Right now we scale externally, by supplying the contents scale (aka frame scale in WebCore terminology) and the device scale directly to our raster engine (cairo_t, QPainter for Qt) instead of letting WebCore handle this like Chrome and Mac ports are doing it. We should switch so that we align more with other ports, use more common code and gain the advantages of this approach.
cc'ing Mikhail as he is looking into this
*** This bug has been marked as a duplicate of bug 105978 ***