected_nodes (next, roots, visited, connected_roots);
+      if (unlikely (!check_success (!connected_roots.in_error ()))) break;
+
       isolate_subgraph (connected_roots);
+      if (unlikely (!check_success (!connected_roots.in_error ()))) break;
 
       unsigned next_space = this->next_space ();
       num_roots_for_space_.push (0);
@@ -423,6 +414,8 @@ struct graph_t
       //                into the 32 bit space as needed, instead of using isolation.
     }
 
+
+
     return true;
   }
 
@@ -865,7 +858,7 @@ struct graph_t
     // Redundant ones are filtered out later on by the visited set.
     // According to https://www3.cs.stonybrook.edu/~rezaul/papers/TR-07-54.pdf
     // for practical performance this is faster then using a more advanced queue
-    // (such as a fibonaacci queue) with a fast decrease priority.
+    // (such as a fibonacci queue) with a fast decrease priority.
     for (unsigned i = 0; i < vertices_.length; i++)
     {
       if (i == vertices_.length - 1)
@@ -1074,6 +1067,7 @@ struct graph_t
                              hb_set_t& visited,
                              hb_set_t& connected)
   {
+    if (unlikely (!check_success (!visited.in_error ()))) return;
     if (visited.has (start_idx)) return;
     visited.add (start_idx);
 
diff --git a/thirdparty/harfbuzz/src/hb-serialize.hh b/thirdparty/harfbuzz/src/hb-serialize.hh
index 823c0be8b5..6615f033c5 100644
--- a/thirdparty/harfbuzz/src/hb-serialize.hh
+++ b/thirdparty/harfbuzz/src/hb-serialize.hh
@@ -279,7 +279,7 @@ struct hb_serialize_context_t
     object_pool.release (obj);
   }
 
-  /* Set share to false when an object is unlikely sharable with others
+  /* Set share to false when an object is unlikely shareable with others
    * so not worth an attempt, or a contiguous table is serialized as
    * multiple consecutive objects in the reverse order so can't be shared.
    */
@@ -381,7 +381,7 @@ struct hb_serialize_context_t
   // Adding a virtual link from object a to object b will ensure that object b is always packed after
   // object a in the final serialized order.
   //
-  // This is useful in certain situtations where there needs to be a specific ordering in the
+  // This is useful in certain situations where there needs to be a specific ordering in the
   // final serialization. Such as when platform bugs require certain orderings, or to provide
   //  guidance to the repacker for better offset overflow resolution.
   void add_virtual_link (objidx_t objidx)
@@ -510,7 +510,7 @@ struct hb_serialize_context_t
   { return reinterpret_cast<Type *> (this->head); }
   template <typename Type>
   Type *start_embed (const Type &obj) const
-  { return start_embed (hb_addressof (obj)); }
+  { return start_embed (std::addressof (obj)); }
 
   bool err (hb_serialize_error_t err_type)
   {
@@ -548,7 +548,7 @@ struct hb_serialize_context_t
   }
   template <typename Type>
   Type *embed (const Type &obj)
-  { return embed (hb_addressof (obj)); }
+  { return embed (std::addressof (obj)); }
 
   template <typename Type, typename ...Ts> auto
   _copy (const Type &src, hb_priority<1>, Ts&&... ds) HB_RETURN
@@ -595,19 +595,19 @@ struct hb_serialize_context_t
   }
   template <typename Type>
   Type *extend_size (Type &obj, size_t size)
-  { return extend_size (hb_addressof (obj), size); }
+  { return extend_size (std::addressof (obj), size); }
 
   template <typename Type>
   Type *extend_min (Type *obj) { return extend_size (obj, obj->min_size); }
   template <typename Type>
-  Type *extend_min (Type &obj) { return extend_min (hb_addressof (obj)); }
+  Type *extend_min (Type &obj) { return extend_min (std::addressof (obj)); }
 
   template <typename Type, typename ...Ts>
   Type *extend (Type *obj, Ts&&... ds)
   { return extend_size (obj, obj->get_size (std::forward<Ts> (ds)...)); }
   template <typename Type, typename ...Ts>
   Type *extend (Type &obj, Ts&&... ds)
-  { return extend (hb_addressof (obj), std::forward<Ts> (ds)...); }
+  { return extend (std::addressof (obj), std::forward<Ts> (ds)...); }
 
   /* Output routines. */
   hb_bytes_t copy_bytes () const
diff --git a/thirdparty/harfbuzz/src/hb-style.cc b/thirdparty/harfbuzz/src/hb-style.cc
index f1b44cea53..c0c5c4832c 100644
--- a/thirdparty/harfbuzz/src/hb-style.cc
+++ b/thirdparty/harfbuzz/src/hb-style.cc
@@ -48,13 +48,12 @@ _hb_angle_to_ratio (float a)
 {
   return tanf (a * float (M_PI / 180.));
 }
-#if 0
+
 static inline float
 _hb_ratio_to_angle (float r)
 {
   return atanf (r) * float (180. / M_PI);
 }
-#endif
 
