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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 otbImageRegionSquareTileSplitter_hxx
#define otbImageRegionSquareTileSplitter_hxx
#include "otbImageRegionSquareTileSplitter.h"
#include "otbMath.h"
#include "otbMacro.h"
namespace otb
{
template <unsigned int VImageDimension>
unsigned int ImageRegionSquareTileSplitter<VImageDimension>::GetNumberOfSplits(const RegionType& region, unsigned int requestedNumber)
{
unsigned int theoricalNbPixelPerTile = region.GetNumberOfPixels() / requestedNumber;
unsigned int theoricalTileDimension = static_cast<unsigned int>(std::sqrt(static_cast<double>(theoricalNbPixelPerTile)));
// Take the next multiple of m_TileSizeAlignment (eventually generate more splits than requested)
m_TileDimension = (theoricalTileDimension + m_TileSizeAlignment - 1) / m_TileSizeAlignment * m_TileSizeAlignment;
// Minimal tile size is m_TileSizeAlignment * m_TileSizeAlignment
if (m_TileDimension < m_TileSizeAlignment)
{
otbMsgDevMacro(<< "Warning: clamping tile size to " << m_TileSizeAlignment << " * " << m_TileSizeAlignment);
m_TileDimension = m_TileSizeAlignment;
}
unsigned int numPieces = 1;
const SizeType& regionSize = region.GetSize();
for (unsigned int j = 0; j < VImageDimension; ++j)
{
m_SplitsPerDimension[j] = (regionSize[j] + m_TileDimension - 1) / m_TileDimension;
numPieces *= m_SplitsPerDimension[j];
}
otbMsgDevMacro(<< "Tile dimension : " << m_TileDimension)
otbMsgDevMacro(<< "Number of splits per dimension : " << m_SplitsPerDimension[0] << " " << m_SplitsPerDimension[1])
return numPieces;
}
template <unsigned int VImageDimension>
itk::ImageRegion<VImageDimension> ImageRegionSquareTileSplitter<VImageDimension>::GetSplit(unsigned int i, unsigned int itkNotUsed(numberOfPieces),
const RegionType& region)
{
RegionType splitRegion;
IndexType splitIndex;
// Compute the actual number of splits
unsigned int numPieces = 1;
for (unsigned int j = 0; j < VImageDimension; ++j)
{
numPieces *= m_SplitsPerDimension[j];
}
// Sanity check
if (i >= numPieces)
{
itkExceptionMacro("Asked for split number " << i << " but region contains only " << numPieces << " splits");
}
// Compute the split index in the streaming grid
unsigned int remaining = i;
for (unsigned int j = VImageDimension - 1; j > 0; --j)
{
splitIndex[j] = remaining / m_SplitsPerDimension[VImageDimension - 1 - j];
remaining = remaining % m_SplitsPerDimension[VImageDimension - 1 - j];
}
splitIndex[0] = remaining;
// Transform the split index to the actual coordinates
for (unsigned int j = 0; j < VImageDimension; ++j)
{
splitRegion.SetIndex(j, region.GetIndex(j) + m_TileDimension * splitIndex[j]);
splitRegion.SetSize(j, m_TileDimension);
}
// Handle the borders
splitRegion.Crop(region);
return splitRegion;
}
/**
*
*/
template <unsigned int VImageDimension>
void ImageRegionSquareTileSplitter<VImageDimension>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "SplitsPerDimension : " << m_SplitsPerDimension << std::endl;
os << indent << "TileDimension : " << m_TileDimension << std::endl;
os << indent << "TileSizeAlignment : " << m_TileSizeAlignment << std::endl;
}
} // end namespace itk
#endif
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