reactos/subsystems/win32/win32k/ntuser/windc.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 classes
  24  * FILE:             subsys/win32k/ntuser/class.c
  25  * PROGRAMER:        Casper S. Hornstrup (chorns@users.sourceforge.net)
  26  * REVISION HISTORY:
  27  *       06-06-2001  CSH  Created
  28  */
  29
  30 /* INCLUDES ******************************************************************/
  31
  32 #include <w32k.h>
  33
  34 #define NDEBUG
  35 #include <debug.h>
  36
  37 /* GLOBALS *******************************************************************/
  38
  39 /* NOTE - I think we should store this per window station (including gdi objects) */
  40
  41 static PDCE FirstDce = NULL;
  42 static HDC defaultDCstate = NULL;
  43 //static INT DCECount = 0;
  44
  45 #define DCX_CACHECOMPAREMASK (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | \
  46                               DCX_CACHE | DCX_WINDOW | DCX_PARENTCLIP)
  47
  48 /* FUNCTIONS *****************************************************************/
  49
  50 HDC FASTCALL
  51 DceCreateDisplayDC(VOID)
  52 {
  53     HDC hDC;
  54     UNICODE_STRING DriverName;
  55     RtlInitUnicodeString(&DriverName, L"DISPLAY");
  56     hDC = IntGdiCreateDC(&DriverName, NULL, NULL, NULL, FALSE);
  57     return hDC;
  58 }
  59
  60 VOID FASTCALL
  61 DceInit(VOID)
  62 {
  63
  64 }
  65
  66 static
  67 HRGN FASTCALL
  68 DceGetVisRgn(PWINDOW_OBJECT Window, ULONG Flags, HWND hWndChild, ULONG CFlags)
  69 {
  70    HRGN VisRgn;
  71
  72    VisRgn = VIS_ComputeVisibleRegion(Window,
  73                                      0 == (Flags & DCX_WINDOW),
  74                                      0 != (Flags & DCX_CLIPCHILDREN),
  75                                      0 != (Flags & DCX_CLIPSIBLINGS));
  76
  77    if (VisRgn == NULL)
  78       VisRgn = NtGdiCreateRectRgn(0, 0, 0, 0);
  79
  80    return VisRgn;
  81 }
  82
  83 /*
  84  * NtUserGetWindowDC
  85  *
  86  * The NtUserGetWindowDC function retrieves the device context (DC) for the
  87  * entire window, including title bar, menus, and scroll bars. A window device
  88  * context permits painting anywhere in a window, because the origin of the
  89  * device context is the upper-left corner of the window instead of the client
  90  * area.
  91  *
  92  * Status
  93  *    @implemented
  94  */
  95
  96 DWORD STDCALL
  97 NtUserGetWindowDC(HWND hWnd)
  98 {
  99    return (DWORD)NtUserGetDCEx(hWnd, 0, DCX_USESTYLE | DCX_WINDOW);
 100 }
 101
 102 DWORD FASTCALL
 103 UserGetWindowDC(PWINDOW_OBJECT Wnd)
 104 {
 105    return (DWORD)UserGetDCEx(Wnd, 0, DCX_USESTYLE | DCX_WINDOW);
 106 }
 107
 108 HDC STDCALL
 109 NtUserGetDC(HWND hWnd)
 110 {
 111    return NtUserGetDCEx(hWnd, NULL, NULL == hWnd ? DCX_CACHE | DCX_WINDOW : DCX_USESTYLE);
 112 }
 113
 114 PDCE FASTCALL
 115 DceAllocDCE(PWINDOW_OBJECT Window OPTIONAL, DCE_TYPE Type)
 116 {
 117     PDCE pDce;
 118
 119     pDce = ExAllocatePoolWithTag(PagedPool, sizeof(DCE), TAG_PDCE);
 120     if(!pDce)
 121         return NULL;
 122
 123     pDce->hDC = DceCreateDisplayDC();
 124     if(!pDce->hDC)
 125     {
 126       ExFreePoolWithTag(pDce, TAG_PDCE);
 127       return NULL;
 128     }
 129
 130     if (NULL == defaultDCstate) // Ultra HAX! Dedicated to GvG!
 131       { // This is a cheesy way to do this.
 132         // But, due to the right way of creating gdi handles there is no choice.
 133       defaultDCstate = IntGdiGetDCState(pDce->hDC);
 134       DC_SetOwnership( defaultDCstate, NULL);
 135     }
 136
 137     pDce->hwndCurrent = (Window ? Window->hSelf : NULL);
 138     pDce->hClipRgn = NULL;
 139     pDce->pProcess = NULL;
 140
 141     pDce->next = FirstDce;
 142     FirstDce = pDce;
 143
 144     if (Type == DCE_WINDOW_DC) //Window DCE have ownership.
