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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>Engines: Pango Reference Manual</title>
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<link rel="up" href="lowlevel.html" title="Low Level Functionality">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#pango-Engines.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#pango-Engines.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
</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="lowlevel.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="pango-Coverage-Maps.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="PangoEngineLang.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="pango-Engines"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="pango-Engines.top_of_page"></a>Engines</span></h2>
<p>Engines — Language-specific and rendering-system-specific processing</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="pango-Engines.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">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="pango-Engines.html#script-engine-list" title="script_engine_list ()">script_engine_list</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="pango-Engines.html#script-engine-init" title="script_engine_init ()">script_engine_init</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="pango-Engines.html#script-engine-exit" title="script_engine_exit ()">script_engine_exit</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="pango-Engines.html#PangoEngine"><span class="returnvalue">PangoEngine</span></a> *
</td>
<td class="function_name">
<a class="link" href="pango-Engines.html#script-engine-create" title="script_engine_create ()">script_engine_create</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<a name="PangoEngine"></a><div class="refsect1">
<a name="pango-Engines.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">struct</td>
<td class="function_name"><a class="link" href="pango-Engines.html#PangoEngineInfo" title="struct PangoEngineInfo">PangoEngineInfo</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="pango-Engines.html#PangoEngineScriptInfo" title="struct PangoEngineScriptInfo">PangoEngineScriptInfo</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="pango-Engines.html#PangoEngine-struct" title="struct PangoEngine">PangoEngine</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="pango-Engines.html#PangoEngineClass" title="struct PangoEngineClass">PangoEngineClass</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="pango-Engines.html#PANGO-RENDER-TYPE-NONE:CAPS" title="PANGO_RENDER_TYPE_NONE">PANGO_RENDER_TYPE_NONE</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="pango-Engines.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> PangoEngine
        <span class="lineart">├──</span> <a class="link" href="PangoEngineLang.html" title="PangoEngineLang">PangoEngineLang</a>
        <span class="lineart">╰──</span> <a class="link" href="PangoEngineShape.html" title="PangoEngineShape">PangoEngineShape</a>
</pre>
</div>
<div class="refsect1">
<a name="pango-Engines.description"></a><h2>Description</h2>
<p>Pango utilizes a module architecture in which the language-specific
and render-system-specific components are provided by loadable
modules. Each loadable module supplies one or more
<em class="firstterm">engines</em>.  Each <em class="firstterm">engine</em>
has an associated <em class="firstterm">engine type</em> and
<em class="firstterm">render type</em>. These two types are represented by strings.</p>
<p>Each dynamically-loaded module exports several functions which provide
the public API. These functions are <a class="link" href="pango-Engines.html#script-engine-list" title="script_engine_list ()"><code class="function">script_engine_list()</code></a>,
<a class="link" href="pango-Engines.html#script-engine-init" title="script_engine_init ()"><code class="function">script_engine_init()</code></a> and script_engine_exit, and
<a class="link" href="pango-Engines.html#script-engine-create" title="script_engine_create ()"><code class="function">script_engine_create()</code></a>. The latter three functions are used when
creating engines from the module at run time, while the first
function is used when building a catalog of all available modules.</p>
</div>
<div class="refsect1">
<a name="pango-Engines.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="script-engine-list"></a><h3>script_engine_list ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
script_engine_list (<em class="parameter"><code><a class="link" href="pango-Engines.html#PangoEngineInfo" title="struct PangoEngineInfo"><span class="type">PangoEngineInfo</span></a> **engines</code></em>,
                    <em class="parameter"><code><span class="type">int</span> *n_engines</code></em>);</pre>
<div class="warning"><p><code class="literal">script_engine_list</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>Do not use.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="script-engine-list.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>engines</p></td>
<td class="parameter_description"><p>location to store a pointer to an array of engines.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_engines</p></td>
<td class="parameter_description"><p>location to store the number of elements in <em class="parameter"><code>engines</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="script-engine-init"></a><h3>script_engine_init ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
script_engine_init (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/GTypeModule.html#GTypeModule-struct"><span class="type">GTypeModule</span></a> *module</code></em>);</pre>
<div class="warning"><p><code class="literal">script_engine_init</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>Do not use.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="script-engine-init.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>module</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gobject/GTypeModule.html#GTypeModule-struct"><span class="type">GTypeModule</span></a> structure used to associate any
