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      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 }
     57