 145      {
 146        DC_SetOwnership(pDce->hDC, PsGetCurrentProcess());
 147        pDce->pProcess = PsGetCurrentProcess();
 148      }
 149     else
 150     {
 151        DC_SetOwnership(pDce->hDC, NULL); // This hDC is inaccessible!
 152     }
 153
 154      if (Type != DCE_CACHE_DC)
 155      {
 156        pDce->DCXFlags = DCX_DCEBUSY;
 157
 158         if (Window)
 159         {
 160            if (Window->Style & WS_CLIPCHILDREN)
 161            {
 162              pDce->DCXFlags |= DCX_CLIPCHILDREN;
 163            }
 164            if (Window->Style & WS_CLIPSIBLINGS)
 165            {
 166              pDce->DCXFlags |= DCX_CLIPSIBLINGS;
 167            }
 168         }
 169      }
 170      else
 171      {
 172        pDce->DCXFlags = DCX_CACHE | DCX_DCEEMPTY;
 173      }
 174
 175     return(pDce);
 176 }
 177
 178 VOID static STDCALL
 179 DceSetDrawable(PWINDOW_OBJECT Window OPTIONAL, HDC hDC, ULONG Flags,
 180                BOOL SetClipOrigin)
 181 {
 182    DC *dc = DC_LockDc(hDC);
 183    if(!dc)
 184       return;
 185
 186    if (Window == NULL)
 187    {
 188       dc->w.DCOrgX = 0;
 189       dc->w.DCOrgY = 0;
 190    }
 191    else
 192    {
 193       if (Flags & DCX_WINDOW)
 194       {
 195          dc->w.DCOrgX = Window->WindowRect.left;
 196          dc->w.DCOrgY = Window->WindowRect.top;
 197       }
 198       else
 199       {
 200          dc->w.DCOrgX = Window->ClientRect.left;
 201          dc->w.DCOrgY = Window->ClientRect.top;
 202       }
 203    }
 204    DC_UnlockDc(dc);
 205 }
 206
 207
 208 static VOID FASTCALL
 209 DceDeleteClipRgn(DCE* Dce)
 210 {
 211    Dce->DCXFlags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN);
 212
 213    if (Dce->DCXFlags & DCX_KEEPCLIPRGN )
 214    {
 215       Dce->DCXFlags &= ~DCX_KEEPCLIPRGN;
 216    }
 217    else if (Dce->hClipRgn != NULL)
 218    {
 219       NtGdiDeleteObject(Dce->hClipRgn);
 220    }
 221
 222    Dce->hClipRgn = NULL;
 223
 224    /* make it dirty so that the vis rgn gets recomputed next time */
 225    Dce->DCXFlags |= DCX_DCEDIRTY;
 226 }
 227
 228 static INT FASTCALL
 229 DceReleaseDC(DCE* dce, BOOL EndPaint)
 230 {
 231    if (DCX_DCEBUSY != (dce->DCXFlags & (DCX_DCEEMPTY | DCX_DCEBUSY)))
 232    {
 233       return 0;
 234    }
 235
 236    /* restore previous visible region */
 237
 238    if ((dce->DCXFlags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) &&
 239          ((dce->DCXFlags & DCX_CACHE) || EndPaint))
 240    {
 241       DceDeleteClipRgn(dce);
 242    }
 243
 244    if (dce->DCXFlags & DCX_CACHE)
 245    {
 246       /* make the DC clean so that SetDCState doesn't try to update the vis rgn */
 247       IntGdiSetHookFlags(dce->hDC, DCHF_VALIDATEVISRGN);
 248
 249       if( dce->pProcess ) // Attempt to fix Dc_Attr problem.
