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

  Program:   Visualization Toolkit
  Module:    vtkImageHSVToRGB.cxx

  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 "vtkImageHSVToRGB.h"

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

vtkStandardNewMacro(vtkImageHSVToRGB);

//----------------------------------------------------------------------------
vtkImageHSVToRGB::vtkImageHSVToRGB()
{
  this->Maximum = 255.0;
  this->SetNumberOfInputPorts(1);
  this->SetNumberOfOutputPorts(1);
}


//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageHSVToRGBExecute(vtkImageHSVToRGB *self,
                             vtkImageData *inData,
                             vtkImageData *outData,
                             int outExt[6], int id, T *)
{
  vtkImageIterator<T> inIt(inData, outExt);
  vtkImageProgressIterator<T> outIt(outData, outExt, self, id);
  double R, G, B, H, S, V;
  double max = self->GetMaximum();
  int idxC;
  
  // find the region to loop over
  int maxC = inData->GetNumberOfScalarComponents()-1;
  
  // Loop through ouput pixels
  while (!outIt.IsAtEnd())
    {
    T* inSI = inIt.BeginSpan();
    T* outSI = outIt.BeginSpan();
    T* outSIEnd = outIt.EndSpan();
    while (outSI != outSIEnd)
      {
      // Pixel operation
      H = static_cast<double>(*inSI) / max; ++inSI;
      S = static_cast<double>(*inSI) / max; ++inSI;
      V = static_cast<double>(*inSI) / max; ++inSI;

      vtkMath::HSVToRGB(H, S, V, &R, &G, &B);

      R *= max;
      G *= max;
      B *= max;

      if (R > max)
        {
        R = max;
        }
      if (G > max)
        {
        G = max;
        }
      if (B > max)
        {
        B = max;
        }
      
      // assign output.
      *outSI = static_cast<T>(R); ++outSI;
      *outSI = static_cast<T>(G); ++outSI;
      *outSI = static_cast<T>(B); ++outSI;
      
      for (idxC = 3; idxC <= maxC; idxC++)
        {
        *outSI++ = *inSI++;
        }
      }
    inIt.NextSpan();
    outIt.NextSpan();
    }
}

//----------------------------------------------------------------------------
void vtkImageHSVToRGB::ThreadedExecute (vtkImageData *inData, 
                                       vtkImageData *outData,
                                       int outExt[6], int id)
{
  vtkDebugMacro(<< "Execute: inData = " << inData 
  << ", outData = " << outData);
  
  // this filter expects that input is the same type as output.
  if (inData->GetScalarType() != outData->GetScalarType())
    {
    vtkErrorMacro(<< "Execute: input ScalarType, " << inData->GetScalarType()
    << ", must match out ScalarType " << outData->GetScalarType());
    return;
    }
  
  // need three components for input and output
  if (inData->GetNumberOfScalarComponents() < 3)
    {
    vtkErrorMacro("Input has too few components");
    return;
    }
  if (outData->GetNumberOfScalarComponents() < 3)
    {
    vtkErrorMacro("Output has too few components");
    return;
    }

  switch (inData->GetScalarType())
    {
    vtkTemplateMacro(
      vtkImageHSVToRGBExecute(this, inData, 
                              outData, outExt, id, static_cast<VTK_TT *>(0)));
    default:
      vtkErrorMacro(<< "Execute: Unknown ScalarType");
      return;
    }
}

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

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

