kits/interface/RegionSupport.cpp

296      Quantifier is Exists if grow is true, For all if grow is false, and
299    Thus, if xdir is true and grow is false, r is replaced by the region
313 #define ZOpRegion(a,b,c) if (grow) BRegion::Support::XUnionRegion(a,b,c); \
323     register int xdir, register int grow)
353     int grow;
357     if ((grow = (dx < 0))) dx = -dx;
358     if (dx) Compress(r, s, t, (unsigned) 2*dx, true, grow);
359     if ((grow = (dy < 0))) dy = -dy;
360     if (dy) Compress(r, s, t, (unsigned) 2*dy, false, grow);