IntegerResample.h

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//     ____   ______ __
//    / __ \ / ____// /
//   / /_/ // /    / /
//  / ____// /___ / /___   PixInsight Class Library
// /_/     \____//_____/   PCL 2.4.7
// ----------------------------------------------------------------------------
// pcl/IntegerResample.h - Released 2020-12-17T15:46:29Z
// ----------------------------------------------------------------------------
// This file is part of the PixInsight Class Library (PCL).
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// ----------------------------------------------------------------------------

#ifndef __PCL_IntegerResample_h
#define __PCL_IntegerResample_h


#include <pcl/Defs.h>
#include <pcl/Diagnostics.h>

#include <pcl/GeometricTransformation.h>

namespace pcl
{

// ----------------------------------------------------------------------------

namespace IntegerDownsampleMode
{
   enum value_type
   {
      Average,
      Median,
      Maximum,
      Minimum
   };
}

// ----------------------------------------------------------------------------

class PCL_CLASS IntegerResample : public GeometricTransformation
{
public:

   typedef IntegerDownsampleMode::value_type downsample_mode;

   IntegerResample( int zoom = 0, downsample_mode mode = IntegerDownsampleMode::Average )
      : m_zoomFactor( zoom )
      , m_downsampleMode( mode )
   {
   }

   IntegerResample( const IntegerResample& ) = default;

   int ZoomFactor() const
   {
      return m_zoomFactor;
   }

   void SetZoomFactor( int zoom )
   {
      m_zoomFactor = (zoom < -1 || zoom > +1) ? zoom : +1;
   }

   double ScalingFactor() const
   {
      if ( m_zoomFactor == 0 )
         return 1;
      return (m_zoomFactor < 0) ? 1.0/(-m_zoomFactor) : double( m_zoomFactor );
   }

   downsample_mode DownsampleMode() const
   {
      return m_downsampleMode;
   }

   void SetDownsampleMode( downsample_mode mode )
   {
      m_downsampleMode = mode;
   }

   void GetNewSizes( int& width, int& height ) const override;

protected:

   /*
    * Zoom factor: > 1 -> zoom in, < 1 -> zoom out, from -1 to +1 -> no change.
    */
   int m_zoomFactor = 0;

   /*
    * Downsample mode: average, median, maximum, minimum; see enumeration above.
    */
   downsample_mode m_downsampleMode = IntegerDownsampleMode::Average;

   // Inherited from ImageTransformation.
   void Apply( pcl::Image& ) const override;
   void Apply( pcl::DImage& ) const override;
   void Apply( pcl::UInt8Image& ) const override;
   void Apply( pcl::UInt16Image& ) const override;
   void Apply( pcl::UInt32Image& ) const override;
};

// ----------------------------------------------------------------------------

} // pcl

#endif   // __PCL_IntegerResample_h

// ----------------------------------------------------------------------------
// EOF pcl/IntegerResample.h - Released 2020-12-17T15:46:29Z