git.oblomov.eu Git - wine/blob - windows/painting.c

   1 /*
   2  * Window painting functions
   3  *
   4  * Copyright 1993, 1994, 1995 Alexandre Julliard
   5  *                       1999 Alex Korobka
   6  */
   7
   8 #include "region.h"
   9 #include "win.h"
  10 #include "queue.h"
  11 #include "dce.h"
  12 #include "heap.h"
  13 #include "debugtools.h"
  14 #include "wine/winuser16.h"
  15
  16 DECLARE_DEBUG_CHANNEL(nonclient)
  17 DECLARE_DEBUG_CHANNEL(win)
  18
  19 /* client rect in window coordinates */
  20
  21 #define GETCLIENTRECTW( wnd, r )        (r).left = (wnd)->rectClient.left - (wnd)->rectWindow.left; \
  22                                         (r).top = (wnd)->rectClient.top - (wnd)->rectWindow.top; \
  23                                         (r).right = (wnd)->rectClient.right - (wnd)->rectWindow.left; \
  24                                         (r).bottom = (wnd)->rectClient.bottom - (wnd)->rectWindow.top
  25
  26   /* Last CTLCOLOR id */
  27 #define CTLCOLOR_MAX   CTLCOLOR_STATIC
  28
  29
  30 /***********************************************************************
  31  *           WIN_HaveToDelayNCPAINT
  32  *
  33  * Currently, in the Wine painting mechanism, the WM_NCPAINT message
  34  * is generated as soon as a region intersecting the non-client area
  35  * of a window is invalidated.
  36  *
  37  * This technique will work fine for all windows whose parents
  38  * have the WS_CLIPCHILDREN style. When the parents have that style,
  39  * they are not going to override the contents of their children.
  40  * However, when the parent doesn't have that style, Windows relies
  41  * on a "painter's algorithm" to display the contents of the windows.
  42  * That is, windows are painted from back to front. This includes the
  43  * non-client area.
  44  *
  45  * This method looks at the current state of a window to determine
  46  * if the sending of the WM_NCPAINT message should be delayed until
  47  * the BeginPaint call.
  48  *
  49  * PARAMS:
  50  *   wndPtr   - A Locked window pointer to the window we're
  51  *              examining.
  52  *   uncFlags - This is the flag passed to the WIN_UpdateNCRgn
  53  *              function. This is a shortcut for the cases when
  54  *              we already know when to avoid scanning all the
  55  *              parents of a window. If you already know that this
  56  *              window's NCPAINT should be delayed, set the
  57  *              UNC_DELAY_NCPAINT flag for this parameter.
  58  *
  59  *              This shortcut behavior is implemented in the
  60  *              RDW_Paint() method.
  61  *
  62  */
  63 static BOOL WIN_HaveToDelayNCPAINT(
  64   WND* wndPtr,
  65   UINT uncFlags)
  66 {
  67   WND* parentWnd = NULL;
  68
  69   /*
  70    * Test the shortcut first. (duh)
  71    */
  72   if (uncFlags & UNC_DELAY_NCPAINT)
  73     return TRUE;
  74
  75   /*
  76    * The UNC_IN_BEGINPAINT flag is set in the BeginPaint
  77    * method only. This is another shortcut to avoid going
  78    * up the parent's chain of the window to finally
  79    * figure-out that none of them has an invalid region.
  80    */
  81   if (uncFlags & UNC_IN_BEGINPAINT)
  82     return FALSE;
  83
  84   /*
  85    * Scan all the parents of this window to find a window
  86    * that doesn't have the WS_CLIPCHILDREN style and that
  87    * has an invalid region.
  88    */
  89   parentWnd = WIN_LockWndPtr(wndPtr->parent);
  90
  91   while (parentWnd!=NULL)
  92   {
  93     if ( ((parentWnd->dwStyle & WS_CLIPCHILDREN) == 0) &&
  94          (parentWnd->hrgnUpdate != 0) )
  95     {
  96       WIN_ReleaseWndPtr(parentWnd);
  97       return TRUE;
  98     }
  99
 100     WIN_UpdateWndPtr(&parentWnd, parentWnd->parent);
 101   }
 102
 103   WIN_ReleaseWndPtr(parentWnd);
 104
 105   return FALSE;
 106 }
 107
 108 /***********************************************************************
 109  *           WIN_UpdateNCRgn
 110  *
 111  *  Things to do:
 112  *      Send WM_NCPAINT if required (when nonclient is invalid or UNC_ENTIRE flag is set)
 113  *      Crop hrgnUpdate to a client rect, especially if it 1.
 114  *      If UNC_REGION is set return update region for the client rect.
 115  *
 116  *  NOTE: UNC_REGION is mainly for the RDW_Paint() chunk that sends WM_ERASEBKGND message.
 117  *        The trick is that when the returned region handle may be different from hRgn.
 118  *        In this case the old hRgn must be considered gone. BUT, if the returned value
 119  *        is 1 then the hRgn is preserved and RDW_Paint() will have to get
 120  *        a DC without extra clipping region.
