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Handle NULL window as special case when computing visible region for GetDC.

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Fixes bug #59

svn path=/trunk/; revision=8006
This commit is contained in:
Gé van Geldorp 2004-02-02 23:28:17 +00:00
parent 51612d040b
commit 70a9c9cdf0
1 changed files with 16 additions and 2 deletions
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18
reactos/subsys/win32k/ntuser/windc.c
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@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: windc.c,v 1.52 2004/02/02 22:09:05 gvg Exp $
/* $Id: windc.c,v 1.53 2004/02/02 23:28:17 gvg Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -232,6 +232,7 @@ DceUpdateVisRgn(DCE *Dce, PWINDOW_OBJECT Window, ULONG Flags)
{
HANDLE hRgnVisible = NULL;
ULONG DcxFlags;
PWINDOW_OBJECT DesktopWindow;
if (Flags & DCX_PARENTCLIP)
{
@ -260,9 +261,22 @@ DceUpdateVisRgn(DCE *Dce, PWINDOW_OBJECT Window, ULONG Flags)
hRgnVisible = NtGdiCreateRectRgn(0, 0, 0, 0);
}
}
else if (NULL == Window)
{
DesktopWindow = IntGetWindowObject(IntGetDesktopWindow());
if (NULL != DesktopWindow)
{
hRgnVisible = UnsafeIntCreateRectRgnIndirect(&DesktopWindow->WindowRect);
IntReleaseWindowObject(DesktopWindow);
}
else
{
hRgnVisible = NULL;
}
}
else
{
hRgnVisible = DceGetVisRgn(NULL != Window ? Window->Self : NULL, Flags, 0, 0);
hRgnVisible = DceGetVisRgn(Window->Self, Flags, 0, 0);
}
if (0 != (Flags & DCX_INTERSECTRGN))