Window creation does not properly handle UI scaling on Linux Mint

[rmheuer]

When creating the sketch window, it is not created with the correct size if the system UI scale is set to something other than 100% (for example 2x scale on high-DPI displays).

To reproduce, set system UI scale to 200%, then run the following:

import processing.core.PApplet;
public class SizeCheck extends PApplet {
  @Override
  public void settings() {
    size(800, 800, P2D);
  }

  @Override
  public void setup() {
    println(width + " x " + height);
  }

  public static void main(String[] args) {
    PApplet.main(SizeCheck.class);
  }
}

With libp5x, this results in a 400x400 window and outputs:

The sketch has been automatically resized to fit the screen resolution
OpenGL error 1280 at bot beginDraw(): invalid enumerant
400 x 400

Standard Processing 4 does not have this issue, and correctly creates an 800x800 window, so I'm guessing it's due to using GLFW for window creation here instead of JOGL.

Platform:
OS: Linux Mint 22.1 Cinnamon 64-bit
Java: openjdk version "21.0.8" 2025-07-15
OpenGL vendor: Intel
OpenGL renderer: Mesa Intel(R) UHD Graphics (CML GT2)
OpenGL version: 4.6 (Core Profile) Mesa 25.0.7-0ubuntu0.24.04.2
GLSL version: 4.60

[neilcsmith-net]

Standard Processing 4 does not have this issue, and correctly creates an 800x800 window, so I'm guessing it's due to using GLFW for window creation here instead of JOGL.

Well, it's due to a deliberate decision to not use GLFW's support for scaling. It should still be creating an 800x800 pixel sketch. A contribution to optionally enable scaling would be welcomed. Needs proper testing from someone with the requisite system.