65 lines
2.4 KiB
C++
65 lines
2.4 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2017 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_IMAGE_VIEW_NULL_HPP
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#define MAPNIK_IMAGE_VIEW_NULL_HPP
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#include <mapnik/image_view.hpp>
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//stl
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#include <stdexcept>
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namespace mapnik {
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template <>
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class MAPNIK_DECL image_view<image_null>
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{
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public:
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using pixel_type = image_null::pixel_type;
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static const image_dtype dtype = image_null::dtype;
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image_view() {}
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~image_view() {};
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image_view(image_view<image_null> const&) {}
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image_view<image_null> & operator=(image_view<image_null> const&) { return *this; }
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bool operator==(image_view<image_null> const&) const { return true; }
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bool operator<(image_view<image_null> const&) const { return false; }
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std::size_t x() const { return 0; }
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std::size_t y() const { return 0; }
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std::size_t width() const { return 0; }
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std::size_t height() const { return 0; }
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pixel_type operator() (std::size_t, std::size_t) const { throw std::runtime_error("Can not get from a null image view"); }
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std::size_t size() const { return 0; }
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std::size_t row_size() const { return 0; }
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const pixel_type* get_row(std::size_t) const { return nullptr; }
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const pixel_type* get_row(std::size_t, std::size_t) const { return nullptr; }
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bool get_premultiplied() const { return false; }
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double get_offset() const { return 0.0; }
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double get_scaling() const { return 1.0; }
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image_dtype get_dtype() const { return dtype; }
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};
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} // end ns
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#endif // MAPNIK_IMAGE_VIEW_NULL_HPP
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