dce.h File Reference

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Go to the source code of this file.

Classes
struct	tagDCE

Macros
#define	DCHC_INVALIDVISRGN   0x0001
#define	DCHC_DELETEDC   0x0002
#define	DCHF_INVALIDATEVISRGN   0x0001
#define	DCHF_VALIDATEVISRGN   0x0002
#define	DCX_DCEEMPTY   0x00000800
#define	DCX_DCEBUSY   0x00001000
#define	DCX_DCEDIRTY   0x00002000
#define	DCX_LAYEREDWIN   0x00004000
#define	DCX_DCPOWNED   0x00008000
#define	DCX_NOCLIPCHILDREN   0x00080000
#define	DCX_NORECOMPUTE   0x00100000
#define	DCX_INDESTROY   0x00400000

Typedefs
typedef enum DCE_TYPE *	PDCE_TYPE
typedef struct tagDCE	DCE
typedef struct tagDCE *	PDCE

Enumerations
enum	DCE_TYPE { DCE_CACHE_DC , DCE_CLASS_DC , DCE_WINDOW_DC }

Functions
	CODE_SEG ("INIT") NTSTATUS NTAPI InitDCEImpl(VOID)
PDCE FASTCALL	DceAllocDCE (PWND Window, DCE_TYPE Type)
HWND FASTCALL	IntWindowFromDC (HDC hDc)
void FASTCALL	DceFreeDCE (PDCE dce, BOOLEAN Force)
void FASTCALL	DceEmptyCache (void)
VOID FASTCALL	DceResetActiveDCEs (PWND Window)
void FASTCALL	DceFreeClassDCE (PDCE)
HWND FASTCALL	UserGethWnd (HDC, PWNDOBJ *)
void FASTCALL	DceFreeWindowDCE (PWND)
void FASTCALL	DceFreeThreadDCE (PTHREADINFO)
VOID FASTCALL	DceUpdateVisRgn (DCE *Dce, PWND Window, ULONG Flags)
DCE *FASTCALL	DceGetDceFromDC (HDC hdc)

Macro Definition Documentation

DCHC_DELETEDC

#define DCHC_DELETEDC   0x0002

Definition at line 5 of file dce.h.

DCHC_INVALIDVISRGN

#define DCHC_INVALIDVISRGN   0x0001

Definition at line 4 of file dce.h.

DCHF_INVALIDATEVISRGN

#define DCHF_INVALIDATEVISRGN   0x0001

Definition at line 7 of file dce.h.

DCHF_VALIDATEVISRGN

#define DCHF_VALIDATEVISRGN   0x0002

Definition at line 8 of file dce.h.

DCX_DCEBUSY

#define DCX_DCEBUSY   0x00001000

Definition at line 36 of file dce.h.

DCX_DCEDIRTY

#define DCX_DCEDIRTY   0x00002000

Definition at line 37 of file dce.h.

DCX_DCEEMPTY

#define DCX_DCEEMPTY   0x00000800

Definition at line 35 of file dce.h.

DCX_DCPOWNED

#define DCX_DCPOWNED   0x00008000

Definition at line 39 of file dce.h.

DCX_INDESTROY

#define DCX_INDESTROY   0x00400000

Definition at line 42 of file dce.h.

DCX_LAYEREDWIN

#define DCX_LAYEREDWIN   0x00004000

Definition at line 38 of file dce.h.

DCX_NOCLIPCHILDREN

#define DCX_NOCLIPCHILDREN   0x00080000

Definition at line 40 of file dce.h.

DCX_NORECOMPUTE

#define DCX_NORECOMPUTE   0x00100000

Definition at line 41 of file dce.h.

Typedef Documentation

DCE

typedef struct tagDCE DCE

PDCE

typedef struct tagDCE * PDCE

PDCE_TYPE

typedef enum DCE_TYPE * PDCE_TYPE

Enumeration Type Documentation

DCE_TYPE

enum DCE_TYPE

Enumerator
DCE_CACHE_DC
DCE_CLASS_DC
DCE_WINDOW_DC

Definition at line 10 of file dce.h.

{
    DCE_CACHE_DC,   /* This is a cached DC (allocated by USER) */
    DCE_CLASS_DC,   /* This is a class DC (style CS_CLASSDC) */
    DCE_WINDOW_DC   /* This is a window DC (style CS_OWNDC) */
} DCE_TYPE, *PDCE_TYPE;

Function Documentation

CODE_SEG()

CODE_SEG

(

"INIT"

)

Definition at line 1810 of file Interface.c.

