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<div class="refentry">
<a name="cairo-XLib-Surfaces"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cairo-XLib-Surfaces.top_of_page"></a>XLib Surfaces</span></h2>
<p>XLib Surfaces — X Window System rendering using XLib</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="cairo-XLib-Surfaces.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define <a class="link" href="cairo-XLib-Surfaces.html#CAIRO-HAS-XLIB-SURFACE:CAPS" title="CAIRO_HAS_XLIB_SURFACE">CAIRO_HAS_XLIB_SURFACE</a>
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-create" title="cairo_xlib_surface_create ()">cairo_xlib_surface_create</a> (<em class="parameter"><code><span class="type">Display</span> *dpy</code></em>,
<em class="parameter"><code><span class="type">Drawable</span> drawable</code></em>,
<em class="parameter"><code><span class="type">Visual</span> *visual</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-create-for-bitmap" title="cairo_xlib_surface_create_for_bitmap ()">cairo_xlib_surface_create_for_bitmap</a>
(<em class="parameter"><code><span class="type">Display</span> *dpy</code></em>,
<em class="parameter"><code><span class="type">Pixmap</span> bitmap</code></em>,
<em class="parameter"><code><span class="type">Screen</span> *screen</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-set-size" title="cairo_xlib_surface_set_size ()">cairo_xlib_surface_set_size</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);
<span class="returnvalue">Display</span> * <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-get-display" title="cairo_xlib_surface_get_display ()">cairo_xlib_surface_get_display</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<span class="returnvalue">Screen</span> * <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-get-screen" title="cairo_xlib_surface_get_screen ()">cairo_xlib_surface_get_screen</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-set-drawable" title="cairo_xlib_surface_set_drawable ()">cairo_xlib_surface_set_drawable</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">Drawable</span> drawable</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);
<span class="returnvalue">Drawable</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-get-drawable" title="cairo_xlib_surface_get_drawable ()">cairo_xlib_surface_get_drawable</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<span class="returnvalue">Visual</span> * <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-get-visual" title="cairo_xlib_surface_get_visual ()">cairo_xlib_surface_get_visual</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<span class="returnvalue">int</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-get-width" title="cairo_xlib_surface_get_width ()">cairo_xlib_surface_get_width</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<span class="returnvalue">int</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-get-height" title="cairo_xlib_surface_get_height ()">cairo_xlib_surface_get_height</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<span class="returnvalue">int</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-get-depth" title="cairo_xlib_surface_get_depth ()">cairo_xlib_surface_get_depth</a> (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-device-debug-cap-xrender-version" title="cairo_xlib_device_debug_cap_xrender_version ()">cairo_xlib_device_debug_cap_xrender_version</a>
(<em class="parameter"><code><a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> *device</code></em>,
<em class="parameter"><code><span class="type">int</span> major_version</code></em>,
<em class="parameter"><code><span class="type">int</span> minor_version</code></em>);
<span class="returnvalue">int</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-device-debug-get-precision" title="cairo_xlib_device_debug_get_precision ()">cairo_xlib_device_debug_get_precision</a>
(<em class="parameter"><code><a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> *device</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-device-debug-set-precision" title="cairo_xlib_device_debug_set_precision ()">cairo_xlib_device_debug_set_precision</a>
(<em class="parameter"><code><a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> *device</code></em>,
<em class="parameter"><code><span class="type">int</span> precision</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="cairo-XLib-Surfaces.description"></a><h2>Description</h2>
<p>
The XLib surface is used to render cairo graphics to X Window System
windows and pixmaps using the XLib library.
</p>
<p>
Note that the XLib surface automatically takes advantage of X render extension
if it is available.
</p>
</div>
<div class="refsect1">
<a name="cairo-XLib-Surfaces.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CAIRO-HAS-XLIB-SURFACE:CAPS"></a><h3>CAIRO_HAS_XLIB_SURFACE</h3>
<pre class="programlisting">#define CAIRO_HAS_XLIB_SURFACE 1
</pre>
<p>
Defined if the Xlib surface backend is available.
This macro can be used to conditionally compile backend-specific code.
