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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>HarfBuzz Manual: HarfBuzz Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <meta name="description" content="HarfBuzz HarfBuzz is a text shaping library. Using the HarfBuzz library allows programs to convert a sequence of Unicode input into properly formatted and positioned glyph output—for any writing system and language. The canonical source-code tree is available at github.com/harfbuzz/harfbuzz. See for release tarballs."> <link rel="home" href="index.html" title="HarfBuzz Manual"> <link rel="next" href="pt01.html" title="Part I. User's manual"> <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"> <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 a text shaping library. Using the HarfBuzz library allows programs to convert a sequence of Unicode input into properly formatted and positioned glyph output—for any writing system and language. </p> <p> The canonical source-code tree is available at <a class="ulink" href="https://github.com/harfbuzz/harfbuzz" target="_top">github.com/harfbuzz/harfbuzz</a>. See <a class="xref" href="install-harfbuzz.html#download" title="Downloading HarfBuzz">Downloading HarfBuzz</a> for release tarballs. </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#what-is-text-shaping">What is text shaping?</a></span></dt> <dt><span class="section"><a href="why-do-i-need-a-shaping-engine.html">Why do I need a shaping engine?</a></span></dt> <dt><span class="section"><a href="ch01s03.html">What does HarfBuzz do?</a></span></dt> <dt><span class="section"><a href="what-harfbuzz-doesnt-do.html">What HarfBuzz doesn't do</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">Installing HarfBuzz</a></span></dt> <dd><dl> <dt><span class="section"><a href="install-harfbuzz.html#download">Downloading HarfBuzz</a></span></dt> <dt><span class="section"><a href="building.html">Building HarfBuzz</a></span></dt> <dd><dl> <dt><span class="section"><a href="building.html#building.linux">Building on Linux</a></span></dt> <dt><span class="section"><a href="building.html#building.windows">Building on Windows</a></span></dt> <dt><span class="section"><a href="building.html#building.macos">Building on macOS</a></span></dt> <dt><span class="section"><a href="building.html#configuration">Configuration options</a></span></dt> </dl></dd> </dl></dd> <dt><span class="chapter"><a href="getting-started.html">Getting started with HarfBuzz</a></span></dt> <dd><dl> <dt><span class="section"><a href="getting-started.html#id-1.2.4.2">An overview of the HarfBuzz shaping API</a></span></dt> <dt><span class="section"><a href="ch03s02.html">Terminology</a></span></dt> <dt><span class="section"><a href="ch03s03.html">A simple shaping example</a></span></dt> </dl></dd> <dt><span class="chapter"><a href="shaping-concepts.html">Shaping concepts</a></span></dt> <dd><dl> <dt><span class="section"><a href="shaping-concepts.html#text-shaping-concepts">Text shaping</a></span></dt> <dt><span class="section"><a href="complex-scripts.html">Complex scripts</a></span></dt> <dt><span class="section"><a href="shaping-operations.html">Shaping operations</a></span></dt> <dt><span class="section"><a href="unicode-character-categories.html">Unicode character categories</a></span></dt> <dt><span class="section"><a href="text-runs.html">Text runs</a></span></dt> <dt><span class="section"><a href="opentype-shaping-models.html">OpenType shaping models</a></span></dt> <dt><span class="section"><a href="graphite-shaping.html">Graphite shaping</a></span></dt> <dt><span class="section"><a href="aat-shaping.html">AAT shaping</a></span></dt> </dl></dd> <dt><span class="chapter"><a href="object-model.html">The HarfBuzz object model</a></span></dt> <dd><dl> <dt><span class="section"><a href="object-model.html#object-model-intro">An overview of data types in HarfBuzz</a></span></dt> <dt><span class="section"><a href="object-model-object-types.html">Objects in HarfBuzz</a></span></dt> <dt><span class="section"><a href="object-model-lifecycle.html">Object lifecycle management</a></span></dt> <dt><span class="section"><a href="object-model-user-data.html">User data</a></span></dt> <dt><span class="section"><a href="object-model-blobs.html">Blobs</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="customizing-unicode-functions.html">Customizing Unicode functions</a></span></dt> </dl></dd> <dt><span class="chapter"><a href="fonts-and-faces.html">Fonts, faces, and output</a></span></dt> <dd><dl> <dt><span