350 lines
18 KiB
HTML
350 lines
18 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Shaping: HarfBuzz Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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<link rel="home" href="index.html" title="HarfBuzz Manual">
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<link rel="up" href="ch07.html" title="Harfbuzz API">
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<link rel="prev" href="harfbuzz-hb-font.html" title="hb-font">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
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<td width="100%" align="left" class="shortcuts">
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<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
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<a href="#harfbuzz-Shaping.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span>
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<a href="#harfbuzz-Shaping.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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</td>
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<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
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<td><a accesskey="p" href="harfbuzz-hb-font.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
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<td><a accesskey="n" href="harfbuzz-hb-version.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
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</tr></table>
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<div class="refentry">
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<a name="harfbuzz-Shaping"></a><div class="titlepage"></div>
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<div class="refnamediv"><table width="100%"><tr>
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<td valign="top">
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<h2><span class="refentrytitle"><a name="harfbuzz-Shaping.top_of_page"></a>Shaping</span></h2>
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<p>Shaping — Conversion of text strings into positioned glyphs</p>
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</td>
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<td class="gallery_image" valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsect1">
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<a name="harfbuzz-Shaping.functions"></a><h2>Functions</h2>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="functions_return">
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<col class="functions_name">
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</colgroup>
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<tbody>
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<tr>
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<td class="function_type">
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<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
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</td>
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<td class="function_name">
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<a class="link" href="harfbuzz-Shaping.html#hb-feature-from-string" title="hb_feature_from_string ()">hb_feature_from_string</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">void</span>
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</td>
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<td class="function_name">
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<a class="link" href="harfbuzz-Shaping.html#hb-feature-to-string" title="hb_feature_to_string ()">hb_feature_to_string</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">void</span>
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</td>
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<td class="function_name">
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<a class="link" href="harfbuzz-Shaping.html#hb-shape" title="hb_shape ()">hb_shape</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
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</td>
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<td class="function_name">
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<a class="link" href="harfbuzz-Shaping.html#hb-shape-full" title="hb_shape_full ()">hb_shape_full</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">const <span class="returnvalue">char</span> **
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</td>
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<td class="function_name">
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<a class="link" href="harfbuzz-Shaping.html#hb-shape-list-shapers" title="hb_shape_list_shapers ()">hb_shape_list_shapers</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<a name="hb-feature-t"></a><div class="refsect1">
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<a name="harfbuzz-Shaping.other"></a><h2>Types and Values</h2>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="name">
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<col class="description">
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</colgroup>
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<tbody><tr>
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<td class="datatype_keyword"> </td>
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<td class="function_name"><a class="link" href="harfbuzz-Shaping.html#hb-feature-t-struct" title="hb_feature_t">hb_feature_t</a></td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect1">
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<a name="harfbuzz-Shaping.object-hierarchy"></a><h2>Object Hierarchy</h2>
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<pre class="screen"> <a href="/home/behdad/.local/share/gtk-doc/html/gobject/gobject-Boxed-Types.html">GBoxed</a>
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<span class="lineart">╰──</span> hb_feature_t
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</pre>
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</div>
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<div class="refsect1">
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<a name="harfbuzz-Shaping.includes"></a><h2>Includes</h2>
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<pre class="synopsis">#include <hb.h>
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</pre>
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</div>
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<div class="refsect1">
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<a name="harfbuzz-Shaping.description"></a><h2>Description</h2>
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<p>Shaping is the central operation of HarfBuzz. Shaping operates on buffers,
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which are sequences of Unicode characters that use the same font and have
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the same text direction, script and language. After shaping the buffer
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contains the output glyphs and their positions.</p>
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</div>
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<div class="refsect1">
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<a name="harfbuzz-Shaping.functions_details"></a><h2>Functions</h2>
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<div class="refsect2">
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<a name="hb-feature-from-string"></a><h3>hb_feature_from_string ()</h3>
