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<refentry id="cairo-XLib-Surfaces">
<refmeta>
<refentrytitle role="top_of_page" id="cairo-XLib-Surfaces.top_of_page">XLib Surfaces</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>
  CAIRO Library
</refmiscinfo>
</refmeta>
<refnamediv>
<refname>XLib Surfaces</refname>
<refpurpose>X Window System rendering using XLib</refpurpose>
</refnamediv>

<refsynopsisdiv id="cairo-XLib-Surfaces.synopsis" role="synopsis">
<title role="synopsis.title">Synopsis</title>

<synopsis>#define             <link linkend="CAIRO-HAS-XLIB-SURFACE:CAPS">CAIRO_HAS_XLIB_SURFACE</link>
<link linkend="cairo-surface-t"><returnvalue>cairo_surface_t</returnvalue></link> *   <link linkend="cairo-xlib-surface-create">cairo_xlib_surface_create</link>           (<parameter><link linkend="Display"><type>Display</type></link> *dpy</parameter>,
                                                         <parameter><link linkend="Drawable"><type>Drawable</type></link> drawable</parameter>,
                                                         <parameter><link linkend="Visual"><type>Visual</type></link> *visual</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);
<link linkend="cairo-surface-t"><returnvalue>cairo_surface_t</returnvalue></link> *   <link linkend="cairo-xlib-surface-create-for-bitmap">cairo_xlib_surface_create_for_bitmap</link>
                                                        (<parameter><link linkend="Display"><type>Display</type></link> *dpy</parameter>,
                                                         <parameter><link linkend="Pixmap"><type>Pixmap</type></link> bitmap</parameter>,
                                                         <parameter><link linkend="Screen"><type>Screen</type></link> *screen</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);
<link linkend="void"><returnvalue>void</returnvalue></link>                <link linkend="cairo-xlib-surface-set-size">cairo_xlib_surface_set_size</link>         (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);
<link linkend="Display"><returnvalue>Display</returnvalue></link> *           <link linkend="cairo-xlib-surface-get-display">cairo_xlib_surface_get_display</link>      (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);
<link linkend="Screen"><returnvalue>Screen</returnvalue></link> *            <link linkend="cairo-xlib-surface-get-screen">cairo_xlib_surface_get_screen</link>       (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);
<link linkend="void"><returnvalue>void</returnvalue></link>                <link linkend="cairo-xlib-surface-set-drawable">cairo_xlib_surface_set_drawable</link>     (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>,
                                                         <parameter><link linkend="Drawable"><type>Drawable</type></link> drawable</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);
<link linkend="Drawable"><returnvalue>Drawable</returnvalue></link>            <link linkend="cairo-xlib-surface-get-drawable">cairo_xlib_surface_get_drawable</link>     (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);
<link linkend="Visual"><returnvalue>Visual</returnvalue></link> *            <link linkend="cairo-xlib-surface-get-visual">cairo_xlib_surface_get_visual</link>       (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);
<link linkend="int"><returnvalue>int</returnvalue></link>                 <link linkend="cairo-xlib-surface-get-width">cairo_xlib_surface_get_width</link>        (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);
<link linkend="int"><returnvalue>int</returnvalue></link>                 <link linkend="cairo-xlib-surface-get-height">cairo_xlib_surface_get_height</link>       (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);
<link linkend="int"><returnvalue>int</returnvalue></link>                 <link linkend="cairo-xlib-surface-get-depth">cairo_xlib_surface_get_depth</link>        (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);
<link linkend="void"><returnvalue>void</returnvalue></link>                <link linkend="cairo-xlib-device-debug-cap-xrender-version">cairo_xlib_device_debug_cap_xrender_version</link>
                                                        (<parameter><link linkend="cairo-device-t"><type>cairo_device_t</type></link> *device</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> major_version</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> minor_version</parameter>);
<link linkend="int"><returnvalue>int</returnvalue></link>                 <link linkend="cairo-xlib-device-debug-get-precision">cairo_xlib_device_debug_get_precision</link>
                                                        (<parameter><link linkend="cairo-device-t"><type>cairo_device_t</type></link> *device</parameter>);
<link linkend="void"><returnvalue>void</returnvalue></link>                <link linkend="cairo-xlib-device-debug-set-precision">cairo_xlib_device_debug_set_precision</link>
                                                        (<parameter><link linkend="cairo-device-t"><type>cairo_device_t</type></link> *device</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> precision</parameter>);
</synopsis>
</refsynopsisdiv>

<refsect1 id="cairo-XLib-Surfaces.description" role="desc">
<title role="desc.title">Description</title>
<para>
The XLib surface is used to render cairo graphics to X Window System
windows and pixmaps using the XLib library.
