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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>HarfBuzz Manual: HarfBuzz Manual</title>
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<meta name="description" content="HarfBuzz  HarfBuzz is an OpenType text shaping engine. The current HarfBuzz codebase, formerly known as harfbuzz-ng, is versioned 1.x.x and is stable and under active maintenance. This is what is used in latest versions of Firefox, GNOME, ChromeOS, Chrome, LibreOffice, XeTeX, Android, and KDE, among other places. The canonical source tree is available here. Also available on github. See for release tarballs. The old HarfBuzz codebase, these days known as harfbuzz-old, was derived from FreeType, Pango, and Qt and is available here. It is not actively developed or maintained, and is extremely buggy. All users are encouraged to switch over to the new HarfBuzz as soon as possible. There are no release tarballs of old HarfBuzz whatsoever.">
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<link rel="next" href="pt01.html" title="Part I. User's manual">
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<div class="book">
<div class="titlepage">
<div>
<div><table class="navigation" id="top" width="100%" cellpadding="2" cellspacing="0"><tr><th valign="middle"><p class="title">HarfBuzz Manual</p></th></tr></table></div>
<div><div class="abstract">
<p class="title"><b>HarfBuzz</b></p>
<div align="center"><img src="HarfBuzz.png" align="middle"></div>
<p>
        HarfBuzz is an <a class="ulink" href="http://www.microsoft.com/typography/otspec/" target="_top">OpenType</a>
        text shaping engine.
      </p>
<p>
        The current HarfBuzz codebase, formerly known as harfbuzz-ng, is
        versioned 1.x.x and is stable and under active maintenance. This is
        what is used in latest versions of Firefox, GNOME, ChromeOS, Chrome,
        LibreOffice, XeTeX, Android, and KDE, among other places. The canonical
        source tree is available
        <a class="ulink" href="http://cgit.freedesktop.org/harfbuzz/" target="_top">here</a>.
        Also available on
        <a class="ulink" href="https://github.com/harfbuzz/harfbuzz" target="_top">github</a>.
        See <a class="xref" href="install-harfbuzz.html#download" title="Download">Download</a> for release tarballs.
      </p>
<p>
        The old HarfBuzz codebase, these days known as harfbuzz-old, was
        derived from <a class="ulink" href="http://freetype.org/" target="_top">FreeType</a>,
        <a class="ulink" href="http://pango.org/" target="_top">Pango</a>, and
        <a class="ulink" href="http://qt-project.org/" target="_top">Qt</a> and is available
        <a class="ulink" href="http://cgit.freedesktop.org/harfbuzz.old/" target="_top">here</a>.
        It is not actively developed or maintained, and is extremely buggy. All
        users are encouraged to switch over to the new HarfBuzz as soon as
        possible.  There are no release tarballs of old HarfBuzz whatsoever.
      </p>
</div></div>
</div>
<hr>
</div>
<div class="toc"><dl class="toc">
<dt><span class="part"><a href="pt01.html">I. User's manual</a></span></dt>
<dd><dl>
<dt><span class="chapter"><a href="what-is-harfbuzz.html">What is Harfbuzz?</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="what-is-harfbuzz.html#why-do-i-need-it">Why do I need it?</a></span></dt>
<dt><span class="section"><a href="why-is-it-called-harfbuzz.html">Why is it called Harfbuzz?</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="install-harfbuzz.html">Install Harfbuzz</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="install-harfbuzz.html#download">Download</a></span></dt>
<dt><span class="section"><a href="building.html">Building</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="hello-harfbuzz.html">Hello, Harfbuzz</a></span></dt>
<dd><dl><dt><span class="section"><a href="hello-harfbuzz.html#what-harfbuzz-doesnt-do">What Harfbuzz doesn't do</a></span></dt></dl></dd>
<dt><span class="chapter"><a href="buffers-language-script-and-direction.html">Buffers, language, script and direction</a></span></dt>
<dd><dl>
<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></dd>
<dt><span class="chapter"><a href="fonts-and-faces.html">Fonts and faces</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="fonts-and-faces.html#using-freetype">Using FreeType</a></span></dt>
<dt><span class="section"><a href="using-harfbuzzs-native-opentype-implementation.html">Using Harfbuzz's native OpenType implementation</a></span></dt>
<dt><span class="section"><a href="using-your-own-font-functions.html">Using your own font functions</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="clusters.html"></a></span></dt>
<dd><dl>
<dt><span class="sect1"><a href="clusters.html#clusters">Clusters</a></span></dt>
<dt><span class="sect1"><a href="a-clustering-example-for-levels-0-and-1.html">A clustering example for levels 0 and 1</a></span></dt>
<dt><span class="sect1"><a href="reordering-in-levels-0-and-1.html">Reordering in levels 0 and 1</a></span></dt>
<dt><span class="sect1"><a href="the-distinction-between-levels-0-and-1.html">The distinction between levels 0 and 1</a></span></dt>
<dt><span class="sect1"><a href="level-2.html">Level 2</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="level-2.html#ligatures-with-combining-marks">Ligatures with combining marks</a></span></dt>
<dt><span class="sect2"><a href="level-2.html#reordering">Reordering</a></span></dt>
</dl></dd>
