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Routines |
| Prev: F490 | Up: Map | Next: F514 |
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Used by the routine at DrawingFill.
Reads the screen byte under the pen and keeps only the bits already set there.
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| KeepOnlyBitsThatAreSet | F50D | PUSH HL | Call PixelAddress to work out the pixel address. | |
| F50E | CALL PixelAddress | |||
| F511 | AND (HL) | Keep only the screen bits already set under the pen. | ||
| F512 | POP HL | Restore the saved pointer from the stack. | ||
| F513 | RET | Return. | ||
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View the equivalent code in;
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| Prev: F490 | Up: Map | Next: F514 |