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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageToStructuredPoints.cxx,v $
  Language:  C++
  Date:      $Date: 2002/12/17 02:07:36 $
  Version:   $Revision: 1.52 $

  Copyright (c) 1993-2002 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 "vtkImageToStructuredPoints.h"

#include "vtkCellData.h"
#include "vtkFieldData.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkStructuredPoints.h"

#include <math.h>

vtkCxxRevisionMacro(vtkImageToStructuredPoints, "$Revision: 1.52 $");
vtkStandardNewMacro(vtkImageToStructuredPoints);

//----------------------------------------------------------------------------
vtkImageToStructuredPoints::vtkImageToStructuredPoints()
{
  this->Translate[0] = this->Translate[1] = this->Translate[2] = 0;
  this->NumberOfRequiredInputs = 1;
  this->SetNthOutput(0,vtkStructuredPoints::New());
  this->Outputs[0]->Delete();
}

//----------------------------------------------------------------------------
vtkImageToStructuredPoints::~vtkImageToStructuredPoints()
{
}


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

//----------------------------------------------------------------------------
vtkStructuredPoints *vtkImageToStructuredPoints::GetOutput()
{
  if (this->NumberOfOutputs < 1)
    {
    return NULL;
    }
  
  return (vtkStructuredPoints *)(this->Outputs[0]);
}

//----------------------------------------------------------------------------
void vtkImageToStructuredPoints::SetInput(vtkImageData *input)
{
  this->vtkProcessObject::SetNthInput(0, input);
}

//----------------------------------------------------------------------------
vtkImageData *vtkImageToStructuredPoints::GetInput()
{
  if (this->NumberOfInputs < 1)
    {
    return NULL;
    }
  
  return (vtkImageData *)(this->Inputs[0]);
}


//----------------------------------------------------------------------------
void vtkImageToStructuredPoints::SetVectorInput(vtkImageData *input)
{
  this->vtkProcessObject::SetNthInput(1, input);
}

//----------------------------------------------------------------------------
vtkImageData *vtkImageToStructuredPoints::GetVectorInput()
{
  if (this->NumberOfInputs < 2)
    {
    return NULL;
    }
  
  return (vtkImageData *)(this->Inputs[1]);
}




//----------------------------------------------------------------------------
void vtkImageToStructuredPoints::Execute()
{
  int uExtent[6];
  int *wExtent;

  int idxX, idxY, idxZ;
  int maxX = 0;
  int maxY = 0;
  int maxZ = 0;;
  int inIncX, inIncY, inIncZ, rowLength;
  unsigned char *inPtr1, *inPtr, *outPtr;
  vtkStructuredPoints *output = this->GetOutput();
  vtkImageData *data = this->GetInput();
  vtkImageData *vData = this->GetVectorInput();
  
  if (!data && !vData)
    {
    vtkErrorMacro("Unable to generate data!");
    return;
    }

  output->GetUpdateExtent(uExtent);
  output->SetExtent(uExtent);

  uExtent[0] += this->Translate[0];
  uExtent[1] += this->Translate[0];
  uExtent[2] += this->Translate[1];
  uExtent[3] += this->Translate[1];
  uExtent[4] += this->Translate[2];
  uExtent[5] += this->Translate[2];
  
  // if the data extent matches the update extent then just pass the data
  // otherwise we must reformat and copy the data
  if (data)
    {
    wExtent = data->GetExtent();
    if (wExtent[0] == uExtent[0] && wExtent[1] == uExtent[1] &&
        wExtent[2] == uExtent[2] && wExtent[3] == uExtent[3] &&
        wExtent[4] == uExtent[4] && wExtent[5] == uExtent[5])
      {
      if (data->GetPointData())
        {
        output->GetPointData()->PassData(data->GetPointData());
        }
      if (data->GetCellData())
        {
        output->GetCellData()->PassData(data->GetCellData());
        }
      if (data->GetFieldData())
        {
        output->GetFieldData()->ShallowCopy(data->GetFieldData());
        }
      }
    else
      {
      inPtr = (unsigned char *) data->GetScalarPointerForExtent(uExtent);
      outPtr = (unsigned char *) output->GetScalarPointer();
      
      // Get increments to march through data 
      data->GetIncrements(inIncX, inIncY, inIncZ);
      
      // find the region to loop over
      rowLength = (uExtent[1] - uExtent[0]+1)*inIncX*data->GetScalarSize();
      maxX = uExtent[1] - uExtent[0]; 
      maxY = uExtent[3] - uExtent[2]; 
      maxZ = uExtent[5] - uExtent[4];
      inIncY *= data->GetScalarSize();
      inIncZ *= data->GetScalarSize();
      
