Fixed QT segmentation fault in QBitmap.fromData in GlyphEntry (#428)

It's a weird fix but other attempts lead to video corruption see ticket for details.

Tests started failing in CI so the QT_QPA_PLATFORM environment variable trick was required to avoid that.

bin/pyrdp-convert.py

@@ -63,6 +63,10 @@
     if not HAS_GUI and args.format == "mp4":
         sys.stderr.write("Error: MP4 conversion requires the full PyRDP installation.")
         sys.exit(1)
+    elif HAS_GUI and args.format == "mp4":
+        # Initialize QT because QBitmap will segfault without it (#378, #428)
+        from PySide2.QtWidgets import QApplication
+        app = QApplication()
 
     logging.basicConfig(level=logging.CRITICAL)
     logging.getLogger("scapy").setLevel(logging.ERROR)

test/integration.sh

@@ -21,6 +21,8 @@ else
 	PREPEND="coverage run --append bin/"
 fi
 
+export QT_QPA_PLATFORM=offscreen
+
 echo ===================================================
 echo pyrdp-player.py read a replay in headless mode test
 ${PREPEND}pyrdp-player.py --headless test/files/test_session.replay