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diff --git a/gfx/harfbuzz/src/hb-subset-accelerator.hh b/gfx/harfbuzz/src/hb-subset-accelerator.hh
new file mode 100644
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+++ b/gfx/harfbuzz/src/hb-subset-accelerator.hh
@@ -0,0 +1,134 @@
+/*
+ * Copyright © 2022  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.
+ *
+ * Google Author(s): Garret Rieger
+ */
+
+#ifndef HB_SUBSET_ACCELERATOR_HH
+#define HB_SUBSET_ACCELERATOR_HH
+
+
+#include "hb.hh"
+
+#include "hb-map.hh"
+#include "hb-multimap.hh"
+#include "hb-set.hh"
+
+extern HB_INTERNAL hb_user_data_key_t _hb_subset_accelerator_user_data_key;
+
+namespace CFF {
+struct cff_subset_accelerator_t;
+}
+
+namespace OT {
+struct SubtableUnicodesCache;
+};
+
+struct hb_subset_accelerator_t
+{
+  static hb_user_data_key_t* user_data_key()
+  {
+    return &_hb_subset_accelerator_user_data_key;
+  }
+
+  static hb_subset_accelerator_t* create(const hb_map_t& unicode_to_gid_,
+					 const hb_multimap_t gid_to_unicodes_,
+					 const hb_set_t& unicodes_,
+					 bool has_seac_) {
+    hb_subset_accelerator_t* accel =
+        (hb_subset_accelerator_t*) hb_calloc (1, sizeof(hb_subset_accelerator_t));
+
+    if (unlikely (!accel)) return accel;
+
+    new (accel) hb_subset_accelerator_t (unicode_to_gid_,
+					 gid_to_unicodes_,
+					 unicodes_,
+					 has_seac_);
+
+    return accel;
+  }
+
+  static void destroy (void* p)
+  {
+    if (!p) return;
+
+    hb_subset_accelerator_t *accel = (hb_subset_accelerator_t *) p;
+
+    accel->~hb_subset_accelerator_t ();
+
+    hb_free (accel);
+  }
+
+  hb_subset_accelerator_t (const hb_map_t& unicode_to_gid_,
+			   const hb_multimap_t& gid_to_unicodes_,
+			   const hb_set_t& unicodes_,
+			   bool has_seac_) :
+    unicode_to_gid(unicode_to_gid_),
+    gid_to_unicodes (gid_to_unicodes_),
+    unicodes(unicodes_),
+    cmap_cache(nullptr),
+    destroy_cmap_cache(nullptr),
+    has_seac(has_seac_),
+    cff_accelerator(nullptr),
+    destroy_cff_accelerator(nullptr) {}
+
+  ~hb_subset_accelerator_t ()
+  {
+    if (cff_accelerator && destroy_cff_accelerator)
+      destroy_cff_accelerator ((void*) cff_accelerator);
+
+    if (cmap_cache && destroy_cmap_cache)
+      destroy_cmap_cache ((void*) cmap_cache);
+  }
+
+  // Generic
+
+  mutable hb_mutex_t sanitized_table_cache_lock;
+  mutable hb_hashmap_t<hb_tag_t, hb::unique_ptr<hb_blob_t>> sanitized_table_cache;
+
+  const hb_map_t unicode_to_gid;
+  const hb_multimap_t gid_to_unicodes;
+  const hb_set_t unicodes;
+
+  // cmap
+  const OT::SubtableUnicodesCache* cmap_cache;
+  hb_destroy_func_t destroy_cmap_cache;
+
+  // CFF
+  bool has_seac;
+  const CFF::cff_subset_accelerator_t* cff_accelerator;
+  hb_destroy_func_t destroy_cff_accelerator;
+
+  // TODO(garretrieger): cumulative glyf checksum map
+
+  bool in_error () const
+  {
+    return unicode_to_gid.in_error () ||
+	   gid_to_unicodes.in_error () ||
+	   unicodes.in_error () ||
+	   sanitized_table_cache.in_error ();
+  }
+};
+
+
+#endif /* HB_SUBSET_ACCELERATOR_HH */