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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 322055 $ -->
<refentry xml:id="cairocontext.clippreserve" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>CairoContext::clipPreserve</refname>
<refname>cairo_clip_preserve</refname>
<refpurpose>Establishes a new clip region from the current clip</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<para>&style.oop; (method):</para>
<methodsynopsis>
<modifier>public</modifier> <type>void</type><methodname>CairoContext::clipPreserve</methodname>
<void />
</methodsynopsis>
<para>&style.procedural;:</para>
<methodsynopsis>
<type>void</type><methodname>cairo_clip_preserve</methodname>
<methodparam><type>CairoContext</type><parameter>context</parameter></methodparam>
</methodsynopsis>
<para>
Establishes a new clip region by intersecting the current clip region with the current path as
it would be filled by <methodname>Context.fill</methodname> and according to the current
FILL RULE (see <methodname>CairoContext::setFillRule</methodname> or
<function>cairo_set_fill_rule</function>).
</para>
<para>
Unlike <methodname>CairoContext::clip</methodname>, <methodname>CairoContext::clipPreserve</methodname>
preserves the path within the Context.
The current clip region affects all drawing operations by effectively masking out any changes
to the surface that are outside the current clip region.
</para>
<para>
Calling <methodname>CairoContext::clipPreserve</methodname> can only make the clip region smaller,
never larger. But the current clip is part of the graphics state, so a temporary restriction of the clip
region can be achieved by calling <methodname>CairoContext::clipPreserve</methodname> within a
<methodname>CairoContext::save</methodname>/<methodname>CairoContext::restore</methodname> pair.
The only other means of increasing the size of the clip region is <methodname>CairoContext::resetClip</methodname>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>context</parameter></term>
<listitem>
<para>
A valid CairoContext object
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.void;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>&style.oop;</title>
<programlisting role="php">
<![CDATA[
<?php
$surface = new CairoImageSurface(CairoFormat::ARGB32, 50, 50);
$context = new CairoContext($surface);
$context->clipPreserve();
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>&style.procedural;</title>
<programlisting role="php">
<![CDATA[
<?php
$surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 50, 50);
$context = cairo_create($surface);
cairo_clip_preserve($context);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><methodname>CairoContext::save</methodname></member>
<member><methodname>CairoContext::restore</methodname></member>
<member><methodname>CairoContext::resetClip</methodname></member>
</simplelist>
</para>
</refsect1>
</refentry>
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