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Routines |
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Tests a row against the view, using the position in the alternate registers. A row on the drawable page, with its column below 193 is drawn by TestBlockRow_Draw when it is before the patched row, or by DrawShortRow when it is on that row. A row past it is left undrawn.
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| TestBlockRow | 50967 | PUSH HL | Take the position from the alternate registers. | |||||||
| 50968 | PUSH DE | |||||||||
| 50969 | EXX | |||||||||
| 50970 | POP DE | |||||||||
| 50971 | POP HL | |||||||||
| 50972 | LD A,H | Return unless the row is on the drawable page. | ||||||||
| 50973 | CP 128 | |||||||||
| 50975 | RET NZ | |||||||||
| 50976 | LD A,L | Return when the column is past 192. | ||||||||
| 50977 | CP 193 | |||||||||
| 50979 | RET NC | |||||||||
| 50980 | LD A,D | Return unless the other address is on the same page. | ||||||||
| 50981 | CP 128 | |||||||||
| 50983 | RET NZ | |||||||||
| 50984 | LD A,E | A row on the patched position is the short row. | ||||||||
| 50985 | SUB 0 | |||||||||
| 50987 | JR Z,DrawShortRow | |||||||||
| 50989 | RET NC | A row past that position is left undrawn. | ||||||||
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Continue on to TestBlockRow_Draw.
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