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Asked: 2026-05-14T05:39:18+00:00

I need to know active screen DPI on Linux and Mac OS. I think

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I need to know active screen DPI on Linux and Mac OS. I think on linux xlib might be useful, but I can’t find a way how to get currect DPI.
I want this information to get real screen size in inches.

Thanks in advance!

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1 Answer

  1. Editorial Team

    In X on Linux, call XOpenDisplay() to get the Display, then use DisplayWidthMM() and DisplayHeightMM() together with DisplayWidth() and DisplayHeight() to compute the DPI.

    On the Mac, there’s almost certainly a more native API to use than X. Mac OS X does not run X Window by default, it has a native windowing environment.

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