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<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.10 $ -->
<refentry xml:id="function.imagelayereffect" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagelayereffect</refname>
<refpurpose>Set the alpha blending flag to use the bundled libgd layering effects</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>imagelayereffect</methodname>
<methodparam><type>resource</type><parameter>image</parameter></methodparam>
<methodparam><type>int</type><parameter>effect</parameter></methodparam>
</methodsynopsis>
<para>
Set the alpha blending flag to use the bundled libgd layering effects.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>effect</parameter></term>
<listitem>
<para>
One of the following constants:
<variablelist>
<varlistentry>
<term><constant>IMG_EFFECT_REPLACE</constant></term>
<listitem>
<simpara>
Use pixel replacement (equivalent of passing &true; to
<function>imagealphablending</function>)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>IMG_EFFECT_ALPHABLEND</constant></term>
<listitem>
<simpara>
Use normal pixel blending (equivalent of passing &false; to
<function>imagealphablending</function>)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>IMG_EFFECT_NORMAL</constant></term>
<listitem>
<simpara>
Same as <constant>IMG_EFFECT_ALPHABLEND</constant>.
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>IMG_EFFECT_OVERLAY</constant></term>
<listitem>
<simpara>
Overlay has the effect that black background pixels will remain
black, white background pixels will remain white, but grey
background pixels will take the colour of the foreground pixel.
</simpara>
</listitem>
</varlistentry>
</variablelist>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>imagelayereffect</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Setup an image
$im = imagecreatetruecolor(100, 100);
// Set a background
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im, 220, 220, 220));
// Apply the overlay alpha blending flag
imagelayereffect($im, IMG_EFFECT_OVERLAY);
// Draw two grey ellipses
imagefilledellipse($im, 50, 50, 40, 40, imagecolorallocate($im, 100, 255, 100));
imagefilledellipse($im, 50, 50, 50, 80, imagecolorallocate($im, 100, 100, 255));
imagefilledellipse($im, 50, 50, 80, 50, imagecolorallocate($im, 255, 100, 100));
// Output
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
]]>
</programlisting>
&example.outputs.similar;
<mediaobject>
<imageobject>
<imagedata fileref="figures/image.imagelayereffect.png"/>
</imageobject>
</mediaobject>
</example>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.bundled.gd;
¬e.gd.2;
</refsect1>
</refentry>
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