/*=========================================================================
 *
 *  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_hxx
#define itkVnlFFTCommon_hxx


namespace itk
{

template <typename TSizeValue>
bool
VnlFFTCommon::IsDimensionSizeLegal(TSizeValue n)
{
  int ifac = 2;

  for (int l = 1; l <= 3; ++l)
  {
    for (; n % ifac == 0;)
    {
      n /= ifac;
    }
    ifac += l;
  }
  return n == 1; // return false if decomposition failed
}

template <typename TImage>
VnlFFTCommon::VnlFFTTransform<TImage>::VnlFFTTransform(const typename TImage::SizeType & s)
{
  for (unsigned int i = 0; i < TImage::ImageDimension; ++i)
  {
    Base::factors_[TImage::ImageDimension - i - 1].resize(s[i]);
  }
}

} // end namespace itk

#endif // itkVnlFFTCommon_hxx
