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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkImageSpatialFilter.cxx,v $
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 "vtkImageSpatialFilter.h"
#include "vtkDataArray.h"
#include "vtkImageData.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include <math.h>
vtkCxxRevisionMacro(vtkImageSpatialFilter, "$Revision: 1.52 $");
vtkStandardNewMacro(vtkImageSpatialFilter);
//----------------------------------------------------------------------------
// Construct an instance of vtkImageSpatialFilter fitler.
vtkImageSpatialFilter::vtkImageSpatialFilter()
{
this->KernelSize[0] = this->KernelSize[1] = this->KernelSize[2] = 1;
this->KernelMiddle[0] = this->KernelMiddle[1] = this->KernelMiddle[2] = 0;
this->HandleBoundaries = 1;
}
//----------------------------------------------------------------------------
void vtkImageSpatialFilter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
int idx;
os << indent << "KernelSize: (" << this->KernelSize[0];
for (idx = 1; idx < 3; ++idx)
{
os << ", " << this->KernelSize[idx];
}
os << ").\n";
os << indent << "KernelMiddle: (" << this->KernelMiddle[0];
for (idx = 1; idx < 3; ++idx)
{
os << ", " << this->KernelMiddle[idx];
}
os << ").\n";
}
//----------------------------------------------------------------------------
// This method is passed a region that holds the image extent of this filters
// input, and changes the region to hold the image extent of this filters
// output.
void vtkImageSpatialFilter::ExecuteInformation()
{
vtkImageData *input = this->GetInput();
vtkImageData *output = this->GetOutput();
if (!input)
{
vtkErrorMacro(<< "Input not set.");
return;
}
// Copy the defaults
output->CopyTypeSpecificInformation( input );
// Take this opportunity to override the defaults.
int extent[6];
input->GetWholeExtent(extent);
this->ComputeOutputWholeExtent(extent, this->HandleBoundaries);
output->SetWholeExtent(extent);
this->ExecuteInformation(input, output);
vtkDataArray *inArray;
inArray = input->GetPointData()->GetScalars(this->InputScalarsSelection);
if (inArray)
{
output->SetScalarType(inArray->GetDataType());
output->SetNumberOfScalarComponents(inArray->GetNumberOfComponents());
}
}
//----------------------------------------------------------------------------
void vtkImageSpatialFilter::ExecuteInformation(
vtkImageData *vtkNotUsed(inData), vtkImageData *vtkNotUsed(outData))
{
}
//----------------------------------------------------------------------------
// A helper method to compute output image extent
void vtkImageSpatialFilter::ComputeOutputWholeExtent(int extent[6],
int handleBoundaries)
{
int idx;
if ( ! handleBoundaries)
{
// Make extent a little smaller because of the kernel size.
for (idx = 0; idx < 3; ++idx)
{
extent[idx*2] += this->KernelMiddle[idx];
extent[idx*2+1] -= (this->KernelSize[idx]-1) - this->KernelMiddle[idx];
}
}
}
//----------------------------------------------------------------------------
// This method computes the extent of the input region necessary to generate
// an output region. Before this method is called "region" should have the
// extent of the output region. After this method finishes, "region" should
// have the extent of the required input region.
void vtkImageSpatialFilter::ComputeInputUpdateExtent(int extent[6],
int inExtent[6])
{
int idx;
int *wholeExtent;
if (!this->GetInput())
{
return;
}
wholeExtent = this->GetInput()->GetWholeExtent();
for (idx = 0; idx < 3; ++idx)
{
// Magnify by strides
extent[idx*2] = inExtent[idx*2];
extent[idx*2+1] = inExtent[idx*2+1];
// Expand to get inRegion Extent
extent[idx*2] -= this->KernelMiddle[idx];
extent[idx*2+1] += (this->KernelSize[idx]-1) - this->KernelMiddle[idx];
// If the expanded region is out of the IMAGE Extent (grow min)
if (extent[idx*2] < wholeExtent[idx*2])
{
if (this->HandleBoundaries)
{
// shrink the required region extent
extent[idx*2] = wholeExtent[idx*2];
}
else
{
vtkWarningMacro(<< "Required region is out of the image extent.");
}
}
// If the expanded region is out of the IMAGE Extent (shrink max)
if (extent[idx*2+1] > wholeExtent[idx*2+1])
{
if (this->HandleBoundaries)
{
// shrink the required region extent
extent[idx*2+1] = wholeExtent[idx*2+1];
}
else
{
vtkWarningMacro(<< "Required region is out of the image extent.");
}
}
}
}
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