PHP Decode

<?php
$sur = new CairoImageSurface(CairoFormat::ARGB32, 10, 10);
$con = new CairoContext($sur);

$data="";
for($i = 0; $i<4; $i++) {
	$data = $data . chr(0x80);
    $data = $data . chr(0x00);
    $data = $data . chr(0x00);
    $data = $data . chr(0x00);
}

$s = new CairoImageSurface(CairoFormat::ARGB32,1,1);
$s->createForData(data,CairoFormat::ARGB32, 2, 2, 8);
$pat = new CairoSurfacePattern($s);
$con->setSourceRgb(1,0,0);

$con->save();
$con->translate(2,2);
$con->mask($pat);
$con->restore();

$mat = new CairoMatrix();
$mat->translate(-4,-4);
$pat->setMatrix($mat);

$con->mask($pat);

$con->translate(2,2);
$con->mask($pat);

$sur->writeToPng(dirname(__FILE__)  . "/mask-ctm-php.png");
?>