 250         DC_SetOwnership( defaultDCstate, dce->pProcess);
 251       else
 252         DC_SetOwnership( defaultDCstate, PsGetCurrentProcess());
 253
 254       NtGdiSetDCState(dce->hDC, defaultDCstate);
 255       DC_SetOwnership( defaultDCstate, NULL); // Return default dc state to inaccessible mode.
 256
 257       dce->DCXFlags &= ~DCX_DCEBUSY;
 258       if (dce->DCXFlags & DCX_DCEDIRTY)
 259       {
 260          /* don't keep around invalidated entries
 261           * because SetDCState() disables hVisRgn updates
 262           * by removing dirty bit. */
 263          dce->hwndCurrent = 0;
 264          dce->DCXFlags &= DCX_CACHE;
 265          dce->DCXFlags |= DCX_DCEEMPTY;
 266       }
 267    }
 268    return 1;
 269 }
 270
 271 static VOID FASTCALL
 272 DceUpdateVisRgn(DCE *Dce, PWINDOW_OBJECT Window, ULONG Flags)
 273 {
 274    HANDLE hRgnVisible = NULL;
 275    ULONG DcxFlags;
 276    PWINDOW_OBJECT DesktopWindow;
 277
 278    if (Flags & DCX_PARENTCLIP)
 279    {
 280       PWINDOW_OBJECT Parent;
 281
 282       Parent = Window->Parent;
 283       if(!Parent)
 284       {
 285          hRgnVisible = NULL;
 286          goto noparent;
 287       }
 288
 289       if (Parent->Style & WS_CLIPSIBLINGS)
 290       {
 291          DcxFlags = DCX_CLIPSIBLINGS |
 292                     (Flags & ~(DCX_CLIPCHILDREN | DCX_WINDOW));
 293       }
 294       else
 295       {
 296          DcxFlags = Flags & ~(DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | DCX_WINDOW);
 297       }
 298       hRgnVisible = DceGetVisRgn(Parent, DcxFlags, Window->hSelf, Flags);
 299    }
 300    else if (Window == NULL)
 301    {
 302       DesktopWindow = UserGetWindowObject(IntGetDesktopWindow());
 303       if (NULL != DesktopWindow)
 304       {
 305          hRgnVisible = UnsafeIntCreateRectRgnIndirect(&DesktopWindow->WindowRect);
 306       }
 307       else
 308       {
 309          hRgnVisible = NULL;
 310       }
 311    }
 312    else
 313    {
 314       hRgnVisible = DceGetVisRgn(Window, Flags, 0, 0);
 315    }
 316
 317 noparent:
 318    if (Flags & DCX_INTERSECTRGN)
 319    {
 320       if(Dce->hClipRgn != NULL)
 321       {
 322          NtGdiCombineRgn(hRgnVisible, hRgnVisible, Dce->hClipRgn, RGN_AND);
 323       }
 324       else
 325       {
 326          if(hRgnVisible != NULL)
 327          {
 328             NtGdiDeleteObject(hRgnVisible);
 329          }
 330          hRgnVisible = NtGdiCreateRectRgn(0, 0, 0, 0);
 331       }
 332    }
 333
 334    if (Flags & DCX_EXCLUDERGN && Dce->hClipRgn != NULL)
 335    {
 336       NtGdiCombineRgn(hRgnVisible, hRgnVisible, Dce->hClipRgn, RGN_DIFF);
 337    }
 338
 339    Dce->DCXFlags &= ~DCX_DCEDIRTY;
 340    IntGdiSelectVisRgn(Dce->hDC, hRgnVisible);
 341
 342    if (Window != NULL)
 343    {
 344       IntEngWindowChanged(Window, WOC_RGN_CLIENT);
 345    }
 346
 347    if (hRgnVisible != NULL)
 348    {
 349       NtGdiDeleteObject(hRgnVisible);
 350    }
 351 }
 352
 353 HDC FASTCALL
 354 UserGetDCEx(PWINDOW_OBJECT Window OPTIONAL, HANDLE ClipRegion, ULONG Flags)
 355 {
 356    PWINDOW_OBJECT Parent;
 357    ULONG DcxFlags;
 358    DCE* Dce;
 359    BOOL UpdateVisRgn = TRUE;
 360    BOOL UpdateClipOrigin = FALSE;
 361
 362    if (NULL == Window)
 363    {
 364       Flags &= ~DCX_USESTYLE;
 365    }
 366
 367    if (NULL == Window || NULL == Window->Dce)
 368    {
 369       Flags |= DCX_CACHE;
 370    }
 371
 372    if (Flags & DCX_USESTYLE)
 373    {
 374       Flags &= ~(DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP);
 375
 376       if (Window->Style & WS_CLIPSIBLINGS)
 377       {
 378          Flags |= DCX_CLIPSIBLINGS;
 379       }
 380
 381       if (!(Flags & DCX_WINDOW))
 382       {
 383          if (Window->Class->Style & CS_PARENTDC)
