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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>Text runs: 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="unicode-character-categories.html" title="Unicode character categories"> <link rel="next" href="opentype-shaping-models.html" title="OpenType shaping models"> <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="unicode-character-categories.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="opentype-shaping-models.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="text-runs"></a>Text runs</h2></div></div></div> <p> Real-world text usually contains codepoints from a mixture of different Unicode scripts (including punctuation, numbers, symbols, white-space characters, and other codepoints that do not belong to any script). Real-world text may also be marked up with formatting that changes font properties (including the font, font style, and font size). </p> <p> For shaping purposes, all real-world text streams must be first segmented into runs that have a uniform set of properties. </p> <p> In particular, shaping models always assume that every codepoint in a text run has the same <span class="emphasis"><em>direction</em></span>, <span class="emphasis"><em>script</em></span> tag, and <span class="emphasis"><em>language</em></span> tag. </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>