value /= (src_desc.upper - src_desc.lower); // normalize range
value *= (_desc.upper - _desc.lower); // scale to our range
value += _desc.lower; // translate to our offset
value /= (src_desc.upper - src_desc.lower); // normalize range
value *= (_desc.upper - _desc.lower); // scale to our range
value += _desc.lower; // translate to our offset