Gtk::Image and HiDPI

[Kasper Peeters <kasper peeters phi-sci com>]

When I set the content of a Gtk::Image from a pixbuf, gtk seems to be
scaling up the visible size by the HiDPI scale factor. That is, if I
feed it a pixbuf of 100x100 pixels, on a screen with scale factor 2, it
will be upscaled to cover 200x200 device pixels, making it blocky.

Is there any way in which I can tell gtk not to do that, so that when I
feed it a 200x200 image, it will actually draw it at 200x200 device
pixels, not 400x400 device pixels?

Thanks,
Kasper