      // Loop through output pixels
      for (idxZ = 0; idxZ <= maxZ; idxZ++)
        {
        inPtr1 = inPtr + idxZ*inIncZ;
        for (idxY = 0; idxY <= maxY; idxY++)
          {
          memcpy(outPtr,inPtr1,rowLength);
          inPtr1 += inIncY;
          outPtr += rowLength;
          }
        }
      }
    }
    
  if (vData)
    {
    // if the data extent matches the update extent then just pass the data
    // otherwise we must reformat and copy the data
    wExtent = vData->GetExtent();
    if (wExtent[0] == uExtent[0] && wExtent[1] == uExtent[1] &&
        wExtent[2] == uExtent[2] && wExtent[3] == uExtent[3] &&
        wExtent[4] == uExtent[4] && wExtent[5] == uExtent[5])
      {
      output->GetPointData()->SetVectors(vData->GetPointData()->GetScalars());
      }
    else
      {
      vtkDataArray *fv = vtkDataArray::CreateDataArray(vData->GetScalarType());
      float *inPtr2 = (float *)(vData->GetScalarPointerForExtent(uExtent));
      
      fv->SetNumberOfComponents(3);
      fv->SetNumberOfTuples((maxZ+1)*(maxY+1)*(maxX+1));
      vData->GetContinuousIncrements(uExtent, inIncX, inIncY, inIncZ);
      int numComp = vData->GetNumberOfScalarComponents();
      int idx = 0;
      
      // Loop through ouput pixels
      for (idxZ = 0; idxZ <= maxZ; idxZ++)
        {
        for (idxY = 0; idxY <= maxY; idxY++)
          {
          for (idxX = 0; idxX <= maxX; idxX++)
            {
            fv->SetTuple(idx,inPtr2);
            inPtr2 += numComp;
            idx++;
            }
          inPtr2 += inIncY;
          }
        inPtr2 += inIncZ;
        }
      output->GetPointData()->SetVectors(fv);
      fv->Delete();
      }
    }
}

//----------------------------------------------------------------------------
// Copy WholeExtent, Spacing and Origin.
void vtkImageToStructuredPoints::ExecuteInformation()
{
  vtkImageData *input = this->GetInput();
  vtkImageData *vInput = this->GetVectorInput();
  vtkStructuredPoints *output = this->GetOutput();
  int whole[6], *tmp;
  float *spacing, origin[3];
  
  if (output == NULL)
    {
    return;
    }
  
  if (input)
    {
    output->SetScalarType(input->GetScalarType());
    output->SetNumberOfScalarComponents(input->GetNumberOfScalarComponents());
    input->GetWholeExtent(whole);    
    spacing = input->GetSpacing();
    input->GetOrigin(origin);
    }
  else if (vInput)
    {
    whole[0] = whole[2] = whole[4] = -VTK_LARGE_INTEGER;
    whole[1] = whole[3] = whole[5] = VTK_LARGE_INTEGER;
    spacing = vInput->GetSpacing();
    vInput->GetOrigin(origin);
    }
  else
    {
    return;
    }
  // intersections for whole extent
  if (vInput)
    {
    tmp = vInput->GetWholeExtent();
    if (tmp[0] > whole[0]) {whole[0] = tmp[0];}
    if (tmp[2] > whole[2]) {whole[2] = tmp[2];}
    if (tmp[4] > whole[4]) {whole[4] = tmp[4];}
    if (tmp[1] < whole[1]) {whole[1] = tmp[1];}
    if (tmp[3] < whole[1]) {whole[3] = tmp[3];}
    if (tmp[5] < whole[1]) {whole[5] = tmp[5];}
    }
    
  // slide min extent to 0,0,0 (I Hate this !!!!)
  this->Translate[0] = whole[0];
  this->Translate[1] = whole[2];
  this->Translate[2] = whole[4];
  
  origin[0] += spacing[0] * whole[0];
  origin[1] += spacing[1] * whole[2];
  origin[2] += spacing[2] * whole[4];
  whole[1] -= whole[0];
  whole[3] -= whole[2];
  whole[5] -= whole[4];
  whole[0] = whole[2] = whole[4] = 0;
  
  output->SetWholeExtent(whole);
  // Now should Origin and Spacing really be part of information?
  // How about xyx arrays in RectilinearGrid of Points in StructuredGrid?
  output->SetOrigin(origin);
  output->SetSpacing(spacing);
}

//----------------------------------------------------------------------------
vtkStructuredPoints *vtkImageToStructuredPoints::GetOutput(int idx)
{
  return (vtkStructuredPoints *) this->vtkSource::GetOutput(idx); 
}

//----------------------------------------------------------------------------
void vtkImageToStructuredPoints::ComputeInputUpdateExtents(vtkDataObject *data)
{
  vtkStructuredPoints *output = (vtkStructuredPoints*)data;
  int ext[6];
  vtkImageData *input;

  output->GetUpdateExtent(ext);
  ext[0] += this->Translate[0];
  ext[1] += this->Translate[0];
  ext[2] += this->Translate[1];
  ext[3] += this->Translate[1];
  ext[4] += this->Translate[2];
  ext[5] += this->Translate[2];
  
  input = this->GetInput();
  if (input)
    {
    input->SetUpdateExtent(ext);
    }

  input = this->GetVectorInput();
  if (input)
    {
    input->SetUpdateExtent(ext);
    }
}




