From 4eeb96d5b664624262713918ced6dde577675bf6 Mon Sep 17 00:00:00 2001
From: max <maxi2003.eibl@gmail.com>
Date: Tue, 8 Sep 2026 23:05:49 +0200
Subject: [PATCH] fix(overlay): declare complete 64-bit ctypes prototypes for
 GDI/User32

---
 catser/overlay.py | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/catser/overlay.py b/catser/overlay.py
index bba73c9..9275d5a 100644
--- a/catser/overlay.py
+++ b/catser/overlay.py
@@ -26,6 +26,26 @@ user32 = ctypes.windll.user32
 gdi32 = ctypes.windll.gdi32
 kernel32 = ctypes.windll.kernel32
 
+# Set proper 64-bit argtypes and restype to prevent ctypes integer overflow
+user32.DefWindowProcW.argtypes = [wintypes.HWND, wintypes.UINT, wintypes.WPARAM, wintypes.LPARAM]
+user32.DefWindowProcW.restype = ctypes.c_longlong
+user32.GetDC.argtypes = [wintypes.HWND]
+user32.GetDC.restype = wintypes.HDC
+user32.ReleaseDC.argtypes = [wintypes.HWND, wintypes.HDC]
+user32.ReleaseDC.restype = ctypes.c_int
+user32.SetWindowPos.argtypes = [wintypes.HWND, ctypes.c_void_p, ctypes.c_int, ctypes.c_int, ctypes.c_int, ctypes.c_int, wintypes.UINT]
+user32.SetWindowPos.restype = wintypes.BOOL
+gdi32.CreateCompatibleDC.argtypes = [wintypes.HDC]
+gdi32.CreateCompatibleDC.restype = wintypes.HDC
+gdi32.DeleteDC.argtypes = [wintypes.HDC]
+gdi32.DeleteDC.restype = wintypes.BOOL
+gdi32.SelectObject.argtypes = [wintypes.HDC, wintypes.HGDIOBJ]
+gdi32.SelectObject.restype = wintypes.HGDIOBJ
+gdi32.DeleteObject.argtypes = [wintypes.HGDIOBJ]
+gdi32.DeleteObject.restype = wintypes.BOOL
+
+
+
 # Window styles
 WS_POPUP = 0x80000000
 WS_VISIBLE = 0x10000000
@@ -114,6 +134,30 @@ class WNDCLASSEXW(ctypes.Structure):
         ("hIconSm", wintypes.HICON),
     ]
 
+gdi32.CreateDIBSection.argtypes = [
+    wintypes.HDC,
+    ctypes.POINTER(BITMAPINFO),
+    wintypes.UINT,
+    ctypes.POINTER(ctypes.c_void_p),
+    wintypes.HANDLE,
+    wintypes.DWORD,
+]
+gdi32.CreateDIBSection.restype = wintypes.HBITMAP
+
+user32.UpdateLayeredWindow.argtypes = [
+    wintypes.HWND,
+    wintypes.HDC,
+    ctypes.POINTER(POINT),
+    ctypes.POINTER(SIZE),
+    wintypes.HDC,
+    ctypes.POINTER(POINT),
+    wintypes.COLORREF,
+    ctypes.POINTER(BLENDFUNCTION),
+    wintypes.DWORD,
+]
+user32.UpdateLayeredWindow.restype = wintypes.BOOL
+
+
 
 class OverlayWindow:
     """