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