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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageMathematics.cxx,v $
  Language:  C++
  Date:      $Date: 2002/06/14 18:22:21 $
  Version:   $Revision: 1.42 $

  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 "vtkImageMathematics.h"
#include "vtkImageData.h"
#include "vtkObjectFactory.h"

#include <math.h>

vtkCxxRevisionMacro(vtkImageMathematics, "$Revision: 1.42 $");
vtkStandardNewMacro(vtkImageMathematics);

//----------------------------------------------------------------------------
vtkImageMathematics::vtkImageMathematics()
{
  this->Operation = VTK_ADD;
  this->ConstantK = 1.0;
  this->ConstantC = 0.0;
  this->DivideByZeroToC = 0;
}



//----------------------------------------------------------------------------
// The output extent is the intersection.
void vtkImageMathematics::ExecuteInformation(vtkImageData **inDatas, 
                                             vtkImageData *outData)
{
  int ext[6], *ext2, idx;

  inDatas[0]->GetWholeExtent(ext);

  // two input take intersection
  if (this->Operation == VTK_ADD || this->Operation == VTK_SUBTRACT || 
      this->Operation == VTK_MULTIPLY || this->Operation == VTK_DIVIDE ||
      this->Operation == VTK_MIN || this->Operation == VTK_MAX || 
      this->Operation == VTK_ATAN2) 
    {
    ext2 = this->GetInput(1)->GetWholeExtent();
    for (idx = 0; idx < 3; ++idx)
      {
      if (ext2[idx*2] > ext[idx*2])
        {
        ext[idx*2] = ext2[idx*2];
        }
      if (ext2[idx*2+1] < ext[idx*2+1])
        {
        ext[idx*2+1] = ext2[idx*2+1];
        }
      }
    }
  
  outData->SetWholeExtent(ext);
}

template <class TValue, class TIvar>
void vtkImageMathematicsClamp(TValue &value, TIvar ivar, vtkImageData *data)
{
  if (ivar < (TIvar) data->GetScalarTypeMin())
    {
    value = (TValue) data->GetScalarTypeMin();
    }
  else if (ivar > (TIvar) data->GetScalarTypeMax())
    {
    value = (TValue) data->GetScalarTypeMax();
    }
  else
    {
    value = (TValue) ivar;
    }
}

//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
// Handles the one input operations
template <class T>
void vtkImageMathematicsExecute1(vtkImageMathematics *self,
                                 vtkImageData *in1Data, T *in1Ptr,
                                 vtkImageData *outData, T *outPtr,
                                 int outExt[6], int id)
{
  int idxR, idxY, idxZ;
  int maxY, maxZ;
  int inIncX, inIncY, inIncZ;
  int outIncX, outIncY, outIncZ;
  int rowLength;
  unsigned long count = 0;
  unsigned long target;
  int op = self->GetOperation();
  
  // find the region to loop over
  rowLength = (outExt[1] - outExt[0]+1)*in1Data->GetNumberOfScalarComponents();
  // What a pain.  Maybe I should just make another filter.
  if (op == VTK_CONJUGATE)
    {
    rowLength = (outExt[1] - outExt[0] + 1);
    }
  maxY = outExt[3] - outExt[2]; 
  maxZ = outExt[5] - outExt[4];
  target = (unsigned long)((maxZ+1)*(maxY+1)/50.0);
  target++;
  
  // Get increments to march through data 
  in1Data->GetContinuousIncrements(outExt, inIncX, inIncY, inIncZ);
  outData->GetContinuousIncrements(outExt, outIncX, outIncY, outIncZ);

  int DivideByZeroToC = self->GetDivideByZeroToC();
  double doubleConstantk = self->GetConstantK();

  // Avoid casts by making constants the same type as input/output
  // Of course they must be clamped to a valid range for the scalar type
  T constantk; vtkImageMathematicsClamp(constantk, self->GetConstantK(), in1Data);
  T constantc; vtkImageMathematicsClamp(constantc, self->GetConstantC(), in1Data);

