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<a href="#cairo-XLib-XRender-Backend.description" class="shortcut">Description</a>
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<a name="cairo-XLib-XRender-Backend"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="cairo-XLib-XRender-Backend.top_of_page"></a>XLib-XRender Backend</span></h2>
<p>XLib-XRender Backend — X Window System rendering using XLib and the X Render extension</p>
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<div class="refsynopsisdiv">
<a name="cairo-XLib-XRender-Backend.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define <a class="link" href="cairo-XLib-XRender-Backend.html#CAIRO-HAS-XLIB-XRENDER-SURFACE:CAPS" title="CAIRO_HAS_XLIB_XRENDER_SURFACE">CAIRO_HAS_XLIB_XRENDER_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-XRender-Backend.html#cairo-xlib-surface-create-with-xrender-format" title="cairo_xlib_surface_create_with_xrender_format ()">cairo_xlib_surface_create_with_xrender_format</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">Screen</span> *screen</code></em>,
<em class="parameter"><code><span class="type">XRenderPictFormat</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">XRenderPictFormat</span> * <a class="link" href="cairo-XLib-XRender-Backend.html#cairo-xlib-surface-get-xrender-format" title="cairo_xlib_surface_get_xrender_format ()">cairo_xlib_surface_get_xrender_format</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>);
</pre>
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<div class="refsect1">
<a name="cairo-XLib-XRender-Backend.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 and Xrender libraries.
</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-XRender-Backend.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CAIRO-HAS-XLIB-XRENDER-SURFACE:CAPS"></a><h3>CAIRO_HAS_XLIB_XRENDER_SURFACE</h3>
<pre class="programlisting">#define CAIRO_HAS_XLIB_XRENDER_SURFACE 1
</pre>
<p>
Defined if the XLib/XRender surface functions are available.
This macro can be used to conditionally compile backend-specific code.
</p>
<p class="since">Since 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-xlib-surface-create-with-xrender-format"></a><h3>cairo_xlib_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_xlib_surface_create_with_xrender_format
(<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">Screen</span> *screen</code></em>,
<em class="parameter"><code><span class="type">XRenderPictFormat</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 Xlib 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-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>
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<td><p><span class="term"><em class="parameter"><code>dpy</code></em> :</span></p></td>
<td>an X Display</td>
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<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>screen</code></em> :</span></p></td>
<td>the X Screen associated with <em class="parameter"><code>drawable</code></em>
</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> must 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>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-get-xrender-format"></a><h3>cairo_xlib_surface_get_xrender_format ()</h3>
<pre class="programlisting"><span class="returnvalue">XRenderPictFormat</span> * cairo_xlib_surface_get_xrender_format
(<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 Render picture format that <em class="parameter"><code>surface</code></em> uses for rendering with the
X Render extension. If the surface was created by
<a class="link" href="cairo-XLib-XRender-Backend.html#cairo-xlib-surface-create-with-xrender-format" title="cairo_xlib_surface_create_with_xrender_format ()"><code class="function">cairo_xlib_surface_create_with_xrender_format()</code></a> originally, the return
value is the format passed to that constructor.
</p>
<div class="variablelist"><table border="0">
<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>an xlib surface</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the XRenderPictFormat* associated with <em class="parameter"><code>surface</code></em>,
or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the surface is not an xlib surface
or if the X Render extension is not available.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.6</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-XLib-XRender-Backend.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>
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