h6. [[FilterManager]] h6(. » [[FilterManager SWI Calls|SWI Calls]] h6((. » [[Filter_RegisterRectFilter]] h6(((. » Pre Rectangle Filter Code h2. Pre Rectangle Filter Code |_<^{width:5em}. Entry | | |<^. R2 |<^. Task handle| |<^. R6 |<^. Minimum x| |<^. R7 |<^. Minimum y| |<^. R8 |<^. Maximum x| |<^. R9 |<^. Maximum y| |<^. R12|<^. Value of R2 when filter registered| |_<^{width:5em}. Exit | | |<. R0|<. All registers preserved| h4. Notes This is called before the redraw of a rectangle begins, before the window background has been filled, and before the VDU graphics window has been set up. h4. See also * [[Filter_DeRegisterRectFilter]] * [[Filter_RegisterRectFilter]]