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reactos/subsystems/win32/win32k/ntuser/monitor.c
Jérôme Gardou 4553986560 Sync with trunk (r48008) 
Bets are open : will this break anything?

svn path=/branches/reactos-yarotows/; revision=48024
2010-07-13 17:46:03 +00:00

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/*
* ReactOS W32 Subsystem
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 ReactOS Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* PURPOSE: Monitor support
* FILE: subsys/win32k/ntuser/monitor.c
* PROGRAMER: Anich Gregor (blight@blight.eu.org)
* REVISION HISTORY:
* 26-02-2004 Created
*/
/* INCLUDES ******************************************************************/
#include <win32k.h>
/* FIXME: find include file for these */
#define MONITORINFOF_PRIMARY 1
#define MONITOR_DEFAULTTONULL 0
#define MONITOR_DEFAULTTOPRIMARY 1
#define MONITOR_DEFAULTTONEAREST 2
#define NDEBUG
#include <debug.h>
/* GLOBALS *******************************************************************/
/* list of monitors */
static PMONITOR gMonitorList = NULL;
/* INITALIZATION FUNCTIONS ****************************************************/
NTSTATUS
InitMonitorImpl()
{
DPRINT("Initializing monitor implementation...\n");
return STATUS_SUCCESS;
}
NTSTATUS
CleanupMonitorImpl()
{
DPRINT("Cleaning up monitor implementation...\n");
/* FIXME: Destroy monitor objects? */
return STATUS_SUCCESS;
}
/* PRIVATE FUNCTIONS **********************************************************/
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#ifndef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef ABS
# define ABS(a) ((a) < (0) ? (-(a)) : (a))
#endif
/* IntCreateMonitorObject
*
* Creates a MONITOR
*
* Return value
* If the function succeeds a pointer to a MONITOR is returned. On failure
* NULL is returned.
*/
static
PMONITOR
IntCreateMonitorObject()
{
HANDLE Handle;
PMONITOR Monitor;
Monitor = UserCreateObject(gHandleTable, NULL, &Handle, otMonitor, sizeof (MONITOR));
if (Monitor == NULL)
{
return NULL;
}
ExInitializeFastMutex(&Monitor->Lock);
return Monitor;
}
/* IntDestroyMonitorObject
*
* Destroys a MONITOR
* You have to be the owner of the monitors lock to safely destroy it.
*
* Arguments
*
* pMonitor
* Pointer to the MONITOR which shall be deleted
*/
static
void
IntDestroyMonitorObject(IN PMONITOR pMonitor)
{
RtlFreeUnicodeString(&pMonitor->DeviceName);
UserDereferenceObject(pMonitor);
}
PMONITOR FASTCALL
UserGetMonitorObject(IN HMONITOR hMonitor)
{
PMONITOR Monitor;
if (!hMonitor)
{
SetLastWin32Error(ERROR_INVALID_MONITOR_HANDLE);
return NULL;
}
Monitor = (PMONITOR)UserGetObject(gHandleTable, hMonitor, otMonitor);
if (!Monitor)
{
SetLastWin32Error(ERROR_INVALID_MONITOR_HANDLE);
return NULL;
}
ASSERT(Monitor->head.cLockObj >= 0);
return Monitor;
}
/* IntAttachMonitor
*
* Creates a new MONITOR and appends it to the list of monitors.
