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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>Complex scripts: 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="shaping-concepts.html" title="Shaping concepts"> <link rel="prev" href="shaping-concepts.html" title="Shaping concepts"> <link rel="next" href="shaping-operations.html" title="Shaping operations"> <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="shaping-concepts.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="shaping-concepts.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="shaping-operations.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="complex-scripts"></a>Complex scripts</h2></div></div></div> <p> In text-shaping terminology, scripts are generally classified as either <span class="emphasis"><em>complex</em></span> or <span class="emphasis"><em>non-complex</em></span>. </p> <p> Complex scripts are those for which transforming the input sequence into the final layout requires some combination of operations—such as context-dependent substitutions, context-dependent mark positioning, glyph-to-glyph joining, glyph reordering, or glyph stacking. </p> <p> In some complex scripts, the shaping rules require that a text run be divided into syllables before the operations can be applied. Other complex scripts may apply shaping operations over entire words or over the entire text run, with no subdivision required. </p> <p> Non-complex scripts, by definition, do not require these operations. However, correctly shaping a text run in a non-complex script may still involve Unicode normalization, ligature substitutions, mark positioning, kerning, and applying other font features. The key difference is that a text run in a non-complex script can be processed sequentially and in the same order as the input sequence of Unicode codepoints, without requiring an analysis stage. </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>
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