reactos/subsys/win32k/ntuser/painting.c

   1 /*
   2  *  ReactOS W32 Subsystem
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  *  $Id$
  20  *
  21  *  COPYRIGHT:        See COPYING in the top level directory
  22  *  PROJECT:          ReactOS kernel
  23  *  PURPOSE:          Window painting function
  24  *  FILE:             subsys/win32k/ntuser/painting.c
  25  *  PROGRAMER:        Filip Navara (xnavara@volny.cz)
  26  *  REVISION HISTORY:
  27  *       06/06/2001   Created (?)
  28  *       18/11/2003   Complete rewrite
  29  */
  30
  31 /* INCLUDES ******************************************************************/
  32
  33 #include <w32k.h>
  34
  35 #define NDEBUG
  36 #include <debug.h>
  37
  38 /* PRIVATE FUNCTIONS **********************************************************/
  39
  40 /**
  41  * @name IntIntersectWithParents
  42  *
  43  * Intersect window rectangle with all parent client rectangles.
  44  *
  45  * @param Child
  46  *        Pointer to child window to start intersecting from.
  47  * @param WindowRect
  48  *        Pointer to rectangle that we want to intersect in screen
  49  *        coordinates on input and intersected rectangle on output (if TRUE
  50  *        is returned).
  51  *
  52  * @return
  53  *    If any parent is minimized or invisible or the resulting rectangle
  54  *    is empty then FALSE is returned. Otherwise TRUE is returned.
  55  */
  56
  57 BOOL FASTCALL
  58 IntIntersectWithParents(PWINDOW_OBJECT Child, PRECT WindowRect)
  59 {
  60    PWINDOW_OBJECT ParentWindow;
  61
  62    ParentWindow = Child->Parent;
  63    while (ParentWindow != NULL)
  64    {
  65       if (!(ParentWindow->Style & WS_VISIBLE) ||
  66           (ParentWindow->Style & WS_MINIMIZE))
  67       {
  68          return FALSE;
  69       }
  70
  71       if (!IntGdiIntersectRect(WindowRect, WindowRect, &ParentWindow->ClientRect))
  72       {
  73          return FALSE;
  74       }
  75
  76       /* FIXME: Layered windows. */
  77
  78       ParentWindow = ParentWindow->Parent;
  79    }
  80
  81    return TRUE;
  82 }
  83
  84 VOID FASTCALL
  85 IntValidateParent(PWINDOW_OBJECT Child, HRGN ValidRegion)
  86 {
  87    PWINDOW_OBJECT ParentWindow = Child->Parent;
  88
  89    while (ParentWindow)
  90    {
  91       if (ParentWindow->Style & WS_CLIPCHILDREN)
  92          break;
  93
  94       if (ParentWindow->UpdateRegion != 0)
  95       {
  96          NtGdiCombineRgn(ParentWindow->UpdateRegion, ParentWindow->UpdateRegion,
  97             ValidRegion, RGN_DIFF);
  98          /* FIXME: If the resulting region is empty, remove fake posted paint message */
  99       }
 100
 101       ParentWindow = ParentWindow->Parent;
 102    }
 103 }
 104
 105 /**
 106  * @name IntCalcWindowRgn
 107  *
 108  * Get a window or client region.
 109  */
 110
 111 HRGN FASTCALL
 112 IntCalcWindowRgn(PWINDOW_OBJECT Window, BOOL Client)
 113 {
 114    HRGN hRgnWindow;
 115    UINT RgnType;
 116
 117    if (Client)
 118       hRgnWindow = UnsafeIntCreateRectRgnIndirect(&Window->ClientRect);
 119    else
 120       hRgnWindow = UnsafeIntCreateRectRgnIndirect(&Window->WindowRect);
 121
 122    if (Window->WindowRegion != NULL && !(Window->Style & WS_MINIMIZE))
 123    {
 124       NtGdiOffsetRgn(hRgnWindow,
 125          -Window->WindowRect.left,
 126          -Window->WindowRect.top);
 127       RgnType = NtGdiCombineRgn(hRgnWindow, hRgnWindow, Window->WindowRegion, RGN_AND);
 128       NtGdiOffsetRgn(hRgnWindow,
 129          Window->WindowRect.left,
 130          Window->WindowRect.top);
 131    }
 132
 133    return hRgnWindow;
 134 }
 135
 136 /**
 137  * @name IntGetNCUpdateRgn
 138  *
 139  * Get non-client update region of a window and optionally validate it.
 140  *
 141  * @param Window
 142  *        Pointer to window to get the NC update region from.
 143  * @param Validate
 144  *        Set to TRUE to force validating the NC update region.
 145  *
 146  * @return
 147  *    Handle to NC update region. The caller is responsible for deleting
 148  *    it.
 149  */
 150
 151 HRGN FASTCALL
 152 IntGetNCUpdateRgn(PWINDOW_OBJECT Window, BOOL Validate)
 153 {
 154    HRGN hRgnNonClient;
 155    HRGN hRgnWindow;
 156    UINT RgnType;
 157
 158    if (Window->UpdateRegion != NULL &&
 159        Window->UpdateRegion != (HRGN)1)
 160    {
 161       hRgnNonClient = NtGdiCreateRectRgn(0, 0, 0, 0);
 162       hRgnWindow = IntCalcWindowRgn(Window, TRUE);
 163
 164       /*
 165        * If region creation fails it's safe to fallback to whole
 166        * window region.
 167        */
 168
 169       if (hRgnNonClient == NULL)
 170       {
 171          return (HRGN)1;
 172       }
 173
 174       RgnType = NtGdiCombineRgn(hRgnNonClient, Window->UpdateRegion,
 175                                 hRgnWindow, RGN_DIFF);
 176       if (RgnType == ERROR)
 177       {
 178          NtGdiDeleteObject(hRgnNonClient);
 179          return (HRGN)1;
 180       }
 181       else if (RgnType == NULLREGION)
 182       {
 183          NtGdiDeleteObject(hRgnNonClient);
 184          return NULL;
 185       }
 186
 187       /*
 188        * Remove the nonclient region from the standard update region if
 189        * we were asked for it.
