PNG.hpp

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#pragma ident "$Id: PNG.hpp 1644 2009-01-27 19:26:14Z ckiesch $"


//============================================================================
//
//  This file is part of GPSTk, the GPS Toolkit.
//
//  The GPSTk 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
//  any later version.
//
//  The GPSTk 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 GPSTk; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//  
//  Copyright 2004, The University of Texas at Austin
//
//============================================================================


#ifndef VDRAW_PNG_H
#define VDRAW_PNG_H

#include<string>
#include<sstream>
#include<cmath>
#include<memory>

#include "Bitmap.hpp"
#include "Color.hpp"
#include "ColorMap.hpp"
#include "InterpolatedColorMap.hpp"
#include "Palette.hpp"
#include "CRC32.hpp"
#include "Adler32.hpp"

namespace vdraw
{

  class PNG
  {
    public:
      typedef std::auto_ptr<std::string> string_ptr;

      static std::string png(const Bitmap &b);

      static string_ptr png(const ColorMap &c, int osr=1, int osc=1);

      static string_ptr png(const InterpolatedColorMap &c, int osr=1, int osc=1);

      static int cost_indexed(const Bitmap& b);

      static int cost_indexed(int rows, int cols, int numcol);

      static int cost_constant(const Bitmap& b);

      static int cost_constant(int rows, int cols);

    protected:
      static const std::string header;

      static int cost_idat(int stream);

      static string_ptr ihdr_full(int width, int height);

      static string_ptr ihdr_indexed(int width, int height);

      static string_ptr srgb();

      static string_ptr phys();

      static string_ptr plte(const InterpolatedColorMap &c);

      /*
       * ZLIB flag information
       * First two bytes:
       * +-----+-----+
       * | CMP | FLG |
       * +-----+-----+
       * CMP:
       *  - Bits 0-3 = 0x08 (deflate compression)
       *  - Bits 4-7 = For CM = 8, CINFO is the base-2 logarithm 
       *    of the LZ77 window size, minus eight
       *
       */

      static string_ptr idat(const InterpolatedColorMap &c, int osr, int osc);

      static string_ptr idat(const ColorMap &c, int osr, int osc);

      static string_ptr split(const std::string &str);

      static string_ptr prefix(const std::string &str);

      static string_ptr huff(const std::string &str);

      static string_ptr data(const ColorMap &c, int osr, int osc);

      static string_ptr data(const InterpolatedColorMap &c, int osr, int osc);

      static unsigned int alder(const string_ptr &str);

      static string_ptr iend();

      static string_ptr chunk(const std::string &title, const std::string &text);

      static string_ptr itos(int i);

      static string_ptr ctos(const Color &color);

      static char btoc(int b);

  }; // class PNG


} // namespace vdraw

#endif //VDRAW_PNG_H

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