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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
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<title>Shaping: HarfBuzz Manual</title>
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<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#harfbuzz-Shaping.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#harfbuzz-Shaping.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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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>
<td><a accesskey="u" href="ch08.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
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</tr></table>
<div class="refentry">
<a name="harfbuzz-Shaping"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="harfbuzz-Shaping.top_of_page"></a>Shaping</span></h2>
<p>Shaping — Conversion of text strings into positioned glyphs</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="harfbuzz-Shaping.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<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>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-Shaping.html#hb-shape" title="hb_shape ()">hb_shape</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="harfbuzz-hb-common.html#hb-bool-t" title="hb_bool_t"><span class="returnvalue">hb_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="harfbuzz-Shaping.html#hb-shape-full" title="hb_shape_full ()">hb_shape_full</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> **
</td>
<td class="function_name">
<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>
</td>
</tr>
</tbody>
</table></div>
</div>
<a name="hb-feature-t"></a><div class="refsect1">
<a name="harfbuzz-Shaping.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="harfbuzz-Shaping.html#hb-feature-t-struct" title="hb_feature_t">hb_feature_t</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="harfbuzz-Shaping.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    GBoxed
    <span class="lineart">╰──</span> hb_feature_t
</pre>
</div>
<div class="refsect1">
<a name="harfbuzz-Shaping.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;hb.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="harfbuzz-Shaping.description"></a><h2>Description</h2>
<p>Shaping is the central operation of HarfBuzz. Shaping operates on buffers,
which are sequences of Unicode characters that use the same font and have
the same text direction, script and language. After shaping the buffer
contains the output glyphs and their positions.</p>
</div>
<div class="refsect1">
<a name="harfbuzz-Shaping.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="hb-feature-from-string"></a><h3>hb_feature_from_string ()</h3>
<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>
hb_feature_from_string (<em class="parameter"><code>const <span class="type">char</span> *str</code></em>,
                        <em class="parameter"><code><span class="type">int</span> len</code></em>,
                        <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>
<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>
<p>TODO: document the syntax here.</p>
<div class="refsect3">
<a name="hb-feature-from-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>str</p></td>
<td class="parameter_description"><p>a string to parse. </p></td>
<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>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>length of <em class="parameter"><code>str</code></em>
, or -1 if string is <code class="literal">NULL</code> terminated</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>feature</p></td>
<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>
<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>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-feature-from-string.returns"></a><h4>Returns</h4>
<p><code class="literal">true</code> if <em class="parameter"><code>str</code></em>
is successfully parsed, <code class="literal">false</code> otherwise.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-5.html#api-index-0.9.5">0.9.5</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-feature-to-string"></a><h3>hb_feature_to_string ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
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>,
                      <em class="parameter"><code><span class="type">char</span> *buf</code></em>,
                      <em class="parameter"><code>unsigned <span class="type">int</span> size</code></em>);</pre>
<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
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
allocating big enough size for <em class="parameter"><code>buf</code></em>
, 128 bytes is more than enough.</p>
<div class="refsect3">
<a name="hb-feature-to-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>feature</p></td>
<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>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>output string. </p></td>
<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>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>the allocated size of <em class="parameter"><code>buf</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-5.html#api-index-0.9.5">0.9.5</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-shape"></a><h3>hb_shape ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
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>,
          <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>,
          <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>,
          <em class="parameter"><code>unsigned <span class="type">int</span> num_features</code></em>);</pre>
<p>Shapes <em class="parameter"><code>buffer</code></em>
 using <em class="parameter"><code>font</code></em>
 turning its Unicode characters content to
positioned glyphs. If <em class="parameter"><code>features</code></em>
 is not <code class="literal">NULL</code>, it will be used to control the
features applied during shaping.</p>
<div class="refsect3">
<a name="hb-shape.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<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>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<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>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>features</p></td>
<td class="parameter_description"><p>an array of user
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>
<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>
</tr>
<tr>
<td class="parameter_name"><p>num_features</p></td>
<td class="parameter_description"><p>the length of <em class="parameter"><code>features</code></em>
array</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="hb-shape-full"></a><h3>hb_shape_full ()</h3>
<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>
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>,
               <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>,
               <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>,
               <em class="parameter"><code>unsigned <span class="type">int</span> num_features</code></em>,
               <em class="parameter"><code>const <span class="type">char</span> * const *shaper_list</code></em>);</pre>
<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>
 is not <code class="literal">NULL</code>, the specified
shapers will be used in the given order, otherwise the default shapers list
will be used.</p>
<div class="refsect3">
<a name="hb-shape-full.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>font</p></td>
<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>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<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>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>features</p></td>
<td class="parameter_description"><p>an array of user
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>
<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>
</tr>
<tr>
<td class="parameter_name"><p>num_features</p></td>
<td class="parameter_description"><p>the length of <em class="parameter"><code>features</code></em>
array</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>shaper_list</p></td>
<td class="parameter_description"><p>a <code class="literal">NULL</code>-terminated
array of shapers to use or <code class="literal">NULL</code>. </p></td>
<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>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="hb-shape-full.returns"></a><h4>Returns</h4>
<p> false if all shapers failed, true otherwise</p>
</div>
<p class="since">Since: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></p>
</div>
<hr>
<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="hb-shape-list-shapers.returns"></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: <a class="link" href="api-index-0-9-2.html#api-index-0.9.2">0.9.2</a></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>
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