/usr/include/agg2/agg_ellipse_bresenham.h is in libagg-dev 2.5+dfsg1-9.
This file is owned by root:root, with mode 0o644.
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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_ELLIPSE_BRESENHAM_INCLUDED
#define AGG_ELLIPSE_BRESENHAM_INCLUDED
#include "agg_basics.h"
namespace agg
{
//------------------------------------------ellipse_bresenham_interpolator
class ellipse_bresenham_interpolator
{
public:
ellipse_bresenham_interpolator(int rx, int ry) :
m_rx2(rx * rx),
m_ry2(ry * ry),
m_two_rx2(m_rx2 << 1),
m_two_ry2(m_ry2 << 1),
m_dx(0),
m_dy(0),
m_inc_x(0),
m_inc_y(-ry * m_two_rx2),
m_cur_f(0)
{}
int dx() const { return m_dx; }
int dy() const { return m_dy; }
void operator++ ()
{
int mx, my, mxy, min_m;
int fx, fy, fxy;
mx = fx = m_cur_f + m_inc_x + m_ry2;
if(mx < 0) mx = -mx;
my = fy = m_cur_f + m_inc_y + m_rx2;
if(my < 0) my = -my;
mxy = fxy = m_cur_f + m_inc_x + m_ry2 + m_inc_y + m_rx2;
if(mxy < 0) mxy = -mxy;
min_m = mx;
bool flag = true;
if(min_m > my)
{
min_m = my;
flag = false;
}
m_dx = m_dy = 0;
if(min_m > mxy)
{
m_inc_x += m_two_ry2;
m_inc_y += m_two_rx2;
m_cur_f = fxy;
m_dx = 1;
m_dy = 1;
return;
}
if(flag)
{
m_inc_x += m_two_ry2;
m_cur_f = fx;
m_dx = 1;
return;
}
m_inc_y += m_two_rx2;
m_cur_f = fy;
m_dy = 1;
}
private:
int m_rx2;
int m_ry2;
int m_two_rx2;
int m_two_ry2;
int m_dx;
int m_dy;
int m_inc_x;
int m_inc_y;
int m_cur_f;
};
}
#endif
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