 121  */
 122 HRGN WIN_UpdateNCRgn(WND* wnd, HRGN hRgn, UINT uncFlags )
 123 {
 124     RECT  r;
 125     HRGN  hClip = 0;
 126     HRGN  hrgnRet = 0;
 127
 128     TRACE_(nonclient)("hwnd %04x [%04x] hrgn %04x, unc %04x, ncf %i\n",
 129                       wnd->hwndSelf, wnd->hrgnUpdate, hRgn, uncFlags, wnd->flags & WIN_NEEDS_NCPAINT);
 130
 131     /* desktop window doesn't have a nonclient area */
 132     if(wnd == WIN_GetDesktop())
 133     {
 134         wnd->flags &= ~WIN_NEEDS_NCPAINT;
 135         if( wnd->hrgnUpdate > 1 )
 136             hrgnRet = REGION_CropRgn( hRgn, wnd->hrgnUpdate, NULL, NULL );
 137         else
 138         {
 139             hrgnRet = wnd->hrgnUpdate;
 140         }
 141         WIN_ReleaseDesktop();
 142         return hrgnRet;
 143     }
 144     WIN_ReleaseDesktop();
 145
 146     if ((wnd->hwndSelf == GetForegroundWindow()) &&
 147         !(wnd->flags & WIN_NCACTIVATED) )
 148     {
 149         wnd->flags |= WIN_NCACTIVATED;
 150         uncFlags |= UNC_ENTIRE;
 151     }
 152
 153     /*
 154      * If the window's non-client area needs to be painted,
 155      */
 156     if ( ( wnd->flags & WIN_NEEDS_NCPAINT ) &&
 157          !WIN_HaveToDelayNCPAINT(wnd, uncFlags) )
 158     {
 159             RECT r2, r3;
 160
 161             wnd->flags &= ~WIN_NEEDS_NCPAINT;
 162             GETCLIENTRECTW( wnd, r );
 163
 164             TRACE_(nonclient)( "\tclient box (%i,%i-%i,%i), hrgnUpdate %04x\n",
 165                                 r.left, r.top, r.right, r.bottom, wnd->hrgnUpdate );
 166             if( wnd->hrgnUpdate > 1 )
 167             {
 168                 /* Check if update rgn overlaps with nonclient area */
 169
 170                 GetRgnBox( wnd->hrgnUpdate, &r2 );
 171                 UnionRect( &r3, &r2, &r );
 172                 if( r3.left != r.left || r3.top != r.top ||
 173                     r3.right != r.right || r3.bottom != r.bottom ) /* it does */
 174                 {
 175                     /* crop hrgnUpdate, save old one in hClip - the only
 176                      * case that places a valid region handle in hClip */
 177
 178                     hClip = wnd->hrgnUpdate;
 179                     wnd->hrgnUpdate = REGION_CropRgn( hRgn, hClip, &r, NULL );
 180                     if( uncFlags & UNC_REGION ) hrgnRet = hClip;
 181                 }
 182
 183                 if( uncFlags & UNC_CHECK )
 184                 {
 185                     GetRgnBox( wnd->hrgnUpdate, &r3 );
 186                     if( IsRectEmpty( &r3 ) )
 187                     {
 188                         /* delete the update region since all invalid
 189                          * parts were in the nonclient area */
 190
 191                         DeleteObject( wnd->hrgnUpdate );
 192                         wnd->hrgnUpdate = 0;
 193                         if(!(wnd->flags & WIN_INTERNAL_PAINT))
 194                             QUEUE_DecPaintCount( wnd->hmemTaskQ );
 195
 196                         wnd->flags &= ~WIN_NEEDS_ERASEBKGND;
 197                     }
 198                 }
 199
 200                 if(!hClip && wnd->hrgnUpdate ) goto copyrgn;
 201             }
 202             else
 203             if( wnd->hrgnUpdate == 1 )/* entire window */
 204             {
 205                 if( uncFlags & UNC_UPDATE ) wnd->hrgnUpdate = CreateRectRgnIndirect( &r );
 206                 if( uncFlags & UNC_REGION ) hrgnRet = 1;
 207                 uncFlags |= UNC_ENTIRE;
 208             }
 209     }
 210     else /* no WM_NCPAINT unless forced */
 211     {
 212         if( wnd->hrgnUpdate >  1 )
 213         {
 214 copyrgn:
 215             if( uncFlags & UNC_REGION )
 216                 hrgnRet = REGION_CropRgn( hRgn, wnd->hrgnUpdate, NULL, NULL );
 217         }
 218         else
 219         if( wnd->hrgnUpdate == 1 && (uncFlags & UNC_UPDATE) )
 220         {
 221             GETCLIENTRECTW( wnd, r );
 222             wnd->hrgnUpdate = CreateRectRgnIndirect( &r );
 223             if( uncFlags & UNC_REGION ) hrgnRet = 1;
 224         }
 225     }
 226
 227     if(!hClip && (uncFlags & UNC_ENTIRE) )
 228     {
 229         /* still don't do anything if there is no nonclient area */
 230         hClip = (memcmp( &wnd->rectWindow, &wnd->rectClient, sizeof(RECT) ) != 0);
 231     }
 232
 233     if( hClip ) /* NOTE: WM_NCPAINT allows wParam to be 1 */
 234     {
 235         if ( hClip == hrgnRet && hrgnRet > 1 ) {
 236             hClip = CreateRectRgn( 0, 0, 0, 0 );
 237             CombineRgn( hClip, hrgnRet, 0, RGN_COPY );
 238         }
 239
 240         SendMessageA( wnd->hwndSelf, WM_NCPAINT, hClip, 0L );
 241         if( (hClip > 1) && (hClip != hRgn) && (hClip != hrgnRet) )
 242             DeleteObject( hClip );
 243         /*
 244          * Since all Window locks are suspended while processing the WM_NCPAINT
 245          * we want to make sure the window still exists before continuing.
 246          */
 247         if (!IsWindow(wnd->hwndSelf))
 248         {
 249           DeleteObject(hrgnRet);
 250           hrgnRet=0;
 251         }
 252     }
 253
 254     TRACE_(nonclient)("returning %04x (hClip = %04x, hrgnUpdate = %04x)\n", hrgnRet, hClip, wnd->hrgnUpdate );
 255
 256     return hrgnRet;
 257 }
 258
 259
 260 /***********************************************************************
 261  *           BeginPaint16    (USER.39)
 262  */
 263 HDC16 WINAPI BeginPaint16( HWND16 hwnd, LPPAINTSTRUCT16 lps )
 264 {
 265     BOOL bIcon;
 266     HRGN hrgnUpdate;
 267     WND *wndPtr = WIN_FindWndPtr( hwnd );
 268     if (!wndPtr) return 0;
 269
 270     bIcon = (wndPtr->dwStyle & WS_MINIMIZE && GetClassWord(wndPtr->hwndSelf, GCW_HICON));
 271
 272     wndPtr->flags &= ~WIN_NEEDS_BEGINPAINT;
 273
 274     /* send WM_NCPAINT and make sure hrgnUpdate is a valid rgn handle */
 275     WIN_UpdateNCRgn( wndPtr, 0, UNC_UPDATE | UNC_IN_BEGINPAINT);
 276
 277     /*
 278      * Make sure the window is still a window. All window locks are suspended
 279      * when the WM_NCPAINT is sent.