</p>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-create"></a><h3>cairo_xlib_surface_create ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * cairo_xlib_surface_create (<em class="parameter"><code><span class="type">Display</span> *dpy</code></em>,
<em class="parameter"><code><span class="type">Drawable</span> drawable</code></em>,
<em class="parameter"><code><span class="type">Visual</span> *visual</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);</pre>
<p>
Creates an Xlib surface that draws to the given drawable.
The way that colors are represented in the drawable is specified
by the provided visual.
</p>
<p>
Note: If <em class="parameter"><code>drawable</code></em> is a Window, then the function
<a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-set-size" title="cairo_xlib_surface_set_size ()"><code class="function">cairo_xlib_surface_set_size()</code></a> must be called whenever the size of the
window changes.
</p>
<p>
When <em class="parameter"><code>drawable</code></em> is a Window containing child windows then drawing to
the created surface will be clipped by those child windows. When
the created surface is used as a source, the contents of the
children will be included.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dpy</code></em> :</span></p></td>
<td>an X Display</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>drawable</code></em> :</span></p></td>
<td>an X Drawable, (a Pixmap or a Window)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>visual</code></em> :</span></p></td>
<td>the visual to use for drawing to <em class="parameter"><code>drawable</code></em>. The depth
of the visual must match the depth of the drawable.
Currently, only TrueColor visuals are fully supported.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the current width of <em class="parameter"><code>drawable</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the current height of <em class="parameter"><code>drawable</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the newly created surface</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-create-for-bitmap"></a><h3>cairo_xlib_surface_create_for_bitmap ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * cairo_xlib_surface_create_for_bitmap
(<em class="parameter"><code><span class="type">Display</span> *dpy</code></em>,
<em class="parameter"><code><span class="type">Pixmap</span> bitmap</code></em>,
<em class="parameter"><code><span class="type">Screen</span> *screen</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);</pre>
<p>
Creates an Xlib surface that draws to the given bitmap.
This will be drawn to as a <a class="link" href="cairo-Image-Surfaces.html#CAIRO-FORMAT-A1:CAPS"><code class="literal">CAIRO_FORMAT_A1</code></a> object.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dpy</code></em> :</span></p></td>
<td>an X Display</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bitmap</code></em> :</span></p></td>
<td>an X Drawable, (a depth-1 Pixmap)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>screen</code></em> :</span></p></td>
<td>the X Screen associated with <em class="parameter"><code>bitmap</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the current width of <em class="parameter"><code>bitmap</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the current height of <em class="parameter"><code>bitmap</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the newly created surface</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-set-size"></a><h3>cairo_xlib_surface_set_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xlib_surface_set_size (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);</pre>
<p>
Informs cairo of the new size of the X Drawable underlying the
surface. For a surface created for a Window (rather than a Pixmap),
this function must be called each time the size of the window
changes. (For a subwindow, you are normally resizing the window
yourself, but for a toplevel window, it is necessary to listen for
ConfigureNotify events.)
</p>
<p>
A Pixmap can never change size, so it is never necessary to call
this function on a surface created for a Pixmap.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> for the XLib backend</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the new width of the surface</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the new height of the surface</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-get-display"></a><h3>cairo_xlib_surface_get_display ()</h3>
<pre class="programlisting"><span class="returnvalue">Display</span> * cairo_xlib_surface_get_display (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>
Get the X Display for the underlying X Drawable.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <span class="type">cairo_xlib_surface_t</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the display.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-get-screen"></a><h3>cairo_xlib_surface_get_screen ()</h3>
<pre class="programlisting"><span class="returnvalue">Screen</span> * cairo_xlib_surface_get_screen (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>
Get the X Screen for the underlying X Drawable.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <span class="type">cairo_xlib_surface_t</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the screen.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-set-drawable"></a><h3>cairo_xlib_surface_set_drawable ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xlib_surface_set_drawable (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>,
<em class="parameter"><code><span class="type">Drawable</span> drawable</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);</pre>
<p>
Informs cairo of a new X Drawable underlying the
surface. The drawable must match the display, screen
and format of the existing drawable or the application
will get X protocol errors and will probably terminate.
