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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.
*
*=========================================================================*/
// First include the header file to be tested:
#include "itkImageBase.h"
#include "itkCovariantVector.h"
#include "itkImage.h"
#include "itkImageAdaptor.h"
#include "itkVector.h"
#include <gtest/gtest.h>
#include <type_traits> // For is_same.
namespace
{
template <typename TPixelType>
class DummyPixelAccessor
{
public:
using ExternalType = TPixelType;
using InternalType = TPixelType;
static void
Set(TPixelType & output, const TPixelType & input)
{
output = input;
}
static TPixelType
Get(const TPixelType & input)
{
return input;
}
};
template <typename T1, typename T2>
void
Expect_same_type_and_equal_value(T1 && value1, T2 && value2)
{
static_assert(std::is_same_v<T1, T2>, "Expect the same type!");
EXPECT_EQ(value1, value2);
}
template <typename TImage, typename TAccessor, typename TCoordRep>
void
Expect_TransformPhysicalPoint_member_functions_return_the_same_for_ImageAdapter_as_for_image(
const itk::ImageAdaptor<TImage, TAccessor> & imageAdaptor,
const TImage & image,
const itk::Point<TCoordRep, TImage::ImageDimension> & point)
{
Expect_same_type_and_equal_value(imageAdaptor.TransformPhysicalPointToIndex(point),
image.TransformPhysicalPointToIndex(point));
Expect_same_type_and_equal_value(imageAdaptor.template TransformPhysicalPointToContinuousIndex<float>(point),
image.template TransformPhysicalPointToContinuousIndex<float>(point));
Expect_same_type_and_equal_value(imageAdaptor.template TransformPhysicalPointToContinuousIndex<double>(point),
image.template TransformPhysicalPointToContinuousIndex<double>(point));
}
template <typename TImage, typename TAccessor, typename TIndexRep>
void
Expect_TransformContinuousIndexToPhysicalPoint_returns_the_same_for_ImageAdapter_as_for_image(
const itk::ImageAdaptor<TImage, TAccessor> & imageAdaptor,
const TImage & image,
const itk::ContinuousIndex<TIndexRep, TImage::ImageDimension> & continuousIndex)
{
Expect_same_type_and_equal_value(
imageAdaptor.template TransformContinuousIndexToPhysicalPoint<float>(continuousIndex),
image.template TransformContinuousIndexToPhysicalPoint<float>(continuousIndex));
Expect_same_type_and_equal_value(
imageAdaptor.template TransformContinuousIndexToPhysicalPoint<double>(continuousIndex),
image.template TransformContinuousIndexToPhysicalPoint<double>(continuousIndex));
}
template <typename TImage, typename TAccessor>
void
Expect_TransformIndexToPhysicalPoint_returns_the_same_for_ImageAdapter_as_for_image(
const itk::ImageAdaptor<TImage, TAccessor> & imageAdaptor,
const TImage & image,
const itk::Index<TImage::ImageDimension> & index)
{
Expect_same_type_and_equal_value(imageAdaptor.template TransformIndexToPhysicalPoint<float>(index),
image.template TransformIndexToPhysicalPoint<float>(index));
Expect_same_type_and_equal_value(imageAdaptor.template TransformIndexToPhysicalPoint<double>(index),
image.template TransformIndexToPhysicalPoint<double>(index));
}
template <typename TImage, typename TAccessor, typename TVector>
void
Expect_TransformLocalVectorToPhysicalVector_returns_the_same_for_ImageAdapter_as_for_image(
const itk::ImageAdaptor<TImage, TAccessor> & imageAdaptor,
const TImage & image,
const TVector & localVector)
{
Expect_same_type_and_equal_value(imageAdaptor.TransformLocalVectorToPhysicalVector(localVector),
image.TransformLocalVectorToPhysicalVector(localVector));
}
template <typename TImage>
void
Expect_Transform_member_functions_return_the_same_for_an_ImageAdapter_as_for_its_image(TImage & image)
{
const auto ImageDimension = TImage::ImageDimension;
using IndexType = itk::Index<ImageDimension>;
const auto imageAdaptor = itk::ImageAdaptor<TImage, DummyPixelAccessor<typename TImage::PixelType>>::New();
imageAdaptor->SetImage(&image);
for (const auto & point :
{ itk::Point<double, ImageDimension>(), itk::MakeFilled<itk::Point<double, ImageDimension>>(1.0) })
{
Expect_TransformPhysicalPoint_member_functions_return_the_same_for_ImageAdapter_as_for_image(
*imageAdaptor, image, point);
}
for (const auto & continuousIndex : { itk::ContinuousIndex<double, ImageDimension>(),
itk::ContinuousIndex<double, ImageDimension>(IndexType::Filled(1)) })
{
Expect_TransformContinuousIndexToPhysicalPoint_returns_the_same_for_ImageAdapter_as_for_image(
*imageAdaptor, image, continuousIndex);
}
for (const auto & index : { IndexType(), IndexType::Filled(1) })
{
Expect_TransformIndexToPhysicalPoint_returns_the_same_for_ImageAdapter_as_for_image(*imageAdaptor, image, index);
}
for (const auto & fixedArray :
{ itk::FixedArray<float, ImageDimension>(), itk::FixedArray<float, ImageDimension>::Filled(1.0f) })
{
Expect_TransformLocalVectorToPhysicalVector_returns_the_same_for_ImageAdapter_as_for_image(
*imageAdaptor, image, fixedArray);
}
for (const auto & fixedArray :
{ itk::FixedArray<double, ImageDimension>(), itk::FixedArray<double, ImageDimension>::Filled(1.0) })
{
Expect_TransformLocalVectorToPhysicalVector_returns_the_same_for_ImageAdapter_as_for_image(
*imageAdaptor, image, fixedArray);
}
Expect_TransformLocalVectorToPhysicalVector_returns_the_same_for_ImageAdapter_as_for_image(
*imageAdaptor, image, itk::Vector<double, ImageDimension>());
Expect_TransformLocalVectorToPhysicalVector_returns_the_same_for_ImageAdapter_as_for_image(
*imageAdaptor, image, itk::CovariantVector<double, ImageDimension>());
}
} // end namespace
// Tests that any single parameter Transform member function of ImageAdapter return the same as the corresponding
// function call on its image.
TEST(ImageAdapter, TransformMemberFunctionsReturnSameAsForImage)
{
// Test both 2D and 3D, for different pixel types, origins and spacings:
const auto image2D = itk::Image<double>::New();
image2D->SetSpacing(itk::MakeVector(2.0, 3.0));
image2D->SetOrigin(itk::MakePoint(-1.0, 1.0));
Expect_Transform_member_functions_return_the_same_for_an_ImageAdapter_as_for_its_image(*image2D);
const auto image3D = itk::Image<unsigned char, 3>::New();
Expect_Transform_member_functions_return_the_same_for_an_ImageAdapter_as_for_its_image(*image3D);
}
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