{
    UNICODE_STRING DeviceName = RTL_CONSTANT_STRING(L"\\FileSystem\\Filters\\"DRIVER_NAME);
    PDEVICE_OBJECT RawDeviceObject;
    PDEVICE_OBJECT DeviceObject;
    PFILE_OBJECT RawFileObject;
    UNICODE_STRING ObjectName;
    UNICODE_STRING SymLink;
 
    NTSTATUS Status;
 
    RtlZeroMemory(&DriverData, sizeof(DRIVER_DATA));
    DriverData.DriverObject = DriverObject;
 
    /* Save the registry key for this driver */
    DriverData.ServiceKey.Length = RegistryPath->Length;
    DriverData.ServiceKey.MaximumLength = RegistryPath->MaximumLength;
    DriverData.ServiceKey.Buffer = (PWCHAR)ExAllocatePoolWithTag(NonPagedPool,
                                                                 RegistryPath->MaximumLength,
                                                                 FM_TAG_REGISTRY_DATA);
    if (!DriverData.ServiceKey.Buffer) return STATUS_INSUFFICIENT_RESOURCES;
    RtlCopyUnicodeString(&DriverData.ServiceKey, RegistryPath);
 
    /* Do some initialization */
    ExInitializeFastMutex(&DriverData.FilterAttachLock);
 
    /* Create the main filter manager device object */
    Status = IoCreateDevice(DriverObject,
                            0,
                            &DeviceName,
                            FILE_DEVICE_DISK_FILE_SYSTEM,
                            FILE_DEVICE_SECURE_OPEN,
                            FALSE,
                            &DeviceObject);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("fltmgr IoCreateDevice failed.  Status = %X\n", Status);
        goto Cleanup;
    }
 
    /* Store a global reference so we can access from callbacks */
    DriverData.DeviceObject = DeviceObject;
 
    /* Generate the symbolic link name */
    RtlInitUnicodeString(&SymLink, L"\\??\\"DRIVER_NAME);
    Status = IoCreateSymbolicLink(&SymLink, &DeviceName);
    if (!NT_SUCCESS(Status)) goto Cleanup;
 
    /* Create the callbacks for the dispatch table, FastIo and FS callbacks */
    Status = SetupDispatchAndCallbacksTables(DriverObject);
    if (!NT_SUCCESS(Status)) goto Cleanup;
 
    /* Initialize the comms objects */
    Status = FltpSetupCommunicationObjects(DriverObject);
    if (!NT_SUCCESS(Status)) goto Cleanup;
 
    /* Register for notifications when a new file system is loaded. This also enumerates any existing file systems */
    Status = IoRegisterFsRegistrationChange(DriverObject, FltpFsNotification);
    FLT_ASSERT(Status != STATUS_DEVICE_ALREADY_ATTACHED); // Windows checks for this, I'm not sure how it can happen. Needs investigation??
    if (!NT_SUCCESS(Status))  goto Cleanup;
 
    InitializeListHead(&FilterList);
    ExInitializeResourceLite(&FilterListLock);
 
    /* IoRegisterFsRegistrationChange isn't notified about the raw  file systems, so we attach to them manually */
    RtlInitUnicodeString(&ObjectName, L"\\Device\\RawDisk");
    Status = IoGetDeviceObjectPointer(&ObjectName,
                                      FILE_READ_ATTRIBUTES,
                                      &RawFileObject,
                                      &RawDeviceObject);
    if (NT_SUCCESS(Status))
    {
        FltpFsNotification(RawDeviceObject, TRUE);
        ObDereferenceObject(RawFileObject);
    }
 
    RtlInitUnicodeString(&ObjectName, L"\\Device\\RawCdRom");
    Status = IoGetDeviceObjectPointer(&ObjectName,
                                      FILE_READ_ATTRIBUTES,
                                      &RawFileObject,
                                      &RawDeviceObject);
    if (NT_SUCCESS(Status))
    {
        FltpFsNotification(RawDeviceObject, TRUE);
        ObDereferenceObject(RawFileObject);
    }
 
    /* We're done, clear the initializing flag */
    ClearFlag(DeviceObject->Flags, DO_DEVICE_INITIALIZING);
    Status = STATUS_SUCCESS;
 
Cleanup:
 
    if (!NT_SUCCESS(Status))
    {
        if (DriverData.FastIoDispatch)
        {
            DriverObject->FastIoDispatch = NULL;
            ExFreePoolWithTag(DriverData.FastIoDispatch, FM_TAG_DISPATCH_TABLE);
        }
 
