=> R0 = X coord
R1 = Y coord
<= R2 = Colour
R3 = Tint
R4 = -1 if point was off screen, 0 otherwise
This SWI returns the colour and tint of a point. 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.
See PRM 1, page 707.
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