 /**
  * hb_style_get_value:
@@ -73,7 +72,8 @@ float
 hb_style_get_value (hb_font_t *font, hb_style_tag_t style_tag)
 {
   if (unlikely (style_tag == HB_STYLE_TAG_SLANT_RATIO))
-    return _hb_angle_to_ratio (hb_style_get_value (font, HB_STYLE_TAG_SLANT_ANGLE));
+    return _hb_angle_to_ratio (hb_style_get_value (font, HB_STYLE_TAG_SLANT_ANGLE))
+	 + font->slant;
 
   hb_face_t *face = font->face;
 
@@ -109,7 +109,14 @@ hb_style_get_value (hb_font_t *font, hb_style_tag_t style_tag)
 	   : 12.f;
   }
   case HB_STYLE_TAG_SLANT_ANGLE:
-    return face->table.post->table->italicAngle.to_float ();
+  {
+    float angle = face->table.post->table->italicAngle.to_float ();
+
+    if (font->slant)
+      angle = _hb_ratio_to_angle (font->slant + _hb_angle_to_ratio (angle));
+
+    return angle;
+  }
   case HB_STYLE_TAG_WIDTH:
     return face->table.OS2->has_data ()
 	   ? face->table.OS2->get_width ()
diff --git a/thirdparty/harfbuzz/src/hb-subset-cff-common.hh b/thirdparty/harfbuzz/src/hb-subset-cff-common.hh
index 7fd96ca86d..18657705fa 100644
--- a/thirdparty/harfbuzz/src/hb-subset-cff-common.hh
+++ b/thirdparty/harfbuzz/src/hb-subset-cff-common.hh
@@ -275,60 +275,36 @@ struct subr_flattener_t
 
 struct subr_closures_t
 {
-  subr_closures_t () : valid (false), global_closure (nullptr)
-  { local_closures.init (); }
-
-  void init (unsigned int fd_count)
+  subr_closures_t (unsigned int fd_count) : valid (false), global_closure (), local_closures ()
   {
     valid = true;
-    global_closure = hb_set_create ();
-    if (global_closure == hb_set_get_empty ())
-      valid = false;
     if (!local_closures.resize (fd_count))
       valid = false;
-
-    for (unsigned int i = 0; i < local_closures.length; i++)
-    {
-      local_closures[i] = hb_set_create ();
-      if (local_closures[i] == hb_set_get_empty ())
-	valid = false;
-    }
-  }
-
-  void fini ()
-  {
-    hb_set_destroy (global_closure);
-    for (unsigned int i = 0; i < local_closures.length; i++)
-      hb_set_destroy (local_closures[i]);
-    local_closures.fini ();
   }
 
   void reset ()
   {
-    hb_set_clear (global_closure);
+    global_closure.clear();
     for (unsigned int i = 0; i < local_closures.length; i++)
-      hb_set_clear (local_closures[i]);
+      local_closures[i].clear();
   }
 
   bool is_valid () const { return valid; }
   bool  valid;
-  hb_set_t  *global_closure;
-  hb_vector_t<hb_set_t *> local_closures;
+  hb_set_t  global_closure;
+  hb_vector_t<hb_set_t> local_closures;
 };
 
 struct parsed_cs_op_t : op_str_t
 {
   void init (unsigned int subr_num_ = 0)
   {
-    op_str_t::init ();
     subr_num = subr_num_;
     drop_flag = false;
     keep_flag = false;
     skip_flag = false;
   }
 
-  void fini () { op_str_t::fini (); }
-
   bool for_drop () const { return drop_flag; }
   void set_drop ()       { if (!for_keep ()) drop_flag = true; }
 
@@ -416,16 +392,6 @@ struct parsed_cs_str_t : parsed_values_t<parsed_cs_op_t>
 
 struct parsed_cs_str_vec_t : hb_vector_t<parsed_cs_str_t>
 {
-  void init (unsigned int len_ = 0)
-  {
-    SUPER::init ();
-    if (unlikely (!resize (len_)))
-      return;
-    for (unsigned int i = 0; i < length; i++)
-      (*this)[i].init ();
-  }
-  void fini () { SUPER::fini_deep (); }
-
   private:
   typedef hb_vector_t<parsed_cs_str_t> SUPER;
 };
@@ -496,7 +462,7 @@ struct subr_subset_param_t
 