        IoDeleteSymbolicLink(&SymLink);
 
        if (DeviceObject)
            IoDeleteDevice(DeviceObject);
 
        if (DriverData.ServiceKey.Buffer)
            ExFreePoolWithTag(DriverData.ServiceKey.Buffer, FM_TAG_REGISTRY_DATA);
    }
 
    return Status;
}

DceAllocDCE()

PDCE FASTCALL DceAllocDCE	(	PWND	Window,
		DCE_TYPE	Type
	)

Definition at line 86 of file windc.c.

{
  PDCE pDce;
 
  pDce = ExAllocatePoolWithTag(PagedPool, sizeof(DCE), USERTAG_DCE);
  if(!pDce)
        return NULL;
 
  pDce->hDC = DceCreateDisplayDC();
  if (!pDce->hDC)
  {
      ExFreePoolWithTag(pDce, USERTAG_DCE);
      return NULL;
  }
  DCECount++;
  TRACE("Alloc DCE's! %d\n",DCECount);
  pDce->hwndCurrent = (Window ? UserHMGetHandle(Window) : NULL);
  pDce->pwndOrg  = Window;
  pDce->pwndClip = Window;
  pDce->hrgnClip = NULL;
  pDce->hrgnClipPublic = NULL;
  pDce->hrgnSavedVis = NULL;
  pDce->ppiOwner = NULL;
 
  InsertTailList(&LEDce, &pDce->List);
 
  DCU_SetDcUndeletable(pDce->hDC);
 
  if (Type == DCE_WINDOW_DC || Type == DCE_CLASS_DC) // Window DCE have ownership.
  {
     pDce->ptiOwner = GetW32ThreadInfo();
  }
  else
  {
     TRACE("FREE DCATTR!!!! NOT DCE_WINDOW_DC!!!!! hDC-> %p\n", pDce->hDC);
     GreSetDCOwner(pDce->hDC, GDI_OBJ_HMGR_NONE);
     pDce->ptiOwner = NULL;
  }
 
  if (Type == DCE_CACHE_DC)
  {
     pDce->DCXFlags = DCX_CACHE | DCX_DCEEMPTY;
  }
  else
  {
     pDce->DCXFlags = DCX_DCEBUSY;
     if (Window)
     {
        if (Type == DCE_WINDOW_DC)
        {
          if (Window->style & WS_CLIPCHILDREN) pDce->DCXFlags |= DCX_CLIPCHILDREN;
          if (Window->style & WS_CLIPSIBLINGS) pDce->DCXFlags |= DCX_CLIPSIBLINGS;
        }
     }
  }
  return(pDce);
}

Referenced by IntCreateWindow(), and UserGetDCEx().

DceEmptyCache()

void FASTCALL DceEmptyCache

(

void

)

Definition at line 801 of file windc.c.

{
   PDCE pDCE;
   PLIST_ENTRY ListEntry;
 
   ListEntry = LEDce.Flink;
   while (ListEntry != &LEDce)
   {
      pDCE = CONTAINING_RECORD(ListEntry, DCE, List);
      ListEntry = ListEntry->Flink;
      DceFreeDCE(pDCE, TRUE);
   }
}

DceFreeClassDCE()

void FASTCALL DceFreeClassDCE

(

PDCE

pdceClass

)

Definition at line 762 of file windc.c.

{
   PDCE pDCE;
   PLIST_ENTRY ListEntry;
 
   ListEntry = LEDce.Flink;
   while (ListEntry != &LEDce)
   {
       pDCE = CONTAINING_RECORD(ListEntry, DCE, List);
       ListEntry = ListEntry->Flink;
       if (pDCE == pdceClass)
       {
          DceFreeDCE(pDCE, TRUE); // Might have gone cheap!
       }
   }
}

Referenced by IntDestroyClass().

DceFreeDCE()

void FASTCALL DceFreeDCE	(	PDCE	dce,
		BOOLEAN	Force
	)

Definition at line 633 of file windc.c.

