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diff --git a/gfx/harfbuzz/src/OT/Layout/Common/Coverage.hh b/gfx/harfbuzz/src/OT/Layout/Common/Coverage.hh
new file mode 100644
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--- /dev/null
+++ b/gfx/harfbuzz/src/OT/Layout/Common/Coverage.hh
@@ -0,0 +1,336 @@
+/*
+ * Copyright © 2007,2008,2009  Red Hat, Inc.
+ * Copyright © 2010,2012  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod, Garret Rieger
+ */
+
+#ifndef OT_LAYOUT_COMMON_COVERAGE_HH
+#define OT_LAYOUT_COMMON_COVERAGE_HH
+
+#include "../types.hh"
+#include "CoverageFormat1.hh"
+#include "CoverageFormat2.hh"
+
+namespace OT {
+namespace Layout {
+namespace Common {
+
+template<typename Iterator>
+static inline void Coverage_serialize (hb_serialize_context_t *c,
+                                       Iterator it);
+
+struct Coverage
+{
+
+  protected:
+  union {
+  HBUINT16                      format;         /* Format identifier */
+  CoverageFormat1_3<SmallTypes> format1;
+  CoverageFormat2_4<SmallTypes> format2;
+#ifndef HB_NO_BEYOND_64K
+  CoverageFormat1_3<MediumTypes>format3;
+  CoverageFormat2_4<MediumTypes>format4;
+#endif
+  } u;
+  public:
+  DEFINE_SIZE_UNION (2, format);
+
+  bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    if (!u.format.sanitize (c)) return_trace (false);
+    switch (u.format)
+    {
+    case 1: return_trace (u.format1.sanitize (c));
+    case 2: return_trace (u.format2.sanitize (c));
+#ifndef HB_NO_BEYOND_64K
+    case 3: return_trace (u.format3.sanitize (c));
+    case 4: return_trace (u.format4.sanitize (c));
+#endif
+    default:return_trace (true);
+    }
+  }
+
+  /* Has interface. */
+  unsigned operator [] (hb_codepoint_t k) const { return get (k); }
+  bool has (hb_codepoint_t k) const { return (*this)[k] != NOT_COVERED; }
+  /* Predicate. */
+  bool operator () (hb_codepoint_t k) const { return has (k); }
+
+  unsigned int get (hb_codepoint_t k) const { return get_coverage (k); }
+  unsigned int get_coverage (hb_codepoint_t glyph_id) const
+  {
+    switch (u.format) {
+    case 1: return u.format1.get_coverage (glyph_id);
+    case 2: return u.format2.get_coverage (glyph_id);
+#ifndef HB_NO_BEYOND_64K
+    case 3: return u.format3.get_coverage (glyph_id);
+    case 4: return u.format4.get_coverage (glyph_id);
+#endif
+    default:return NOT_COVERED;
+    }
+  }
+
+  unsigned get_population () const
+  {
+    switch (u.format) {
+    case 1: return u.format1.get_population ();
+    case 2: return u.format2.get_population ();
+#ifndef HB_NO_BEYOND_64K
+    case 3: return u.format3.get_population ();
+    case 4: return u.format4.get_population ();
+#endif
+    default:return NOT_COVERED;
+    }
+  }
+
+  template <typename Iterator,
+      hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_t))>
+  bool serialize (hb_serialize_context_t *c, Iterator glyphs)
+  {
+    TRACE_SERIALIZE (this);
+    if (unlikely (!c->extend_min (this))) return_trace (false);
+
+    unsigned count = 0;
+    unsigned num_ranges = 0;
+    hb_codepoint_t last = (hb_codepoint_t) -2;
+    for (auto g: glyphs)
+    {
+      if (last + 1 != g)
+        num_ranges++;
+      last = g;
+      count++;
+    }
+    u.format = count <= num_ranges * 3 ? 1 : 2;
+
+#ifndef HB_NO_BEYOND_64K
+    if (count && last > 0xFFFFu)
+      u.format += 2;
+#endif
+
+    switch (u.format)
+    {
+    case 1: return_trace (u.format1.serialize (c, glyphs));
+    case 2: return_trace (u.format2.serialize (c, glyphs));
+#ifndef HB_NO_BEYOND_64K
+    case 3: return_trace (u.format3.serialize (c, glyphs));
+    case 4: return_trace (u.format4.serialize (c, glyphs));
+#endif
+    default:return_trace (false);
+    }
+  }
+
+  bool subset (hb_subset_context_t *c) const
+  {
+    TRACE_SUBSET (this);
+    auto it =
+    + iter ()
+    | hb_filter (c->plan->glyph_map_gsub)
+    | hb_map_retains_sorting (c->plan->glyph_map_gsub)
+    ;
+
+    // Cache the iterator result as it will be iterated multiple times
+    // by the serialize code below.
+    hb_sorted_vector_t<hb_codepoint_t> glyphs (it);
+    Coverage_serialize (c->serializer, glyphs.iter ());
+    return_trace (bool (glyphs));
+  }
+
+  bool intersects (const hb_set_t *glyphs) const
+  {
+    switch (u.format)
+    {
+    case 1: return u.format1.intersects (glyphs);
+    case 2: return u.format2.intersects (glyphs);
+#ifndef HB_NO_BEYOND_64K
+    case 3: return u.format3.intersects (glyphs);
+    case 4: return u.format4.intersects (glyphs);
+#endif
+    default:return false;
+    }
+  }
+  bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const
+  {
+    switch (u.format)
+    {
+    case 1: return u.format1.intersects_coverage (glyphs, index);
+    case 2: return u.format2.intersects_coverage (glyphs, index);
+#ifndef HB_NO_BEYOND_64K
+    case 3: return u.format3.intersects_coverage (glyphs, index);
+    case 4: return u.format4.intersects_coverage (glyphs, index);
+#endif
+    default:return false;
+    }
+  }
+
+  /* Might return false if array looks unsorted.
