/usr/include/agg2/agg_conv_clip_polygon.h is in libagg-dev 2.5+dfsg1-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Anti-Grain Geometry (AGG) - Version 2.5
// A high quality rendering engine for C++
// Copyright (C) 2002-2006 Maxim Shemanarev
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://antigrain.com
//
// AGG 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 2
// of the License, or (at your option) any later version.
//
// AGG 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 AGG; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301, USA.
//----------------------------------------------------------------------------
//
// Polygon clipping converter
// There an optimized Liang-Basky algorithm is used.
// The algorithm doesn't optimize the degenerate edges, i.e. it will never
// break a closed polygon into two or more ones, instead, there will be
// degenerate edges coinciding with the respective clipping boundaries.
// This is a sub-optimal solution, because that optimization would require
// extra, rather expensive math while the rasterizer tolerates it quite well,
// without any considerable overhead.
//
//----------------------------------------------------------------------------
#ifndef AGG_CONV_CLIP_POLYGON_INCLUDED
#define AGG_CONV_CLIP_POLYGON_INCLUDED
#include "agg_basics.h"
#include "agg_conv_adaptor_vpgen.h"
#include "agg_vpgen_clip_polygon.h"
namespace agg
{
//=======================================================conv_clip_polygon
template<class VertexSource>
struct conv_clip_polygon : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>
{
typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon> base_type;
conv_clip_polygon(VertexSource& vs) :
conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>(vs) {}
void clip_box(double x1, double y1, double x2, double y2)
{
base_type::vpgen().clip_box(x1, y1, x2, y2);
}
double x1() const { return base_type::vpgen().x1(); }
double y1() const { return base_type::vpgen().y1(); }
double x2() const { return base_type::vpgen().x2(); }
double y2() const { return base_type::vpgen().y2(); }
private:
conv_clip_polygon(const conv_clip_polygon<VertexSource>&);
const conv_clip_polygon<VertexSource>&
operator = (const conv_clip_polygon<VertexSource>&);
};
}
#endif
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