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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 <iostream>
#include "itkCastImageFilter.h"
#include "itkShrinkImageFilter.h"
#include "itkPipelineMonitorImageFilter.h"
#include "itkStreamingImageFilter.h"
#include "itkTestingMacros.h"
int
itkShrinkImageStreamingTest(int, char *[])
{
constexpr unsigned int numberOfStreamDivisions = 4;
// type alias to simplify the syntax
using ShortImage = itk::Image<short, 2>;
auto sourceImage = ShortImage::New();
using MonitorFilter = itk::PipelineMonitorImageFilter<ShortImage>;
// fill in an image
ShortImage::IndexType index = { { 100, 100 } };
ShortImage::SizeType size = { { 8, 12 } };
ShortImage::RegionType region{ index, size };
sourceImage->SetRegions(region);
sourceImage->Allocate();
itk::ImageRegionIterator<ShortImage> iterator(sourceImage, region);
short i = 0;
for (; !iterator.IsAtEnd(); ++iterator, ++i)
{
iterator.Set(i);
}
// use caster to copy source to intermediate image of only the
// requested region
itk::CastImageFilter<ShortImage, ShortImage>::Pointer caster;
caster = itk::CastImageFilter<ShortImage, ShortImage>::New();
caster->SetInput(sourceImage);
auto monitor1 = MonitorFilter::New();
monitor1->SetInput(caster->GetOutput());
// Create a filter, shrink by 2,3
itk::ShrinkImageFilter<ShortImage, ShortImage>::Pointer shrink;
shrink = itk::ShrinkImageFilter<ShortImage, ShortImage>::New();
shrink->SetInput(monitor1->GetOutput());
unsigned int factors[2] = { 2, 3 };
shrink->SetShrinkFactors(factors);
auto monitor2 = MonitorFilter::New();
monitor2->SetInput(shrink->GetOutput());
itk::StreamingImageFilter<ShortImage, ShortImage>::Pointer streamer;
streamer = itk::StreamingImageFilter<ShortImage, ShortImage>::New();
streamer->SetInput(monitor2->GetOutput());
streamer->SetNumberOfStreamDivisions(numberOfStreamDivisions);
streamer->Update();
// this verifies that the pipeline was executed as expected along
// with correct region propagation and output information
if (!monitor2->VerifyAllInputCanStream(numberOfStreamDivisions))
{
std::cout << "Filter failed to execute as expected!" << std::endl;
std::cout << monitor2;
return EXIT_FAILURE;
}
// Verify that only the data needed is requested;
for (const auto & j : monitor1->GetOutputRequestedRegions())
{
ITK_TEST_EXPECT_TRUE(j.GetSize(1) % factors[1] == 1);
}
return EXIT_SUCCESS;
}
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