GObject types created in this module with the module.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="script-engine-exit"></a><h3>script_engine_exit ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
script_engine_exit (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<div class="warning"><p><code class="literal">script_engine_exit</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>Do not use.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="script-engine-create"></a><h3>script_engine_create ()</h3>
<pre class="programlisting"><a class="link" href="pango-Engines.html#PangoEngine"><span class="returnvalue">PangoEngine</span></a> *
script_engine_create (<em class="parameter"><code>const <span class="type">char</span> *id</code></em>);</pre>
<div class="warning"><p><code class="literal">script_engine_create</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>Do not use.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="script-engine-create.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>id</p></td>
<td class="parameter_description"><p>the ID of an engine as reported by script_engine_list.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="pango-Engines.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="PangoEngineInfo"></a><h3>struct PangoEngineInfo</h3>
<pre class="programlisting">struct PangoEngineInfo {
  const gchar *id;
  const gchar *engine_type;
  const gchar *render_type;
  PangoEngineScriptInfo *scripts;
  gint n_scripts;
};
</pre>
<div class="warning"><p><code class="literal">PangoEngineInfo</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>The <a class="link" href="pango-Engines.html#PangoEngineInfo" title="struct PangoEngineInfo"><span class="type">PangoEngineInfo</span></a> structure contains information about a particular
engine. It contains the following fields:</p>
<div class="refsect3">
<a name="PangoEngineInfo.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="PangoEngineInfo.id"></a>id</code></em>;</p></td>
<td class="struct_member_description"><p>a unique string ID for the engine.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="PangoEngineInfo.engine-type"></a>engine_type</code></em>;</p></td>
<td class="struct_member_description"><p>a string identifying the engine type.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="PangoEngineInfo.render-type"></a>render_type</code></em>;</p></td>
<td class="struct_member_description"><p>a string identifying the render type.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="pango-Engines.html#PangoEngineScriptInfo" title="struct PangoEngineScriptInfo"><span class="type">PangoEngineScriptInfo</span></a> *<em class="structfield"><code><a name="PangoEngineInfo.scripts"></a>scripts</code></em>;</p></td>
<td class="struct_member_description"><p>array of scripts this engine supports.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="PangoEngineInfo.n-scripts"></a>n_scripts</code></em>;</p></td>
<td class="struct_member_description"><p>number of items in <em class="parameter"><code>scripts</code></em>
.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="PangoEngineScriptInfo"></a><h3>struct PangoEngineScriptInfo</h3>
<pre class="programlisting">struct PangoEngineScriptInfo {
  PangoScript script;
  const gchar *langs;
};
</pre>
<div class="warning"><p><code class="literal">PangoEngineScriptInfo</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>The <a class="link" href="pango-Engines.html#PangoEngineScriptInfo" title="struct PangoEngineScriptInfo"><span class="type">PangoEngineScriptInfo</span></a> structure contains
information about how the shaper covers a particular script.</p>
<div class="refsect3">
<a name="PangoEngineScriptInfo.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a class="link" href="pango-Scripts-and-Languages.html#PangoScript" title="enum PangoScript"><span class="type">PangoScript</span></a> <em class="structfield"><code><a name="PangoEngineScriptInfo.script"></a>script</code></em>;</p></td>
<td class="struct_member_description"><p>a <a class="link" href="pango-Scripts-and-Languages.html#PangoScript" title="enum PangoScript"><span class="type">PangoScript</span></a>. The value <a class="link" href="pango-Scripts-and-Languages.html#PANGO-SCRIPT-COMMON:CAPS"><code class="literal">PANGO_SCRIPT_COMMON</code></a> has
the special meaning here of "all scripts"</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="PangoEngineScriptInfo.langs"></a>langs</code></em>;</p></td>
<td class="struct_member_description"><p>a semicolon separated list of languages that this
engine handles for this script. This may be empty,
in which case the engine is saying that it is a
fallback choice for all languages for this range,
but should not be used if another engine
indicates that it is specific for the language for
a given code point. An entry in this list of "*"
indicates that this engine is specific to all
languages for this range.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="PangoEngine-struct"></a><h3>struct PangoEngine</h3>
<pre class="programlisting">struct PangoEngine;</pre>
<div class="warning"><p><code class="literal">PangoEngine</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p><a class="link" href="pango-Engines.html#PangoEngine"><span class="type">PangoEngine</span></a> is the base class for all types of language and
script specific engines. It has no functionality by itself.</p>
</div>
<hr>
<div class="refsect2">
<a name="PangoEngineClass"></a><h3>struct PangoEngineClass</h3>
<pre class="programlisting">struct PangoEngineClass {
};
</pre>
<div class="warning"><p><code class="literal">PangoEngineClass</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>Class structure for <a class="link" href="pango-Engines.html#PangoEngine"><span class="type">PangoEngine</span></a></p>
</div>
<hr>
<div class="refsect2">
<a name="PANGO-RENDER-TYPE-NONE:CAPS"></a><h3>PANGO_RENDER_TYPE_NONE</h3>
<pre class="programlisting">#define PANGO_RENDER_TYPE_NONE "PangoRenderNone"
</pre>
<div class="warning"><p><code class="literal">PANGO_RENDER_TYPE_NONE</code> has been deprecated since version 1.38 and should not be used in newly-written code.</p></div>
<p>A string constant defining the render type
for engines that are not rendering-system specific.</p>
</div>
</div>
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