text: /*
   * USER driver support
   *
   * Copyright 2000, 2005 Alexandre Julliard
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
   */
  
  #include <stdarg.h>
  #include <stdio.h>
  #include "windef.h"
  #include "winbase.h"
  #include "wingdi.h"
  #include "winuser.h"
  #include "wine/debug.h"
  #include "wine/gdi_driver.h"
  #include "wine/unicode.h"
  
  #include "user_private.h"
  #include "controls.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(user);
  WINE_DECLARE_DEBUG_CHANNEL(winediag);
  
  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[] = {
          '_','_','w','i','n','e','_','d','i','s','p','l','a','y','_',
          'd','e','v','i','c','e','_','g','u','i','d',0 };
      static const WCHAR key_pathW[] = {
          'S','y','s','t','e','m','\\',
          'C','u','r','r','e','n','t','C','o','n','t','r','o','l','S','e','t','\\',
          'C','o','n','t','r','o','l','\\',
          'V','i','d','e','o','\\','{',0};
      static const WCHAR displayW[] = {'}','\\','0','0','0','0',0};
      static const WCHAR driverW[] = {'G','r','a','p','h','i','c','s','D','r','i','v','e','r',0};
      HMODULE ret = 0;
      HKEY hkey;
      DWORD size;
      WCHAR path[MAX_PATH];
      WCHAR key[ARRAY_SIZE(key_pathW) + ARRAY_SIZE(displayW) + 40];
      UINT guid_atom = HandleToULong( GetPropW( hwnd, display_device_guid_propW ));
  
      USER_CheckNotLock();
  
      strcpy( driver_load_error, "The explorer process failed to start." );  /* default error */
  
      if (!guid_atom)
      {
          SendMessageW( hwnd, WM_NULL, 0, 0 );  /* wait for the desktop process to be ready */
          guid_atom = HandleToULong( GetPropW( hwnd, display_device_guid_propW ));
      }
      memcpy( key, key_pathW, sizeof(key_pathW) );
      if (!GlobalGetAtomNameW( guid_atom, key + strlenW(key), 40 )) return 0;
      strcatW( key, displayW );
      if (RegOpenKeyW( HKEY_LOCAL_MACHINE, key, &hkey )) return 0;
      size = sizeof(path);
      if (!RegQueryValueExW( hkey, driverW, NULL, NULL, (BYTE *)path, &size ))
      {
          if (!(ret = LoadLibraryW( path ))) ERR( "failed to load %s\n", debugstr_w(path) );
          TRACE( "%s %p\n", debugstr_w(path), ret );
      }
      else
      {
          size = sizeof(driver_load_error);
          RegQueryValueExA( hkey, "DriverError", NULL, NULL, (BYTE *)driver_load_error, &size );
      }
      RegCloseKey( hkey );
      return ret;
  }
  
  /* load the graphics driver */
  static const USER_DRIVER *load_driver(void)
  {
      void *ptr;
      HMODULE graphics_driver;
      USER_DRIVER *driver, *prev;
  
      driver = HeapAlloc( GetProcessHeap(), 0, sizeof(*driver) );
      *driver = null_driver;
  
      graphics_driver = load_desktop_driver( GetDesktopWindow() );
      if (graphics_driver)
      {
  #define GET_USER_FUNC(name) \
      do { if ((ptr = GetProcAddress( graphics_driver, #name ))) driver->p##name = ptr; } while(0)
  
