Routines
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C789: The second pillar of an arch (graphics 7 and 9)
A doorway is two pillars, and this one only sets its drawing offset: the first pillar (FIRST_PILLAR) does the work. An arch in a wall of constant V is mirrored (bit 6 of its flags); one in a wall of constant U is not.
Input
IX The pillar's record
SECOND_PILLAR C789 BIT 6,(IX+$07) Mirrored
C78D JR NZ,SECOND_PILLAR_0
C78F LD A,(IX+$00) Graphic 9 has an offset of its own
C792 CP $09
C794 JR Z,SECOND_PILLAR_1
C796 LD HL,$FBF9 Graphic 7, not mirrored: X -7, Y -5
C799 JP SET_PIXEL_ADJ
SECOND_PILLAR_0 C79C LD HL,$FCF9 Mirrored: X -7, Y -4
C79F JP SET_PIXEL_ADJ
SECOND_PILLAR_1 C7A2 LD HL,$FBF0 Graphic 9, not mirrored: X -16, Y -5
C7A5 JP SET_PIXEL_ADJ
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