</para>
<para>
Note that the XLib surface automatically takes advantage of X render extension
if it is available.
</para>
</refsect1>
<refsect1 id="cairo-XLib-Surfaces.details" role="details">
<title role="details.title">Details</title>
<refsect2 id="CAIRO-HAS-XLIB-SURFACE:CAPS" role="macro" condition="since:1.0">
<title>CAIRO_HAS_XLIB_SURFACE</title>
<indexterm zone="CAIRO-HAS-XLIB-SURFACE:CAPS" role="1.0"><primary sortas="HAS_XLIB_SURFACE">CAIRO_HAS_XLIB_SURFACE</primary></indexterm>
<programlisting>#define CAIRO_HAS_XLIB_SURFACE 1
</programlisting>
<para>
Defined if the Xlib surface backend is available.
This macro can be used to conditionally compile backend-specific code.
</para><para role="since">Since 1.0</para></refsect2>
<refsect2 id="cairo-xlib-surface-create" role="function" condition="since:1.0">
<title>cairo_xlib_surface_create ()</title>
<indexterm zone="cairo-xlib-surface-create" role="1.0"><primary sortas="xlib_surface_create">cairo_xlib_surface_create</primary></indexterm>
<programlisting><link linkend="cairo-surface-t"><returnvalue>cairo_surface_t</returnvalue></link> *   cairo_xlib_surface_create           (<parameter><link linkend="Display"><type>Display</type></link> *dpy</parameter>,
                                                         <parameter><link linkend="Drawable"><type>Drawable</type></link> drawable</parameter>,
                                                         <parameter><link linkend="Visual"><type>Visual</type></link> *visual</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);</programlisting>
<para>
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.
</para>
<para>
Note: If <parameter>drawable</parameter> is a Window, then the function
<link linkend="cairo-xlib-surface-set-size"><function>cairo_xlib_surface_set_size()</function></link> must be called whenever the size of the
window changes.
</para>
<para>
When <parameter>drawable</parameter> 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.
</para><variablelist role="params">
<varlistentry><term><parameter>dpy</parameter>&#160;:</term>
<listitem><simpara>an X Display</simpara></listitem></varlistentry>
<varlistentry><term><parameter>drawable</parameter>&#160;:</term>
<listitem><simpara>an X Drawable, (a Pixmap or a Window)</simpara></listitem></varlistentry>
<varlistentry><term><parameter>visual</parameter>&#160;:</term>
<listitem><simpara>the visual to use for drawing to <parameter>drawable</parameter>. The depth
of the visual must match the depth of the drawable.
Currently, only TrueColor visuals are fully supported.</simpara></listitem></varlistentry>
<varlistentry><term><parameter>width</parameter>&#160;:</term>
<listitem><simpara>the current width of <parameter>drawable</parameter>.</simpara></listitem></varlistentry>
<varlistentry><term><parameter>height</parameter>&#160;:</term>
<listitem><simpara>the current height of <parameter>drawable</parameter>.</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the newly created surface</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.0</para></refsect2>
<refsect2 id="cairo-xlib-surface-create-for-bitmap" role="function" condition="since:1.0">
<title>cairo_xlib_surface_create_for_bitmap ()</title>
<indexterm zone="cairo-xlib-surface-create-for-bitmap" role="1.0"><primary sortas="xlib_surface_create_for_bitmap">cairo_xlib_surface_create_for_bitmap</primary></indexterm>
<programlisting><link linkend="cairo-surface-t"><returnvalue>cairo_surface_t</returnvalue></link> *   cairo_xlib_surface_create_for_bitmap
                                                        (<parameter><link linkend="Display"><type>Display</type></link> *dpy</parameter>,
                                                         <parameter><link linkend="Pixmap"><type>Pixmap</type></link> bitmap</parameter>,
                                                         <parameter><link linkend="Screen"><type>Screen</type></link> *screen</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);</programlisting>
<para>
Creates an Xlib surface that draws to the given bitmap.
