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   5 <title>What does HarfBuzz do?: HarfBuzz Manual</title>
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  23 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  24 <a name="id-1.2.2.6"></a>What does HarfBuzz do?</h2></div></div></div>
  25 <p>
  26       HarfBuzz provides text shaping through a cross-platform
  27       C API that accepts sequences of Unicode codepoints as input. Currently,
  28       the following OpenType shaping models are supported:
  29     </p>
  30 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  31 <li class="listitem"><p>
  32           Indic (covering Devanagari, Bengali, Gujarati,
  33           Gurmukhi, Kannada, Malayalam, Oriya, Tamil, Telugu, and
  34           Sinhala)
  35         </p></li>
  36 <li class="listitem"><p>
  37           Arabic (covering Arabic, N'Ko, Syriac, and Mongolian)
  38         </p></li>
  39 <li class="listitem"><p>
  40           Thai and Lao
  41         </p></li>
  42 <li class="listitem"><p>
  43           Khmer
  44         </p></li>
  45 <li class="listitem"><p>
  46           Myanmar
  47         </p></li>
  48 <li class="listitem"><p>
  49           Tibetan
  50         </p></li>
  51 <li class="listitem"><p>
  52           Hangul
  53         </p></li>
  54 <li class="listitem"><p>
  55           Hebrew
  56         </p></li>
  57 <li class="listitem"><p>
  58           The Universal Shaping Engine or <span class="emphasis"><em>USE</em></span>
  59           (covering complex scripts not covered by the above shaping
  60           models)
  61         </p></li>
  62 <li class="listitem"><p>
  63           A default shaping model for non-complex scripts
  64           (covering Latin, Cyrillic, Greek, Armenian, Georgian, Tifinagh,
  65           and many others)
  66         </p></li>
  67 <li class="listitem"><p>
  68           Emoji (including emoji modifier sequences, flag sequences,
  69           and ZWJ sequences)
  70         </p></li>
  71 </ul></div>
  72 <p>
  73       In addition to OpenType shaping, HarfBuzz supports the latest
  74       version of Graphite shaping (the "Graphite 2" model) and AAT
  75       shaping.
  76     </p>
  77 <p>
  78       HarfBuzz can read and understand TrueType fonts (.ttf), TrueType
  79       collections (.ttc), and OpenType fonts (.otf, including those
  80       fonts that contain TrueType-style outlines and those that
  81       contain PostScript CFF or CFF2 outlines).
  82     </p>
  83 <p>
  84       HarfBuzz is designed and tested to run on top of the FreeType
  85       font renderer. It can run on Linux, Android, Windows, macOS, and
  86       iOS systems.
  87     </p>
  88 <p>
  89       In addition to its core shaping functionality, HarfBuzz provides
  90       functions for accessing other font features, including optional
  91       GSUB and GPOS OpenType features, as well as
  92       all color-font formats (<code class="literal">CBDT</code>,
  93       <code class="literal">sbix</code>, <code class="literal">COLR/CPAL</code>, and
  94       <code class="literal">SVG-OT</code>) and OpenType variable fonts. HarfBuzz
  95       also includes a font-subsetting feature. HarfBuzz can perform
  96       some low-level math-shaping operations, although it does not
  97       currently perform full shaping for mathematical typesetting.
  98     </p>
  99 <p>
 100       A suite of command-line utilities is also provided in the
 101       source-code tree, designed to help users test and debug
 102       HarfBuzz's features on real-world fonts and input.
 103     </p>
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