[cairo] Cairo/PNG shaked up.

[Hans Breuer]

While updateing my Cairo/Dia plug-in [1] I stumpled not only about
about lost convenience [2] (PNG output needs to be special cased now)
but also about Cairo apprently not respecting the scale of the output
anymore [3] or the image backend is missing some appropriate DPI default.

Am I doing something wrong?

Thanks,
     Hans

[1] htpp://hans.breuer.org/dia/dia-cairo.htm
[2] http://cvs.gnome.org/viewcvs/dia/plug-ins/cairo/diacairo.c?r1=1.13&r2=1.14
[3] http://hans.breuer.org/dia/render-test-shaked-up.png