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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 "itkImage.h"
#include "itkVector.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionIteratorWithIndex.h"
#include <ctime>
int
itkIteratorTests(int, char *[])
{
std::cout << "Creating an image" << std::endl;
using ScalarImage = itk::Image<unsigned short, 3>;
auto o3 = ScalarImage::New();
double origin3D[3] = { 5, 2.1, 8.1 };
double spacing3D[3] = { 1.5, 2.1, 1 };
ScalarImage::SizeType imageSize3D = { { 200, 200, 200 } };
ScalarImage::SizeType bufferSize3D = { { 200, 200, 200 } };
ScalarImage::SizeType regionSize3D = { { 190, 190, 190 } };
ScalarImage::IndexType startIndex3D = { { 0, 0, 0 } };
ScalarImage::IndexType bufferStartIndex3D = { { 0, 0, 0 } };
ScalarImage::IndexType regionStartIndex3D = { { 5, 5, 5 } };
ScalarImage::RegionType region{ startIndex3D, imageSize3D };
o3->SetLargestPossibleRegion(region);
region.SetSize(bufferSize3D);
region.SetIndex(bufferStartIndex3D);
o3->SetBufferedRegion(region);
region.SetSize(regionSize3D);
region.SetIndex(regionStartIndex3D);
o3->SetRequestedRegion(region);
o3->SetOrigin(origin3D);
o3->SetSpacing(spacing3D);
o3->Allocate();
// extra variables
double elapsedTime;
clock_t start, end;
unsigned long num = 190 * 190 * 190;
unsigned long i;
bool passed = true;
// memset
start = clock();
unsigned short * ptr = o3->GetBufferPointer();
memset(ptr, 0, num * sizeof(unsigned short));
end = clock();
elapsedTime = (end - start) / static_cast<double>(CLOCKS_PER_SEC);
std::cout << "Raw pointer using memset" << std::endl;
std::cout << "\tTime = " << elapsedTime << std::endl;
std::cout << "\tPixels = " << num << std::endl;
// 1D array
start = clock();
ptr = o3->GetBufferPointer();
for (i = 0; i < num; ++i)
{
++ptr;
}
end = clock();
*ptr = 0;
elapsedTime = (end - start) / static_cast<double>(CLOCKS_PER_SEC);
std::cout << "Raw pointer as a 1D array" << std::endl;
std::cout << "\tTime = " << elapsedTime << std::endl;
std::cout << "\tPixels = " << i << std::endl;
if (i != num)
{
passed = false;
}
// 3 nested loops
unsigned long ii, jj, kk, len = 190;
start = clock();
i = 0;
ptr = o3->GetBufferPointer();
for (ii = 0; ii < len; ++ii)
for (jj = 0; jj < len; ++jj)
for (kk = 0; kk < len; ++kk)
{
*ptr = 5;
++ptr;
++i;
}
end = clock();
elapsedTime = (end - start) / static_cast<double>(CLOCKS_PER_SEC);
std::cout << "Raw pointer in 3 nested loops" << std::endl;
std::cout << "\tTime = " << elapsedTime << std::endl;
std::cout << "\tPixels = " << i << std::endl;
if (i != num)
{
passed = false;
}
// ImageRegionIterator
start = clock();
itk::ImageRegionIterator<ScalarImage> it(o3, region);
unsigned short scalar;
scalar = 5;
i = 0;
for (; !it.IsAtEnd(); ++it)
{
it.Set(scalar);
++i;
}
end = clock();
elapsedTime = (end - start) / static_cast<double>(CLOCKS_PER_SEC);
std::cout << "ImageRegionIterator" << std::endl;
std::cout << "\tTime = " << elapsedTime << std::endl;
std::cout << "\tPixels = " << i << std::endl;
if (i != num)
{
passed = false;
}
// ImageRegionIteratorWithIndex
start = clock();
itk::ImageRegionIteratorWithIndex<ScalarImage> it2(o3, region);
i = 0;
for (; !it2.IsAtEnd(); ++it2)
{
it2.Set(scalar);
++i;
}
end = clock();
elapsedTime = (end - start) / static_cast<double>(CLOCKS_PER_SEC);
std::cout << "ImageRegionIteratorWithIndex" << std::endl;
std::cout << "\tTime = " << elapsedTime << std::endl;
std::cout << "\tPixels = " << i << std::endl;
if (i != num)
{
passed = false;
}
if (passed)
{
std::cout << "Iterator tests passed" << std::endl;
return EXIT_SUCCESS;
}
else
{
std::cout << "Iterator tests failed" << std::endl;
return EXIT_FAILURE;
}
}
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