QTextBrowser paste insertFromMimeData(mimex)

I have reimplement QTextBrowser to paste image && load on a image tag <img> on QTextDocument

But i like to work on vector svg image format format how i can discovery this Mime?
&& save on disc format one copy as svg format & one as png?

Code:

bool QVimedit::canInsertFromMimeData ( const QMimeData * source )
{
    return QTextEdit::canInsertFromMimeData(source);
     qDebug() << "### insertFromMimeData 1  ";
}
void QVimedit::insertFromMimeData ( const QMimeData * source )
{
 
    qDebug() << "### insertFromMimeData 2  ";
 
    if ( source->hasImage() ) {
         numerobase++;
         const  QString nuovaim = QString("%2/image_%1.png").arg(numerobase).arg(QDir::homePath());
         QImage images = qvariant_cast<QImage>(source->imageData());
         bool salvato = images.save(nuovaim,"PNG",100);
         //////////////////qDebug() << "### salvato 1/0  " << salvato;
          emit TakeImage(nuovaim);
         return;
    }
    QTextEdit::insertFromMimeData(source);
    if ( source->formats().contains("text/html") ) {
        qDebug() << "### incomming paste text/html  ";
        emit IncommingHTML();
    }
}