Routines
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B5E6: Calculate space for a graphic
Used by the routine at B4A5.
Input
BC Height in lines
DE Width in UDGs
HL On return, holds the required space
B5E6 LD A,$10 Amount to increment for each unit
B5E8 LD HL,$0000 Default offset
B5EB ADD HL,HL Shift left
B5EC SLA C Is there any more to check?
B5EE RL B
B5F0 JR NC,$B5F6 No, so move on
B5F2 ADD HL,DE Add more width
B5F3 JR NC,$B5F6 Skip next bit if no more width to add
B5F5 INC BC Add next line
B5F6 DEC A Loop back if more to do
B5F7 JR NZ,$B5EB
B5F9 RET
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