This will be drawn to as a <link linkend="CAIRO-FORMAT-A1:CAPS"><literal>CAIRO_FORMAT_A1</literal></link> object.
</para><variablelist role="params">
<varlistentry><term><parameter>dpy</parameter>&#160;:</term>
<listitem><simpara>an X Display</simpara></listitem></varlistentry>
<varlistentry><term><parameter>bitmap</parameter>&#160;:</term>
<listitem><simpara>an X Drawable, (a depth-1 Pixmap)</simpara></listitem></varlistentry>
<varlistentry><term><parameter>screen</parameter>&#160;:</term>
<listitem><simpara>the X Screen associated with <parameter>bitmap</parameter></simpara></listitem></varlistentry>
<varlistentry><term><parameter>width</parameter>&#160;:</term>
<listitem><simpara>the current width of <parameter>bitmap</parameter>.</simpara></listitem></varlistentry>
<varlistentry><term><parameter>height</parameter>&#160;:</term>
<listitem><simpara>the current height of <parameter>bitmap</parameter>.</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the newly created surface</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.0</para></refsect2>
<refsect2 id="cairo-xlib-surface-set-size" role="function" condition="since:1.0">
<title>cairo_xlib_surface_set_size ()</title>
<indexterm zone="cairo-xlib-surface-set-size" role="1.0"><primary sortas="xlib_surface_set_size">cairo_xlib_surface_set_size</primary></indexterm>
<programlisting><link linkend="void"><returnvalue>void</returnvalue></link>                cairo_xlib_surface_set_size         (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);</programlisting>
<para>
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.)
</para>
<para>
A Pixmap can never change size, so it is never necessary to call
this function on a surface created for a Pixmap.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> for the XLib backend</simpara></listitem></varlistentry>
<varlistentry><term><parameter>width</parameter>&#160;:</term>
<listitem><simpara>the new width of the surface</simpara></listitem></varlistentry>
<varlistentry><term><parameter>height</parameter>&#160;:</term>
<listitem><simpara>the new height of the surface</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.0</para></refsect2>
<refsect2 id="cairo-xlib-surface-get-display" role="function" condition="since:1.2">
<title>cairo_xlib_surface_get_display ()</title>
<indexterm zone="cairo-xlib-surface-get-display" role="1.2"><primary sortas="xlib_surface_get_display">cairo_xlib_surface_get_display</primary></indexterm>
<programlisting><link linkend="Display"><returnvalue>Display</returnvalue></link> *           cairo_xlib_surface_get_display      (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);</programlisting>
<para>
Get the X Display for the underlying X Drawable.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-xlib-surface-t"><type>cairo_xlib_surface_t</type></link></simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the display.</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.2</para></refsect2>
<refsect2 id="cairo-xlib-surface-get-screen" role="function" condition="since:1.2">
<title>cairo_xlib_surface_get_screen ()</title>
<indexterm zone="cairo-xlib-surface-get-screen" role="1.2"><primary sortas="xlib_surface_get_screen">cairo_xlib_surface_get_screen</primary></indexterm>
<programlisting><link linkend="Screen"><returnvalue>Screen</returnvalue></link> *            cairo_xlib_surface_get_screen       (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);</programlisting>
<para>
Get the X Screen for the underlying X Drawable.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-xlib-surface-t"><type>cairo_xlib_surface_t</type></link></simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the screen.</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.2</para></refsect2>
<refsect2 id="cairo-xlib-surface-set-drawable" role="function" condition="since:1.0">
<title>cairo_xlib_surface_set_drawable ()</title>
<indexterm zone="cairo-xlib-surface-set-drawable" role="1.0"><primary sortas="xlib_surface_set_drawable">cairo_xlib_surface_set_drawable</primary></indexterm>
<programlisting><link linkend="void"><returnvalue>void</returnvalue></link>                cairo_xlib_surface_set_drawable     (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>,
                                                         <parameter><link linkend="Drawable"><type>Drawable</type></link> drawable</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> width</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> height</parameter>);</programlisting>
<para>
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.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> for the XLib backend</simpara></listitem></varlistentry>
