IntegerResample.h

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//     ____   ______ __
//    / __ \ / ____// /
//   / /_/ // /    / /
//  / ____// /___ / /___   PixInsight Class Library
// /_/     \____//_____/   PCL 2.7.0
// ----------------------------------------------------------------------------
// pcl/IntegerResample.h - Released 2024-06-18T15:48:54Z
// ----------------------------------------------------------------------------
// 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 ParallelProcess
{
public:
 
   using downsample_mode = IntegerDownsampleMode::value_type;
 
   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;
 
   bool SupportsGammaCorrection() const override
   {
      return true;
   }
 
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 2024-06-18T15:48:54Z