otbBlendingImageFilter.h

Go to the documentation of this file.

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

  Program:   ORFEO Toolbox
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
  See OTBCopyright.txt 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 __otbBlendingImageFilter_h
#define __otbBlendingImageFilter_h

#include "itkBinaryFunctorImageFilter.h"
#include "otbUniformAlphaBlendingFunction.h"
#include "otbImage.h"
#include "itkRGBAPixel.h"

namespace otb
{
namespace Functor
{
template <class TInputPixel1, class TInputPixel2, class TOutputPixel>
class BlendingFunctor
{
public:
  typedef otb::Function::BlendingFunction<TInputPixel1,
      TInputPixel2, TOutputPixel>          BlendingFunctionType;
  typedef typename BlendingFunctionType::Pointer BlendingFunctionPointerType;
  typedef otb::Function::UniformAlphaBlendingFunction<TInputPixel1,
      TInputPixel2, TOutputPixel>          DefaultBlendingFunctionType;

  inline TOutputPixel operator ()(const TInputPixel1& input1, const TInputPixel2& input2)
  {
    return m_Function->Evaluate(input1, input2);
  }

  BlendingFunctor()
  {
    // Default rendering function
    m_Function = DefaultBlendingFunctionType::New();
  }

  virtual ~BlendingFunctor(){}

  void SetFunction(BlendingFunctionType * function)
  {
    m_Function = function;
  }

  BlendingFunctionType * GetFunction(void)
  {
    return m_Function;
  }

private:
  BlendingFunctionPointerType m_Function;
};
} // end namespace Functor

template <class TInputImage1, class TInputImage2 = TInputImage1, class TOutputImage = TInputImage1>
class BlendingImageFilter
  : public itk::BinaryFunctorImageFilter<TInputImage1, TInputImage2, TOutputImage,
      Functor::BlendingFunctor
      <typename TInputImage1::PixelType,
          typename TInputImage2::PixelType,
          typename TOutputImage::PixelType> >
{
public:
  typedef BlendingImageFilter Self;
  typedef itk::BinaryFunctorImageFilter
  <TInputImage1, TInputImage2, TOutputImage, Functor::BlendingFunctor
      <typename TInputImage1::PixelType,
          typename TInputImage2::PixelType,
          typename TOutputImage::PixelType> >                        Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(BlendingImageFilter, itk::BinaryFunctorImageFilter);

  typedef Functor::BlendingFunctor
  <typename TInputImage1::PixelType,
      typename TInputImage2::PixelType,
      typename TOutputImage::PixelType>                       BlendingFunctorType;
  typedef typename BlendingFunctorType::BlendingFunctionType BlendingFunctionType;

  void SetBlendingFunction(BlendingFunctionType * function)
  {
    if (function != this->GetFunctor().GetFunction())
      {
      this->GetFunctor().SetFunction(function);
      this->Modified();
      }
  }

  BlendingFunctionType * GetBlendingFunction(void)
  {
    return this->GetFunctor().GetFunction();
  }

protected:
  BlendingImageFilter() {}
  virtual ~BlendingImageFilter() {}

private:
  BlendingImageFilter(const Self&); //purposely not implemented
  void operator =(const Self&); //purposely not implemented
};
} // end namespace otb

#endif