80 lines
2.5 KiB
C++
80 lines
2.5 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) 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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#ifndef MAPNIK_IMAGE_READER_HPP
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#define MAPNIK_IMAGE_READER_HPP
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// mapnik
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#include <mapnik/image_any.hpp>
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#include <mapnik/config.hpp>
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#include <mapnik/util/noncopyable.hpp>
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#include <mapnik/factory.hpp>
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#include <mapnik/box2d.hpp>
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// boost
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#include <boost/optional.hpp>
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// stl
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#include <stdexcept>
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#include <string>
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namespace mapnik
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{
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class image_reader_exception : public std::exception
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{
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private:
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std::string message_;
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public:
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image_reader_exception(std::string const& message)
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: message_(message) {}
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~image_reader_exception() throw() {}
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virtual const char* what() const throw()
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{
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return message_.c_str();
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}
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};
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struct MAPNIK_DECL image_reader : private util::noncopyable
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{
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virtual unsigned width() const = 0;
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virtual unsigned height() const = 0;
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virtual bool has_alpha() const = 0;
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virtual boost::optional<box2d<double> > bounding_box() const = 0;
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virtual void read(unsigned x,unsigned y,image_rgba8& image) = 0;
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virtual image_any read(unsigned x, unsigned y, unsigned width, unsigned height) = 0;
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virtual ~image_reader() {}
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};
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template <typename...Args>
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bool register_image_reader(std::string const& type, image_reader* (* fun)(Args...))
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{
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return factory<image_reader,std::string, Args...>::instance().register_product(type, fun);
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}
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MAPNIK_DECL image_reader* get_image_reader(std::string const& file, std::string const& type);
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MAPNIK_DECL image_reader* get_image_reader(std::string const& file);
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MAPNIK_DECL image_reader* get_image_reader(char const* data, size_t size);
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}
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#endif // MAPNIK_IMAGE_READER_HPP
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