ce, the value&nbsp;0 is returned.  By convention,
      it always correspond to a special glyph image called the <em>missing
      glyph</em>, which is commonly displayed as a box or a space.</p>

      <h4>
        b.&nbsp;Loading a glyph from the face
      </h4>

      <p>Once you have a glyph index, you can load the corresponding glyph
      image.  The latter can be stored in various formats within the font
      file.  For fixed-size formats like FNT or PCF, each image is a bitmap.
      Scalable form