{
  BOOL Hit = FALSE;
 
  ASSERT(pdce != NULL);
  if (NULL == pdce) return;
 
  pdce->DCXFlags |= DCX_INDESTROY;
 
  if (Force &&
      GreGetObjectOwner(pdce->hDC) != GDI_OBJ_HMGR_POWNED)
  {
     TRACE("Change ownership for DCE! -> %p\n" , pdce);
     // NOTE: Windows sets W32PF_OWNDCCLEANUP and moves on.
     if (GreIsHandleValid(pdce->hDC))
     {
         GreSetDCOwner(pdce->hDC, GDI_OBJ_HMGR_POWNED);
     }
     else
     {
         ERR("Attempted to change ownership of an DCEhDC %p currently being destroyed!!!\n",
             pdce->hDC);
         Hit = TRUE;
     }
  }
  else
  {
     if (GreGetObjectOwner(pdce->hDC) == GDI_OBJ_HMGR_PUBLIC)
        GreSetDCOwner(pdce->hDC, GDI_OBJ_HMGR_POWNED);
  }
 
  if (!Hit) IntGdiDeleteDC(pdce->hDC, TRUE);
 
  if (pdce->hrgnClip && !(pdce->DCXFlags & DCX_KEEPCLIPRGN))
  {
      GreDeleteObject(pdce->hrgnClip);
      pdce->hrgnClip = NULL;
  }
 
  RemoveEntryList(&pdce->List);
 
  ExFreePoolWithTag(pdce, USERTAG_DCE);
 
  DCECount--;
  TRACE("Freed DCE's! %d \n", DCECount);
}

Referenced by DceEmptyCache(), DceFreeClassDCE(), DceFreeThreadDCE(), DceFreeWindowDCE(), and DceReleaseDC().

DceFreeThreadDCE()

void FASTCALL DceFreeThreadDCE

(

PTHREADINFO

pti

)

Definition at line 780 of file windc.c.

{
   PDCE pDCE;
   PLIST_ENTRY ListEntry;
 
   ListEntry = LEDce.Flink;
   while (ListEntry != &LEDce)
   {
       pDCE = CONTAINING_RECORD(ListEntry, DCE, List);
       ListEntry = ListEntry->Flink;
       if (pDCE->ptiOwner == pti)
       {
          if (pDCE->DCXFlags & DCX_CACHE)
          {
             DceFreeDCE(pDCE, TRUE);
          }
       }
   }
}

Referenced by ExitThreadCallback().

DceFreeWindowDCE()

void FASTCALL DceFreeWindowDCE

(

PWND

Window

)

Definition at line 686 of file windc.c.

{
  PDCE pDCE;
  PLIST_ENTRY ListEntry;
 
  if (DCECount <= 0)
  {
     ERR("FreeWindowDCE No Entry! %d\n",DCECount);
     return;
  }
 
  ListEntry = LEDce.Flink;
  while (ListEntry != &LEDce)
  {
     pDCE = CONTAINING_RECORD(ListEntry, DCE, List);
     ListEntry = ListEntry->Flink;
     if ( pDCE->hwndCurrent == UserHMGetHandle(Window) &&
          !(pDCE->DCXFlags & DCX_DCEEMPTY) )
     {
        if (!(pDCE->DCXFlags & DCX_CACHE)) /* Owned or Class DCE */
        {
           if (Window->pcls->style & CS_CLASSDC) /* Test Class first */
           {
              if (pDCE->DCXFlags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) /* Class DCE */
                 DceDeleteClipRgn(pDCE);
              // Update and reset Vis Rgn and clear the dirty bit.
              // Should release VisRgn than reset it to default.
              DceUpdateVisRgn(pDCE, Window, pDCE->DCXFlags);
              pDCE->DCXFlags = DCX_DCEEMPTY|DCX_CACHE;
              pDCE->hwndCurrent = 0;
              pDCE->pwndOrg = pDCE->pwndClip = NULL;
 
              TRACE("POWNED DCE going Cheap!! DCX_CACHE!! hDC-> %p \n",
                    pDCE->hDC);
              if (!GreSetDCOwner( pDCE->hDC, GDI_OBJ_HMGR_NONE))
              {
                  ERR("Fail Owner Switch hDC-> %p \n", pDCE->hDC);
                  break;
              }
              /* Do not change owner so thread can clean up! */
           }
           else if (Window->pcls->style & CS_OWNDC) /* Owned DCE */
           {
              DceFreeDCE(pDCE, FALSE);
              continue;
           }
           else
           {
              ERR("Not POWNED or CLASSDC hwndCurrent -> %p \n",
                  pDCE->hwndCurrent);
              // ASSERT(FALSE); /* bug 5320 */
           }
        }
        else
        {
           if (pDCE->DCXFlags & DCX_DCEBUSY) /* Shared cache DCE */
           {
              /* FIXME: AFAICS we are doing the right thing here so
               * this should be a TRACE. But this is best left as an ERR
               * because the 'application error' is likely to come from
               * another part of Wine (i.e. it's our fault after all).
               * We should change this to TRACE when ReactOS is more stable
               * (for 1.0?).
               */
              ERR("[%p] GetDC() without ReleaseDC()!\n", UserHMGetHandle(Window));
              DceReleaseDC(pDCE, FALSE);
           }
           pDCE->DCXFlags |= DCX_DCEEMPTY;
           pDCE->hwndCurrent = 0;
           pDCE->pwndOrg = pDCE->pwndClip = NULL;
        }
     }
  }
}

Referenced by co_UserFreeWindow().

DceGetDceFromDC()

DCE *FASTCALL DceGetDceFromDC

(

HDC

hdc

)

Definition at line 53 of file windc.c.

{
    PLIST_ENTRY ListEntry;
    DCE* dce;
 
    ListEntry = LEDce.Flink;
    while (ListEntry != &LEDce)
    {
        dce = CONTAINING_RECORD(ListEntry, DCE, List);
        ListEntry = ListEntry->Flink;
        if (dce->hDC == hdc)
            return dce;
    }
 
    return NULL;
}

DceResetActiveDCEs()

VOID FASTCALL DceResetActiveDCEs

(

PWND

Window

)

Definition at line 816 of file windc.c.

{
   DCE *pDCE;
   PDC dc;
   PWND CurrentWindow;
   INT DeltaX;
   INT DeltaY;
   PLIST_ENTRY ListEntry;
 
   if (NULL == Window)
   {
      return;
   }
 
   ListEntry = LEDce.Flink;
   while (ListEntry != &LEDce)
   {
      pDCE = CONTAINING_RECORD(ListEntry, DCE, List);
      ListEntry = ListEntry->Flink;
      if (0 == (pDCE->DCXFlags & (DCX_DCEEMPTY|DCX_INDESTROY)))
      {
         if (UserHMGetHandle(Window) == pDCE->hwndCurrent)
         {
            CurrentWindow = Window;
         }
         else
         {
            if (!pDCE->hwndCurrent)
               CurrentWindow = NULL;
            else
               CurrentWindow = UserGetWindowObject(pDCE->hwndCurrent);
            if (NULL == CurrentWindow)
            {
               continue;
            }
         }
 
         if (!GreIsHandleValid(pDCE->hDC) ||
             (dc = DC_LockDc(pDCE->hDC)) == NULL)
         {
            continue;
         }
         if (Window == CurrentWindow || IntIsChildWindow(Window, CurrentWindow))
         {
            if (pDCE->DCXFlags & DCX_WINDOW)
            {
               DeltaX = CurrentWindow->rcWindow.left - dc->ptlDCOrig.x;
               DeltaY = CurrentWindow->rcWindow.top - dc->ptlDCOrig.y;
               dc->ptlDCOrig.x = CurrentWindow->rcWindow.left;
               dc->ptlDCOrig.y = CurrentWindow->rcWindow.top;
            }
            else
            {
               DeltaX = CurrentWindow->rcClient.left - dc->ptlDCOrig.x;
               DeltaY = CurrentWindow->rcClient.top - dc->ptlDCOrig.y;
               dc->ptlDCOrig.x = CurrentWindow->rcClient.left;
               dc->ptlDCOrig.y = CurrentWindow->rcClient.top;
            }
 
            if (NULL != dc->dclevel.prgnClip)
            {
               REGION_bOffsetRgn(dc->dclevel.prgnClip, DeltaX, DeltaY);
               dc->fs |= DC_DIRTY_RAO;
            }
            if (NULL != pDCE->hrgnClip)
            {
               NtGdiOffsetRgn(pDCE->hrgnClip, DeltaX, DeltaY);
            }
         }
         DC_UnlockDc(dc);
 
         DceUpdateVisRgn(pDCE, CurrentWindow, pDCE->DCXFlags);
         IntGdiSetHookFlags(pDCE->hDC, DCHF_VALIDATEVISRGN);
      }
   }
}

Referenced by co_IntSetParent(), co_IntSetWindowLongPtr(), co_WinPosSetWindowPos(), and IntSetStyle().

DceUpdateVisRgn()

VOID FASTCALL DceUpdateVisRgn	(	DCE *	Dce,
		PWND	Window,
		ULONG	Flags
	)

Definition at line 192 of file windc.c.