  // Loop through output pixels
  for (idxZ = 0; idxZ <= maxZ; idxZ++)
    {
    for (idxY = 0; idxY <= maxY; idxY++)
      {
      if (!id) 
        {
        if (!(count%target))
          {
          self->UpdateProgress(count/(50.0*target));
          }
        count++;
        }
      for (idxR = 0; idxR < rowLength; idxR++)
        {
        // Pixel operaton
        switch (op)
          {
          case VTK_INVERT:
            if (*in1Ptr)
              {
              *outPtr = (T)(1.0 / *in1Ptr);
              }
            else
              {
              if ( DivideByZeroToC )
                {
                *outPtr = constantc;
                }
              else
                {
                *outPtr = (T)outData->GetScalarTypeMax();
                }
              }
            break;
          case VTK_SIN:
            *outPtr = (T)(sin((double)*in1Ptr));
            break;
          case VTK_COS:
            *outPtr = (T)(cos((double)*in1Ptr));
            break;
          case VTK_EXP:
            *outPtr = (T)(exp((double)*in1Ptr));
            break;
          case VTK_LOG:
            *outPtr = (T)(log((double)*in1Ptr));
            break;
          case VTK_ABS:
            *outPtr = (T)(fabs((double)*in1Ptr));
            break;
          case VTK_SQR:
            *outPtr = (T)(*in1Ptr * *in1Ptr);
            break;
          case VTK_SQRT:
            *outPtr = (T)(sqrt((double)*in1Ptr));
            break;
          case VTK_ATAN:
            *outPtr = (T)(atan((double)*in1Ptr));
            break;
          case VTK_MULTIPLYBYK:
            *outPtr = (T)(doubleConstantk * (double) *in1Ptr);
            break;
          case VTK_ADDC:
            *outPtr = constantc + *in1Ptr;
            break;
          case VTK_REPLACECBYK:
            *outPtr = (*in1Ptr == constantc) ? constantk : *in1Ptr;
            break;
          case VTK_CONJUGATE:
            outPtr[0] = in1Ptr[0];
            outPtr[1] = (T)(-1.0*(double)(in1Ptr[1]));
            // Why bother trying to figure out the continuous increments.
            outPtr++;
            in1Ptr++;
            break;
          }
        outPtr++;
        in1Ptr++;
        }
      outPtr += outIncY;
      in1Ptr += inIncY;
      }
    outPtr += outIncZ;
    in1Ptr += inIncZ;
    }
}



//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
// Handles the two input operations
template <class T>
void vtkImageMathematicsExecute2(vtkImageMathematics *self,
                                 vtkImageData *in1Data, T *in1Ptr,
                                 vtkImageData *in2Data, T *in2Ptr,
                                 vtkImageData *outData, T *outPtr,
                                 int outExt[6], int id)
{
  int idxR, idxY, idxZ;
  int maxY, maxZ;
  int inIncX, inIncY, inIncZ;
  int in2IncX, in2IncY, in2IncZ;
  int outIncX, outIncY, outIncZ;
  int rowLength;
  unsigned long count = 0;
  unsigned long target;
  int op = self->GetOperation();
  int DivideByZeroToC = self->GetDivideByZeroToC();
  double constantc = self->GetConstantC();
  
  // find the region to loop over
  rowLength = (outExt[1] - outExt[0]+1)*in1Data->GetNumberOfScalarComponents();
  // What a pain.  Maybe I should just make another filter.
  if (op == VTK_COMPLEX_MULTIPLY)
    {
    rowLength = (outExt[1] - outExt[0]+1);
    }

  maxY = outExt[3] - outExt[2]; 
  maxZ = outExt[5] - outExt[4];
  target = (unsigned long)((maxZ+1)*(maxY+1)/50.0);
  target++;
  
  // Get increments to march through data 
  in1Data->GetContinuousIncrements(outExt, inIncX, inIncY, inIncZ);
  in2Data->GetContinuousIncrements(outExt, in2IncX, in2IncY, in2IncZ);
  outData->GetContinuousIncrements(outExt, outIncX, outIncY, outIncZ);

  // Loop through ouput pixels
  for (idxZ = 0; idxZ <= maxZ; idxZ++)
    {
    for (idxY = 0; !self->AbortExecute && idxY <= maxY; idxY++)
      {
      if (!id) 
        {
        if (!(count%target))
          {
          self->UpdateProgress(count/(50.0*target));
          }
        count++;
        }
      for (idxR = 0; idxR < rowLength; idxR++)
        {
        // Pixel operation
        switch (op)
          {
          case VTK_ADD:
            *outPtr = *in1Ptr + *in2Ptr;
            break;
          case VTK_SUBTRACT:
            *outPtr = *in1Ptr - *in2Ptr;
            break;
          case VTK_MULTIPLY:
            *outPtr = *in1Ptr * *in2Ptr;
            break;
          case VTK_DIVIDE:
            if (*in2Ptr)
              {
              *outPtr = *in1Ptr / *in2Ptr;
              }
            else
              {
              if ( DivideByZeroToC )
                {
                *outPtr = (T) constantc;
                }
              else
                {
                // *outPtr = (T)(*in1Ptr / 0.00001);
                *outPtr = (T)outData->GetScalarTypeMax();
                }
              }
            break;
          case VTK_MIN:
            if (*in1Ptr < *in2Ptr)
              {
              *outPtr = *in1Ptr;
              }
            else
              {
              *outPtr = *in2Ptr;
              }
            break;
          case VTK_MAX:
            if (*in1Ptr > *in2Ptr)
              {
              *outPtr = *in1Ptr;
              }
            else
              {
              *outPtr = *in2Ptr;
              }
            break;
          case VTK_ATAN2:
              if (*in1Ptr == 0.0 && *in2Ptr == 0.0)
                {
                *outPtr = 0;
                }
              else
                {
                *outPtr =  (T)atan2((double)*in1Ptr,(double)*in2Ptr);
                }
            break;
          case VTK_COMPLEX_MULTIPLY:
            outPtr[0] = in1Ptr[0] * in2Ptr[0] - in1Ptr[1] * in2Ptr[1];
            outPtr[1] = in1Ptr[1] * in2Ptr[0] + in1Ptr[0] * in2Ptr[1];
            // Why bother trtying to figure out the continuous increments.
            outPtr++;
            in1Ptr++;
            in2Ptr++;
            break;
          }
        outPtr++;
        in1Ptr++;
        in2Ptr++;
        }
      outPtr += outIncY;
      in1Ptr += inIncY;
      in2Ptr += in2IncY;
      }
    outPtr += outIncZ;
    in1Ptr += inIncZ;
    in2Ptr += in2IncZ;
    }
}


