/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkLabelToRGBImageFilter_hxx
#define itkLabelToRGBImageFilter_hxx


/*
 *
 * This code was contributed in the Insight Journal paper:
 * "The watershed transform in ITK - discussion and new developments"
 * by Beare R., Lehmann G.
 * https://www.insight-journal.org/browse/publication/92
 *
 */

namespace itk
{
/**
 *
 */
template <typename TLabelImage, typename TOutputImage>
LabelToRGBImageFilter<TLabelImage, TOutputImage>::LabelToRGBImageFilter()
{
  m_BackgroundValue = LabelPixelType{};
  NumericTraits<OutputPixelType>::SetLength(m_BackgroundColor, 3);
  m_BackgroundColor.Fill(OutputPixelValueType{});
}

template <typename TLabelImage, typename TOutputImage>
unsigned int
LabelToRGBImageFilter<TLabelImage, TOutputImage>::GetNumberOfColors() const
{
  return this->GetFunctor().GetNumberOfColors();
}

template <typename TLabelImage, typename TOutputImage>
void
LabelToRGBImageFilter<TLabelImage, TOutputImage>::ResetColors()
{
  this->GetFunctor().ResetColors();
}

template <typename TLabelImage, typename TOutputImage>
void
LabelToRGBImageFilter<TLabelImage, TOutputImage>::AddColor(ComponentType r, ComponentType g, ComponentType b)
{
  this->GetFunctor().AddColor(r, g, b);
}

template <typename TLabelImage, typename TOutputImage>
void
LabelToRGBImageFilter<TLabelImage, TOutputImage>::GenerateOutputInformation()
{
  // this methods is overloaded so that if the output image is a
  // VectorImage then the correct number of components are set.

  Superclass::GenerateOutputInformation();
  OutputImageType * output = this->GetOutput();

  if (!output)
  {
    return;
  }
  if (output->GetNumberOfComponentsPerPixel() != 3)
  {
    output->SetNumberOfComponentsPerPixel(3);
  }
}

template <typename TLabelImage, typename TOutputImage>
void
LabelToRGBImageFilter<TLabelImage, TOutputImage>::BeforeThreadedGenerateData()
{
  this->GetFunctor().SetBackgroundValue(m_BackgroundValue);
  this->GetFunctor().SetBackgroundColor(m_BackgroundColor);
}

/**
 *
 */
template <typename TLabelImage, typename TOutputImage>
void
LabelToRGBImageFilter<TLabelImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);

  os << indent
     << "BackgroundValue: " << static_cast<typename NumericTraits<LabelPixelType>::PrintType>(m_BackgroundValue)
     << std::endl
     << indent
     << "ColorBackground: " << static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_BackgroundColor)
     << std::endl;
}
} // end namespace itk

#endif
