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diff --git a/dviware/dvisvgm/src/GFTracer.hpp b/dviware/dvisvgm/src/GFTracer.hpp
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+++ b/dviware/dvisvgm/src/GFTracer.hpp
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+/*************************************************************************
+** GFTracer.hpp                                                         **
+**                                                                      **
+** This file is part of dvisvgm -- a fast DVI to SVG converter          **
+** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#ifndef GFTRACER_HPP
+#define GFTRACER_HPP
+
+#include <istream>
+#include "GFReader.hpp"
+
+class GFTracer : public GFReader {
+	public:
+		explicit GFTracer (std::istream &is);
+		GFTracer (std::istream &is, double upp);
+		virtual void moveTo (double x, double y) =0;
+		virtual void lineTo (double x, double y) =0;
+		virtual void curveTo (double c1x, double c1y, double c2x, double c2y, double x, double y) =0;
+		virtual void closePath () =0;
+		void beginChar (uint32_t c) override;
+		void endChar (uint32_t c) override;
+
+	protected:
+		void unitsPerPoint(double upp) {_unitsPerPoint = upp;}
+
+	private:
+		double _unitsPerPoint; ///< target units per PS point
+};
+
+#endif