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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 "itkFloatingPointExceptions.h"
#include "itkTimeProbe.h"
#include "itkImageAlgorithm.h"
template <typename TImage>
static void
AverageTestCopy(typename TImage::SizeType & size)
{
std::cout << "--- For image size: " << size << " ---" << std::endl;
using PixelType = typename TImage::PixelType;
using ImageType = TImage;
typename ImageType::RegionType region;
typename ImageType::IndexType index;
index.Fill(0);
region.SetSize(size);
region.SetIndex(index);
auto inImage = ImageType::New();
inImage->SetRegions(region);
inImage->Allocate();
inImage->FillBuffer(12);
auto outImage = ImageType::New();
outImage->SetRegions(region);
outImage->Allocate();
outImage->FillBuffer(12);
itk::TimeProbe t;
using ImageIterator = itk::ImageRegionIterator<ImageType>;
for (unsigned int i = 0; i < 10; ++i)
{
t.Start();
ImageIterator outIt(outImage, region);
ImageIterator sourceIt(inImage, region);
// walk the output region, and sample the source image
while (!outIt.IsAtEnd())
{
// copy the input pixel to the output
outIt.Set(sourceIt.Get());
++outIt;
++sourceIt;
}
t.Stop();
}
std::cout << "\tIterator Copy Average Time: " << t.GetMean() << t.GetUnit() << std::endl;
itk::TimeProbe t2;
for (unsigned int i = 0; i < 10; ++i)
{
t2.Start();
memcpy(inImage->GetBufferPointer(), outImage->GetBufferPointer(), region.GetNumberOfPixels() * sizeof(PixelType));
t2.Stop();
}
std::cout << "\tmemcpy Copy Average Time: " << t2.GetMean() << t2.GetUnit() << std::endl;
itk::TimeProbe t3;
for (unsigned int i = 0; i < 10; ++i)
{
t3.Start();
itk::ImageAlgorithm::Copy(inImage.GetPointer(), outImage.GetPointer(), region, region);
t3.Stop();
}
std::cout << "\tImageCopy Average Time: " << t3.GetMean() << t3.GetUnit() << std::endl;
const double referenceTime = t.GetMean();
const double memCopyTime = t2.GetMean();
const double imageCopyTime = t3.GetMean();
if (itk::FloatingPointExceptions::HasFloatingPointExceptionsSupport())
{
itk::FloatingPointExceptions::Disable();
}
std::cout << "== SUMMARY SPEEDUP RESULTS == " << std::endl;
std::cout << "memcpy is " << referenceTime / memCopyTime << " times faster" << std::endl;
std::cout << "ImageCopy is " << referenceTime / imageCopyTime << " times faster" << std::endl;
if (itk::FloatingPointExceptions::HasFloatingPointExceptionsSupport())
{
itk::FloatingPointExceptions::Enable();
}
}
int
itkImageAlgorithmCopyTest(int, char *[])
{
using ImageType3D = itk::Image<char, 3>;
ImageType3D::SizeType size3d;
size3d.Fill(16);
AverageTestCopy<ImageType3D>(size3d);
size3d.Fill(32);
AverageTestCopy<ImageType3D>(size3d);
size3d.Fill(64);
AverageTestCopy<ImageType3D>(size3d);
size3d.Fill(128);
AverageTestCopy<ImageType3D>(size3d);
using ImageType2D = itk::Image<char, 2>;
ImageType2D::SizeType size2d;
size2d.Fill(16);
AverageTestCopy<ImageType2D>(size2d);
size2d.Fill(32);
AverageTestCopy<ImageType2D>(size2d);
size2d.Fill(64);
AverageTestCopy<ImageType2D>(size2d);
return EXIT_SUCCESS;
}
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