/usr/include/mapnik/image_null.hpp is in libmapnik-dev 3.0.12+ds-3.
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) 2015 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
*
*****************************************************************************/
#ifndef MAPNIK_IMAGE_NULL_HPP
#define MAPNIK_IMAGE_NULL_HPP
// mapnik
#include <mapnik/config.hpp>
#include <mapnik/image.hpp>
#include <mapnik/pixel_types.hpp>
//stl
#include <stdexcept>
namespace mapnik
{
template <>
class MAPNIK_DECL image<null_t>
{
public:
using pixel_type = null_t::type;
static const image_dtype dtype = null_t::id;
private:
public:
image() {}
image(int /*width*/,
int /*height*/,
bool /*initialize*/ = true,
bool /*premultiplied*/ = false,
bool /*painted*/ = false) {}
bool operator==(image<null_t> const&) const { return true; }
bool operator<(image<null_t> const&) const { return false; }
std::size_t width() const { return 0; }
std::size_t height() const { return 0; }
std::size_t size() const { return 0; }
std::size_t row_size() const { return 0; }
void set(pixel_type const&) { throw std::runtime_error("Can not set values for null image"); }
pixel_type& operator() (std::size_t, std::size_t) { throw std::runtime_error("Can not get or set values for null image"); }
pixel_type const& operator() (std::size_t, std::size_t) const { throw std::runtime_error("Can not get or set values for null image"); }
unsigned const char* bytes() const { return nullptr; }
unsigned char* bytes() {return nullptr; }
double get_offset() const { return 0.0; }
void set_offset(double) {}
double get_scaling() const { return 1.0; }
void set_scaling(double) {}
bool get_premultiplied() const { return false; }
void set_premultiplied(bool) {}
void painted(bool) {}
bool painted() const { return false; }
image_dtype get_dtype() const { return dtype; }
};
} // end ns mapnik
#endif // MAPNIK_IMAGE_NULL_HPP
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