 190        */
 191
 192       if (Validate)
 193       {
 194          if (NtGdiCombineRgn(Window->UpdateRegion, Window->UpdateRegion,
 195                              hRgnWindow, RGN_AND) == NULLREGION)
 196          {
 197             GDIOBJ_SetOwnership(Window->UpdateRegion, PsGetCurrentProcess());
 198             NtGdiDeleteObject(Window->UpdateRegion);
 199             Window->UpdateRegion = NULL;
 200             if (!(Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT))
 201                MsqDecPaintCountQueue(Window->MessageQueue);
 202          }
 203       }
 204
 205       NtGdiDeleteObject(hRgnWindow);
 206
 207       return hRgnNonClient;
 208    }
 209    else
 210    {
 211       return Window->UpdateRegion;
 212    }
 213 }
 214
 215 /*
 216  * IntPaintWindows
 217  *
 218  * Internal function used by IntRedrawWindow.
 219  */
 220
 221 STATIC VOID FASTCALL
 222 co_IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
 223 {
 224    HDC hDC;
 225    HWND hWnd = Window->hSelf;
 226    HRGN TempRegion;
 227
 228    if (Flags & (RDW_ERASENOW | RDW_UPDATENOW))
 229    {
 230       if (Window->UpdateRegion)
 231       {
 232          IntValidateParent(Window, Window->UpdateRegion);
 233       }
 234
 235       if (Flags & RDW_UPDATENOW)
 236       {
 237          if (Window->UpdateRegion != NULL ||
 238              Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT)
 239          {
 240             co_IntSendMessage(hWnd, WM_PAINT, 0, 0);
 241          }
 242       }
 243       else
 244       {
 245          if (Window->Flags & WINDOWOBJECT_NEED_NCPAINT)
 246          {
 247             TempRegion = IntGetNCUpdateRgn(Window, TRUE);
 248             Window->Flags &= ~WINDOWOBJECT_NEED_NCPAINT;
 249             MsqDecPaintCountQueue(Window->MessageQueue);
 250             co_IntSendMessage(hWnd, WM_NCPAINT, (WPARAM)TempRegion, 0);
 251             if ((HANDLE) 1 != TempRegion && NULL != TempRegion)
 252             {
 253                /* NOTE: The region can already be deleted! */
 254                GDIOBJ_FreeObj(TempRegion, GDI_OBJECT_TYPE_REGION | GDI_OBJECT_TYPE_SILENT);
 255             }
 256          }
 257
 258          if (Window->Flags & WINDOWOBJECT_NEED_ERASEBKGND)
 259          {
 260             if (Window->UpdateRegion)
 261             {
 262                hDC = UserGetDCEx(Window, Window->UpdateRegion,
 263                                  DCX_CACHE | DCX_USESTYLE |
 264                                  DCX_INTERSECTRGN | DCX_KEEPCLIPRGN);
 265                if (co_IntSendMessage(hWnd, WM_ERASEBKGND, (WPARAM)hDC, 0))
 266                {
 267                   Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 268                }
 269                UserReleaseDC(Window, hDC, FALSE);
 270             }
 271          }
 272       }
 273    }
 274
 275    /*
 276     * Check that the window is still valid at this point
 277     */
 278    if (!IntIsWindow(hWnd))
 279    {
 280       return;
 281    }
 282
 283    /*
 284     * Paint child windows.
 285     */
 286    if (!(Flags & RDW_NOCHILDREN) && !(Window->Style & WS_MINIMIZE) &&
 287        ((Flags & RDW_ALLCHILDREN) || !(Window->Style & WS_CLIPCHILDREN)))
 288    {
 289       HWND *List, *phWnd;
 290
 291       if ((List = IntWinListChildren(Window)))
 292       {
 293          for (phWnd = List; *phWnd; ++phWnd)
 294          {
 295             Window = UserGetWindowObject(*phWnd);
 296             if (Window && (Window->Style & WS_VISIBLE))
 297             {
 298                UserRefObjectCo(Window);
 299                co_IntPaintWindows(Window, Flags);
 300                UserDerefObjectCo(Window);
 301             }
 302          }
 303          ExFreePool(List);
 304       }
 305    }
 306 }
 307
 308 /*
 309  * IntInvalidateWindows
 310  *
 311  * Internal function used by IntRedrawWindow.
 312  */
 313
 314 VOID FASTCALL
 315 IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags)
 316 {
 317    INT RgnType;
 318    BOOL HadPaintMessage, HadNCPaintMessage;
 319    BOOL HasPaintMessage, HasNCPaintMessage;
 320
 321    /*
 322     * Clip the given region with window rectangle (or region)
 323     */
 324
 325    if (!Window->WindowRegion || (Window->Style & WS_MINIMIZE))
 326    {
 327       HRGN hRgnWindow;
 328
 329       hRgnWindow = UnsafeIntCreateRectRgnIndirect(&Window->WindowRect);
 330       RgnType = NtGdiCombineRgn(hRgn, hRgn, hRgnWindow, RGN_AND);
 331       NtGdiDeleteObject(hRgnWindow);
 332    }
 333    else
 334    {
 335       NtGdiOffsetRgn(hRgn,
 336          -Window->WindowRect.left,
 337          -Window->WindowRect.top);
 338       RgnType = NtGdiCombineRgn(hRgn, hRgn, Window->WindowRegion, RGN_AND);
 339       NtGdiOffsetRgn(hRgn,
 340          Window->WindowRect.left,
 341          Window->WindowRect.top);
 342    }
 343
 344    /*
 345     * Save current state of pending updates
 346     */
 347
 348    HadPaintMessage = Window->UpdateRegion != NULL ||
 349                      Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT;
