abstractcompute

/* SOURCE
http://download.oracle.com/javase/tutorial/essential/concurrency/forkjoin.html
*/

protected static int sThreshold = 100000;

  protected void compute() {
    if (mLength < sThreshold) {
      computeDirectly();
      return;
    }

    int split = mLength / 2;

    invokeAll(new ForkBlur(mSource, mStart,         split,           mDestination),
              new ForkBlur(mSource, mStart + split, mLength - split, mDestination));
  }