GnashImageGif.h

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// GnashImageGif.h: gif_lib wrapper for Gnash.
// 
//   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Free Software
//   Foundation, Inc
// 
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// 
// This program 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 General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
//

#ifndef GNASH_IMAGE_GIF_H
#define GNASH_IMAGE_GIF_H

#include <memory>

#include "dsodefs.h"
#include "GnashImage.h"
#include <boost/scoped_array.hpp>
#include <boost/shared_ptr.hpp>

extern "C" {
#include <gif_lib.h>
}

// Forward declarations
namespace gnash { class IOChannel; }

namespace gnash {
namespace image {

class GifInput : public Input
{

public:

    //
    GifInput(boost::shared_ptr<IOChannel> in);
    
    ~GifInput();

    void read();

    //
    size_t getHeight() const;

    //
    size_t getWidth() const;

    //
    size_t getComponents() const { return 3; }

    //
    void readScanline(unsigned char* rgb_data);


    //
    DSOEXPORT static std::auto_ptr<Input> create(
            boost::shared_ptr<IOChannel> in)
    {
        std::auto_ptr<Input> ret ( new GifInput(in) );
        if ( ret.get() ) ret->read();
        return ret;
    }

private:
    
    void init();

    // State needed for input.
    GifFileType* _gif;
    
    // A counter for keeping track of the last row copied.
    size_t _currentRow;
    
    typedef boost::scoped_array<GifPixelType> PixelRow;

    // A 2-dimensional scoped array holding the unpacked pixel data.
    boost::scoped_array<PixelRow> _gifData;



};

} // namespace image
} // namespace gnash


#endif