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diff --git a/src/ftgl/FTFont/FTExtrudeFontImpl.h b/src/ftgl/FTFont/FTExtrudeFontImpl.h
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+++ b/src/ftgl/FTFont/FTExtrudeFontImpl.h
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+/*
+ * FTGL - OpenGL font library
+ *
+ * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
+ * Copyright (c) 2008 Sam Hocevar <sam@zoy.org>
+ *
+ * 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, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * 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.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __FTExtrudeFontImpl__
+#define __FTExtrudeFontImpl__
+
+#include "FTFontImpl.h"
+
+class FTGlyph;
+
+class FTExtrudeFontImpl : public FTFontImpl
+{
+    friend class FTExtrudeFont;
+
+    protected:
+        FTExtrudeFontImpl(FTFont *ftFont, const char* fontFilePath);
+
+        FTExtrudeFontImpl(FTFont *ftFont, const unsigned char *pBufferBytes,
+                          size_t bufferSizeInBytes);
+
+        /**
+         * Set the extrusion distance for the font.
+         *
+         * @param d  The extrusion distance.
+         */
+        virtual void Depth(float d) { depth = d; }
+
+        /**
+         * Set the outset distance for the font. Only implemented by
+         * FTOutlineFont, FTPolygonFont and FTExtrudeFont
+         *
+         * @param o  The outset distance.
+         */
+        virtual void Outset(float o) { front = back = o; }
+
+        /**
+         * Set the outset distance for the font. Only implemented by
+         * FTExtrudeFont
+         *
+         * @param f  The front outset distance.
+         * @param b  The back outset distance.
+         */
+        virtual void Outset(float f, float b) { front = f; back = b; }
+
+    private:
+        /**
+         * The extrusion distance for the font.
+         */
+        float depth;
+
+        /**
+         * The outset distance (front and back) for the font.
+         */
+        float front, back;
+};
+
+#endif // __FTExtrudeFontImpl__
+