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How to get text scaling value in C++?

I am writing a OpenGL application in C++. I recently discovered that UI elements are very small on high-DPI displays. A bit of research indicates that there is a setting for text scaling factor, which scales up UI elements; how can I read this value from C++ to scale my UI?

Can you give more details? Which lib do you use for UI? OpenGL version?

I think you can find some good tips here: https://www.opengl.org/discussion_bo...ch-GDI-pt-size

Quote:

Originally Posted by manu-tm (Post 5311205)

Can you give more details? Which lib do you use for UI? OpenGL version?

I'm not using any libs for UI, it's written in raw OpenGL and uses X for window creation. I'm using OpenGL 3.

Quote:

Originally Posted by pan64 (Post 5311226)

I think you can find some good tips here: https://www.opengl.org/discussion_bo...ch-GDI-pt-size

As far as I can tell, all the answers there are Windows-specific (they use GDI to figure out the text scaling).