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vtkImageWeightedSum.cxx
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vtkImageWeightedSum.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageWeightedSum.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 "vtkImageWeightedSum.h"
#include "vtkObjectFactory.h"
#include "vtkDoubleArray.h"
#include "vtkImageData.h"
#include "vtkImageIterator.h"
#include "vtkImageProgressIterator.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkDataSetAttributes.h"
vtkStandardNewMacro(vtkImageWeightedSum);
vtkCxxSetObjectMacro(vtkImageWeightedSum,Weights,vtkDoubleArray);
//----------------------------------------------------------------------------
// Description:
// Constructor sets default values
vtkImageWeightedSum::vtkImageWeightedSum()
{
this->SetNumberOfInputPorts(1);
// array of weights: need as many weights as inputs
this->Weights = vtkDoubleArray::New();
// By default normalize
this->NormalizeByWeight = 1;
}
//----------------------------------------------------------------------------
vtkImageWeightedSum::~vtkImageWeightedSum()
{
this->Weights->Delete();
}
//----------------------------------------------------------------------------
void vtkImageWeightedSum::SetWeight(vtkIdType id, double weight)
{
// Reallocate if needed and pass the new weight
this->Weights->InsertValue(id, weight);
}
//----------------------------------------------------------------------------
double vtkImageWeightedSum::CalculateTotalWeight()
{
double totalWeight = 0.0;
for(int i = 0; i < this->Weights->GetNumberOfTuples(); ++i)
{
totalWeight += this->Weights->GetValue(i);
}
return totalWeight;
}
//----------------------------------------------------------------------------
// Description:
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageWeightedSumExecute(vtkImageWeightedSum *self,
vtkImageData **inDatas, int numInputs, vtkImageData *outData,
int outExt[6], int id, T*)
{
vtkImageIterator<T> inItsFast[256];
T* inSIFast[256];
vtkImageProgressIterator<T> outIt(outData, outExt, self, id);
double *weights =
static_cast<vtkDoubleArray *>(self->GetWeights())->GetPointer(0);
double totalWeight = self->CalculateTotalWeight();
int normalize = self->GetNormalizeByWeight();
vtkImageIterator<T> *inIts;
T* *inSI;
if( numInputs < 256)
{
inIts = inItsFast;
inSI = inSIFast;
}
else
{
inIts = new vtkImageIterator<T>[numInputs];
inSI = new T*[numInputs];
}
// Loop through all input ImageData to initialize iterators
for(int i=0; i < numInputs; ++i)
{
inIts[i].Initialize(inDatas[i], outExt);
}
// Loop through output pixels
while (!outIt.IsAtEnd())
{
for(int j=0; j < numInputs; ++j)
{
inSI[j] = inIts[j].BeginSpan();
}
T* outSI = outIt.BeginSpan();
T* outSIEnd = outIt.EndSpan();
// Pixel operation
while (outSI != outSIEnd)
{
double sum = 0.;
for(int k=0; k < numInputs; ++k)
{
sum += weights[k] * *inSI[k];
}
// Divide only if needed and different from 0
if (normalize && totalWeight != 0.0)
{
sum /= totalWeight;
}
*outSI = static_cast<T>(sum); // do the cast only at the end
outSI++;
for(int l=0; l < numInputs; ++l)
{
inSI[l]++;
}
}
for(int j=0; j < numInputs; ++j)
{
inIts[j].NextSpan();
}
outIt.NextSpan();
}
if( numInputs >= 256)
{
delete[] inIts;
delete[] inSI;
}
}
//----------------------------------------------------------------------------
int vtkImageWeightedSum::RequestInformation (
vtkInformation * vtkNotUsed(request),
vtkInformationVector** inputVector,
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation* outInfo = outputVector->GetInformationObject(0);
int numInputs = this->GetNumberOfInputConnections(0);
if(!numInputs)
{
return 0;
}
int outputType = VTK_DOUBLE;
vtkInformation *info = inputVector[0]->GetInformationObject(0);
vtkInformation *scalarInfo = vtkDataObject::GetActiveFieldInformation(info,
vtkDataObject::FIELD_ASSOCIATION_POINTS, vtkDataSetAttributes::SCALARS);
if (scalarInfo)
{
outputType = scalarInfo->Get( vtkDataObject::FIELD_ARRAY_TYPE() );
}
int type;
for (int whichInput = 1; whichInput < numInputs; whichInput++)
{
vtkInformation *inInfo = inputVector[0]->GetInformationObject(whichInput);
vtkInformation *inScalarInfo = vtkDataObject::GetActiveFieldInformation(inInfo,
vtkDataObject::FIELD_ASSOCIATION_POINTS, vtkDataSetAttributes::SCALARS);
if (inScalarInfo)
{
type = inScalarInfo->Get( vtkDataObject::FIELD_ARRAY_TYPE() );
// Should we also check weight[whichInput] != 0
if( type != outputType )
{
// Could be more fancy
outputType = VTK_DOUBLE;
}
}
}
vtkDataObject::SetPointDataActiveScalarInfo(outInfo, outputType, 1);
return 1;
}
//----------------------------------------------------------------------------
// Description:
// This method is passed a input and output data, and executes the filter
// algorithm to fill the output from the input.
// It just executes a switch statement to call the correct function for
// the datas data types.
void vtkImageWeightedSum::ThreadedRequestData (
vtkInformation * vtkNotUsed( request ),
vtkInformationVector** vtkNotUsed( inputVector ),
vtkInformationVector * vtkNotUsed( outputVector ),
vtkImageData ***inData,
vtkImageData **outData,
int outExt[6], int id)
{
if (inData[0][0] == NULL)
{
vtkErrorMacro(<< "Input " << 0 << " must be specified.");
return;
}
int numInputs = this->GetNumberOfInputConnections(0);
int numWeights = this->Weights->GetNumberOfTuples();
if(numWeights != numInputs)
{
if (id == 0)
{
vtkErrorMacro("ThreadedRequestData: There are " << numInputs
<< " vtkImageData inputs provided but only "
<< numWeights << " weights provided");
}
return;
}
int scalarType = inData[0][0]->GetScalarType();
int numComp = inData[0][0]->GetNumberOfScalarComponents();
for (int i = 1; i < numInputs; ++i)
{
int otherType = inData[0][i]->GetScalarType();
int otherComp = inData[0][i]->GetNumberOfScalarComponents();
if (otherType != scalarType || otherComp != numComp)
{
if (id == 0)
{
vtkErrorMacro("ThreadedRequestData: Input " << i
<< " has " << otherComp << " components of type "
<< otherType << ", but input 0 has " << numComp
<< " components of type " << scalarType);
}
return;
}
}
switch (scalarType)
{
vtkTemplateMacro(
vtkImageWeightedSumExecute(this, inData[0], numInputs,
outData[0], outExt, id, static_cast<VTK_TT *>(0))
);
default:
if (id == 0)
{
vtkErrorMacro(<< "Execute: Unknown ScalarType");
}
return;
}
}
//----------------------------------------------------------------------------
int vtkImageWeightedSum::FillInputPortInformation(int i, vtkInformation* info)
{
info->Set(vtkAlgorithm::INPUT_IS_REPEATABLE(), 1);
return this->Superclass::FillInputPortInformation(i,info);
}
//----------------------------------------------------------------------------
void vtkImageWeightedSum::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
// objects
os << indent << "NormalizeByWeight: " <<
(this->NormalizeByWeight ? "On" : "Off" ) << "\n";
os << indent << "Weights: " << this->Weights << "\n";
this->Weights->PrintSelf(os,indent.GetNextIndent());
}