 struct subr_remap_t : hb_inc_bimap_t
 {
-  void create (hb_set_t *closure)
+  void create (const hb_set_t *closure)
   {
     /* create a remapping of subroutine numbers from old to new.
      * no optimization based on usage counts. fonttools doesn't appear doing that either.
@@ -526,19 +492,9 @@ struct subr_remap_t : hb_inc_bimap_t
 
 struct subr_remaps_t
 {
-  subr_remaps_t ()
+  subr_remaps_t (unsigned int fdCount)
   {
-    global_remap.init ();
-    local_remaps.init ();
-  }
-
-  ~subr_remaps_t () { fini (); }
-
-  void init (unsigned int fdCount)
-  {
-    if (unlikely (!local_remaps.resize (fdCount))) return;
-    for (unsigned int i = 0; i < fdCount; i++)
-      local_remaps[i].init ();
+    local_remaps.resize (fdCount);
   }
 
   bool in_error()
@@ -548,15 +504,9 @@ struct subr_remaps_t
 
   void create (subr_closures_t& closures)
   {
-    global_remap.create (closures.global_closure);
+    global_remap.create (&closures.global_closure);
     for (unsigned int i = 0; i < local_remaps.length; i++)
-      local_remaps[i].create (closures.local_closures[i]);
-  }
-
-  void fini ()
-  {
-    global_remap.fini ();
-    local_remaps.fini_deep ();
+      local_remaps[i].create (&closures.local_closures[i]);
   }
 
   subr_remap_t	       global_remap;
@@ -567,21 +517,8 @@ template <typename SUBSETTER, typename SUBRS, typename ACC, typename ENV, typena
 struct subr_subsetter_t
 {
   subr_subsetter_t (ACC &acc_, const hb_subset_plan_t *plan_)
-    : acc (acc_), plan (plan_)
-  {
-    parsed_charstrings.init ();
-    parsed_global_subrs.init ();
-    parsed_local_subrs.init ();
-  }
-
-  ~subr_subsetter_t ()
-  {
-    closures.fini ();
-    remaps.fini ();
-    parsed_charstrings.fini_deep ();
-    parsed_global_subrs.fini_deep ();
-    parsed_local_subrs.fini_deep ();
-  }
+      : acc (acc_), plan (plan_), closures(acc_.fdCount), remaps(acc_.fdCount)
+  {}
 
   /* Subroutine subsetting with --no-desubroutinize runs in phases:
    *
@@ -599,11 +536,8 @@ struct subr_subsetter_t
    */
   bool subset (void)
   {
-    closures.init (acc.fdCount);
-    remaps.init (acc.fdCount);
-
-    parsed_charstrings.init (plan->num_output_glyphs ());
-    parsed_global_subrs.init (acc.globalSubrs->count);
+    parsed_charstrings.resize (plan->num_output_glyphs ());
+    parsed_global_subrs.resize (acc.globalSubrs->count);
 
     if (unlikely (remaps.in_error()
                   || parsed_charstrings.in_error ()
@@ -615,7 +549,7 @@ struct subr_subsetter_t
 
     for (unsigned int i = 0; i < acc.fdCount; i++)
     {
-      parsed_local_subrs[i].init (acc.privateDicts[i].localSubrs->count);
+      parsed_local_subrs[i].resize (acc.privateDicts[i].localSubrs->count);
       if (unlikely (parsed_local_subrs[i].in_error ())) return false;
     }
     if (unlikely (!closures.valid))
@@ -638,7 +572,7 @@ struct subr_subsetter_t
       subr_subset_param_t  param;
       param.init (&parsed_charstrings[i],
 		  &parsed_global_subrs,  &parsed_local_subrs[fd],
-		  closures.global_closure, closures.local_closures[fd],
+		  &closures.global_closure, &closures.local_closures[fd],
 		  plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
 
       if (unlikely (!interp.interpret (param)))
@@ -662,7 +596,7 @@ struct subr_subsetter_t
 	subr_subset_param_t  param;
 	param.init (&parsed_charstrings[i],
 		    &parsed_global_subrs,  &parsed_local_subrs[fd],
-		    closures.global_closure, closures.local_closures[fd],
+		    &closures.global_closure, &closures.local_closures[fd],
                     plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
 
 	drop_hints_param_t  drop;
@@ -687,7 +621,7 @@ struct subr_subsetter_t
 	subr_subset_param_t  param;
 	param.init (&parsed_charstrings[i],
 		    &parsed_global_subrs,  &parsed_local_subrs[fd],
-		    closures.global_closure, closures.local_closures[fd],
+		    &closures.global_closure, &closures.local_closures[fd],
                     plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
 	collect_subr_refs_in_str (parsed_charstrings[i], param);
       }
diff --git a/thirdparty/harfbuzz/src/hb-subset-cff1.cc b/thirdparty/harfbuzz/src/hb-subset-cff1.cc
index b4e24122c9..35fecd67bc 100644
--- a/thirdparty/harfbuzz/src/hb-subset-cff1.cc
+++ b/thirdparty/harfbuzz/src/hb-subset-cff1.cc
@@ -362,43 +362,11 @@ struct cff1_subr_subsetter_t : subr_subsetter_t<cff1_subr_subsetter_t, CFF1Subrs
 