          GET_USER_FUNC(ActivateKeyboardLayout);
          GET_USER_FUNC(Beep);
          GET_USER_FUNC(GetKeyNameText);
          GET_USER_FUNC(GetKeyboardLayout);
          GET_USER_FUNC(GetKeyboardLayoutList);
          GET_USER_FUNC(GetKeyboardLayoutName);
          GET_USER_FUNC(LoadKeyboardLayout);
          GET_USER_FUNC(MapVirtualKeyEx);
          GET_USER_FUNC(RegisterHotKey);
          GET_USER_FUNC(ToUnicodeEx);
          GET_USER_FUNC(UnloadKeyboardLayout);
          GET_USER_FUNC(UnregisterHotKey);
          GET_USER_FUNC(VkKeyScanEx);
          GET_USER_FUNC(DestroyCursorIcon);
          GET_USER_FUNC(SetCursor);
          GET_USER_FUNC(GetCursorPos);
          GET_USER_FUNC(SetCursorPos);
          GET_USER_FUNC(ClipCursor);
          GET_USER_FUNC(UpdateClipboard);
          GET_USER_FUNC(ChangeDisplaySettingsEx);
          GET_USER_FUNC(EnumDisplayMonitors);
          GET_USER_FUNC(EnumDisplaySettingsEx);
          GET_USER_FUNC(GetMonitorInfo);
          GET_USER_FUNC(CreateDesktopWindow);
          GET_USER_FUNC(CreateWindow);
          GET_USER_FUNC(DestroyWindow);
          GET_USER_FUNC(FlashWindowEx);
          GET_USER_FUNC(GetDC);
          GET_USER_FUNC(MsgWaitForMultipleObjectsEx);
          GET_USER_FUNC(ReleaseDC);
          GET_USER_FUNC(ScrollDC);
          GET_USER_FUNC(SetCapture);
          GET_USER_FUNC(SetFocus);
          GET_USER_FUNC(SetLayeredWindowAttributes);
          GET_USER_FUNC(SetParent);
          GET_USER_FUNC(SetWindowRgn);
          GET_USER_FUNC(SetWindowIcon);
          GET_USER_FUNC(SetWindowStyle);
          GET_USER_FUNC(SetWindowText);
          GET_USER_FUNC(ShowWindow);
          GET_USER_FUNC(SysCommand);
          GET_USER_FUNC(UpdateLayeredWindow);
          GET_USER_FUNC(WindowMessage);
          GET_USER_FUNC(WindowPosChanging);
          GET_USER_FUNC(WindowPosChanged);
          GET_USER_FUNC(SystemParametersInfo);
          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)
      {
          /* another thread beat us to it */
          HeapFree( GetProcessHeap(), 0, driver );
          driver = prev;
      }
      else LdrAddRefDll( 0, graphics_driver );
  
      __wine_set_display_driver( graphics_driver );
      register_builtin_classes();
  
      return driver;
  }
  
  /* unload the graphics driver on process exit */
  void USER_unload_driver(void)
  {
      USER_DRIVER *prev;
      /* make sure we don't try to call the driver after it has been detached */
      prev = InterlockedExchangePointer( (void **)&USER_Driver, &null_driver );
      if (prev != &lazy_load_driver && prev != &null_driver)
          HeapFree( GetProcessHeap(), 0, prev );
  }
  
  
  /**********************************************************************
   * Null user driver
   *
   * These are fallbacks for entry points that are not implemented in the real driver.
   */
  
  static HKL CDECL nulldrv_ActivateKeyboardLayout( HKL layout, UINT flags )
  {
      return 0;
  }
  
  static void CDECL nulldrv_Beep(void)
  {
  }
  
  static UINT CDECL nulldrv_GetKeyboardLayoutList( INT size, HKL *layouts )
  {
      HKEY hKeyKeyboard;
      DWORD rc;
      INT count = 0;
      ULONG_PTR baselayout;
      LANGID langid;
      static const WCHAR szKeyboardReg[] = {'S','y','s','t','e','m','\\','C','u','r','r','e','n','t','C','o','n','t','r','o','l','S','e','t','\\','C','o','n','t','r','o','l','\\','K','e','y','b','o','a','r','d',' ','L','a','y','o','u','t','s',0};
  
      baselayout = GetUserDefaultLCID();
      langid = PRIMARYLANGID(LANGIDFROMLCID(baselayout));
      if (langid == LANG_CHINESE || langid == LANG_JAPANESE || langid == LANG_KOREAN)
          baselayout = MAKELONG( baselayout, 0xe001 ); /* IME */
      else
          baselayout |= baselayout << 16;
  