+   * Used for faster rejection of corrupt data. */
+  template <typename set_t>
+  bool collect_coverage (set_t *glyphs) const
+  {
+    switch (u.format)
+    {
+    case 1: return u.format1.collect_coverage (glyphs);
+    case 2: return u.format2.collect_coverage (glyphs);
+#ifndef HB_NO_BEYOND_64K
+    case 3: return u.format3.collect_coverage (glyphs);
+    case 4: return u.format4.collect_coverage (glyphs);
+#endif
+    default:return false;
+    }
+  }
+
+  template <typename IterableOut,
+	    hb_requires (hb_is_sink_of (IterableOut, hb_codepoint_t))>
+  void intersect_set (const hb_set_t &glyphs, IterableOut&& intersect_glyphs) const
+  {
+    switch (u.format)
+    {
+    case 1: return u.format1.intersect_set (glyphs, intersect_glyphs);
+    case 2: return u.format2.intersect_set (glyphs, intersect_glyphs);
+#ifndef HB_NO_BEYOND_64K
+    case 3: return u.format3.intersect_set (glyphs, intersect_glyphs);
+    case 4: return u.format4.intersect_set (glyphs, intersect_glyphs);
+#endif
+    default:return ;
+    }
+  }
+
+  struct iter_t : hb_iter_with_fallback_t<iter_t, hb_codepoint_t>
+  {
+    static constexpr bool is_sorted_iterator = true;
+    iter_t (const Coverage &c_ = Null (Coverage))
+    {
+      hb_memset (this, 0, sizeof (*this));
+      format = c_.u.format;
+      switch (format)
+      {
+      case 1: u.format1.init (c_.u.format1); return;
+      case 2: u.format2.init (c_.u.format2); return;
+#ifndef HB_NO_BEYOND_64K
+      case 3: u.format3.init (c_.u.format3); return;
+      case 4: u.format4.init (c_.u.format4); return;
+#endif
+      default:                               return;
+      }
+    }
+    bool __more__ () const
+    {
+      switch (format)
+      {
+      case 1: return u.format1.__more__ ();
+      case 2: return u.format2.__more__ ();
+#ifndef HB_NO_BEYOND_64K
+      case 3: return u.format3.__more__ ();
+      case 4: return u.format4.__more__ ();
+#endif
+      default:return false;
+      }
+    }
+    void __next__ ()
+    {
+      switch (format)
+      {
+      case 1: u.format1.__next__ (); break;
+      case 2: u.format2.__next__ (); break;
+#ifndef HB_NO_BEYOND_64K
+      case 3: u.format3.__next__ (); break;
+      case 4: u.format4.__next__ (); break;
+#endif
+      default:                   break;
+      }
+    }
+    typedef hb_codepoint_t __item_t__;
+    __item_t__ __item__ () const { return get_glyph (); }
+
+    hb_codepoint_t get_glyph () const
+    {
+      switch (format)
+      {
+      case 1: return u.format1.get_glyph ();
+      case 2: return u.format2.get_glyph ();
+#ifndef HB_NO_BEYOND_64K
+      case 3: return u.format3.get_glyph ();
+      case 4: return u.format4.get_glyph ();
+#endif
+      default:return 0;
+      }
+    }
+    bool operator != (const iter_t& o) const
+    {
+      if (unlikely (format != o.format)) return true;
+      switch (format)
+      {
+      case 1: return u.format1 != o.u.format1;
+      case 2: return u.format2 != o.u.format2;
+#ifndef HB_NO_BEYOND_64K
+      case 3: return u.format3 != o.u.format3;
+      case 4: return u.format4 != o.u.format4;
+#endif
+      default:return false;
+      }
+    }
+    iter_t __end__ () const
+    {
+      iter_t it = {};
+      it.format = format;
+      switch (format)
+      {
+      case 1: it.u.format1 = u.format1.__end__ (); break;
+      case 2: it.u.format2 = u.format2.__end__ (); break;
+#ifndef HB_NO_BEYOND_64K
+      case 3: it.u.format3 = u.format3.__end__ (); break;
+      case 4: it.u.format4 = u.format4.__end__ (); break;
+#endif
+      default: break;
+      }
+      return it;
+    }
+
+    private:
+    unsigned int format;
+    union {
+#ifndef HB_NO_BEYOND_64K
+    CoverageFormat2_4<MediumTypes>::iter_t      format4; /* Put this one first since it's larger; helps shut up compiler. */
+    CoverageFormat1_3<MediumTypes>::iter_t      format3;
+#endif
+    CoverageFormat2_4<SmallTypes>::iter_t       format2; /* Put this one first since it's larger; helps shut up compiler. */
+    CoverageFormat1_3<SmallTypes>::iter_t       format1;
+    } u;
+  };
+  iter_t iter () const { return iter_t (*this); }
+};
+
+template<typename Iterator>
+static inline void
+Coverage_serialize (hb_serialize_context_t *c,
+                    Iterator it)
+{ c->start_embed<Coverage> ()->serialize (c, it); }
+
+}
+}
+}
+
+#endif  // #ifndef OT_LAYOUT_COMMON_COVERAGE_HH