=> R0 = font handle
R1 = character
R2 = flags (only bit 4 matters)
<= R1 = min x incl
R2 = min y incl
R3 = max x excl
R4 = max y excl
This SWI returns the bounding box for the given character of the given font. The bounding box is the smallest box necessary to cover the character.
With the UCS Font Manager the character in R1 is any of 0-&7FFFFFFF Unicode values inclusive, otherwise only 0-255.
See PRM 3, page 446.
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