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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageIterator.txx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#ifndef vtkImageIterator_txx
#define vtkImageIterator_txx
#include "vtkImageData.h"
#include "vtkImageIterator.h"
//----------------------------------------------------------------------------
template <class DType>
vtkImageIterator<DType>::vtkImageIterator()
{
this->Pointer = nullptr;
this->EndPointer = nullptr;
this->SpanEndPointer = nullptr;
this->SliceEndPointer = nullptr;
}
//----------------------------------------------------------------------------
template <class DType>
void vtkImageIterator<DType>::Initialize(vtkImageData* id, int* ext)
{
this->Pointer = static_cast<DType*>(id->GetScalarPointerForExtent(ext));
id->GetIncrements(this->Increments[0], this->Increments[1], this->Increments[2]);
id->GetContinuousIncrements(ext, this->ContinuousIncrements[0], this->ContinuousIncrements[1],
this->ContinuousIncrements[2]);
this->EndPointer =
static_cast<DType*>(id->GetScalarPointer(ext[1], ext[3], ext[5])) + this->Increments[0];
// if the extent is empty then the end pointer should equal the beg pointer
if (ext[1] < ext[0] || ext[3] < ext[2] || ext[5] < ext[4])
{
this->EndPointer = this->Pointer;
}
this->SpanEndPointer = this->Pointer + this->Increments[0] * (ext[1] - ext[0] + 1);
this->SliceEndPointer = this->Pointer + this->Increments[1] * (ext[3] - ext[2] + 1);
}
//----------------------------------------------------------------------------
template <class DType>
vtkImageIterator<DType>::vtkImageIterator(vtkImageData* id, int* ext)
{
this->Initialize(id, ext);
}
//----------------------------------------------------------------------------
template <class DType>
void vtkImageIterator<DType>::NextSpan()
{
this->Pointer += this->Increments[1];
this->SpanEndPointer += this->Increments[1];
if (this->Pointer >= this->SliceEndPointer)
{
this->Pointer += this->ContinuousIncrements[2];
this->SpanEndPointer += this->ContinuousIncrements[2];
this->SliceEndPointer += this->Increments[2];
}
}
#endif
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