text: /*=========================================================================
   *
   *  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 itkNoiseBaseImageFilter_h
  #define itkNoiseBaseImageFilter_h
  
  #include "itkInPlaceImageFilter.h"
  #if !defined( ITK_LEGACY_FUTURE_REMOVE )
  # include <vcl_ctime.h>
  #endif
  #include <ctime>
  
  namespace itk
  {
  
  /** \class NoiseBaseImageFilter
   *
   * \brief An Abstract Base class for Noise image filters
   *
   * This class add common methods for setting a seed for the random
   * generators used to generate the noise.
   *
   * \sa InPlaceImageFilter
   * \ingroup ITKImageNoise
   */
  template <class TInputImage, class TOutputImage=TInputImage>
  class NoiseBaseImageFilter :
    public InPlaceImageFilter<TInputImage,TOutputImage >
  {
  public:
    /** Standard class typedefs. */
    typedef NoiseBaseImageFilter                          Self;
    typedef InPlaceImageFilter<TInputImage,TOutputImage > Superclass;
    typedef SmartPointer<Self>                            Pointer;
    typedef SmartPointer<const Self>                      ConstPointer;
  
    typedef typename Superclass::OutputImagePixelType OutputImagePixelType;
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(NoiseBaseImageFilter, InPlaceImageFilter);
  
    /** Seed for random initialization  */
    itkGetConstMacro(Seed, uint32_t);
    itkSetMacro(Seed, uint32_t);
  
    /** Set the seed to a value initialized with the current time and
     * process clock. */
    virtual void SetSeed();
  
  protected:
    NoiseBaseImageFilter();
  
    virtual ~NoiseBaseImageFilter() = 0;
  
    void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
  
    inline static uint32_t Hash(uint32_t a, uint32_t b)
    {
      //  Knuth's Multiplicative Method for hashing
      return (a+b)*2654435761u;
    }
  
    // Clamp and round the input value to the output
    static OutputImagePixelType ClampCast(const double &value);
  
  private:
    NoiseBaseImageFilter(const Self&) ITK_DELETE_FUNCTION;
    void operator=(const Self&) ITK_DELETE_FUNCTION;
  
    uint32_t m_Seed;
  
  };
  
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #include "itkNoiseBaseImageFilter.hxx"
  #endif
  
  #endif //  itkNoiseBaseImageFilter_h
  