=top>
        <tt>rows</tt>
      </td>
      <td valign=top>
        the number of rows, i.e. lines, in the bitmap
      </td>
    </tr>

    <tr>
      <td valign=top>
        <tt>width</tt>
      </td>
      <td valign=top>
        the number of horizontal pixels in the bitmap
      </td>
    </tr>

    <tr>
      <td valign=top>
        <tt>pitch</tt>
      </td>
      <td valign=top>
        its absolute value is the number of bytes per bitmap line; it can
        be either positive or negative dependi