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Routines |
| Prev: A678 | Up: Map | Next: A6E1 |
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Erases one row of a sprite that is aligned to a byte from the buffer used by DrawSprites. The entry point depends on the width of the sprite in bytes, from six bytes at EraseAlignedRowInBuffer to one byte at A6D0.
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| EraseAlignedRowInBuffer | A6B2 | LD A,(DE) | Fetch a byte of the sprite. | |||||||
| A6B3 | CPL | Invert it. | ||||||||
| A6B4 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| A6B5 | LD (HL),A | Store the byte. | ||||||||
| A6B6 | INC DE | Move on to the next byte of the sprite. | ||||||||
| A6B7 | INC L | Move on to the next byte of the buffer. | ||||||||
| A6B8 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| A6B9 | CPL | Invert it. | ||||||||
| A6BA | AND (HL) | Clear the pixels of the buffer. | ||||||||
| A6BB | LD (HL),A | Store the byte. | ||||||||
| A6BC | INC DE | Move on to the next byte of the sprite. | ||||||||
| A6BD | INC L | Move on to the next byte of the buffer. | ||||||||
| A6BE | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| A6BF | CPL | Invert it. | ||||||||
| A6C0 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| A6C1 | LD (HL),A | Store the byte. | ||||||||
| A6C2 | INC DE | Move on to the next byte of the sprite. | ||||||||
| A6C3 | INC L | Move on to the next byte of the buffer. | ||||||||
| A6C4 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| A6C5 | CPL | Invert it. | ||||||||
| A6C6 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| A6C7 | LD (HL),A | Store the byte. | ||||||||
| A6C8 | INC DE | Move on to the next byte of the sprite. | ||||||||
| A6C9 | INC L | Move on to the next byte of the buffer. | ||||||||
| A6CA | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| A6CB | CPL | Invert it. | ||||||||
| A6CC | AND (HL) | Clear the pixels of the buffer. | ||||||||
| A6CD | LD (HL),A | Store the byte. | ||||||||
| A6CE | INC DE | Move on to the next byte of the sprite. | ||||||||
| A6CF | INC L | Move on to the next byte of the buffer. | ||||||||
| A6D0 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| A6D1 | CPL | Invert it. | ||||||||
| A6D2 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| A6D3 | LD (HL),A | Store the byte. | ||||||||
| A6D4 | INC DE | Move on to the next byte of the sprite. | ||||||||
| A6D5 | LD A,$00 | Fetch the amount to skip, which was set at A45D. | ||||||||
| A6D7 | ADD A,L | Add it to the address in the buffer. | ||||||||
| A6D8 | LD L,A | Store it in L. | ||||||||
| A6D9 | EX AF,AF' | Switch to the count of rows. | ||||||||
| A6DA | DEC A | Take one off. | ||||||||
| A6DB | JP Z,DrawSprites_Draw | Jump to DrawSprites_Draw to draw the second sprite when there are none left. | ||||||||
| A6DE | EX AF,AF' | Switch back. | ||||||||
| A6DF | JP (IY) | Erase the next row. | ||||||||
| Prev: A678 | Up: Map | Next: A6E1 |