 280      */
 281     if (!IsWindow(wndPtr->hwndSelf))
 282     {
 283         WIN_ReleaseWndPtr(wndPtr);
 284         return 0;
 285     }
 286
 287     if( ((hrgnUpdate = wndPtr->hrgnUpdate) != 0) || (wndPtr->flags & WIN_INTERNAL_PAINT))
 288         QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 289
 290     wndPtr->hrgnUpdate = 0;
 291     wndPtr->flags &= ~WIN_INTERNAL_PAINT;
 292
 293     HideCaret( hwnd );
 294
 295     TRACE_(win)("hrgnUpdate = %04x, \n", hrgnUpdate);
 296
 297     if (GetClassWord16(wndPtr->hwndSelf, GCW_STYLE) & CS_PARENTDC)
 298     {
 299         /* Don't clip the output to the update region for CS_PARENTDC window */
 300         if( hrgnUpdate )
 301             DeleteObject(hrgnUpdate);
 302         lps->hdc = GetDCEx16( hwnd, 0, DCX_WINDOWPAINT | DCX_USESTYLE |
 303                               (bIcon ? DCX_WINDOW : 0) );
 304     }
 305     else
 306     {
 307         if( hrgnUpdate ) /* convert to client coordinates */
 308             OffsetRgn( hrgnUpdate, wndPtr->rectWindow.left - wndPtr->rectClient.left,
 309                                    wndPtr->rectWindow.top - wndPtr->rectClient.top );
 310         lps->hdc = GetDCEx16(hwnd, hrgnUpdate, DCX_INTERSECTRGN |
 311                              DCX_WINDOWPAINT | DCX_USESTYLE | (bIcon ? DCX_WINDOW : 0) );
 312         /* ReleaseDC() in EndPaint() will delete the region */
 313     }
 314
 315     TRACE_(win)("hdc = %04x\n", lps->hdc);
 316
 317     if (!lps->hdc)
 318     {
 319         WARN_(win)("GetDCEx() failed in BeginPaint(), hwnd=%04x\n", hwnd);
 320         WIN_ReleaseWndPtr(wndPtr);
 321         return 0;
 322     }
 323
 324     GetClipBox16( lps->hdc, &lps->rcPaint );
 325
 326     TRACE_(win)("box = (%i,%i - %i,%i)\n", lps->rcPaint.left, lps->rcPaint.top,
 327                     lps->rcPaint.right, lps->rcPaint.bottom );
 328
 329     if (wndPtr->flags & WIN_NEEDS_ERASEBKGND)
 330     {
 331         wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 332         lps->fErase = !SendMessage16(hwnd, (bIcon) ? WM_ICONERASEBKGND
 333                                                    : WM_ERASEBKGND,
 334                                      (WPARAM16)lps->hdc, 0 );
 335     }
 336     else lps->fErase = TRUE;
 337
 338     WIN_ReleaseWndPtr(wndPtr);
 339     return lps->hdc;
 340 }
 341
 342
 343 /***********************************************************************
 344  *           BeginPaint32    (USER32.10)
 345  */
 346 HDC WINAPI BeginPaint( HWND hwnd, PAINTSTRUCT *lps )
 347 {
 348     PAINTSTRUCT16 ps;
 349
 350     BeginPaint16( hwnd, &ps );
 351     lps->hdc            = (HDC)ps.hdc;
 352     lps->fErase         = ps.fErase;
 353     lps->rcPaint.top    = ps.rcPaint.top;
 354     lps->rcPaint.left   = ps.rcPaint.left;
 355     lps->rcPaint.right  = ps.rcPaint.right;
 356     lps->rcPaint.bottom = ps.rcPaint.bottom;
 357     lps->fRestore       = ps.fRestore;
 358     lps->fIncUpdate     = ps.fIncUpdate;
 359     return lps->hdc;
 360 }
 361
 362
 363 /***********************************************************************
 364  *           EndPaint16    (USER.40)
 365  */
 366 BOOL16 WINAPI EndPaint16( HWND16 hwnd, const PAINTSTRUCT16* lps )
 367 {
 368     ReleaseDC16( hwnd, lps->hdc );
 369     ShowCaret( hwnd );
 370     return TRUE;
 371 }
 372
 373
 374 /***********************************************************************
 375  *           EndPaint32    (USER32.176)
 376  */
 377 BOOL WINAPI EndPaint( HWND hwnd, const PAINTSTRUCT *lps )
 378 {
 379     ReleaseDC( hwnd, lps->hdc );
 380     ShowCaret( hwnd );
 381     return TRUE;
 382 }
 383
 384
 385 /***********************************************************************
 386  *           FillWindow    (USER.324)
 387  */
 388 void WINAPI FillWindow16( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc, HBRUSH16 hbrush )
 389 {
 390     RECT16 rect;
 391     GetClientRect16( hwnd, &rect );
 392     DPtoLP16( hdc, (LPPOINT16)&rect, 2 );
 393     PaintRect16( hwndParent, hwnd, hdc, hbrush, &rect );
 394 }
 395
 396
 397 /***********************************************************************
 398  *           PAINT_GetControlBrush
 399  */
 400 static HBRUSH16 PAINT_GetControlBrush( HWND hParent, HWND hWnd, HDC16 hDC, UINT16 ctlType )
 401 {
 402     HBRUSH16 bkgBrush = (HBRUSH16)SendMessageA( hParent, WM_CTLCOLORMSGBOX + ctlType,
 403                                                              (WPARAM)hDC, (LPARAM)hWnd );
 404     if( !IsGDIObject16(bkgBrush) )
 405         bkgBrush = DEFWND_ControlColor( hDC, ctlType );
 406     return bkgBrush;
 407 }
 408
 409
 410 /***********************************************************************
 411  *           PaintRect    (USER.325)
 412  */
 413 void WINAPI PaintRect16( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc,
 414                        HBRUSH16 hbrush, const RECT16 *rect)
 415 {
 416     if( hbrush <= CTLCOLOR_MAX )
 417     {
 418         if( hwndParent )
 419             hbrush = PAINT_GetControlBrush( hwndParent, hwnd, hdc, (UINT16)hbrush );
 420         else
 421             return;
 422     }
 423     if( hbrush )
 424         FillRect16( hdc, rect, hbrush );
 425 }
 426
 427
 428 /***********************************************************************
 429  *           GetControlBrush    (USER.326)
 430  */
 431 HBRUSH16 WINAPI GetControlBrush16( HWND16 hwnd, HDC16 hdc, UINT16 ctlType )
 432 {
 433     WND* wndPtr = WIN_FindWndPtr( hwnd );
 434     HBRUSH16 retvalue;
 435
 436     if((ctlType <= CTLCOLOR_MAX) && wndPtr )
 437     {
 438         WND* parent;
 439         if( wndPtr->dwStyle & WS_POPUP ) parent = WIN_LockWndPtr(wndPtr->owner);
 440         else parent = WIN_LockWndPtr(wndPtr->parent);
 441         if( !parent ) parent = wndPtr;
