Function randShuffle_

deps/opencv/modules/core/src/rand.cpp:827–853

{

template<typename T> static void
randShuffle_( Mat& _arr, RNG& rng, double iterFactor )
{
    int sz = _arr.rows*_arr.cols, iters = cvRound(iterFactor*sz);
    if( _arr.isContinuous() )
    {
        T* arr = (T*)_arr.data;
        for( int i = 0; i < iters; i++ )
        {
            int j = (unsigned)rng % sz, k = (unsigned)rng % sz;
            std::swap( arr[j], arr[k] );
        }
    }
    else
    {
        uchar* data = _arr.data;
        size_t step = _arr.step;
        int cols = _arr.cols;
        for( int i = 0; i < iters; i++ )
        {
            int j1 = (unsigned)rng % sz, k1 = (unsigned)rng % sz;
            int j0 = j1/cols, k0 = k1/cols;
            j1 -= j0*cols; k1 -= k0*cols;
            std::swap( ((T*)(data + step*j0))[j1], ((T*)(data + step*k0))[k1] );
        }
    }
}

typedef void (*RandShuffleFunc)( Mat& dst, RNG& rng, double iterFactor );