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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 48 and jumps to DrawWallStrip_Rows.
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Skip the rows that are below the buffer.
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| ClipWallStripTop | C5E9 | NEG | Make the number of rows positive and keep it in C. | |||||||
| C5EB | LD C,A | |||||||||
| C5EC | LD A,(HL) | Fetch the height of the image. | ||||||||
| C5ED | INC HL | |||||||||
| C5EE | SUB C | Subtract the rows that are below. | ||||||||
| C5EF | RET M | Return if there are none left. | ||||||||
| C5F0 | RET Z | |||||||||
| C5F1 | LD B,$00 | Skip the image data for those rows. | ||||||||
| C5F3 | ADD HL,BC | |||||||||
| C5F4 | ADD HL,BC | |||||||||
| C5F5 | LD D,$48 | Set the vertical position to 48. | ||||||||
| C5F7 | JR DrawWallStrip_Rows | Jump to DrawWallStrip_Rows. | ||||||||
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View the equivalent code in;
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