itkCastImageFilter.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef __itkCastImageFilter_h
#define __itkCastImageFilter_h

#include "itkUnaryFunctorImageFilter.h"
#include "itkProgressReporter.h"

namespace itk
{
namespace Functor
{
template< class TInput, class TOutput >
class Cast
{
public:
  Cast() {}
  virtual ~Cast() {}
  bool operator!=(const Cast &) const
  {
    return false;
  }

  bool operator==(const Cast & other) const
  {
    return !( *this != other );
  }

  inline TOutput operator()(const TInput & A) const
  {
    return static_cast< TOutput >( A );
  }
};
}

template< class TInputImage, class TOutputImage >
class ITK_EXPORT CastImageFilter:
  public
  UnaryFunctorImageFilter< TInputImage, TOutputImage,
                           Functor::Cast<
                             typename TInputImage::PixelType,
                             typename TOutputImage::PixelType > >
{
public:
  typedef CastImageFilter Self;
  typedef UnaryFunctorImageFilter< TInputImage, TOutputImage,
                                   Functor::Cast<
                                     typename TInputImage::PixelType,
                                     typename TOutputImage::PixelType >
                                   >  Superclass;

  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(CastImageFilter, UnaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro( InputConvertibleToOutputCheck,
                   ( Concept::Convertible< typename TInputImage::PixelType,
                                           typename TOutputImage::PixelType > ) );

#endif
protected:
  CastImageFilter() {}
  virtual ~CastImageFilter() {}

  void GenerateData()
  {
    if ( this->GetInPlace() && this->CanRunInPlace() )
      {
      // nothing to do, so avoid iterating over all the pixels
      // for nothing! Allocate the output, generate a fake progress and exit
      this->AllocateOutputs();
      ProgressReporter progress(this, 0, 1);
      return;
      }
    Superclass::GenerateData();
  }

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

#endif