OS_SetColour Flags (changes)
Showing changes from revision #3 to #4:
Added | Removed | Changed
OS SWI Calls
» OS_SetColour
» Flags
Flags
| Bits | Value | Meaning |
|---|---|---|
| 0 – 2 | GCOL action | |
| 3 | 0 | Do not use transparency |
| 1 | Use transparency | |
| 4 | 0 | Alter foreground colour |
| 1 | Alter background colour | |
| 5 | 0 | R1 is colour number |
| 1 | R1 is pointer to ECF pattern | |
| 6 | 0 | Set graphics colour |
| 1 | Set text colour1 | |
| 7 | 0 | Write colour |
| 1 | Read colour 1 | |
| 6 – 31 | Reserved, must be zero |
Notes
If bit 3 is set, then any pixels within the generated ECF block which would normally use the background colour will instead be made transparent.
1 Introduced in RISC OS 3.5
See also
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