code: function parseGlyphCoordinate(p, flag, previousValue, shortVectorBitMask, sameBitMask) {
      var v;
      if ((flag & shortVectorBitMask) > 0) {
          // The coordinate is 1 byte long.
          v = p.parseByte();
          // The `same` bit is re-used for short values to signify the sign of the value.
          if ((flag & sameBitMask) === 0) {
              v = -v;
          }
          v = previousValue + v;
      } else {
          //  The coordinate is 2 bytes long.
          // If the `same` bit is set, the coordinate is the same as the previous coordinate.
          if ((flag & sameBitMask) > 0) {
              v = previousValue;
          } else {
              // Parse the coordinate as a signed 16-bit delta value.
              v = previousValue + p.parseShort();
          }
      }
      return v;
  }
docs: Parse the coordinate data for a glyph.