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Routines |
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Used by the routines at FLOOD_FILL and DRAW_LINE.
x is a whole byte, so the only edge is the wrap to zero.
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| INC_X | 8141 | INC D | Right one; fine unless it wrapped to 0 | |
| 8142 | RET NZ | |||
| 8143 | DEC D | Wrapped: undo it, bit 0 of A clear | ||
| 8144 | LD H,A | |||
| 8145 | XOR A | |||
| 8146 | LD A,H | |||
| 8147 | RET | |||
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