 struct cff_subset_plan {
   cff_subset_plan ()
-    : info (),
-      orig_fdcount (0),
-      subset_fdcount (1),
-      subset_fdselect_format (0),
-      drop_hints (false),
-      desubroutinize(false)
   {
-    topdict_mod.init ();
-    subset_fdselect_ranges.init ();
-    fdmap.init ();
-    subset_charstrings.init ();
-    subset_globalsubrs.init ();
-    subset_localsubrs.init ();
-    fontdicts_mod.init ();
-    subset_enc_code_ranges.init ();
-    subset_enc_supp_codes.init ();
-    subset_charset_ranges.init ();
-    sidmap.init ();
     for (unsigned int i = 0; i < name_dict_values_t::ValCount; i++)
       topDictModSIDs[i] = CFF_UNDEF_SID;
   }
 
-  ~cff_subset_plan ()
-  {
-    topdict_mod.fini ();
-    subset_fdselect_ranges.fini ();
-    fdmap.fini ();
-    subset_charstrings.fini_deep ();
-    subset_globalsubrs.fini_deep ();
-    subset_localsubrs.fini_deep ();
-    fontdicts_mod.fini ();
-    subset_enc_code_ranges.fini ();
-    subset_enc_supp_codes.fini ();
-    subset_charset_ranges.fini ();
-    sidmap.fini ();
-  }
-
   void plan_subset_encoding (const OT::cff1::accelerator_subset_t &acc, hb_subset_plan_t *plan)
   {
     const Encoding *encoding = acc.encoding;
@@ -672,9 +640,9 @@ struct cff_subset_plan {
   cff1_sub_table_info_t		info;
 
   unsigned int    num_glyphs;
-  unsigned int    orig_fdcount;
-  unsigned int    subset_fdcount;
-  unsigned int    subset_fdselect_format;
+  unsigned int    orig_fdcount = 0;
+  unsigned int    subset_fdcount = 1;
+  unsigned int    subset_fdselect_format = 0;
   hb_vector_t<code_pair_t>   subset_fdselect_ranges;
 
   /* font dict index remap table from fullset FDArray to subset FDArray.
@@ -686,7 +654,7 @@ struct cff_subset_plan {
   hb_vector_t<str_buff_vec_t>	subset_localsubrs;
   hb_vector_t<cff1_font_dict_values_mod_t>  fontdicts_mod;
 
-  bool		drop_hints;
+  bool		drop_hints = false;
 
   bool		gid_renum;
   bool		subset_encoding;
@@ -702,7 +670,7 @@ struct cff_subset_plan {
   remap_sid_t	sidmap;
   unsigned int	topDictModSIDs[name_dict_values_t::ValCount];
 
-  bool		desubroutinize;
+  bool		desubroutinize = false;
 };
 
 static bool _serialize_cff1 (hb_serialize_context_t *c,
diff --git a/thirdparty/harfbuzz/src/hb-subset-cff2.cc b/thirdparty/harfbuzz/src/hb-subset-cff2.cc
index 896ae64016..92dd6b1d2c 100644
--- a/thirdparty/harfbuzz/src/hb-subset-cff2.cc
+++ b/thirdparty/harfbuzz/src/hb-subset-cff2.cc
@@ -233,29 +233,6 @@ struct cff2_subr_subsetter_t : subr_subsetter_t<cff2_subr_subsetter_t, CFF2Subrs
 };
 
 struct cff2_subset_plan {
-  cff2_subset_plan ()
-    : orig_fdcount (0),
-      subset_fdcount(1),
-      subset_fdselect_size (0),
-      subset_fdselect_format (0),
-      drop_hints (false),
-      desubroutinize (false)
-  {
-    subset_fdselect_ranges.init ();
-    fdmap.init ();
-    subset_charstrings.init ();
-    subset_globalsubrs.init ();
-    subset_localsubrs.init ();
-  }
-
-  ~cff2_subset_plan ()
-  {
-    subset_fdselect_ranges.fini ();
-    fdmap.fini ();
-    subset_charstrings.fini_deep ();
-    subset_globalsubrs.fini_deep ();
-    subset_localsubrs.fini_deep ();
-  }
 
   bool create (const OT::cff2::accelerator_subset_t &acc,
 	      hb_subset_plan_t *plan)
@@ -320,10 +297,10 @@ struct cff2_subset_plan {
 
   cff2_sub_table_info_t info;
 
