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Pre Rectangle Filter Code
Programmer's Reference Manuals
» Part 7 - The Desktop
» The Filter Manager
» 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.