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/*=========================================================================
*
* 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 itkPixelAccessor_h
#define itkPixelAccessor_h
#include "itkMacro.h"
namespace itk
{
/**
* \class PixelAccessor
* \brief Give access to partial aspects of a type
*
* PixelAccessor is templated over an internal type and an
* external type representation. This class encapsulates a
* customized conversion between the internal and external
* type representations.
*
* PixelAccessor is designed to be used in conjunction with
* ImageAdaptors. An ImageAdaptor take an image and present it
* as another image in which the pixels are a pixel-to-pixel
* modification of the original image.
*
* ImageAdaptors are intended to perform task similar to ImageFilters,
* but reducing the overhead in memory allocation, at the price of some
* reduction in performance.
*
* ImageAdaptors are templated over a PixelAccessor class that
* will define what kind of transformation is applied to the
* pixel data. Typical uses of PixelAccessor include basic type
* casting, (e.g. make a float image looks like a unsigned int image).
*
* Every Image has a default PixelAccessor that performs an identity
* operation. ImageIterators use the PixelAccessor defined by the image
* in order to get and set the values of pixels.
*
* \ingroup ImageAdaptors
* \ingroup ITKImageAdaptors
*/
template <typename TInternalType, typename TExternalType>
class PixelAccessor
{
public:
/** External type alias. It defines the external aspect
* that this class will exhibit. */
using ExternalType = TExternalType;
/** Internal type alias. It defines the internal real
* representation of data. */
using InternalType = TInternalType;
inline void
Set(TInternalType & output, const TExternalType & input) const
{
output = (TInternalType)input;
}
inline TExternalType
Get(const TInternalType & input) const
{
return (TExternalType)input;
}
};
} // end namespace itk
#endif
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