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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 itkImageScanlineConstIterator_hxx
#define itkImageScanlineConstIterator_hxx
namespace itk
{
template <typename TImage>
void
ImageScanlineConstIterator<TImage>::NextLine()
{
// increment to the next scanline
// Get the index of the last pixel on the span (row)
IndexType ind = this->m_Image->ComputeIndex(static_cast<OffsetValueType>(m_SpanEndOffset - 1));
const IndexType & startIndex = this->m_Region.GetIndex();
const SizeType & size = this->m_Region.GetSize();
// Check to see if we are past the last pixel in the region
// Note that ++ind[0] moves to the next pixel along the row.
++ind[0];
bool done = (ind[0] == startIndex[0] + static_cast<IndexValueType>(size[0]));
for (unsigned int i = 1; done && i < ImageIteratorDimension; ++i)
{
done = (ind[i] == startIndex[i] + static_cast<IndexValueType>(size[i]) - 1);
}
// if the iterator is outside the region (but not past region begin) then
// we need to wrap around the region
unsigned int dim = 0;
if (!done)
{
while (((dim + 1) < ImageIteratorDimension) &&
(ind[dim] > startIndex[dim] + static_cast<IndexValueType>(size[dim]) - 1))
{
ind[dim] = startIndex[dim];
ind[++dim]++;
}
}
this->m_Offset = this->m_Image->ComputeOffset(ind);
m_SpanEndOffset = this->m_Offset + static_cast<OffsetValueType>(size[0]);
m_SpanBeginOffset = this->m_Offset;
}
} // end namespace itk
#endif
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