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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 "itkVector.h"
#include <gtest/gtest.h>
#include <type_traits> // For is_same.
namespace
{
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>
void
Expect_by_default_Transform_result_equals_default_constructed_value(const typename TImage::SizeType & imageSize)
{
const auto ImageDimension = TImage::ImageDimension;
const auto image = TImage::New();
image->SetRegions(imageSize);
image->Allocate();
using ImageBaseType = itk::ImageBase<ImageDimension>;
using IndexType = typename ImageBaseType::IndexType;
using PointType = itk::Point<double, ImageDimension>;
using ContinuousIndexType = itk::ContinuousIndex<double, ImageDimension>;
using FloatArrayType = itk::FixedArray<float, ImageDimension>;
using DoubleArrayType = itk::FixedArray<double, ImageDimension>;
using VectorType = itk::Vector<double, ImageDimension>;
using CovariantVectorType = itk::CovariantVector<double, ImageDimension>;
const ImageBaseType & imageBase = *image;
Expect_same_type_and_equal_value(imageBase.TransformPhysicalPointToIndex(PointType()), IndexType());
// For the three member functions TransformPhysicalPointToContinuousIndex,
// TransformContinuousIndexToPhysicalPoint, and TransformIndexToPhysicalPoint,
// the first template argument of the return type is expected to
// correspond with the first template argument of the member function.
Expect_same_type_and_equal_value(imageBase.template TransformPhysicalPointToContinuousIndex<float>(PointType()),
itk::ContinuousIndex<float, ImageDimension>());
Expect_same_type_and_equal_value(imageBase.template TransformPhysicalPointToContinuousIndex<double>(PointType()),
itk::ContinuousIndex<double, ImageDimension>());
Expect_same_type_and_equal_value(
imageBase.template TransformContinuousIndexToPhysicalPoint<float>(ContinuousIndexType()),
itk::Point<float, ImageDimension>());
Expect_same_type_and_equal_value(
imageBase.template TransformContinuousIndexToPhysicalPoint<double>(ContinuousIndexType()),
itk::Point<double, ImageDimension>());
Expect_same_type_and_equal_value(imageBase.template TransformIndexToPhysicalPoint<float>(IndexType()),
itk::Point<float, ImageDimension>());
Expect_same_type_and_equal_value(imageBase.template TransformIndexToPhysicalPoint<double>(IndexType()),
itk::Point<double, ImageDimension>());
// The two member functions TransformLocalVectorToPhysicalVector and
// TransformPhysicalVectorToLocalVector are expected to return an
// array or vector of the same type as their first function argument.
Expect_same_type_and_equal_value(imageBase.TransformLocalVectorToPhysicalVector(FloatArrayType()), FloatArrayType());
Expect_same_type_and_equal_value(imageBase.TransformLocalVectorToPhysicalVector(DoubleArrayType()),
DoubleArrayType());
Expect_same_type_and_equal_value(imageBase.TransformLocalVectorToPhysicalVector(VectorType()), VectorType());
Expect_same_type_and_equal_value(imageBase.TransformLocalVectorToPhysicalVector(CovariantVectorType()),
CovariantVectorType());
Expect_same_type_and_equal_value(imageBase.TransformPhysicalVectorToLocalVector(FloatArrayType()), FloatArrayType());
Expect_same_type_and_equal_value(imageBase.TransformPhysicalVectorToLocalVector(DoubleArrayType()),
DoubleArrayType());
Expect_same_type_and_equal_value(imageBase.TransformPhysicalVectorToLocalVector(VectorType()), VectorType());
Expect_same_type_and_equal_value(imageBase.TransformPhysicalVectorToLocalVector(CovariantVectorType()),
CovariantVectorType());
}
template <unsigned int VImageDimension>
void
Check_New_ImageBase()
{
const auto imageBase = itk::ImageBase<VImageDimension>::New();
ASSERT_NE(imageBase, nullptr);
for (const auto spacingValue : imageBase->GetSpacing())
{
EXPECT_FLOAT_EQ(spacingValue, 1.0);
}
for (const auto originValue : imageBase->GetOrigin())
{
EXPECT_FLOAT_EQ(originValue, 0.0);
}
EXPECT_TRUE(imageBase->GetDirection().GetVnlMatrix().is_identity());
EXPECT_TRUE(imageBase->GetInverseDirection().GetVnlMatrix().is_identity());
}
template <unsigned int VImageDimension>
void
CheckInvalidSpacingExceptions()
{
using SpacingType = typename itk::ImageBase<VImageDimension>::SpacingType;
using DirectionType = typename itk::ImageBase<VImageDimension>::DirectionType;
const auto imageBase = itk::ImageBase<VImageDimension>::New();
// Test exceptions
const SpacingType initialSpacing = imageBase->GetSpacing();
const auto negativeSpacing = itk::MakeFilled<SpacingType>(-1.0);
const SpacingType zeroSpacing{};
#if !defined(ITK_LEGACY_REMOVE)
// Only a warning is displayed
imageBase->SetSpacing(negativeSpacing);
EXPECT_EQ(imageBase->GetSpacing(), negativeSpacing);
// Set the spacing value back to its default value
imageBase->SetSpacing(initialSpacing);
#else
EXPECT_THROW(imageBase->SetSpacing(negativeSpacing), itk::ExceptionObject);
EXPECT_EQ(imageBase->GetSpacing(), initialSpacing);
#endif
EXPECT_THROW(imageBase->SetSpacing(zeroSpacing), itk::ExceptionObject);
EXPECT_EQ(imageBase->GetSpacing(), initialSpacing);
const DirectionType initialDirection = imageBase->GetDirection();
const DirectionType zeroDirection{};
EXPECT_THROW(imageBase->SetDirection(zeroDirection), itk::ExceptionObject);
// The direction should be kept unmodified after the attempt
EXPECT_EQ(imageBase->GetDirection(), initialDirection);
}
} // end namespace
// Tests that "by default" (when the image has a default origin and a default
// direction matrix, and the function argument is just default-constructed), the
// return value of a single-parameter Transform member function is equal to a
// default-constructed value. This is tested for all six single-parameter
// Transform member functions of ImageBase.
TEST(ImageBase, ByDefaultTransformResultEqualsDefaultConstructedValue)
{
// Test both 2D and 3D, for different pixel types and sizes:
Expect_by_default_Transform_result_equals_default_constructed_value<itk::Image<double>>({ { 2, 2 } });
Expect_by_default_Transform_result_equals_default_constructed_value<itk::Image<unsigned char, 3>>({ { 2, 3, 4 } });
}
TEST(ImageBase, New)
{
Check_New_ImageBase<2>();
Check_New_ImageBase<3>();
}
TEST(ImageBase, InvalidSpacingExceptions)
{
CheckInvalidSpacingExceptions<2>();
CheckInvalidSpacingExceptions<3>();
}
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