GLFW Window is too big if wayland monitor is scaled about glfw

[elmindreda]

This may be a bug in GLFW or Hyprland. Do you have libdecor installed? What is the output of wayland-info in that environment?

[enesaltinkaya]

Hi, yes libdecor is installed.

[enes@redmi ~] $ pacman -Q libdecor
libdecor 0.2.2 -

I have kde-plasma installed right now besides hyprland, so i tried that, result was the same.

wayland-info hyprland, https://pastebin.com/rsVZNqvZ
wayland-info kde-plasma, https://pastebin.com/06M8vqWF

Also i printed out values from glfwGetFramebufferSize and glfwGetWindowSize like this;
Same output for kde-plasma and hyprland.

int windowWidth, windowHeight;
int frameBufferWidth, frameBufferHeight;
while (!glfwWindowShouldClose(window)) {
  ... 
  glfwGetFramebufferSize(window, &frameBufferWidth, &frameBufferHeight);
  glfwGetWindowSize(window, &windowWidth, &windowHeight);
  printf("fb:%d %d window:%d %d\n", frameBufferWidth, frameBufferHeight, windowWidth, windowHeight);
  ...
}

fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080

And this output is from hyprctl clients when running on hyprland;
It says "size: 1920,1080" but it covers the whole screen :S

Window 57227fbf74a0 -> Ales:
	mapped: 1
	hidden: 0
	at: 0,0
	size: 1920,1080
	workspace: 3 (3)
	floating: 1
	monitor: 0
	class: 
	title: Ales
	initialClass: 
	initialTitle: Ales
	pid: 80209
	xwayland: 0
	pinned: 0
	fullscreen: 0
	fullscreenmode: 0
	fakefullscreen: 0
	grouped: 0
	swallowing: 0
	focusHistoryID: 2

[elmindreda]

Also i printed out values from glfwGetFramebufferSize and glfwGetWindowSize like this; Same output for kde-plasma and hyprland.

fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080
fb : 3840 2160 window : 1920 1080

And this output is from hyprctl clients when running on hyprland; It says "size: 1920,1080" but it covers the whole screen :S

Window 57227fbf74a0 -> Ales:
	size: 1920,1080

That does look like it's a bug in Hyprland. What does GLFW say the window content scale is?

[enesaltinkaya]

  float windowScaleX, windowScaleY;
  float monitorScaleX, monitorScaleY;

  while (!glfwWindowShouldClose(window)) {
    ...
    glfwGetMonitorContentScale(glfwGetPrimaryMonitor(), &monitorScaleX, &monitorScaleY);
    glfwGetWindowContentScale(window, &windowScaleX, &windowScaleY);
    printf("monitorScale:%f %f windowScale:%f %f\n", monitorScaleX, monitorScaleY, windowScaleX, windowScaleY);
    ...
  }

monitorScale:2.000000 2.000000 windowScale:2.000000 2.000000
monitorScale:2.000000 2.000000 windowScale:2.000000 2.000000
monitorScale:2.000000 2.000000 windowScale:2.000000 2.000000
monitorScale:2.000000 2.000000 windowScale:2.000000 2.000000
monitorScale:2.000000 2.000000 windowScale:2.000000 2.000000

This looks correct.

[elmindreda]

Thank you! This looks to me very much like a compositor bug, in which case there's nothing GLFW can do or even any way to find out it's happening.

[enesaltinkaya]

Alright. For now I'll compile glfw with only X11 support and work with Xwayland. Thanks.