 384          {
 385             Flags |= DCX_PARENTCLIP;
 386          }
 387
 388          if (Window->Style & WS_CLIPCHILDREN &&
 389                !(Window->Style & WS_MINIMIZE))
 390          {
 391             Flags |= DCX_CLIPCHILDREN;
 392          }
 393       }
 394       else
 395       {
 396          Flags |= DCX_CACHE;
 397       }
 398    }
 399
 400    if (Flags & DCX_NOCLIPCHILDREN)
 401    {
 402       Flags |= DCX_CACHE;
 403       Flags |= ~(DCX_PARENTCLIP | DCX_CLIPCHILDREN);
 404    }
 405
 406    if (Flags & DCX_WINDOW)
 407    {
 408       Flags = (Flags & ~DCX_CLIPCHILDREN) | DCX_CACHE;
 409    }
 410
 411    Parent = (Window ? Window->Parent : NULL);
 412
 413    if (NULL == Window || !(Window->Style & WS_CHILD) || NULL == Parent)
 414    {
 415       Flags &= ~DCX_PARENTCLIP;
 416    }
 417    else if (Flags & DCX_PARENTCLIP)
 418    {
 419       Flags |= DCX_CACHE;
 420       if ((Window->Style & WS_VISIBLE) &&
 421             (Parent->Style & WS_VISIBLE))
 422       {
 423          Flags &= ~DCX_CLIPCHILDREN;
 424          if (Parent->Style & WS_CLIPSIBLINGS)
 425          {
 426             Flags |= DCX_CLIPSIBLINGS;
 427          }
 428       }
 429    }
 430
 431    DcxFlags = Flags & DCX_CACHECOMPAREMASK;
 432
 433    if (Flags & DCX_CACHE)
 434    {
 435       DCE* DceEmpty = NULL;
 436       DCE* DceUnused = NULL;
 437
 438       for (Dce = FirstDce; Dce != NULL; Dce = Dce->next)
 439       {
 440          if ((Dce->DCXFlags & (DCX_CACHE | DCX_DCEBUSY)) == DCX_CACHE)
 441          {
 442             DceUnused = Dce;
 443             if (Dce->DCXFlags & DCX_DCEEMPTY)
 444             {
 445                DceEmpty = Dce;
 446             }
 447             else if (Dce->hwndCurrent == (Window ? Window->hSelf : NULL) &&
 448                      ((Dce->DCXFlags & DCX_CACHECOMPAREMASK) == DcxFlags))
 449             {
 450 #if 0 /* FIXME */
 451                UpdateVisRgn = FALSE;
 452 #endif
 453
 454                UpdateClipOrigin = TRUE;
 455                break;
 456             }
 457          }
 458       }
 459
 460
 461       if (Dce == NULL)
 462       {
 463          Dce = (DceEmpty == NULL) ? DceUnused : DceEmpty;
 464       }
 465
 466       if (Dce == NULL)
 467       {
 468          Dce = DceAllocDCE(NULL, DCE_CACHE_DC);
 469       }
 470    }
 471    else
 472    {
 473       Dce = Window->Dce;
 474       if (NULL != Dce && Dce->hwndCurrent == (Window ? Window->hSelf : NULL))
 475       {
 476          UpdateVisRgn = FALSE; /* updated automatically, via DCHook() */
 477       }
 478 #if 1 /* FIXME */
 479       UpdateVisRgn = TRUE;
 480 #endif
 481
 482    }
 483
 484    if (NULL == Dce)
 485    {
 486       return(NULL);
 487    }
 488
 489    Dce->hwndCurrent = (Window ? Window->hSelf : NULL);
 490    Dce->DCXFlags = Flags | DCX_DCEBUSY;
 491
 492    if (0 == (Flags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN)) && NULL != ClipRegion)
 493    {
 494       if (Flags & DCX_KEEPCLIPRGN)
 495          NtGdiDeleteObject(ClipRegion);
 496       ClipRegion = NULL;
 497    }
 498
 499 #if 0
 500    if (NULL != Dce->hClipRgn)
 501    {
 502       DceDeleteClipRgn(Dce);
 503       Dce->hClipRgn = NULL;
 504    }
 505 #endif
 506
 507    if (0 != (Flags & DCX_INTERSECTUPDATE) && NULL == ClipRegion)
 508    {
 509       Flags |= DCX_INTERSECTRGN | DCX_KEEPCLIPRGN;
 510       Dce->DCXFlags |= DCX_INTERSECTRGN | DCX_KEEPCLIPRGN;
 511       ClipRegion = Window->UpdateRegion;
 512    }
 513
 514    if (ClipRegion == (HRGN) 1)
 515    {
 516       if (!(Flags & DCX_WINDOW))
 517       {
 518          Dce->hClipRgn = UnsafeIntCreateRectRgnIndirect(&Window->ClientRect);
 519       }
 520       else
 521       {
 522          Dce->hClipRgn = UnsafeIntCreateRectRgnIndirect(&Window->WindowRect);
