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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>Utilities: 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="pt01.html" title="Part I. User's manual"> <link rel="prev" href="level-2.html" title="Level 2"> <link rel="next" href="utilities-common-types-apis.html" title="Common data types and APIs"> <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="pt01.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="level-2.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="utilities-common-types-apis.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="chapter"> <div class="titlepage"><div><div><h2 class="title"> <a name="utilities"></a>Utilities</h2></div></div></div> <div class="toc"><dl class="toc"> <dt><span class="section"><a href="utilities.html#utilities-command-line-tools">Command-line tools</a></span></dt> <dd><dl> <dt><span class="section"><a href="utilities.html#utilities-command-line-hbshape">hb-shape</a></span></dt> <dt><span class="section"><a href="utilities.html#utilities-command-line-hbview">hb-view</a></span></dt> <dt><span class="section"><a href="utilities.html#utilities-command-line-hbsubset">hb-subset</a></span></dt> </dl></dd> <dt><span class="section"><a href="utilities-common-types-apis.html">Common data types and APIs</a></span></dt> <dt><span class="section"><a href="utilities-ucdn.html">UCDN</a></span></dt> </dl></div> <p> HarfBuzz includes several auxiliary components in addition to the main APIs. These include a set of command-line tools, a set of lower-level APIs for common data types that may be of interest to client programs, and an embedded library for working with Unicode Character Database (UCD) data. </p> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="utilities-command-line-tools"></a>Command-line tools</h2></div></div></div> <p> HarfBuzz include three command-line tools: <span class="command"><strong>hb-shape</strong></span>, <span class="command"><strong>hb-view</strong></span>, and <span class="command"><strong>hb-subset</strong></span>. They can be used to examine HarfBuzz's functionality, debug font binaries, or explore the various shaping models and features from a terminal. </p> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="utilities-command-line-hbshape"></a>hb-shape</h3></div></div></div> <p> <span class="emphasis"><em><span class="command"><strong>hb-shape</strong></span></em></span> allows you to run HarfBuzz's <code class="function">hb_shape()</code> function on an input string and to examine the outcome, in human-readable form, as terminal output. <span class="command"><strong>hb-shape</strong></span> does <span class="emphasis"><em>not</em></span> render the results of the shaping call into rendered text (you can use <span class="command"><strong>hb-view</strong></span>, below, for that). Instead, it prints out the final glyph indices and positions, taking all shaping operations into account, as if the input string were a HarfBuzz input buffer. </p> <p> You can specify the font to be used for shaping and, with command-line options, you can add various aspects of the internal state to the output that is sent to the terminal. The general format is </p> <pre class="programlisting"> <span class="command"><strong>hb-shape</strong></span> [<span class="optional">[OPTIONS]</span>] <em class="parameter"><code>path/to/font/file.ttf</code></em> <em class="parameter"><code>yourinputtext</code></em> </pre> <p> The default output format is plain text (although JSON output can be selected instead by specifying the option [<span class="optional">--output-format=json</span>]). The default output syntax reports each glyph name (or glyph index if there is no name) followed by its cluster value, its horizontal and vertical position displacement, and its horizontal and vertical advances. </p> <p> Output options exist to skip any of these elements in the output, and to include additional data, such as Unicode code-point values, glyph extents, glyph flags, or interim shaping results. </p> <p> Output can also be redirected to a file, or input read from a file. Additional options enable you to enable or disable specific font features, to set variation-font axis values, to alter the language, script, direction, and clustering settings used, to enable sanity checks, or to change which shaping engine is used. </p> <p> For a complete explanation of the options available, run </p> <pre class="programlisting"> <span class="command"><strong>hb-shape</strong></span> <em class="parameter"><code>--help</code></em> </pre> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="utilities-command-line-hbview"></a>hb-view</h3></div></div></div> <p> <span class="emphasis"><em><span class="command"><strong>hb-view</strong></span></em></span> allows you to see the shaped output of an input string in rendered form. Like <span class="command"><strong>hb-shape</strong></span>, <span class="command"><strong>hb-view</strong></span> takes a font file and a text string as its arguments: </p> <pre class="programlisting"> <span class="command"><strong>hb-view</strong></span> [<span class="optional">[OPTIONS]</span>] <em class="parameter"><code>path/to/font/file.ttf</code></em> <em class="parameter"><code>yourinputtext</code></em> </pre> <p> By default, <span class="command"><strong>hb-view</strong></span> renders the shaped text in ASCII block-character images as terminal output. By appending the <span class="command"><strong>--output-file=[<span class="optional">filename</span>]</strong></span> switch, you can write the output to a PNG, SVG, or PDF file (among other formats). </p> <p> As with <span class="command"><strong>hb-shape</strong></span>, a lengthy set of options is available, with which you can enable or disable specific font features, set variation-font axis values, alter the language, script, direction, and clustering settings used, enable sanity checks, or change which shaping engine is used. </p> <p> You can also set the foreground and background colors used for the output, independently control the width of all four margins, alter the line spacing, and annotate the output image with </p> <p> In general, <span class="command"><strong>hb-view</strong></span> is a quick way to verify that the output of HarfBuzz's shaping operation looks correct for a given text-and-font combination, but you may want to use <span class="command"><strong>hb-shape</strong></span> to figure out exactly why something does not appear as expected. </p> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="utilities-command-line-hbsubset"></a>hb-subset</h3></div></div></div> <p> <span class="emphasis"><em><span class="command"><strong>hb-subset</strong></span></em></span> allows you to generate a subset of a given font, with a limited set of supported characters, features, and variation settings. </p> <p> By default, you provide an input font and an input text string as the arguments to <span class="command"><strong>hb-subset</strong></span>, and it will generate a font that covers the input text exactly like the input font does, but includes no other characters or features. </p> <pre class="programlisting"> <span class="command"><strong>hb-subset</strong></span> [<span class="optional">[OPTIONS]</span>] <em class="parameter"><code>path/to/font/file.ttf</code></em> <em class="parameter"><code>yourinputtext</code></em> </pre> <p> For example, to create a subset of Noto Serif that just includes the numerals and the lowercase Latin alphabet, you could run </p> <pre class="programlisting"> <span class="command"><strong>hb-subset</strong></span> [<span class="optional">[OPTIONS]</span>] <em class="parameter"><code>NotoSerif-Regular.ttf</code></em> <em class="parameter"><code>0123456789abcdefghijklmnopqrstuvwxyz</code></em> </pre> <p> There are options available to remove hinting from the subsetted font and to specify a list of variation-axis settings. </p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>