      /* Enumerate the Registry */
      rc = RegOpenKeyW(HKEY_LOCAL_MACHINE,szKeyboardReg,&hKeyKeyboard);
      if (rc == ERROR_SUCCESS)
      {
          do {
              WCHAR szKeyName[9];
              HKL layout;
              rc = RegEnumKeyW(hKeyKeyboard, count, szKeyName, 9);
              if (rc == ERROR_SUCCESS)
              {
                  layout = (HKL)(ULONG_PTR)strtoulW(szKeyName,NULL,16);
                  if (baselayout != 0 && layout == (HKL)baselayout)
                      baselayout = 0; /* found in the registry do not add again */
                  if (size && layouts)
                  {
                      if (count >= size ) break;
                      layouts[count] = layout;
                  }
                  count ++;
              }
          } while (rc == ERROR_SUCCESS);
          RegCloseKey(hKeyKeyboard);
      }
  
      /* make sure our base layout is on the list */
      if (baselayout != 0)
      {
          if (size && layouts)
          {
              if (count < size)
              {
                  layouts[count] = (HKL)baselayout;
                  count++;
              }
          }
          else
              count++;
      }
  
      return count;
  }
  
  static INT CDECL nulldrv_GetKeyNameText( LONG lparam, LPWSTR buffer, INT size )
  {
      return 0;
  }
  
  static HKL CDECL nulldrv_GetKeyboardLayout( DWORD thread_id )
  {
      return 0;
  }
  
  static BOOL CDECL nulldrv_GetKeyboardLayoutName( LPWSTR name )
  {
      return FALSE;
  }
  
  static HKL CDECL nulldrv_LoadKeyboardLayout( LPCWSTR name, UINT flags )
  {
      return 0;
  }
  
  static UINT CDECL nulldrv_MapVirtualKeyEx( UINT code, UINT type, HKL layout )
  {
      return 0;
  }
  
  static BOOL CDECL nulldrv_RegisterHotKey( HWND hwnd, UINT modifiers, UINT vk )
  {
      return TRUE;
  }
  
  static INT CDECL nulldrv_ToUnicodeEx( UINT virt, UINT scan, const BYTE *state, LPWSTR str,
                                        int size, UINT flags, HKL layout )
  {
      return 0;
  }
  
  static BOOL CDECL nulldrv_UnloadKeyboardLayout( HKL layout )
  {
      return 0;
  }
  
  static void CDECL nulldrv_UnregisterHotKey( HWND hwnd, UINT modifiers, UINT vk )
  {
  }
  
  static SHORT CDECL nulldrv_VkKeyScanEx( WCHAR ch, HKL layout )
  {
      return -1;
  }
  
  static void CDECL nulldrv_DestroyCursorIcon( HCURSOR cursor )
  {
  }
  
  static void CDECL nulldrv_SetCursor( HCURSOR cursor )
  {
  }
  
  static BOOL CDECL nulldrv_GetCursorPos( LPPOINT pt )
  {
      return FALSE;
  }
  
  static BOOL CDECL nulldrv_SetCursorPos( INT x, INT y )
  {
      return FALSE;
  }
  
  static BOOL CDECL nulldrv_ClipCursor( LPCRECT clip )
  {
      return FALSE;
  }
  
  static void CDECL nulldrv_UpdateClipboard(void)
  {
  }
  
  static LONG CDECL nulldrv_ChangeDisplaySettingsEx( LPCWSTR name, LPDEVMODEW mode, HWND hwnd,
                                               DWORD flags, LPVOID lparam )
  {
      return DISP_CHANGE_FAILED;
  }
  
  static BOOL CDECL nulldrv_EnumDisplaySettingsEx( LPCWSTR name, DWORD num, LPDEVMODEW mode, DWORD flags )
  {
      return FALSE;
  }
  
  static BOOL CDECL nulldrv_CreateDesktopWindow( HWND hwnd )
  {
      return TRUE;
  }
  
  static BOOL CDECL nodrv_CreateWindow( HWND hwnd )
  {
      static int warned;
      HWND parent = GetAncestor( hwnd, GA_PARENT );
  
