text: /*M///////////////////////////////////////////////////////////////////////////////////////
  //
  //  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
  //
  //  By downloading, copying, installing or using the software you agree to this license.
  //  If you do not agree to this license, do not download, install,
  //  copy or use the software.
  //
  //
  //                        Intel License Agreement
  //                For Open Source Computer Vision Library
  //
  // Copyright (C) 2000, Intel Corporation, all rights reserved.
  // Third party copyrights are property of their respective owners.
  //
  // Redistribution and use in source and binary forms, with or without modification,
  // are permitted provided that the following conditions are met:
  //
  //   * Redistribution's of source code must retain the above copyright notice,
  //     this list of conditions and the following disclaimer.
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  //   * Redistribution's in binary form must reproduce the above copyright notice,
  //     this list of conditions and the following disclaimer in the documentation
  //     and/or other materials provided with the distribution.
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  //     derived from this software without specific prior written permission.
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  // In no event shall the Intel Corporation or contributors be liable for any direct,
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  // (including, but not limited to, procurement of substitute goods or services;
  // loss of use, data, or profits; or business interruption) however caused
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  //M*/
  
  #ifndef _GRFMT_PNG_H_
  #define _GRFMT_PNG_H_
  
  //#ifdef HAVE_PNG
  
  #include "grfmt_base.h"
  #include "bitstrm.h"
  
  /* libpng version only */
  
  class GrFmtPngReader : public GrFmtReader
  {
  public:
      
      GrFmtPngReader( const char* filename );
      ~GrFmtPngReader();
  
      bool  CheckFormat( const char* signature );
      bool  ReadData( uchar* data, int step, int color );
      bool  ReadHeader();
      void  Close();
  
  protected:
  
      void* m_png_ptr;  // pointer to decompression structure
      void* m_info_ptr; // pointer to image information structure
      void* m_end_info; // pointer to one more image information structure
      FILE* m_f;
      int   m_color_type;
  };
  
  
  class GrFmtPngWriter : public GrFmtWriter
  {
  public:
      
      GrFmtPngWriter( const char* filename );
      ~GrFmtPngWriter();
  
      bool  IsFormatSupported( int depth );
      bool  WriteImage( const uchar* data, int step,
                        int width, int height, int depth, int channels );
  protected:
  };
  
  
  // PNG filter factory
  class GrFmtPng : public GrFmtFilterFactory
  {
  public:
      
      GrFmtPng();
      ~GrFmtPng();
  
      GrFmtReader* NewReader( const char* filename );
      GrFmtWriter* NewWriter( const char* filename );
      bool CheckSignature( const char* signature );
  };
  
  //#endif
  
  #endif/*_GRFMT_PNG_H_*/
  