 350    HadNCPaintMessage = Window->Flags & WINDOWOBJECT_NEED_NCPAINT;
 351
 352    /*
 353     * Update the region and flags
 354     */
 355
 356    if (Flags & RDW_INVALIDATE && RgnType != NULLREGION)
 357    {
 358       if (Window->UpdateRegion == NULL)
 359       {
 360          Window->UpdateRegion = NtGdiCreateRectRgn(0, 0, 0, 0);
 361          GDIOBJ_SetOwnership(Window->UpdateRegion, NULL);
 362       }
 363
 364       if (NtGdiCombineRgn(Window->UpdateRegion, Window->UpdateRegion,
 365                           hRgn, RGN_OR) == NULLREGION)
 366       {
 367          GDIOBJ_SetOwnership(Window->UpdateRegion, PsGetCurrentProcess());
 368          NtGdiDeleteObject(Window->UpdateRegion);
 369          Window->UpdateRegion = NULL;
 370       }
 371
 372       if (Flags & RDW_FRAME)
 373          Window->Flags |= WINDOWOBJECT_NEED_NCPAINT;
 374       if (Flags & RDW_ERASE)
 375          Window->Flags |= WINDOWOBJECT_NEED_ERASEBKGND;
 376
 377       Flags |= RDW_FRAME;
 378    }
 379
 380    if (Flags & RDW_VALIDATE && RgnType != NULLREGION)
 381    {
 382       if (Window->UpdateRegion != NULL)
 383       {
 384          if (NtGdiCombineRgn(Window->UpdateRegion, Window->UpdateRegion,
 385                              hRgn, RGN_DIFF) == NULLREGION)
 386          {
 387             GDIOBJ_SetOwnership(Window->UpdateRegion, PsGetCurrentProcess());
 388             NtGdiDeleteObject(Window->UpdateRegion);
 389             Window->UpdateRegion = NULL;
 390          }
 391       }
 392
 393       if (Window->UpdateRegion == NULL)
 394          Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 395       if (Flags & RDW_NOFRAME)
 396          Window->Flags &= ~WINDOWOBJECT_NEED_NCPAINT;
 397       if (Flags & RDW_NOERASE)
 398          Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 399    }
 400
 401    if (Flags & RDW_INTERNALPAINT)
 402    {
 403       Window->Flags |= WINDOWOBJECT_NEED_INTERNALPAINT;
 404    }
 405
 406    if (Flags & RDW_NOINTERNALPAINT)
 407    {
 408       Window->Flags &= ~WINDOWOBJECT_NEED_INTERNALPAINT;
 409    }
 410
 411    /*
 412     * Process children if needed
 413     */
 414
 415    if (!(Flags & RDW_NOCHILDREN) && !(Window->Style & WS_MINIMIZE) &&
 416          ((Flags & RDW_ALLCHILDREN) || !(Window->Style & WS_CLIPCHILDREN)))
 417    {
 418       PWINDOW_OBJECT Child;
 419
 420       for (Child = Window->FirstChild; Child; Child = Child->NextSibling)
 421       {
 422          if (Child->Style & WS_VISIBLE)
 423          {
 424             /*
 425              * Recursive call to update children UpdateRegion
 426              */
 427             HRGN hRgnTemp = NtGdiCreateRectRgn(0, 0, 0, 0);
 428             NtGdiCombineRgn(hRgnTemp, hRgn, 0, RGN_COPY);
 429             IntInvalidateWindows(Child, hRgnTemp, Flags);
 430             NtGdiDeleteObject(hRgnTemp);
 431          }
 432
 433       }
 434    }
 435
 436    /*
 437     * Fake post paint messages to window message queue if needed
 438     */
 439
 440    HasPaintMessage = Window->UpdateRegion != NULL ||
 441                      Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT;
 442    HasNCPaintMessage = Window->Flags & WINDOWOBJECT_NEED_NCPAINT;
 443
 444    if (HasPaintMessage != HadPaintMessage)
 445    {
 446       if (HadPaintMessage)
 447          MsqDecPaintCountQueue(Window->MessageQueue);
 448       else
 449          MsqIncPaintCountQueue(Window->MessageQueue);
 450    }
 451
 452    if (HasNCPaintMessage != HadNCPaintMessage)
 453    {
 454       if (HadNCPaintMessage)
 455          MsqDecPaintCountQueue(Window->MessageQueue);
 456       else
 457          MsqIncPaintCountQueue(Window->MessageQueue);
 458    }
 459
 460 }
 461
 462 /*
 463  * IntIsWindowDrawable
 464  *
 465  * Remarks
 466  *    Window is drawable when it is visible and all parents are not
 467  *    minimized.
 468  */
 469
 470 BOOL FASTCALL
 471 IntIsWindowDrawable(PWINDOW_OBJECT Window)
 472 {
 473    PWINDOW_OBJECT Wnd;
 474
 475    for (Wnd = Window; Wnd != NULL; Wnd = Wnd->Parent)
 476    {
 477       if (!(Wnd->Style & WS_VISIBLE) ||
 478             ((Wnd->Style & WS_MINIMIZE) && (Wnd != Window)))
 479       {
 480          return FALSE;
 481       }
 482    }
 483
 484    return TRUE;
 485 }
 486
 487 /*
 488  * IntRedrawWindow
 489  *
 490  * Internal version of NtUserRedrawWindow that takes WINDOW_OBJECT as
 491  * first parameter.
 492  */
 493
 494 BOOL FASTCALL
 495 co_UserRedrawWindow(PWINDOW_OBJECT Window, const RECT* UpdateRect, HRGN UpdateRgn,
 496                     ULONG Flags)
 497 {
 498    HRGN hRgn = NULL;
 499
 500    /*
 501     * Step 1.
 502     * Validation of passed parameters.
 503     */
 504
 505    if (!IntIsWindowDrawable(Window) ||
 506          (Flags & (RDW_VALIDATE | RDW_INVALIDATE)) ==
 507          (RDW_VALIDATE | RDW_INVALIDATE))
 508    {
 509       return FALSE;
 510    }
 511
 512    /*
 513     * Step 2.
 514     * Transform the parameters UpdateRgn and UpdateRect into
 515     * a region hRgn specified in screen coordinates.
