=> R1 = background logical colour
R2 = foreground logical colour
R3 = foreground colour offset
R4 = background physical colour
R5 = foreground physical colour
R6 = &65757254 ('True') to use 24 bit colours in R4,R5
This SWI is used to set the anti-alias palette. You should not use this if you're running in the desktop. Instead you should use Wimp_SetFontColours or ColourTrans_SetFontColours.
On RISC OS 3 and later, if R6 != 'True' then R4,R5 have their top nibbles copied to their bottom nibbles, so &12345678 becomes &11335500.
See PRM 3, page 455.
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