/usr/include/agg2/agg_line_aa_basics.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_LINE_AA_BASICS_INCLUDED
#define AGG_LINE_AA_BASICS_INCLUDED
#include <stdlib.h>
#include "agg_basics.h"
namespace agg
{
// See Implementation agg_line_aa_basics.cpp
//-------------------------------------------------------------------------
enum line_subpixel_scale_e
{
line_subpixel_shift = 8, //----line_subpixel_shift
line_subpixel_scale = 1 << line_subpixel_shift, //----line_subpixel_scale
line_subpixel_mask = line_subpixel_scale - 1, //----line_subpixel_mask
line_max_coord = (1 << 28) - 1, //----line_max_coord
line_max_length = 1 << (line_subpixel_shift + 10) //----line_max_length
};
//-------------------------------------------------------------------------
enum line_mr_subpixel_scale_e
{
line_mr_subpixel_shift = 4, //----line_mr_subpixel_shift
line_mr_subpixel_scale = 1 << line_mr_subpixel_shift, //----line_mr_subpixel_scale
line_mr_subpixel_mask = line_mr_subpixel_scale - 1 //----line_mr_subpixel_mask
};
//------------------------------------------------------------------line_mr
AGG_INLINE int line_mr(int x)
{
return x >> (line_subpixel_shift - line_mr_subpixel_shift);
}
//-------------------------------------------------------------------line_hr
AGG_INLINE int line_hr(int x)
{
return x << (line_subpixel_shift - line_mr_subpixel_shift);
}
//---------------------------------------------------------------line_dbl_hr
AGG_INLINE int line_dbl_hr(int x)
{
return x << line_subpixel_shift;
}
//---------------------------------------------------------------line_coord
struct line_coord
{
AGG_INLINE static int conv(double x)
{
return iround(x * line_subpixel_scale);
}
};
//-----------------------------------------------------------line_coord_sat
struct line_coord_sat
{
AGG_INLINE static int conv(double x)
{
return saturation<line_max_coord>::iround(x * line_subpixel_scale);
}
};
//==========================================================line_parameters
struct line_parameters
{
//---------------------------------------------------------------------
line_parameters() {}
line_parameters(int x1_, int y1_, int x2_, int y2_, int len_) :
x1(x1_), y1(y1_), x2(x2_), y2(y2_),
dx(abs(x2_ - x1_)),
dy(abs(y2_ - y1_)),
sx((x2_ > x1_) ? 1 : -1),
sy((y2_ > y1_) ? 1 : -1),
vertical(dy >= dx),
inc(vertical ? sy : sx),
len(len_),
octant((sy & 4) | (sx & 2) | int(vertical))
{
}
//---------------------------------------------------------------------
unsigned orthogonal_quadrant() const { return s_orthogonal_quadrant[octant]; }
unsigned diagonal_quadrant() const { return s_diagonal_quadrant[octant]; }
//---------------------------------------------------------------------
bool same_orthogonal_quadrant(const line_parameters& lp) const
{
return s_orthogonal_quadrant[octant] == s_orthogonal_quadrant[lp.octant];
}
//---------------------------------------------------------------------
bool same_diagonal_quadrant(const line_parameters& lp) const
{
return s_diagonal_quadrant[octant] == s_diagonal_quadrant[lp.octant];
}
//---------------------------------------------------------------------
void divide(line_parameters& lp1, line_parameters& lp2) const
{
int xmid = (x1 + x2) >> 1;
int ymid = (y1 + y2) >> 1;
int len2 = len >> 1;
lp1 = *this;
lp2 = *this;
lp1.x2 = xmid;
lp1.y2 = ymid;
lp1.len = len2;
lp1.dx = abs(lp1.x2 - lp1.x1);
lp1.dy = abs(lp1.y2 - lp1.y1);
lp2.x1 = xmid;
lp2.y1 = ymid;
lp2.len = len2;
lp2.dx = abs(lp2.x2 - lp2.x1);
lp2.dy = abs(lp2.y2 - lp2.y1);
}
//---------------------------------------------------------------------
int x1, y1, x2, y2, dx, dy, sx, sy;
bool vertical;
int inc;
int len;
int octant;
//---------------------------------------------------------------------
static const int8u s_orthogonal_quadrant[8];
static const int8u s_diagonal_quadrant[8];
};
// See Implementation agg_line_aa_basics.cpp
//----------------------------------------------------------------bisectrix
void bisectrix(const line_parameters& l1,
const line_parameters& l2,
int* x, int* y);
//-------------------------------------------fix_degenerate_bisectrix_start
void inline fix_degenerate_bisectrix_start(const line_parameters& lp,
int* x, int* y)
{
int d = iround((double(*x - lp.x2) * double(lp.y2 - lp.y1) -
double(*y - lp.y2) * double(lp.x2 - lp.x1)) / lp.len);
if(d < line_subpixel_scale/2)
{
*x = lp.x1 + (lp.y2 - lp.y1);
*y = lp.y1 - (lp.x2 - lp.x1);
}
}
//---------------------------------------------fix_degenerate_bisectrix_end
void inline fix_degenerate_bisectrix_end(const line_parameters& lp,
int* x, int* y)
{
int d = iround((double(*x - lp.x2) * double(lp.y2 - lp.y1) -
double(*y - lp.y2) * double(lp.x2 - lp.x1)) / lp.len);
if(d < line_subpixel_scale/2)
{
*x = lp.x2 + (lp.y2 - lp.y1);
*y = lp.y2 - (lp.x2 - lp.x1);
}
}
}
#endif
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