/usr/include/agg2/agg_conv_close_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.
//----------------------------------------------------------------------------
#ifndef AGG_CONV_CLOSE_POLYGON_INCLUDED
#define AGG_CONV_CLOSE_POLYGON_INCLUDED
#include "agg_basics.h"
namespace agg
{
//======================================================conv_close_polygon
template<class VertexSource> class conv_close_polygon
{
public:
explicit conv_close_polygon(VertexSource& vs) : m_source(&vs) {}
void attach(VertexSource& source) { m_source = &source; }
void rewind(unsigned path_id);
unsigned vertex(double* x, double* y);
private:
conv_close_polygon(const conv_close_polygon<VertexSource>&);
const conv_close_polygon<VertexSource>&
operator = (const conv_close_polygon<VertexSource>&);
VertexSource* m_source;
unsigned m_cmd[2];
double m_x[2];
double m_y[2];
unsigned m_vertex;
bool m_line_to;
};
//------------------------------------------------------------------------
template<class VertexSource>
void conv_close_polygon<VertexSource>::rewind(unsigned path_id)
{
m_source->rewind(path_id);
m_vertex = 2;
m_line_to = false;
}
//------------------------------------------------------------------------
template<class VertexSource>
unsigned conv_close_polygon<VertexSource>::vertex(double* x, double* y)
{
unsigned cmd = path_cmd_stop;
for(;;)
{
if(m_vertex < 2)
{
*x = m_x[m_vertex];
*y = m_y[m_vertex];
cmd = m_cmd[m_vertex];
++m_vertex;
break;
}
cmd = m_source->vertex(x, y);
if(is_end_poly(cmd))
{
cmd |= path_flags_close;
break;
}
if(is_stop(cmd))
{
if(m_line_to)
{
m_cmd[0] = path_cmd_end_poly | path_flags_close;
m_cmd[1] = path_cmd_stop;
m_vertex = 0;
m_line_to = false;
continue;
}
break;
}
if(is_move_to(cmd))
{
if(m_line_to)
{
m_x[0] = 0.0;
m_y[0] = 0.0;
m_cmd[0] = path_cmd_end_poly | path_flags_close;
m_x[1] = *x;
m_y[1] = *y;
m_cmd[1] = cmd;
m_vertex = 0;
m_line_to = false;
continue;
}
break;
}
if(is_vertex(cmd))
{
m_line_to = true;
break;
}
}
return cmd;
}
}
#endif
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