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Routines |
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Used by the routine at DrawWallStrip.
Skips the rows of a wall tile that are below PlayfieldBuffer. A is the number of those rows, negated. It starts drawing at 72 and jumps to DrawWallStrip_Rows.
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Skip the rows that are below the buffer.
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| ClipWallStripTop | 50665 | NEG | Make the number of rows positive and keep it in C. | |||||||
| 50667 | LD C,A | |||||||||
| 50668 | LD A,(HL) | Fetch the height of the image. | ||||||||
| 50669 | INC HL | |||||||||
| 50670 | SUB C | Subtract the rows that are below. | ||||||||
| 50671 | RET M | Return if there are none left. | ||||||||
| 50672 | RET Z | |||||||||
| 50673 | LD B,0 | Skip the image data for those rows. | ||||||||
| 50675 | ADD HL,BC | |||||||||
| 50676 | ADD HL,BC | |||||||||
| 50677 | LD D,72 | Set the vertical position to 72. | ||||||||
| 50679 | JR DrawWallStrip_Rows | Jump to DrawWallStrip_Rows. | ||||||||
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View the equivalent code in;
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