Jacek Caban : user32: Allow creating windows using null driver for invisible winstations.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: af4294a9af1b5b9f9ee7f3fa7561b6ade6e5ac05
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=af4294a9af1b5b9f9ee7f3fa75...

Author: Jacek Caban 
Date:   Thu Feb  9 15:12:58 2017 +0100

user32: Allow creating windows using null driver for invisible winstations.

Signed-off-by: Jacek Caban 
Signed-off-by: Alexandre Julliard

---

dlls/user32/driver.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/dlls/user32/driver.c b/dlls/user32/driver.c
index c4cbb8a..d59a2ea 100644
--- a/dlls/user32/driver.c
+++ b/dlls/user32/driver.c
@@ -39,6 +39,8 @@ static USER_DRIVER null_driver, lazy_load_driver;
 const USER_DRIVER *USER_Driver = &lazy_load_driver;
 static char driver_load_error[80];

+static BOOL CDECL nodrv_CreateWindow( HWND hwnd );
+
 static HMODULE load_desktop_driver( HWND hwnd )
 {
     static const WCHAR display_device_guid_propW[] = {
@@ -152,6 +154,16 @@ static const USER_DRIVER *load_driver(void)
         GET_USER_FUNC(ThreadDetach);
 #undef GET_USER_FUNC
     }
+    else
+    {
+        USEROBJECTFLAGS flags;
+        HWINSTA winstation;
+
+        winstation = GetProcessWindowStation();
+        if (!GetUserObjectInformationA(winstation, UOI_FLAGS, &flags, sizeof(flags), NULL)
+            || (flags.dwFlags & WSF_VISIBLE))
+            driver->pCreateWindow = nodrv_CreateWindow;
+    }

prev = InterlockedCompareExchangePointer( (void **)&USER_Driver, driver, &lazy_load_driver );
     if (prev != &lazy_load_driver)
@@ -360,7 +372,7 @@ static BOOL CDECL nulldrv_CreateDesktopWindow( HWND hwnd )
     return TRUE;
 }

-static BOOL CDECL nulldrv_CreateWindow( HWND hwnd )
+static BOOL CDECL nodrv_CreateWindow( HWND hwnd )
 {
     static int warned;
     HWND parent = GetAncestor( hwnd, GA_PARENT );
@@ -374,6 +386,11 @@ static BOOL CDECL nulldrv_CreateWindow( HWND hwnd )
     return FALSE;
 }

+static BOOL CDECL nulldrv_CreateWindow( HWND hwnd )
+{
+    return TRUE;
+}
+
 static void CDECL nulldrv_DestroyWindow( HWND hwnd )
 {
 }