</dl></dd>
<dt><span class="chapter"><a href="shaping-and-shape-plans.html">Shaping and shape plans</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="shaping-and-shape-plans.html#opentype-features">OpenType features</a></span></dt>
<dt><span class="section"><a href="plans-and-caching.html">Plans and caching</a></span></dt>
</dl></dd>
</dl></dd>
<dt><span class="part"><a href="pt02.html">II. Reference manual</a></span></dt>
<dd><dl>
<dt><span class="chapter"><a href="ch08.html">Harfbuzz API</a></span></dt>
<dd><dl>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb.html">hb</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-common.html">hb-common</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-unicode.html">hb-unicode</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-Buffers.html">Buffers</a></span><span class="refpurpose"> — Input and output buffers</span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-blob.html">hb-blob</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-face.html">hb-face</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-font.html">hb-font</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-Shaping.html">Shaping</a></span><span class="refpurpose"> — Conversion of text strings into positioned glyphs</span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-version.html">hb-version</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-deprecated.html">hb-deprecated</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-set.html">hb-set</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-ot.html">hb-ot</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-ot-layout.html">hb-ot-layout</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-ot-tag.html">hb-ot-tag</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-ot-font.html">hb-ot-font</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-ot-shape.html">hb-ot-shape</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-ot-math.html">hb-ot-math</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-shape-plan.html">hb-shape-plan</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-glib.html">hb-glib</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-icu.html">hb-icu</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-ft.html">hb-ft</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-graphite2.html">hb-graphite2</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-uniscribe.html">hb-uniscribe</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-coretext.html">hb-coretext</a></span><span class="refpurpose"></span>
</dt>
<dt>
<span class="refentrytitle"><a href="harfbuzz-hb-gobject.html">hb-gobject</a></span><span class="refpurpose"></span>
</dt>
</dl></dd>
<dt><span class="chapter"><a href="object-tree.html">Object Hierarchy</a></span></dt>
<dt><span class="index"><a href="api-index-full.html">API Index</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-2.html">Index of new symbols in 0.9.2</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-5.html">Index of new symbols in 0.9.5</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-7.html">Index of new symbols in 0.9.7</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-8.html">Index of new symbols in 0.9.8</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-10.html">Index of new symbols in 0.9.10</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-11.html">Index of new symbols in 0.9.11</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-20.html">Index of new symbols in 0.9.20</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-22.html">Index of new symbols in 0.9.22</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-28.html">Index of new symbols in 0.9.28</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-30.html">Index of new symbols in 0.9.30</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-31.html">Index of new symbols in 0.9.31</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-38.html">Index of new symbols in 0.9.38</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-39.html">Index of new symbols in 0.9.39</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-41.html">Index of new symbols in 0.9.41</a></span></dt>
<dt><span class="index"><a href="api-index-0-9-42.html">Index of new symbols in 0.9.42</a></span></dt>
<dt><span class="index"><a href="api-index-1-0-5.html">Index of new symbols in 1.0.5</a></span></dt>
<dt><span class="index"><a href="api-index-1-1-2.html">Index of new symbols in 1.1.2</a></span></dt>
<dt><span class="index"><a href="api-index-1-1-3.html">Index of new symbols in 1.1.3</a></span></dt>
<dt><span class="index"><a href="api-index-1-2-3.html">Index of new symbols in 1.2.3</a></span></dt>
<dt><span class="index"><a href="api-index-1-3-3.html">Index of new symbols in 1.3.3</a></span></dt>
<dt><span class="index"><a href="api-index-1-4-2.html">Index of new symbols in 1.4.2</a></span></dt>
<dt><span class="index"><a href="api-index-1-4-3.html">Index of new symbols in 1.4.3</a></span></dt>
<dt><span class="index"><a href="api-index-1-5-0.html">Index of new symbols in 1.5.0</a></span></dt>
<dt><span class="index"><a href="api-index-1-6-0.html">Index of new symbols in 1.6.0</a></span></dt>
<dt><span class="index"><a href="deprecated-api-index.html">Index of deprecated API</a></span></dt>
<dt><span class="glossary"><a href="annotation-glossary.html">Annotation Glossary</a></span></dt>
</dl></dd>
</dl></div>
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