 442         retvalue = (HBRUSH16)PAINT_GetControlBrush( parent->hwndSelf, hwnd, hdc, ctlType );
 443         WIN_ReleaseWndPtr(parent);
 444         goto END;
 445     }
 446     retvalue = (HBRUSH16)0;
 447 END:
 448     WIN_ReleaseWndPtr(wndPtr);
 449     return retvalue;
 450 }
 451
 452
 453 /***********************************************************************
 454  *              RDW_ValidateParent [RDW_UpdateRgns() helper]
 455  *
 456  *  Validate the portions of parent that are covered by a validated child
 457  *  wndPtr = child
 458  */
 459 void  RDW_ValidateParent(WND *wndChild)
 460 {
 461     WND *wndParent = WIN_LockWndPtr(wndChild->parent);
 462     WND *wndDesktop = WIN_GetDesktop();
 463
 464     if ((wndParent) && (wndParent != wndDesktop) && !(wndParent->dwStyle & WS_CLIPCHILDREN))
 465     {
 466         HRGN hrg;
 467         if (wndChild->hrgnUpdate == 1 )
 468         {
 469             RECT r;
 470
 471             r.left = 0;
 472             r.top = 0;
 473             r.right = wndChild->rectWindow.right - wndChild->rectWindow.left;
 474             r.bottom = wndChild->rectWindow.bottom - wndChild->rectWindow.top;
 475
 476             hrg = CreateRectRgnIndirect( &r );
 477         }
 478         else
 479            hrg = wndChild->hrgnUpdate;
 480         if (wndParent->hrgnUpdate != 0)
 481         {
 482             POINT ptOffset;
 483             RECT rect, rectParent;
 484             if( wndParent->hrgnUpdate == 1 )
 485             {
 486                RECT r;
 487
 488                r.left = 0;
 489                r.top = 0;
 490                r.right = wndParent->rectWindow.right - wndParent->rectWindow.left;
 491                r.bottom = wndParent->rectWindow.bottom - wndParent->rectWindow.top;
 492
 493                wndParent->hrgnUpdate = CreateRectRgnIndirect( &r );
 494             }
 495             /* we must offset the child region by the offset of the child rect in the parent */
 496             GetWindowRect(wndParent->hwndSelf, &rectParent);
 497             GetWindowRect(wndChild->hwndSelf, &rect);
 498             ptOffset.x = rect.left - rectParent.left;
 499             ptOffset.y = rect.top - rectParent.top;
 500             OffsetRgn( hrg, ptOffset.x, ptOffset.y );
 501             CombineRgn( wndParent->hrgnUpdate, wndParent->hrgnUpdate, hrg, RGN_DIFF );
 502             OffsetRgn( hrg, -ptOffset.x, -ptOffset.y );
 503         }
 504         if (hrg != wndChild->hrgnUpdate) DeleteObject( hrg );
 505     }
 506     WIN_ReleaseWndPtr(wndParent);
 507     WIN_ReleaseDesktop();
 508 }
 509
 510 /***********************************************************************
 511  *              RDW_UpdateRgns [RedrawWindow() helper]
 512  *
 513  *  Walks the window tree and adds/removes parts of the hRgn to/from update
 514  *  regions of windows that overlap it. Also, manages internal paint flags.
 515  *
 516  *  NOTE: Walks the window tree so the caller must lock it.
 517  *        MUST preserve hRgn (can modify but then has to restore).
 518  */
 519 static void RDW_UpdateRgns( WND* wndPtr, HRGN hRgn, UINT flags, BOOL firstRecursLevel )
 520 {
 521     /*
 522      * Called only when one of the following is set:
 523      * (RDW_INVALIDATE | RDW_VALIDATE | RDW_INTERNALPAINT | RDW_NOINTERNALPAINT)
 524      */
 525
 526     BOOL bHadOne =  wndPtr->hrgnUpdate && hRgn;
 527     BOOL bChildren =  ( wndPtr->child && !(flags & RDW_NOCHILDREN) && !(wndPtr->dwStyle & WS_MINIMIZE)
 528                         && ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) );
 529     RECT r;
 530
 531     r.left = 0;
 532     r.top = 0;
 533     r.right = wndPtr->rectWindow.right - wndPtr->rectWindow.left;
 534     r.bottom = wndPtr->rectWindow.bottom - wndPtr->rectWindow.top;
 535
 536     TRACE_(win)("\thwnd %04x [%04x] -> hrgn [%04x], flags [%04x]\n", wndPtr->hwndSelf, wndPtr->hrgnUpdate, hRgn, flags );
 537
 538     if( flags & RDW_INVALIDATE )
 539     {
 540         if( hRgn > 1 )
 541         {
 542             switch( wndPtr->hrgnUpdate )
 543             {
 544                 default:
 545                         CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate, hRgn, RGN_OR );
 546                         /* fall through */
 547                 case 0:
 548                         wndPtr->hrgnUpdate = REGION_CropRgn( wndPtr->hrgnUpdate,
 549                                                              wndPtr->hrgnUpdate ? wndPtr->hrgnUpdate : hRgn,
 550                                                              &r, NULL );
 551                         if( !bHadOne )
 552                         {
 553                             GetRgnBox( wndPtr->hrgnUpdate, &r );
 554                             if( IsRectEmpty( &r ) )
 555                             {
 556                                 DeleteObject( wndPtr->hrgnUpdate );
 557                                 wndPtr->hrgnUpdate = 0;
 558                                 goto OUT;
 559                             }
 560                         }
 561                         break;
 562                 case 1: /* already an entire window */
 563                         break;
 564             }
 565         }
 566         else if( hRgn == 1 )
 567         {
 568             if( wndPtr->hrgnUpdate > 1 )
 569                 DeleteObject( wndPtr->hrgnUpdate );
 570             wndPtr->hrgnUpdate = 1;
 571         }
 572         else
 573             hRgn = wndPtr->hrgnUpdate;  /* this is a trick that depends on code in PAINT_RedrawWindow() */
 574
 575         if( !bHadOne && !(wndPtr->flags & WIN_INTERNAL_PAINT) )
 576             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 577
 578         if (flags & RDW_FRAME) wndPtr->flags |= WIN_NEEDS_NCPAINT;