      /* HWND_MESSAGE windows don't need a graphics driver */
      if (!parent || parent == get_user_thread_info()->msg_window) return TRUE;
      if (warned++) return FALSE;
  
      ERR_(winediag)( "Application tried to create a window, but no driver could be loaded.\n" );
      if (driver_load_error[0]) ERR_(winediag)( "%s\n", driver_load_error );
      return FALSE;
  }
  
  static BOOL CDECL nulldrv_CreateWindow( HWND hwnd )
  {
      return TRUE;
  }
  
  static void CDECL nulldrv_DestroyWindow( HWND hwnd )
  {
  }
  
  static void CDECL nulldrv_FlashWindowEx( FLASHWINFO *info )
  {
  }
  
  static void CDECL nulldrv_GetDC( HDC hdc, HWND hwnd, HWND top_win, const RECT *win_rect,
                                   const RECT *top_rect, DWORD flags )
  {
  }
  
  static DWORD CDECL nulldrv_MsgWaitForMultipleObjectsEx( DWORD count, const HANDLE *handles, DWORD timeout,
                                                          DWORD mask, DWORD flags )
  {
      return WaitForMultipleObjectsEx( count, handles, flags & MWMO_WAITALL,
                                       timeout, flags & MWMO_ALERTABLE );
  }
  
  static void CDECL nulldrv_ReleaseDC( HWND hwnd, HDC hdc )
  {
  }
  
  static BOOL CDECL nulldrv_ScrollDC( HDC hdc, INT dx, INT dy, HRGN update )
  {
      RECT rect;
  
      GetClipBox( hdc, &rect );
      return BitBlt( hdc, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
                     hdc, rect.left - dx, rect.top - dy, SRCCOPY );
  }
  
  static void CDECL nulldrv_SetCapture( HWND hwnd, UINT flags )
  {
  }
  
  static void CDECL nulldrv_SetFocus( HWND hwnd )
  {
  }
  
  static void CDECL nulldrv_SetLayeredWindowAttributes( HWND hwnd, COLORREF key, BYTE alpha, DWORD flags )
  {
  }
  
  static void CDECL nulldrv_SetParent( HWND hwnd, HWND parent, HWND old_parent )
  {
  }
  
  static void CDECL nulldrv_SetWindowRgn( HWND hwnd, HRGN hrgn, BOOL redraw )
  {
  }
  
  static void CDECL nulldrv_SetWindowIcon( HWND hwnd, UINT type, HICON icon )
  {
  }
  
  static void CDECL nulldrv_SetWindowStyle( HWND hwnd, INT offset, STYLESTRUCT *style )
  {
  }
  
  static void CDECL nulldrv_SetWindowText( HWND hwnd, LPCWSTR text )
  {
  }
  
  static UINT CDECL nulldrv_ShowWindow( HWND hwnd, INT cmd, RECT *rect, UINT swp )
  {
      return swp;
  }
  
  static LRESULT CDECL nulldrv_SysCommand( HWND hwnd, WPARAM wparam, LPARAM lparam )
  {
      return -1;
  }
  
  static BOOL CDECL nulldrv_UpdateLayeredWindow( HWND hwnd, const UPDATELAYEREDWINDOWINFO *info,
                                                 const RECT *window_rect )
  {
      return TRUE;
  }
  
  static LRESULT CDECL nulldrv_WindowMessage( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
  {
      return 0;
  }
  
