how to stretch background image of pushbutton on button resize?

how to stretch background image of pushbutton on button resize?

i tryed this code. But not worked at all. its works for frame, central widgets, labels but not working on pushbutton

Code:

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void MainWindow::resizeEvent(QResizeEvent *e)
{
    ui->centralWidget->setGeometry(0,0,e->size().width(),e->size().height());
    ui->pushButton->setGeometry(0,0,(e->size().width())/2,(e->size().height())/2);
    QPalette let = ui->pushButton->palette();
    QSize size(ui->pushButton->width(),ui->pushButton->height());
    QString main=":/M_alertBtncontinueUpNews.png";
    QPixmap pixmapmain1(main);
    QPixmap pixmapmain(pixmapmain1.scaled(size));
    let.setBrush(QPalette::Background,pixmapmain);
    ui->pushButton->setPalette(let);
    ui->pushButton->setAutoFillBackground(true);
}

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Added after 22 minutes:

i got the code...
this worked for me

Code:

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ui->centralWidget->setGeometry(0,0,e->size().width(),e->size().height());
    ui->pushButton->setGeometry(0,0,(e->size().width())/2,(e->size().height())/2);
    QPixmap* extpixmap = new QPixmap(":/M_alertBtncontinueUpNews.png");
    QSize size2(ui->pushButton->width(),ui->pushButton->height());
    QPixmap pixmapmain2(extpixmap->scaled(size2));
    QIcon exticon(pixmapmain2);
    ui->pushButton->setIconSize(size2);
    ui->pushButton->setIcon(exticon);

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