 523       }
 524    }
 525    else if (ClipRegion != NULL)
 526    {
 527       Dce->hClipRgn = ClipRegion;
 528    }
 529
 530    DceSetDrawable(Window, Dce->hDC, Flags, UpdateClipOrigin);
 531
 532    //  if (UpdateVisRgn)
 533    {
 534       DceUpdateVisRgn(Dce, Window, Flags);
 535    }
 536
 537    return(Dce->hDC);
 538 }
 539
 540
 541
 542 HDC STDCALL
 543 NtUserGetDCEx(HWND hWnd OPTIONAL, HANDLE ClipRegion, ULONG Flags)
 544 {
 545    PWINDOW_OBJECT Wnd=NULL;
 546    DECLARE_RETURN(HDC);
 547
 548    DPRINT("Enter NtUserGetDCEx\n");
 549    UserEnterExclusive();
 550
 551    if (hWnd && !(Wnd = UserGetWindowObject(hWnd)))
 552    {
 553       RETURN(NULL);
 554    }
 555
 556    RETURN( UserGetDCEx(Wnd, ClipRegion, Flags));
 557
 558 CLEANUP:
 559    DPRINT("Leave NtUserGetDCEx, ret=%i\n",_ret_);
 560    UserLeave();
 561    END_CLEANUP;
 562 }
 563
 564
 565 BOOL FASTCALL
 566 DCE_Cleanup(PDCE pDce)
 567 {
 568    PDCE PrevInList;
 569
 570    if (pDce == FirstDce)
 571    {
 572       FirstDce = pDce->next;
 573       PrevInList = pDce;
 574    }
 575    else
 576    {
 577       for (PrevInList = FirstDce; NULL != PrevInList; PrevInList = PrevInList->next)
 578       {
 579          if (pDce == PrevInList->next)
 580          {
 581             PrevInList->next = pDce->next;
 582             break;
 583          }
 584       }
 585       assert(NULL != PrevInList);
 586    }
 587
 588    return NULL != PrevInList;
 589 }
 590
 591 HWND FASTCALL
 592 IntWindowFromDC(HDC hDc)
 593 {
 594    DCE *Dce;
 595
 596    for (Dce = FirstDce; Dce != NULL; Dce = Dce->next)
 597    {
 598       if(Dce->hDC == hDc)
 599       {
 600          return Dce->hwndCurrent;
 601       }
 602    }
 603
 604    return 0;
 605 }
 606
 607
 608 INT FASTCALL
 609 UserReleaseDC(PWINDOW_OBJECT Window, HDC hDc, BOOL EndPaint)
 610 {
 611    DCE *dce;
 612    INT nRet = 0;
 613
 614    dce = FirstDce;
 615
 616    DPRINT("%p %p\n", Window, hDc);
 617
 618    while (dce && (dce->hDC != hDc))
 619    {
 620       dce = dce->next;
 621    }
 622
 623    if (dce && (dce->DCXFlags & DCX_DCEBUSY))
 624    {
 625       nRet = DceReleaseDC(dce, EndPaint);
 626    }
 627
 628    return nRet;
 629 }
 630
 631
 632 // Win 3.1 throw back, hWnd should be ignored and not used.
 633 // Replace with NtUserCallOneParam ((DWORD) hDC, ONEPARAM_ROUTINE_RELEASEDC);
 634 INT STDCALL
 635 NtUserReleaseDC(HWND hWnd, HDC hDc)
 636 {
 637    DECLARE_RETURN(INT);
 638
 639    DPRINT("Enter NtUserReleaseDC\n");
 640    UserEnterExclusive();
 641
 642    RETURN(UserReleaseDC(NULL, hDc, FALSE));
 643
 644 CLEANUP:
 645    DPRINT("Leave NtUserReleaseDC, ret=%i\n",_ret_);
 646    UserLeave();
 647    END_CLEANUP;
 648 }
 649
 650 /***********************************************************************
 651  *           DceFreeDCE
 652  */
 653 PDCE FASTCALL
 654 DceFreeDCE(PDCE pdce, BOOLEAN Force)
 655   {
 656      DCE *ret;
 657
 658    if (NULL == pdce)
 659      {
 660         return NULL;
 661      }
 662
 663    ret = pdce->next;
 664
 665   #if 0 /* FIXME */
 666
 667    SetDCHook(pdce->hDC, NULL, 0L);
 668   #endif
 669
 670    if(Force && !GDIOBJ_OwnedByCurrentProcess(GdiHandleTable, pdce->hDC))
 671      {
 672       DC_SetOwnership( pdce->hDC, PsGetCurrentProcess());
 673      }
 674
 675    NtGdiDeleteObjectApp(pdce->hDC);
 676    if (pdce->hClipRgn && ! (pdce->DCXFlags & DCX_KEEPCLIPRGN))
 677      {
 678       NtGdiDeleteObject(pdce->hClipRgn);
 679      }
 680
 681    DCE_Cleanup(pdce);
 682    ExFreePoolWithTag(pdce, TAG_PDCE);
 683      return ret;
 684 }
 685
 686 /***********************************************************************
 687  *           DceFreeWindowDCE
 688  *
 689  * Remove owned DCE and reset unreleased cache DCEs.
