1 /*=========================================================================
2
3 Program: Visualization Toolkit
4 Module: vtkImageIterator.txx
5
6 Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
7 All rights reserved.
8 See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
9
10 This software is distributed WITHOUT ANY WARRANTY; without even
11 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
12 PURPOSE. See the above copyright notice for more information.
13
14 =========================================================================*/
15 // Include blockers needed since vtkImageIterator.h includes this file
16 // when VTK_NO_EXPLICIT_TEMPLATE_INSTANTIATION is defined.
17
18 #ifndef vtkImageIterator_txx
19 #define vtkImageIterator_txx
20
21 #include "vtkImageIterator.h"
22 #include "vtkImageData.h"
23
24 //----------------------------------------------------------------------------
25 template <class DType>
vtkImageIterator()26 vtkImageIterator<DType>::vtkImageIterator()
27 {
28 this->Pointer = 0;
29 this->EndPointer = 0;
30 this->SpanEndPointer = 0;
31 this->SliceEndPointer = 0;
32 }
33
34 //----------------------------------------------------------------------------
35 template <class DType>
Initialize(vtkImageData * id,int * ext)36 void vtkImageIterator<DType>::Initialize(vtkImageData *id, int *ext)
37 {
38 this->Pointer = static_cast<DType *>(id->GetScalarPointerForExtent(ext));
39 id->GetIncrements(this->Increments[0], this->Increments[1],
40 this->Increments[2]);
41 id->GetContinuousIncrements(ext,this->ContinuousIncrements[0],
42 this->ContinuousIncrements[1],
43 this->ContinuousIncrements[2]);
44 this->EndPointer =
45 static_cast<DType *>(id->GetScalarPointer(ext[1],ext[3],ext[5]))
46 +this->Increments[0];
47
48 // if the extent is empty then the end pointer should equal the beg pointer
49 if (ext[1] < ext[0] || ext[3] < ext[2] || ext[5] < ext[4])
50 {
51 this->EndPointer = this->Pointer;
52 }
53
54 this->SpanEndPointer =
55 this->Pointer + this->Increments[0]*(ext[1] - ext[0] + 1);
56 this->SliceEndPointer =
57 this->Pointer + this->Increments[1]*(ext[3] - ext[2] + 1);
58 }
59
60 //----------------------------------------------------------------------------
61 template <class DType>
vtkImageIterator(vtkImageData * id,int * ext)62 vtkImageIterator<DType>::vtkImageIterator(vtkImageData *id, int *ext)
63 {
64 this->Initialize(id, ext);
65 }
66
67
68 //----------------------------------------------------------------------------
69 template <class DType>
NextSpan()70 void vtkImageIterator<DType>::NextSpan()
71 {
72 this->Pointer += this->Increments[1];
73 this->SpanEndPointer += this->Increments[1];
74 if (this->Pointer >= this->SliceEndPointer)
75 {
76 this->Pointer += this->ContinuousIncrements[2];
77 this->SpanEndPointer += this->ContinuousIncrements[2];
78 this->SliceEndPointer += this->Increments[2];
79 }
80 }
81
82 #endif
83