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diff --git a/agg/inc/agg_vpgen_clip_polyline.h b/agg/inc/agg_vpgen_clip_polyline.h
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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software
+// is granted provided this copyright notice appears in all copies.
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+// mcseemagg@yahoo.com
+// http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_VPGEN_CLIP_POLYLINE_INCLUDED
+#define AGG_VPGEN_CLIP_POLYLINE_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+ //======================================================vpgen_clip_polyline
+ //
+ // See Implementation agg_vpgen_clip_polyline.cpp
+ //
+ class vpgen_clip_polyline
+ {
+ public:
+ vpgen_clip_polyline() :
+ m_clip_box(0, 0, 1, 1),
+ m_x1(0),
+ m_y1(0),
+ m_f1(0),
+ m_x2(0),
+ m_y2(0),
+ m_f2(0),
+ m_num_vertices(0),
+ m_vertex(0)
+ {
+ }
+
+ void clip_box(double _x1, double _y1, double _x2, double _y2)
+ {
+ m_clip_box.x1 = _x1;
+ m_clip_box.y1 = _y1;
+ m_clip_box.x2 = _x2;
+ m_clip_box.y2 = _y2;
+ m_clip_box.normalize();
+ }
+
+
+ double x1() const { return m_clip_box.x1; }
+ double y1() const { return m_clip_box.y1; }
+ double x2() const { return m_clip_box.x2; }
+ double y2() const { return m_clip_box.y2; }
+
+ static bool auto_close() { return false; }
+ static bool auto_unclose() { return true; }
+
+ void reset();
+ void move_to(double x, double y);
+ void line_to(double x, double y);
+ unsigned vertex(double* x, double* y);
+
+ private:
+ enum clipping_flags_def
+ {
+ clip_x1 = 1,
+ clip_x2 = 2,
+ clip_y1 = 4,
+ clip_y2 = 8
+ };
+
+ // Determine the clipping code of the vertex according to the
+ // Cyrus-Beck line clipping algorithm
+ //--------------------------------------------------------------------
+ unsigned clipping_flags_x(double x)
+ {
+ unsigned f = 0;
+ if(x < m_clip_box.x1) f |= clip_x1;
+ if(x > m_clip_box.x2) f |= clip_x2;
+ return f;
+ }
+
+ unsigned clipping_flags_y(double y)
+ {
+ unsigned f = 0;
+ if(y < m_clip_box.y1) f |= clip_y1;
+ if(y > m_clip_box.y2) f |= clip_y2;
+ return f;
+ }
+
+ unsigned clipping_flags(double x, double y)
+ {
+ return clipping_flags_x(x) | clipping_flags_y(y);
+ }
+
+ bool move_point(double& x, double& y, unsigned& flags);
+ void clip_line_segment();
+
+ private:
+ rect_d m_clip_box;
+ double m_x1;
+ double m_y1;
+ unsigned m_f1;
+ double m_x2;
+ double m_y2;
+ unsigned m_f2;
+ double m_x[2];
+ double m_y[2];
+ unsigned m_cmd[2];
+ unsigned m_num_vertices;
+ unsigned m_vertex;
+ };
+
+}
+
+
+#endif