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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>ICU integration: HarfBuzz Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="HarfBuzz Manual"> <link rel="up" href="integration.html" title="Platform Integration Guide"> <link rel="prev" href="integration-coretext.html" title="Core Text integration"> <link rel="next" href="integration-python.html" title="Python bindings"> <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"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="integration.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="integration-coretext.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="integration-python.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="integration-icu"></a>ICU integration</h2></div></div></div> <p> Although HarfBuzz includes its own Unicode-data functions, it also provides integration APIs for using the International Components for Unicode (ICU) library as a source of Unicode data on any supported platform. </p> <p> The principal integration point with ICU is the <span class="type">hb_unicode_funcs_t</span> Unicode-functions structure attached to a buffer. This structure holds the virtual methods used for retrieving Unicode character properties, such as General Category, Script, Combining Class, decomposition mappings, and mirroring information. </p> <p> To use ICU in your client program, you need to call <code class="function">hb_icu_get_unicode_funcs()</code>, which creates a Unicode-functions structure populated with the ICU function for each included method. Subsequently, you can attach the Unicode-functions structure to your buffer: </p> <pre class="programlisting"> hb_unicode_funcs_t *icufunctions; icufunctions = hb_icu_get_unicode_funcs(); hb_buffer_set_unicode_funcs(buf, icufunctions); </pre> <p> and ICU will be used for Unicode-data access. </p> <p> HarfBuzz also supplies a pair of functions (<code class="function">hb_icu_script_from_script()</code> and <code class="function">hb_icu_script_to_script()</code>) for converting between ICU's and HarfBuzz's internal enumerations of Unicode scripts. The <code class="function">hb_icu_script_from_script()</code> function converts from a HarfBuzz <span class="type">hb_script_t</span> to an ICU <span class="type">UScriptCode</span>. The <code class="function">hb_icu_script_to_script()</code> function does the reverse: converting from a <span class="type">UScriptCode</span> identifier to a <span class="type">hb_script_t</span>. </p> <p> By default, HarfBuzz's ICU support is built as a separate shared library (<code class="filename">libharfbuzz-icu.so</code>) when compiling HarfBuzz from source. This allows client programs that do not need ICU to link against HarfBuzz without unnecessarily adding ICU as a dependency. You can also build HarfBuzz with ICU support built directly into the main HarfBuzz shared library (<code class="filename">libharfbuzz.so</code>), by specifying the <code class="literal">--with-icu=builtin</code> compile-time option. </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>