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<div class="refentry">
<a name="cairo-XCB-Surfaces"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
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<h2><span class="refentrytitle"><a name="cairo-XCB-Surfaces.top_of_page"></a>XCB Surfaces</span></h2>
<p>XCB Surfaces — X Window System rendering using the XCB library</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="cairo-XCB-Surfaces.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define <a class="link" href="cairo-XCB-Surfaces.html#CAIRO-HAS-XCB-SURFACE:CAPS" title="CAIRO_HAS_XCB_SURFACE">CAIRO_HAS_XCB_SURFACE</a>
#define <a class="link" href="cairo-XCB-Surfaces.html#CAIRO-HAS-XCB-SHM-FUNCTIONS:CAPS" title="CAIRO_HAS_XCB_SHM_FUNCTIONS">CAIRO_HAS_XCB_SHM_FUNCTIONS</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-XCB-Surfaces.html#cairo-xcb-surface-create" title="cairo_xcb_surface_create ()">cairo_xcb_surface_create</a> (<em class="parameter"><code><span class="type">xcb_connection_t</span> *connection</code></em>,
<em class="parameter"><code><span class="type">xcb_drawable_t</span> drawable</code></em>,
<em class="parameter"><code><span class="type">xcb_visualtype_t</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-XCB-Surfaces.html#cairo-xcb-surface-create-for-bitmap" title="cairo_xcb_surface_create_for_bitmap ()">cairo_xcb_surface_create_for_bitmap</a> (<em class="parameter"><code><span class="type">xcb_connection_t</span> *connection</code></em>,
<em class="parameter"><code><span class="type">xcb_screen_t</span> *screen</code></em>,
<em class="parameter"><code><span class="type">xcb_pixmap_t</span> bitmap</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-XCB-Surfaces.html#cairo-xcb-surface-create-with-xrender-format" title="cairo_xcb_surface_create_with_xrender_format ()">cairo_xcb_surface_create_with_xrender_format</a>
(<em class="parameter"><code><span class="type">xcb_connection_t</span> *connection</code></em>,
<em class="parameter"><code><span class="type">xcb_screen_t</span> *screen</code></em>,
<em class="parameter"><code><span class="type">xcb_drawable_t</span> drawable</code></em>,
<em class="parameter"><code><span class="type">xcb_render_pictforminfo_t</span> *format</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-XCB-Surfaces.html#cairo-xcb-surface-set-size" title="cairo_xcb_surface_set_size ()">cairo_xcb_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">void</span> <a class="link" href="cairo-XCB-Surfaces.html#cairo-xcb-surface-set-drawable" title="cairo_xcb_surface_set_drawable ()">cairo_xcb_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">xcb_drawable_t</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">xcb_connection_t</span> * <a class="link" href="cairo-XCB-Surfaces.html#cairo-xcb-device-get-connection" title="cairo_xcb_device_get_connection ()">cairo_xcb_device_get_connection</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-XCB-Surfaces.html#cairo-xcb-device-debug-cap-xrender-version" title="cairo_xcb_device_debug_cap_xrender_version ()">cairo_xcb_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">void</span> <a class="link" href="cairo-XCB-Surfaces.html#cairo-xcb-device-debug-cap-xshm-version" title="cairo_xcb_device_debug_cap_xshm_version ()">cairo_xcb_device_debug_cap_xshm_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-XCB-Surfaces.html#cairo-xcb-device-debug-get-precision" title="cairo_xcb_device_debug_get_precision ()">cairo_xcb_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-XCB-Surfaces.html#cairo-xcb-device-debug-set-precision" title="cairo_xcb_device_debug_set_precision ()">cairo_xcb_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-XCB-Surfaces.description"></a><h2>Description</h2>
<p>
The XCB surface is used to render cairo graphics to X Window System
windows and pixmaps using the XCB library.
</p>
<p>
Note that the XCB surface automatically takes advantage of the X render
extension if it is available.
</p>
</div>
<div class="refsect1">
<a name="cairo-XCB-Surfaces.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CAIRO-HAS-XCB-SURFACE:CAPS"></a><h3>CAIRO_HAS_XCB_SURFACE</h3>
<pre class="programlisting">#define CAIRO_HAS_XCB_SURFACE 1
</pre>
<p>
Defined if the xcb surface backend is available.
This macro can be used to conditionally compile backend-specific code.
</p>
<p class="since">Since 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-HAS-XCB-SHM-FUNCTIONS:CAPS"></a><h3>CAIRO_HAS_XCB_SHM_FUNCTIONS</h3>
<pre class="programlisting">#define CAIRO_HAS_XCB_SHM_FUNCTIONS 1
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xcb-surface-create"></a><h3>cairo_xcb_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_xcb_surface_create (<em class="parameter"><code><span class="type">xcb_connection_t</span> *connection</code></em>,
<em class="parameter"><code><span class="type">xcb_drawable_t</span> drawable</code></em>,
<em class="parameter"><code><span class="type">xcb_visualtype_t</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 XCB 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-XCB-Surfaces.html#cairo-xcb-surface-set-size" title="cairo_xcb_surface_set_size ()"><code class="function">cairo_xcb_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">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>an XCB connection</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>drawable</code></em> :</span></p></td>
<td>an XCB drawable</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>a pointer to the newly created surface. The caller
owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done
with it.