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<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
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hb_feature_from_string (<em class="parameter"><code>const <span class="type">char</span> *str</code></em>,
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<em class="parameter"><code><span class="type">int</span> len</code></em>,
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<em class="parameter"><code><a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> *feature</code></em>);</pre>
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<p>Parses a string into a <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a>.</p>
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<p>TODO: document the syntax here.</p>
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<div class="refsect3">
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<a name="id-1.3.3.9.9.2.6"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>str</p></td>
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<td class="parameter_description"><p> a string to parse. </p></td>
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<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=len][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> uint8_t]</span></td>
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</tr>
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<tr>
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<td class="parameter_name"><p>len</p></td>
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<td class="parameter_description"><p>length of <em class="parameter"><code>str</code></em>
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, or -1 if string is <code class="literal">NULL</code> terminated</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>feature</p></td>
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<td class="parameter_description"><p> the <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> to initialize with the parsed values. </p></td>
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<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.3.3.9.9.2.7"></a><h4>Returns</h4>
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<p><code class="literal">true</code> if <em class="parameter"><code>str</code></em>
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is successfully parsed, <code class="literal">false</code> otherwise.</p>
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<p></p>
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</div>
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<p class="since">Since 0.9.5</p>
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</div>
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<hr>
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<div class="refsect2">
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<a name="hb-feature-to-string"></a><h3>hb_feature_to_string ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span>
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hb_feature_to_string (<em class="parameter"><code><a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> *feature</code></em>,
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<em class="parameter"><code><span class="type">char</span> *buf</code></em>,
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<em class="parameter"><code>unsigned <span class="type">int</span> size</code></em>);</pre>
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<p>Converts a <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> into a <code class="literal">NULL</code>-terminated string in the format
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understood by <a class="link" href="harfbuzz-Shaping.html#hb-feature-from-string" title="hb_feature_from_string ()"><code class="function">hb_feature_from_string()</code></a>. The client in responsible for
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allocating big enough size for <em class="parameter"><code>buf</code></em>
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, 128 bytes is more than enough.</p>
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<div class="refsect3">
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<a name="id-1.3.3.9.9.3.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>feature</p></td>
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<td class="parameter_description"><p>an <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> to convert</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>buf</p></td>
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<td class="parameter_description"><p> output string. </p></td>
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<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
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</tr>
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<tr>
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<td class="parameter_name"><p>size</p></td>
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<td class="parameter_description"><p>the allocated size of <em class="parameter"><code>buf</code></em>
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</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<p class="since">Since 0.9.5</p>
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</div>
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<hr>
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<div class="refsect2">
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<a name="hb-shape"></a><h3>hb_shape ()</h3>
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<pre class="programlisting"><span class="returnvalue">void</span>
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hb_shape (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t"><span class="type">hb_font_t</span></a> *font</code></em>,
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<em class="parameter"><code><a class="link" href="harfbuzz-Buffers.html#hb-buffer-t"><span class="type">hb_buffer_t</span></a> *buffer</code></em>,
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<em class="parameter"><code>const <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> *features</code></em>,
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<em class="parameter"><code>unsigned <span class="type">int</span> num_features</code></em>);</pre>
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<p>Shapes <em class="parameter"><code>buffer</code></em>
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using <em class="parameter"><code>font</code></em>
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turning its Unicode characters content to
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positioned glyphs. If <em class="parameter"><code>features</code></em>
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is not <code class="literal">NULL</code>, it will be used to control the
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features applied during shaping.</p>
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<div class="refsect3">
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<a name="id-1.3.3.9.9.4.5"></a><h4>Parameters</h4>
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<div class="informaltable"><table width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>font</p></td>
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<td class="parameter_description"><p>an <a class="link" href="harfbuzz-hb-font.html#hb-font-t"><span class="type">hb_font_t</span></a> to use for shaping</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>buffer</p></td>
