h6. [[FilterManager]] h6(. » [[FilterManager SWI Calls|SWI Calls]] h6((. » Filter_RegisterPosticonFilter h2. Filter_RegisterPostIconFilter h5. (SWI &4264A) |_<^. Entry | | |<^. R0 |<^. Pointer to zero terminated filter name| |<^. R1 |<^. Address of [[Wimp_GetRectangle Icon Filter Code]]| |<^. R2 |<^. Value to be passed to filter code in R12 | |<^. R3 |<^. Task handle of task to which filter is applied, or 0 for all tasks | |_<^. Exit | |<. All registers preserved| h4. Use The purpose of this call is to add a new [[Wimp_GetRectangle]] icon plotting filter to the list of post-filters. h4. Notes The filter routine address pointed to by R1 will be called whenever the task who's handle is passed in R3 calls [[Wimp_GetRectangle]]. It will be called just after the windows icons have been plotted. h4. See also * [[Filter_DeRegisterPostIconFilter]]