Qpixmap blurs when using opengl viewport in QGraphicsview

**wagmare** · 30th September 2013, 09:01

hi friends,

I have used QPixmap Item to display the images in QGraphicsview viewport
as im loading thousands of pixmaps at a time , i decided to set some options to make cache for the pixmap im loading for the images .
so i did

Qt Code:

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View->scene()->setItemIndexMethod(QGraphicsScene::NoIndex);
    View->setRenderHint(QPainter::Antialiasing, false);
 
    QGLFormat fmt;
    fmt.setSampleBuffers(true);
    fmt.setSamples(2);
    //View->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
     View->setViewport(new QGLWidget(fmt));
 
    View->setOptimizationFlags(QGraphicsView::DontSavePainterState | QGraphicsView::DontAdjustForAntialiasing);
    View->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
 View->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
 
    View->setCacheMode(QGraphicsView::CacheBackground);

View->scene()->setItemIndexMethod(QGraphicsScene::NoIndex);
    View->setRenderHint(QPainter::Antialiasing, false);

    QGLFormat fmt;
    fmt.setSampleBuffers(true);
    fmt.setSamples(2);
    //View->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
     View->setViewport(new QGLWidget(fmt));

    View->setOptimizationFlags(QGraphicsView::DontSavePainterState | QGraphicsView::DontAdjustForAntialiasing);
    View->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
 View->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);

    View->setCacheMode(QGraphicsView::CacheBackground);

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if i dont use QGLWidget and Opengl as viewport of QGraphicsVIew the pixmaps are looking normal but if i use OpenGL Viewport ,the rendered pixmaps are looking blurred than normal .
i attached the screenshots of bot cases with the thread .
please help me

..withOpenGL.jpg and with opt open gl
wtOutOpenGL.jpg