/usr/include/agg2/agg_span_interpolator_trans.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.
//----------------------------------------------------------------------------
//
// Horizontal span interpolator for use with an arbitrary transformer
// The efficiency highly depends on the operations done in the transformer
//
//----------------------------------------------------------------------------
#ifndef AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
#define AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
#include "agg_basics.h"
namespace agg
{
//=================================================span_interpolator_trans
template<class Transformer, unsigned SubpixelShift = 8>
class span_interpolator_trans
{
public:
typedef Transformer trans_type;
enum subpixel_scale_e
{
subpixel_shift = SubpixelShift,
subpixel_scale = 1 << subpixel_shift
};
//--------------------------------------------------------------------
span_interpolator_trans() {}
span_interpolator_trans(const trans_type& trans) : m_trans(&trans) {}
span_interpolator_trans(const trans_type& trans,
double x, double y, unsigned) :
m_trans(&trans)
{
begin(x, y, 0);
}
//----------------------------------------------------------------
const trans_type& transformer() const { return *m_trans; }
void transformer(const trans_type& trans) { m_trans = &trans; }
//----------------------------------------------------------------
void begin(double x, double y, unsigned)
{
m_x = x;
m_y = y;
m_trans->transform(&x, &y);
m_ix = iround(x * subpixel_scale);
m_iy = iround(y * subpixel_scale);
}
//----------------------------------------------------------------
void operator++()
{
m_x += 1.0;
double x = m_x;
double y = m_y;
m_trans->transform(&x, &y);
m_ix = iround(x * subpixel_scale);
m_iy = iround(y * subpixel_scale);
}
//----------------------------------------------------------------
void coordinates(int* x, int* y) const
{
*x = m_ix;
*y = m_iy;
}
private:
const trans_type* m_trans;
double m_x;
double m_y;
int m_ix;
int m_iy;
};
}
#endif
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