This function always returns a valid pointer, but it will return a
pointer to a "nil" surface if an error such as out of memory
occurs. You can use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a> to check for this.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xcb-surface-create-for-bitmap"></a><h3>cairo_xcb_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_xcb_surface_create_for_bitmap (<em class="parameter"><code><span class="type">xcb_connection_t</span> *connection</code></em>,
<em class="parameter"><code><span class="type">xcb_screen_t</span> *screen</code></em>,
<em class="parameter"><code><span class="type">xcb_pixmap_t</span> bitmap</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 XCB 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">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>an XCB connection</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>screen</code></em> :</span></p></td>
<td>the XCB screen associated with <em class="parameter"><code>bitmap</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bitmap</code></em> :</span></p></td>
<td>an XCB drawable (a Pixmap with depth 1)</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>a pointer to the newly created surface. The caller
owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done
with it.
This function always returns a valid pointer, but it will return a
pointer to a "nil" surface if an error such as out of memory
occurs. You can use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a> to check for this.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xcb-surface-create-with-xrender-format"></a><h3>cairo_xcb_surface_create_with_xrender_format ()</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_xcb_surface_create_with_xrender_format
(<em class="parameter"><code><span class="type">xcb_connection_t</span> *connection</code></em>,
<em class="parameter"><code><span class="type">xcb_screen_t</span> *screen</code></em>,
<em class="parameter"><code><span class="type">xcb_drawable_t</span> drawable</code></em>,
<em class="parameter"><code><span class="type">xcb_render_pictforminfo_t</span> *format</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 XCB surface that draws to the given drawable.
The way that colors are represented in the drawable is specified
by the provided picture format.
</p>
<p>
Note: If <em class="parameter"><code>drawable</code></em> is a Window, then the function
<a class="link" href="cairo-XCB-Surfaces.html#cairo-xcb-surface-set-size" title="cairo_xcb_surface_set_size ()"><code class="function">cairo_xcb_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">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>an XCB connection</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>screen</code></em> :</span></p></td>
<td>the XCB screen associated with <em class="parameter"><code>drawable</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>drawable</code></em> :</span></p></td>
<td>an XCB drawable</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the picture format to use for drawing to <em class="parameter"><code>drawable</code></em>. The
depth of <em class="parameter"><code>format</code></em> mush match the depth of the drawable.</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>a pointer to the newly created surface. The caller
owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done
with it.
This function always returns a valid pointer, but it will return a
pointer to a "nil" surface if an error such as out of memory
occurs. You can use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a> to check for this.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xcb-surface-set-size"></a><h3>cairo_xcb_surface_set_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xcb_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 XCB 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>
<p>
If <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-flush" title="cairo_surface_flush ()"><code class="function">cairo_surface_flush()</code></a> wasn't called, some pending operations
might be discarded.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<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 XCB 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 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xcb-surface-set-drawable"></a><h3>cairo_xcb_surface_set_drawable ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xcb_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">xcb_drawable_t</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 the new drawable and size of the XCB drawable underlying the
surface.
</p>
<p>
If <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-flush" title="cairo_surface_flush ()"><code class="function">cairo_surface_flush()</code></a> wasn't called, some pending operations
might be discarded.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<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 XCB backend</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>drawable</code></em> :</span></p></td>
<td>the new drawable of the surface</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 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xcb-device-get-connection"></a><h3>cairo_xcb_device_get_connection ()</h3>
<pre class="programlisting"><span class="returnvalue">xcb_connection_t</span> * cairo_xcb_device_get_connection (<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 connection for the XCB device.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<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 XCB backend</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <span class="type">xcb_connection_t</span> for the connection</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xcb-device-debug-cap-xrender-version"></a><h3>cairo_xcb_device_debug_cap_xrender_version ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xcb_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 XCB 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">
<col align="left" valign="top">
<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 XCB 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-xcb-device-debug-cap-xshm-version"></a><h3>cairo_xcb_device_debug_cap_xshm_version ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xcb_device_debug_cap_xshm_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 XCB surfaces for this devices to the specified version
of the SHM extension. This function exists solely for debugging purpose.
It let's you find out how cairo would behave with an older version of
the SHM extension.
</p>
<p>
Use the special values -1 and -1 for disabling the SHM extension.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<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 XCB 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-xcb-device-debug-get-precision"></a><h3>cairo_xcb_device_debug_get_precision ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> cairo_xcb_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">
<col align="left" valign="top">
<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 XCB 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-xcb-device-debug-set-precision"></a><h3>cairo_xcb_device_debug_set_precision ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cairo_xcb_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">
<col align="left" valign="top">
<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 XCB 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-XCB-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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