 579         if (flags & RDW_ERASE) wndPtr->flags |= WIN_NEEDS_ERASEBKGND;
 580         flags    |= RDW_FRAME;
 581     }
 582     else if( flags & RDW_VALIDATE )
 583     {
 584         if( wndPtr->hrgnUpdate )
 585         {
 586             if( hRgn > 1 )
 587             {
 588                 if( wndPtr->hrgnUpdate == 1 )
 589                     wndPtr->hrgnUpdate = CreateRectRgnIndirect( &r );
 590
 591                 if( CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate, hRgn, RGN_DIFF )
 592                     == NULLREGION )
 593                     goto EMPTY;
 594             }
 595             else /* validate everything */
 596             {
 597                 if( wndPtr->hrgnUpdate > 1 )
 598                 {
 599 EMPTY:
 600                     DeleteObject( wndPtr->hrgnUpdate );
 601                 }
 602                 wndPtr->hrgnUpdate = 0;
 603             }
 604
 605             if( !wndPtr->hrgnUpdate )
 606             {
 607                 wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 608                 if( !(wndPtr->flags & WIN_INTERNAL_PAINT) )
 609                     QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 610             }
 611         }
 612
 613         if (flags & RDW_NOFRAME) wndPtr->flags &= ~WIN_NEEDS_NCPAINT;
 614         if (flags & RDW_NOERASE) wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 615
 616     }
 617
 618     if ((firstRecursLevel) && (wndPtr->hrgnUpdate != 0) && (flags & RDW_UPDATENOW))
 619         RDW_ValidateParent(wndPtr); /* validate parent covered by region */
 620
 621     /* in/validate child windows that intersect with the region if it
 622      * is a valid handle. */
 623
 624     if( flags & (RDW_INVALIDATE | RDW_VALIDATE) )
 625     {
 626         if( hRgn > 1 && bChildren )
 627         {
 628             WND* wnd = wndPtr->child;
 629             POINT ptTotal, prevOrigin = {0,0};
 630             POINT ptClient;
 631
 632             ptClient.x = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 633             ptClient.y = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 634
 635             for( ptTotal.x = ptTotal.y = 0; wnd; wnd = wnd->next )
 636             {
 637                 if( wnd->dwStyle & WS_VISIBLE )
 638                 {
 639                     POINT ptOffset;
 640
 641                     r.left = wnd->rectWindow.left + ptClient.x;
 642                     r.right = wnd->rectWindow.right + ptClient.x;
 643                     r.top = wnd->rectWindow.top + ptClient.y;
 644                     r.bottom = wnd->rectWindow.bottom + ptClient.y;
 645
 646                     ptOffset.x = r.left - prevOrigin.x;
 647                     ptOffset.y = r.top - prevOrigin.y;
 648                     OffsetRect( &r, -ptTotal.x, -ptTotal.y );
 649
 650                     if( RectInRegion( hRgn, &r ) )
 651                     {
 652                         OffsetRgn( hRgn, -ptOffset.x, -ptOffset.y );
 653                         RDW_UpdateRgns( wnd, hRgn, flags, FALSE );
 654                         prevOrigin.x = r.left + ptTotal.x;
 655                         prevOrigin.y = r.top + ptTotal.y;
 656                         ptTotal.x += ptOffset.x;
 657                         ptTotal.y += ptOffset.y;
 658                     }
 659                 }
 660             }
 661             OffsetRgn( hRgn, ptTotal.x, ptTotal.y );
 662             bChildren = 0;
 663         }
 664     }
 665
 666     /* handle hRgn == 1 (alias for entire window) and/or internal paint recursion */
 667
 668     if( bChildren )
 669     {
 670         WND* wnd;
 671         for( wnd = wndPtr->child; wnd; wnd = wnd->next )
 672              if( wnd->dwStyle & WS_VISIBLE )
 673                  RDW_UpdateRgns( wnd, hRgn, flags, FALSE );
 674     }
 675
 676 OUT:
 677
 678     /* Set/clear internal paint flag */
 679
 680     if (flags & RDW_INTERNALPAINT)
 681     {
 682         if ( !wndPtr->hrgnUpdate && !(wndPtr->flags & WIN_INTERNAL_PAINT))
 683             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 684         wndPtr->flags |= WIN_INTERNAL_PAINT;
 685     }
 686     else if (flags & RDW_NOINTERNALPAINT)
 687     {
 688         if ( !wndPtr->hrgnUpdate && (wndPtr->flags & WIN_INTERNAL_PAINT))
 689             QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 690         wndPtr->flags &= ~WIN_INTERNAL_PAINT;
 691     }
 692 }
 693
 694 /***********************************************************************
 695  *           RDW_Paint [RedrawWindow() helper]
 696  *
 697  * Walks the window tree and paints/erases windows that have
 698  * nonzero update regions according to redraw flags. hrgn is a scratch
 699  * region passed down during recursion. Must not be 1.
 700  *
 701  */
 702 static HRGN RDW_Paint( WND* wndPtr, HRGN hrgn, UINT flags, UINT ex )
 703 {
 704 /* NOTE: wndPtr is locked by caller.
 705  *
 706  * FIXME: Windows uses WM_SYNCPAINT to cut down the number of intertask
 707  * SendMessage() calls. This is a comment inside DefWindowProc() source
 708  * from 16-bit SDK:
 709  *
 710  *   This message avoids lots of inter-app message traffic
 711  *   by switching to the other task and continuing the
 712  *   recursion there.
 713  *
 714  * wParam         = flags
 715  * LOWORD(lParam) = hrgnClip
 716  * HIWORD(lParam) = hwndSkip  (not used; always NULL)
 717  *
 718  */
 719     HDC  hDC;
 720     HWND hWnd = wndPtr->hwndSelf;
 721     BOOL bIcon = ((wndPtr->dwStyle & WS_MINIMIZE) && GetClassWord(wndPtr->hwndSelf, GCW_HICON));
 722
 723       /* Erase/update the window itself ... */
 724
 725     TRACE_(win)("\thwnd %04x [%04x] -> hrgn [%04x], flags [%04x]\n", hWnd, wndPtr->hrgnUpdate, hrgn, flags );
 726
 727     /*
 728      * Check if this window should delay it's processing of WM_NCPAINT.
