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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Objects in HarfBuzz: HarfBuzz Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="HarfBuzz Manual"> <link rel="up" href="object-model.html" title="The HarfBuzz object model"> <link rel="prev" href="object-model.html" title="The HarfBuzz object model"> <link rel="next" href="object-model-lifecycle.html" title="Object lifecycle management"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="object-model.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="object-model.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="object-model-lifecycle.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="object-model-object-types"></a>Objects in HarfBuzz</h2></div></div></div> <p> <span class="emphasis"><em>Object types:</em></span> Opaque struct types are used for what HarfBuzz loosely calls "objects." This doesn’t have much to do with the terminology from object-oriented programming (OOP), although some of the concepts are similar. </p> <p> In HarfBuzz, all object types provide certain lifecycle-management APIs. Objects are reference-counted, and constructed with various <code class="function">create()</code> methods, referenced via <code class="function">reference()</code> and dereferenced using <code class="function">destroy()</code>. </p> <p> For example, the <code class="literal">hb_buffer_t</code> object has <code class="function">hb_buffer_create()</code> as its constructor, <code class="function">hb_buffer_reference()</code> to reference, and <code class="function">hb_buffer_destroy()</code> to dereference. </p> <p> After construction, each object's properties are accessible only through the setter and getter functions described in the API Reference manual. </p> <p> Key object types provided by HarfBuzz include: </p> <div class="itemizedlist"><ul class="itemizedlist compact" style="list-style-type: disc; "> <li class="listitem"><p> <span class="emphasis"><em>blobs</em></span>, which act as low-level wrappers around binary data. Blobs are typically used to hold the contents of a binary font file. </p></li> <li class="listitem"><p> <span class="emphasis"><em>faces</em></span>, which represent typefaces from a font file, but without specific parameters (such as size) set. </p></li> <li class="listitem"><p> <span class="emphasis"><em>fonts</em></span>, which represent instances of a face with all of their parameters specified. </p></li> <li class="listitem"><p> <span class="emphasis"><em>buffers</em></span>, which hold Unicode code points for characters (before shaping) and the shaped glyph output (after shaping). </p></li> <li class="listitem"><p> <span class="emphasis"><em>shape plans</em></span>, which store the settings that HarfBuzz will use when shaping a particular text segment. Shape plans are not generally used by client programs directly, but as we will see in a later chapter, they are still valuable to understand. </p></li> </ul></div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>