Additional fixes for WSLg and Ubuntu 20.04

Author: Avasam

README.md

@@ -43,7 +43,8 @@ To understand how to use AutoSplit and how it works in-depth, please read the [t
 ### Compatibility
 
 - Windows 10 and 11.
-- Linux (still in early development) <!-- (Only tested on Ubuntu 22.04) -->
+- Linux (still in early development)
+  - Should work on Ubuntu 20.04+ (Only tested on Ubuntu 22.04)
   - Wayland is not currently supported
   - WSL2/WSLg requires an additional Desktop Environment, external X11 server, and/or systemd
 - Python 3.10+ (Not required for normal use. Refer to the [build instructions](/docs/build%20instructions.md) if you'd like run the application directly in Python).

scripts/install.ps1

@@ -34,8 +34,8 @@ $dev = If ($Env:GITHUB_JOB -eq 'Build') { '' } Else { '-dev' }
 If ($IsLinux) {
   If (-not $Env:GITHUB_JOB -or $Env:GITHUB_JOB -eq 'Build') {
     sudo apt-get update
-    # python3-tk for splash screen the rest for PySide6
-    sudo apt-get install -y python3-pip python3-tk libegl1 libxkbcommon0
+    # python3-tk for splash screen, libxcb-cursor-dev for QT_QPA_PLATFORM=xcb, the rest for PySide6
+    sudo apt-get install -y python3-pip python3-tk libxcb-cursor-dev libegl1 libxkbcommon0
     # having issues with npm for pyright, maybe let users take care of it themselves? (pyright from pip)
   }
 }
@@ -52,13 +52,6 @@ If ($IsLinux) {
 #          Even then, PyPI with Pillow>=7.2.0 will install 0.1.3 instead of 0.1.5
 &"$python" -m pip install PyAutoGUI "D3DShot>=0.1.5 ; sys_platform == 'win32'" --no-deps --upgrade
 
-# Because Ubuntu 22.04 is forced to use an older version of PySide6, we do a dirty typing patch
-# https://bugreports.qt.io/browse/QTBUG-114635
-If ($IsLinux) {
-  $libPath = &"$python" -c 'import PySide6 as _; print(_.__path__[0])'
-  (Get-Content "$libPath/QtWidgets.pyi").replace('-> Tuple:', '-> Tuple[str, ...]:') |
-    Set-Content "$libPath/QtWidgets.pyi"
-}
 # Uninstall optional dependencies if PyAutoGUI or D3DShot was installed outside this script
 # PyScreeze -> pyscreenshot -> mss deps call SetProcessDpiAwareness, used to be installed on Windows
 # Pillow, pygetwindow, pymsgbox, pytweening, MouseInfo are picked up by PySide6

src/AutoSplit.py

@@ -1,5 +1,6 @@
 #!/usr/bin/python3
 
+import os
 import sys
 
 # Prevent PyAutoGUI and pywinctl from setting Process DPI Awareness, which Qt tries to do then throws warnings about it.
@@ -15,14 +16,16 @@
     ctypes.windll.shcore.SetProcessDpiAwareness = (  # pyright: ignore[reportAttributeAccessIssue]
         lambda _: None  # pyright: ignore[reportUnknownLambdaType]
     )
+if sys.platform == "linux":
+    # Fixes "undefined symbol: wl_proxy_marshal_flags": https://bugreports.qt.io/browse/QTBUG-114635
+    os.environ.setdefault("QT_QPA_PLATFORM", "xcb")
 
-import os
 import signal
 from collections.abc import Callable
 from copy import deepcopy
 from time import time
 from types import FunctionType
-from typing import NoReturn, cast
+from typing import NoReturn
 
 import cv2
 from cv2.typing import MatLike
@@ -967,8 +970,7 @@ def set_preview_image(qlabel: QLabel, image: MatLike | None):
             capture = image
 
         qimage = QtGui.QImage(
-            # Try to update PySide6, see https://bugreports.qt.io/browse/QTBUG-114635
-            cast(bytes, capture.data) if sys.platform == "linux" else capture.data,
+            capture.data,
             width,
             height,
             width * channels,

src/region_selection.py

@@ -1,4 +1,3 @@
-import os
 import sys
 from math import ceil
 from typing import TYPE_CHECKING
@@ -8,6 +7,7 @@
 from cv2.typing import MatLike, Point
 from PySide6 import QtCore, QtGui, QtWidgets
 from PySide6.QtTest import QTest
+from pywinctl import getTopWindowAt
 from typing_extensions import override
 
 import error_messages
@@ -33,12 +33,6 @@
 if sys.platform == "linux":
     from Xlib.display import Display
 
-    # This variable may be missing in desktopless environment. x11 | wayland
-    os.environ.setdefault("XDG_SESSION_TYPE", "x11")
-
-# Must come after the linux XDG_SESSION_TYPE environment variable is set
-from pywinctl import getTopWindowAt
-
 if TYPE_CHECKING:
     from AutoSplit import AutoSplit