diff --git a/layout/svg/renderer/src/libart/nsISVGLibartGlyphMetricsFT.h b/layout/svg/renderer/src/libart/nsISVGLibartGlyphMetricsFT.h
new file mode 100644
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+++ b/layout/svg/renderer/src/libart/nsISVGLibartGlyphMetricsFT.h
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ----- BEGIN LICENSE BLOCK -----
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Mozilla SVG project.
+ *
+ * The Initial Developer of the Original Code is 
+ * .
+ * Portions created by the Initial Developer are Copyright (C) 2002
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *    Leon Sha <leon.sha@sun.com> 
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or 
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the NPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ----- END LICENSE BLOCK ----- */
+
+#ifndef __NS_ISVGLIBART_GLYPHMETRICS_FT_H__
+#define __NS_ISVGLIBART_GLYPHMETRICS_FT_H__
+
+#include "nsISVGRendererGlyphMetrics.h"
+#include "nsIFreeType2.h"
+
+// {b74698f5-b016-4423-a742-d2a14e5d8c45}
+#define NS_ISVGLIBARTGLYPHMETRICSFT_IID \
+{ 0xb74698f5, 0xb016, 0x4423, { 0xa7, 0x42, 0xd2, 0xa1, 0x4e, 0x5d, 0x8c, 0x45 } }
+
+/**
+ * \addtogroup libart_renderer Libart Rendering Engine
+ * @{
+ */
+//////////////////////////////////////////////////////////////////////
+/**
+ *  'Private' rendering engine interface
+ */
+class nsISVGLibartGlyphMetricsFT : public nsISVGRendererGlyphMetrics
+{
+public:
+  NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISVGLIBARTGLYPHMETRICSFT_IID)
+  NS_IMETHOD_(FT_Face) GetFTFace() = 0;
+  NS_IMETHOD_(float) GetPixelScale() = 0;
+  NS_IMETHOD_(float) GetTwipsToPixels() = 0;
+  NS_IMETHOD_(const FT_BBox*) GetBoundingBox() = 0;
+  NS_IMETHOD_(PRUint32) GetGlyphCount() = 0;
+  NS_IMETHOD_(FT_Glyph) GetGlyphAt(PRUint32 pos) = 0;
+};
+
+/** @} */
+
+#endif // __NS_ISVGLIBART_GLYPHMETRICS_FT_H__