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/*=========================================================================
*
* 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 <fstream>
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkMetaImageIO.h"
#include "itkTestingMacros.h"
#include <algorithm> // For min.
int
itkMetaImageStreamingWriterIOTest(int argc, char * argv[])
{
if (argc < 3)
{
std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " input output" << std::endl;
return EXIT_FAILURE;
}
// We remove the output file
itksys::SystemTools::RemoveFile(argv[2]);
using PixelType = unsigned char;
using ImageType = itk::Image<PixelType, 3>;
itk::MetaImageIO::Pointer metaImageIO = itk::MetaImageIO::New();
using ReaderType = itk::ImageFileReader<ImageType>;
using WriterType = itk::ImageFileWriter<ImageType>;
auto reader = ReaderType::New();
reader->SetImageIO(metaImageIO);
reader->SetFileName(argv[1]);
reader->SetUseStreaming(true);
metaImageIO->SetUseStreamedReading(true);
ImageType::RegionType region;
ImageType::SizeType size;
ImageType::SizeType fullsize;
ImageType::IndexType index;
itk::SizeValueType numberOfPieces = 10;
// We decide how we want to read the image and we split accordingly
// The image is read slice by slice
reader->UpdateOutputInformation();
fullsize = reader->GetOutput()->GetLargestPossibleRegion().GetSize();
index.Fill(0);
size[0] = fullsize[0];
size[1] = fullsize[1];
size[2] = 0;
numberOfPieces = std::min(numberOfPieces, fullsize[2]);
unsigned int zsize = fullsize[2] / numberOfPieces;
// Setup the writer
auto writer = WriterType::New();
writer->SetFileName(argv[2]);
for (unsigned int i = 0; i < numberOfPieces; ++i)
{
std::cout << "Reading piece " << i + 1 << " of " << numberOfPieces << std::endl;
index[2] += size[2];
// At the end we need to adjust the size to make sure
// we are reading everything
if (i == numberOfPieces - 1)
{
size[2] = fullsize[2] - index[2];
}
else
{
size[2] = zsize;
}
region.SetIndex(index);
region.SetSize(size);
reader->GetOutput()->SetRequestedRegion(region);
std::cout << "Requested region = " << std::endl;
std::cout << region << std::endl;
try
{
reader->Update();
}
catch (const itk::ExceptionObject & ex)
{
std::cout << "ERROR : " << ex << std::endl;
return EXIT_FAILURE;
}
// Write the image
itk::ImageIORegion ioregion(3);
itk::ImageIORegion::IndexType index2;
index2.push_back(index[0]);
index2.push_back(index[1]);
index2.push_back(index[2]);
itk::ImageIORegion::SizeType size2;
size2.push_back(size[0]);
size2.push_back(size[1]);
size2.push_back(size[2]);
ioregion.SetIndex(index2);
ioregion.SetSize(size2);
writer->SetIORegion(ioregion);
writer->SetInput(reader->GetOutput());
try
{
writer->Update();
}
catch (const itk::ExceptionObject & err)
{
std::cerr << "ExceptionObject caught !" << std::endl;
std::cerr << err << std::endl;
return EXIT_FAILURE;
}
} // end for pieces
return EXIT_SUCCESS;
}
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