h6. [[FilterManager]] h6(. » [[FilterManager SWI Calls|SWI Calls]] h6((. » Filter_DeRegisterRectFilter h2. Filter_DeRegisterRectFilter h5. (SWI &42645) |_<^. Entry | | |<^. R0 |<^. Pointer to zero terminated filter name| |<^. R1 |<^. Address of [[Pre Rectangle Filter Code]]| |<^. R2 |<^. Value to be passed to R12 | |<^. R3 |<^. Task handle of task to which filter was applied | |_<^. Exit | |<. All registers preserved| h4. Use The purpose of this call is to add a remove a [[Wimp_GetRectangle]] filter from the list of pre-filters. h4. Notes All registers must be the same as those passed to [[Filter_RegisterPostRectFilter]]. h4. See also * [[Filter_RegisterRectFilter]]