/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImagePadFilter.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 "vtkImagePadFilter.h"

#include "vtkImageData.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkDataSetAttributes.h"
#include "vtkStreamingDemandDrivenPipeline.h"

vtkCxxRevisionMacro(vtkImagePadFilter, "$Revision: 1.34 $");
vtkStandardNewMacro(vtkImagePadFilter);

//----------------------------------------------------------------------------
// Constructor sets default values
vtkImagePadFilter::vtkImagePadFilter()
{
  int idx;

  // Initialize output image extent to INVALID
  for (idx = 0; idx < 3; ++idx)
    {
    this->OutputWholeExtent[idx * 2] = 0;
    this->OutputWholeExtent[idx * 2 + 1] = -1;
    }
  // Set Output numberOfScalarComponents to INVALID
  this->OutputNumberOfScalarComponents = -1;
}

//----------------------------------------------------------------------------
void vtkImagePadFilter::SetOutputWholeExtent(int extent[6])
{
  int idx, modified = 0;
  
  for (idx = 0; idx < 6; ++idx)
    {
    if (this->OutputWholeExtent[idx] != extent[idx])
      {
      this->OutputWholeExtent[idx] = extent[idx];
      modified = 1;
      }
    }

  if (modified)
    {
    this->Modified();
    }
}
//----------------------------------------------------------------------------
void vtkImagePadFilter::SetOutputWholeExtent(int minX, int maxX, 
                                             int minY, int maxY,
                                             int minZ, int maxZ)
{
  int extent[6];
  
  extent[0] = minX;  extent[1] = maxX;
  extent[2] = minY;  extent[3] = maxY;
  extent[4] = minZ;  extent[5] = maxZ;
  this->SetOutputWholeExtent(extent);
}


//----------------------------------------------------------------------------
void vtkImagePadFilter::GetOutputWholeExtent(int extent[6])
{
  int idx;
  
  for (idx = 0; idx < 6; ++idx)
    {
    extent[idx] = this->OutputWholeExtent[idx];
    }
}


//----------------------------------------------------------------------------
// Just change the Image extent.
int vtkImagePadFilter::RequestInformation (
  vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector,
  vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);

  if (this->OutputWholeExtent[0] > this->OutputWholeExtent[1])
    {
    // invalid setting, it has not been set, so default to whole Extent
    inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
                this->OutputWholeExtent);
    }
  outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
               this->OutputWholeExtent,6);
  
  if (this->OutputNumberOfScalarComponents < 0)
    {
    vtkInformation *inScalarInfo = vtkDataObject::GetActiveFieldInformation(inInfo, 
      vtkDataObject::FIELD_ASSOCIATION_POINTS, vtkDataSetAttributes::SCALARS);
    if (!inScalarInfo)
      {
      vtkErrorMacro("Missing scalar field on input information!");
      return 0;
      }
    // invalid setting, it has not been set, so default to input.
    this->OutputNumberOfScalarComponents 
      = inScalarInfo->Get(vtkDataObject::FIELD_NUMBER_OF_COMPONENTS());
    }
  vtkDataObject::SetPointDataActiveScalarInfo(outInfo, -1, 
    this->OutputNumberOfScalarComponents);
  return 1;
}

void vtkImagePadFilter::ComputeInputUpdateExtent (int inExt[6], 
                                                  int outExt[6], 
                                                  int wholeExtent[6])
{
  int idx;
  
  // Clip
  for (idx = 0; idx < 3; ++idx)
    {
    inExt[idx*2] = outExt[idx*2];
    inExt[idx*2+1] = outExt[idx*2+1];    
    if (inExt[idx*2] < wholeExtent[idx*2])
      {
      inExt[idx*2] = wholeExtent[idx*2];
      }
    if (inExt[idx*2] > wholeExtent[idx*2 + 1])
      {
      inExt[idx*2] = wholeExtent[idx*2 + 1];
      }
    if (inExt[idx*2+1] < wholeExtent[idx*2])
      {
      inExt[idx*2+1] = wholeExtent[idx*2];
      }
    if (inExt[idx*2 + 1] > wholeExtent[idx*2 + 1])
      {
      inExt[idx*2 + 1] = wholeExtent[idx*2 + 1];
      }
    }  
}

//----------------------------------------------------------------------------
// Just clip the request.  The subclass may need to overwrite this method.
int vtkImagePadFilter::RequestUpdateExtent (
  vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector,
  vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);

  int wholeExtent[6];
  int inExt[6];
  
  // handle XYZ
  inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),wholeExtent);
  outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(),inExt);
  
  this->ComputeInputUpdateExtent(inExt, inExt, wholeExtent);
  
  inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(),inExt,6);

  return 1;
}

void vtkImagePadFilter::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  os << indent << "OutputNumberOfScalarComponents: " 
     << this->OutputNumberOfScalarComponents << "\n";
}