Method SparseMat

deps/opencv/modules/core/src/matrix.cpp:3624–3654

SparseMat::SparseMat(const Mat& m)
: flags(MAGIC_VAL), hdr(0)
{
    create( m.dims, m.size, m.type() );

    int i, idx[CV_MAX_DIM] = {0}, d = m.dims, lastSize = m.size[d - 1];
    size_t esz = m.elemSize();
    uchar* dptr = m.data;

    for(;;)
    {
        for( i = 0; i < lastSize; i++, dptr += esz )
        {
            if( isZeroElem(dptr, esz) )
                continue;
            idx[d-1] = i;
            uchar* to = newNode(idx, hash(idx));
            copyElem( dptr, to, esz );
        }

        for( i = d - 2; i >= 0; i-- )
        {
            dptr += m.step[i] - m.size[i+1]*m.step[i+1];
            if( ++idx[i] < m.size[i] )
                break;
            idx[i] = 0;
        }
        if( i < 0 )
            break;
    }
}

SparseMat::SparseMat(const CvSparseMat* m)
: flags(MAGIC_VAL), hdr(0)