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BufferManager.cpp

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#include <string>
#include "BufferManager.h"

using namespace std;
namespace Isis {
  BufferManager::BufferManager(const int maxsamps,const int maxlines,
                               const int maxbands,const int bufsamps,
                               const int buflines, const int bufbands,
                               const Isis::PixelType type, const bool reverse) :
  Isis::Buffer(bufsamps,buflines,bufbands,type),
  p_maxSamps(maxsamps),p_maxLines(maxlines),
  p_maxBands(maxbands) {
    SetIncrements (bufsamps,buflines,bufbands);
    p_reverse = reverse;
  }

  void BufferManager::SetIncrements(const int sinc, const int linc,
                                    const int binc) {
    p_sinc = sinc;
    p_linc = linc;
    p_binc = binc;

    p_soff = 0;
    p_loff = 0;
    p_boff = 0;

    p_currentSample = p_currentLine = p_currentBand = 1;
    p_currentMap = 0;

    p_nmaps = ( (BigInt) ((p_maxSamps - 1) / p_sinc + 1) *
                (BigInt) ((p_maxLines - 1) / p_linc + 1) *
                (BigInt) ((p_maxBands - 1) / p_binc + 1) );
  }

  void BufferManager::SetOffsets (const int soff, const int loff,
                                  const int boff) {
    p_soff = soff;
    p_loff = loff;
    p_boff = boff;
  }

  bool BufferManager::setpos(const BigInt map) {
    if (map < 0) {
      string message = "Invalid value for argument [map]";
      throw Isis::iException::Message(Isis::iException::Programmer,message,_FILEINFO_);
    }
    if ( p_reverse ) {
      if (p_currentMap+1 == map) {
        p_currentBand += p_binc;
        if (p_currentBand > p_maxBands) {
          p_currentBand = 1;
          p_currentLine += p_linc;
          if (p_currentLine > p_maxLines) {
            p_currentLine = 1;
            p_currentSample += p_sinc;
          }
        }
      } else if (p_currentMap-1 == map) {
        p_currentBand -= p_binc;
        if (p_currentBand < 1) {
          p_currentBand = ((p_maxBands - 1) / p_binc) * p_binc + 1;
          p_currentBand -= p_binc;
          if (p_currentLine < 1) {
            p_currentLine = ((p_maxLines - 1) / p_linc) * p_linc + 1;
            p_currentSample -= p_sinc;
          }
        }
      } else {
        p_currentSample = p_currentLine = p_currentBand = 1;
        if (map < p_nmaps) {
          for (int i=0; i<map; i++) {
            p_currentBand += p_binc;
            if (p_currentBand > p_maxBands) {
              p_currentBand = 1;
              p_currentLine += p_linc;
              if (p_currentLine > p_maxLines) {
                p_currentLine = 1;
                p_currentSample += p_sinc;
              }
            }
          }
        }
      }
    } else { //p_reverse is false
      if (p_currentMap+1 == map) {
        p_currentSample += p_sinc;
        if (p_currentSample > p_maxSamps) {
          p_currentSample = 1;
          p_currentLine += p_linc;
          if (p_currentLine > p_maxLines) {
            p_currentLine = 1;
            p_currentBand += p_binc;
          }
        }
      } else if (p_currentMap-1 == map) {
        p_currentSample -= p_sinc;
        if (p_currentSample < 1) {
          p_currentSample = ((p_maxSamps - 1) / p_sinc) * p_sinc + 1;
          p_currentLine -= p_linc;
          if (p_currentLine < 1) {
            p_currentLine = ((p_maxLines - 1) / p_linc) * p_linc + 1;
            p_currentBand -= p_binc;
          }
        }
      } else {
        p_currentSample = p_currentLine = p_currentBand = 1;
        if (map < p_nmaps) {
          for (int i=0; i<map; i++) {
            p_currentSample += p_sinc;
            if (p_currentSample > p_maxSamps) {
              p_currentSample = 1;
              p_currentLine += p_linc;
              if (p_currentLine > p_maxLines) {
                p_currentLine = 1;
                p_currentBand += p_binc;
              }
            }
          }
        }
      }
    }

    SetBasePosition (p_currentSample + p_soff,
                     p_currentLine + p_loff,
                     p_currentBand + p_boff);

    p_currentMap = map;

    return !end();
  }
} // end namespace isis