QS60Pixmap and QS60PaintEngine have confusing and in fact wrong names, originating from the days of targetting S60 3.x and 5.0. In the S^3 world these are the Symbian-specific raster pixmap and paint engine implementations which are only used in certain situations (e.g. when painting into a pixmap or image, or forcing the raster graphics system for the app). With
QTBUG-19880 QS60PaintEngine is now used as the paint engine for QImage too, therefore some renaming has to be done to avoid further confusion: QS60Pixmap -> QSymbianRasterPixmap, QS60PaintEngine -> QSymbianRasterPaintEngine.
This is a long pending task since the introduction of additional graphics systems on Symbian (OpenVG, OpenGL).