  static void CDECL nulldrv_WindowPosChanging( HWND hwnd, HWND insert_after, UINT swp_flags,
                                               const RECT *window_rect, const RECT *client_rect,
                                               RECT *visible_rect, struct window_surface **surface )
  {
  }
  
  static void CDECL nulldrv_WindowPosChanged( HWND hwnd, HWND insert_after, UINT swp_flags,
                                              const RECT *window_rect, const RECT *client_rect,
                                              const RECT *visible_rect, const RECT *valid_rects,
                                              struct window_surface *surface )
  {
  }
  
  static BOOL CDECL nulldrv_SystemParametersInfo( UINT action, UINT int_param, void *ptr_param, UINT flags )
  {
      return FALSE;
  }
  
  static void CDECL nulldrv_ThreadDetach( void )
  {
  }
  
  static USER_DRIVER null_driver =
  {
      /* keyboard functions */
      nulldrv_ActivateKeyboardLayout,
      nulldrv_Beep,
      nulldrv_GetKeyNameText,
      nulldrv_GetKeyboardLayout,
      nulldrv_GetKeyboardLayoutList,
      nulldrv_GetKeyboardLayoutName,
      nulldrv_LoadKeyboardLayout,
      nulldrv_MapVirtualKeyEx,
      nulldrv_RegisterHotKey,
      nulldrv_ToUnicodeEx,
      nulldrv_UnloadKeyboardLayout,
      nulldrv_UnregisterHotKey,
      nulldrv_VkKeyScanEx,
      /* cursor/icon functions */
      nulldrv_DestroyCursorIcon,
      nulldrv_SetCursor,
      nulldrv_GetCursorPos,
      nulldrv_SetCursorPos,
      nulldrv_ClipCursor,
      /* clipboard functions */
      nulldrv_UpdateClipboard,
      /* display modes */
      nulldrv_ChangeDisplaySettingsEx,
      nulldrv_EnumDisplayMonitors,
      nulldrv_EnumDisplaySettingsEx,
      nulldrv_GetMonitorInfo,
      /* windowing functions */
      nulldrv_CreateDesktopWindow,
      nulldrv_CreateWindow,
      nulldrv_DestroyWindow,
      nulldrv_FlashWindowEx,
      nulldrv_GetDC,
      nulldrv_MsgWaitForMultipleObjectsEx,
      nulldrv_ReleaseDC,
      nulldrv_ScrollDC,
      nulldrv_SetCapture,
      nulldrv_SetFocus,
      nulldrv_SetLayeredWindowAttributes,
      nulldrv_SetParent,
      nulldrv_SetWindowRgn,
      nulldrv_SetWindowIcon,
      nulldrv_SetWindowStyle,
      nulldrv_SetWindowText,
      nulldrv_ShowWindow,
      nulldrv_SysCommand,
      nulldrv_UpdateLayeredWindow,
      nulldrv_WindowMessage,
      nulldrv_WindowPosChanging,
      nulldrv_WindowPosChanged,
      /* system parameters */
      nulldrv_SystemParametersInfo,
      /* thread management */
      nulldrv_ThreadDetach
  };
  
  
  /**********************************************************************
   * Lazy loading user driver
   *
   * Initial driver used before another driver is loaded.
   * Each entry point simply loads the real driver and chains to it.
   */
  
  static HKL CDECL loaderdrv_ActivateKeyboardLayout( HKL layout, UINT flags )
  {
      return load_driver()->pActivateKeyboardLayout( layout, flags );
  }
  
  static void CDECL loaderdrv_Beep(void)
  {
      load_driver()->pBeep();
  }
  
  static INT CDECL loaderdrv_GetKeyNameText( LONG lparam, LPWSTR buffer, INT size )
  {
      return load_driver()->pGetKeyNameText( lparam, buffer, size );
  }
  
  static HKL CDECL loaderdrv_GetKeyboardLayout( DWORD thread_id )
  {
      return load_driver()->pGetKeyboardLayout( thread_id );
  }
  
