In your QGraphicsView
Qt Code: 
  1. setRenderHints( QPainter::Antialiasing | QPainter::SmoothPixmapTransform );
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Qt Code: 
  1. new QGLWidget( QGLFormat( QGL::SampleBuffers | QGL::AlphaChannel | QGL::Rgba ) );
  2.  
  3. QGLFormat frm = wgt->format();
  4. frm.setSamples(4);
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