=> R1 = pointer to string
<= R1 = min x, inclusive
R2 = min y, inclusive
R3 = max x, exclusive
R4 = max y, exclusive
This SWI returns the smallest possible box that covers the whole string. The box is returned in millipoints. This call cannot, due to rounding and anti-aliasing, be used to find size on screen.
In RISC OS 3 and later it is recommended to use Font_ScanString.
See PRM 3, page 463.
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