function TTFSubset(font) {
    var _this12;

    _this12 = _Subset.call(this, font) || this;
    _this12.glyphEncoder = new TTFGlyphEncoder();
    return _this12;
  }
Returns an array of Glyph objects for the given string.
This is only a one-to-one mapping from characters to glyphs.
For most uses, you should use font.layout (described below), which
provides a much more advanced mapping supporting AAT and OpenType shaping.

@param {string} string
@return {Glyph[]}