ColourTrans_SetOppGCOL
ColourTrans
» SWI Calls
» ColourTrans_SetOppGCOL
ColourTrans_SetOppGCOL
(SWI &40748)
| Entry | |
|---|---|
| R0 | Palette entry |
| R3 | 0 for foreground, or 128 for background |
| R4 | GCOL action |
| Exit | |
|---|---|
| R0 | GCOL |
| R2 | Log2 of bits-per-pixel for current mode |
| R3 | Initial value AND &80 |
| R4 | Preserved |
Use
This purpose of this call is to calculate the furthest GCOL to the palette entry passed in R0 in the current mode and palette and set it.
Notes
The top three bits of R3 and R4 should be zero to allow for future expansion.
GCOL is only of use in 256 colour screen modes.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.