=> R1 = pointer to string
R2 = max width in millipoints
R3 = max height in millipoints
R4 = split character, or -1 for none
R5 = max string length
<= R1 = pointer to where scan ended.
R2 = width of scanned string.
R3 = height of scanned string.
R4 = number of split chars found
R5 = length of scanned string.
This SWI calculates how wide a string would be under the given limits. After this SWI, you can call Font_FutureFont to find out what the current font would be after a call to Font_Paint with this string.
See PRM 3, page 427.
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