/usr/include/agg2/agg_pattern_filters_rgba.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_PATTERN_FILTERS_RGBA8_INCLUDED
#define AGG_PATTERN_FILTERS_RGBA8_INCLUDED
#include "agg_basics.h"
#include "agg_line_aa_basics.h"
#include "agg_color_rgba.h"
namespace agg
{
//=======================================================pattern_filter_nn
template<class ColorT> struct pattern_filter_nn
{
typedef ColorT color_type;
static unsigned dilation() { return 0; }
static void AGG_INLINE pixel_low_res(color_type const* const* buf,
color_type* p, int x, int y)
{
*p = buf[y][x];
}
static void AGG_INLINE pixel_high_res(color_type const* const* buf,
color_type* p, int x, int y)
{
*p = buf[y >> line_subpixel_shift]
[x >> line_subpixel_shift];
}
};
typedef pattern_filter_nn<rgba8> pattern_filter_nn_rgba8;
typedef pattern_filter_nn<rgba16> pattern_filter_nn_rgba16;
//===========================================pattern_filter_bilinear_rgba
template<class ColorT> struct pattern_filter_bilinear_rgba
{
typedef ColorT color_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
static unsigned dilation() { return 1; }
static AGG_INLINE void pixel_low_res(color_type const* const* buf,
color_type* p, int x, int y)
{
*p = buf[y][x];
}
static AGG_INLINE void pixel_high_res(color_type const* const* buf,
color_type* p, int x, int y)
{
calc_type r, g, b, a;
r = g = b = a = line_subpixel_scale * line_subpixel_scale / 2;
calc_type weight;
int x_lr = x >> line_subpixel_shift;
int y_lr = y >> line_subpixel_shift;
x &= line_subpixel_mask;
y &= line_subpixel_mask;
const color_type* ptr = buf[y_lr] + x_lr;
weight = (line_subpixel_scale - x) *
(line_subpixel_scale - y);
r += weight * ptr->r;
g += weight * ptr->g;
b += weight * ptr->b;
a += weight * ptr->a;
++ptr;
weight = x * (line_subpixel_scale - y);
r += weight * ptr->r;
g += weight * ptr->g;
b += weight * ptr->b;
a += weight * ptr->a;
ptr = buf[y_lr + 1] + x_lr;
weight = (line_subpixel_scale - x) * y;
r += weight * ptr->r;
g += weight * ptr->g;
b += weight * ptr->b;
a += weight * ptr->a;
++ptr;
weight = x * y;
r += weight * ptr->r;
g += weight * ptr->g;
b += weight * ptr->b;
a += weight * ptr->a;
p->r = (value_type)(r >> line_subpixel_shift * 2);
p->g = (value_type)(g >> line_subpixel_shift * 2);
p->b = (value_type)(b >> line_subpixel_shift * 2);
p->a = (value_type)(a >> line_subpixel_shift * 2);
}
};
typedef pattern_filter_bilinear_rgba<rgba8> pattern_filter_bilinear_rgba8;
typedef pattern_filter_bilinear_rgba<rgba16> pattern_filter_bilinear_rgba16;
}
#endif
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