How could an application know the desktop scale factor? 🔍

[Alberto Salvia Novella]

Is there any way an application could tell the current desktop scaling factor independently of the desktop environment in use?

For example Wayland has (https://wayland.freedesktop.org/docs/html/apa.html#protocol-spec-wl_output) and Mir has (https://unity.ubuntu.com/mir/struct_mir_display_output.html), which both could be used for telling the physical size of the output device. So you can tell how to scale your application interface to have a good size.

This is for solving bug (https://developer.blender.org/T48292).

Thanks in advance.

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