Efficient way of displaying a continuous stream of QImages

Question

I am currently using a QLabel to do this, but this seems to be rather slow:

void Widget::sl_updateLiveStreamLabel(spImageHolder_t _imageHolderShPtr) //slot         


        

Answer 1

Setting up a QGraphicsView and QGraphicsScene is quite straight-forward: -

int main( int argc, char **argv )
{
    QApplication app(argc, argv);

    // Create the scene and set its dimensions
    QGraphicsScene scene;
    scene.setSceneRect( 0.0, 0.0, 400.0, 400.0 );

    // create an item that will hold an image
    QGraphicsPixmapItem *item = new QGraphicsPixmapItem(0);

    // load an image and set it to the pixmapItem
    QPixmap pixmap("pathToImage.png") // example filename pathToImage.png
    item->setPixmap(pixmap);

    // add the item to the scene
    scene.addItem(item);

    item->setPos(200,200); // set the item's position in the scene

    // create a view to look into the scene
    QGraphicsView view( &scene );
    view.setRenderHints( QPainter::Antialiasing );
    view.show();

    return app.exec();
}