 516     */
 517
 518    if (Flags & (RDW_INVALIDATE | RDW_VALIDATE))
 519    {
 520       if (UpdateRgn != NULL)
 521       {
 522          hRgn = NtGdiCreateRectRgn(0, 0, 0, 0);
 523          if (NtGdiCombineRgn(hRgn, UpdateRgn, NULL, RGN_COPY) == NULLREGION)
 524             NtGdiDeleteObject(hRgn);
 525          else
 526             NtGdiOffsetRgn(hRgn, Window->ClientRect.left, Window->ClientRect.top);
 527       }
 528       else if (UpdateRect != NULL)
 529       {
 530          if (!IntGdiIsEmptyRect(UpdateRect))
 531          {
 532             hRgn = UnsafeIntCreateRectRgnIndirect((RECT *)UpdateRect);
 533             NtGdiOffsetRgn(hRgn, Window->ClientRect.left, Window->ClientRect.top);
 534          }
 535       }
 536       else if ((Flags & (RDW_INVALIDATE | RDW_FRAME)) == (RDW_INVALIDATE | RDW_FRAME) ||
 537                (Flags & (RDW_VALIDATE | RDW_NOFRAME)) == (RDW_VALIDATE | RDW_NOFRAME))
 538       {
 539          if (!IntGdiIsEmptyRect(&Window->WindowRect))
 540             hRgn = UnsafeIntCreateRectRgnIndirect(&Window->WindowRect);
 541       }
 542       else
 543       {
 544          if (!IntGdiIsEmptyRect(&Window->ClientRect))
 545             hRgn = UnsafeIntCreateRectRgnIndirect(&Window->ClientRect);
 546       }
 547    }
 548
 549    /*
 550     * Step 3.
 551     * Adjust the window update region depending on hRgn and flags.
 552     */
 553
 554    if (Flags & (RDW_INVALIDATE | RDW_VALIDATE | RDW_INTERNALPAINT | RDW_NOINTERNALPAINT) &&
 555        hRgn != NULL)
 556    {
 557       IntInvalidateWindows(Window, hRgn, Flags);
 558    }
 559
 560    /*
 561     * Step 4.
 562     * Repaint and erase windows if needed.
 563     */
 564
 565    if (Flags & (RDW_ERASENOW | RDW_UPDATENOW))
 566    {
 567       co_IntPaintWindows(Window, Flags);
 568    }
 569
 570    /*
 571     * Step 5.
 572     * Cleanup ;-)
 573     */
 574
 575    if (hRgn != NULL)
 576    {
 577       NtGdiDeleteObject(hRgn);
 578    }
 579
 580    return TRUE;
 581 }
 582
 583 BOOL FASTCALL
 584 IntIsWindowDirty(PWINDOW_OBJECT Window)
 585 {
 586    return (Window->Style & WS_VISIBLE) &&
 587           ((Window->UpdateRegion != NULL) ||
 588            (Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT) ||
 589            (Window->Flags & WINDOWOBJECT_NEED_NCPAINT));
 590 }
 591
 592 HWND FASTCALL
 593 IntFindWindowToRepaint(PWINDOW_OBJECT Window, PW32THREAD Thread)
 594 {
 595    HWND hChild;
 596    PWINDOW_OBJECT TempWindow;
 597
 598    for (; Window != NULL; Window = Window->NextSibling)
 599    {
 600       if (IntWndBelongsToThread(Window, Thread) &&
 601           IntIsWindowDirty(Window))
 602       {
 603          /* Make sure all non-transparent siblings are already drawn. */
 604          if (Window->ExStyle & WS_EX_TRANSPARENT)
 605          {
 606             for (TempWindow = Window->NextSibling; TempWindow != NULL;
 607                  TempWindow = TempWindow->NextSibling)
 608             {
 609                if (!(TempWindow->ExStyle & WS_EX_TRANSPARENT) &&
 610                    IntWndBelongsToThread(TempWindow, Thread) &&
 611                    IntIsWindowDirty(TempWindow))
 612                {
 613                   return TempWindow->hSelf;
 614                }
 615             }
 616          }
 617
 618          return Window->hSelf;
 619       }
 620
 621       if (Window->FirstChild)
 622       {
 623          hChild = IntFindWindowToRepaint(Window->FirstChild, Thread);
 624          if (hChild != NULL)
 625             return hChild;
 626       }
 627    }
 628
 629    return NULL;
 630 }
 631
 632 BOOL FASTCALL
 633 IntGetPaintMessage(HWND hWnd, UINT MsgFilterMin, UINT MsgFilterMax,
 634                    PW32THREAD Thread, MSG *Message, BOOL Remove)
 635 {
 636    PUSER_MESSAGE_QUEUE MessageQueue = (PUSER_MESSAGE_QUEUE)Thread->MessageQueue;
 637
 638    if (!MessageQueue->PaintCount)
 639       return FALSE;
 640
 641    if ((MsgFilterMin != 0 || MsgFilterMax != 0) &&
 642          (MsgFilterMin > WM_PAINT || MsgFilterMax < WM_PAINT))
 643       return FALSE;
 644
 645    Message->hwnd = IntFindWindowToRepaint(UserGetDesktopWindow(), PsGetWin32Thread());
 646
 647    if (Message->hwnd == NULL)
 648    {
 649       DPRINT1("PAINTING BUG: Thread marked as containing dirty windows, but no dirty windows found!\n");
 650       return FALSE;
 651    }
 652
 653    if (hWnd != NULL && Message->hwnd != hWnd)
 654       return FALSE;
 655
 656    Message->message = WM_PAINT;
 657    Message->wParam = Message->lParam = 0;
 658
 659    return TRUE;
 660 }
 661
 662 static
 663 HWND FASTCALL
 664 co_IntFixCaret(PWINDOW_OBJECT Window, LPRECT lprc, UINT flags)
 665 {
 666    PDESKTOP_OBJECT Desktop;
 667    PTHRDCARETINFO CaretInfo;
 668    HWND hWndCaret;
 669    PWINDOW_OBJECT WndCaret;
 670
 671    ASSERT_REFS_CO(Window);
 672
 673    Desktop = PsGetCurrentThread()->Tcb.Win32Thread->Desktop;
 674    CaretInfo = ((PUSER_MESSAGE_QUEUE)Desktop->ActiveMessageQueue)->CaretInfo;
 675    hWndCaret = CaretInfo->hWnd;
