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Routines |
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Used by the routine at DrawWallStrip.
Skips the rows of a wall strip that are below PixelBuffer. A is the number of those rows, negated. It starts drawing at 48 and jumps to DrawWallStrip_Draw.
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Skip the rows that are below the buffer.
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| ClipWallStripTop | D415 | NEG | Make the number of rows positive and keep it in C. | |||||||
| D417 | LD C,A | |||||||||
| D418 | LD A,(HL) | Fetch the height of the graphic. | ||||||||
| D419 | INC HL | |||||||||
| D41A | SUB C | Subtract the rows that are below. | ||||||||
| D41B | RET M | Return if there are none left. | ||||||||
| D41C | RET Z | |||||||||
| D41D | LD B,$00 | Skip the image data for those rows. | ||||||||
| D41F | ADD HL,BC | |||||||||
| D420 | ADD HL,BC | |||||||||
| D421 | LD D,$48 | Set the vertical position to 48. | ||||||||
| D423 | JR DrawWallStrip_Draw | Jump to DrawWallStrip_Draw. | ||||||||
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View the equivalent code in;
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| Prev: D3C2 | Up: Map | Next: D425 |