modules/graphics/src/main/java/javafx/scene/effect/Effect.java

*** 269,279 ****
          ret = tx.transform(r, ret);
          return ret;
      }
  
      // utility method used in calculation of bounds in BoxBlur and DropShadow effects
!     static int getKernelSize(int ksize, int iterations) {
          if (ksize < 1) ksize = 1;
          ksize = (ksize-1) * iterations + 1;
          ksize |= 1;
          return ksize / 2;
      }
--- 269,280 ----
          ret = tx.transform(r, ret);
          return ret;
      }
  
      // utility method used in calculation of bounds in BoxBlur and DropShadow effects
!     static int getKernelSize(float fsize, int iterations) {
!         int ksize = (int) Math.ceil(fsize);
          if (ksize < 1) ksize = 1;
          ksize = (ksize-1) * iterations + 1;
          ksize |= 1;
          return ksize / 2;
      }