 690  */
 691 void FASTCALL
 692 DceFreeWindowDCE(PWINDOW_OBJECT Window)
 693 {
 694    DCE *pDCE;
 695
 696    pDCE = FirstDce;
 697    while (pDCE)
 698    {
 699       if (pDCE->hwndCurrent == Window->hSelf)
 700       {
 701          if (pDCE == Window->Dce) /* owned or Class DCE*/
 702          {
 703             if (Window->Class->Style & CS_OWNDC) /* owned DCE*/
 704             {
 705                pDCE = DceFreeDCE(pDCE, FALSE);
 706                Window->Dce = NULL;
 707                continue;
 708             }
 709             else if (pDCE->DCXFlags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) /* Class DCE*/
 710             {
 711                DceDeleteClipRgn(pDCE);
 712                pDCE->hwndCurrent = 0;
 713             }
 714          }
 715          else
 716          {
 717             if (pDCE->DCXFlags & DCX_DCEBUSY) /* shared cache DCE */
 718             {
 719                /* FIXME: AFAICS we are doing the right thing here so
 720                 * this should be a DPRINT. But this is best left as an ERR
 721                 * because the 'application error' is likely to come from
 722                 * another part of Wine (i.e. it's our fault after all).
 723                 * We should change this to DPRINT when ReactOS is more stable
 724                 * (for 1.0?).
 725                 */
 726                DPRINT1("[%p] GetDC() without ReleaseDC()!\n", Window->hSelf);
 727                DceReleaseDC(pDCE, FALSE);
 728             }
 729
 730             pDCE->DCXFlags &= DCX_CACHE;
 731             pDCE->DCXFlags |= DCX_DCEEMPTY;
 732             pDCE->hwndCurrent = 0;
 733          }
 734       }
 735       pDCE = pDCE->next;
 736    }
 737 }
 738
 739 VOID FASTCALL
 740 DceEmptyCache()
 741 {
 742    while (FirstDce != NULL)
 743    {
 744       FirstDce = DceFreeDCE(FirstDce, TRUE);
 745    }
 746 }
 747
 748 VOID FASTCALL
 749 DceResetActiveDCEs(PWINDOW_OBJECT Window)
 750 {
 751    DCE *pDCE;
 752    PDC dc;
 753    PWINDOW_OBJECT CurrentWindow;
 754    INT DeltaX;
 755    INT DeltaY;
 756
 757    if (NULL == Window)
 758    {
 759       return;
 760    }
 761
 762    pDCE = FirstDce;
 763    while (pDCE)
 764    {
 765       if (0 == (pDCE->DCXFlags & DCX_DCEEMPTY))
 766       {
 767          if (Window->hSelf == pDCE->hwndCurrent)
 768          {
 769             CurrentWindow = Window;
 770          }
 771          else
 772          {
 773             CurrentWindow = UserGetWindowObject(pDCE->hwndCurrent);
 774             if (NULL == CurrentWindow)
 775             {
 776                pDCE = pDCE->next;
 777                continue;
 778             }
 779          }
 780
 781          dc = DC_LockDc(pDCE->hDC);
 782          if (dc == NULL)
 783          {
 784 //            if (Window->hSelf != pDCE->hwndCurrent)
 785 //            {
 786 //               UserDerefObject(CurrentWindow);
 787 //            }
 788             pDCE = pDCE->next;
 789             continue;
 790          }
 791          if (Window == CurrentWindow || IntIsChildWindow(Window, CurrentWindow))
 792          {
 793             if (pDCE->DCXFlags & DCX_WINDOW)
 794             {
 795                DeltaX = CurrentWindow->WindowRect.left - dc->w.DCOrgX;
 796                DeltaY = CurrentWindow->WindowRect.top - dc->w.DCOrgY;
