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haar_int.h

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#ifndef _HAAR_INT_H_
#define _HAAR_INT_H_



#include "stdio.h"
#include "liftbase.h"



class haar_int : public liftbase<int *, int>
{
public:
  haar_int() {}
  ~haar_int() {} 
  haar_int( const haar_int &rhs );

protected:

  void predict( int *& vec, int N, transDirection direction )
  {
    int half = N >> 1;

    for (int i = 0; i < half; i++) {
      int predictVal = vec[i];
      int j = i + half;

      if (direction == forward) {
        vec[j] = vec[j] - predictVal;
      }
      else if (direction == inverse) {
        vec[j] = vec[j] + predictVal;
      }
      else {
        printf("haar_int::predict: bad direction value\n");
      }
    }    
  } // predict

  void update( int *& vec, int N, transDirection direction )
  {
    int half = N >> 1;

    for (int i = 0; i < half; i++) {
      int j = i + half;
      // updateVal = floor( vec[j] / 2.0 )
      int updateVal = vec[j] >> 1;

      if (direction == forward) {
        vec[i] = vec[i] + updateVal;
      }
      else if (direction == inverse) {
        vec[i] = vec[i] - updateVal;
      }
      else {
        printf("update_int: bad direction value\n");
      }
    }    
  } // update

}; // haar_int


#endif

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