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<h2><span class="refentrytitle"><a name="clutter-gtk-1.0-Utility-Functions.top_of_page"></a>Utility Functions</span></h2>
<p>Utility Functions — Utility functions for integrating Clutter in GTK+</p>
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<div class="refsynopsisdiv">
<a name="clutter-gtk-1.0-Utility-Functions.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"><span class="returnvalue">ClutterInitError</span> <a class="link" href="clutter-gtk-1.0-Utility-Functions.html#gtk-clutter-init" title="gtk_clutter_init ()">gtk_clutter_init</a> (<em class="parameter"><code><span class="type">int</span> *argc</code></em>,
<em class="parameter"><code><span class="type">char</span> ***argv</code></em>);
<span class="returnvalue">ClutterInitError</span> <a class="link" href="clutter-gtk-1.0-Utility-Functions.html#gtk-clutter-init-with-args" title="gtk_clutter_init_with_args ()">gtk_clutter_init_with_args</a> (<em class="parameter"><code><span class="type">int</span> *argc</code></em>,
<em class="parameter"><code><span class="type">char</span> ***argv</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *parameter_string</code></em>,
<em class="parameter"><code><span class="type">GOptionEntry</span> *entries</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *translation_domain</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);
<span class="returnvalue">GOptionGroup</span> * <a class="link" href="clutter-gtk-1.0-Utility-Functions.html#gtk-clutter-get-option-group" title="gtk_clutter_get_option_group ()">gtk_clutter_get_option_group</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
</pre>
</div>
<div class="refsect1">
<a name="clutter-gtk-1.0-Utility-Functions.description"></a><h2>Description</h2>
<p>
In order to properly integrate a Clutter scene into a GTK+ applications
a certain degree of state must be retrieved from GTK+ itself.
</p>
<p>
Clutter-GTK provides API for easing the process of synchronizing colors
with the current GTK+ theme and for loading image sources from <span class="type">GdkPixbuf</span>,
GTK+ stock items and icon themes.
</p>
</div>
<div class="refsect1">
<a name="clutter-gtk-1.0-Utility-Functions.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gtk-clutter-init"></a><h3>gtk_clutter_init ()</h3>
<pre class="programlisting"><span class="returnvalue">ClutterInitError</span> gtk_clutter_init (<em class="parameter"><code><span class="type">int</span> *argc</code></em>,
<em class="parameter"><code><span class="type">char</span> ***argv</code></em>);</pre>
<p>
This function should be called instead of <code class="function">clutter_init()</code> and
<code class="function">gtk_init()</code>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>argc</code></em> :</span></p></td>
<td>pointer to the arguments count, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>argv</code></em> :</span></p></td>
<td>pointer to the
arguments vector, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=argc][<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">CLUTTER_INIT_SUCCESS</code> on success, a negative integer
on failure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gtk-clutter-init-with-args"></a><h3>gtk_clutter_init_with_args ()</h3>
<pre class="programlisting"><span class="returnvalue">ClutterInitError</span> gtk_clutter_init_with_args (<em class="parameter"><code><span class="type">int</span> *argc</code></em>,
<em class="parameter"><code><span class="type">char</span> ***argv</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *parameter_string</code></em>,
<em class="parameter"><code><span class="type">GOptionEntry</span> *entries</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *translation_domain</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
This function should be called instead of <code class="function">clutter_init()</code> and
<code class="function">gtk_init_with_args()</code>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>argc</code></em> :</span></p></td>
<td>a pointer to the number of command line
arguments, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>argv</code></em> :</span></p></td>
<td>a pointer to the array
of command line arguments, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=argc]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>parameter_string</code></em> :</span></p></td>
<td>a string which is displayed in
the first line of <code class="option">--help</code> output, after
<code class="literal"><em class="replaceable"><code>programname</code></em> [OPTION...]</code>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>entries</code></em> :</span></p></td>
<td>a
<code class="literal">NULL</code>-terminated array of <span class="type">GOptionEntry</span>s describing the
options of your program. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>translation_domain</code></em> :</span></p></td>
<td>a translation domain to use for
translating the <code class="option">--help</code> output for the options
in <em class="parameter"><code>entries</code></em> with <code class="function">gettext()</code>, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>a return location for errors, or <code class="literal">NULL</code>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">CLUTTER_INIT_SUCCESS</code> on success, a negative integer
on failure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gtk-clutter-get-option-group"></a><h3>gtk_clutter_get_option_group ()</h3>
<pre class="programlisting"><span class="returnvalue">GOptionGroup</span> * gtk_clutter_get_option_group (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Returns a <span class="type">GOptionGroup</span> for the command line arguments recognized
by Clutter. You should add this group to your <span class="type">GOptionContext</span> with
<code class="function">g_option_context_add_group()</code>, if you are using <code class="function">g_option_context_parse()</code>
to parse your commandline arguments instead of using <a class="link" href="clutter-gtk-1.0-Utility-Functions.html#gtk-clutter-init" title="gtk_clutter_init ()"><code class="function">gtk_clutter_init()</code></a>
or <a class="link" href="clutter-gtk-1.0-Utility-Functions.html#gtk-clutter-init-with-args" title="gtk_clutter_init_with_args ()"><code class="function">gtk_clutter_init_with_args()</code></a>.
</p>
<p>
You should add this option group to your <span class="type">GOptionContext</span> after
the GTK option group created with <code class="function">gtk_get_option_group()</code>, and after
the clutter option group obtained from <code class="function">clutter_get_option_group_without_init()</code>.
You should not use <code class="function">clutter_get_option_group()</code> together with this function.
</p>
<p>
You must pass <code class="literal">TRUE</code> to <code class="function">gtk_get_option_group()</code> since gtk-clutter's option
group relies on it.
</p>
<p>
Parsing options using <code class="function">g_option_context_parse()</code> with a <span class="type">GOptionContext</span>
containing the returned <span class="type">GOptionGroupwith</span> will result in Clutter's and
GTK-Clutter's initialisation. That is, the following code:
</p>
<p>
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function">g_option_context_add_group</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">,</span><span class="normal"> </span><span class="function">gtk_get_option_group</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">TRUE</span><span class="symbol">));</span>
<span class="function">g_option_context_add_group</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">,</span><span class="normal"> </span><span class="function">cogl_get_option_group</span><span class="normal"> </span><span class="symbol">());</span>
<span class="function">g_option_context_add_group</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">,</span><span class="normal"> </span><span class="function">clutter_get_option_group_without_init</span><span class="normal"> </span><span class="symbol">());</span>
<span class="function">g_option_context_add_group</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">,</span><span class="normal"> </span><span class="function"><a href="clutter-gtk-1.0-Utility-Functions.html#gtk-clutter-get-option-group">gtk_clutter_get_option_group</a></span><span class="normal"> </span><span class="symbol">());</span>
<span class="normal">res </span><span class="symbol">=</span><span class="normal"> </span><span class="function">g_option_context_parse</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> NULL</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
is functionally equivalent to:
</p>
<p>
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="clutter-gtk-1.0-Utility-Functions.html#gtk-clutter-init">gtk_clutter_init</a></span><span class="normal"> </span><span class="symbol">(&</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">argv</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
After <code class="function">g_option_context_parse()</code> on a <span class="type">GOptionContext</span> containing the
the returned <span class="type">GOptionGroup</span> has returned <code class="literal">TRUE</code>, Clutter and GTK-Clutter are
guaranteed to be initialized.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <span class="type">GOptionGroup</span> for the commandline arguments
recognized by ClutterGtk. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr></tbody>
</table></div>
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