 676
 677    WndCaret = UserGetWindowObject(hWndCaret);
 678
 679    //fix: check for WndCaret can be null
 680    if (WndCaret == Window ||
 681          ((flags & SW_SCROLLCHILDREN) && IntIsChildWindow(Window, WndCaret)))
 682    {
 683       POINT pt, FromOffset, ToOffset, Offset;
 684       RECT rcCaret;
 685
 686       pt.x = CaretInfo->Pos.x;
 687       pt.y = CaretInfo->Pos.y;
 688       IntGetClientOrigin(WndCaret, &FromOffset);
 689       IntGetClientOrigin(Window, &ToOffset);
 690       Offset.x = FromOffset.x - ToOffset.x;
 691       Offset.y = FromOffset.y - ToOffset.y;
 692       rcCaret.left = pt.x;
 693       rcCaret.top = pt.y;
 694       rcCaret.right = pt.x + CaretInfo->Size.cx;
 695       rcCaret.bottom = pt.y + CaretInfo->Size.cy;
 696       if (IntGdiIntersectRect(lprc, lprc, &rcCaret))
 697       {
 698          co_UserHideCaret(0);
 699          lprc->left = pt.x;
 700          lprc->top = pt.y;
 701          return hWndCaret;
 702       }
 703    }
 704
 705    return 0;
 706 }
 707
 708 /* PUBLIC FUNCTIONS ***********************************************************/
 709
 710 /*
 711  * NtUserBeginPaint
 712  *
 713  * Status
 714  *    @implemented
 715  */
 716
 717 HDC STDCALL
 718 NtUserBeginPaint(HWND hWnd, PAINTSTRUCT* UnsafePs)
 719 {
 720    PWINDOW_OBJECT Window = NULL;
 721    PAINTSTRUCT Ps;
 722    PROSRGNDATA Rgn;
 723    NTSTATUS Status;
 724    DECLARE_RETURN(HDC);
 725
 726    DPRINT("Enter NtUserBeginPaint\n");
 727    UserEnterExclusive();
 728
 729    if (!(Window = UserGetWindowObject(hWnd)))
 730    {
 731       RETURN( NULL);
 732    }
 733
 734    UserRefObjectCo(Window);
 735
 736    co_UserHideCaret(Window);
 737
 738    if (Window->Flags & WINDOWOBJECT_NEED_NCPAINT)
 739    {
 740       HRGN hRgn;
 741
 742       hRgn = IntGetNCUpdateRgn(Window, FALSE);
 743       Window->Flags &= ~WINDOWOBJECT_NEED_NCPAINT;
 744       MsqDecPaintCountQueue(Window->MessageQueue);
 745       co_IntSendMessage(hWnd, WM_NCPAINT, (WPARAM)hRgn, 0);
 746       if (hRgn != (HANDLE)1 && hRgn != NULL)
 747       {
 748          /* NOTE: The region can already by deleted! */
 749          GDIOBJ_FreeObj(hRgn, GDI_OBJECT_TYPE_REGION | GDI_OBJECT_TYPE_SILENT);
 750       }
 751    }
 752
 753    RtlZeroMemory(&Ps, sizeof(PAINTSTRUCT));
 754
 755    Ps.hdc = UserGetDCEx(Window, Window->UpdateRegion, DCX_INTERSECTRGN | DCX_USESTYLE);
 756    if (!Ps.hdc)
 757    {
 758       RETURN( NULL);
 759    }
 760
 761    if (Window->UpdateRegion != NULL)
 762    {
 763       MsqDecPaintCountQueue(Window->MessageQueue);
 764       Rgn = RGNDATA_LockRgn(Window->UpdateRegion);
 765       if (NULL != Rgn)
 766       {
 767          UnsafeIntGetRgnBox(Rgn, &Ps.rcPaint);
 768          RGNDATA_UnlockRgn(Rgn);
 769          IntGdiOffsetRect(&Ps.rcPaint,
 770                           -Window->ClientRect.left,
 771                           -Window->ClientRect.top);
 772       }
 773       else
 774       {
 775          IntGetClientRect(Window, &Ps.rcPaint);
 776       }
 777       GDIOBJ_SetOwnership(Window->UpdateRegion, PsGetCurrentProcess());
 778       Window->UpdateRegion = NULL;
 779    }
 780    else
 781    {
 782       if (Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT)
 783          MsqDecPaintCountQueue(Window->MessageQueue);
 784
 785       IntGetClientRect(Window, &Ps.rcPaint);
 786    }
 787
 788    Window->Flags &= ~WINDOWOBJECT_NEED_INTERNALPAINT;
 789
 790    if (Window->Flags & WINDOWOBJECT_NEED_ERASEBKGND)
 791    {
 792       Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 793       Ps.fErase = !co_IntSendMessage(hWnd, WM_ERASEBKGND, (WPARAM)Ps.hdc, 0);
 794    }
 795    else
 796    {
 797       Ps.fErase = FALSE;
 798    }
 799
 800    Status = MmCopyToCaller(UnsafePs, &Ps, sizeof(PAINTSTRUCT));
 801    if (! NT_SUCCESS(Status))
 802    {
 803       SetLastNtError(Status);
 804       RETURN( NULL);
 805    }
 806
 807    RETURN( Ps.hdc);
 808
 809 CLEANUP:
 810    if (Window) UserDerefObjectCo(Window);
 811
 812    DPRINT("Leave NtUserBeginPaint, ret=%i\n",_ret_);
 813    UserLeave();
 814    END_CLEANUP;
 815
 816 }
 817
 818 /*
 819  * NtUserEndPaint
 820  *
 821  * Status
 822  *    @implemented
 823  */
 824
 825 BOOL STDCALL
 826 NtUserEndPaint(HWND hWnd, CONST PAINTSTRUCT* lPs)
 827 {
 828    PWINDOW_OBJECT Window;
 829    DECLARE_RETURN(BOOL);
 830
 831    DPRINT("Enter NtUserEndPaint\n");
 832    UserEnterExclusive();
 833
 834    if (!(Window = UserGetWindowObject(hWnd)))
 835    {
 836       RETURN(FALSE);
 837    }
 838
 839    UserReleaseDC(Window, lPs->hdc, TRUE);
 840
 841    UserRefObjectCo(Window);
 842    co_UserShowCaret(Window);
 843    UserDerefObjectCo(Window);
 844
 845    RETURN(TRUE);
 846
 847 CLEANUP:
 848    DPRINT("Leave NtUserEndPaint, ret=%i\n",_ret_);
 849    UserLeave();
 850    END_CLEANUP;
 851 }
 852
 853
 854 INT FASTCALL
 855 co_UserGetUpdateRgn(PWINDOW_OBJECT Window, HRGN hRgn, BOOL bErase)
 856 {
 857    int RegionType;
 858
