Jeff Sharkey | 5b78a3a | 2013-02-19 17:28:10 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Some utility functions on VTermRect structures |
| 3 | */ |
| 4 | |
| 5 | #define STRFrect "(%d,%d-%d,%d)" |
| 6 | #define ARGSrect(r) (r).start_row, (r).start_col, (r).end_row, (r).end_col |
| 7 | |
| 8 | /* Expand dst to contain src as well */ |
| 9 | static void rect_expand(VTermRect *dst, VTermRect *src) |
| 10 | { |
| 11 | if(dst->start_row > src->start_row) dst->start_row = src->start_row; |
| 12 | if(dst->start_col > src->start_col) dst->start_col = src->start_col; |
| 13 | if(dst->end_row < src->end_row) dst->end_row = src->end_row; |
| 14 | if(dst->end_col < src->end_col) dst->end_col = src->end_col; |
| 15 | } |
| 16 | |
| 17 | /* Clip the dst to ensure it does not step outside of bounds */ |
| 18 | static void rect_clip(VTermRect *dst, VTermRect *bounds) |
| 19 | { |
| 20 | if(dst->start_row < bounds->start_row) dst->start_row = bounds->start_row; |
| 21 | if(dst->start_col < bounds->start_col) dst->start_col = bounds->start_col; |
| 22 | if(dst->end_row > bounds->end_row) dst->end_row = bounds->end_row; |
| 23 | if(dst->end_col > bounds->end_col) dst->end_col = bounds->end_col; |
| 24 | /* Ensure it doesn't end up negatively-sized */ |
| 25 | if(dst->end_row < dst->start_row) dst->end_row = dst->start_row; |
| 26 | if(dst->end_col < dst->start_col) dst->end_col = dst->start_col; |
| 27 | } |
| 28 | |
| 29 | /* True if the two rectangles are equal */ |
| 30 | static int rect_equal(VTermRect *a, VTermRect *b) |
| 31 | { |
| 32 | return (a->start_row == b->start_row) && |
| 33 | (a->start_col == b->start_col) && |
| 34 | (a->end_row == b->end_row) && |
| 35 | (a->end_col == b->end_col); |
| 36 | } |
| 37 | |
| 38 | /* True if small is contained entirely within big */ |
| 39 | static int rect_contains(VTermRect *big, VTermRect *small) |
| 40 | { |
| 41 | if(small->start_row < big->start_row) return 0; |
| 42 | if(small->start_col < big->start_col) return 0; |
| 43 | if(small->end_row > big->end_row) return 0; |
| 44 | if(small->end_col > big->end_col) return 0; |
| 45 | return 1; |
| 46 | } |
| 47 | |
| 48 | /* True if the rectangles overlap at all */ |
| 49 | static int rect_intersects(VTermRect *a, VTermRect *b) |
| 50 | { |
| 51 | if(a->start_row > b->end_row || b->start_row > a->end_row) |
| 52 | return 0; |
| 53 | if(a->start_col > b->end_col || b->start_col > a->end_col) |
| 54 | return 0; |
| 55 | return 1; |
| 56 | } |