subsys/win32k/ntuser/guicheck.c

   1  /* $Id$
   2  *
   3  * COPYRIGHT:        See COPYING in the top level directory
   4  * PROJECT:          ReactOS kernel
   5  * PURPOSE:          GUI state check
   6  * FILE:             subsys/win32k/ntuser/guicheck.c
   7  * PROGRAMER:        Casper S. Hornstrup (chorns@users.sourceforge.net)
   8  * NOTES:            The GuiCheck() function performs a few delayed operations:
   9  *                   1) A GUI process is assigned a window station
  10  *                   2) A message queue is created for a GUI thread before use
  11  *                   3) The system window classes are registered for a process
  12  * REVISION HISTORY:
  13  *       06-06-2001  CSH  Created
  14  */
  15
  16 /* INCLUDES ******************************************************************/
  17
  18 #include <ddk/ntddk.h>
  19 #include <napi/teb.h>
  20 #include <win32k/win32k.h>
  21 #include <include/guicheck.h>
  22 #include <include/msgqueue.h>
  23 #include <include/object.h>
  24 #include <napi/win32.h>
  25 #include <include/winsta.h>
  26
  27 #define NDEBUG
  28 #include <debug.h>
  29
  30 /* GLOBALS *******************************************************************/
  31
  32 static ULONG NrGuiApplicationsRunning = 0;
  33
  34 /* FUNCTIONS *****************************************************************/
  35
  36 VOID
  37 W32kGraphicsCheck(BOOL Create)
  38 {
  39   if (Create)
  40     {
  41       if (0 == NrGuiApplicationsRunning)
  42         {
  43           W32kInitializeDesktopGraphics();
  44         }
  45       NrGuiApplicationsRunning++;
  46     }
  47   else
  48     {
  49       if (0 < NrGuiApplicationsRunning)
  50         {
  51           NrGuiApplicationsRunning--;
  52         }
  53       if (0 == NrGuiApplicationsRunning)
  54         {
  55           W32kEndDesktopGraphics();
  56         }
  57     }
  58
  59 }
  60
  61 VOID
  62 W32kGuiCheck(VOID)
  63 {
  64   if (PsGetWin32Process() == NULL)
  65     {
  66       NTSTATUS Status;
  67
  68       PsCreateWin32Process(PsGetCurrentProcess());
  69
  70       InitializeListHead(&PsGetWin32Process()->ClassListHead);
  71       ExInitializeFastMutex(&PsGetWin32Process()->ClassListLock);
  72
  73       Status =
  74         ValidateWindowStationHandle(PROCESS_WINDOW_STATION(),
  75                                     UserMode,
  76                                     GENERIC_ALL,
  77                                     &PsGetWin32Process()->WindowStation);
  78       if (!NT_SUCCESS(Status))
  79         {
  80           DbgPrint("W32K: Failed to reference a window station for "
  81                    "process.\n");
  82         }
  83     }
  84
  85   if (PsGetWin32Thread() == NULL)
  86     {
  87       NTSTATUS Status;
  88
  89       PsCreateWin32Thread(PsGetCurrentThread());
  90       PsGetWin32Thread()->MessageQueue = MsqCreateMessageQueue();
  91       InitializeListHead(&PsGetWin32Thread()->WindowListHead);
  92       ExInitializeFastMutex(&PsGetWin32Thread()->WindowListLock);
  93
  94       /* By default threads get assigned their process's desktop. */
  95       PsGetWin32Thread()->Desktop = NULL;
  96       Status = ObReferenceObjectByHandle(PsGetCurrentProcess()->Win32Desktop,
  97                                          GENERIC_ALL,
  98                                          ExDesktopObjectType,
  99                                          UserMode,
 100                                          (PVOID*)&PsGetWin32Thread()->Desktop,
 101                                          NULL);
 102       if (!NT_SUCCESS(Status))
 103         {
 104           DbgPrint("W32K: Failed to reference a desktop for thread.\n");
 105         }
 106     }
 107 }
 108
 109 /* EOF */