  static UINT CDECL loaderdrv_GetKeyboardLayoutList( INT size, HKL *layouts )
  {
      return load_driver()->pGetKeyboardLayoutList( size, layouts );
  }
  
  static BOOL CDECL loaderdrv_GetKeyboardLayoutName( LPWSTR name )
  {
      return load_driver()->pGetKeyboardLayoutName( name );
  }
  
  static HKL CDECL loaderdrv_LoadKeyboardLayout( LPCWSTR name, UINT flags )
  {
      return load_driver()->pLoadKeyboardLayout( name, flags );
  }
  
  static UINT CDECL loaderdrv_MapVirtualKeyEx( UINT code, UINT type, HKL layout )
  {
      return load_driver()->pMapVirtualKeyEx( code, type, layout );
  }
  
  static BOOL CDECL loaderdrv_RegisterHotKey( HWND hwnd, UINT modifiers, UINT vk )
  {
      return load_driver()->pRegisterHotKey( hwnd, modifiers, vk );
  }
  
  static INT CDECL loaderdrv_ToUnicodeEx( UINT virt, UINT scan, const BYTE *state, LPWSTR str,
                                    int size, UINT flags, HKL layout )
  {
      return load_driver()->pToUnicodeEx( virt, scan, state, str, size, flags, layout );
  }
  
  static BOOL CDECL loaderdrv_UnloadKeyboardLayout( HKL layout )
  {
      return load_driver()->pUnloadKeyboardLayout( layout );
  }
  
  static void CDECL loaderdrv_UnregisterHotKey( HWND hwnd, UINT modifiers, UINT vk )
  {
      load_driver()->pUnregisterHotKey( hwnd, modifiers, vk );
  }
  
  static SHORT CDECL loaderdrv_VkKeyScanEx( WCHAR ch, HKL layout )
  {
      return load_driver()->pVkKeyScanEx( ch, layout );
  }
  
  static void CDECL loaderdrv_SetCursor( HCURSOR cursor )
  {
      load_driver()->pSetCursor( cursor );
  }
  
  static BOOL CDECL loaderdrv_GetCursorPos( LPPOINT pt )
  {
      return load_driver()->pGetCursorPos( pt );
  }
  
  static BOOL CDECL loaderdrv_SetCursorPos( INT x, INT y )
  {
      return load_driver()->pSetCursorPos( x, y );
  }
  
  static BOOL CDECL loaderdrv_ClipCursor( LPCRECT clip )
  {
      return load_driver()->pClipCursor( clip );
  }
  
  static void CDECL loaderdrv_UpdateClipboard(void)
  {
      load_driver()->pUpdateClipboard();
  }
  
  static LONG CDECL loaderdrv_ChangeDisplaySettingsEx( LPCWSTR name, LPDEVMODEW mode, HWND hwnd,
                                                       DWORD flags, LPVOID lparam )
  {
      return load_driver()->pChangeDisplaySettingsEx( name, mode, hwnd, flags, lparam );
  }
  
  static BOOL CDECL loaderdrv_EnumDisplayMonitors( HDC hdc, LPRECT rect, MONITORENUMPROC proc, LPARAM lp )
  {
      return load_driver()->pEnumDisplayMonitors( hdc, rect, proc, lp );
  }
  
  static BOOL CDECL loaderdrv_EnumDisplaySettingsEx( LPCWSTR name, DWORD num, LPDEVMODEW mode, DWORD flags )
  {
      return load_driver()->pEnumDisplaySettingsEx( name, num, mode, flags );
  }
  
  static BOOL CDECL loaderdrv_GetMonitorInfo( HMONITOR handle, LPMONITORINFO info )
  {
      return load_driver()->pGetMonitorInfo( handle, info );
  }
  
