ffer are stored in ascending or descending
    order.</p>

    <p>Remember that FreeType uses the <em>Y&nbsp;upwards</em> convention in
    the 2D plane, which means that a coordinate of (0,0) always refer to the
    <em>lower-left corner</em> of a bitmap.</p>

    <p>If the pitch is positive, the rows are stored in decreasing vertical
    position; the first bytes of the pixel buffer are part of the
    <em>upper</em> bitmap row.</p>

    <p>On the opposite, if the pitch is negative, the first bytes of the