BilinearInterpolation.h

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//     ____   ______ __
//    / __ \ / ____// /
//   / /_/ // /    / /
//  / ____// /___ / /___   PixInsight Class Library
// /_/     \____//_____/   PCL 2.6.5
// ----------------------------------------------------------------------------
// pcl/BilinearInterpolation.h - Released 2024-01-13T15:47:58Z
// ----------------------------------------------------------------------------
// This file is part of the PixInsight Class Library (PCL).
// PCL is a multiplatform C++ framework for development of PixInsight modules.
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// ----------------------------------------------------------------------------
 
#ifndef __PCL_BilinearInterpolation_h
#define __PCL_BilinearInterpolation_h
 
 
#include <pcl/Defs.h>
#include <pcl/Diagnostics.h>
 
#include <pcl/BidimensionalInterpolation.h>
#include <pcl/Utility.h>
 
namespace pcl
{
 
// ----------------------------------------------------------------------------
 
#define m_width      this->m_width
#define m_height     this->m_height
#define m_fillBorder this->m_fillBorder
#define m_fillValue  this->m_fillValue
#define m_data       this->m_data
 
// ----------------------------------------------------------------------------
 
template <typename T>
class PCL_CLASS BilinearInterpolation : public BidimensionalInterpolation<T>
{
public:
 
   BilinearInterpolation() = default;
 
   BilinearInterpolation( const BilinearInterpolation& ) = default;
 
   ~BilinearInterpolation() override
   {
   }
 
   double operator()( double x, double y ) const override
   {
      PCL_PRECONDITION( m_data != nullptr )
      PCL_PRECONDITION( m_width > 0 && m_height > 0 )
 
      int j0 = pcl::Range( TruncInt( x ), 0, m_width-1 );
      int i0 = pcl::Range( TruncInt( y ), 0, m_height-1 );
 
      int j1 = j0 + 1;
      int i1 = i0 + 1;
 
      double p00, p10, p01, p11;
      const T* fp = m_data + (int64( i0 )*m_width + j0);
 
      p00 = *fp;
      p10 = (j1 < m_width) ? fp[1] : (m_fillBorder ? m_fillValue : *fp);
 
      if ( i1 < m_height )
         fp += m_width;
      else if ( m_fillBorder )
      {
         p01 = p11 = m_fillValue;
         goto __1;
      }
 
      p01 = *fp;
      p11 = (j1 < m_width) ? fp[1] : (m_fillBorder ? m_fillValue : *fp);
 
__1:
      double dx = x - j0, dx1 = 1 - dx;
      double dy = y - i0, dy1 = 1 - dy;
      return p00*dx1*dy1 + p10*dx*dy1 + p01*dx1*dy + p11*dx*dy;
   }
};
 
// ----------------------------------------------------------------------------
 
#undef m_width
#undef m_height
#undef m_fillBorder
#undef m_fillValue
#undef m_data
 
// ----------------------------------------------------------------------------
 
} // pcl
 
#endif   // __PCL_BilinearInterpolation_h
 
// ----------------------------------------------------------------------------
// EOF pcl/BilinearInterpolation.h - Released 2024-01-13T15:47:58Z