class="section"><a href="fonts-and-faces.html#fonts-and-faces-objects">Font and face objects</a></span></dt> <dt><span class="section"><a href="fonts-and-faces-custom-functions.html">Customizing font functions</a></span></dt> <dt><span class="section"><a href="fonts-and-faces-native-opentype.html">Font objects and HarfBuzz's native OpenType implementation</a></span></dt> <dt><span class="section"><a href="fonts-and-faces-variable.html">Working with OpenType Variable Fonts</a></span></dt> </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#shaping-buffer-output">Shaping and buffer output</a></span></dt> <dt><span class="section"><a href="shaping-opentype-features.html">OpenType features</a></span></dt> <dt><span class="section"><a href="shaping-shaper-selection.html">Shaper selection</a></span></dt> <dt><span class="section"><a href="shaping-plans-and-caching.html">Plans and caching</a></span></dt> </dl></dd> <dt><span class="chapter"><a href="clusters.html">Clusters</a></span></dt> <dd><dl> <dt><span class="section"><a href="clusters.html#clusters-and-shaping">Clusters and shaping</a></span></dt> <dt><span class="section"><a href="working-with-harfbuzz-clusters.html">Working with HarfBuzz clusters</a></span></dt> <dt><span class="section"><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="section"><a href="reordering-in-levels-0-and-1.html">Reordering in levels 0 and 1</a></span></dt> <dt><span class="section"><a href="the-distinction-between-levels-0-and-1.html">The distinction between levels 0 and 1</a></span></dt> <dt><span class="section"><a href="level-2.html">Level 2</a></span></dt> <dd><dl> <dt><span class="section"><a href="level-2.html#ligatures-with-combining-marks-in-level-2">Ligatures with combining marks in level 2</a></span></dt> <dt><span class="section"><a href="level-2.html#reordering-in-level-2">Reordering in level 2</a></span></dt> <dt><span class="section"><a href="level-2.html#other-considerations-in-level-2">Other considerations in level 2</a></span></dt> </dl></dd> </dl></dd> <dt><span class="chapter"><a href="utilities.html">Utilities</a></span></dt> <dd><dl> <dt><span class="section"><a href="utilities.html#utilities-command-line-tools">Command-line tools</a></span></dt> <dd><dl> <dt><span class="section"><a href="utilities.html#utilities-command-line-hbshape">hb-shape</a></span></dt> <dt><span class="section"><a href="utilities.html#utilities-command-line-hbview">hb-view</a></span></dt> <dt><span class="section"><a href="utilities.html#utilities-command-line-hbsubset">hb-subset</a></span></dt> </dl></dd> <dt><span class="section"><a href="utilities-common-types-apis.html">Common data types and APIs</a></span></dt> <dt><span class="section"><a href="utilities-ucdn.html">UCDN</a></span></dt> </dl></dd> <dt><span class="chapter"><a href="integration.html">Platform Integration Guide</a></span></dt> <dd><dl> <dt><span class="section"><a href="integration.html#integration-glib">GNOME integration, GLib, and GObject</a></span></dt> <dt><span class="section"><a href="integration-freetype.html">FreeType integration</a></span></dt> <dt><span class="section"><a href="integration-uniscribe.html">Uniscribe integration</a></span></dt> <dt><span class="section"><a href="integration-coretext.html">Core Text integration</a></span></dt> <dt><span class="section"><a href="integration-icu.html">ICU integration</a></span></dt> <dt><span class="section"><a href="integration-python.html">Python bindings</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="ch12.html">Core API</a></span></dt> <dd><dl> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-blob.html">hb-blob</a></span><span class="refpurpose"> — Binary data containers</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-buffer.html">hb-buffer</a></span><span class="refpurpose"> — Input and output buffers</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-common.html">hb-common</a></span><span class="refpurpose"> — Common data types</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-deprecated.html">hb-deprecated</a></span><span class="refpurpose"> — Deprecated API</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-face.html">hb-face</a></span><span class="refpurpose"> — Font face objects</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-font.html">hb-font</a></span><span class="refpurpose"> — Font objects</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-map.html">hb-map</a></span><span class="refpurpose"> — Object representing integer to integer