/usr/include/mapnik/span_image_filter.hpp is in libmapnik-dev 2.2.0+ds1-7+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2012 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#include <boost/cstdint.hpp>
#include "agg_span_image_filter_rgba.h"
namespace mapnik {
using namespace agg;
template<class Source>
class span_image_resample_rgba_affine :
public span_image_resample_affine<Source>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef typename source_type::order_type order_type;
typedef span_image_resample_affine<source_type> base_type;
typedef typename base_type::interpolator_type interpolator_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::long_type long_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask,
downscale_shift = image_filter_shift
};
//--------------------------------------------------------------------
span_image_resample_rgba_affine() {}
span_image_resample_rgba_affine(source_type& src,
interpolator_type& inter,
const image_filter_lut& filter) :
base_type(src, inter, filter)
{}
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
long_type fg[4];
int diameter = base_type::filter().diameter();
int filter_scale = diameter << image_subpixel_shift;
int radius_x = (diameter * base_type::m_rx) >> 1;
int radius_y = (diameter * base_type::m_ry) >> 1;
int len_x_lr =
(diameter * base_type::m_rx + image_subpixel_mask) >>
image_subpixel_shift;
const boost::int16_t* weight_array = base_type::filter().weight_array();
do
{
base_type::interpolator().coordinates(&x, &y);
x += base_type::filter_dx_int() - radius_x;
y += base_type::filter_dy_int() - radius_y;
fg[0] = fg[1] = fg[2] = fg[3] = image_filter_scale / 2;
int y_lr = y >> image_subpixel_shift;
int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) *
base_type::m_ry_inv) >>
image_subpixel_shift;
int total_weight = 0;
int x_lr = x >> image_subpixel_shift;
int x_hr = ((image_subpixel_mask - (x & image_subpixel_mask)) *
base_type::m_rx_inv) >>
image_subpixel_shift;
int x_hr2 = x_hr;
const value_type* fg_ptr =
(const value_type*)base_type::source().span(x_lr, y_lr, len_x_lr);
for(;;)
{
int weight_y = weight_array[y_hr];
x_hr = x_hr2;
for(;;)
{
int weight = (weight_y * weight_array[x_hr] +
image_filter_scale / 2) >>
downscale_shift;
fg[0] += *fg_ptr++ * weight;
fg[1] += *fg_ptr++ * weight;
fg[2] += *fg_ptr++ * weight;
fg[3] += *fg_ptr * weight;
total_weight += weight;
x_hr += base_type::m_rx_inv;
if(x_hr >= filter_scale) break;
fg_ptr = (const value_type*)base_type::source().next_x();
}
y_hr += base_type::m_ry_inv;
if(y_hr >= filter_scale) break;
fg_ptr = (const value_type*)base_type::source().next_y();
}
if (total_weight)
{
fg[3] /= total_weight;
fg[0] /= total_weight;
fg[1] /= total_weight;
fg[2] /= total_weight;
if(fg[0] < 0) fg[0] = 0;
if(fg[1] < 0) fg[1] = 0;
if(fg[2] < 0) fg[2] = 0;
if(fg[3] < 0) fg[3] = 0;
}
else
{
fg[0] = 0;
fg[1] = 0;
fg[2] = 0;
fg[3] = 0;
}
if(fg[order_type::R] > base_mask) fg[order_type::R] = base_mask;
if(fg[order_type::G] > base_mask) fg[order_type::G] = base_mask;
if(fg[order_type::B] > base_mask) fg[order_type::B] = base_mask;
if(fg[order_type::A] > base_mask) fg[order_type::A] = base_mask;
span->r = (value_type)fg[order_type::R];
span->g = (value_type)fg[order_type::G];
span->b = (value_type)fg[order_type::B];
span->a = (value_type)fg[order_type::A];
++span;
++base_type::interpolator();
} while(--len);
}
};
}
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