OS_SpriteOp 23 (Rev #1)
OS SWI Calls
» OS_SpriteOp
» OS_SpriteOp 23 – Create/read/remove sprite area MetaData
OS_SpriteOp 23 – Create/read/remove sprite area MetaData
(SWI &2E)
| Entry | |
|---|---|
| R0 | 39 (Reason code) + Area value |
| R1 | Sprite area (as defined by area value in R0) |
| R3 | -1 → Read MetaData |
| else Length of MetaData | |
| R4 | -1 → Remove MetaData |
| 0 → zero-initialise | |
| else uPtr to MetaData to write | |
| R5 | FourCC identifier |
| or 1-based index |
| Exit | |
|---|---|
| If R3 = -1 on entry: | |
| R3 | Size of MetaData (bytes), 0 if none |
| R4 | aPtr to MetaData, or 0 if none |
| R5 | FourCC identifier |
| All other registers preserved | |
Use
This call allows MetaData to be added or removed from the sprite area’s Extension Area, or for the size and location of MetaData to be read.
Notes
This SpriteOp is provided by Cerilica’s MetaSprite module.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.