Set gfn based on screen resolution

Is there a way to determine the screen resolution in gVim and act upon
that information, for example to set a different font size?

I seem to find myself working in two different modes: either on my
laptop or on a large screen. Maybe I'm getting old, or maybe the
distance to the screen is different between the two (I suspect I sit
closer to the laptop's screen), but I use Menlo:h11 on my laptop and
I'd like :h12 or even :h13 when I'm connected to the monitor.

Thank you!

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