SphinxExamples/src/Bridge/VtkGlue/ConvertRGBvtkImageDataToAnitkImage/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 "vtkSmartPointer.h"
#include "vtkPNGReader.h"
#include "itkVTKImageToImageFilter.h"
#include "itkRGBPixel.h"
 
int
main(int argc, char * argv[])
{
  if (argc != 2)
  {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0];
    std::cerr << " <InputFileName>";
    std::cerr << std::endl;
    return EXIT_FAILURE;
  }
 
  const char * inputFileName = argv[1];
 
  constexpr unsigned int Dimension = 2;
 
  using PixelComponentType = unsigned char;
  using PixelType = itk::RGBPixel<PixelComponentType>;
  using ImageType = itk::Image<PixelType, Dimension>;
 
  vtkSmartPointer<vtkPNGReader> reader = vtkSmartPointer<vtkPNGReader>::New();
  reader->SetFileName(inputFileName);
  reader->SetDataScalarTypeToUnsignedChar();
 
  using FilterType = itk::VTKImageToImageFilter<ImageType>;
  auto filter = FilterType::New();
  filter->SetInput(reader->GetOutput());
 
  try
  {
    reader->Update();
    filter->Update();
  }
  catch (const itk::ExceptionObject & error)
  {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
  }
 
  ImageType::ConstPointer myitkImage = filter->GetOutput();
  myitkImage->Print(std::cout);
 
  return EXIT_SUCCESS;
}