/usr/include/agg2/agg_span_subdiv_adaptor.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_SPAN_SUBDIV_ADAPTOR_INCLUDED
#define AGG_SPAN_SUBDIV_ADAPTOR_INCLUDED
#include "agg_basics.h"
namespace agg
{
//=================================================span_subdiv_adaptor
template<class Interpolator, unsigned SubpixelShift = 8>
class span_subdiv_adaptor
{
public:
typedef Interpolator interpolator_type;
typedef typename interpolator_type::trans_type trans_type;
enum sublixel_scale_e
{
subpixel_shift = SubpixelShift,
subpixel_scale = 1 << subpixel_shift
};
//----------------------------------------------------------------
span_subdiv_adaptor() :
m_subdiv_shift(4),
m_subdiv_size(1 << m_subdiv_shift),
m_subdiv_mask(m_subdiv_size - 1) {}
span_subdiv_adaptor(interpolator_type& interpolator,
unsigned subdiv_shift = 4) :
m_subdiv_shift(subdiv_shift),
m_subdiv_size(1 << m_subdiv_shift),
m_subdiv_mask(m_subdiv_size - 1),
m_interpolator(&interpolator) {}
span_subdiv_adaptor(interpolator_type& interpolator,
double x, double y, unsigned len,
unsigned subdiv_shift = 4) :
m_subdiv_shift(subdiv_shift),
m_subdiv_size(1 << m_subdiv_shift),
m_subdiv_mask(m_subdiv_size - 1),
m_interpolator(&interpolator)
{
begin(x, y, len);
}
//----------------------------------------------------------------
const interpolator_type& interpolator() const { return *m_interpolator; }
void interpolator(interpolator_type& intr) { m_interpolator = &intr; }
//----------------------------------------------------------------
const trans_type& transformer() const
{
return *m_interpolator->transformer();
}
void transformer(const trans_type& trans)
{
m_interpolator->transformer(trans);
}
//----------------------------------------------------------------
unsigned subdiv_shift() const { return m_subdiv_shift; }
void subdiv_shift(unsigned shift)
{
m_subdiv_shift = shift;
m_subdiv_size = 1 << m_subdiv_shift;
m_subdiv_mask = m_subdiv_size - 1;
}
//----------------------------------------------------------------
void begin(double x, double y, unsigned len)
{
m_pos = 1;
m_src_x = iround(x * subpixel_scale) + subpixel_scale;
m_src_y = y;
m_len = len;
if(len > m_subdiv_size) len = m_subdiv_size;
m_interpolator->begin(x, y, len);
}
//----------------------------------------------------------------
void operator++()
{
++(*m_interpolator);
if(m_pos >= m_subdiv_size)
{
unsigned len = m_len;
if(len > m_subdiv_size) len = m_subdiv_size;
m_interpolator->resynchronize(double(m_src_x) / double(subpixel_scale) + len,
m_src_y,
len);
m_pos = 0;
}
m_src_x += subpixel_scale;
++m_pos;
--m_len;
}
//----------------------------------------------------------------
void coordinates(int* x, int* y) const
{
m_interpolator->coordinates(x, y);
}
//----------------------------------------------------------------
void local_scale(int* x, int* y) const
{
m_interpolator->local_scale(x, y);
}
private:
unsigned m_subdiv_shift;
unsigned m_subdiv_size;
unsigned m_subdiv_mask;
interpolator_type* m_interpolator;
int m_src_x;
double m_src_y;
unsigned m_pos;
unsigned m_len;
};
}
#endif
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