1 files changed, 61 insertions, 26 deletions

diff --git a/thirdparty/harfbuzz/src/hb-buffer.hh b/thirdparty/harfbuzz/src/hb-buffer.hh
index 8635ebd35f..0f8140f1b3 100644
--- a/thirdparty/harfbuzz/src/hb-buffer.hh
+++ b/thirdparty/harfbuzz/src/hb-buffer.hh
@@ -93,6 +93,7 @@ struct hb_buffer_t
   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. */
@@ -200,9 +201,55 @@ struct hb_buffer_t
 			unsigned int    cluster);
   HB_INTERNAL void add_info (const hb_glyph_info_t &glyph_info);
 
-  HB_INTERNAL void reverse_range (unsigned int start, unsigned int end);
-  HB_INTERNAL void reverse ();
-  HB_INTERNAL void reverse_clusters ();
+  void reverse_range (unsigned start, unsigned end)
+  {
+    hb_array_t<hb_glyph_info_t> (info, len).reverse (start, end);
+    if (have_positions)
+      hb_array_t<hb_glyph_position_t> (pos, len).reverse (start, end);
+  }
+  void reverse () { reverse_range (0, len); }
+
+  template <typename FuncType>
+  void reverse_groups (const FuncType& group,
+		       bool merge_clusters = false)
+  {
+    if (unlikely (!len))
+      return;
+
+    unsigned start = 0;
+    unsigned i;
+    for (i = 1; i < len; i++)
+    {
+      if (!group (info[i - 1], info[i]))
+      {
+	if (merge_clusters)
+	  this->merge_clusters (start, i);
+	reverse_range (start, i);
+	start = i;
+      }
+    }
+    if (merge_clusters)
+      this->merge_clusters (start, i);
+    reverse_range (start, i);
+
+    reverse ();
+  }
+
+  template <typename FuncType>
+  unsigned group_end (unsigned start, const FuncType& group) const
+  {
+    while (++start < len && group (info[start - 1], info[start]))
+      ;
+
+    return start;
+  }
+
+  static bool _cluster_group_func (const hb_glyph_info_t& a,
+				   const hb_glyph_info_t& b)
+  { return a.cluster == b.cluster; }
+
+  void reverse_clusters () { reverse_groups (_cluster_group_func); }
+
   HB_INTERNAL void guess_segment_properties ();
 
   HB_INTERNAL void swap_buffers ();
@@ -427,10 +474,10 @@ struct hb_buffer_t
     inf.cluster = cluster;
   }
 
-  unsigned int
-  _unsafe_to_break_find_min_cluster (const hb_glyph_info_t *infos,
-				     unsigned int start, unsigned int end,
-				     unsigned int cluster) const
+  static unsigned
+  _infos_find_min_cluster (const hb_glyph_info_t *infos,
+			   unsigned start, unsigned end,
+			   unsigned cluster)
   {
     for (unsigned int i = start; i < end; i++)
       cluster = hb_min (cluster, infos[i].cluster);
@@ -449,36 +496,24 @@ struct hb_buffer_t
       }
   }
 
-  void unsafe_to_break_all () { unsafe_to_break_impl (0, len); }
-  void safe_to_break_all ()
+  void clear_glyph_flags (hb_mask_t mask = 0)
   {
     for (unsigned int i = 0; i < len; i++)
-      info[i].mask &= ~HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
+      info[i].mask = (info[i].mask & ~HB_GLYPH_FLAG_DEFINED) | (mask & HB_GLYPH_FLAG_DEFINED);
   }
 };
 DECLARE_NULL_INSTANCE (hb_buffer_t);
 
 
-/* Loop over clusters. Duplicated in foreach_syllable(). */
-#define foreach_cluster(buffer, start, end) \
+#define foreach_group(buffer, start, end, group_func) \
   for (unsigned int \
        _count = buffer->len, \
-       start = 0, end = _count ? _next_cluster (buffer, 0) : 0; \
+       start = 0, end = _count ? buffer->group_end (0, group_func) : 0; \
        start < _count; \
-       start = end, end = _next_cluster (buffer, start))
-
-static inline unsigned int
-_next_cluster (hb_buffer_t *buffer, unsigned int start)
-{
-  hb_glyph_info_t *info = buffer->info;
-  unsigned int count = buffer->len;
-
-  unsigned int cluster = info[start].cluster;
-  while (++start < count && cluster == info[start].cluster)
-    ;
+       start = end, end = buffer->group_end (start, group_func))
 
-  return start;
-}
+#define foreach_cluster(buffer, start, end) \
+	foreach_group (buffer, start, end, hb_buffer_t::_cluster_group_func)
 
 
 #define HB_BUFFER_XALLOCATE_VAR(b, func, var) \