Pre Rectangle Filter Code
FilterManager
» SWI Calls
» Filter_RegisterRectFilter
» Pre Rectangle Filter Code
Pre Rectangle Filter Code
| Entry | |
|---|---|
| R2 | Task handle |
| R6 | Minimum x |
| R7 | Minimum y |
| R8 | Maximum x |
| R9 | Maximum y |
| R12 | Value of R2 when filter registered |
| Exit | |
|---|---|
| R0 | All registers preserved |
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.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.