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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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
*
* http://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.
*
*=========================================================================*/
/**
* This file contains classes that can be used to drive an image-to-image
* type filter in or out of an itk pipeline for testing purposes.
*/
#ifndef __itkNullImageToImageFilterDriver_hxx
#define __itkNullImageToImageFilterDriver_hxx
#include "itkPixelTraits.h"
#include "itkImage.h"
#include "itkImageToImageFilter.h"
#include "itkIndex.h"
#include <iostream>
extern "C" {
#include <ctime>
}
namespace itk {
/**
* \class NullImageToImageFilterDriver
* \brief Drives an image-to-image type itk process object with null inputs and
* null outputs.
*
* Provides a non-pipeline framework for testing image-to-image
* filters. Allocates an input image and sets up an output image, then calls
* Update on the filter. Times the execution of the filter.
*/
template <typename TInputImage, typename TOutputImage>
class NullImageToImageFilterDriver
{
public:
NullImageToImageFilterDriver():
m_Filter( ITK_NULLPTR )
{};
typedef typename TInputImage::SizeType ImageSizeType;
typedef typename TInputImage::PixelType InputPixelType;
enum {InputPixelDimension=PixelTraits<InputPixelType>::Dimension};
/**
* Set the image-to-image filter to drive.
*/
void SetFilter(ImageToImageFilter<TInputImage, TOutputImage> * filter)
{ m_Filter = filter; }
/**
* Set the size of the input and output image.
*/
void SetImageSize(const ImageSizeType size)
{ m_ImageSize = size; }
/**
* Drive the filter without using the itk pipeline.
*/
void Execute();
protected:
struct DispatchBase {};
template<unsigned int VDimension>
struct Dispatch : public DispatchBase {};
void InitializePixel(InputPixelType &pixel);
void InitializePixel(const DispatchBase&, InputPixelType &pixel);
void InitializePixel(const Dispatch<1>&, InputPixelType &pixel);
private:
ImageToImageFilter<TInputImage, TOutputImage> *m_Filter;
ImageSizeType m_ImageSize;
};
template <typename TInputImage, typename TOutputImage>
void
NullImageToImageFilterDriver<TInputImage, TOutputImage>
::InitializePixel(InputPixelType &pixel)
{
this->InitializePixel(Dispatch<InputPixelDimension>(), pixel);
}
template <typename TInputImage, typename TOutputImage>
void
NullImageToImageFilterDriver<TInputImage, TOutputImage>
::InitializePixel(const DispatchBase &, InputPixelType &pixel)
{
for (unsigned int i=0; i < InputPixelDimension; ++i)
{
pixel[i] = NumericTraits<typename PixelTraits<InputPixelType>::ValueType>::Zero;
}
}
template <typename TInputImage, typename TOutputImage>
void
NullImageToImageFilterDriver<TInputImage, TOutputImage>
::InitializePixel(const Dispatch<1> &, InputPixelType &pixel)
{
pixel = NumericTraits<InputPixelType>::Zero;
}
/**
* Drive the filter without using the itk pipeline
*/
template <typename TInputImage, typename TOutputImage>
void
NullImageToImageFilterDriver<TInputImage, TOutputImage>
::Execute()
{
enum { ImageDimension = TInputImage::ImageDimension };
// Set up input images
typename TInputImage::Pointer ip = TInputImage::New();
typename TOutputImage::IndexType index;
typename TOutputImage::RegionType region;
for (unsigned int i = 0; i < ImageDimension; ++i) index[i] = 0;
region.SetSize( m_ImageSize );
region.SetIndex( index);
// Allocate the input
ip->SetLargestPossibleRegion( region );
ip->SetBufferedRegion(region);
ip->SetRequestedRegion(region);
ip->Allocate();
// Construct a pixel to fill the image
InputPixelType pixel;
this->InitializePixel(pixel);
ip->FillBuffer(pixel);
// Setup the filter
m_Filter->SetInput(ip);
// print out the ouput object so we can see it modified times and regions
// std::cout << "Output object before filter execution" << std::endl
// << m_Filter->GetOutput() << std::endl;
typedef ImageToImageFilter<TInputImage, TOutputImage> ImageFilterType;
typename ImageFilterType::Pointer sourceBefore =
dynamic_cast< ImageFilterType * >( m_Filter->GetOutput()->GetSource().GetPointer() );
// Execute the filter
clock_t start = ::clock();
m_Filter->UpdateLargestPossibleRegion();
clock_t stop = ::clock();
// print out the ouput object so we can see it modified times and regions
std::cout << "Output object after filter execution" << std::endl
<< m_Filter->GetOutput() << std::endl;
typename ImageFilterType::Pointer sourceAfter =
dynamic_cast< ImageFilterType * >( m_Filter->GetOutput()->GetSource().GetPointer() );
std::cout << sourceBefore.GetPointer() << ", " << sourceAfter.GetPointer() << std::endl;
if (sourceBefore.GetPointer() != sourceAfter.GetPointer())
{
std::cout << std::endl << "Pipeline corrupt, filter output source different after execution." << std::endl;
}
else
{
std::cout << std::endl << "Pipeline intact" << std::endl;
}
std::cout << "Execution time was approximately " << (stop - start)
<< " clock cycles." << std::endl;
}
} // end namespace itk
#endif
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