SphinxExamples/src/Core/Common/StreamAPipeline/Code.cxx

/*=========================================================================
 *
 *  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
 *
 *         https://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.
 *
 *=========================================================================*/
 
#include "itkPipelineMonitorImageFilter.h"
#include "itkRandomImageSource.h"
#include "itkStreamingImageFilter.h"
 
int
main(int argc, char * argv[])
{
  if (argc != 2)
  {
    std::cerr << "Usage: " << argv[0] << " <NumberOfSplits>" << std::endl;
    return EXIT_FAILURE;
  }
  int numberOfSplits = std::stoi(argv[1]);
 
  constexpr unsigned int Dimension = 2;
  using PixelType = unsigned char;
  using ImageType = itk::Image<PixelType, Dimension>;
 
  using SourceType = itk::RandomImageSource<ImageType>;
  auto source = SourceType::New();
  auto size = ImageType::SizeType::Filled(numberOfSplits);
  source->SetSize(size);
 
  using MonitorFilterType = itk::PipelineMonitorImageFilter<ImageType>;
  auto monitorFilter = MonitorFilterType::New();
  monitorFilter->SetInput(source->GetOutput());
  // If ITK was built with the Debug CMake configuration, the filter
  // automatically outputs status information to the console
  monitorFilter->DebugOn();
 
  using StreamingFilterType = itk::StreamingImageFilter<ImageType, ImageType>;
  auto streamingFilter = StreamingFilterType::New();
  streamingFilter->SetInput(monitorFilter->GetOutput());
  streamingFilter->SetNumberOfStreamDivisions(numberOfSplits);
 
  try
  {
    streamingFilter->Update();
  }
  catch (const itk::ExceptionObject & error)
  {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
  }
 
  std::cout << "The output LargestPossibleRegion is: " << streamingFilter->GetOutput()->GetLargestPossibleRegion()
            << std::endl;
  std::cout << std::endl;
 
  const MonitorFilterType::RegionVectorType updatedRequestedRegions = monitorFilter->GetUpdatedRequestedRegions();
  std::cout << "Updated RequestedRegions's:" << std::endl;
  for (const auto & updatedRequestedRegion : updatedRequestedRegions)
  {
    std::cout << "  " << updatedRequestedRegion << std::endl;
  }
 
  return EXIT_SUCCESS;
}