  static BOOL CDECL loaderdrv_CreateDesktopWindow( HWND hwnd )
  {
      return load_driver()->pCreateDesktopWindow( hwnd );
  }
  
  static BOOL CDECL loaderdrv_CreateWindow( HWND hwnd )
  {
      return load_driver()->pCreateWindow( hwnd );
  }
  
  static void CDECL loaderdrv_FlashWindowEx( FLASHWINFO *info )
  {
      load_driver()->pFlashWindowEx( info );
  }
  
  static void CDECL loaderdrv_GetDC( HDC hdc, HWND hwnd, HWND top_win, const RECT *win_rect,
                                     const RECT *top_rect, DWORD flags )
  {
      load_driver()->pGetDC( hdc, hwnd, top_win, win_rect, top_rect, flags );
  }
  
  static void CDECL loaderdrv_SetLayeredWindowAttributes( HWND hwnd, COLORREF key, BYTE alpha, DWORD flags )
  {
      load_driver()->pSetLayeredWindowAttributes( hwnd, key, alpha, flags );
  }
  
  static void CDECL loaderdrv_SetWindowRgn( HWND hwnd, HRGN hrgn, BOOL redraw )
  {
      load_driver()->pSetWindowRgn( hwnd, hrgn, redraw );
  }
  
  static BOOL CDECL loaderdrv_UpdateLayeredWindow( HWND hwnd, const UPDATELAYEREDWINDOWINFO *info,
                                                   const RECT *window_rect )
  {
      return load_driver()->pUpdateLayeredWindow( hwnd, info, window_rect );
  }
  
  static USER_DRIVER lazy_load_driver =
  {
      /* keyboard functions */
      loaderdrv_ActivateKeyboardLayout,
      loaderdrv_Beep,
      loaderdrv_GetKeyNameText,
      loaderdrv_GetKeyboardLayout,
      loaderdrv_GetKeyboardLayoutList,
      loaderdrv_GetKeyboardLayoutName,
      loaderdrv_LoadKeyboardLayout,
      loaderdrv_MapVirtualKeyEx,
      loaderdrv_RegisterHotKey,
      loaderdrv_ToUnicodeEx,
      loaderdrv_UnloadKeyboardLayout,
      loaderdrv_UnregisterHotKey,
      loaderdrv_VkKeyScanEx,
      /* cursor/icon functions */
      nulldrv_DestroyCursorIcon,
      loaderdrv_SetCursor,
      loaderdrv_GetCursorPos,
      loaderdrv_SetCursorPos,
      loaderdrv_ClipCursor,
      /* clipboard functions */
      loaderdrv_UpdateClipboard,
      /* display modes */
      loaderdrv_ChangeDisplaySettingsEx,
      loaderdrv_EnumDisplayMonitors,
      loaderdrv_EnumDisplaySettingsEx,
      loaderdrv_GetMonitorInfo,
      /* windowing functions */
      loaderdrv_CreateDesktopWindow,
      loaderdrv_CreateWindow,
      nulldrv_DestroyWindow,
      loaderdrv_FlashWindowEx,
      loaderdrv_GetDC,
      nulldrv_MsgWaitForMultipleObjectsEx,
      nulldrv_ReleaseDC,
      nulldrv_ScrollDC,
      nulldrv_SetCapture,
      nulldrv_SetFocus,
      loaderdrv_SetLayeredWindowAttributes,
      nulldrv_SetParent,
      loaderdrv_SetWindowRgn,
      nulldrv_SetWindowIcon,
      nulldrv_SetWindowStyle,
      nulldrv_SetWindowText,
      nulldrv_ShowWindow,
      nulldrv_SysCommand,
      loaderdrv_UpdateLayeredWindow,
      nulldrv_WindowMessage,
      nulldrv_WindowPosChanging,
      nulldrv_WindowPosChanged,
      /* system parameters */
      nulldrv_SystemParametersInfo,
      /* thread management */
      nulldrv_ThreadDetach
  };
  