$ext = $con->textExtents($str);
$sf = $con->getScaledFont();
$sext = $sf->textExtents("text");
$lw = $con->getLineWidth();
$con->rectangle($x + $ext["x_bearing"] - $lw / 2, $y + $ext["y_bearing"] - $lw / 2, $ext["width"] + $lw, $ext["height"] + $lw);
$con->stroke();
$con->moveTo($x, $y);
$con->showText($str);
$con->restore();
}
$sur = new CairoImageSurface(CairoFormat::ARGB32, 38, 34);
$con = new CairoContext($sur);
$con->setSourceRgb(1, 1, 1);
$con->paint();
$con->selectFontFace("Bitstream Vera Sans");
$con->setFontSize(12);
$con->translate(4, 4);
$con->setLineWidth(1);
$ext = $con->textExtents("text");
$con->setSourceRgb(0, 0, 0);
box_text("text", 0, -$ext["y_bearing"]);
$mat = new CairoMatrix();
$mat->translate(6, 16);
$mat->scale(12, 12);
$con->setFontMatrix($mat);
$con->setSourceRgb(0, 0, 1);
box_text("text", 0, -$ext["y_bearing"]);
$sur->writeToPng(dirname(__FILE__) . "/font-matrix-translation-php.png");
?>
