=> R0 = font handle or 0 to read from r_caddr
R1 = redraw block (r_caddr, r_linesp, r_magx, r_magy)
R2 = flags
<= R0 corrupted
R1 preserved
R2,R3 = x,y size
This SWI reads the size of a font.
ReadCharSize flags
bit meaning
0 Return values in OS units (else pixels)
1 Use value of r_linesp
2 Use r_flags bits 1 and 5 (if r_flags bit 0 clear)
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