 729      * See WIN_HaveToDelayNCPAINT for a description of the mechanism
 730      */
 731     if ((ex & RDW_EX_DELAY_NCPAINT) || WIN_HaveToDelayNCPAINT(wndPtr, 0) )
 732         ex |= RDW_EX_DELAY_NCPAINT;
 733
 734     if (flags & RDW_UPDATENOW)
 735     {
 736         if (wndPtr->hrgnUpdate) /* wm_painticon wparam is 1 */
 737             SendMessage16( hWnd, (bIcon) ? WM_PAINTICON : WM_PAINT, bIcon, 0 );
 738     }
 739     else if ((flags & RDW_ERASENOW) || (ex & RDW_EX_TOPFRAME))
 740     {
 741         UINT dcx = DCX_INTERSECTRGN | DCX_USESTYLE | DCX_KEEPCLIPRGN | DCX_WINDOWPAINT | DCX_CACHE;
 742         HRGN hrgnRet;
 743
 744         hrgnRet = WIN_UpdateNCRgn(wndPtr,
 745                                   hrgn,
 746                                   UNC_REGION | UNC_CHECK |
 747                                   ((ex & RDW_EX_TOPFRAME) ? UNC_ENTIRE : 0) |
 748                                   ((ex & RDW_EX_DELAY_NCPAINT) ? UNC_DELAY_NCPAINT : 0) );
 749
 750         if( hrgnRet )
 751         {
 752             if( hrgnRet > 1 ) hrgn = hrgnRet; else hrgnRet = 0; /* entire client */
 753             if( wndPtr->flags & WIN_NEEDS_ERASEBKGND )
 754             {
 755                 if( bIcon ) dcx |= DCX_WINDOW;
 756                 else
 757                 if( hrgnRet )
 758                     OffsetRgn( hrgnRet, wndPtr->rectWindow.left - wndPtr->rectClient.left,
 759                                         wndPtr->rectWindow.top  - wndPtr->rectClient.top);
 760                 else
 761                     dcx &= ~DCX_INTERSECTRGN;
 762                 if (( hDC = GetDCEx( hWnd, hrgnRet, dcx )) )
 763                 {
 764                     if (SendMessage16( hWnd, (bIcon) ? WM_ICONERASEBKGND
 765                                        : WM_ERASEBKGND, (WPARAM16)hDC, 0 ))
 766                     wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 767                     ReleaseDC( hWnd, hDC );
 768                 }
 769             }
 770         }
 771     }
 772
 773     if( !IsWindow(hWnd) ) return hrgn;
 774     ex &= ~RDW_EX_TOPFRAME;
 775
 776       /* ... and its child windows */
 777
 778     if( wndPtr->child && !(flags & RDW_NOCHILDREN) && !(wndPtr->dwStyle & WS_MINIMIZE)
 779         && ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) )
 780     {
 781         WND** list, **ppWnd;
 782
 783         if( (list = WIN_BuildWinArray( wndPtr, 0, NULL )) )
 784         {
 785             wndPtr = NULL;
 786             for (ppWnd = list; *ppWnd; ppWnd++)
 787             {
 788                 WIN_UpdateWndPtr(&wndPtr,*ppWnd);
 789                 if (!IsWindow(wndPtr->hwndSelf)) continue;
 790                     if ( (wndPtr->dwStyle & WS_VISIBLE) &&
 791                          (wndPtr->hrgnUpdate || (wndPtr->flags & WIN_INTERNAL_PAINT)) )
 792                         hrgn = RDW_Paint( wndPtr, hrgn, flags, ex );
 793             }
 794             WIN_ReleaseWndPtr(wndPtr);
 795             WIN_ReleaseWinArray(list);
 796         }
 797     }
 798
 799     return hrgn;
 800 }
 801
 802 /***********************************************************************
 803  *           PAINT_RedrawWindow
 804  *
 805  */
 806 BOOL PAINT_RedrawWindow( HWND hwnd, const RECT *rectUpdate,
 807                            HRGN hrgnUpdate, UINT flags, UINT ex )
 808 {
 809     HRGN hRgn = 0;
 810     RECT r, r2;
 811     POINT pt;
 812     WND* wndPtr;
 813
 814     if (!hwnd) hwnd = GetDesktopWindow();
 815     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return FALSE;
 816
 817     /* check if the window or its parents are visible/not minimized */
 818
 819     if (!WIN_IsWindowDrawable( wndPtr, !(flags & RDW_FRAME) ) )
 820     {
 821         WIN_ReleaseWndPtr(wndPtr);
 822         return TRUE;
 823     }
 824
 825     if (TRACE_ON(win))
 826     {
 827         if( hrgnUpdate )
 828         {
 829             GetRgnBox( hrgnUpdate, &r );
 830             TRACE_(win)( "%04x (%04x) NULL %04x box (%i,%i-%i,%i) flags=%04x, exflags=%04x\n",
 831                   hwnd, wndPtr->hrgnUpdate, hrgnUpdate, r.left, r.top, r.right, r.bottom, flags, ex);
 832         }
 833         else
 834         {
 835             if( rectUpdate )
 836                 r = *rectUpdate;
 837             else
 838                 SetRectEmpty( &r );
 839             TRACE_(win)( "%04x (%04x) %s %d,%d-%d,%d %04x flags=%04x, exflags=%04x\n",
 840                         hwnd, wndPtr->hrgnUpdate, rectUpdate ? "rect" : "NULL", r.left,
 841                         r.top, r.right, r.bottom, hrgnUpdate, flags, ex );
 842         }
 843     }
 844
 845     /* prepare an update region in window coordinates */
 846
 847     if( flags & RDW_FRAME )
 848         r = wndPtr->rectWindow;
 849     else
 850         r = wndPtr->rectClient;
 851
 852     if( ex & RDW_EX_XYWINDOW )
 853     {
 854         pt.x = pt.y = 0;
 855         OffsetRect( &r, -wndPtr->rectWindow.left, -wndPtr->rectWindow.top );
 856     }
 857     else
 858     {
 859         pt.x = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 860         pt.y = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 861         OffsetRect( &r, -wndPtr->rectClient.left, -wndPtr->rectClient.top );
 862     }
 863
 864     if (flags & RDW_INVALIDATE)  /* ------------------------- Invalidate */
 865     {
 866         /* If the window doesn't have hrgnUpdate we leave hRgn zero
 867          * and put a new region straight into wndPtr->hrgnUpdate
 868          * so that RDW_UpdateRgns() won't have to do any extra work.