mapping</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-set.html">hb-set</a></span><span class="refpurpose"> — Objects representing a set of integers</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-shape-plan.html">hb-shape-plan</a></span><span class="refpurpose"> — Object representing a shaping plan</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-shape.html">hb-shape</a></span><span class="refpurpose"> — Conversion of text strings into positioned glyphs</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-unicode.html">hb-unicode</a></span><span class="refpurpose"> — Unicode character property access</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-version.html">hb-version</a></span><span class="refpurpose"> — Information about the version of HarfBuzz in use</span> </dt> </dl></dd> <dt><span class="chapter"><a href="ch13.html">OpenType API</a></span></dt> <dd><dl> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-color.html">hb-ot-color</a></span><span class="refpurpose"> — OpenType Color Fonts</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-font.html">hb-ot-font</a></span><span class="refpurpose"> — OpenType font implementation</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-layout.html">hb-ot-layout</a></span><span class="refpurpose"> — OpenType Layout</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-math.html">hb-ot-math</a></span><span class="refpurpose"> — OpenType Math information</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-meta.html">hb-ot-meta</a></span><span class="refpurpose"> — OpenType Metadata</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-metrics.html">hb-ot-metrics</a></span><span class="refpurpose"> — OpenType Metrics</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-name.html">hb-ot-name</a></span><span class="refpurpose"> — OpenType font name information</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-shape.html">hb-ot-shape</a></span><span class="refpurpose"> — OpenType shaping support</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ot-var.html">hb-ot-var</a></span><span class="refpurpose"> — OpenType Font Variations</span> </dt> </dl></dd> <dt><span class="chapter"><a href="ch14.html">Apple Advanced Typography API</a></span></dt> <dd><dl><dt> <span class="refentrytitle"><a href="harfbuzz-hb-aat-layout.html">hb-aat-layout</a></span><span class="refpurpose"> — Apple Advanced Typography Layout</span> </dt></dl></dd> <dt><span class="chapter"><a href="ch15.html">Integration API</a></span></dt> <dd><dl> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-coretext.html">hb-coretext</a></span><span class="refpurpose"> — CoreText integration</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-ft.html">hb-ft</a></span><span class="refpurpose"> — FreeType integration</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-glib.html">hb-glib</a></span><span class="refpurpose"> — GLib integration</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-gobject.html">hb-gobject</a></span><span class="refpurpose"> — GObject integration support</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-graphite2.html">hb-graphite2</a></span><span class="refpurpose"> — Graphite2 integration</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-icu.html">hb-icu</a></span><span class="refpurpose"> — ICU integration</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-uniscribe.html">hb-uniscribe</a></span><span class="refpurpose"> — Windows integration</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-gdi.html">hb-gdi</a></span><span class="refpurpose"> — GDI integration</span> </dt> <dt> <span class="refentrytitle"><a href="harfbuzz-hb-directwrite.html">hb-directwrite</a></span><span class="refpurpose"> — DirectWrite integration</span> </dt> </dl></dd> <dt><span class="index"><a href="api-index-full.html">API Index</a></span></dt> <dt><span class="index"><a href="deprecated-api-index.html">Index of deprecated API</a></span></dt> <dt><span class="index"><a href="api-index-2-7-3.html">Index of new symbols in 2.7.3</a></span></dt> <dt><span class="index"><a href="api-index-2-6-0.html">Index of new symbols in 2.6.0</a></span></dt> <dt><span class="index"><a href="api-index-2-5-0.html">Index of new symbols in 2.5.0</a></span></dt> <dt><span class="index"><a href="api-index-2-4-0.html">Index of new symbols in 2.4.0</a></span></dt> <dt><span class="index"><a href="api-index-2-3-0.html">Index of new symbols in 2.3.0</a></span></dt> <dt><span class="index"><a 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