-  unsigned int    orig_fdcount;
-  unsigned int    subset_fdcount;
-  unsigned int	  subset_fdselect_size;
-  unsigned int    subset_fdselect_format;
+  unsigned int    orig_fdcount = 0;
+  unsigned int    subset_fdcount = 1;
+  unsigned int	  subset_fdselect_size = 0;
+  unsigned int    subset_fdselect_format = 0;
   hb_vector_t<code_pair_t>   subset_fdselect_ranges;
 
   hb_inc_bimap_t   fdmap;
@@ -332,8 +309,8 @@ struct cff2_subset_plan {
   str_buff_vec_t	    subset_globalsubrs;
   hb_vector_t<str_buff_vec_t> subset_localsubrs;
 
-  bool	    drop_hints;
-  bool	    desubroutinize;
+  bool	    drop_hints = false;
+  bool	    desubroutinize = false;
 };
 
 static bool _serialize_cff2 (hb_serialize_context_t *c,
@@ -473,12 +450,8 @@ _hb_subset_cff2 (const OT::cff2::accelerator_subset_t  &acc,
 bool
 hb_subset_cff2 (hb_subset_context_t *c)
 {
-  OT::cff2::accelerator_subset_t acc;
-  acc.init (c->plan->source);
-  bool result = likely (acc.is_valid ()) && _hb_subset_cff2 (acc, c);
-  acc.fini ();
-
-  return result;
+  OT::cff2::accelerator_subset_t acc (c->plan->source);
+  return acc.is_valid () && _hb_subset_cff2 (acc, c);
 }
 
 #endif
diff --git a/thirdparty/harfbuzz/src/hb-subset-plan.cc b/thirdparty/harfbuzz/src/hb-subset-plan.cc
index 883ab82093..af4fcb8137 100644
--- a/thirdparty/harfbuzz/src/hb-subset-plan.cc
+++ b/thirdparty/harfbuzz/src/hb-subset-plan.cc
@@ -228,10 +228,8 @@ _cmap_closure (hb_face_t	   *face,
 	       const hb_set_t	   *unicodes,
 	       hb_set_t		   *glyphset)
 {
-  OT::cmap::accelerator_t cmap;
-  cmap.init (face);
+  OT::cmap::accelerator_t cmap (face);
   cmap.table->closure_glyphs (unicodes, glyphset);
-  cmap.fini ();
 }
 
 static void _colr_closure (hb_face_t *face,
@@ -239,8 +237,7 @@ static void _colr_closure (hb_face_t *face,
                            hb_map_t *palettes_map,
                            hb_set_t *glyphs_colred)
 {
-  OT::COLR::accelerator_t colr;
-  colr.init (face);
+  OT::COLR::accelerator_t colr (face);
   if (!colr.is_valid ()) return;
 
   unsigned iteration_count = 0;
@@ -263,7 +260,6 @@ static void _colr_closure (hb_face_t *face,
   colr.closure_V0palette_indices (glyphs_colred, &palette_indices);
   _remap_indexes (&layer_indices, layers_map);
   _remap_palette_indexes (&palette_indices, palettes_map);
-  colr.fini ();
 }
 
 static inline void
@@ -294,8 +290,7 @@ _populate_unicodes_to_retain (const hb_set_t *unicodes,
                               const hb_set_t *glyphs,
                               hb_subset_plan_t *plan)
 {
-  OT::cmap::accelerator_t cmap;
-  cmap.init (plan->source);
+  OT::cmap::accelerator_t cmap (plan->source);
 
   constexpr static const int size_threshold = 4096;
 
@@ -343,8 +338,6 @@ _populate_unicodes_to_retain (const hb_set_t *unicodes,
 
   + plan->codepoint_to_glyph->keys ()   | hb_sink (plan->unicodes);
   + plan->codepoint_to_glyph->values () | hb_sink (plan->_glyphset_gsub);
-
-  cmap.fini ();
 }
 
 static void
@@ -353,13 +346,9 @@ _populate_gids_to_retain (hb_subset_plan_t* plan,
 			  bool close_over_gpos,
 			  bool close_over_gdef)
 {
-  OT::glyf::accelerator_t glyf;
-#ifndef HB_NO_SUBSET_CFF
-  OT::cff1::accelerator_t cff;
-#endif
-  glyf.init (plan->source);
+  OT::glyf::accelerator_t glyf (plan->source);
 #ifndef HB_NO_SUBSET_CFF
-  cff.init (plan->source);
+  OT::cff1::accelerator_t cff (plan->source);
 #endif
 