 869          */
 870
 871         if( hrgnUpdate )
 872         {
 873             if( wndPtr->hrgnUpdate )
 874                 hRgn = REGION_CropRgn( 0, hrgnUpdate, NULL, &pt );
 875             else
 876                 wndPtr->hrgnUpdate = REGION_CropRgn( 0, hrgnUpdate, &r, &pt );
 877         }
 878         else if( rectUpdate )
 879         {
 880             if( !IntersectRect( &r2, &r, rectUpdate ) ) goto END;
 881             OffsetRect( &r2, pt.x, pt.y );
 882
 883 rect2i:
 884             if( wndPtr->hrgnUpdate == 0 )
 885                 wndPtr->hrgnUpdate = CreateRectRgnIndirect( &r2 );
 886             else
 887                 hRgn = CreateRectRgnIndirect( &r2 );
 888         }
 889         else /* entire window or client depending on RDW_FRAME */
 890         {
 891             if( flags & RDW_FRAME )
 892             {
 893                 if( wndPtr->hrgnUpdate )
 894                     DeleteObject( wndPtr->hrgnUpdate );
 895                 wndPtr->hrgnUpdate = 1;
 896             }
 897             else
 898             {
 899                 GETCLIENTRECTW( wndPtr, r2 );
 900                 goto rect2i;
 901             }
 902         }
 903     }
 904     else if (flags & RDW_VALIDATE)  /* ------------------------- Validate */
 905     {
 906         /* In this we cannot leave with zero hRgn */
 907         if( hrgnUpdate )
 908         {
 909             hRgn = REGION_CropRgn( hRgn, hrgnUpdate,  &r, &pt );
 910             GetRgnBox( hRgn, &r2 );
 911             if( IsRectEmpty( &r2 ) ) goto END;
 912         }
 913         else if( rectUpdate )
 914         {
 915             if( !IntersectRect( &r2, &r, rectUpdate ) ) goto END;
 916                 OffsetRect( &r2, pt.x, pt.y );
 917 rect2v:
 918             hRgn = CreateRectRgnIndirect( &r2 );
 919         }
 920         else /* entire window or client depending on RDW_FRAME */
 921         {
 922             if( flags & RDW_FRAME )
 923                 hRgn = 1;
 924             else
 925             {
 926                 GETCLIENTRECTW( wndPtr, r2 );
 927                 goto rect2v;
 928             }
 929         }
 930     }
 931
 932     /* At this point hRgn is either an update region in window coordinates or 1 or 0 */
 933
 934     RDW_UpdateRgns( wndPtr, hRgn, flags, TRUE );
 935
 936     /* Erase/update windows, from now on hRgn is a scratch region */
 937
 938     hRgn = RDW_Paint( wndPtr, (hRgn == 1) ? 0 : hRgn, flags, ex );
 939
 940 END:
 941     if( hRgn > 1 && (hRgn != hrgnUpdate) )
 942         DeleteObject(hRgn );
 943     WIN_ReleaseWndPtr(wndPtr);
 944     return TRUE;
 945 }
 946
 947
 948 /***********************************************************************
 949  *           RedrawWindow32    (USER32.426)
 950  */
 951 BOOL WINAPI RedrawWindow( HWND hwnd, const RECT *rectUpdate,
 952                               HRGN hrgnUpdate, UINT flags )
 953 {
 954     return PAINT_RedrawWindow( hwnd, rectUpdate, hrgnUpdate, flags, 0 );
 955 }
 956
 957
 958 /***********************************************************************
 959  *           RedrawWindow16    (USER.290)
 960  */
 961 BOOL16 WINAPI RedrawWindow16( HWND16 hwnd, const RECT16 *rectUpdate,
 962                               HRGN16 hrgnUpdate, UINT16 flags )
 963 {
 964     if (rectUpdate)
 965     {
 966         RECT r;
 967         CONV_RECT16TO32( rectUpdate, &r );
 968         return (BOOL16)RedrawWindow( (HWND)hwnd, &r, hrgnUpdate, flags );
 969     }
 970     return (BOOL16)PAINT_RedrawWindow( (HWND)hwnd, NULL,
 971                                        (HRGN)hrgnUpdate, flags, 0 );
 972 }
 973
 974
 975 /***********************************************************************
 976  *           UpdateWindow16   (USER.124)
 977  */
 978 void WINAPI UpdateWindow16( HWND16 hwnd )
 979 {
 980     PAINT_RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN, 0 );
 981 }
 982
 983 /***********************************************************************
 984  *           UpdateWindow32   (USER32.567)
 985  */
 986 void WINAPI UpdateWindow( HWND hwnd )
 987 {
 988     PAINT_RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN, 0 );
 989 }
 990
 991 /***********************************************************************
 992  *           InvalidateRgn16   (USER.126)
 993  */
 994 void WINAPI InvalidateRgn16( HWND16 hwnd, HRGN16 hrgn, BOOL16 erase )
 995 {
 996     PAINT_RedrawWindow((HWND)hwnd, NULL, (HRGN)hrgn,
 997                        RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
 998 }
 999
1000
1001 /***********************************************************************
1002  *           InvalidateRgn32   (USER32.329)
1003  */
1004 BOOL WINAPI InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1005 {
1006     return PAINT_RedrawWindow(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
1007 }
1008
1009
1010 /***********************************************************************
1011  *           InvalidateRect16   (USER.125)
1012  */
1013 void WINAPI InvalidateRect16( HWND16 hwnd, const RECT16 *rect, BOOL16 erase )
1014 {
1015     RedrawWindow16( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
1016 }
1017
1018
1019 /***********************************************************************
1020  *           InvalidateRect32   (USER32.328)
1021  */
1022 BOOL WINAPI InvalidateRect( HWND hwnd, const RECT *rect, BOOL erase )
1023 {
1024     return PAINT_RedrawWindow( hwnd, rect, 0,
1025                                RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
1026 }
1027
1028
1029 /***********************************************************************
1030  *           ValidateRgn16   (USER.128)
1031  */
1032 void WINAPI ValidateRgn16( HWND16 hwnd, HRGN16 hrgn )
1033 {
1034     PAINT_RedrawWindow( (HWND)hwnd, NULL, (HRGN)hrgn,
1035                         RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1036 }
1037
1038
1039 /***********************************************************************
