12define('QR_FIND_BEST_MASK',true);// if true, estimates best mask (spec. default, but extremally slow; set to false to significant performance boost but (propably) worst quality code
13define('QR_FIND_FROM_RANDOM',false);// if false, checks all masks available, otherwise value tells count of masks need to be checked, mask id are got randomly
14define('QR_DEFAULT_MASK',2);// when QR_FIND_BEST_MASK === false