Portals.h

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//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt 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.
//============================================================================
#ifndef vtk_m_worklet_colorconversion_Portals_h
#define vtk_m_worklet_colorconversion_Portals_h
 
#include <vtkm/VectorAnalysis.h>
 
namespace vtkm
{
namespace worklet
{
namespace colorconversion
{
 
struct MagnitudePortal
{
  template <typename T, int N>
  VTKM_EXEC auto operator()(const vtkm::Vec<T, N>& values) const
    -> decltype(vtkm::Magnitude(values))
  { //Should we be using RMag?
    return vtkm::Magnitude(values);
  }
};
 
struct ComponentPortal
{
  vtkm::IdComponent Component;
 
  ComponentPortal()
    : Component(0)
  {
  }
 
  ComponentPortal(vtkm::IdComponent comp)
    : Component(comp)
  {
  }
 
  template <typename T>
  VTKM_EXEC auto operator()(T&& value) const ->
    typename std::remove_reference<decltype(value[vtkm::IdComponent{}])>::type
  {
    return value[this->Component];
  }
};
}
}
}
#endif