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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.
*
*=========================================================================*/
#ifndef itkVnlFFTCommon_h
#define itkVnlFFTCommon_h
#include "itkIntTypes.h"
#include "vnl/algo/vnl_fft_base.h"
namespace itk
{
/**
* \class VnlFFTCommon
* \brief Common routines related to Vnl's FFT implementation.
*
* \ingroup ITKFFT
*/
struct VnlFFTCommon
{
/** Vnl's FFT supports discrete Fourier transforms for images whose
sizes have a prime factorization consisting of 2's, 3's, and 5's. */
template <typename TSizeValue>
static bool
IsDimensionSizeLegal(TSizeValue n);
static constexpr SizeValueType GREATEST_PRIME_FACTOR = 5;
/** Convenience struct for computing the discrete Fourier
Transform. */
template <typename TImage>
struct VnlFFTTransform : public vnl_fft_base<TImage::ImageDimension, typename TImage::PixelType>
{
using Base = vnl_fft_base<TImage::ImageDimension, typename TImage::PixelType>;
//: constructor takes size of signal.
VnlFFTTransform(const typename TImage::SizeType & s);
};
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkVnlFFTCommon.hxx"
#endif
#endif // itkVnlFFTCommon_h
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