Unused
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48949: Unused: Draw 3-Wide Sprite With Attributes
Unused alternative routine to draw a 3-wide sprite and apply its attributes in a single pass.
Unused_Draw_3Wide 48949 PUSH DE Copy DE to IX.
48950 POP IX
48952 LD L,(IX+0) Load the screen address low byte from *IX+0.
48955 INC IX Advance IX.
48957 LD H,(IX+0) Load the screen address high byte from *IX+0.
48960 PUSH HL Stash the screen address on the stack.
48961 INC IX Advance IX.
48963 LD A,(IX+0) Load the width flag from *IX+0.
48966 INC IX Advance IX.
48968 PUSH IX Copy IX to DE.
48970 POP DE Advance DE past the data header.
48971 INC DE
48972 LD C,7 Set the row boundary mask to 7 in C.
48974 OR A Jump to Unused_Draw_3Wide_1Col if the width flag is zero (one column wide).
48975 JR Z,49007
Draw two columns per row.
48977 LD B,8 Set the row counter to 8 in B.
Unused_Draw_3Wide_Row_Loop 48979 LD A,(DE) OR the sprite data byte from *DE onto the first screen column at *HL.
48980 OR (HL)
48981 LD (HL),A
48982 INC L Advance to the next column and OR the next byte onto the second column.
48983 INC DE
48984 LD A,(DE)
48985 OR (HL)
48986 LD (HL),A
48987 DEC L Move back to the first column and advance the sprite data pointer.
48988 INC DE
48989 INC H Move down one pixel row in the screen buffer.
48990 LD A,H Check if the pixel row has crossed a character boundary.
48991 AND C
48992 CALL Z,48517 Call 48487 to adjust the screen address if needed.
48995 DJNZ 48979 Decrease the row counter and loop back to Unused_Draw_3Wide_Row_Loop until all 8 rows are drawn.
Apply attributes for the 3-wide sprite (two columns).
48997 LD D,1 Set D to 1 (flag: two columns wide).
48999 POP HL Restore the screen address from the stack.
49000 LD E,(IX+0) Load the sprite X position from *IX+0 into E.
49003 CALL 49031 Call Unused_Apply_3Wide_Attributes to apply the sprite attributes.
49006 RET Return.
Draw one column per row.
Unused_Draw_3Wide_1Col 49007 LD B,8 Set the row counter to 8 in B.
Unused_Draw_3Wide_1Col_Loop 49009 LD A,(DE) OR the sprite data byte from *DE onto the screen at *HL.
49010 OR (HL)
49011 LD (HL),A
49012 INC H Move down one pixel row in the screen buffer.
49013 LD A,H Check if the pixel row has crossed a character boundary.
49014 AND C
49015 CALL Z,48517 Call 48487 to adjust the screen address if needed.
49018 INC DE Advance the sprite data pointer.
49019 DJNZ 49009 Decrease the row counter and loop back to Unused_Draw_3Wide_1Col_Loop until all 8 rows are drawn.
Apply attributes for the 3-wide sprite (one column).
49021 POP HL Restore the screen address from the stack.
49022 LD E,(IX+0) Load the sprite X position from *IX+0 into E.
49025 LD D,0 Set D to 0 (flag: one column wide).
49027 CALL 49031 Call Unused_Apply_3Wide_Attributes to apply the sprite attributes.
49030 RET Return.
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