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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 "itkImageNeighborhoodOffsets.h"
#include "itkOffset.h"
#include "itkSize.h"
#include <array>
#include <vector>
#include <gtest/gtest.h>
namespace
{
// Empty shape, just for test purposes. Compatible with the template argument
// of GenerateImageNeighborhoodOffsets<ImageNeighborhoodShape>(shape).
template <unsigned int VImageDimension>
class EmptyImageNeighborhoodShape
{
public:
static constexpr unsigned int ImageDimension = VImageDimension;
// Returns the number of offsets needed to represent this shape.
constexpr size_t
GetNumberOfOffsets() const noexcept
{
return 0;
}
// Fills the specified buffer with the offsets for this shape.
void
FillOffsets(itk::Offset<ImageDimension> *) const noexcept
{
// The shape is empty, so just do nothing!
}
};
} // namespace
TEST(ImageNeighborhoodOffsets, GenerateImageNeighborhoodOffsetsReturnsEmptyVectorForEmptyShape)
{
constexpr unsigned int ImageDimension = 2;
const EmptyImageNeighborhoodShape<ImageDimension> shape = {};
const std::vector<itk::Offset<>> offsets = itk::GenerateImageNeighborhoodOffsets(shape);
EXPECT_EQ(offsets, std::vector<itk::Offset<>>());
}
TEST(ImageNeighborhoodOffsets, GenerateRectangularImageNeighborhoodOffsetsReturnsOneOffsetForDefaultRadius)
{
const itk::Size<> radius = { {} };
const std::vector<itk::Offset<>> offsets = itk::GenerateRectangularImageNeighborhoodOffsets(radius);
EXPECT_EQ(offsets, std::vector<itk::Offset<>>(1));
}
TEST(ImageNeighborhoodOffsets, GenerateRectangularImageNeighborhoodOffsetsForSmallestHorizontalNeigborhood)
{
const itk::Size<> radius = { { 1, 0 } };
const std::vector<itk::Offset<>> offsets = itk::GenerateRectangularImageNeighborhoodOffsets(radius);
EXPECT_EQ(offsets, (std::vector<itk::Offset<>>{ { { -1, 0 } }, { { 0, 0 } }, { { 1, 0 } } }));
}
TEST(ImageNeighborhoodOffsets, GenerateRectangularImageNeighborhoodOffsetsForSmallestVerticalNeigborhood)
{
const itk::Size<> radius = { { 0, 1 } };
const std::vector<itk::Offset<>> offsets = itk::GenerateRectangularImageNeighborhoodOffsets(radius);
EXPECT_EQ(offsets, (std::vector<itk::Offset<>>{ { { 0, -1 } }, { { 0, 0 } }, { { 0, 1 } } }));
}
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