A fast and easily customised operating system
for ARM devices
OS_ReadPoint
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_ReadPoint
OS_ReadPoint
(SWI &32)
| Entry | |
|---|---|
| R0 | X co-ordinate |
| R1 | Y co-ordinate |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Preserved |
| R2 | Colour |
| R3 | Tint |
| R4 | -1 if point was off screen, else 0 |
Use
The purpose of this call is to return the colour and tint of a point.
Notes
If in a 16 or 32 bpp mode, this will return the 15 or 24 bit colour number in R2 and tint will be 0.