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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageLuminance.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 "vtkImageLuminance.h"
#include "vtkImageData.h"
#include "vtkImageProgressIterator.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include <math.h>
vtkStandardNewMacro(vtkImageLuminance);
//----------------------------------------------------------------------------
vtkImageLuminance::vtkImageLuminance()
{
this->SetNumberOfInputPorts(1);
this->SetNumberOfOutputPorts(1);
}
//----------------------------------------------------------------------------
// This method overrides information set by parent's ExecuteInformation.
int vtkImageLuminance::RequestInformation (
vtkInformation * vtkNotUsed( request ),
vtkInformationVector** vtkNotUsed( inputVector ),
vtkInformationVector * outputVector)
{
vtkDataObject::SetPointDataActiveScalarInfo(
outputVector->GetInformationObject(0), -1, 1);
return 1;
}
//----------------------------------------------------------------------------
// This execute method handles boundaries.
// it handles boundaries. Pixels are just replicated to get values
// out of extent.
template <class T>
void vtkImageLuminanceExecute(vtkImageLuminance *self, vtkImageData *inData,
vtkImageData *outData,
int outExt[6], int id, T *)
{
vtkImageIterator<T> inIt(inData, outExt);
vtkImageProgressIterator<T> outIt(outData, outExt, self, id);
float luminance;
// Loop through ouput pixels
while (!outIt.IsAtEnd())
{
T* inSI = inIt.BeginSpan();
T* outSI = outIt.BeginSpan();
T* outSIEnd = outIt.EndSpan();
while (outSI != outSIEnd)
{
// now process the components
luminance = 0.30 * *inSI++;
luminance += 0.59 * *inSI++;
luminance += 0.11 * *inSI++;
*outSI = static_cast<T>(luminance);
++outSI;
}
inIt.NextSpan();
outIt.NextSpan();
}
}
//----------------------------------------------------------------------------
// This method contains a switch statement that calls the correct
// templated function for the input data type. The output data
// must match input type. This method does handle boundary conditions.
void vtkImageLuminance::ThreadedExecute (vtkImageData *inData,
vtkImageData *outData,
int outExt[6], int id)
{
vtkDebugMacro(<< "Execute: inData = " << inData
<< ", outData = " << outData);
// this filter expects that input is the same type as output.
if (inData->GetNumberOfScalarComponents() != 3)
{
vtkErrorMacro(<< "Execute: input must have 3 components, but has "
<< inData->GetNumberOfScalarComponents());
return;
}
// this filter expects that input is the same type as output.
if (inData->GetScalarType() != outData->GetScalarType())
{
vtkErrorMacro(<< "Execute: input ScalarType, " << inData->GetScalarType()
<< ", must match out ScalarType " << outData->GetScalarType());
return;
}
switch (inData->GetScalarType())
{
vtkTemplateMacro(
vtkImageLuminanceExecute( this, inData, outData,
outExt, id, static_cast<VTK_TT *>(0)));
default:
vtkErrorMacro(<< "Execute: Unknown ScalarType");
return;
}
}
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