QGraphicsWebView and Flash performance issue

bunjee

Greetings,

It seems that the performance of Flash is not as good in a QGraphicsWebView than in a QWebView.

I did a small test example to demonstrate this.

I'm running this on Windows 7 + Qt 4.7.1 on an i7 but I did reproduce it on OS-X :
@#include <QtGui/QApplication>

#include <QWebView>
#include <QGraphicsView>
#include <QGraphicsWebView>

static const QUrl URL = QUrl("http://www.warriorlabs.net/index.php?app=ccs&module=pages&section=pages&folder=/music&id=26");

static const int RESOLUTION_X = 1920;
static const int RESOLUTION_Y = 1200;

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

//---------------------------------------------------------------------------------------------
// Instructions :
//
// Start the video by clicking inside each web view.
//
// The QWebView is performing better than the QGraphicsWebView with the very same HTML.
//

//---------------------------------------------------------------------------------------------
// QWebView > Good performances

QWebView * view = new QWebView;
view->settings()->setAttribute(QWebSettings::PluginsEnabled, true);
view->setUrl(URL);

view->setFixedSize(RESOLUTION_X, RESOLUTION_Y);

view->setWindowTitle("WebView");
view->show();

//---------------------------------------------------------------------------------------------
// QGraphicsWebView > Slow performances

QGraphicsScene * scene = new QGraphicsScene();
QGraphicsView * graphicsView = new QGraphicsView(scene);

QGraphicsWebView * graphicsWebView = new QGraphicsWebView;
graphicsWebView->settings()->setAttribute(QWebSettings::PluginsEnabled, true);
graphicsWebView->setUrl(URL);
scene->addItem(graphicsWebView);

scene->setSceneRect(QRect(0, 0, RESOLUTION_X, RESOLUTION_Y));
graphicsWebView->resize(RESOLUTION_X, RESOLUTION_Y);


graphicsView->setFixedSize(RESOLUTION_X, RESOLUTION_Y);

graphicsView->setWindowTitle("GraphicsWebView");
graphicsView->show();

return a.exec(&#41;;

}@

Anyone knows why this happens ? Is this due to caching or graphical performances ?

I'm not 100% sure about this but it seems that if I load the QWebPage with the QGraphicsWebView and then switches it inside the QWebView I inherit the poor performances. Could this come from an external factor like QWebSettings ?

Thanks for your insights.

B.A.

micha4fun

I experienced the same problem. Does probably anyone have a workaround for this?

Best Regards,
Micha

bunjee

I guess we'll have to wait for Qt 4.8 and QtWebkit 2.2.

B.A.