code: public boolean setCharAdvance(int c, int advance) {
          int[] m = getMetricsTT(c);
          if (m == null)
              return false;
          m[1] = advance;
          return true;
      }
docs: Sets the character advance.
  @param c the character
  @param advance the character advance normalized to 1000 units
  @return <CODE>true</CODE> if the advance was set,
  <CODE>false</CODE> otherwise