Gunfright: Routine at BFA3

Draws the columns of a sprite which is flipped but not shifted. There is a piece of code for each of up to five columns, and the code for the width of the sprite is where the jump at SpriteJumpOpcode starts. Each piece takes the mask and the pixels for one byte from the sprite data on the stack, turns them round with the table, wipes the screen where the mask is and puts the pixels in. It works from right to left.

Draws the columns of a sprite which is flipped but not shifted. There is a piece of code for each of up to five columns, and the code for the width of the sprite is where the jump at SpriteJumpOpcode starts. Each piece takes the mask and the pixels for one byte from the sprite data on the stack, turns them round with the table, wipes the screen where the mask is and puts the pixels in. It works from right to left.
The jump at SpriteJumpOpcode starts here for five columns.
DrawFlippedAlignedColumns	BFA3	POP DE	Restore the mask into E and the pixels into D from the stack.
	BFA4	LD L,E	Turn the mask round and clear the screen bits under it.
	BFA5	CPL
	BFA6	OR (HL)
	BFA7	CPL
	BFA8	LD L,D	Turn the pixels round and add them.
	BFA9	OR (HL)	Turn the pixels round and add them.
	BFAA	LD (BC),A	Store the byte, move to the byte on the left and fetch it.
	BFAB	DEC BC
	BFAC	LD A,(BC)
The jump at SpriteJumpOpcode starts here for four columns.
	BFAD	POP DE	Restore the mask into E and the pixels into D from the stack.
	BFAE	LD L,E	Turn the mask round and clear the screen bits under it.
	BFAF	CPL
	BFB0	OR (HL)
	BFB1	CPL
	BFB2	LD L,D	Turn the pixels round and add them.
	BFB3	OR (HL)	Turn the pixels round and add them.
	BFB4	LD (BC),A	Store the byte, move to the byte on the left and fetch it.
	BFB5	DEC BC
	BFB6	LD A,(BC)
The jump at SpriteJumpOpcode starts here for three columns.
	BFB7	POP DE	Restore the mask into E and the pixels into D from the stack.
	BFB8	LD L,E	Turn the mask round and clear the screen bits under it.
	BFB9	CPL
	BFBA	OR (HL)
	BFBB	CPL
	BFBC	LD L,D	Turn the pixels round and add them.
	BFBD	OR (HL)	Turn the pixels round and add them.
	BFBE	LD (BC),A	Store the byte, move to the byte on the left and fetch it.
	BFBF	DEC BC
	BFC0	LD A,(BC)
The jump at SpriteJumpOpcode starts here for two columns.
	BFC1	POP DE	Restore the mask into E and the pixels into D from the stack.
	BFC2	LD L,E	Turn the mask round and clear the screen bits under it.
	BFC3	CPL
	BFC4	OR (HL)
	BFC5	CPL
	BFC6	LD L,D	Turn the pixels round and add them.
	BFC7	OR (HL)	Turn the pixels round and add them.
	BFC8	LD (BC),A	Store the byte, move to the byte on the left and fetch it.
	BFC9	DEC BC
	BFCA	LD A,(BC)
The jump at SpriteJumpOpcode starts here for one column.
	BFCB	POP DE	Restore the mask into E and the pixels into D from the stack.
	BFCC	LD L,E	Turn the mask round and clear the screen bits under it.
	BFCD	CPL
	BFCE	OR (HL)
	BFCF	CPL
	BFD0	LD L,D	Turn the pixels round and add them.
	BFD1	OR (HL)	Turn the pixels round and add them.
	BFD2	LD (BC),A	Store the byte.
Finish the row.
	BFD3	JP FinishSpriteRow	Jump to FinishSpriteRow.