public function render()
{
$presentationPpts = $this->oPresentation->getPresentationProperties();
// Create XML writer
$objWriter = new XMLWriter(XMLWriter::STORAGE_MEMORY);
// XML header
$objWriter->startDocument('1.0', 'UTF-8', 'yes');
// p:presentationPr
$objWriter->startElement('p:presentationPr');
$objWriter->writeAttribute('xmlns:a', 'http://schemas.openxmlformats.org/drawingml/2006/main');
$objWriter->writeAttribute('xmlns:r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');
$objWriter->writeAttribute('xmlns:p', 'http://schemas.openxmlformats.org/presentationml/2006/main');
// p:presentationPr > p:showPr
if ($presentationPpts->isLoopContinuouslyUntilEsc()) {
$objWriter->startElement('p:showPr');
$objWriter->writeAttribute('loop', '1');
$objWriter->endElement();
}
// p:extLst
$objWriter->startElement('p:extLst');
// p:ext
$objWriter->startElement('p:ext');
$objWriter->writeAttribute('uri', '{E76CE94A-603C-4142-B9EB-6D1370010A27}');
// p14:discardImageEditData
$objWriter->startElement('p14:discardImageEditData');
$objWriter->writeAttribute('xmlns:p14', 'http://schemas.microsoft.com/office/powerpoint/2010/main');
$objWriter->writeAttribute('val', '0');
$objWriter->endElement();
// > p:ext
$objWriter->endElement();
// p:ext
$objWriter->startElement('p:ext');
$objWriter->writeAttribute('uri', '{D31A062A-798A-4329-ABDD-BBA856620510}');
// p14:defaultImageDpi
$objWriter->startElement('p14:defaultImageDpi');
$objWriter->writeAttribute('xmlns:p14', 'http://schemas.microsoft.com/office/powerpoint/2010/main');
$objWriter->writeAttribute('val', '220');
$objWriter->endElement();
// > p:ext
$objWriter->endElement();
// > p:extLst
$objWriter->endElement();
// > p:presentationPr
$objWriter->endElement();
$this->getZip()->addFromString('ppt/presProps.xml', $objWriter->getData());
return $this->getZip();
}