text: /*=========================================================================
   *
   *  Copyright NumFOCUS
   *
   *  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 itkRieszFrequencyFilterBankGenerator_hxx
  #define itkRieszFrequencyFilterBankGenerator_hxx
  #include "itkRieszFrequencyFilterBankGenerator.h"
  #include "itkNumericTraits.h"
  
  namespace itk
  {
  template <typename TOutputImage, typename TRieszFunction, typename TFrequencyRegionIterator>
  RieszFrequencyFilterBankGenerator<TOutputImage, TRieszFunction, TFrequencyRegionIterator>::
    RieszFrequencyFilterBankGenerator()
  
  {
    this->m_Evaluator = RieszFunctionType::New();
    this->SetOrder(1);
  }
  
  template <typename TOutputImage, typename TRieszFunction, typename TFrequencyRegionIterator>
  void
  RieszFrequencyFilterBankGenerator<TOutputImage, TRieszFunction, TFrequencyRegionIterator>::PrintSelf(
    std::ostream & os,
    Indent         indent) const
  {
    Superclass::PrintSelf(os, indent);
    os << indent << "m_Order: " << this->m_Order << std::endl;
    itkPrintSelfObjectMacro(Evaluator);
  }
  
  /* ******* Get Outputs *****/
  template <typename TOutputImage, typename TRieszFunction, typename TFrequencyRegionIterator>
  typename RieszFrequencyFilterBankGenerator<TOutputImage, TRieszFunction, TFrequencyRegionIterator>::OutputsType
  RieszFrequencyFilterBankGenerator<TOutputImage, TRieszFunction, TFrequencyRegionIterator>::GetOutputs()
  {
    OutputsType outputList;
    for (unsigned int comp = 0; comp < this->GetNumberOfOutputs(); ++comp)
    {
      outputList.push_back(this->GetOutput(comp));
    }
    return outputList;
  }
  
  template <typename TOutputImage, typename TRieszFunction, typename TFrequencyRegionIterator>
  void
  RieszFrequencyFilterBankGenerator<TOutputImage, TRieszFunction, TFrequencyRegionIterator>::BeforeThreadedGenerateData()
  {
    /***************** Allocate Outputs *****************/
    OutputImageType * firstOutput = this->GetOutput(0);
    for (unsigned int comp = 0; comp < this->GetNumberOfOutputs(); ++comp)
    {
      OutputImageType * outputPtr = this->GetOutput(comp);
      outputPtr->SetRegions(firstOutput->GetLargestPossibleRegion());
      outputPtr->Allocate();
      outputPtr->FillBuffer(0);
    }
  }
  
  template <typename TOutputImage, typename TRieszFunction, typename TFrequencyRegionIterator>
  void
  RieszFrequencyFilterBankGenerator<TOutputImage, TRieszFunction, TFrequencyRegionIterator>::DynamicThreadedGenerateData(
    const OutputImageRegionType & threadRegion)
  {
    // Init iterators for all outputs.
    std::vector<OutputRegionIterator> outputItList;
    for (unsigned int comp = 0; comp < this->GetNumberOfOutputs(); ++comp)
    {
      OutputImageType * outputPtr = this->GetOutput(comp);
      outputItList.push_back(OutputRegionIterator(outputPtr, threadRegion));
      outputItList.back().GoToBegin();
    }
  
    /***************** Set Outputs *****************/
    OutputImageType *    firstOutput = this->GetOutput(0);
    OutputRegionIterator frequencyIt(firstOutput, threadRegion);
    for (frequencyIt.GoToBegin(); !frequencyIt.IsAtEnd(); ++frequencyIt)
    {
      typename TRieszFunction::OutputComponentsType evaluatedArray =
        this->m_Evaluator->EvaluateAllComponents(frequencyIt.GetFrequency());
      for (unsigned int comp = 0; comp < this->GetNumberOfOutputs(); ++comp)
      {
        outputItList[comp].Set(static_cast<typename OutputImageType::PixelType>(evaluatedArray[comp]));
        ++outputItList[comp];
      }
      itkDebugMacro(<< "w_vector: " << frequencyIt.GetFrequency() << " w2: " << frequencyIt.GetFrequencyModuloSquare()
                    << "  frequencyItIndex: "
                    << frequencyIt.GetIndex()
                    // << "  Evaluated Riesz Components: " << evaluatedArray
                    << " outputIndex: " << outputItList[0].GetIndex());
    }
  }
  } // end namespace itk
  #endif
  