1040  *           ValidateRgn32   (USER32.572)
1041  */
1042 void WINAPI ValidateRgn( HWND hwnd, HRGN hrgn )
1043 {
1044     PAINT_RedrawWindow( hwnd, NULL, hrgn, RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1045 }
1046
1047
1048 /***********************************************************************
1049  *           ValidateRect16   (USER.127)
1050  */
1051 void WINAPI ValidateRect16( HWND16 hwnd, const RECT16 *rect )
1052 {
1053     RedrawWindow16( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN );
1054 }
1055
1056
1057 /***********************************************************************
1058  *           ValidateRect32   (USER32.571)
1059  */
1060 void WINAPI ValidateRect( HWND hwnd, const RECT *rect )
1061 {
1062     PAINT_RedrawWindow( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1063 }
1064
1065
1066 /***********************************************************************
1067  *           GetUpdateRect16   (USER.190)
1068  */
1069 BOOL16 WINAPI GetUpdateRect16( HWND16 hwnd, LPRECT16 rect, BOOL16 erase )
1070 {
1071     RECT r;
1072     BOOL16 ret;
1073
1074     if (!rect) return GetUpdateRect( hwnd, NULL, erase );
1075     ret = GetUpdateRect( hwnd, &r, erase );
1076     CONV_RECT32TO16( &r, rect );
1077     return ret;
1078 }
1079
1080
1081 /***********************************************************************
1082  *           GetUpdateRect32   (USER32.297)
1083  */
1084 BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
1085 {
1086     BOOL retvalue;
1087     WND * wndPtr = WIN_FindWndPtr( hwnd );
1088     if (!wndPtr) return FALSE;
1089
1090     if (rect)
1091     {
1092         if (wndPtr->hrgnUpdate > 1)
1093         {
1094             HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
1095             if (GetUpdateRgn( hwnd, hrgn, erase ) == ERROR)
1096             {
1097                 retvalue = FALSE;
1098                 goto END;
1099             }
1100             GetRgnBox( hrgn, rect );
1101             DeleteObject( hrgn );
1102             if (GetClassLongA(wndPtr->hwndSelf, GCL_STYLE) & CS_OWNDC)
1103             {
1104                 if (GetMapMode(wndPtr->dce->hDC) != MM_TEXT)
1105                 {
1106                     DPtoLP (wndPtr->dce->hDC, (LPPOINT)rect,  2);
1107                 }
1108             }
1109         }
1110         else
1111         if( wndPtr->hrgnUpdate == 1 )
1112         {
1113             GetClientRect( hwnd, rect );
1114             if (erase) RedrawWindow( hwnd, NULL, 0, RDW_FRAME | RDW_ERASENOW | RDW_NOCHILDREN );
1115         }
1116         else
1117             SetRectEmpty( rect );
1118     }
1119     retvalue = (wndPtr->hrgnUpdate >= 1);
1120 END:
1121     WIN_ReleaseWndPtr(wndPtr);
1122     return retvalue;
1123 }
1124
1125
1126 /***********************************************************************
1127  *           GetUpdateRgn16   (USER.237)
1128  */
1129 INT16 WINAPI GetUpdateRgn16( HWND16 hwnd, HRGN16 hrgn, BOOL16 erase )
1130 {
1131     return GetUpdateRgn( hwnd, hrgn, erase );
1132 }
1133
1134
1135 /***********************************************************************
1136  *           GetUpdateRgn    (USER32.298)
1137  */
1138 INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1139 {
1140     INT retval;
1141     WND * wndPtr = WIN_FindWndPtr( hwnd );
1142     if (!wndPtr) return ERROR;
1143
1144     if (wndPtr->hrgnUpdate == 0)
1145     {
1146         SetRectRgn( hrgn, 0, 0, 0, 0 );
1147         retval = NULLREGION;
1148         goto END;
1149     }
1150     else
1151     if (wndPtr->hrgnUpdate == 1)
1152     {
1153         SetRectRgn( hrgn, 0, 0, wndPtr->rectClient.right - wndPtr->rectClient.left,
1154                                 wndPtr->rectClient.bottom - wndPtr->rectClient.top );
1155         retval = SIMPLEREGION;
1156     }
1157     else
1158     {
1159         retval = CombineRgn( hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY );
1160         OffsetRgn( hrgn, wndPtr->rectWindow.left - wndPtr->rectClient.left,
1161                          wndPtr->rectWindow.top - wndPtr->rectClient.top );
1162     }
1163     if (erase) RedrawWindow( hwnd, NULL, 0, RDW_ERASENOW | RDW_NOCHILDREN );
1164 END:
1165     WIN_ReleaseWndPtr(wndPtr);
1166     return retval;
1167 }
1168
1169
1170 /***********************************************************************
1171  *           ExcludeUpdateRgn16   (USER.238)
1172  */
1173 INT16 WINAPI ExcludeUpdateRgn16( HDC16 hdc, HWND16 hwnd )
1174 {
1175     return ExcludeUpdateRgn( hdc, hwnd );
1176 }
1177
1178
1179 /***********************************************************************
1180  *           ExcludeUpdateRgn32   (USER32.195)
1181  */
1182 INT WINAPI ExcludeUpdateRgn( HDC hdc, HWND hwnd )
1183 {
1184     RECT rect;
1185     WND * wndPtr;
1186
1187     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return ERROR;
1188
1189     if (wndPtr->hrgnUpdate)
1190     {
1191         INT ret;
1192         HRGN hrgn = CreateRectRgn(wndPtr->rectWindow.left - wndPtr->rectClient.left,
1193                                       wndPtr->rectWindow.top - wndPtr->rectClient.top,
1194                                       wndPtr->rectWindow.right - wndPtr->rectClient.left,
1195                                       wndPtr->rectWindow.bottom - wndPtr->rectClient.top);
1196         if( wndPtr->hrgnUpdate > 1 )
1197         {
1198             CombineRgn(hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY);
1199             OffsetRgn(hrgn, wndPtr->rectWindow.left - wndPtr->rectClient.left,
1200                             wndPtr->rectWindow.top - wndPtr->rectClient.top );
1201         }
1202
1203         /* do ugly coordinate translations in dce.c */
1204
1205         ret = DCE_ExcludeRgn( hdc, wndPtr, hrgn );
1206         DeleteObject( hrgn );
1207         WIN_ReleaseWndPtr(wndPtr);
1208         return ret;
1209     }
1210     WIN_ReleaseWndPtr(wndPtr);
1211     return GetClipBox( hdc, &rect );
1212 }
1213
1214