Src' value: 00r00!  EMRPLGBLT addClassConstant: '_OffsetOf_xMask' value: 00r00!  EMRPLGBLT addClassConstant: '_OffsetOf_xSrc' value: 00r00!  EMRPLGBLT addClassConstant: '_OffsetOf_yMask' value: 00r00!  EMRPLGBLT addClassConstant: '_OffsetOf_y