[QDirectFBPixmapData] Image format and color depth is not set in transformed()

    QPixmap pixmap1(50,50);
    pixmap1.fill(Qt::white);

    QPixmap pixmap2 = pixmap1.scaled(QSize(100,100));

    QPainter painter(&pixmap2);  // It raise ASSERT exception

  ASSERT: "false" in file ../plugins/gfxdrivers/directfb/qdirectfbscreen.cpp, line 872

int QDirectFBScreen::depth(QImage::Format format)
{
    int depth = 0;
    switch(format) {
    case QImage::Format_Invalid:
    case QImage::NImageFormats:
        Q_ASSERT(false);