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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Pango Reference Manual: Modules</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="#pango-Modules.description" class="shortcut">Description</a></span>
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<div class="refentry">
<a name="pango-Modules"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="pango-Modules.top_of_page"></a>Modules</span></h2>
<p>Modules — Support for loadable modules</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="pango-Modules.functions"></a><h2>Functions</h2>
<div class="informaltable"><table 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="pango-Modules.html#PangoMap" title="PangoMap"><span class="returnvalue">PangoMap</span></a> *
</td>
<td class="function_name">
<a class="link" href="pango-Modules.html#pango-find-map" title="pango_find_map ()">pango_find_map</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-Modules.html#pango-map-get-engine" title="pango_map_get_engine ()">pango_map_get_engine</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-Modules.html#pango-map-get-engines" title="pango_map_get_engines ()">pango_map_get_engines</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-Modules.html#pango-module-register" title="pango_module_register ()">pango_module_register</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="pango-Modules.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table 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-Modules.html#PangoIncludedModule" title="struct PangoIncludedModule">PangoIncludedModule</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="pango-Modules.html#PangoMap" title="PangoMap">PangoMap</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="pango-Modules.html#PangoMapEntry" title="PangoMapEntry">PangoMapEntry</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="pango-Modules.description"></a><h2>Description</h2>
<p>Functions and macros in this section are used to support loading dynamic
modules that add engines to Pango at run time.</p>
</div>
<div class="refsect1">
<a name="pango-Modules.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="pango-find-map"></a><h3>pango_find_map ()</h3>
<pre class="programlisting"><a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="returnvalue">PangoMap</span></a> *
pango_find_map (<em class="parameter"><code><a class="link" href="pango-Scripts-and-Languages.html#PangoLanguage"><span class="type">PangoLanguage</span></a> *language</code></em>,
                <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> engine_type_id</code></em>,
                <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> render_type_id</code></em>);</pre>
<p>Locate a <a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="type">PangoMap</span></a> for a particular engine type and render
type. The resulting map can be used to determine the engine
for each character.</p>
<div class="refsect3">
<a name="id-1.4.11.6.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>language</p></td>
<td class="parameter_description"><p>the language tag for which to find the map</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>engine_type_id</p></td>
<td class="parameter_description"><p>the engine type for the map to find</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>render_type_id</p></td>
<td class="parameter_description"><p>the render type for the map to find</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.11.6.2.6"></a><h4>Returns</h4>
<p> the suitable <a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="type">PangoMap</span></a>.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="pango-map-get-engine"></a><h3>pango_map_get_engine ()</h3>
<pre class="programlisting"><a class="link" href="pango-Engines.html#PangoEngine"><span class="returnvalue">PangoEngine</span></a> *
pango_map_get_engine (<em class="parameter"><code><a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="type">PangoMap</span></a> *map</code></em>,
                      <em class="parameter"><code><a class="link" href="pango-Scripts-and-Languages.html#PangoScript" title="enum PangoScript"><span class="type">PangoScript</span></a> script</code></em>);</pre>
<p>Returns the best engine listed in the map for a given script</p>
<div class="refsect3">
<a name="id-1.4.11.6.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>map</p></td>
<td class="parameter_description"><p>a <a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="type">PangoMap</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>a <a class="link" href="pango-Scripts-and-Languages.html#PangoScript" title="enum PangoScript"><span class="type">PangoScript</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.11.6.3.6"></a><h4>Returns</h4>
<p> the best engine, if one is listed for the script,
or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. The lookup may cause the engine to be loaded;
once an engine is loaded, it won't be unloaded. If multiple
engines are exact for the script, the choice of which is
returned is arbitrary.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="pango-map-get-engines"></a><h3>pango_map_get_engines ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