 859    ASSERT_REFS_CO(Window);
 860
 861    if (Window->UpdateRegion == NULL)
 862    {
 863       RegionType = (NtGdiSetRectRgn(hRgn, 0, 0, 0, 0) ? NULLREGION : ERROR);
 864    }
 865    else
 866    {
 867       RegionType = NtGdiCombineRgn(hRgn, Window->UpdateRegion, hRgn, RGN_COPY);
 868       NtGdiOffsetRgn(hRgn, -Window->ClientRect.left, -Window->ClientRect.top);
 869    }
 870
 871    if (bErase && RegionType != NULLREGION && RegionType != ERROR)
 872    {
 873       co_UserRedrawWindow(Window, NULL, NULL, RDW_ERASENOW | RDW_NOCHILDREN);
 874    }
 875
 876    return RegionType;
 877 }
 878 /*
 879  * NtUserGetUpdateRgn
 880  *
 881  * Status
 882  *    @implemented
 883  */
 884
 885 INT STDCALL
 886 NtUserGetUpdateRgn(HWND hWnd, HRGN hRgn, BOOL bErase)
 887 {
 888    DECLARE_RETURN(INT);
 889    PWINDOW_OBJECT Window;
 890    INT ret;
 891
 892    DPRINT("Enter NtUserGetUpdateRgn\n");
 893    UserEnterExclusive();
 894
 895    if (!(Window = UserGetWindowObject(hWnd)))
 896    {
 897       RETURN(ERROR);
 898    }
 899
 900    UserRefObjectCo(Window);
 901    ret = co_UserGetUpdateRgn(Window, hRgn, bErase);
 902    UserDerefObjectCo(Window);
 903
 904    RETURN(ret);
 905
 906 CLEANUP:
 907    DPRINT("Leave NtUserGetUpdateRgn, ret=%i\n",_ret_);
 908    UserLeave();
 909    END_CLEANUP;
 910 }
 911
 912 /*
 913  * NtUserGetUpdateRect
 914  *
 915  * Status
 916  *    @implemented
 917  */
 918
 919 BOOL STDCALL
 920 NtUserGetUpdateRect(HWND hWnd, LPRECT UnsafeRect, BOOL bErase)
 921 {
 922    PWINDOW_OBJECT Window;
 923    RECT Rect;
 924    INT RegionType;
 925    PROSRGNDATA RgnData;
 926    BOOL AlwaysPaint;
 927    NTSTATUS Status;
 928    DECLARE_RETURN(BOOL);
 929
 930    DPRINT("Enter NtUserGetUpdateRect\n");
 931    UserEnterExclusive();
 932
 933    if (!(Window = UserGetWindowObject(hWnd)))
 934    {
 935       RETURN( ERROR);
 936    }
 937
 938    if (Window->UpdateRegion == NULL)
 939    {
 940       Rect.left = Rect.top = Rect.right = Rect.bottom = 0;
 941    }
 942    else
 943    {
 944       RgnData = RGNDATA_LockRgn(Window->UpdateRegion);
 945       ASSERT(RgnData != NULL);
 946       RegionType = UnsafeIntGetRgnBox(RgnData, &Rect);
 947       ASSERT(RegionType != ERROR);
 948       RGNDATA_UnlockRgn(RgnData);
 949    }
 950    AlwaysPaint = (Window->Flags & WINDOWOBJECT_NEED_NCPAINT) ||
 951                  (Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT);
 952
 953    if (bErase && Rect.left < Rect.right && Rect.top < Rect.bottom)
 954    {
 955       UserRefObjectCo(Window);
 956       co_UserRedrawWindow(Window, NULL, NULL, RDW_ERASENOW | RDW_NOCHILDREN);
 957       UserDerefObjectCo(Window);
 958    }
 959
 960    if (UnsafeRect != NULL)
 961    {
 962       Status = MmCopyToCaller(UnsafeRect, &Rect, sizeof(RECT));
 963       if (!NT_SUCCESS(Status))
 964       {
 965          SetLastWin32Error(ERROR_INVALID_PARAMETER);
 966          RETURN( FALSE);
 967       }
 968    }
 969
 970    RETURN( (Rect.left < Rect.right && Rect.top < Rect.bottom) || AlwaysPaint);
 971
 972 CLEANUP:
 973    DPRINT("Leave NtUserGetUpdateRect, ret=%i\n",_ret_);
 974    UserLeave();
 975    END_CLEANUP;
 976 }
 977
 978 /*
 979  * NtUserRedrawWindow
 980  *
 981  * Status
 982  *    @implemented
 983  */
 984
 985 BOOL STDCALL
 986 NtUserRedrawWindow(HWND hWnd, CONST RECT *lprcUpdate, HRGN hrgnUpdate,
 987                    UINT flags)
 988 {
 989    RECT SafeUpdateRect;
 990    NTSTATUS Status;
 991    PWINDOW_OBJECT Wnd;
 992    DECLARE_RETURN(BOOL);
 993
 994    DPRINT("Enter NtUserRedrawWindow\n");
 995    UserEnterExclusive();
 996
 997    if (!(Wnd = UserGetWindowObject(hWnd ? hWnd : IntGetDesktopWindow())))
 998    {
 999       RETURN( FALSE);
1000    }
1001
1002    if (lprcUpdate != NULL)
1003    {
1004       Status = MmCopyFromCaller(&SafeUpdateRect, (PRECT)lprcUpdate,
1005                                 sizeof(RECT));
1006
1007       if (!NT_SUCCESS(Status))
1008       {
1009          SetLastWin32Error(ERROR_INVALID_PARAMETER);
1010          RETURN( FALSE);
1011       }
1012    }
1013
1014    UserRefObjectCo(Wnd);
1015
1016    Status = co_UserRedrawWindow(Wnd, NULL == lprcUpdate ? NULL : &SafeUpdateRect,
1017                                 hrgnUpdate, flags);
1018
1019    UserDerefObjectCo(Wnd);
1020
1021    if (!NT_SUCCESS(Status))
1022    {
1023       /* IntRedrawWindow fails only in case that flags are invalid */
1024       SetLastWin32Error(ERROR_INVALID_PARAMETER);
1025       RETURN( FALSE);
1026    }
1027
1028    RETURN( TRUE);
1029
1030 CLEANUP:
1031    DPRINT("Leave NtUserRedrawWindow, ret=%i\n",_ret_);
1032    UserLeave();
1033    END_CLEANUP;
1034 }
1035
1036
1037
1038 static
1039 DWORD FASTCALL
1040 UserScrollDC(HDC hDC, INT dx, INT dy, const RECT *lprcScroll,
1041              const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate)
1042 {
1043    RECT rSrc, rClipped_src, rClip, rDst, offset;
1044    PDC DC;
1045
1046    /*
1047     * Compute device clipping region (in device coordinates).