*
* Arguments
*
* pGdiDevice Pointer to the PDEVOBJ onto which the monitor was attached
* DisplayNumber Display Number (starting with 0)
*
* Return value
* Returns a NTSTATUS
*/
NTSTATUS
IntAttachMonitor(IN PDEVOBJ *pGdiDevice,
IN ULONG DisplayNumber)
{
PMONITOR Monitor;
WCHAR Buffer[CCHDEVICENAME];
DPRINT("Attaching monitor...\n");
/* create new monitor object */
Monitor = IntCreateMonitorObject();
if (Monitor == NULL)
{
DPRINT("Couldnt create monitor object\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
_snwprintf(Buffer, CCHDEVICENAME, L"\\\\.\\DISPLAY%d", DisplayNumber + 1);
if (!RtlCreateUnicodeString(&Monitor->DeviceName, Buffer))
{
DPRINT("Couldn't duplicate monitor name!\n");
UserDereferenceObject(Monitor);
UserDeleteObject(UserHMGetHandle(Monitor), otMonitor);
return STATUS_INSUFFICIENT_RESOURCES;
}
Monitor->GdiDevice = pGdiDevice;
Monitor->rcMonitor.left = 0;
Monitor->rcMonitor.top = 0;
Monitor->rcMonitor.right = Monitor->rcMonitor.left + pGdiDevice->gdiinfo.ulHorzRes;
Monitor->rcMonitor.bottom = Monitor->rcMonitor.top + pGdiDevice->gdiinfo.ulVertRes;
Monitor->rcWork = Monitor->rcMonitor;
Monitor->cWndStack = 0;
Monitor->hrgnMonitor = IntSysCreateRectRgnIndirect( &Monitor->rcMonitor );
IntGdiSetRegionOwner(Monitor->hrgnMonitor, GDI_OBJ_HMGR_PUBLIC);
if (gMonitorList == NULL)
{
DPRINT("Primary monitor is beeing attached\n");
Monitor->IsPrimary = TRUE;
gMonitorList = Monitor;
}
else
{
PMONITOR p;
DPRINT("Additional monitor is beeing attached\n");
for (p = gMonitorList; p->Next != NULL; p = p->Next)
{
p->Next = Monitor;
}
Monitor->Prev = p;
}
return STATUS_SUCCESS;
}
/* IntDetachMonitor
*
* Deletes a MONITOR and removes it from the list of monitors.
*
* Arguments
*
* pGdiDevice Pointer to the PDEVOBJ from which the monitor was detached
*
* Return value
* Returns a NTSTATUS
*/
NTSTATUS
IntDetachMonitor(IN PDEVOBJ *pGdiDevice)
{
PMONITOR Monitor;
for (Monitor = gMonitorList; Monitor != NULL; Monitor = Monitor->Next)
{
if (Monitor->GdiDevice == pGdiDevice)
break;
}
if (Monitor == NULL)
{
/* no monitor for given device found */
return STATUS_INVALID_PARAMETER;
}
if (Monitor->IsPrimary && (Monitor->Next != NULL || Monitor->Prev != NULL))
{
PMONITOR NewPrimaryMonitor = (Monitor->Prev != NULL) ? (Monitor->Prev) : (Monitor->Next);
ExEnterCriticalRegionAndAcquireFastMutexUnsafe(&NewPrimaryMonitor->Lock);
NewPrimaryMonitor->IsPrimary = TRUE;
ExReleaseFastMutexUnsafeAndLeaveCriticalRegion(&NewPrimaryMonitor->Lock);
}
if (gMonitorList == Monitor)
{
gMonitorList = Monitor->Next;
if (Monitor->Next != NULL)
Monitor->Next->Prev = NULL;
}
else
{
Monitor->Prev->Next = Monitor->Next;
if (Monitor->Next != NULL)
Monitor->Next->Prev = Monitor->Prev;
}
if (Monitor->hrgnMonitor)
REGION_FreeRgnByHandle(Monitor->hrgnMonitor);
IntDestroyMonitorObject(Monitor);
return STATUS_SUCCESS;
}
/* IntGetPrimaryMonitor
*
* Returns a PMONITOR for the primary monitor
*
* Return value
* PMONITOR
*/
PMONITOR
FASTCALL
IntGetPrimaryMonitor()
{
PMONITOR Monitor;
for (Monitor = gMonitorList; Monitor != NULL; Monitor = Monitor->Next)
{
/* FIXME: I guess locking the monitor is not neccessary to read 1 int */
if (Monitor->IsPrimary)
break;
}
return Monitor;
}
/* IntGetMonitorsFromRect
*
* Returns a list of monitor handles/rectangles. The rectangles in the list are
* the areas of intersection with the monitors.
