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diff --git a/thirdparty/harfbuzz/src/hb-subset-accelerator.hh b/thirdparty/harfbuzz/src/hb-subset-accelerator.hh
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+++ b/thirdparty/harfbuzz/src/hb-subset-accelerator.hh
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+/*
+ * 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-set.hh"
+
+struct hb_subset_accelerator_t
+{
+  static hb_user_data_key_t* user_data_key()
+  {
+    static hb_user_data_key_t key;
+    return &key;
+  }
+
+  static hb_subset_accelerator_t* create(const hb_map_t& unicode_to_gid_,
+                                         const hb_set_t& unicodes_) {
+    hb_subset_accelerator_t* accel =
+        (hb_subset_accelerator_t*) hb_malloc (sizeof(hb_subset_accelerator_t));
+    new (accel) hb_subset_accelerator_t (unicode_to_gid_, unicodes_);
+    return accel;
+  }
+
+  static void destroy(void* value) {
+    if (!value) return;
+
+    hb_subset_accelerator_t* accel = (hb_subset_accelerator_t*) value;
+    accel->~hb_subset_accelerator_t ();
+    hb_free (accel);
+  }
+
+  hb_subset_accelerator_t(const hb_map_t& unicode_to_gid_,
+                          const hb_set_t& unicodes_)
+      : unicode_to_gid(unicode_to_gid_), unicodes(unicodes_) {}
+
+  const hb_map_t unicode_to_gid;
+  const hb_set_t unicodes;
+  // TODO(garretrieger): cumulative glyf checksum map
+  // TODO(garretrieger): sanitized table cache.
+
+  bool in_error () const
+  {
+    return unicode_to_gid.in_error() || unicodes.in_error ();
+  }
+};
+
+
+#endif /* HB_SUBSET_ACCELERATOR_HH */