opencv/3rdparty/carotene/src/common.cpp

/*
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 *
 *                           License Agreement
 *                For Open Source Computer Vision Library
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 *
 * Copyright (C) 2014, NVIDIA Corporation, all rights reserved.
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 *
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 * are permitted provided that the following conditions are met:
 *
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 *     this list of conditions and the following disclaimer.
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 *     may be used to endorse or promote products derived from this software
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 * This software is provided by the copyright holders and contributors "as is" and
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#include <cstdlib>
#include <iostream>

#include "common.hpp"

namespace CAROTENE_NS {

bool isSupportedConfiguration()
{
#ifdef CAROTENE_NEON
    return true;
#else
    return false;
#endif
}

namespace internal {

void assertSupportedConfiguration(bool parametersSupported)
{
    if (!isSupportedConfiguration()) {
        std::cerr << "internal error: attempted to use an unavailable function" << std::endl;
        std::abort();
    }

    if (!parametersSupported) {
        std::cerr << "internal error: attempted to use a function with unsupported parameters" << std::endl;
        std::abort();
    }
}

ptrdiff_t borderInterpolate(ptrdiff_t _p, size_t _len, BORDER_MODE borderType, size_t startMargin, size_t endMargin)
{
    ptrdiff_t p = _p + (ptrdiff_t)startMargin;
    size_t len = _len + startMargin + endMargin;
    if( (size_t)p < len )
        return _p;
    else if( borderType == BORDER_MODE_REPLICATE )
        p = p < 0 ? 0 : (ptrdiff_t)len - 1;
    else if( borderType == BORDER_MODE_REFLECT || borderType == BORDER_MODE_REFLECT101 )
    {
        s32 delta = borderType == BORDER_MODE_REFLECT101;
        if( len == 1 )
            return 0;
        do
        {
            if( p < 0 )
                p = -p - 1 + delta;
            else
                p = (ptrdiff_t)len - 1 - (p - (ptrdiff_t)len) - delta;
        }
        while( (size_t)p >= len );
    }
    else if( borderType == BORDER_MODE_WRAP )
    {
        if( p < 0 )
            p -= ((p-(ptrdiff_t)len+1)/(ptrdiff_t)len)*(ptrdiff_t)len;
        if( p >= (ptrdiff_t)len )
            p %= (ptrdiff_t)len;
    }
    else if( borderType == BORDER_MODE_CONSTANT )
        p = -1;
    else
        internal::assertSupportedConfiguration(false);
    return p - (ptrdiff_t)startMargin;
}

} // namespace internal
} // namespace CAROTENE_NS