mapnik/include/image_reader.hpp

/*****************************************************************************
* 
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2006 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
*
*****************************************************************************/

//$Id: image_reader.hpp 39 2005-04-10 20:39:53Z pavlenko $

#ifndef IMAGE_READER_HPP
#define IMAGE_READER_HPP

#include <stdexcept>
#include <string>

#include "image_data.hpp"
#include "config.hpp"


namespace mapnik 
{
    class ImageReaderException : public std::exception
    {
    private:
        std::string message_;
    public:
        ImageReaderException(const std::string& message) 
            : message_(message) {}

        ~ImageReaderException() throw() {}

        virtual const char* what() const throw()
        {
            return message_.c_str();
        }
    };

    struct MAPNIK_DECL ImageReader
    {
        virtual unsigned width() const=0;
        virtual unsigned height() const=0;
        virtual void read(unsigned x,unsigned y,ImageData32& image)=0;
        virtual ~ImageReader() {}
    };

    bool register_image_reader(const std::string& type,ImageReader* (*)(const std::string&));
    MAPNIK_DECL ImageReader* get_image_reader(const std::string& type,const std::string& file);

}

#endif                                            //IMAGE_READER_HPP