No checks are done by this function to ensure this
compatibility.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> for the XLib backend</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>drawable</code></em> :</span></p></td>
<td>the new drawable for the surface</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>the width of the new drawable</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>the height of the new drawable</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-get-drawable"></a><h3>cairo_xlib_surface_get_drawable ()</h3>
<pre class="programlisting"><span class="returnvalue">Drawable</span> cairo_xlib_surface_get_drawable (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>
Get the underlying X Drawable used for the surface.
</p>
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<col align="left" valign="top">
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</colgroup>
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<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <span class="type">cairo_xlib_surface_t</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the drawable.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-get-visual"></a><h3>cairo_xlib_surface_get_visual ()</h3>
<pre class="programlisting"><span class="returnvalue">Visual</span> * cairo_xlib_surface_get_visual (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>
Gets the X Visual associated with <em class="parameter"><code>surface</code></em>, suitable for use with the
underlying X Drawable. If <em class="parameter"><code>surface</code></em> was created by
<a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-create" title="cairo_xlib_surface_create ()"><code class="function">cairo_xlib_surface_create()</code></a>, the return value is the Visual passed to that
constructor.
</p>
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<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <span class="type">cairo_xlib_surface_t</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the Visual or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if there is no appropriate Visual for
<em class="parameter"><code>surface</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-get-width"></a><h3>cairo_xlib_surface_get_width ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> cairo_xlib_surface_get_width (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>
Get the width of the X Drawable underlying the surface in pixels.
</p>
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <span class="type">cairo_xlib_surface_t</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the width of the surface in pixels.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-get-height"></a><h3>cairo_xlib_surface_get_height ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> cairo_xlib_surface_get_height (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>
Get the height of the X Drawable underlying the surface in pixels.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
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</colgroup>
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<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <span class="type">cairo_xlib_surface_t</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the height of the surface in pixels.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-get-depth"></a><h3>cairo_xlib_surface_get_depth ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> cairo_xlib_surface_get_depth (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>
Get the number of bits used to represent each pixel value.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
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<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>a <span class="type">cairo_xlib_surface_t</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the depth of the surface in bits.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-device-debug-cap-xrender-version"></a><h3>cairo_xlib_device_debug_cap_xrender_version ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xlib_device_debug_cap_xrender_version
(<em class="parameter"><code><a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> *device</code></em>,
<em class="parameter"><code><span class="type">int</span> major_version</code></em>,
<em class="parameter"><code><span class="type">int</span> minor_version</code></em>);</pre>
<p>
Restricts all future Xlib surfaces for this devices to the specified version
of the RENDER extension. This function exists solely for debugging purpose.
It let's you find out how cairo would behave with an older version of
the RENDER extension.
</p>
<p>
Use the special values -1 and -1 for disabling the RENDER extension.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>device</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> for the Xlib backend</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>major_version</code></em> :</span></p></td>
<td>major version to restrict to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>minor_version</code></em> :</span></p></td>
<td>minor version to restrict to</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-device-debug-get-precision"></a><h3>cairo_xlib_device_debug_get_precision ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> cairo_xlib_device_debug_get_precision
(<em class="parameter"><code><a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> *device</code></em>);</pre>
<p>
Get the Xrender precision mode.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>device</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> for the Xlib backend</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the render precision mode</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-device-debug-set-precision"></a><h3>cairo_xlib_device_debug_set_precision ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xlib_device_debug_set_precision
(<em class="parameter"><code><a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> *device</code></em>,
<em class="parameter"><code><span class="type">int</span> precision</code></em>);</pre>
<p>
Render supports two modes of precision when rendering trapezoids. Set
the precision to the desired mode.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
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</colgroup>
<tbody>
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<td><p><span class="term"><em class="parameter"><code>device</code></em> :</span></p></td>
<td>a <a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a> for the Xlib backend</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>precision</code></em> :</span></p></td>
<td>the precision to use</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.12</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-XLib-Surfaces.see-also"></a><h2>See Also</h2>
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a>
</div>
</div>
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