Routines
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D6BD: Draw Tile Both
Used by the routine at DrawTilePixels.
Draws a tile reflected both horizontally and vertically.
Input
DE The address of the tile
HL The screen address
Start at the last line.
DrawTileBoth D6BD LD B,$08 Set the number of lines.
D6BF INC DE Move to the last line.
D6C0 INC DE
D6C1 INC DE
D6C2 INC DE
D6C3 INC DE
D6C4 INC DE
D6C5 INC DE
Draw each line turned round, from last to first.
DrawTileBoth_Line D6C6 LD A,(DE) Fetch a line, move to the previous one and keep the line in C.
D6C7 DEC DE
D6C8 LD C,A
D6C9 PUSH BC Save the counters.
D6CA LD B,$F9 Point BC at the page of bytes turned round.
D6CC LD A,(BC) Draw the line turned round.
D6CD LD (HL),A
D6CE INC H
D6CF POP BC Restore the counters.
D6D0 DJNZ DrawTileBoth_Line Go back for the next line.
D6D2 RET Return.
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