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| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="id-1.2.2.6"></a>What does HarfBuzz do?</h2></div></div></div> |
| <p> |
| HarfBuzz provides text shaping through a cross-platform |
| C API that accepts sequences of Unicode codepoints as input. Currently, |
| the following OpenType shaping models are supported: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"><p> |
| Indic (covering Devanagari, Bengali, Gujarati, |
| Gurmukhi, Kannada, Malayalam, Oriya, Tamil, Telugu, and |
| Sinhala) |
| </p></li> |
| <li class="listitem"><p> |
| Arabic (covering Arabic, N'Ko, Syriac, and Mongolian) |
| </p></li> |
| <li class="listitem"><p> |
| Thai and Lao |
| </p></li> |
| <li class="listitem"><p> |
| Khmer |
| </p></li> |
| <li class="listitem"><p> |
| Myanmar |
| </p></li> |
| <li class="listitem"><p> |
| Tibetan |
| </p></li> |
| <li class="listitem"><p> |
| Hangul |
| </p></li> |
| <li class="listitem"><p> |
| Hebrew |
| </p></li> |
| <li class="listitem"><p> |
| The Universal Shaping Engine or <span class="emphasis"><em>USE</em></span> |
| (covering complex scripts not covered by the above shaping |
| models) |
| </p></li> |
| <li class="listitem"><p> |
| A default shaping model for non-complex scripts |
| (covering Latin, Cyrillic, Greek, Armenian, Georgian, Tifinagh, |
| and many others) |
| </p></li> |
| <li class="listitem"><p> |
| Emoji (including emoji modifier sequences, flag sequences, |
| and ZWJ sequences) |
| </p></li> |
| </ul></div> |
| <p> |
| In addition to OpenType shaping, HarfBuzz supports the latest |
| version of Graphite shaping (the "Graphite 2" model) and AAT |
| shaping. |
| </p> |
| <p> |
| HarfBuzz can read and understand TrueType fonts (.ttf), TrueType |
| collections (.ttc), and OpenType fonts (.otf, including those |
| fonts that contain TrueType-style outlines and those that |
| contain PostScript CFF or CFF2 outlines). |
| </p> |
| <p> |
| HarfBuzz is designed and tested to run on top of the FreeType |
| font renderer. It can run on Linux, Android, Windows, macOS, and |
| iOS systems. |
| </p> |
| <p> |
| In addition to its core shaping functionality, HarfBuzz provides |
| functions for accessing other font features, including optional |
| GSUB and GPOS OpenType features, as well as |
| all color-font formats (<code class="literal">CBDT</code>, |
| <code class="literal">sbix</code>, <code class="literal">COLR/CPAL</code>, and |
| <code class="literal">SVG-OT</code>) and OpenType variable fonts. HarfBuzz |
| also includes a font-subsetting feature. HarfBuzz can perform |
| some low-level math-shaping operations, although it does not |
| currently perform full shaping for mathematical typesetting. |
| </p> |
| <p> |
| A suite of command-line utilities is also provided in the |
| source-code tree, designed to help users test and debug |
| HarfBuzz's features on real-world fonts and input. |
| </p> |
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