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 = {0, 0, wndChild->rectWindow.right - wndChild->rectWindow.left,
 470                             wndChild->rectWindow.bottom - wndChild->rectWindow.top };
 471             hrg = CreateRectRgnIndirect( &r );
 472         }
 473         else
 474            hrg = wndChild->hrgnUpdate;
 475         if (wndParent->hrgnUpdate != 0)
 476         {
 477             POINT ptOffset;
 478             RECT rect, rectParent;
 479             if( wndParent->hrgnUpdate == 1 )
 480             {
 481                RECT r = {0, 0, wndParent->rectWindow.right - wndParent->rectWindow.left,
 482                             wndParent->rectWindow.bottom - wndParent->rectWindow.top };
 483                wndParent->hrgnUpdate = CreateRectRgnIndirect( &r );
 484             }
 485             /* we must offset the child region by the offset of the child rect in the parent */
 486             GetWindowRect(wndParent->hwndSelf, &rectParent);
 487             GetWindowRect(wndChild->hwndSelf, &rect);
 488             ptOffset.x = rect.left - rectParent.left;
 489             ptOffset.y = rect.top - rectParent.top;
 490             OffsetRgn( hrg, ptOffset.x, ptOffset.y );
 491             CombineRgn( wndParent->hrgnUpdate, wndParent->hrgnUpdate, hrg, RGN_DIFF );
 492             OffsetRgn( hrg, -ptOffset.x, -ptOffset.y );
 493         }
 494         if (hrg != wndChild->hrgnUpdate) DeleteObject( hrg );
 495     }
 496     WIN_ReleaseWndPtr(wndParent);
 497     WIN_ReleaseDesktop();
 498 }
 499
 500 /***********************************************************************
 501  *              RDW_UpdateRgns [RedrawWindow() helper]
 502  *
 503  *  Walks the window tree and adds/removes parts of the hRgn to/from update
 504  *  regions of windows that overlap it. Also, manages internal paint flags.
 505  *
 506  *  NOTE: Walks the window tree so the caller must lock it.
 507  *        MUST preserve hRgn (can modify but then has to restore).
 508  */
 509 static void RDW_UpdateRgns( WND* wndPtr, HRGN hRgn, UINT flags, BOOL firstRecursLevel )
 510 {
 511     /*
 512      * Called only when one of the following is set:
 513      * (RDW_INVALIDATE | RDW_VALIDATE | RDW_INTERNALPAINT | RDW_NOINTERNALPAINT)
 514      */
 515
 516     BOOL bHadOne =  wndPtr->hrgnUpdate && hRgn;
 517     BOOL bChildren =  ( wndPtr->child && !(flags & RDW_NOCHILDREN) && !(wndPtr->dwStyle & WS_MINIMIZE)
 518                         && ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) );
 519     RECT r;
 520
 521     r.left = 0;
 522     r.top = 0;
 523     r.right = wndPtr->rectWindow.right - wndPtr->rectWindow.left;
 524     r.bottom = wndPtr->rectWindow.bottom - wndPtr->rectWindow.top;
 525
 526     TRACE_(win)("\thwnd %04x [%04x] -> hrgn [%04x], flags [%04x]\n", wndPtr->hwndSelf, wndPtr->hrgnUpdate, hRgn, flags );
 527
 528     if( flags & RDW_INVALIDATE )
 529     {
 530         if( hRgn > 1 )
 531         {
 532             switch( wndPtr->hrgnUpdate )
 533             {
 534                 default:
 535                         CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate, hRgn, RGN_OR );
 536                         /* fall through */
 537                 case 0:
 538                         wndPtr->hrgnUpdate = REGION_CropRgn( wndPtr->hrgnUpdate,
 539                                                              wndPtr->hrgnUpdate ? wndPtr->hrgnUpdate : hRgn,
 540                                                              &r, NULL );
 541                         if( !bHadOne )
 542                         {
 543                             GetRgnBox( wndPtr->hrgnUpdate, &r );
 544                             if( IsRectEmpty( &r ) )
 545                             {
 546                                 DeleteObject( wndPtr->hrgnUpdate );
 547                                 wndPtr->hrgnUpdate = 0;
 548                                 goto OUT;
 549                             }
 550                         }
 551                         break;
 552                 case 1: /* already an entire window */