*
* Arguments
*
* pRect
* Rectangle in desktop coordinates. If this is NULL all monitors are
* returned and the rect list is filled with the sizes of the monitors.
*
* hMonitorList
* Pointer to an array of HMONITOR which is filled with monitor handles.
* Can be NULL
*
* monitorRectList
* Pointer to an array of RECT which is filled with intersection rects in
* desktop coordinates.
* Can be NULL, will be ignored if no intersecting monitor is found and
* flags is MONITOR_DEFAULTTONEAREST
*
* listSize
* Size of the hMonitorList and monitorRectList arguments. If this is zero
* hMonitorList and monitorRectList are ignored.
*
* flags
* Either 0 or MONITOR_DEFAULTTONEAREST (ignored if rect is NULL)
*
* Returns
* The number of monitors which intersect the specified region.
*/
static
UINT
IntGetMonitorsFromRect(OPTIONAL IN LPCRECTL pRect,
OPTIONAL OUT HMONITOR *hMonitorList,
OPTIONAL OUT PRECTL monitorRectList,
OPTIONAL IN DWORD listSize,
OPTIONAL IN DWORD flags)
{
PMONITOR Monitor, NearestMonitor = NULL, PrimaryMonitor = NULL;
UINT iCount = 0;
LONG iNearestDistanceX = 0x7fffffff, iNearestDistanceY = 0x7fffffff;
/* find monitors which intersect the rectangle */
for (Monitor = gMonitorList; Monitor != NULL; Monitor = Monitor->Next)
{
RECTL MonitorRect, IntersectionRect;
ExEnterCriticalRegionAndAcquireFastMutexUnsafe(&Monitor->Lock);
MonitorRect = Monitor->rcMonitor;
ExReleaseFastMutexUnsafeAndLeaveCriticalRegion(&Monitor->Lock);
DPRINT("MonitorRect: left = %d, top = %d, right = %d, bottom = %d\n",
MonitorRect.left, MonitorRect.top, MonitorRect.right, MonitorRect.bottom);
if (flags == MONITOR_DEFAULTTOPRIMARY && Monitor->IsPrimary)
{
PrimaryMonitor = Monitor;
}
if (pRect != NULL)
{
BOOL intersects = TRUE;
/* check if the rect intersects the monitor */
if ((pRect->right < MonitorRect.left) || (pRect->left > MonitorRect.right) ||
(pRect->bottom < MonitorRect.top) || (pRect->top > MonitorRect.bottom))
{
intersects = FALSE;
}
if (flags == MONITOR_DEFAULTTONEAREST && !intersects)
{
INT distanceX, distanceY;
distanceX = MIN(ABS(MonitorRect.left - pRect->right),
ABS(pRect->left - MonitorRect.right));
distanceY = MIN(ABS(MonitorRect.top - pRect->bottom),
ABS(pRect->top - MonitorRect.bottom));
if (((distanceX < iNearestDistanceX) && (distanceY <= iNearestDistanceY)) ||
((distanceX <= iNearestDistanceX) && (distanceY < iNearestDistanceY)))
{
iNearestDistanceX = distanceX;
iNearestDistanceY = distanceY;
NearestMonitor = Monitor;
}
}
if (!intersects)
continue;
/* calculate intersection */
IntersectionRect.left = MAX(MonitorRect.left, pRect->left);
IntersectionRect.top = MAX(MonitorRect.top, pRect->top);
IntersectionRect.right = MIN(MonitorRect.right, pRect->right);
IntersectionRect.bottom = MIN(MonitorRect.bottom, pRect->bottom);
}
else
{
IntersectionRect = MonitorRect;
}
if (iCount < listSize)
{
if (hMonitorList != NULL)
hMonitorList[iCount] = UserHMGetHandle(Monitor);
if (monitorRectList != NULL)
monitorRectList[iCount] = IntersectionRect;
}
iCount++;
}
if (iCount == 0 && flags == MONITOR_DEFAULTTONEAREST)
{
if (iCount < listSize)
{
if (hMonitorList != NULL)
hMonitorList[iCount] = UserHMGetHandle(NearestMonitor);
}
iCount++;
}
else if (iCount == 0 && flags == MONITOR_DEFAULTTOPRIMARY)
{
if (iCount < listSize)
{
if (hMonitorList != NULL)
hMonitorList[iCount] = UserHMGetHandle(PrimaryMonitor);
}
iCount++;
}
return iCount;
}
/* PUBLIC FUNCTIONS ***********************************************************/
/* NtUserEnumDisplayMonitors
*
* Enumerates display monitors which intersect the given HDC/cliprect
*
* Arguments
*
* hDC
* Handle to a DC for which to enum intersecting monitors. If this is NULL
* it returns all monitors which are part of the current virtual screen.
*
* pRect
* Clipping rectangle with coordinate system origin at the DCs origin if the
* given HDC is not NULL or in virtual screen coordinated if it is NULL.
* Can be NULL
*
* hMonitorList
* Pointer to an array of HMONITOR which is filled with monitor handles.
* Can be NULL
*
* monitorRectList
* Pointer to an array of RECT which is filled with intersection rectangles.
* Can be NULL
*
* listSize
* Size of the hMonitorList and monitorRectList arguments. If this is zero
* hMonitorList and monitorRectList are ignored.
*
* Returns
* The number of monitors which intersect the specified region or -1 on failure.
*/
INT
APIENTRY
NtUserEnumDisplayMonitors(
OPTIONAL IN HDC hDC,
OPTIONAL IN LPCRECTL pRect,
OPTIONAL OUT HMONITOR *hMonitorList,
OPTIONAL OUT PRECTL monitorRectList,
OPTIONAL IN DWORD listSize)
{
INT numMonitors, i;
HMONITOR *safeHMonitorList = NULL;
PRECTL safeRectList = NULL;
RECTL rect, *myRect;
RECTL dcRect;
NTSTATUS status;
/* get rect */
if (pRect != NULL)
{
status = MmCopyFromCaller(&rect, pRect, sizeof (RECT));
if (!NT_SUCCESS(status))
{
DPRINT("MmCopyFromCaller() failed!\n");
SetLastNtError(status);
return -1;
}
}
if (hDC != NULL)
{
PDC dc;
INT regionType;
/* get visible region bounding rect */
dc = DC_LockDc(hDC);
if (dc == NULL)
{
DPRINT("DC_LockDc() failed!\n");
/* FIXME: setlasterror? */
return -1;
}
regionType = REGION_GetRgnBox(dc->prgnVis, &dcRect);
DC_UnlockDc(dc);
if (regionType == 0)
{
DPRINT("NtGdiGetRgnBox() failed!\n");
return -1;
}
if (regionType == NULLREGION)
return 0;
if (regionType == COMPLEXREGION)
{ /* TODO: warning */
}
/* if hDC and pRect are given the area of interest is pRect with
coordinate origin at the DC position */
if (pRect != NULL)
{
rect.left += dcRect.left;
rect.right += dcRect.left;
rect.top += dcRect.top;
rect.bottom += dcRect.top;
}
/* if hDC is given and pRect is not the area of interest is the
bounding rect of hDC */
else
{
rect = dcRect;
}
}
if (hDC == NULL && pRect == NULL)
myRect = NULL;
else
myRect = &rect;
/* find intersecting monitors */
numMonitors = IntGetMonitorsFromRect(myRect, NULL, NULL, 0, 0);
if (numMonitors == 0 || listSize == 0 ||
(hMonitorList == NULL && monitorRectList == NULL))
{
DPRINT("numMonitors = %d\n", numMonitors);
return numMonitors;
}
if (hMonitorList != NULL && listSize != 0)
{
safeHMonitorList = ExAllocatePoolWithTag(PagedPool, sizeof (HMONITOR) * listSize, USERTAG_MONITORRECTS);
if (safeHMonitorList == NULL)
{
/* FIXME: SetLastWin32Error? */
return -1;
}
}
if (monitorRectList != NULL && listSize != 0)
{
safeRectList = ExAllocatePoolWithTag(PagedPool, sizeof (RECT) * listSize, USERTAG_MONITORRECTS);
