itkLabelOverlayFunctor.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkLabelOverlayFunctor.h,v $
  Language:  C++
  Date:      $Date: 2009-02-24 19:03:15 $
  Version:   $Revision: 1.3 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/

#ifndef __itkLabelOverlayFunctor_h
#define __itkLabelOverlayFunctor_h

#include "itkLabelToRGBFunctor.h"

namespace itk
{

namespace Functor {
 
template< class TInputPixel, class TLabel, class TRGBPixel >
class LabelOverlayFunctor
{
public:
  LabelOverlayFunctor() 
    {
    // provide some default value for external use (outside 
    // LabelOverlayFunctorImageFilter) Inside LabelOverlayFunctorImageFilter, 
    // the values are always initialized
    m_BackgroundValue = NumericTraits<TLabel>::Zero;
    }

  inline TRGBPixel operator()(  const TInputPixel & p1, const TLabel & p2) const
    {
    TRGBPixel rgbPixel;
    if( p2 == m_BackgroundValue )
      {
      // value is background
      // return a gray pixel with the same intensity than the input pixel
      typename TRGBPixel::ValueType p = 
                        static_cast< typename TRGBPixel::ValueType >( p1 );
      rgbPixel[0] = p;
      rgbPixel[1] = p;
      rgbPixel[2] = p;
      return rgbPixel;
      }

    // taint the input pixel with the colored one returned by 
    // the color functor.
    TRGBPixel opaque = m_RGBFunctor(p2);
    for( unsigned int i = 0; i<3; i++ )
      {
      rgbPixel[i] = static_cast< typename TRGBPixel::ValueType >( 
                          opaque[i] * m_Opacity + p1 * ( 1.0 - m_Opacity ) );
      }
    return rgbPixel;
    }

  bool operator != (const LabelOverlayFunctor &l) const
    {
    bool value = l.m_Opacity != m_Opacity || 
                 m_BackgroundValue != l.m_BackgroundValue; 

    return value;
    }

  ~LabelOverlayFunctor() {}

  void SetOpacity( double opacity ) 
    { 
    m_Opacity = opacity; 
    }

  void SetBackgroundValue( TLabel v ) 
    { 
    m_BackgroundValue = v; 
    m_RGBFunctor.SetBackgroundValue( v );
    }

protected:

private: 
  double          m_Opacity;
  TLabel          m_BackgroundValue;

  typename Functor::LabelToRGBFunctor<TLabel, TRGBPixel> m_RGBFunctor;
};

}  // end namespace functor

}  // end namespace itk

#endif