Fix hang while rendering text on degenerate polygons (#4908)

center-of-gravity calculation was returning NaNs which in turn caused agg's rasterizer to hang
MapServer · Nov 22, 2015 · 3dfc920 · 3dfc920
1 parent ab2a612
commit 3dfc920
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/mapprimitive.c b/mapprimitive.c
@@ -1251,6 +1251,8 @@ static int getPolygonCenterOfGravity(shapeObj *p, pointObj *lp)
       sy = s>0?tsy:-tsy;
     }
   }
+  if(largestArea == 0) /*degenerate polygon*/
+    return MS_FAILURE;
 
   lp->x = sx/(6*largestArea);
   lp->y = sy/(6*largestArea);