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diff --git a/src/3rdparty/libdepixelize/splines.h b/src/3rdparty/libdepixelize/splines.h
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+/*  This file is part of the libdepixelize project
+    Copyright (C) 2013 Vinícius dos Santos Oliveira <vini.ipsmaker@gmail.com>
+
+    GNU Lesser General Public License Usage
+    This library is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Lesser General Public License as published by the
+    Free Software Foundation; either version 2.1 of the License, or (at your
+    option) any later version.
+    You should have received a copy of the GNU Lesser General Public License
+    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+    GNU General Public License Usage
+    Alternatively, this library may be used under the terms of the GNU General
+    Public License as published by the Free Software Foundation, either version
+    2 of the License, or (at your option) any later version.
+    You should have received a copy of the GNU General Public License along with
+    this library.  If not, see <http://www.gnu.org/licenses/>.
+
+    This library 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
+    Lesser General Public License for more details.
+*/
+
+#ifndef LIBDEPIXELIZE_TRACER_SPLINES_H
+#define LIBDEPIXELIZE_TRACER_SPLINES_H
+
+#include <2geom/pathvector.h>
+#include <glib.h>
+
+namespace Tracer {
+
+template<typename T, bool adjust_splines = true>
+class SimplifiedVoronoi;
+
+template<typename T>
+class HomogeneousSplines;
+
+class Splines
+{
+public:
+    struct Path
+    {
+        /**
+         * It may be benefited from C++11 move references.
+         */
+        Geom::PathVector pathVector;
+
+        guint8 rgba[4];
+    };
+
+    typedef std::vector<Path>::iterator iterator;
+    typedef std::vector<Path>::const_iterator const_iterator;
+
+    Splines() /* = default */ {}
+
+    template<typename T, bool adjust_splines>
+    Splines(const SimplifiedVoronoi<T, adjust_splines> &simplifiedVoronoi);
+
+    /**
+     * There are two levels of optimization. The first level only removes
+     * redundant points of colinear points. The second level uses the
+     * Kopf-Lischinski optimization. The first level is always enabled.
+     * The second level is enabled using \p optimize.
+     */
+    template<typename T>
+    Splines(const HomogeneousSplines<T> &homogeneousSplines, bool optimize,
+            int nthreads);
+
+    // Iterators
+    iterator begin()
+    {
+        return _paths.begin();
+    }
+
+    const_iterator begin() const
+    {
+        return _paths.begin();
+    }
+
+    iterator end()
+    {
+        return _paths.end();
+    }
+
+    const_iterator end() const
+    {
+        return _paths.end();
+    }
+
+    int width() const
+    {
+        return _width;
+    }
+
+    int height() const
+    {
+        return _height;
+    }
+
+private:
+    std::vector<Path> _paths;
+    int _width;
+    int _height;
+};
+
+} // namespace Tracer
+
+#endif // LIBDEPIXELIZE_TRACER_SPLINES_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :