reactos/win32ss/user/ntuser/guicheck.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * PURPOSE:          GUI state check
   5  * FILE:             win32ss/user/ntuser/guicheck.c
   6  * PROGRAMER:        Casper S. Hornstrup (chorns@users.sourceforge.net)
   7  * NOTES:            The GuiCheck() function performs a few delayed operations:
   8  *                   1) A GUI process is assigned a window station
   9  *                   2) A message queue is created for a GUI thread before use
  10  *                   3) The system window classes are registered for a process
  11  */
  12
  13 #include <win32k.h>
  14
  15 /* GLOBALS *******************************************************************/
  16
  17 static LONG NrGuiAppsRunning = 0;
  18
  19 /* FUNCTIONS *****************************************************************/
  20
  21 static BOOL FASTCALL
  22 co_AddGuiApp(PPROCESSINFO W32Data)
  23 {
  24    W32Data->W32PF_flags |= W32PF_CREATEDWINORDC;
  25    if (InterlockedIncrement(&NrGuiAppsRunning) == 1)
  26    {
  27       BOOL Initialized;
  28
  29       Initialized = co_IntInitializeDesktopGraphics();
  30
  31       if (!Initialized)
  32       {
  33          W32Data->W32PF_flags &= ~W32PF_CREATEDWINORDC;
  34          InterlockedDecrement(&NrGuiAppsRunning);
  35          return FALSE;
  36       }
  37    }
  38    return TRUE;
  39 }
  40
  41 static void FASTCALL
  42 RemoveGuiApp(PPROCESSINFO W32Data)
  43 {
  44    W32Data->W32PF_flags &= ~W32PF_CREATEDWINORDC;
  45    if (InterlockedDecrement(&NrGuiAppsRunning) == 0)
  46    {
  47       IntEndDesktopGraphics();
  48    }
  49 }
  50
  51 BOOL FASTCALL
  52 co_IntGraphicsCheck(BOOL Create)
  53 {
  54    PPROCESSINFO W32Data;
  55
  56    W32Data = PsGetCurrentProcessWin32Process();
  57    if (Create)
  58    {
  59       if (! (W32Data->W32PF_flags & W32PF_CREATEDWINORDC) && ! (W32Data->W32PF_flags & W32PF_MANUALGUICHECK))
  60       {
  61          return co_AddGuiApp(W32Data);
  62       }
  63    }
  64    else
  65    {
  66       if ((W32Data->W32PF_flags & W32PF_CREATEDWINORDC) && ! (W32Data->W32PF_flags & W32PF_MANUALGUICHECK))
  67       {
  68          RemoveGuiApp(W32Data);
  69       }
  70    }
  71
  72    return TRUE;
  73 }
  74
  75 VOID
  76 FASTCALL
  77 co_IntUserManualGuiCheck(BOOL Create)
  78 {
  79    PPROCESSINFO W32Data = (PPROCESSINFO)PsGetCurrentProcessWin32Process();
  80    W32Data->W32PF_flags |= W32PF_MANUALGUICHECK;
  81
  82    if (Create)
  83    {
  84        co_AddGuiApp(W32Data);
  85    }
  86    else
  87    {
  88        RemoveGuiApp(W32Data);
  89    }
  90 }
  91
  92 /* EOF */