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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageThreshold.cxx,v $
  Language:  C++
  Date:      $Date: 2002/09/25 23:31:10 $
  Version:   $Revision: 1.41 $

  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 "vtkImageThreshold.h"

#include "vtkImageData.h"
#include "vtkImageProgressIterator.h"
#include "vtkObjectFactory.h"

vtkCxxRevisionMacro(vtkImageThreshold, "$Revision: 1.41 $");
vtkStandardNewMacro(vtkImageThreshold);

//----------------------------------------------------------------------------
// Constructor sets default values
vtkImageThreshold::vtkImageThreshold()
{
  this->UpperThreshold = VTK_LARGE_FLOAT;
  this->LowerThreshold = -VTK_LARGE_FLOAT;
  this->ReplaceIn = 0;
  this->InValue = 0.0;
  this->ReplaceOut = 0;
  this->OutValue = 0.0;

  this->OutputScalarType = -1; // invalid; output same as input
}


//----------------------------------------------------------------------------
void vtkImageThreshold::SetInValue(float val)
{
  if (val != this->InValue || this->ReplaceIn != 1)
    {
    this->InValue = val;
    this->ReplaceIn = 1;
    this->Modified();
    }
}

//----------------------------------------------------------------------------
void vtkImageThreshold::SetOutValue(float val)
{
  if (val != this->OutValue || this->ReplaceOut != 1)
    {
    this->OutValue = val;
    this->ReplaceOut = 1;
    this->Modified();
    }
}



//----------------------------------------------------------------------------
// The values greater than or equal to the value match.
void vtkImageThreshold::ThresholdByUpper(float thresh)
{
  if (this->LowerThreshold != thresh || this->UpperThreshold < VTK_LARGE_FLOAT)
    {
    this->LowerThreshold = thresh;
    this->UpperThreshold = VTK_LARGE_FLOAT;
    this->Modified();
    }
}


//----------------------------------------------------------------------------
// The values less than or equal to the value match.
void vtkImageThreshold::ThresholdByLower(float thresh)
{
  if (this->UpperThreshold != thresh || this->LowerThreshold > -VTK_LARGE_FLOAT)
    {
    this->UpperThreshold = thresh;
    this->LowerThreshold = -VTK_LARGE_FLOAT;
    this->Modified();
    }
}


//----------------------------------------------------------------------------
// The values in a range (inclusive) match
void vtkImageThreshold::ThresholdBetween(float lower, float upper)
{
  if (this->LowerThreshold != lower || this->UpperThreshold != upper)
    {
    this->LowerThreshold = lower;
    this->UpperThreshold = upper;
    this->Modified();
    }
}

//----------------------------------------------------------------------------
void vtkImageThreshold::ExecuteInformation(vtkImageData *inData, 
                                           vtkImageData *outData)
{
  if (this->OutputScalarType != -1)
    {
    outData->SetScalarType(this->OutputScalarType);
    }
  else
    {
    outData->SetScalarType(inData->GetScalarType());
    }
}



//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class IT, class OT>
void vtkImageThresholdExecute(vtkImageThreshold *self,
                              vtkImageData *inData,
                              vtkImageData *outData, 
                              int outExt[6], int id, IT *, OT *)
{
  vtkImageIterator<IT> inIt(inData, outExt);
  vtkImageProgressIterator<OT> outIt(outData, outExt, self, id);
  IT  lowerThreshold;
  IT  upperThreshold;
  int replaceIn = self->GetReplaceIn();
  OT  inValue;
  int replaceOut = self->GetReplaceOut();
  OT  outValue;
  IT temp;
  