pango_map_get_engines (<em class="parameter"><code><a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="type">PangoMap</span></a> *map</code></em>,
                       <em class="parameter"><code><a class="link" href="pango-Scripts-and-Languages.html#PangoScript" title="enum PangoScript"><span class="type">PangoScript</span></a> script</code></em>,
                       <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> **exact_engines</code></em>,
                       <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> **fallback_engines</code></em>);</pre>
<p>Finds engines in the map that handle the given script. The returned
lists should be freed with g_slist_free, but the engines in the
lists are owned by GLib and will be kept around permanently, so
they should not be unref'ed.</p>
<div class="refsect3">
<a name="id-1.4.11.6.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>map</p></td>
<td class="parameter_description"><p>a <a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="type">PangoMap</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>script</p></td>
<td class="parameter_description"><p>a <a class="link" href="pango-Scripts-and-Languages.html#PangoScript" title="enum PangoScript"><span class="type">PangoScript</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>exact_engines</p></td>
<td class="parameter_description"><p>location to store list of engines that exactly
handle this script.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fallback_engines</p></td>
<td class="parameter_description"><p>location to store list of engines that approximately
handle this script.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="pango-module-register"></a><h3>pango_module_register ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
pango_module_register (<em class="parameter"><code><a class="link" href="pango-Modules.html#PangoIncludedModule" title="struct PangoIncludedModule"><span class="type">PangoIncludedModule</span></a> *module</code></em>);</pre>
<p>Registers a statically linked module with Pango. The
<a class="link" href="pango-Modules.html#PangoIncludedModule" title="struct PangoIncludedModule"><span class="type">PangoIncludedModule</span></a> structure that is passed in contains the
functions that would otherwise be loaded from a dynamically loaded
module.</p>
<div class="refsect3">
<a name="id-1.4.11.6.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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 class="link" href="pango-Modules.html#PangoIncludedModule" title="struct PangoIncludedModule"><span class="type">PangoIncludedModule</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="pango-Modules.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="PangoIncludedModule"></a><h3>struct PangoIncludedModule</h3>
<pre class="programlisting">struct PangoIncludedModule {
  void (*list) (PangoEngineInfo **engines,
		int              *n_engines);
  void (*init) (GTypeModule      *module);
  void (*exit) (void);
  PangoEngine *(*create) (const char       *id);
};
</pre>
<p>The <a class="link" href="pango-Modules.html#PangoIncludedModule" title="struct PangoIncludedModule"><span class="type">PangoIncludedModule</span></a> structure for a statically linked module
contains the functions that would otherwise be loaded from a dynamically
loaded module.</p>
<div class="refsect3">
<a name="id-1.4.11.7.2.5"></a><h4>Members</h4>
<div class="informaltable"><table 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><em class="structfield"><code><a name="PangoIncludedModule.list"></a>list</code></em> ()</p></td>
<td class="struct_member_description"><p>a function that lists the engines defined in this module.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PangoIncludedModule.init"></a>init</code></em> ()</p></td>
<td class="struct_member_description"><p>a function to initialize the module.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PangoIncludedModule.exit"></a>exit</code></em> ()</p></td>
<td class="struct_member_description"><p>a function to finalize the module.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PangoIncludedModule.create"></a>create</code></em> ()</p></td>
<td class="struct_member_description"><p>a function to create an engine, given the engine name.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="PangoMap"></a><h3>PangoMap</h3>
<pre class="programlisting">typedef struct _PangoMap PangoMap;</pre>
<p>A <a class="link" href="pango-Modules.html#PangoMap" title="PangoMap"><span class="type">PangoMap</span></a> structure can be used to determine the engine to
use for each character.</p>
</div>
<hr>
<div class="refsect2">
<a name="PangoMapEntry"></a><h3>PangoMapEntry</h3>
<pre class="programlisting">typedef struct _PangoMapEntry PangoMapEntry;</pre>
<p>A <a class="link" href="pango-Modules.html#PangoMapEntry" title="PangoMapEntry"><span class="type">PangoMapEntry</span></a> contains information about the engine that should be used
for the codepoint to which this entry belongs and also whether the engine
matches the language tag for this entry's map exactly or just approximately.</p>
</div>
</div>
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