Renderers (and Windows scaling)

Processing
3

Solution on my system with Windows 10 and Windows Scaling = 125% :

DPI Renderer Scaling Override for JAVA2D

This is a workaround on my system for fullscreen(P2D) :

/*
 * Fullscreen P2D Workaround
 *
 * Author:      glv
 * Date:        2025-11-09
 *
*/

static 
  {
  // Forces 1:1 pixel rendering by disabling OS-level DPI scaling
  
  System.setProperty("sun.java2d.uiScale", "1.01"); // If this is 1.0 it does NOT work!
  //System.setProperty("sun.java2d.DPIscaling", "false"); // No effect.
  }

void setup() 
  {
  //size(1920, 1200, P2D);
  
  fullScreen(P2D, 2);      // 0 is span, 1 is monitor 1, 2 is monitor 2
  println(SPAN);
  println(width, height);
  //surface.setLocation(50, 50); // Does NOT work with monitor 2 and will go to monitor 1!
  }

void draw() 
  {
  // Helps to see the size of the screen:  
  circle(50, 50,  50);
  circle(width-50, 50,  50);
  circle(width-50, height-50,  50);
  circle(50, height-50,  50); 
  circle(width/2, height/2, 50); 
  }

I came across this quite accidentally exploring this a few days ago!
It has to be at least one pixel off to work and you will see this in the println(width, height); output.

:)