pub unsafe extern "C" fn GDALWarpDstAlphaMasker( pMaskFuncArg: *mut c_void, nBandCount: c_int, eType: Type, nXOff: c_int, nYOff: c_int, nXSize: c_int, nYSize: c_int, arg1: *mut *mut GByte, bMaskIsFloat: c_int, pValidityMask: *mut c_void) -> Type