static BitMatrix randomBitMatrix(int w, int h) {
  int[] data = arrayOfRandomInts(IntArrayBitMatrix.arrayLength(w, h));
  ret new IntArrayBitMatrix(w, h, data);
}

static BitMatrix randomBitMatrix(int w, int h, double probability) {
  int[] data = arrayOfRandomBitsAsInts(IntArrayBitMatrix.arrayLength(w, h), probability);
  ret new IntArrayBitMatrix(w, h, data);
}