cuda-samples/Common/UtilNPP/Pixel.h

/* Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 */


#ifndef NV_UTIL_PIXEL_H
#define NV_UTIL_PIXEL_H

#include "Exceptions.h"

namespace npp
{
    template <typename D, size_t N>
    struct Pixel
    { };

    template <typename D>
    struct Pixel<D, 1>
    {
        D x;

        const D &
        operator[](size_t iChannel)
        const
        {
            NPP_ASSERT(iChannel < 1);
            return (&x)[iChannel];
        }

        D &
        operator[](size_t iChannel)
        {
            NPP_ASSERT(iChannel < 1);
            return (&x)[iChannel];
        }
    };

    template <typename D>
    struct Pixel<D, 2>
    {
        D x,y;

        const D &
        operator[](size_t iChannel)
        const
        {
            NPP_ASSERT(iChannel < 2);
            return (&x)[iChannel];
        }

        D &
        operator[](size_t iChannel)
        {
            NPP_ASSERT(iChannel < 2);
            return (&x)[iChannel];
        }
    };

    template <typename D>
    struct Pixel<D, 3>
    {
        D x,y,z;

        const D &
        operator[](size_t iChannel)
        const
        {
            NPP_ASSERT(iChannel < 3);
            return (&x)[iChannel];
        }

        D &
        operator[](size_t iChannel)
        {
            NPP_ASSERT(iChannel < 3);
            return (&x)[iChannel];
        }
    };

    template <typename D>
    struct Pixel<D, 4>
    {
        D x, y, z, w;

        const D &
        operator[](size_t iChannel)
        const
        {
            NPP_ASSERT(iChannel < 4);
            return (&x)[iChannel];
        }

        D &
        operator[](size_t iChannel)
        {
            NPP_ASSERT(iChannel < 4);
            return (&x)[iChannel];
        }
    };

} // npp namespace

#endif // NV_UTIL_PIXEL_H