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𝗖𝗨𝗥𝗥𝗘𝗡𝗧 𝗙𝗜𝗟𝗘 : /usr/share/gtk-doc/html/harfbuzz//object-model-blobs.html
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="object-model-blobs"></a>Blobs</h2></div></div></div>
<p>
      While most of HarfBuzz's object types are specific to the
      shaping process, <span class="emphasis"><em>blobs</em></span> are somewhat
      different.
    </p>
<p>
      Blobs are an abstraction desgined to negotiate lifecycle and
      permissions for raw pieces of data.  For example, when you load
      the raw font data into memory and want to pass it to HarfBuzz,
      you do so in a <code class="literal">hb_blob_t</code> wrapper.
    </p>
<p>
      This allows you to take advantage of HarffBuzz's
      reference-counting and <code class="function">destroy</code>
      callbacks. If you allocated the memory for the data using 
      <code class="function">malloc()</code>, you would create the blob using
    </p>
<pre class="programlisting">
      hb_blob_create (data, length, HB_MEMORY_MODE_WRITABLE, data, free)
    </pre>
<p>
      That way, HarfBuzz will call <code class="function">free()</code> on the
      allocated memory whenever the blob drops its last reference and
      is deconstructed.  Consequently, the user code can stop worrying
      about freeing memory and let the reference-counting machinery
      take care of that. 
    </p>
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