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| 1 | /* |
| 2 | * overlap.h - Test for overlaps |
| 3 | * |
| 4 | * Written 2009, 2010 by Werner Almesberger |
| 5 | * Copyright 2009, 2010 by Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #ifndef OVERLAP_H |
| 14 | #define OVERLAP_H |
| 15 | |
| 16 | |
| 17 | enum allow_overlap { |
| 18 | ao_none, |
| 19 | ao_touch, |
| 20 | ao_any, |
| 21 | }; |
| 22 | |
| 23 | |
| 24 | /* |
| 25 | * Avoid inst.h -> layer.h -> overlay.h -> inst.h loop |
| 26 | */ |
| 27 | |
| 28 | struct inst; |
| 29 | |
| 30 | |
| 31 | /* |
| 32 | * "inside" returns 1 if "a" is completely enclosed by "b". If "a" == "b", |
| 33 | * that also counts as "a" being inside "b". |
| 34 | */ |
| 35 | |
| 36 | int inside(const struct inst *a, const struct inst *b); |
| 37 | |
| 38 | /* |
| 39 | * "overlap" returns 1 if "a" and "b" have at least one point in common. |
| 40 | */ |
| 41 | |
| 42 | int overlap(const struct inst *a, const struct inst *b, |
| 43 | enum allow_overlap allow); |
| 44 | |
| 45 | #endif /* !OVERLAP_H */ |
| 46 |
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