<varlistentry><term><parameter>drawable</parameter>&#160;:</term>
<listitem><simpara>the new drawable for the surface</simpara></listitem></varlistentry>
<varlistentry><term><parameter>width</parameter>&#160;:</term>
<listitem><simpara>the width of the new drawable</simpara></listitem></varlistentry>
<varlistentry><term><parameter>height</parameter>&#160;:</term>
<listitem><simpara>the height of the new drawable</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.0</para></refsect2>
<refsect2 id="cairo-xlib-surface-get-drawable" role="function" condition="since:1.2">
<title>cairo_xlib_surface_get_drawable ()</title>
<indexterm zone="cairo-xlib-surface-get-drawable" role="1.2"><primary sortas="xlib_surface_get_drawable">cairo_xlib_surface_get_drawable</primary></indexterm>
<programlisting><link linkend="Drawable"><returnvalue>Drawable</returnvalue></link>            cairo_xlib_surface_get_drawable     (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);</programlisting>
<para>
Get the underlying X Drawable used for the surface.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-xlib-surface-t"><type>cairo_xlib_surface_t</type></link></simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the drawable.</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.2</para></refsect2>
<refsect2 id="cairo-xlib-surface-get-visual" role="function" condition="since:1.2">
<title>cairo_xlib_surface_get_visual ()</title>
<indexterm zone="cairo-xlib-surface-get-visual" role="1.2"><primary sortas="xlib_surface_get_visual">cairo_xlib_surface_get_visual</primary></indexterm>
<programlisting><link linkend="Visual"><returnvalue>Visual</returnvalue></link> *            cairo_xlib_surface_get_visual       (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);</programlisting>
<para>
Gets the X Visual associated with <parameter>surface</parameter>, suitable for use with the
underlying X Drawable.  If <parameter>surface</parameter> was created by
<link linkend="cairo-xlib-surface-create"><function>cairo_xlib_surface_create()</function></link>, the return value is the Visual passed to that
constructor.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-xlib-surface-t"><type>cairo_xlib_surface_t</type></link></simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the Visual or <link linkend="NULL:CAPS"><literal>NULL</literal></link> if there is no appropriate Visual for
<parameter>surface</parameter>.</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.2</para></refsect2>
<refsect2 id="cairo-xlib-surface-get-width" role="function" condition="since:1.2">
<title>cairo_xlib_surface_get_width ()</title>
<indexterm zone="cairo-xlib-surface-get-width" role="1.2"><primary sortas="xlib_surface_get_width">cairo_xlib_surface_get_width</primary></indexterm>
<programlisting><link linkend="int"><returnvalue>int</returnvalue></link>                 cairo_xlib_surface_get_width        (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);</programlisting>
<para>
Get the width of the X Drawable underlying the surface in pixels.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-xlib-surface-t"><type>cairo_xlib_surface_t</type></link></simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the width of the surface in pixels.</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.2</para></refsect2>
<refsect2 id="cairo-xlib-surface-get-height" role="function" condition="since:1.2">
<title>cairo_xlib_surface_get_height ()</title>
<indexterm zone="cairo-xlib-surface-get-height" role="1.2"><primary sortas="xlib_surface_get_height">cairo_xlib_surface_get_height</primary></indexterm>
<programlisting><link linkend="int"><returnvalue>int</returnvalue></link>                 cairo_xlib_surface_get_height       (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);</programlisting>
<para>
Get the height of the X Drawable underlying the surface in pixels.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-xlib-surface-t"><type>cairo_xlib_surface_t</type></link></simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the height of the surface in pixels.</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.2</para></refsect2>
<refsect2 id="cairo-xlib-surface-get-depth" role="function" condition="since:1.2">
<title>cairo_xlib_surface_get_depth ()</title>
<indexterm zone="cairo-xlib-surface-get-depth" role="1.2"><primary sortas="xlib_surface_get_depth">cairo_xlib_surface_get_depth</primary></indexterm>
<programlisting><link linkend="int"><returnvalue>int</returnvalue></link>                 cairo_xlib_surface_get_depth        (<parameter><link linkend="cairo-surface-t"><type>cairo_surface_t</type></link> *surface</parameter>);</programlisting>
<para>
Get the number of bits used to represent each pixel value.
