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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="fonts-and-faces-variable"></a>Working with OpenType Variable Fonts</h2></div></div></div>
<p>
      If you are working with OpenType Variable Fonts, there are a few
      additional functions you should use to specify the
      variation-axis settings of your font object. Without doing so,
      your variable font's font object can still be used, but only at
      the default setting for every axis (which, of course, is
      sometimes what you want, but does not cover general usage).
    </p>
<p>
      HarfBuzz manages variation settings in the
      <span class="type">hb_variation_t</span> data type, which holds a <span class="property">tag</span> for the
      variation-axis identifier tag and a <span class="property">value</span> for its
      setting. You can retrieve the list of variation axes in a font
      binary from the face object (not from a font object, notably) by
      calling <code class="function">hb_ot_var_get_axis_count(face)</code> to
      find the number of axes, then using
      <code class="function">hb_ot_var_get_axis_infos()</code> to collect the 
      axis structures:
    </p>
<pre class="programlisting">
      axes = hb_ot_var_get_axis_count(face);
      ...
      hb_ot_var_get_axis_infos(face, 0, axes, axes_array);
    </pre>
<p>
      For each axis returned in the array, you can can access the
      identifier in its <span class="property">tag</span>. HarfBuzz also has
      tag definitions predefined for the five standard axes specified
      in OpenType (<code class="literal">ital</code> for italic,
      <code class="literal">opsz</code> for optical size,
      <code class="literal">slnt</code> for slant, <code class="literal">wdth</code> for
      width, and <code class="literal">wght</code> for weight). Each axis also
      has a <span class="property">min_value</span>, a
      <span class="property">default_value</span>, and a <span class="property">max_value</span>.
    </p>
<p>
      To set your font object's variation settings, you call the
      <code class="function">hb_font_set_variations()</code> function with an
      array of <span class="type">hb_variation_t</span> variation settings. Let's
      say our font has weight and width axes. We need to specify each
      of the axes by tag and assign a value on the axis:
    </p>
<pre class="programlisting">
      unsigned int variation_count = 2;
      hb_variation_t variation_data[variation_count];
      variation_data[0].tag = HB_OT_TAG_VAR_AXIS_WIDTH;
      variation_data[1].tag = HB_OT_TAG_VAR_AXIS_WEIGHT;
      variation_data[0].value = 80;
      variation_data[1].value = 750;
      ...
      hb_font_set_variations(font, variation_data, variation_count);
    </pre>
<p>
      That should give us a slightly condensed font ("normal" on the
      <code class="literal">wdth</code> axis is 100) at a noticeably bolder
      weight ("regular" is 400 on the <code class="literal">wght</code> axis).
    </p>
<p>
      In practice, though, you should always check that the value you
      want to set on the axis is within the
      [<span class="property">min_value</span>,<span class="property">max_value</span>]
      range actually implemented in the font's variation axis. After
      all, a font might only provide lighter-than-regular weights, and
      setting a heavier value on the <code class="literal">wght</code> axis will
      not change that. 
    </p>
<p>
      Once your variation settings are specified on your font object,
      however, shaping with a variable font is just like shaping a
      static font.
    </p>
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