xref: /reactos/win32ss/user/ntuser/guicheck.c (revision 9393fc32) 
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
co_AddGuiApp(PPROCESSINFO W32Data)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
RemoveGuiApp(PPROCESSINFO W32Data)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
co_IntGraphicsCheck(BOOL Create)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
co_IntUserManualGuiCheck(BOOL Create)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 */
93