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Routines |
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Used by the routines at wipe_height and wipe_rect.
Bytes $18 and $19 of a record are the width in bytes and height in rows of its sprite as last drawn, and $1A and $1B its pixel x and y; save_2d_info copies all four to bytes $1C to $1F before the object's handler runs, so they hold last frame's picture while $18 to $1B are about to get this frame's. The rectangle wiped is the smallest one that covers both.
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| wipe_next_object | D5B2 | LD HL,($5BCB) | the next index from the list | |
| D5B5 | LD A,(HL) | |||
| D5B6 | INC HL | |||
| D5B7 | LD ($5BCB),HL | |||
| D5BA | CP $FF | $FF ends it | ||
| D5BC | JP Z,draw_and_copy_rects | |||
| D5BF | CALL get_ptr_object | bit 5 of byte 7 means it needs wiping; the others in the list are only being drawn again | ||
| D5C2 | PUSH HL | |||
| D5C3 | POP IX | |||
| D5C5 | BIT 5,(IX+$07) | |||
| D5C9 | JR Z,wipe_next_object | |||
| D5CB | RES 5,(IX+$07) | only once | ||
| D5CF | LD A,(IX+$1A) | C = whichever of the new (byte $1A) and old (byte $1E) pixel x is further left | ||
| D5D2 | SUB (IX+$1E) | |||
| D5D5 | JP C,wipe_left_is_new | |||
| D5D8 | LD C,(IX+$1E) | |||
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