   plan->_glyphset_gsub->add (0); // Not-def
@@ -419,11 +408,6 @@ _populate_gids_to_retain (hb_subset_plan_t* plan,
 				       plan->layout_variation_indices,
 				       plan->layout_variation_idx_map);
 #endif
-
-#ifndef HB_NO_SUBSET_CFF
-  cff.fini ();
-#endif
-  glyf.fini ();
 }
 
 static void
diff --git a/thirdparty/harfbuzz/src/hb-uniscribe.cc b/thirdparty/harfbuzz/src/hb-uniscribe.cc
index 0e5a114f7d..50f71ce9ce 100644
--- a/thirdparty/harfbuzz/src/hb-uniscribe.cc
+++ b/thirdparty/harfbuzz/src/hb-uniscribe.cc
@@ -878,7 +878,8 @@ retry:
   if (backward)
     hb_buffer_reverse (buffer);
 
-  buffer->clear_glyph_flags (HB_GLYPH_FLAG_UNSAFE_TO_BREAK);
+  buffer->clear_glyph_flags ();
+  buffer->unsafe_to_break ();
 
   /* Wow, done! */
   return true;
diff --git a/thirdparty/harfbuzz/src/hb-vector.hh b/thirdparty/harfbuzz/src/hb-vector.hh
index b0a1e5e966..6c7d32e49d 100644
--- a/thirdparty/harfbuzz/src/hb-vector.hh
+++ b/thirdparty/harfbuzz/src/hb-vector.hh
@@ -32,11 +32,14 @@
 #include "hb-null.hh"
 
 
-template <typename Type>
-struct hb_vector_t
+template <typename Type,
+	  bool sorted=false>
+struct hb_vector_t : std::conditional<sorted, hb_vector_t<Type, false>, hb_empty_t>::type
 {
   typedef Type item_t;
   static constexpr unsigned item_size = hb_static_size (Type);
+  using array_t = typename std::conditional<sorted, hb_sorted_array_t<Type>, hb_array_t<Type>>::type;
+  using c_array_t = typename std::conditional<sorted, hb_sorted_array_t<const Type>, hb_array_t<const Type>>::type;
 
   hb_vector_t () = default;
   hb_vector_t (std::initializer_list<Type> lst) : hb_vector_t ()
@@ -82,16 +85,10 @@ struct hb_vector_t
 
   void fini ()
   {
+    shrink_vector (0);
     hb_free (arrayZ);
     init ();
   }
-  void fini_deep ()
-  {
-    unsigned int count = length;
-    for (unsigned int i = 0; i < count; i++)
-      arrayZ[i].fini ();
-    fini ();
-  }
 
   void reset ()
   {
@@ -152,24 +149,24 @@ struct hb_vector_t
   template <typename T>
   hb_vector_t& operator << (T&& v) { push (std::forward<T> (v)); return *this; }
 
-  hb_array_t<      Type> as_array ()       { return hb_array (arrayZ, length); }
-  hb_array_t<const Type> as_array () const { return hb_array (arrayZ, length); }
+  array_t   as_array ()       { return hb_array (arrayZ, length); }
+  c_array_t as_array () const { return hb_array (arrayZ, length); }
 
   /* Iterator. */
-  typedef hb_array_t<const Type>   iter_t;
-  typedef hb_array_t<      Type> writer_t;
+  typedef c_array_t   iter_t;
+  typedef array_t   writer_t;
     iter_t   iter () const { return as_array (); }
   writer_t writer ()       { return as_array (); }
   operator   iter_t () const { return   iter (); }
   operator writer_t ()       { return writer (); }
 
-  hb_array_t<const Type> sub_array (unsigned int start_offset, unsigned int count) const
+  c_array_t sub_array (unsigned int start_offset, unsigned int count) const
   { return as_array ().sub_array (start_offset, count); }
-  hb_array_t<const Type> sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */) const
+  c_array_t sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */) const
   { return as_array ().sub_array (start_offset, count); }
-  hb_array_t<Type> sub_array (unsigned int start_offset, unsigned int count)
+  array_t sub_array (unsigned int start_offset, unsigned int count)
   { return as_array ().sub_array (start_offset, count); }
-  hb_array_t<Type> sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */)
+  array_t sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */)
   { return as_array ().sub_array (start_offset, count); }
 
   hb_sorted_array_t<Type> as_sorted_array ()
@@ -192,6 +189,7 @@ struct hb_vector_t
   template <typename T>
   Type *push (T&& v)
   {
+    /* TODO Emplace? */
     Type *p = push ();
     if (p == &Crap (Type))
       // If push failed to allocate then don't copy v, since this may cause
@@ -204,6 +202,92 @@ struct hb_vector_t
 