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<td class="parameter_description"><p>an <a class="link" href="harfbuzz-Buffers.html#hb-buffer-t"><span class="type">hb_buffer_t</span></a> to shape</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>features</p></td>
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<td class="parameter_description"><p> an array of user
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specified <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> or <code class="literal">NULL</code>. </p></td>
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<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=num_features][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
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</tr>
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<tr>
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<td class="parameter_name"><p>num_features</p></td>
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<td class="parameter_description"><p>the length of <em class="parameter"><code>features</code></em>
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array</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.3.3.9.9.4.6"></a><h4>Returns</h4>
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<p> <code class="literal">FALSE</code> if all shapers failed, <code class="literal">TRUE</code> otherwise</p>
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<p></p>
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</div>
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<p class="since">Since 0.9.2</p>
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</div>
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<hr>
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<div class="refsect2">
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<a name="hb-shape-full"></a><h3>hb_shape_full ()</h3>
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<pre class="programlisting"><a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
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hb_shape_full (<em class="parameter"><code><a class="link" href="harfbuzz-hb-font.html#hb-font-t"><span class="type">hb_font_t</span></a> *font</code></em>,
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<em class="parameter"><code><a class="link" href="harfbuzz-Buffers.html#hb-buffer-t"><span class="type">hb_buffer_t</span></a> *buffer</code></em>,
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<em class="parameter"><code>const <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> *features</code></em>,
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<em class="parameter"><code>unsigned <span class="type">int</span> num_features</code></em>,
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<em class="parameter"><code>const <span class="type">char</span> * const *shaper_list</code></em>);</pre>
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<p>See <a class="link" href="harfbuzz-Shaping.html#hb-shape" title="hb_shape ()"><code class="function">hb_shape()</code></a> for details. If <em class="parameter"><code>shaper_list</code></em>
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is not <code class="literal">NULL</code>, the specified
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shapers will be used in the given order, otherwise the default shapers list
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will be used.</p>
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<div class="refsect3">
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<a name="id-1.3.3.9.9.5.5"></a><h4>Parameters</h4>
|
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<div class="informaltable"><table width="100%" border="0">
|
||
<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody>
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<tr>
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<td class="parameter_name"><p>font</p></td>
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<td class="parameter_description"><p>an <a class="link" href="harfbuzz-hb-font.html#hb-font-t"><span class="type">hb_font_t</span></a> to use for shaping</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>buffer</p></td>
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<td class="parameter_description"><p>an <a class="link" href="harfbuzz-Buffers.html#hb-buffer-t"><span class="type">hb_buffer_t</span></a> to shape</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>features</p></td>
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<td class="parameter_description"><p> an array of user
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specified <a class="link" href="harfbuzz-Shaping.html#hb-feature-t"><span class="type">hb_feature_t</span></a> or <code class="literal">NULL</code>. </p></td>
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<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=num_features][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
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</tr>
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<tr>
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<td class="parameter_name"><p>num_features</p></td>
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<td class="parameter_description"><p>the length of <em class="parameter"><code>features</code></em>
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array</p></td>
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<td class="parameter_annotations"> </td>
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</tr>
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<tr>
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<td class="parameter_name"><p>shaper_list</p></td>
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<td class="parameter_description"><p> a <code class="literal">NULL</code>-terminated
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array of shapers to use or <code class="literal">NULL</code>. </p></td>
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<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="id-1.3.3.9.9.5.6"></a><h4>Returns</h4>
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<p> <code class="literal">FALSE</code> if all shapers failed, <code class="literal">TRUE</code> otherwise</p>
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<p></p>
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</div>
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<p class="since">Since 0.9.2</p>
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</div>
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<hr>
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<div class="refsect2">
|
||
<a name="hb-shape-list-shapers"></a><h3>hb_shape_list_shapers ()</h3>
|
||
<pre class="programlisting">const <span class="returnvalue">char</span> **
|
||
hb_shape_list_shapers (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
|
||
<p>Retrieves the list of shapers supported by HarfBuzz.</p>
|
||
<div class="refsect3">
|
||
<a name="id-1.3.3.9.9.6.5"></a><h4>Returns</h4>
|
||
<p> an array of
|
||
constant strings. </p>
|
||
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></p>
|
||
</div>
|
||
<p class="since">Since 0.9.2</p>
|
||
</div>
|
||
</div>
|
||
<div class="refsect1">
|
||
<a name="harfbuzz-Shaping.other_details"></a><h2>Types and Values</h2>
|
||
<div class="refsect2">
|
||
<a name="hb-feature-t-struct"></a><h3>hb_feature_t</h3>
|
||
<pre class="programlisting">typedef struct {
|
||
hb_tag_t tag;
|
||
uint32_t value;
|
||
unsigned int start;
|
||
unsigned int end;
|
||
} hb_feature_t;
|
||
</pre>
|
||
</div>
|
||
</div>
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