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vtkImagePointDataIterator.cxx
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vtkImagePointDataIterator.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImagePointDataIterator.cxx
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.
=========================================================================*/
#include "vtkImagePointDataIterator.h"
#include "vtkAlgorithm.h"
#include "vtkDataArray.h"
#include "vtkImageData.h"
#include "vtkImageStencilData.h"
#include "vtkPointData.h"
#include <algorithm>
//------------------------------------------------------------------------------
class vtkImageStencilIteratorFriendship
{
public:
static int* GetExtentListLengths(vtkImageStencilData* stencil)
{
return stencil->ExtentListLengths;
}
static int** GetExtentLists(vtkImageStencilData* stencil) { return stencil->ExtentLists; }
};
//------------------------------------------------------------------------------
vtkImagePointDataIterator::vtkImagePointDataIterator()
{
this->Id = 0;
this->SpanEnd = 0;
this->RowEnd = 0;
this->SliceEnd = 0;
this->End = 0;
this->RowEndIncrement = 0;
this->RowIncrement = 0;
this->SliceEndIncrement = 0;
this->SliceIncrement = 0;
this->Extent[0] = 0;
this->Extent[1] = 0;
this->Extent[2] = 0;
this->Extent[3] = 0;
this->Extent[4] = 0;
this->Extent[5] = 0;
this->Index[0] = 0;
this->Index[1] = 0;
this->Index[2] = 0;
this->StartY = 0;
this->HasStencil = false;
this->InStencil = false;
this->SpanSliceEndIncrement = 0;
this->SpanSliceIncrement = 0;
this->SpanIndex = 0;
this->SpanCountPointer = nullptr;
this->SpanListPointer = nullptr;
this->Algorithm = nullptr;
this->Count = 0;
this->Target = 0;
this->ThreadId = 0;
}
//------------------------------------------------------------------------------
void vtkImagePointDataIterator::Initialize(vtkImageData* image, const int extent[6],
vtkImageStencilData* stencil, vtkAlgorithm* algorithm, int threadId)
{
const int* dataExtent = image->GetExtent();
if (extent == nullptr)
{
extent = dataExtent;
}
// Save the extent (will be adjusted if there is a stencil).
bool emptyExtent = false;
for (int i = 0; i < 6; i += 2)
{
this->Extent[i] = std::max(extent[i], dataExtent[i]);
this->Extent[i + 1] = std::min(extent[i + 1], dataExtent[i + 1]);
if (this->Extent[i] > this->Extent[i + 1])
{
emptyExtent = true;
}
}
// Compute the increments for marching through the data.
this->RowIncrement = dataExtent[1] - dataExtent[0] + 1;
this->SliceIncrement = this->RowIncrement * (dataExtent[3] - dataExtent[2] + 1);
int rowSpan, sliceSpan, volumeSpan;
if (!emptyExtent)
{
// Compute the span of the image region to be covered.
rowSpan = this->Extent[1] - this->Extent[0] + 1;
sliceSpan = this->Extent[3] - this->Extent[2] + 1;
volumeSpan = this->Extent[5] - this->Extent[4] + 1;
this->Id = (this->Extent[0] - dataExtent[0]) +
(this->Extent[2] - dataExtent[2]) * this->RowIncrement +
(this->Extent[4] - dataExtent[4]) * this->SliceIncrement;
// Compute the end increments (continuous increments).
this->RowEndIncrement = this->RowIncrement - rowSpan;
this->SliceEndIncrement =
this->RowEndIncrement + this->SliceIncrement - this->RowIncrement * sliceSpan;
}
else
{
// Extent is empty, IsAtEnd() will immediately return "true"
rowSpan = 0;
sliceSpan = 0;
volumeSpan = 0;
this->Id = 0;
this->RowEndIncrement = 0;
this->SliceEndIncrement = 0;
for (int i = 0; i < 6; i += 2)
{
this->Extent[i] = dataExtent[i];
this->Extent[i + 1] = dataExtent[i] - 1;
}
}
// Get the end pointers for row, slice, and volume.
this->SpanEnd = this->Id + rowSpan;
this->RowEnd = this->Id + rowSpan;
this->SliceEnd = this->Id + (this->RowIncrement * sliceSpan - this->RowEndIncrement);
this->End = this->Id + (this->SliceIncrement * volumeSpan - this->SliceEndIncrement);
// For keeping track of the current x,y,z index.
this->Index[0] = this->Extent[0];
this->Index[1] = this->Extent[2];
this->Index[2] = this->Extent[4];
// For resetting the Y index after each slice.
this->StartY = this->Index[1];
// Code for when a stencil is provided.
if (stencil)
{
this->HasStencil = true;
this->InStencil = false;
this->SpanIndex = 0;
int stencilExtent[6];
stencil->GetExtent(stencilExtent);
// The stencil has a YZ array of span lists, we need increments
// to get to the next Z position in the YZ array.
this->SpanSliceIncrement = 0;
this->SpanSliceEndIncrement = 0;
if (stencilExtent[3] >= stencilExtent[2] && stencilExtent[5] >= stencilExtent[4])
{
this->SpanSliceIncrement = stencilExtent[3] - stencilExtent[2] + 1;
int botOffset = this->Extent[2] - stencilExtent[2];
if (botOffset >= 0)
{
this->SpanSliceEndIncrement += botOffset;
}
int topOffset = stencilExtent[3] - this->Extent[3];
if (topOffset >= 0)
{
this->SpanSliceEndIncrement += topOffset;
}
}
// Find the offset to the start position within the YZ array.
vtkIdType startOffset = 0;
int yOffset = this->Extent[2] - stencilExtent[2];
if (yOffset < 0)
{
this->Extent[2] = stencilExtent[2];
// starting before start of stencil: subtract the increment that
// will be added in NextSpan() upon entry into stencil extent
startOffset -= 1;
}
else
{
// starting partway into the stencil, so add an offset
startOffset += yOffset;
}
if (stencilExtent[3] <= this->Extent[3])
{
this->Extent[3] = stencilExtent[3];
}
int zOffset = this->Extent[4] - stencilExtent[4];
if (zOffset < 0)
{
this->Extent[4] = stencilExtent[4];
// starting before start of stencil: subtract the increment that
// will be added in NextSpan() upon entry into stencil extent
if (yOffset >= 0)
{
startOffset -= 1 + this->SpanSliceEndIncrement;
}
}
else
{
// starting partway into the stencil, so add an offset
startOffset += zOffset * this->SpanSliceIncrement;
}
if (stencilExtent[5] <= this->Extent[5])
{
this->Extent[5] = stencilExtent[5];
}
if (this->Extent[2] <= this->Extent[3] && this->Extent[4] <= this->Extent[5])
{
this->SpanCountPointer =
vtkImageStencilIteratorFriendship::GetExtentListLengths(stencil) + startOffset;
this->SpanListPointer =
vtkImageStencilIteratorFriendship::GetExtentLists(stencil) + startOffset;
// Get the current position within the span list for the current row
if (yOffset >= 0 && zOffset >= 0)
{
// If starting within stencil extent, check stencil immediately
this->InStencil = true;
this->SetSpanState(this->Extent[0]);
}
}
else
{
this->SpanCountPointer = nullptr;
this->SpanListPointer = nullptr;
this->InStencil = false;
}
}
else
{
this->HasStencil = false;
this->InStencil = true;
this->SpanSliceEndIncrement = 0;
this->SpanSliceIncrement = 0;
this->SpanIndex = 0;
this->SpanCountPointer = nullptr;
this->SpanListPointer = nullptr;
}
if (algorithm)
{
this->Algorithm = algorithm;
vtkIdType maxCount = sliceSpan;
maxCount *= volumeSpan;
this->Target = maxCount / 50 + 1;
this->Count = this->Target * 50 - (maxCount / this->Target) * this->Target + 1;
this->ThreadId = threadId;
}
else
{
this->Algorithm = nullptr;
this->Target = 0;
this->Count = 0;
this->ThreadId = 0;
}
}
//------------------------------------------------------------------------------
void vtkImagePointDataIterator::SetSpanState(int idX)
{
// Find the span that includes idX
bool inStencil = false;
int* spans = *this->SpanListPointer;
int n = *this->SpanCountPointer;
int i;
for (i = 0; i < n; i++)
{
if (spans[i] > idX)
{
break;
}
inStencil = !inStencil;
}
// Set the primary span state variables
this->SpanIndex = i;
this->InStencil = inStencil;
// Clamp the span end to MaxX+1
int endIdX = this->Extent[1] + 1;
if (i < n && spans[i] <= this->Extent[1])
{
endIdX = spans[i];
}
// Compute the pointers for idX and endIdX
vtkIdType rowStart = this->RowEnd - (this->RowIncrement - this->RowEndIncrement);
this->Id = rowStart + (idX - this->Extent[0]);
this->SpanEnd = rowStart + (endIdX - this->Extent[0]);
}
//------------------------------------------------------------------------------
void vtkImagePointDataIterator::NextSpan()
{
if (this->SpanEnd == this->RowEnd)
{
int spanIncr = 1;
if (this->SpanEnd != this->SliceEnd)
{
// Move to the next row
this->Id = this->RowEnd + this->RowEndIncrement;
this->RowEnd += this->RowIncrement;
this->SpanEnd = this->RowEnd;
this->Index[1]++;
}
else if (this->SpanEnd != this->End)
{
// Move to the next slice
this->Id = this->SliceEnd + this->SliceEndIncrement;
this->SliceEnd += this->SliceIncrement;
this->RowEnd = this->Id + (this->RowIncrement - this->RowEndIncrement);
this->SpanEnd = this->RowEnd;
this->Index[1] = this->StartY;
this->Index[2]++;
spanIncr += this->SpanSliceEndIncrement;
}
else
{
// reached End
this->Id = this->End;
return;
}
// Start of next row
this->Index[0] = this->Extent[0];
if (this->HasStencil)
{
if ((this->Index[1] >= this->Extent[2]) && (this->Index[1] <= this->Extent[3]) &&
(this->Index[2] >= this->Extent[4]) && (this->Index[2] <= this->Extent[5]))
{
this->SpanCountPointer += spanIncr;
this->SpanListPointer += spanIncr;
this->SetSpanState(this->Extent[0]);
}
else
{
this->InStencil = false;
}
}
if (this->Algorithm)
{
this->ReportProgress();
}
}
else
{
// Move to the next span in the current row
this->Id = this->SpanEnd;
int spanCount = *this->SpanCountPointer;
int endIdX = this->Extent[1] + 1;
this->Index[0] = endIdX;
if (this->SpanIndex < spanCount)
{
int tmpIdX = (*this->SpanListPointer)[this->SpanIndex];
if (tmpIdX < endIdX)
{
this->Index[0] = tmpIdX;
}
}
// Get the index to the start of the span after the next
this->SpanIndex++;
if (this->SpanIndex < spanCount)
{
int tmpIdX = (*this->SpanListPointer)[this->SpanIndex];
if (tmpIdX < endIdX)
{
endIdX = tmpIdX;
}
}
// Compute the end of the span
this->SpanEnd =
this->RowEnd - (this->RowIncrement - this->RowEndIncrement) + (endIdX - this->Extent[0]);
// Flip the state
this->InStencil = !this->InStencil;
}
}
//------------------------------------------------------------------------------
void* vtkImagePointDataIterator::GetVoidPointer(
vtkDataArray* array, vtkIdType i, int* pixelIncrement)
{
int n = array->GetNumberOfComponents();
if (pixelIncrement)
{
*pixelIncrement = n;
}
return array->GetVoidPointer(i * n);
}
//------------------------------------------------------------------------------
void* vtkImagePointDataIterator::GetVoidPointer(
vtkImageData* image, vtkIdType i, int* pixelIncrement)
{
return vtkImagePointDataIterator::GetVoidPointer(
image->GetPointData()->GetScalars(), i, pixelIncrement);
}
//------------------------------------------------------------------------------
void vtkImagePointDataIterator::ReportProgress()
{
if (this->Count % this->Target == 0)
{
if (this->Algorithm->GetAbortExecute())
{
this->Id = this->End;
this->SpanEnd = this->End;
this->RowEnd = this->End;
this->SliceEnd = this->End;
}
else if (this->ThreadId == 0)
{
this->Algorithm->UpdateProgress(0.02 * (this->Count / this->Target));
}
}
this->Count++;
}