[jimtabor] 29035: - Setting up for the User32 part of the win32k rewrite. - Pass window handle and pointer to the current teb callback. This will allow easy and fast read access for user space programs. - Next will be ValidateHwnd and the rest. - https://www.microsoft.com/msj/0397/hood/hood0397.aspx - http://www.winterdom.com/dev/ui/wnd.html - http://www.mvps.org/user32/modal.html - http://www.tech-archive.net/Archive/Development/microsoft.public.win32.programmer.kernel/2006-05/msg00522.html

Author: jimtabor
Date: Fri Sep 14 19:34:41 2007
New Revision: 29035

URL: http://svn.reactos.org/svn/reactos?rev=29035&view=rev
Log:
- Setting up for the User32 part of the win32k rewrite.
- Pass window handle and pointer to the current teb callback. This will allow easy and
fast read access for user space programs.
- Next will be ValidateHwnd and the rest.
- https://www.microsoft.com/msj/0397/hood/hood0397.aspx
- http://www.winterdom.com/dev/ui/wnd.html
- http://www.mvps.org/user32/modal.html
-
http://www.tech-archive.net/Archive/Development/microsoft.public.win32.prog…

Modified:
    trunk/reactos/subsystems/win32/win32k/ntuser/callback.c

Modified: trunk/reactos/subsystems/win32/win32k/ntuser/callback.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/nt…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/ntuser/callback.c (original)
+++ trunk/reactos/subsystems/win32/win32k/ntuser/callback.c Fri Sep 14 19:34:41 2007
@@ -106,6 +106,34 @@
    }
 }
 
+
+//
+// Pass the Current Window handle and pointer to the Client Callback.
+// This will help user space programs speed up read access with the window object.
+//
+static VOID
+IntSetTebWndCallback (HWND * hWnd, PVOID * pWnd)
+{
+  HWND hWndS = *hWnd;
+  PWINDOW_OBJECT Window = UserGetWindowObject(*hWnd);
+  PTEB Teb = NtCurrentTeb();
+
+  *hWnd = Teb->Win32ClientInfo.hWND;
+  *pWnd = Teb->Win32ClientInfo.pvWND;
+
+  Teb->Win32ClientInfo.hWND  = hWndS;
+  Teb->Win32ClientInfo.pvWND = (PVOID) Window;
+}
+
+static VOID
+IntRestoreTebWndCallback (HWND hWnd, PVOID pWnd)
+{
+  PTEB Teb = NtCurrentTeb();
+
+  Teb->Win32ClientInfo.hWND  = hWnd;
+  Teb->Win32ClientInfo.pvWND = pWnd;
+}
+
 /* FUNCTIONS *****************************************************************/
 
 VOID STDCALL
@@ -116,7 +144,7 @@
                               LRESULT Result)
 {
    SENDASYNCPROC_CALLBACK_ARGUMENTS Arguments;
-   PVOID ResultPointer;
+   PVOID ResultPointer, pWnd;
    ULONG ResultLength;
    NTSTATUS Status;
 
@@ -126,6 +154,8 @@
    Arguments.Context = CompletionCallbackContext;
    Arguments.Result = Result;
 
+   IntSetTebWndCallback (&hWnd, &pWnd);
+
    UserLeaveCo();
 
    Status = KeUserModeCallback(USER32_CALLBACK_SENDASYNCPROC,
@@ -135,6 +165,8 @@
                                &ResultLength);
 
    UserEnterCo();
+
+   IntRestoreTebWndCallback (hWnd, pWnd);
 
    if (!NT_SUCCESS(Status))
    {
@@ -155,7 +187,7 @@
    WINDOWPROC_CALLBACK_ARGUMENTS StackArguments;
    PWINDOWPROC_CALLBACK_ARGUMENTS Arguments;
    NTSTATUS Status;
-   PVOID ResultPointer;
+   PVOID ResultPointer, pWnd;
    ULONG ResultLength;
    ULONG ArgumentLength;
    LRESULT Result;
@@ -187,6 +219,8 @@
    ResultPointer = NULL;
    ResultLength = ArgumentLength;
 
+   IntSetTebWndCallback (&Wnd, &pWnd);
+
    UserLeaveCo();
 
    Status = KeUserModeCallback(USER32_CALLBACK_WINDOWPROC,
@@ -207,6 +241,8 @@
    _SEH_END;
 
    UserEnterCo();
+
+   IntRestoreTebWndCallback (Wnd, pWnd);
 
    if (!NT_SUCCESS(Status))
    {