//----------------------------------------------------------------------------
// This method is passed a input and output datas, and executes the filter
// algorithm to fill the output from the inputs.
// It just executes a switch statement to call the correct function for
// the datas data types.
void vtkImageMathematics::ThreadedExecute(vtkImageData **inData, 
                                          vtkImageData *outData,
                                          int outExt[6], int id)
{
  void *inPtr1;
  void *outPtr;
  
  vtkDebugMacro(<< "Execute: inData = " << inData 
                << ", outData = " << outData);
  

  if (inData[0] == NULL)
    {
    vtkErrorMacro(<< "Input " << 0 << " must be specified.");
    return;
    }

  inPtr1 = inData[0]->GetScalarPointerForExtent(outExt);
  outPtr = outData->GetScalarPointerForExtent(outExt);
  

  if (this->Operation == VTK_ADD || this->Operation == VTK_SUBTRACT || 
      this->Operation == VTK_MULTIPLY || this->Operation == VTK_DIVIDE ||
      this->Operation == VTK_MIN || this->Operation == VTK_MAX || 
      this->Operation == VTK_ATAN2 || this->Operation == VTK_COMPLEX_MULTIPLY) 
    {
    void *inPtr2;
    
    if (inData[1] == NULL)
      {
      vtkErrorMacro(<< "Input " << 1 << " must be specified.");
      return;
      }

    if ( this->Operation == VTK_COMPLEX_MULTIPLY )
      {
      if (inData[0]->GetNumberOfScalarComponents() != 2 ||
          inData[1]->GetNumberOfScalarComponents() != 2)
        {
        vtkErrorMacro("Complex inputs must have two components.");
        return;
        }
      }

    inPtr2 = inData[1]->GetScalarPointerForExtent(outExt);

    // this filter expects that input is the same type as output.
    if (inData[0]->GetScalarType() != outData->GetScalarType())
      {
      vtkErrorMacro(<< "Execute: input1 ScalarType, "
                    <<  inData[0]->GetScalarType()
                    << ", must match output ScalarType "
                    << outData->GetScalarType());
      return;
      }
  
    if (inData[1]->GetScalarType() != outData->GetScalarType())
      {
      vtkErrorMacro(<< "Execute: input2 ScalarType, "
                    << inData[1]->GetScalarType()
                    << ", must match output ScalarType "
                  << outData->GetScalarType());
      return;
      }
  
    // this filter expects that inputs that have the same number of components
    if (inData[0]->GetNumberOfScalarComponents() != 
        inData[1]->GetNumberOfScalarComponents())
      {
      vtkErrorMacro(<< "Execute: input1 NumberOfScalarComponents, "
                    << inData[0]->GetNumberOfScalarComponents()
                    << ", must match out input2 NumberOfScalarComponents "
                    << inData[1]->GetNumberOfScalarComponents());
      return;
      }
    
    switch (inData[0]->GetScalarType())
      {
      vtkTemplateMacro9(vtkImageMathematicsExecute2,
                        this,inData[0], (VTK_TT *)(inPtr1), 
                        inData[1], (VTK_TT *)(inPtr2), 
                        outData, (VTK_TT *)(outPtr), outExt, id);
      default:
        vtkErrorMacro(<< "Execute: Unknown ScalarType");
        return;
      }
    }
  else
    {
    // this filter expects that input is the same type as output.
    if (inData[0]->GetScalarType() != outData->GetScalarType())
      {
      vtkErrorMacro(<< "Execute: input ScalarType, " << inData[0]->GetScalarType()
      << ", must match out ScalarType " << outData->GetScalarType());
      return;
      }

    if ( this->Operation == VTK_CONJUGATE )
      {
      if (inData[0]->GetNumberOfScalarComponents() != 2)
        {
        vtkErrorMacro("Complex inputs must have two components.");
        return;
        }
      }

    switch (inData[0]->GetScalarType())
      {
      vtkTemplateMacro7(vtkImageMathematicsExecute1,
                        this, inData[0], (VTK_TT *)(inPtr1), 
                        outData, (VTK_TT *)(outPtr), outExt, id);
      default:
        vtkErrorMacro(<< "Execute: Unknown ScalarType");
        return;
      }
    }
}

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

  os << indent << "Operation: " << this->Operation << "\n";
  os << indent << "ConstantK: " << this->ConstantK << "\n";
  os << indent << "ConstantC: " << this->ConstantC << "\n";
  os << indent << "DivideByZeroToC: ";
  if ( this->DivideByZeroToC )
    {
    os << "On\n";
    }
  else
    {
    os << "Off\n";
    }
}

