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diff --git a/gfx/thebes/gfxScriptItemizer.h b/gfx/thebes/gfxScriptItemizer.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted
+ * for use within Mozilla Gecko, separate from a standard ICU build.
+ *
+ * The original ICU license of the code follows:
+ *
+ * ICU License - ICU 1.8.1 and later
+ *
+ * COPYRIGHT AND PERMISSION NOTICE
+ *
+ * Copyright (c) 1995-2009 International Business Machines Corporation and
+ * others
+ *
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, provided that the above copyright notice(s) and this
+ * permission notice appear in all copies of the Software and that both the
+ * above copyright notice(s) and this permission notice appear in supporting
+ * documentation.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
+ * BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ *
+ * Except as contained in this notice, the name of a copyright holder shall
+ * not be used in advertising or otherwise to promote the sale, use or other
+ * dealings in this Software without prior written authorization of the
+ * copyright holder.
+ *
+ * All trademarks and registered trademarks mentioned herein are the property
+ * of their respective owners.
+ */
+
+#ifndef GFX_SCRIPTITEMIZER_H
+#define GFX_SCRIPTITEMIZER_H
+
+#include <stdint.h>
+#include "nsUnicodeScriptCodes.h"
+
+#define PAREN_STACK_DEPTH 32
+
+class gfxScriptItemizer {
+ public:
+  typedef mozilla::unicode::Script Script;
+
+  gfxScriptItemizer(const char16_t* src, uint32_t length);
+
+  void SetText(const char16_t* src, uint32_t length);
+
+  bool Next(uint32_t& aRunStart, uint32_t& aRunLimit, Script& aRunScript);
+
+ protected:
+  void reset() {
+    scriptStart = 0;
+    scriptLimit = 0;
+    scriptCode = Script::INVALID;
+    parenSP = -1;
+    pushCount = 0;
+    fixupCount = 0;
+  }
+
+  void push(uint32_t endPairChar, Script newScriptCode);
+  void pop();
+  void fixup(Script newScriptCode);
+
+  struct ParenStackEntry {
+    uint32_t endPairChar;
+    Script scriptCode;
+  };
+
+  const char16_t* textPtr;
+  uint32_t textLength;
+
+  uint32_t scriptStart;
+  uint32_t scriptLimit;
+  Script scriptCode;
+
+  struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
+  uint32_t parenSP;
+  uint32_t pushCount;
+  uint32_t fixupCount;
+};
+
+#endif /* GFX_SCRIPTITEMIZER_H */