{
   PREGION RgnVisible = NULL;
   ULONG DcxFlags;
   PWND DesktopWindow;
 
   if (Flags & DCX_PARENTCLIP)
   {
      PWND Parent;
 
      Parent = Window->spwndParent;
      if (!Parent)
      {
         RgnVisible = NULL;
         goto noparent;
      }
 
      if (Parent->style & WS_CLIPSIBLINGS)
      {
         DcxFlags = DCX_CLIPSIBLINGS |
                    (Flags & ~(DCX_CLIPCHILDREN | DCX_WINDOW));
      }
      else
      {
         DcxFlags = Flags & ~(DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | DCX_WINDOW);
      }
      RgnVisible = DceGetVisRgn(Parent, DcxFlags, UserHMGetHandle(Window), Flags);
   }
   else if (Window == NULL)
   {
      DesktopWindow = UserGetWindowObject(IntGetDesktopWindow());
      if (NULL != DesktopWindow)
      {
         RgnVisible = IntSysCreateRectpRgnIndirect(&DesktopWindow->rcWindow);
      }
      else
      {
         RgnVisible = NULL;
      }
   }
   else
   {
      RgnVisible = DceGetVisRgn(Window, Flags, 0, 0);
   }
 
noparent:
   if (Flags & DCX_INTERSECTRGN)
   {
      PREGION RgnClip = NULL;
 
      if (Dce->hrgnClip != NULL)
          RgnClip = REGION_LockRgn(Dce->hrgnClip);
 
      if (RgnClip)
      {
         IntGdiCombineRgn(RgnVisible, RgnVisible, RgnClip, RGN_AND);
         REGION_UnlockRgn(RgnClip);
      }
      else
      {
         if (RgnVisible != NULL)
         {
            REGION_Delete(RgnVisible);
         }
         RgnVisible = IntSysCreateRectpRgn(0, 0, 0, 0);
      }
   }
   else if ((Flags & DCX_EXCLUDERGN) && Dce->hrgnClip != NULL)
   {
       PREGION RgnClip = REGION_LockRgn(Dce->hrgnClip);
       IntGdiCombineRgn(RgnVisible, RgnVisible, RgnClip, RGN_DIFF);
       REGION_UnlockRgn(RgnClip);
   }
 
   Dce->DCXFlags &= ~DCX_DCEDIRTY;
   GdiSelectVisRgn(Dce->hDC, RgnVisible);
   /* Tell GDI driver */
   if (Window)
       IntEngWindowChanged(Window, WOC_RGN_CLIENT);
 
   if (RgnVisible != NULL)
   {
      REGION_Delete(RgnVisible);
   }
}

Referenced by DceFreeWindowDCE(), DceReleaseDC(), DceResetActiveDCEs(), and UserGetDCEx().

IntWindowFromDC()

HWND FASTCALL IntWindowFromDC

(

HDC

hDc

)

Definition at line 894 of file windc.c.

{
  DCE *Dce;
  PLIST_ENTRY ListEntry;
  HWND Ret = NULL;
 
  ListEntry = LEDce.Flink;
  while (ListEntry != &LEDce)
  {
      Dce = CONTAINING_RECORD(ListEntry, DCE, List);
      ListEntry = ListEntry->Flink;
      if (Dce->hDC == hDc)
      {
         if (Dce->DCXFlags & DCX_INDESTROY)
            Ret = NULL;
         else
            Ret = Dce->hwndCurrent;
         break;
      }
  }
  return Ret;
}

Referenced by NtGdiUpdateColors(), NtUserCallOneParam(), UserGethWnd(), and UserRealizePalette().

UserGethWnd()

HWND FASTCALL UserGethWnd	(	HDC	hdc,
		PWNDOBJ *	pwndo
	)

Definition at line 953 of file windc.c.

{
  EWNDOBJ* Clip;
  PWND Wnd;
  HWND hWnd;
 
  hWnd = IntWindowFromDC(hdc);
 
  if (hWnd && (Wnd = UserGetWindowObject(hWnd)))
  {
     Clip = (EWNDOBJ*)UserGetProp(Wnd, AtomWndObj, TRUE);
 
     if ( Clip && Clip->Hwnd == hWnd )
     {
        if (pwndo) *pwndo = (PWNDOBJ)Clip;
     }
  }
  return hWnd;
}

Referenced by NtGdiSetPixelFormat(), and NtGdiSwapBuffers().