</para><variablelist role="params">
<varlistentry><term><parameter>surface</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-xlib-surface-t"><type>cairo_xlib_surface_t</type></link></simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the depth of the surface in bits.</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.2</para></refsect2>
<refsect2 id="cairo-xlib-device-debug-cap-xrender-version" role="function" condition="since:1.12">
<title>cairo_xlib_device_debug_cap_xrender_version ()</title>
<indexterm zone="cairo-xlib-device-debug-cap-xrender-version" role="1.12"><primary sortas="xlib_device_debug_cap_xrender_version">cairo_xlib_device_debug_cap_xrender_version</primary></indexterm>
<programlisting><link linkend="void"><returnvalue>void</returnvalue></link>                cairo_xlib_device_debug_cap_xrender_version
                                                        (<parameter><link linkend="cairo-device-t"><type>cairo_device_t</type></link> *device</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> major_version</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> minor_version</parameter>);</programlisting>
<para>
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.
</para>
<para>
Use the special values -1 and -1 for disabling the RENDER extension.
</para><variablelist role="params">
<varlistentry><term><parameter>device</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-device-t"><type>cairo_device_t</type></link> for the Xlib backend</simpara></listitem></varlistentry>
<varlistentry><term><parameter>major_version</parameter>&#160;:</term>
<listitem><simpara>major version to restrict to</simpara></listitem></varlistentry>
<varlistentry><term><parameter>minor_version</parameter>&#160;:</term>
<listitem><simpara>minor version to restrict to</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.12</para></refsect2>
<refsect2 id="cairo-xlib-device-debug-get-precision" role="function" condition="since:1.12">
<title>cairo_xlib_device_debug_get_precision ()</title>
<indexterm zone="cairo-xlib-device-debug-get-precision" role="1.12"><primary sortas="xlib_device_debug_get_precision">cairo_xlib_device_debug_get_precision</primary></indexterm>
<programlisting><link linkend="int"><returnvalue>int</returnvalue></link>                 cairo_xlib_device_debug_get_precision
                                                        (<parameter><link linkend="cairo-device-t"><type>cairo_device_t</type></link> *device</parameter>);</programlisting>
<para>
Get the Xrender precision mode.
</para><variablelist role="params">
<varlistentry><term><parameter>device</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-device-t"><type>cairo_device_t</type></link> for the Xlib backend</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis>&#160;:</term><listitem><simpara>the render precision mode</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.12</para></refsect2>
<refsect2 id="cairo-xlib-device-debug-set-precision" role="function" condition="since:1.12">
<title>cairo_xlib_device_debug_set_precision ()</title>
<indexterm zone="cairo-xlib-device-debug-set-precision" role="1.12"><primary sortas="xlib_device_debug_set_precision">cairo_xlib_device_debug_set_precision</primary></indexterm>
<programlisting><link linkend="void"><returnvalue>void</returnvalue></link>                cairo_xlib_device_debug_set_precision
                                                        (<parameter><link linkend="cairo-device-t"><type>cairo_device_t</type></link> *device</parameter>,
                                                         <parameter><link linkend="int"><type>int</type></link> precision</parameter>);</programlisting>
<para>
Render supports two modes of precision when rendering trapezoids. Set
the precision to the desired mode.
</para><variablelist role="params">
<varlistentry><term><parameter>device</parameter>&#160;:</term>
<listitem><simpara>a <link linkend="cairo-device-t"><type>cairo_device_t</type></link> for the Xlib backend</simpara></listitem></varlistentry>
<varlistentry><term><parameter>precision</parameter>&#160;:</term>
<listitem><simpara>the precision to use</simpara></listitem></varlistentry>
</variablelist><para role="since">Since 1.12</para></refsect2>

</refsect1>
<refsect1 id="cairo-XLib-Surfaces.see-also">
<title>See Also</title>
<link linkend="cairo-surface-t"><type>cairo_surface_t</type></link>
</refsect1>

</refentry>
