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vtkImageShiftScale.cxx
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vtkImageShiftScale.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageShiftScale.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 "vtkImageShiftScale.h"
#include "vtkImageData.h"
#include "vtkImageProgressIterator.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
vtkStandardNewMacro(vtkImageShiftScale);
//----------------------------------------------------------------------------
vtkImageShiftScale::vtkImageShiftScale()
{
this->Shift = 0.0;
this->Scale = 1.0;
this->OutputScalarType = -1;
this->ClampOverflow = 0;
}
//----------------------------------------------------------------------------
vtkImageShiftScale::~vtkImageShiftScale()
{
}
//----------------------------------------------------------------------------
void vtkImageShiftScale::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Shift: " << this->Shift << "\n";
os << indent << "Scale: " << this->Scale << "\n";
os << indent << "Output Scalar Type: " << this->OutputScalarType << "\n";
os << indent << "ClampOverflow: " << (this->ClampOverflow? "On" : "Off")
<< "\n";
}
//----------------------------------------------------------------------------
int vtkImageShiftScale::RequestInformation(vtkInformation*,
vtkInformationVector**,
vtkInformationVector* outputVector)
{
// Set the image scalar type for the output.
if(this->OutputScalarType != -1)
{
vtkInformation* outInfo = outputVector->GetInformationObject(0);
vtkDataObject::SetPointDataActiveScalarInfo(
outInfo, this->OutputScalarType, -1);
}
return 1;
}
//----------------------------------------------------------------------------
// This function template implements the filter for any type of data.
// The last two arguments help the vtkTemplateMacro calls below
// instantiate the proper input and output types.
template <class IT, class OT>
void vtkImageShiftScaleExecute(vtkImageShiftScale* self,
vtkImageData* inData,
vtkImageData* outData,
int outExt[6], int id,
IT*, OT*)
{
// Create iterators for the input and output extents assigned to
// this thread.
vtkImageIterator<IT> inIt(inData, outExt);
vtkImageProgressIterator<OT> outIt(outData, outExt, self, id);
// Get the shift and scale parameters values.
double shift = self->GetShift();
double scale = self->GetScale();
// Clamp pixel values within the range of the output type.
double typeMin = outData->GetScalarTypeMin();
double typeMax = outData->GetScalarTypeMax();
int clamp = self->GetClampOverflow();
// Loop through output pixels.
while (!outIt.IsAtEnd())
{
IT* inSI = inIt.BeginSpan();
OT* outSI = outIt.BeginSpan();
OT* outSIEnd = outIt.EndSpan();
if (clamp)
{
while (outSI != outSIEnd)
{
// Pixel operation
double val = (static_cast<double>(*inSI) + shift) * scale;
if (val > typeMax)
{
val = typeMax;
}
if (val < typeMin)
{
val = typeMin;
}
*outSI = static_cast<OT>(val);
++outSI;
++inSI;
}
}
else
{
while (outSI != outSIEnd)
{
// Pixel operation
double val = (static_cast<double>(*inSI) + shift) * scale;
// NB: without clamping, this cast may result in undefined behavior!
*outSI = static_cast<OT>(val);
++outSI;
++inSI;
}
}
inIt.NextSpan();
outIt.NextSpan();
}
}
//----------------------------------------------------------------------------
template <class T>
void vtkImageShiftScaleExecute1(vtkImageShiftScale* self,
vtkImageData* inData,
vtkImageData* outData,
int outExt[6], int id, T*)
{
switch (outData->GetScalarType())
{
vtkTemplateMacro(
vtkImageShiftScaleExecute(self, inData,
outData, outExt, id,
static_cast<T*>(0),
static_cast<VTK_TT*>(0)));
default:
vtkErrorWithObjectMacro(
self, "ThreadedRequestData: Unknown output ScalarType");
return;
}
}
//----------------------------------------------------------------------------
// 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 vtkImageShiftScale::ThreadedRequestData(vtkInformation*,
vtkInformationVector**,
vtkInformationVector*,
vtkImageData*** inData,
vtkImageData** outData,
int outExt[6],
int threadId)
{
vtkImageData* input = inData[0][0];
vtkImageData* output = outData[0];
switch(input->GetScalarType())
{
vtkTemplateMacro(
vtkImageShiftScaleExecute1(this, input, output, outExt, threadId,
static_cast<VTK_TT*>(0)));
default:
vtkErrorMacro("ThreadedRequestData: Unknown input ScalarType");
return;
}
}