 797                dc->w.DCOrgX = CurrentWindow->WindowRect.left;
 798                dc->w.DCOrgY = CurrentWindow->WindowRect.top;
 799             }
 800             else
 801             {
 802                DeltaX = CurrentWindow->ClientRect.left - dc->w.DCOrgX;
 803                DeltaY = CurrentWindow->ClientRect.top - dc->w.DCOrgY;
 804                dc->w.DCOrgX = CurrentWindow->ClientRect.left;
 805                dc->w.DCOrgY = CurrentWindow->ClientRect.top;
 806             }
 807             if (NULL != dc->w.hClipRgn)
 808             {
 809                int FASTCALL CLIPPING_UpdateGCRegion(DC* Dc);
 810                NtGdiOffsetRgn(dc->w.hClipRgn, DeltaX, DeltaY);
 811                CLIPPING_UpdateGCRegion(dc);
 812             }
 813             if (NULL != pDCE->hClipRgn)
 814             {
 815                NtGdiOffsetRgn(pDCE->hClipRgn, DeltaX, DeltaY);
 816             }
 817          }
 818          DC_UnlockDc(dc);
 819
 820          DceUpdateVisRgn(pDCE, CurrentWindow, pDCE->DCXFlags);
 821
 822          if (Window->hSelf != pDCE->hwndCurrent)
 823          {
 824             //              IntEngWindowChanged(CurrentWindow, WOC_RGN_CLIENT);
 825 //            UserDerefObject(CurrentWindow);
 826          }
 827       }
 828
 829       pDCE = pDCE->next;
 830    }
 831
 832 }
 833
 834
 835 #define COPY_DEVMODE_VALUE_TO_CALLER(dst, src, member) \
 836     Status = MmCopyToCaller(&(dst)->member, &(src)->member, sizeof ((src)->member)); \
 837     if (!NT_SUCCESS(Status)) \
 838     { \
 839       SetLastNtError(Status); \
 840       ExFreePool(src); \
 841       return FALSE; \
 842     }
 843
 844 BOOL
 845 STDCALL
 846 NtUserEnumDisplaySettings(
 847    PUNICODE_STRING lpszDeviceName,
 848    DWORD iModeNum,
 849    LPDEVMODEW lpDevMode, /* FIXME is this correct? */
 850    DWORD dwFlags )
 851 {
 852    NTSTATUS Status;
 853    LPDEVMODEW pSafeDevMode;
 854    PUNICODE_STRING pSafeDeviceName = NULL;
 855    UNICODE_STRING SafeDeviceName;
 856    USHORT Size = 0, ExtraSize = 0;
 857
 858    /* Copy the devmode */
 859    Status = MmCopyFromCaller(&Size, &lpDevMode->dmSize, sizeof (Size));
 860    if (!NT_SUCCESS(Status))
 861    {
 862       SetLastNtError(Status);
 863       return FALSE;
 864    }
 865    Status = MmCopyFromCaller(&ExtraSize, &lpDevMode->dmDriverExtra, sizeof (ExtraSize));
 866    if (!NT_SUCCESS(Status))
 867    {
 868       SetLastNtError(Status);
 869       return FALSE;
 870    }
 871    pSafeDevMode = ExAllocatePool(PagedPool, Size + ExtraSize);
 872    if (pSafeDevMode == NULL)
 873    {
 874       SetLastWin32Error(ERROR_NOT_ENOUGH_MEMORY);
 875       return FALSE;
 876    }
 877    pSafeDevMode->dmSize = Size;
 878    pSafeDevMode->dmDriverExtra = ExtraSize;
 879
 880    /* Copy the device name */
 881    if (lpszDeviceName != NULL)
 882    {
 883       Status = IntSafeCopyUnicodeString(&SafeDeviceName, lpszDeviceName);
 884       if (!NT_SUCCESS(Status))
 885       {
 886          ExFreePool(pSafeDevMode);
 887          SetLastNtError(Status);
 888          return FALSE;
 889       }
 890       pSafeDeviceName = &SafeDeviceName;
 891    }
 892
 893    /* Call internal function */
 894    if (!IntEnumDisplaySettings(pSafeDeviceName, iModeNum, pSafeDevMode, dwFlags))
 895    {
 896       if (pSafeDeviceName != NULL)