   bool in_error () const { return allocated < 0; }
 
+  template <typename T = Type,
+	    hb_enable_if (std::is_trivially_copy_assignable<T>::value)>
+  Type *
+  realloc_vector (unsigned new_allocated)
+  {
+    return (Type *) hb_realloc (arrayZ, new_allocated * sizeof (Type));
+  }
+  template <typename T = Type,
+	    hb_enable_if (!std::is_trivially_copy_assignable<T>::value)>
+  Type *
+  realloc_vector (unsigned new_allocated)
+  {
+    Type *new_array = (Type *) hb_malloc (new_allocated * sizeof (Type));
+    if (likely (new_array))
+    {
+      for (unsigned i = 0; i < length; i++)
+	new (std::addressof (new_array[i])) Type ();
+      for (unsigned i = 0; i < (unsigned) length; i++)
+	new_array[i] = std::move (arrayZ[i]);
+      unsigned old_length = length;
+      shrink_vector (0);
+      length = old_length;
+      hb_free (arrayZ);
+    }
+    return new_array;
+  }
+
+  template <typename T = Type,
+	    hb_enable_if (std::is_trivially_constructible<T>::value ||
+			  !std::is_default_constructible<T>::value)>
+  void
+  grow_vector (unsigned size)
+  {
+    memset (arrayZ + length, 0, (size - length) * sizeof (*arrayZ));
+    length = size;
+  }
+  template <typename T = Type,
+	    hb_enable_if (!std::is_trivially_constructible<T>::value &&
+			   std::is_default_constructible<T>::value)>
+  void
+  grow_vector (unsigned size)
+  {
+    while (length < size)
+    {
+      length++;
+      new (std::addressof (arrayZ[length - 1])) Type ();
+    }
+  }
+
+  template <typename T = Type,
+	    hb_enable_if (std::is_trivially_destructible<T>::value)>
+  void
+  shrink_vector (unsigned size)
+  {
+    length = size;
+  }
+  template <typename T = Type,
+	    hb_enable_if (!std::is_trivially_destructible<T>::value)>
+  void
+  shrink_vector (unsigned size)
+  {
+    while ((unsigned) length > size)
+    {
+      arrayZ[(unsigned) length - 1].~Type ();
+      length--;
+    }
+  }
+
+  template <typename T = Type,
+	    hb_enable_if (std::is_trivially_copy_assignable<T>::value)>
+  void
+  shift_down_vector (unsigned i)
+  {
+    memmove (static_cast<void *> (&arrayZ[i - 1]),
+	     static_cast<void *> (&arrayZ[i]),
+	     (length - i) * sizeof (Type));
+  }
+  template <typename T = Type,
+	    hb_enable_if (!std::is_trivially_copy_assignable<T>::value)>
+  void
+  shift_down_vector (unsigned i)
+  {
+    for (; i < length; i++)
+      arrayZ[i - 1] = std::move (arrayZ[i]);
+  }
+
   /* Allocate for size but don't adjust length. */
   bool alloc (unsigned int size)
   {
@@ -225,7 +309,7 @@ struct hb_vector_t
       (new_allocated < (unsigned) allocated) ||
       hb_unsigned_mul_overflows (new_allocated, sizeof (Type));
     if (likely (!overflows))
-      new_array = (Type *) hb_realloc (arrayZ, new_allocated * sizeof (Type));
+      new_array = realloc_vector (new_allocated);
 
     if (unlikely (!new_array))
     {
@@ -246,7 +330,9 @@ struct hb_vector_t
       return false;
 
     if (size > length)
-      memset (arrayZ + length, 0, (size - length) * sizeof (*arrayZ));
+      grow_vector (size);
+    else if (size < length)
+      shrink_vector (size);
 
     length = size;
     return true;
@@ -255,48 +341,38 @@ struct hb_vector_t
   Type pop ()
   {
     if (!length) return Null (Type);
-    return std::move (arrayZ[--length]); /* Does this move actually work? */
+    Type v = std::move (arrayZ[length - 1]);
+    arrayZ[length - 1].~Type ();
+    length--;
+    return v;
   }
 
   void remove (unsigned int i)
   {
     if (unlikely (i >= length))
       return;
-    memmove (static_cast<void *> (&arrayZ[i]),
-	     static_cast<void *> (&arrayZ[i + 1]),
-	     (length - i - 1) * sizeof (Type));
+    arrayZ[i].~Type ();
+    shift_down_vector (i + 1);
     length--;
   }
 
   void shrink (int size_)
   {
     unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
-     if (size < length)
-       length = size;
-  }
+    if (size >= length)
+      return;
 
-  template <typename T>
-  Type *find (T v)
-  {
-    for (unsigned int i = 0; i < length; i++)
-      if (arrayZ[i] == v)
-	return &arrayZ[i];
-    return nullptr;
-  }
-  template <typename T>
-  const Type *find (T v) const
-  {
-    for (unsigned int i = 0; i < length; i++)
-      if (arrayZ[i] == v)
-	return &arrayZ[i];
-    return nullptr;
+    shrink_vector (size);
   }
 
