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pngio.h

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00001 
00005 /*
00006  * Author: Steven Ludtke, 04/10/2003 (sludtke@bcm.edu)
00007  * Copyright (c) 2000-2006 Baylor College of Medicine
00008  * 
00009  * This software is issued under a joint BSD/GNU license. You may use the
00010  * source code in this file under either license. However, note that the
00011  * complete EMAN2 and SPARX software packages have some GPL dependencies,
00012  * so you are responsible for compliance with the licenses of these packages
00013  * if you opt to use BSD licensing. The warranty disclaimer below holds
00014  * in either instance.
00015  * 
00016  * This complete copyright notice must be included in any revised version of the
00017  * source code. Additional authorship citations may be added, but existing
00018  * author citations must be preserved.
00019  * 
00020  * This program is free software; you can redistribute it and/or modify
00021  * it under the terms of the GNU General Public License as published by
00022  * the Free Software Foundation; either version 2 of the License, or
00023  * (at your option) any later version.
00024  * 
00025  * This program is distributed in the hope that it will be useful,
00026  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00027  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
00028  * GNU General Public License for more details.
00029  * 
00030  * You should have received a copy of the GNU General Public License
00031  * along with this program; if not, write to the Free Software
00032  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
00033  * 
00034  * */
00035 
00036 #ifndef eman__pngio_h__
00037 #define eman__pngio_h__ 1
00038 
00039 #ifdef EM_PNG
00040 
00041 #include <png.h>
00042 #include "imageio.h"
00043 
00044 
00045 namespace EMAN
00046 {
00050         class PngIO:public ImageIO
00051         {
00052           public:
00053                 explicit PngIO(const string & filename, IOMode rw_mode = READ_ONLY);
00054                 ~PngIO();
00055 
00056                 DEFINE_IMAGEIO_FUNC;
00057                 static bool is_valid(const void *first_block);
00058 
00059           private:
00060                 enum
00061                 {
00062                         PNG_BYTES_TO_CHECK = 8
00063                 };
00064 
00065                 enum BitDepthType
00066                 {
00067                         PNG_CHAR_DEPTH,
00068                         PNG_SHORT_DEPTH,
00069                         PNG_INVALID_DEPTH
00070                 };
00071 
00072           private:
00073                 string filename;
00074                 IOMode rw_mode;
00075                 FILE *png_file;
00076 
00077                 bool initialized;
00078 
00079                 png_structp png_ptr;
00080                 png_infop info_ptr;
00081                 png_infop end_info;
00082 
00083                 png_uint_32 nx;
00084                 png_uint_32 ny;
00085                 BitDepthType depth_type;
00086                 int number_passes;
00087                 
00088                 float rendermin;
00089                 float rendermax;
00090         };
00091 
00092 }
00093 
00094 #endif  //EM_PNG
00095 
00096 #endif  //eman__pngio_h__

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