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/*
* Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 otbImageRegionTileMapSplitter_hxx
#define otbImageRegionTileMapSplitter_hxx
#include "otbImageRegionTileMapSplitter.h"
#include "otbMath.h"
#include "otbMacro.h"
namespace otb
{
/**
*
*/
template <unsigned int VImageDimension>
unsigned int ImageRegionTileMapSplitter<VImageDimension>::GetNumberOfSplits(const RegionType& region, unsigned int requestedNumber)
{
const SizeType& regionSize = region.GetSize();
const IndexType& regionIndex = region.GetIndex();
// requested number of splits per dimension
unsigned int numPieces = 1;
// determine the actual number of pieces that will be generated
for (unsigned int j = VImageDimension; j > 0; --j)
{
// otbMsgDevMacro(<< "*** Dimension: " << j-1);
unsigned long int remainingToDo = static_cast<unsigned long int>(std::ceil(static_cast<double>(requestedNumber) / numPieces));
unsigned int maxPieces = (regionIndex[j - 1] + regionSize[j - 1] - 1) / m_AlignStep - regionIndex[j - 1] / m_AlignStep + 1;
unsigned int stepPerPiece = 1;
if (remainingToDo < maxPieces)
{
stepPerPiece = static_cast<unsigned int>(std::floor(static_cast<double>(maxPieces) / remainingToDo));
if ((remainingToDo - 1) * (stepPerPiece + 1) < maxPieces)
{
stepPerPiece += 1;
}
}
unsigned int maxPieceUsed = static_cast<unsigned int>(std::ceil(static_cast<double>(maxPieces) / stepPerPiece));
m_SplitsPerDimension[j - 1] = maxPieceUsed;
// otbMsgDevMacro("*** maxPieces stepPerPiece maxPieceUsed " << maxPieces
// << " " << stepPerPiece << " " << maxPieceUsed);
numPieces *= maxPieceUsed;
}
// otbMsgDevMacro("*** numPieces " << numPieces);
return numPieces;
}
/**
*
*/
template <unsigned int VImageDimension>
itk::ImageRegion<VImageDimension> ImageRegionTileMapSplitter<VImageDimension>::GetSplit(unsigned int i, unsigned int numberOfPieces, const RegionType& region)
{
RegionType splitRegion;
IndexType splitIndex, regionIndex;
SizeType splitSize, regionSize;
// Initialize the splitRegion to the requested region
splitRegion = region;
splitIndex = splitRegion.GetIndex();
splitSize = splitRegion.GetSize();
regionSize = region.GetSize();
regionIndex = region.GetIndex();
unsigned int numPieces = GetNumberOfSplits(region, numberOfPieces);
if (i > numPieces)
{
itkDebugMacro(" Cannot Split");
return splitRegion;
}
unsigned int stackSize = 1;
for (unsigned int j = 0; j < VImageDimension; ++j)
{
unsigned int slicePos = (i % (stackSize * m_SplitsPerDimension[j])) / stackSize;
stackSize *= m_SplitsPerDimension[j];
unsigned int generalSplitSize =
static_cast<unsigned int>(std::ceil(static_cast<double>(regionSize[j]) / (m_SplitsPerDimension[j] * m_AlignStep))) * m_AlignStep;
if (slicePos == 0)
{
splitIndex[j] = regionIndex[j];
}
else
{
splitIndex[j] = (regionIndex[j] / generalSplitSize + slicePos) * generalSplitSize;
}
if (slicePos == 0)
{
splitSize[j] = generalSplitSize - (regionIndex[j] % generalSplitSize);
}
else if (slicePos == m_SplitsPerDimension[j] - 1)
{
splitSize[j] = regionSize[j] - (generalSplitSize - (regionIndex[j] % generalSplitSize)) - (m_SplitsPerDimension[j] - 2) * generalSplitSize;
}
else
{
splitSize[j] = generalSplitSize;
}
}
// set the split region ivars
splitRegion.SetIndex(splitIndex);
splitRegion.SetSize(splitSize);
return splitRegion;
}
/**
*
*/
template <unsigned int VImageDimension>
void ImageRegionTileMapSplitter<VImageDimension>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
Superclass::PrintSelf(os, indent);
}
} // end namespace itk
#endif
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