1048     */
1049
1050    DC = DC_LockDc(hDC);
1051    if (NULL == DC)
1052    {
1053       return FALSE;
1054    }
1055    if (lprcScroll)
1056       rSrc = *lprcScroll;
1057    else
1058       IntGdiGetClipBox(hDC, &rSrc);
1059    IntLPtoDP(DC, (LPPOINT)&rSrc, 2);
1060
1061    if (lprcClip)
1062       rClip = *lprcClip;
1063    else
1064       IntGdiGetClipBox(hDC, &rClip);
1065    IntLPtoDP(DC, (LPPOINT)&rClip, 2);
1066
1067    IntGdiIntersectRect(&rClipped_src, &rSrc, &rClip);
1068
1069    rDst = rClipped_src;
1070    IntGdiSetRect(&offset, 0, 0, dx, dy);
1071    IntLPtoDP(DC, (LPPOINT)&offset, 2);
1072    IntGdiOffsetRect(&rDst, offset.right - offset.left,  offset.bottom - offset.top);
1073    IntGdiIntersectRect(&rDst, &rDst, &rClip);
1074
1075    /*
1076     * Copy bits, if possible.
1077     */
1078
1079    if (rDst.bottom > rDst.top && rDst.right > rDst.left)
1080    {
1081       RECT rDst_lp = rDst, rSrc_lp = rDst;
1082
1083       IntGdiOffsetRect(&rSrc_lp, offset.left - offset.right, offset.top - offset.bottom);
1084       IntDPtoLP(DC, (LPPOINT)&rDst_lp, 2);
1085       IntDPtoLP(DC, (LPPOINT)&rSrc_lp, 2);
1086       DC_UnlockDc(DC);
1087
1088       if (!NtGdiBitBlt(hDC, rDst_lp.left, rDst_lp.top, rDst_lp.right - rDst_lp.left,
1089                        rDst_lp.bottom - rDst_lp.top, hDC, rSrc_lp.left, rSrc_lp.top,
1090                        SRCCOPY))
1091          return FALSE;
1092    }
1093    else
1094    {
1095       DC_UnlockDc(DC);
1096    }
1097
1098    /*
1099     * Compute update areas.  This is the clipped source or'ed with the
1100     * unclipped source translated minus the clipped src translated (rDst)
1101     * all clipped to rClip.
1102     */
1103
1104    if (hrgnUpdate || lprcUpdate)
1105    {
1106       HRGN hRgn = hrgnUpdate, hRgn2;
1107
1108       if (hRgn)
1109          NtGdiSetRectRgn(hRgn, rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom);
1110       else
1111          hRgn = NtGdiCreateRectRgn(rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom);
1112
1113       hRgn2 = UnsafeIntCreateRectRgnIndirect(&rSrc);
1114       NtGdiOffsetRgn(hRgn2, offset.right - offset.left,  offset.bottom - offset.top);
1115       NtGdiCombineRgn(hRgn, hRgn, hRgn2, RGN_OR);
1116
1117       NtGdiSetRectRgn(hRgn2, rDst.left, rDst.top, rDst.right, rDst.bottom);
1118       NtGdiCombineRgn(hRgn, hRgn, hRgn2, RGN_DIFF);
1119
1120       NtGdiSetRectRgn(hRgn2, rClip.left, rClip.top, rClip.right, rClip.bottom);
1121       NtGdiCombineRgn(hRgn, hRgn, hRgn2, RGN_AND);
1122
1123       if (lprcUpdate)
1124       {
1125          NtGdiGetRgnBox(hRgn, lprcUpdate);
1126
1127          /* Put the lprcUpdate in logical coordinate */
1128          NtGdiDPtoLP(hDC, (LPPOINT)lprcUpdate, 2);
1129       }
1130       if (!hrgnUpdate)
1131          NtGdiDeleteObject(hRgn);
1132       NtGdiDeleteObject(hRgn2);
1133    }
1134    return TRUE;
1135 }
1136
1137
1138
1139
1140 /*
1141  * NtUserScrollDC
1142  *
1143  * Status
1144  *    @implemented
1145  */
1146
1147 DWORD STDCALL
1148 NtUserScrollDC(HDC hDC, INT dx, INT dy, const RECT *lprcScroll,
1149                const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate)
1150 {
1151    DECLARE_RETURN(DWORD);
1152
1153    DPRINT("Enter NtUserScrollDC\n");
1154    UserEnterExclusive();
1155
1156    RETURN( UserScrollDC(hDC, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate));
1157
1158 CLEANUP:
1159    DPRINT("Leave NtUserScrollDC, ret=%i\n",_ret_);
1160    UserLeave();
1161    END_CLEANUP;
1162
1163 }
1164
1165 /*
1166  * NtUserScrollWindowEx
1167  *
1168  * Status
1169  *    @implemented
1170  */
1171
1172 DWORD STDCALL
1173 NtUserScrollWindowEx(HWND hWnd, INT dx, INT dy, const RECT *UnsafeRect,
1174                      const RECT *UnsafeClipRect, HRGN hrgnUpdate, LPRECT rcUpdate, UINT flags)
1175 {
1176    RECT rc, cliprc, caretrc, rect, clipRect;
1177    INT Result;
1178    PWINDOW_OBJECT Window = NULL, CaretWnd;
1179    HDC hDC;
1180    HRGN hrgnTemp;
1181    HWND hwndCaret;
1182    BOOL bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
1183    BOOL bOwnRgn = TRUE;
1184    NTSTATUS Status;
1185    DECLARE_RETURN(DWORD);
1186
1187    DPRINT("Enter NtUserScrollWindowEx\n");
1188    UserEnterExclusive();
1189
1190    Window = UserGetWindowObject(hWnd);