  // Make sure the thresholds are valid for the input scalar range
  if (static_cast<double>(self->GetLowerThreshold()) < inData->GetScalarTypeMin())
    {
    lowerThreshold = (IT) inData->GetScalarTypeMin();
    }
  else 
    {
    if (static_cast<double>(self->GetLowerThreshold()) >
        inData->GetScalarTypeMax())
      {
      lowerThreshold = (IT) inData->GetScalarTypeMax();
      }
    else
      {
      lowerThreshold = (IT) self->GetLowerThreshold();
      }
    }
  if (static_cast<double>(self->GetUpperThreshold())
      > inData->GetScalarTypeMax())
    {
    upperThreshold = (IT) inData->GetScalarTypeMax();
    }
  else 
    {
    if (static_cast<double>(self->GetUpperThreshold())
        < inData->GetScalarTypeMin())
      {
      upperThreshold = (IT) inData->GetScalarTypeMin();
      }
    else
      {
      upperThreshold = (IT) self->GetUpperThreshold();
      }
    }
  
  // Make sure the replacement values are within the output scalar range
  if (static_cast<double>(self->GetInValue()) < outData->GetScalarTypeMin())
    {
    inValue = (OT) outData->GetScalarTypeMin();
    }
  else 
    {
    if (static_cast<double>(self->GetInValue()) > outData->GetScalarTypeMax())
      {
      inValue = (OT) outData->GetScalarTypeMax();
      }
    else
      {
      inValue = (OT) self->GetInValue();
      }
    }
  if (static_cast<double>(self->GetOutValue()) > outData->GetScalarTypeMax())
    {
    outValue = (OT) outData->GetScalarTypeMax();
    }
  else 
    {
    if (static_cast<double>(self->GetOutValue()) < outData->GetScalarTypeMin())
      {
      outValue = (OT) outData->GetScalarTypeMin();
      }
    else
      {
      outValue = (OT) self->GetOutValue();
      }
    }
  
  // Loop through output pixels
  while (!outIt.IsAtEnd())
    {
    IT* inSI = inIt.BeginSpan();
    OT* outSI = outIt.BeginSpan();
    OT* outSIEnd = outIt.EndSpan();
    while (outSI != outSIEnd)
      {
      // Pixel operation
      temp = (*inSI);
      if (lowerThreshold <= temp && temp <= upperThreshold)
        {
        // match
        if (replaceIn)
          {
          *outSI = inValue;
          }
        else
          {
          *outSI = (OT)(temp);
          }
        }
      else
        {
        // not match
        if (replaceOut)
          {
          *outSI = outValue;
          }
        else
          {
          *outSI = (OT)(temp);
          }
        }
      ++inSI;
      ++outSI;
      }
    inIt.NextSpan();
    outIt.NextSpan();
    }
}


//----------------------------------------------------------------------------
template <class T>
void vtkImageThresholdExecute1(vtkImageThreshold *self,
                               vtkImageData *inData,
                               vtkImageData *outData,
                               int outExt[6], int id, T *)
{
  switch (outData->GetScalarType())
    {
    vtkTemplateMacro7(vtkImageThresholdExecute, self, inData,
                      outData, outExt, id, 
                      static_cast<T *>(0), static_cast<VTK_TT *>(0));
    default:
      vtkGenericWarningMacro("Execute: Unknown input ScalarType");
      return;
    }
}



//----------------------------------------------------------------------------
// This method is passed a input and output data, and executes the filter
// algorithm to fill the output from the input.
// It just executes a switch statement to call the correct function for
// the datas data types.
void vtkImageThreshold::ThreadedExecute(vtkImageData *inData, 
                                        vtkImageData *outData,
                                        int outExt[6], int id)
{
  switch (inData->GetScalarType())
    {
    vtkTemplateMacro6(vtkImageThresholdExecute1, this, inData, 
                      outData, outExt, id, 
                      static_cast<VTK_TT *>(0));
    default:
      vtkErrorMacro(<< "Execute: Unknown input ScalarType");
      return;
    }
}

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

  os << indent << "OutputScalarType: " << this->OutputScalarType << "\n";
  os << indent << "InValue: " << this->InValue << "\n";
  os << indent << "OutValue: " << this->OutValue << "\n";
  os << indent << "LowerThreshold: " << this->LowerThreshold << "\n";
  os << indent << "UpperThreshold: " << this->UpperThreshold << "\n";
  os << indent << "ReplaceIn: " << this->ReplaceIn << "\n";
  os << indent << "ReplaceOut: " << this->ReplaceOut << "\n";
}

