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diff --git a/thirdparty/harfbuzz/src/hb-subset-input.hh b/thirdparty/harfbuzz/src/hb-subset-input.hh
new file mode 100644
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+++ b/thirdparty/harfbuzz/src/hb-subset-input.hh
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+/*
+ * Copyright © 2018  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, Roderick Sheeter
+ */
+
+#ifndef HB_SUBSET_INPUT_HH
+#define HB_SUBSET_INPUT_HH
+
+
+#include "hb.hh"
+
+#include "hb-subset.h"
+#include "hb-map.hh"
+#include "hb-set.hh"
+
+#include "hb-font.hh"
+
+HB_MARK_AS_FLAG_T (hb_subset_flags_t);
+
+struct hb_subset_input_t
+{
+  hb_object_header_t header;
+
+  union {
+    struct {
+      hb_set_t *glyphs;
+      hb_set_t *unicodes;
+      hb_set_t *no_subset_tables;
+      hb_set_t *drop_tables;
+      hb_set_t *name_ids;
+      hb_set_t *name_languages;
+      hb_set_t *layout_features;
+    } sets;
+    hb_set_t* set_ptrs[sizeof (sets) / sizeof (hb_set_t*)];
+  };
+
+  unsigned flags;
+
+  inline unsigned num_sets () const
+  {
+    return sizeof (set_ptrs) / sizeof (hb_set_t*);
+  }
+
+  inline hb_array_t<hb_set_t*> sets_iter ()
+  {
+    return hb_array_t<hb_set_t*> (set_ptrs, num_sets ());
+  }
+
+  bool in_error () const
+  {
+    for (unsigned i = 0; i < num_sets (); i++)
+    {
+      if (unlikely (set_ptrs[i]->in_error ()))
+        return true;
+    }
+    return false;
+  }
+};
+
+
+#endif /* HB_SUBSET_INPUT_HH */