 897          RtlFreeUnicodeString(pSafeDeviceName);
 898       ExFreePool(pSafeDevMode);
 899       return FALSE;
 900    }
 901    if (pSafeDeviceName != NULL)
 902       RtlFreeUnicodeString(pSafeDeviceName);
 903
 904    /* Copy some information back */
 905    COPY_DEVMODE_VALUE_TO_CALLER(lpDevMode, pSafeDevMode, dmPelsWidth);
 906    COPY_DEVMODE_VALUE_TO_CALLER(lpDevMode, pSafeDevMode, dmPelsHeight);
 907    COPY_DEVMODE_VALUE_TO_CALLER(lpDevMode, pSafeDevMode, dmBitsPerPel);
 908    COPY_DEVMODE_VALUE_TO_CALLER(lpDevMode, pSafeDevMode, dmDisplayFrequency);
 909    COPY_DEVMODE_VALUE_TO_CALLER(lpDevMode, pSafeDevMode, dmDisplayFlags);
 910
 911    /* output private/extra driver data */
 912    if (ExtraSize > 0)
 913    {
 914       Status = MmCopyToCaller((PCHAR)lpDevMode + Size, (PCHAR)pSafeDevMode + Size, ExtraSize);
 915       if (!NT_SUCCESS(Status))
 916       {
 917          SetLastNtError(Status);
 918          ExFreePool(pSafeDevMode);
 919          return FALSE;
 920       }
 921    }
 922
 923    ExFreePool(pSafeDevMode);
 924    return TRUE;
 925 }
 926
 927 #undef COPY_DEVMODE_VALUE_TO_CALLER
 928
 929
 930 LONG
 931 STDCALL
 932 NtUserChangeDisplaySettings(
 933    PUNICODE_STRING lpszDeviceName,
 934    LPDEVMODEW lpDevMode,
 935    HWND hwnd,
 936    DWORD dwflags,
 937    LPVOID lParam)
 938 {
 939    NTSTATUS Status;
 940    DEVMODEW DevMode;
 941    PUNICODE_STRING pSafeDeviceName = NULL;
 942    UNICODE_STRING SafeDeviceName;
 943    LONG Ret;
 944
 945    /* Check arguments */
 946 #ifdef CDS_VIDEOPARAMETERS
 947
 948    if (dwflags != CDS_VIDEOPARAMETERS && lParam != NULL)
 949 #else
 950
 951    if (lParam != NULL)
 952 #endif
 953
 954    {
 955       SetLastWin32Error(ERROR_INVALID_PARAMETER);
 956       return DISP_CHANGE_BADPARAM;
 957    }
 958    if (hwnd != NULL)
 959    {
 960       SetLastWin32Error(ERROR_INVALID_PARAMETER);
 961       return DISP_CHANGE_BADPARAM;
 962    }
 963
 964    /* Copy devmode */
 965    Status = MmCopyFromCaller(&DevMode.dmSize, &lpDevMode->dmSize, sizeof (DevMode.dmSize));
 966    if (!NT_SUCCESS(Status))
 967    {
 968       SetLastNtError(Status);
 969       return DISP_CHANGE_BADPARAM;
 970    }
 971    DevMode.dmSize = min(sizeof (DevMode), DevMode.dmSize);
 972    Status = MmCopyFromCaller(&DevMode, lpDevMode, DevMode.dmSize);
 973    if (!NT_SUCCESS(Status))
 974    {
 975       SetLastNtError(Status);
 976       return DISP_CHANGE_BADPARAM;
 977    }
 978    if (DevMode.dmDriverExtra > 0)
 979    {
 980       DbgPrint("(%s:%i) WIN32K: %s lpDevMode->dmDriverExtra is IGNORED!\n", __FILE__, __LINE__, __FUNCTION__);
 981       DevMode.dmDriverExtra = 0;
 982    }
 983
 984    /* Copy the device name */
 985    if (lpszDeviceName != NULL)
 986    {
 987       Status = IntSafeCopyUnicodeString(&SafeDeviceName, lpszDeviceName);
 988       if (!NT_SUCCESS(Status))
 989       {
 990          SetLastNtError(Status);
 991          return DISP_CHANGE_BADPARAM;
 992       }
 993       pSafeDeviceName = &SafeDeviceName;
 994    }
 995
 996    /* Call internal function */
 997    Ret = IntChangeDisplaySettings(pSafeDeviceName, &DevMode, dwflags, lParam);
 998
 999    if (pSafeDeviceName != NULL)
1000       RtlFreeUnicodeString(pSafeDeviceName);
1001
1002    return Ret;
1003 }
1004
1005
1006 /* EOF */