Tranz Am: Routine at 29040

29040: Mask Sprite

Used by the routines at ActorEraseMovedSprite, ActorEraseDestroyed, 29001, DrawTwoBytes and 29131.
MaskSprite	29040	LD A,C	Jump to 29131 if the vertical position is zero.
	29041	AND A
	29042	JR Z,29131
	29044	DEC C	Decrease C by one.
	29045	PUSH HL	Stash HL on the stack.
	29046	LD A,(24128)	B=24128.
	29049	LD B,A	B=24128.
	29050	EX DE,HL
	29051	PUSH DE
	29052	LD D,(HL)
	29053	INC HL
	29054	LD E,(HL)
	29055	INC HL
	29056	AND A
	29057	JR Z,29037
	29059	EX DE,HL
	29060	XOR A
MaskSprite_0	29061	ADD HL,HL
	29062	ADC A,A
	29063	DJNZ MaskSprite_0
	29065	EX DE,HL
	29066	EX (SP),HL
	29067	CPL
	29068	AND (HL)
	29069	LD (HL),A
	29070	INC L
This entry point is used by the routine at 29037.
MaskSprite_1	29071	LD A,D
	29072	CPL
	29073	AND (HL)
	29074	LD (HL),A
	29075	INC L
	29076	LD A,E
	29077	CPL
	29078	AND (HL)
	29079	LD (HL),A
	29080	POP DE
	29081	POP HL
	29082	CALL ScreenPos1PixelAbove	Call ScreenPos1PixelAbove.
	29085	EXX
	29086	LD A,C
	29087	AND A
	29088	JR Z,DrawTwoBytes_0
This entry point is used by the routine at 29131.
MaskSprite_2	29090	DEC C
	29091	PUSH HL
	29092	LD A,(24129)	B=24129.
	29095	LD B,A	B=24129.
	29096	EX DE,HL
	29097	PUSH DE	Stash DE on the stack.
	29098	LD D,(HL)
	29099	INC HL
	29100	LD E,(HL)
	29101	INC HL
	29102	AND A
	29103	JR Z,29162
	29105	EX DE,HL
	29106	XOR A
MaskSprite_3	29107	ADD HL,HL
	29108	ADC A,A
	29109	DJNZ MaskSprite_3
	29111	EX DE,HL
	29112	EX (SP),HL
	29113	OR (HL)
	29114	LD (HL),A
	29115	INC L