Blizzard Pass: Routine at 73F1

73F1: Address Pixel Row

Used by the routines at ShapeIfPresent, DrawFixedShift, HorizontalRun and VerticalRun. Turns a pixel row in B into a display address via the character-row table.
PixelRow	73F1	LD A,B
	73F2	CALL RowWord
	73F5	PUSH DE
	73F6	POP HL
	73F7	LD B,$00
	73F9	ADD HL,BC
	73FA	RET
PixelRow_0	73FB	PUSH BC
	73FC	PUSH HL
	73FD	LD BC,$0000
	7400	ADD HL,BC
	7401	LD B,C
	7402	DEC HL
	7403	PUSH HL
	7404	POP DE
PixelRow_1	7405	RL (HL)
	7407	DEC HL
	7408	DJNZ PixelRow_1
	740A	EX DE,HL
	740B	RES 0,(HL)
	740D	JR NC,PixelRow_2
	740F	SET 0,(HL)
PixelRow_2	7411	POP HL
	7412	POP BC
	7413	INC H
	7414	DJNZ PixelRow_0
	7416	RET
This entry point is used by the routine at HorizontalRun.
PixelRow_3	7417	PUSH BC
	7418	CALL PixelRow
	741B	LD B,$08
	741D	CALL PixelRow_0
	7420	POP BC
	7421	INC B
	7422	LD A,B
	7423	CP $00
	7425	JR NZ,PixelRow_3
	7427	RET