save canvas with svg as pdf

function download_as_pdf(canvas, filename) {
    var pdf = new jsPDF('p', 'pt', [canvas.width, canvas.height]);
    pdf.canvas.height = canvas.height;
    pdf.canvas.width = canvas.width;
    var imgData = canvas.toDataURL("image/jpeg", 1.0);
    pdf.addImage(imgData, 'JPEG', 0, 0, canvas.width, canvas.height);
    pdf.save(filename + '.pdf');
}