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Routines |
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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 42704.
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| EraseAlignedRowInBuffer | 42674 | LD A,(DE) | Fetch a byte of the sprite. | |||||||
| 42675 | CPL | Invert it. | ||||||||
| 42676 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| 42677 | LD (HL),A | Store the byte. | ||||||||
| 42678 | INC DE | Move on to the next byte of the sprite. | ||||||||
| 42679 | INC L | Move on to the next byte of the buffer. | ||||||||
| 42680 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| 42681 | CPL | Invert it. | ||||||||
| 42682 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| 42683 | LD (HL),A | Store the byte. | ||||||||
| 42684 | INC DE | Move on to the next byte of the sprite. | ||||||||
| 42685 | INC L | Move on to the next byte of the buffer. | ||||||||
| 42686 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| 42687 | CPL | Invert it. | ||||||||
| 42688 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| 42689 | LD (HL),A | Store the byte. | ||||||||
| 42690 | INC DE | Move on to the next byte of the sprite. | ||||||||
| 42691 | INC L | Move on to the next byte of the buffer. | ||||||||
| 42692 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| 42693 | CPL | Invert it. | ||||||||
| 42694 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| 42695 | LD (HL),A | Store the byte. | ||||||||
| 42696 | INC DE | Move on to the next byte of the sprite. | ||||||||
| 42697 | INC L | Move on to the next byte of the buffer. | ||||||||
| 42698 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| 42699 | CPL | Invert it. | ||||||||
| 42700 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| 42701 | LD (HL),A | Store the byte. | ||||||||
| 42702 | INC DE | Move on to the next byte of the sprite. | ||||||||
| 42703 | INC L | Move on to the next byte of the buffer. | ||||||||
| 42704 | LD A,(DE) | Fetch a byte of the sprite. | ||||||||
| 42705 | CPL | Invert it. | ||||||||
| 42706 | AND (HL) | Clear the pixels of the buffer. | ||||||||
| 42707 | LD (HL),A | Store the byte. | ||||||||
| 42708 | INC DE | Move on to the next byte of the sprite. | ||||||||
| 42709 | LD A,0 | Fetch the amount to skip, which was set at 42077. | ||||||||
| 42711 | ADD A,L | Add it to the address in the buffer. | ||||||||
| 42712 | LD L,A | Store it in L. | ||||||||
| 42713 | EX AF,AF' | Switch to the count of rows. | ||||||||
| 42714 | DEC A | Take one off. | ||||||||
| 42715 | JP Z,DrawSprites_Draw | Jump to DrawSprites_Draw to draw the second sprite when there are none left. | ||||||||
| 42718 | EX AF,AF' | Switch back. | ||||||||
| 42719 | JP (IY) | Erase the next row. | ||||||||
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