63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
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/*****************************************************************************
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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) 2014 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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// mapnik
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#include <mapnik/image_convert.hpp>
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#include <mapnik/image_data.hpp>
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#include <mapnik/image_data_any.hpp>
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namespace mapnik
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{
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namespace detail
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{
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template <typename T0>
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struct visitor_convert
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{
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using dst_type = typename T0::pixel_type;
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template <typename T1>
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T0 operator() (T1 const& src)
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{
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T0 dst(src.width(), src.height());
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for (unsigned y = 0; y < dst.height(); ++y)
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{
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for (unsigned x = 0; x < dst.width(); ++x)
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{
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dst(x,y) = static_cast<dst_type>(src(x,y));
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}
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}
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return T0(std::move(dst));
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}
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};
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} // end detail ns
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template <typename T1, typename T2>
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MAPNIK_DECL T2 convert_image(T1 const& data)
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{
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detail::visitor_convert<T2> visit;
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return visit(data);
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}
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} // end mapnik ns
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