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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 itkImageRandomNonRepeatingConstIteratorWithIndex_hxx
#define itkImageRandomNonRepeatingConstIteratorWithIndex_hxx
namespace itk
{
template <typename TImage>
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>::ImageRandomNonRepeatingConstIteratorWithIndex(
const ImageType * ptr,
const RegionType & region)
: ImageConstIteratorWithIndex<TImage>(ptr, region)
{
m_NumberOfPixelsInRegion = region.GetNumberOfPixels();
m_NumberOfSamplesRequested = 0L;
m_NumberOfSamplesDone = 0L;
m_Permutation = new RandomPermutation(m_NumberOfPixelsInRegion);
}
template <typename TImage>
ImageRandomNonRepeatingConstIteratorWithIndex<TImage> &
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>::operator=(const Self & it)
{
if (this != &it)
{
this->ImageConstIteratorWithIndex<TImage>::operator=(it);
if (m_Permutation)
{
*m_Permutation = *(it.m_Permutation);
}
else
{
m_NumberOfPixelsInRegion = it.GetRegion().GetNumberOfPixels();
m_NumberOfSamplesRequested = 0L;
m_NumberOfSamplesDone = 0L;
m_Permutation = new RandomPermutation(m_NumberOfPixelsInRegion);
}
}
return *this;
}
template <typename TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>::ReinitializeSeed()
{
this->m_Permutation->ReinitializeSeed();
this->m_Permutation->Shuffle();
}
template <typename TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>::ReinitializeSeed(int seed)
{
this->m_Permutation->ReinitializeSeed(seed);
this->m_Permutation->Shuffle();
}
template <typename TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>::SetPriorityImage(const PriorityImageType * priorityImage)
{
// should probably do error checking to be sure that the priority
// image is the right size
using PositionValueType = SizeValueType;
for (PositionValueType pixel = 0; pixel < m_NumberOfPixelsInRegion; ++pixel)
{
PositionValueType position = pixel;
IndexType positionIndex;
for (unsigned int dim = 0; dim < TImage::ImageDimension; ++dim)
{
const SizeValueType sizeInThisDimension = this->m_Region.GetSize()[dim];
const PositionValueType residual = position % sizeInThisDimension;
positionIndex[dim] = residual + this->m_BeginIndex[dim];
position -= residual;
position /= sizeInThisDimension;
}
this->m_Permutation->SetPriority(pixel, priorityImage->GetPixel(positionIndex));
}
this->m_Permutation->Shuffle();
}
template <typename TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>::UpdatePosition()
{
using PositionValueType = IndexValueType;
PositionValueType position = (*(this->m_Permutation))[m_NumberOfSamplesDone % m_NumberOfSamplesRequested];
for (unsigned int dim = 0; dim < TImage::ImageDimension; ++dim)
{
const SizeValueType sizeInThisDimension = this->m_Region.GetSize()[dim];
const PositionValueType residual = position % sizeInThisDimension;
this->m_PositionIndex[dim] = residual + this->m_BeginIndex[dim];
position -= residual;
position /= sizeInThisDimension;
}
this->m_Position = this->m_Image->GetBufferPointer() + this->m_Image->ComputeOffset(this->m_PositionIndex);
}
} // end namespace itk
#endif
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