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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>
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HarfBuzz.png
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HarfBuzz.svg
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a-clustering-example-for-levels-0-and-1.html
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aat-shaping.html
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adding-text-to-the-buffer.html
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annotation-glossary.html
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api-index-0-9-10.html
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api-index-2-6-0.html
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api-index-full.html
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buffers-language-script-and-direction.html
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building.html
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ch01s03.html
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ch03s02.html
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ch03s03.html
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ch12.html
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ch13.html
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ch14.html
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ch15.html
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clusters.html
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complex-scripts.html
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customizing-unicode-functions.html
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deprecated-api-index.html
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fonts-and-faces-custom-functions.html
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fonts-and-faces-native-opentype.html
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fonts-and-faces-variable.html
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fonts-and-faces.html
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getting-started.html
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graphite-shaping.html
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harfbuzz-hb-aat-layout.html
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harfbuzz-hb-blob.html
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harfbuzz-hb-buffer.html
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harfbuzz-hb-common.html
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harfbuzz-hb-coretext.html
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harfbuzz-hb-icu.html
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harfbuzz-hb-map.html
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harfbuzz-hb-ot-color.html
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harfbuzz-hb-ot-var.html
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harfbuzz-hb-set.html
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harfbuzz-hb-shape-plan.html
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harfbuzz-hb-unicode.html
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harfbuzz-hb-uniscribe.html
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harfbuzz-hb-version.html
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harfbuzz.devhelp2
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home.png
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index.html
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install-harfbuzz.html
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integration-coretext.html
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integration-freetype.html
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integration-icu.html
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integration-python.html
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integration-uniscribe.html
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integration.html
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left-insensitive.png
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left.png
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level-2.html
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object-model-blobs.html
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object-model-lifecycle.html
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object-model-object-types.html
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object-model-user-data.html
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object-model.html
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opentype-shaping-models.html
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pt01.html
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pt02.html
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reordering-in-levels-0-and-1.html
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right-insensitive.png
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right.png
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setting-buffer-properties.html
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shaping-and-shape-plans.html
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shaping-concepts.html
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shaping-opentype-features.html
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shaping-operations.html
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shaping-plans-and-caching.html
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shaping-shaper-selection.html
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style.css
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text-runs.html
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the-distinction-between-levels-0-and-1.html
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unicode-character-categories.html
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up-insensitive.png
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up.png
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utilities-common-types-apis.html
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utilities-ucdn.html
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utilities.html
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what-harfbuzz-doesnt-do.html
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what-is-harfbuzz.html
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why-do-i-need-a-shaping-engine.html
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why-is-it-called-harfbuzz.html
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working-with-harfbuzz-clusters.html
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