What does DisplayServer.screen_get_scale() actually get?

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Godot Version

4.4.1 stable

Question

I’m trying to calculate the true usable screen width translated into the world (on mobile).
I can successfully calculate it using:
DisplayServer.screen_get_usable_rect().end.x / camera.zoom.x * DisplayServer.screen_get_scale()

BUT if my screen is in portrait mode, using get_screen_scale throws the calculation off. So I have to use
DisplayServer.screen_get_usable_rect().end.x / camera.zoom.x

on my google pixel 4, screen_get_scale() returns the following values depending on the device orientation:
portrait: 1.35000002384186
landscape: 1.79999995231628

I assumed from the docs that it returned some value related to pixel density, but I suppose I am mistaken. I have two questions:

  1. What does DisplayServer.screen_get_scale() actually get?
  2. Why does my formula require me to ignore it if my phone is in portrait mode?
2

Looks like it takes the screen width and height also into account godot/platform/android/display_server_android.cpp at 4d7c448a0a58ff4b14d4a06c4b1bb387b58f4508 · godotengine/godot · GitHub which will change depending on orientation.

Not sure where the problem is though.

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