+
+  /* Sorting API. */
   void qsort (int (*cmp)(const void*, const void*))
   { as_array ().qsort (cmp); }
   void qsort (unsigned int start = 0, unsigned int end = (unsigned int) -1)
   { as_array ().qsort (start, end); }
 
+  /* Unsorted search API. */
   template <typename T>
   Type *lsearch (const T &x, Type *not_found = nullptr)
   { return as_array ().lsearch (x, not_found); }
@@ -306,47 +382,25 @@ struct hb_vector_t
   template <typename T>
   bool lfind (const T &x, unsigned *pos = nullptr) const
   { return as_array ().lfind (x, pos); }
-};
 
-template <typename Type>
-struct hb_sorted_vector_t : hb_vector_t<Type>
-{
-  hb_sorted_vector_t () = default;
-  ~hb_sorted_vector_t () = default;
-  hb_sorted_vector_t (hb_sorted_vector_t& o) = default;
-  hb_sorted_vector_t (hb_sorted_vector_t &&o) = default;
-  hb_sorted_vector_t (std::initializer_list<Type> lst) : hb_vector_t<Type> (lst) {}
-  template <typename Iterable,
-	    hb_requires (hb_is_iterable (Iterable))>
-  hb_sorted_vector_t (const Iterable &o) : hb_vector_t<Type> (o) {}
-  hb_sorted_vector_t& operator = (const hb_sorted_vector_t &o) = default;
-  hb_sorted_vector_t& operator = (hb_sorted_vector_t &&o) = default;
-  friend void swap (hb_sorted_vector_t& a, hb_sorted_vector_t& b)
-  { hb_swap ((hb_vector_t<Type>&) (a), (hb_vector_t<Type>&) (b)); }
-
-  hb_sorted_array_t<      Type> as_array ()       { return hb_sorted_array (this->arrayZ, this->length); }
-  hb_sorted_array_t<const Type> as_array () const { return hb_sorted_array (this->arrayZ, this->length); }
-
-  /* Iterator. */
-  typedef hb_sorted_array_t<const Type> const_iter_t;
-  typedef hb_sorted_array_t<      Type>       iter_t;
-  const_iter_t  iter () const { return as_array (); }
-  const_iter_t citer () const { return as_array (); }
-	iter_t  iter ()       { return as_array (); }
-  operator       iter_t ()       { return iter (); }
-  operator const_iter_t () const { return iter (); }
-
-  template <typename T>
+  /* Sorted search API. */
+  template <typename T,
+	    bool Sorted=sorted, hb_enable_if (Sorted)>
   Type *bsearch (const T &x, Type *not_found = nullptr)
   { return as_array ().bsearch (x, not_found); }
-  template <typename T>
+  template <typename T,
+	    bool Sorted=sorted, hb_enable_if (Sorted)>
   const Type *bsearch (const T &x, const Type *not_found = nullptr) const
   { return as_array ().bsearch (x, not_found); }
-  template <typename T>
+  template <typename T,
+	    bool Sorted=sorted, hb_enable_if (Sorted)>
   bool bfind (const T &x, unsigned int *i = nullptr,
 	      hb_not_found_t not_found = HB_NOT_FOUND_DONT_STORE,
 	      unsigned int to_store = (unsigned int) -1) const
   { return as_array ().bfind (x, i, not_found, to_store); }
 };
 
+template <typename Type>
+using hb_sorted_vector_t = hb_vector_t<Type, true>;
+
 #endif /* HB_VECTOR_HH */
diff --git a/thirdparty/harfbuzz/src/hb-version.h b/thirdparty/harfbuzz/src/hb-version.h
index 52b124b745..91ccb3dcde 100644
--- a/thirdparty/harfbuzz/src/hb-version.h
+++ b/thirdparty/harfbuzz/src/hb-version.h
@@ -47,20 +47,20 @@ HB_BEGIN_DECLS
  *
  * The minor component of the library version available at compile-time.
  */
-#define HB_VERSION_MINOR 2
+#define HB_VERSION_MINOR 3
 /**
  * HB_VERSION_MICRO:
  *
  * The micro component of the library version available at compile-time.
  */
-#define HB_VERSION_MICRO 0
+#define HB_VERSION_MICRO 1
 
 /**
  * HB_VERSION_STRING:
  *
  * A string literal containing the library version available at compile-time.
  */
-#define HB_VERSION_STRING "3.2.0"
+#define HB_VERSION_STRING "3.3.1"
 
 /**
  * HB_VERSION_ATLEAST: