pngio.h

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/*
 * Author: Steven Ludtke, 04/10/2003 (sludtke@bcm.edu)
 * Copyright (c) 2000-2006 Baylor College of Medicine
 * 
 * This software is issued under a joint BSD/GNU license. You may use the
 * source code in this file under either license. However, note that the
 * complete EMAN2 and SPARX software packages have some GPL dependencies,
 * so you are responsible for compliance with the licenses of these packages
 * if you opt to use BSD licensing. The warranty disclaimer below holds
 * in either instance.
 * 
 * This complete copyright notice must be included in any revised version of the
 * source code. Additional authorship citations may be added, but existing
 * author citations must be preserved.
 * 
 * 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 2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * */
 
#ifndef eman__pngio_h__
#define eman__pngio_h__ 1
 
#ifdef USE_PNG
 
#include <png.h>
#include "imageio.h"
 
 
namespace EMAN
{
        class PngIO : public ImageIO
        {
          public:
                explicit PngIO(const string & fname, IOMode rw_mode = READ_ONLY);
                ~PngIO();
 
                DEFINE_IMAGEIO_FUNC;
                static bool is_valid(const void *first_block);
 
          private:
                enum
                {
                        PNG_BYTES_TO_CHECK = 8
                };
 
                enum BitDepthType
                {
                        PNG_CHAR_DEPTH,
                        PNG_SHORT_DEPTH,
                        PNG_INVALID_DEPTH
                };
 
          private:
                png_structp png_ptr;
                png_infop info_ptr;
                png_infop end_info;
 
                png_uint_32 nx;
                png_uint_32 ny;
                BitDepthType depth_type;
                int number_passes;
                
                float rendermin;
                float rendermax;
                int renderbits;
        };
 
}
 
#endif  //USE_PNG
 
#endif  //eman__pngio_h__