=> R0 = font handle
R1 = pointer to buffer for font name, or 0 and R3 = 'FULL' to read size
R3 = 'FULL' (&4C4C5546) to read matrix and encoding as well
<= R2 = x points * 16
R3 = y points * 16
R4 = x dpi
R5 = y dpi
R6 = age of font (number of font calls since this one was last accessed)
R7 = usage count
or
R2 = size of buffer required
R3-R7 corrupt
This SWI returns information about the given font. If R3 is 'FULL' on entry, this returns a font identifier instead of just the name.
See PRM 3, page 424.
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