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 <div class="chapter">
 <div class="titlepage"><div><div><h2 class="title">
 <a name="buffers-language-script-and-direction"></a>Buffers, language, script and direction</h2></div></div></div>
 <div class="toc"><dl class="toc">
 <dt><span class="section"><a href="buffers-language-script-and-direction.html#creating-and-destroying-buffers">Creating and destroying buffers</a></span></dt>
 <dt><span class="section"><a href="adding-text-to-the-buffer.html">Adding text to the buffer</a></span></dt>
 <dt><span class="section"><a href="setting-buffer-properties.html">Setting buffer properties</a></span></dt>
 <dt><span class="section"><a href="what-about-the-other-scripts.html">What about the other scripts?</a></span></dt>
 <dt><span class="section"><a href="customizing-unicode-functions.html">Customizing Unicode functions</a></span></dt>
 </dl></div>
 <p>
     The input to HarfBuzz is a series of Unicode characters, stored in a
     buffer. In this chapter, we'll look at how to set up a buffer with
     the text that we want and then customize the properties of the
     buffer.
   </p>
 <div class="section">
 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
 <a name="creating-and-destroying-buffers"></a>Creating and destroying buffers</h2></div></div></div>
 <p>
       As we saw in our <span class="emphasis"><em>Getting Started</em></span> example, a
       buffer is created and
       initialized with <code class="literal">hb_buffer_create()</code>. This
       produces a new, empty buffer object, instantiated with some
       default values and ready to accept your Unicode strings.
     </p>
 <p>
       HarfBuzz manages the memory of objects (such as buffers) that it
       creates, so you don't have to. When you have finished working on
       a buffer, you can call <code class="literal">hb_buffer_destroy()</code>:
     </p>
 <pre class="programlisting">
   hb_buffer_t *buffer = hb_buffer_create();
   ...
   hb_buffer_destroy(buffer);
 </pre>
 <p>
       This will destroy the object and free its associated memory -
       unless some other part of the program holds a reference to this
       buffer. If you acquire a HarfBuzz buffer from another subsystem
       and want to ensure that it is not garbage collected by someone
       else destroying it, you should increase its reference count:
     </p>
 <pre class="programlisting">
 void somefunc(hb_buffer_t *buffer) {
   buffer = hb_buffer_reference(buffer);
   ...
 </pre>
 <p>
       And then decrease it once you're done with it:
     </p>
 <pre class="programlisting">
   hb_buffer_destroy(buffer);
 }
 </pre>
 <p>
       To throw away all the data in your buffer and start from scratch,
       call <code class="literal">hb_buffer_reset(buffer)</code>. If you want to
       throw away the string in the buffer but keep the options, you can
       instead call <code class="literal">hb_buffer_clear_contents(buffer)</code>.
     </p>
 </div>
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	<div class="chapter">
	<div class="titlepage"><div><div><h2 class="title">
	<a name="buffers-language-script-and-direction"></a>Buffers, language, script and direction</h2></div></div></div>
	<div class="toc"><dl class="toc">
	<dt><span class="section"><a href="buffers-language-script-and-direction.html#creating-and-destroying-buffers">Creating and destroying buffers</a></span></dt>
	<dt><span class="section"><a href="adding-text-to-the-buffer.html">Adding text to the buffer</a></span></dt>
	<dt><span class="section"><a href="setting-buffer-properties.html">Setting buffer properties</a></span></dt>
	<dt><span class="section"><a href="what-about-the-other-scripts.html">What about the other scripts?</a></span></dt>
	<dt><span class="section"><a href="customizing-unicode-functions.html">Customizing Unicode functions</a></span></dt>
	</dl></div>
	<p>
	The input to HarfBuzz is a series of Unicode characters, stored in a
	buffer. In this chapter, we'll look at how to set up a buffer with
	the text that we want and then customize the properties of the
	buffer.
	</p>
	<div class="section">
	<div class="titlepage"><div><div><h2 class="title" style="clear: both">
	<a name="creating-and-destroying-buffers"></a>Creating and destroying buffers</h2></div></div></div>
	<p>
	As we saw in our <span class="emphasis"><em>Getting Started</em></span> example, a
	buffer is created and
	initialized with <code class="literal">hb_buffer_create()</code>. This
	produces a new, empty buffer object, instantiated with some
	default values and ready to accept your Unicode strings.
	</p>
	<p>
	HarfBuzz manages the memory of objects (such as buffers) that it
	creates, so you don't have to. When you have finished working on
	a buffer, you can call <code class="literal">hb_buffer_destroy()</code>:
	</p>
	<pre class="programlisting">
	hb_buffer_t *buffer = hb_buffer_create();
	...
	hb_buffer_destroy(buffer);
	</pre>
	<p>
	This will destroy the object and free its associated memory -
	unless some other part of the program holds a reference to this
	buffer. If you acquire a HarfBuzz buffer from another subsystem
	and want to ensure that it is not garbage collected by someone
	else destroying it, you should increase its reference count:
	</p>
	<pre class="programlisting">
	void somefunc(hb_buffer_t *buffer) {
	buffer = hb_buffer_reference(buffer);
	...
	</pre>
	<p>
	And then decrease it once you're done with it:
	</p>
	<pre class="programlisting">
	hb_buffer_destroy(buffer);
	}
	</pre>
	<p>
	To throw away all the data in your buffer and start from scratch,
	call <code class="literal">hb_buffer_reset(buffer)</code>. If you want to
	throw away the string in the buffer but keep the options, you can
	instead call <code class="literal">hb_buffer_clear_contents(buffer)</code>.
	</p>
	</div>
	</div>
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