#include <QtGui>
#include <QHBoxLayout>

int main(int argc, char **argv) {
    QApplication app(argc, argv);
    QPixmap pix(128, 128);
    pix.fill(Qt::black);
    {
        QPainter p(&pix);
        QLinearGradient gradient(0, 0, 128, 128);
        gradient.setColorAt(0, Qt::red);
        gradient.setColorAt(1, Qt::blue);
        p.fillRect(0,0,128,128, gradient);
    }

    QWidget w;
    QHBoxLayout l;
    w.setLayout(&l);

    QLabel lbl1;
    lbl1.setPixmap(pix);
    lbl1.setScaledContents(false);
    l.addWidget(&lbl1);

    QLabel lbl2;
    lbl2.setPixmap(pix);
    lbl2.setScaledContents(true);
    l.addWidget(&lbl2);

    w.show();
    return app.exec();
}