1191    if (!Window || !IntIsWindowDrawable(Window))
1192    {
1193       Window = NULL; /* prevent deref at cleanup */
1194       RETURN( ERROR);
1195    }
1196    UserRefObjectCo(Window);
1197
1198    IntGetClientRect(Window, &rc);
1199
1200    if (NULL != UnsafeRect)
1201    {
1202       Status = MmCopyFromCaller(&rect, UnsafeRect, sizeof(RECT));
1203       if (! NT_SUCCESS(Status))
1204       {
1205          SetLastNtError(Status);
1206          RETURN( ERROR);
1207       }
1208       IntGdiIntersectRect(&rc, &rc, &rect);
1209    }
1210
1211    if (NULL != UnsafeClipRect)
1212    {
1213       Status = MmCopyFromCaller(&clipRect, UnsafeClipRect, sizeof(RECT));
1214       if (! NT_SUCCESS(Status))
1215       {
1216          SetLastNtError(Status);
1217          RETURN( ERROR);
1218       }
1219       IntGdiIntersectRect(&cliprc, &rc, &clipRect);
1220    }
1221    else
1222       cliprc = rc;
1223
1224    if (cliprc.right <= cliprc.left || cliprc.bottom <= cliprc.top ||
1225          (dx == 0 && dy == 0))
1226    {
1227       RETURN( NULLREGION);
1228    }
1229
1230    caretrc = rc;
1231    hwndCaret = co_IntFixCaret(Window, &caretrc, flags);
1232
1233    if (hrgnUpdate)
1234       bOwnRgn = FALSE;
1235    else if (bUpdate)
1236       hrgnUpdate = NtGdiCreateRectRgn(0, 0, 0, 0);
1237
1238    hDC = UserGetDCEx(Window, 0, DCX_CACHE | DCX_USESTYLE);
1239    if (hDC)
1240    {
1241       UserScrollDC(hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate);
1242       UserReleaseDC(Window, hDC, FALSE);
1243    }
1244
1245    /*
1246     * Take into account the fact that some damage may have occurred during
1247     * the scroll.
1248     */
1249
1250    hrgnTemp = NtGdiCreateRectRgn(0, 0, 0, 0);
1251    Result = co_UserGetUpdateRgn(Window, hrgnTemp, FALSE);
1252    if (Result != NULLREGION)
1253    {
1254       HRGN hrgnClip = UnsafeIntCreateRectRgnIndirect(&cliprc);
1255       NtGdiOffsetRgn(hrgnTemp, dx, dy);
1256       NtGdiCombineRgn(hrgnTemp, hrgnTemp, hrgnClip, RGN_AND);
1257       co_UserRedrawWindow(Window, NULL, hrgnTemp, RDW_INVALIDATE | RDW_ERASE);
1258       NtGdiDeleteObject(hrgnClip);
1259    }
1260
1261    NtGdiDeleteObject(hrgnTemp);
1262
1263    if (flags & SW_SCROLLCHILDREN)
1264    {
1265       HWND *List = IntWinListChildren(Window);
1266       if (List)
1267       {
1268          int i;
1269          RECT r, dummy;
1270          POINT ClientOrigin;
1271          PWINDOW_OBJECT Wnd;
1272
1273          IntGetClientOrigin(Window, &ClientOrigin);
1274          for (i = 0; List[i]; i++)
1275          {
1276             if (!(Wnd = UserGetWindowObject(List[i])))
1277                continue;
1278
1279             r = Wnd->WindowRect;
1280             r.left -= ClientOrigin.x;
1281             r.top -= ClientOrigin.y;
1282             r.right -= ClientOrigin.x;
1283             r.bottom -= ClientOrigin.y;
1284
1285             if (! UnsafeRect || IntGdiIntersectRect(&dummy, &r, &rc))
1286             {
1287                UserRefObjectCo(Wnd);
1288                co_WinPosSetWindowPos(Wnd, 0, r.left + dx, r.top + dy, 0, 0,
1289                                      SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
1290                                      SWP_NOREDRAW);
1291                UserDerefObjectCo(Wnd);
1292             }
1293
1294          }
1295          ExFreePool(List);
1296       }
1297    }
1298
1299    if (flags & (SW_INVALIDATE | SW_ERASE))
1300       co_UserRedrawWindow(Window, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE |
1301                           ((flags & SW_ERASE) ? RDW_ERASENOW : 0) |
1302                           ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0));
1303
1304    if (bOwnRgn && hrgnUpdate)
1305       NtGdiDeleteObject(hrgnUpdate);
1306
1307    if ((CaretWnd = UserGetWindowObject(hwndCaret)))
1308    {
1309       UserRefObjectCo(CaretWnd);
1310
1311       co_IntSetCaretPos(caretrc.left + dx, caretrc.top + dy);
1312       co_UserShowCaret(CaretWnd);
1313
1314       UserDerefObjectCo(CaretWnd);
1315    }
1316
1317    RETURN( Result);
1318
1319 CLEANUP:
1320    if (Window)
1321       UserDerefObjectCo(Window);
1322
1323    DPRINT("Leave NtUserScrollWindowEx, ret=%i\n",_ret_);
1324    UserLeave();
1325    END_CLEANUP;
1326 }
1327
1328 /* EOF */