if (safeRectList == NULL)
{
ExFreePoolWithTag(safeHMonitorList, USERTAG_MONITORRECTS);
/* FIXME: SetLastWin32Error? */
return -1;
}
}
/* get intersecting monitors */
numMonitors = IntGetMonitorsFromRect(myRect, safeHMonitorList, safeRectList,
listSize, 0 );
if (hDC != NULL && pRect != NULL && safeRectList != NULL)
for (i = 0; i < numMonitors; i++)
{
safeRectList[i].left -= dcRect.left;
safeRectList[i].right -= dcRect.left;
safeRectList[i].top -= dcRect.top;
safeRectList[i].bottom -= dcRect.top;
}
/* output result */
if (hMonitorList != NULL && listSize != 0)
{
status = MmCopyToCaller(hMonitorList, safeHMonitorList, sizeof (HMONITOR) * listSize);
ExFreePool(safeHMonitorList);
if (!NT_SUCCESS(status))
{
ExFreePoolWithTag(safeRectList, USERTAG_MONITORRECTS);
SetLastNtError(status);
return -1;
}
}
if (monitorRectList != NULL && listSize != 0)
{
status = MmCopyToCaller(monitorRectList, safeRectList, sizeof (RECT) * listSize);
ExFreePoolWithTag(safeRectList, USERTAG_MONITORRECTS);
if (!NT_SUCCESS(status))
{
SetLastNtError(status);
return -1;
}
}
return numMonitors;
}
/* NtUserGetMonitorInfo
*
* Retrieves information about a given monitor
*
* Arguments
*
* hMonitor
* Handle to a monitor for which to get information
*
* pMonitorInfo
* Pointer to a MONITORINFO struct which is filled with the information.
* The cbSize member must be set to sizeof(MONITORINFO) or
* sizeof(MONITORINFOEX). Even if set to sizeof(MONITORINFOEX) only parts
* from MONITORINFO will be filled.
*
* pDevice
* Pointer to a UNICODE_STRING which will recieve the device's name. The
* length should be CCHDEVICENAME
* Can be NULL
*
* Return value
* TRUE on success; FALSE on failure (calls SetLastNtError())
*
*/
BOOL
APIENTRY
NtUserGetMonitorInfo(
IN HMONITOR hMonitor,
OUT LPMONITORINFO pMonitorInfo)
{
PMONITOR Monitor;
MONITORINFOEXW MonitorInfo;
NTSTATUS Status;
DECLARE_RETURN(BOOL);
DPRINT("Enter NtUserGetMonitorInfo\n");
UserEnterShared();
/* get monitor object */
if (!(Monitor = UserGetMonitorObject(hMonitor)))
{
DPRINT("Couldnt find monitor 0x%lx\n", hMonitor);
RETURN(FALSE);
}
if(pMonitorInfo == NULL)
{
SetLastNtError(STATUS_INVALID_PARAMETER);
RETURN(FALSE);
}
/* get size of pMonitorInfo */
Status = MmCopyFromCaller(&MonitorInfo.cbSize, &pMonitorInfo->cbSize, sizeof (MonitorInfo.cbSize));
if (!NT_SUCCESS(Status))
{
SetLastNtError(Status);
RETURN(FALSE);
}
if ((MonitorInfo.cbSize != sizeof (MONITORINFO)) &&
(MonitorInfo.cbSize != sizeof (MONITORINFOEXW)))
{
SetLastNtError(STATUS_INVALID_PARAMETER);
RETURN(FALSE);
}
/* fill monitor info */
MonitorInfo.rcMonitor = Monitor->rcMonitor;
MonitorInfo.rcWork = Monitor->rcWork;
MonitorInfo.dwFlags = 0;
if (Monitor->IsPrimary)
MonitorInfo.dwFlags |= MONITORINFOF_PRIMARY;
/* fill device name */
if (MonitorInfo.cbSize == sizeof (MONITORINFOEXW))
{
WCHAR nul = L'\0';
INT len = Monitor->DeviceName.Length;
if (len >= CCHDEVICENAME * sizeof (WCHAR))
len = (CCHDEVICENAME - 1) * sizeof (WCHAR);
memcpy(MonitorInfo.szDevice, Monitor->DeviceName.Buffer, len);
memcpy(MonitorInfo.szDevice + (len / sizeof (WCHAR)), &nul, sizeof (WCHAR));
}
/* output data */
Status = MmCopyToCaller(pMonitorInfo, &MonitorInfo, MonitorInfo.cbSize);
if (!NT_SUCCESS(Status))
{
DPRINT("GetMonitorInfo: MmCopyToCaller failed\n");
SetLastNtError(Status);
RETURN(FALSE);
}
DPRINT("GetMonitorInfo: success\n");
RETURN(TRUE);
CLEANUP:
DPRINT("Leave NtUserGetMonitorInfo, ret=%i\n",_ret_);
UserLeave();
END_CLEANUP;
}
/* NtUserMonitorFromPoint
*
* Returns a handle to the monitor containing the given point.
*
* Arguments
*
* point
* Point for which to find monitor
*
* dwFlags
* Specifies the behaviour if the point isn't on any of the monitors.
*
* Return value
* If the point is found a handle to the monitor is returned; if not the
* return value depends on dwFlags
*/
HMONITOR
APIENTRY
NtUserMonitorFromPoint(
IN POINT point,
IN DWORD dwFlags)
{
INT NumMonitors;
RECTL InRect;
HMONITOR hMonitor = NULL;
/* fill inRect */
InRect.left = InRect.right = point.x;
InRect.top = InRect.bottom = point.y;
/* find intersecting monitor */
NumMonitors = IntGetMonitorsFromRect(&InRect, &hMonitor, NULL, 1, 0);
if (NumMonitors < 0)
{
return (HMONITOR)NULL;
}
if (hMonitor == NULL)
{
if (dwFlags == MONITOR_DEFAULTTOPRIMARY)
{
PMONITOR MonitorObj = IntGetPrimaryMonitor();
if (MonitorObj)
hMonitor = UserHMGetHandle(MonitorObj);
}
else if (dwFlags == MONITOR_DEFAULTTONEAREST)
{
NumMonitors = IntGetMonitorsFromRect(&InRect, &hMonitor, NULL,
1, MONITOR_DEFAULTTONEAREST);
/*ASSERT( (numMonitors > 0) && (hMonitor != NULL) );*/
}
/* else flag is DEFAULTTONULL */
}
return hMonitor;
}
/* NtUserMonitorFromRect
*
* Returns a handle to the monitor having the largest intersection with a
* given rectangle
*
* Arguments
*
* pRect
* Pointer to a RECT for which to find monitor
*
* dwFlags
* Specifies the behaviour if no monitor intersects the given rect
*
* Return value
* If a monitor intersects the rect a handle to it is returned; if not the
* return value depends on dwFlags
*/
HMONITOR
APIENTRY
NtUserMonitorFromRect(
IN LPCRECTL pRect,
IN DWORD dwFlags)
{
INT numMonitors, iLargestArea = -1, i;
PRECTL rectList;
HMONITOR *hMonitorList;
HMONITOR hMonitor = NULL;
RECTL rect;
NTSTATUS status;
/* get rect */
status = MmCopyFromCaller(&rect, pRect, sizeof (RECT));
if (!NT_SUCCESS(status))
{
SetLastNtError(status);
return (HMONITOR)NULL;
}
/* find intersecting monitors */
numMonitors = IntGetMonitorsFromRect(&rect, NULL, NULL, 0, 0);
if (numMonitors < 0)
{
return (HMONITOR)NULL;
}
if (numMonitors == 0)
{
if (dwFlags == MONITOR_DEFAULTTOPRIMARY)
{
PMONITOR monitorObj = IntGetPrimaryMonitor();
if (monitorObj)
return UserHMGetHandle(monitorObj);
}
else if (dwFlags == MONITOR_DEFAULTTONEAREST)
{
numMonitors = IntGetMonitorsFromRect(&rect, &hMonitor, NULL,
1, MONITOR_DEFAULTTONEAREST);
if (numMonitors <= 0)
{
/* error? */
return (HMONITOR)NULL;
}
if (numMonitors > 0)
return hMonitor;
}
/* else flag is DEFAULTTONULL */
return (HMONITOR)NULL;
}
hMonitorList = ExAllocatePoolWithTag(PagedPool, sizeof (HMONITOR) * numMonitors, USERTAG_MONITORRECTS);
if (hMonitorList == NULL)
{
/* FIXME: SetLastWin32Error? */
return (HMONITOR)NULL;
}
rectList = ExAllocatePoolWithTag(PagedPool, sizeof (RECT) * numMonitors, USERTAG_MONITORRECTS);
if (rectList == NULL)
{
ExFreePoolWithTag(hMonitorList, USERTAG_MONITORRECTS);
/* FIXME: SetLastWin32Error? */
return (HMONITOR)NULL;
}
/* get intersecting monitors */
numMonitors = IntGetMonitorsFromRect(&rect, hMonitorList, rectList,
numMonitors, 0);
if (numMonitors <= 0)
{
ExFreePoolWithTag(hMonitorList, USERTAG_MONITORRECTS);
ExFreePoolWithTag(rectList, USERTAG_MONITORRECTS);
return (HMONITOR)NULL;
}
/* find largest intersection */
for (i = 0; i < numMonitors; i++)
{
INT area = (rectList[i].right - rectList[i].left) *
(rectList[i].bottom - rectList[i].top);
if (area > iLargestArea)
{
hMonitor = hMonitorList[i];
}
}
ExFreePoolWithTag(hMonitorList, USERTAG_MONITORRECTS);
ExFreePoolWithTag(rectList, USERTAG_MONITORRECTS);
return hMonitor;
}
HMONITOR
APIENTRY
NtUserMonitorFromWindow(
IN HWND hWnd,
IN DWORD dwFlags)
{
PWINDOW_OBJECT Window;
HMONITOR hMonitor = NULL;
RECTL Rect;
DECLARE_RETURN(HMONITOR);
DPRINT("Enter NtUserMonitorFromWindow\n");
UserEnterShared();
if (!(Window = UserGetWindowObject(hWnd)))
{
if (dwFlags == MONITOR_DEFAULTTONULL)
{
RETURN(hMonitor);
}
IntGetMonitorsFromRect(NULL, &hMonitor, NULL, 1, dwFlags);
RETURN(hMonitor);
}
if (!Window->Wnd)
RETURN(hMonitor);
Rect.left = Rect.right = Window->Wnd->rcWindow.left;
Rect.top = Rect.bottom = Window->Wnd->rcWindow.bottom;
IntGetMonitorsFromRect(&Rect, &hMonitor, NULL, 1, dwFlags);
RETURN(hMonitor);
CLEANUP:
DPRINT("Leave NtUserMonitorFromWindow, ret=%i\n",_ret_);
UserLeave();
END_CLEANUP;
}
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