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