http://stackoverflow.com/questions/5960074/qimage-in-a-qgraphics-scene
http://stackoverflow.com/questions/17888795/how-to-use-qpainter-on-qpixmap
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http://stackoverflow.com/questions/5960074/qimage-in-a-qgraphics-scene
http://stackoverflow.com/questions/17888795/how-to-use-qpainter-on-qpixmap
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