 553                         break;
 554             }
 555         }
 556         else if( hRgn == 1 )
 557         {
 558             if( wndPtr->hrgnUpdate > 1 )
 559                 DeleteObject( wndPtr->hrgnUpdate );
 560             wndPtr->hrgnUpdate = 1;
 561         }
 562         else
 563             hRgn = wndPtr->hrgnUpdate;  /* this is a trick that depends on code in PAINT_RedrawWindow() */
 564
 565         if( !bHadOne && !(wndPtr->flags & WIN_INTERNAL_PAINT) )
 566             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 567
 568         if (flags & RDW_FRAME) wndPtr->flags |= WIN_NEEDS_NCPAINT;
 569         if (flags & RDW_ERASE) wndPtr->flags |= WIN_NEEDS_ERASEBKGND;
 570         flags    |= RDW_FRAME;
 571     }
 572     else if( flags & RDW_VALIDATE )
 573     {
 574         if( wndPtr->hrgnUpdate )
 575         {
 576             if( hRgn > 1 )
 577             {
 578                 if( wndPtr->hrgnUpdate == 1 )
 579                     wndPtr->hrgnUpdate = CreateRectRgnIndirect( &r );
 580
 581                 if( CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate, hRgn, RGN_DIFF )
 582                     == NULLREGION )
 583                     goto EMPTY;
 584             }
 585             else /* validate everything */
 586             {
 587                 if( wndPtr->hrgnUpdate > 1 )
 588                 {
 589 EMPTY:
 590                     DeleteObject( wndPtr->hrgnUpdate );
 591                 }
 592                 wndPtr->hrgnUpdate = 0;
 593             }
 594
 595             if( !wndPtr->hrgnUpdate )
 596             {
 597                 wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 598                 if( !(wndPtr->flags & WIN_INTERNAL_PAINT) )
 599                     QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 600             }
 601         }
 602
 603         if (flags & RDW_NOFRAME) wndPtr->flags &= ~WIN_NEEDS_NCPAINT;
 604         if (flags & RDW_NOERASE) wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 605
 606     }
 607
 608     if ((firstRecursLevel) && (wndPtr->hrgnUpdate != 0) && (flags & RDW_UPDATENOW))
 609         RDW_ValidateParent(wndPtr); /* validate parent covered by region */
 610
 611     /* in/validate child windows that intersect with the region if it
 612      * is a valid handle. */
 613
 614     if( flags & (RDW_INVALIDATE | RDW_VALIDATE) )
 615     {
 616         if( hRgn > 1 && bChildren )
 617         {
 618             WND* wnd = wndPtr->child;
 619             POINT ptTotal, prevOrigin = {0,0};
 620             POINT ptClient;
 621
 622             ptClient.x = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 623             ptClient.y = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 624
 625             for( ptTotal.x = ptTotal.y = 0; wnd; wnd = wnd->next )
 626             {
 627                 if( wnd->dwStyle & WS_VISIBLE )
 628                 {
 629                     POINT ptOffset;
 630
 631                     r.left = wnd->rectWindow.left + ptClient.x;
 632                     r.right = wnd->rectWindow.right + ptClient.x;
 633                     r.top = wnd->rectWindow.top + ptClient.y;
 634                     r.bottom = wnd->rectWindow.bottom + ptClient.y;
 635
 636                     ptOffset.x = r.left - prevOrigin.x;
 637                     ptOffset.y = r.top - prevOrigin.y;
 638                     OffsetRect( &r, -ptTotal.x, -ptTotal.y );
 639
 640                     if( RectInRegion( hRgn, &r ) )
 641                     {
 642                         OffsetRgn( hRgn, -ptOffset.x, -ptOffset.y );
 643                         RDW_UpdateRgns( wnd, hRgn, flags, FALSE );
 644                         prevOrigin.x = r.left + ptTotal.x;
 645                         prevOrigin.y = r.top + ptTotal.y;
 646                         ptTotal.x += ptOffset.x;
 647                         ptTotal.y += ptOffset.y;
 648                     }
 649                 }
 650             }
 651             OffsetRgn( hRgn, ptTotal.x, ptTotal.y );
 652             bChildren = 0;
 653         }
 654     }
 655
 656     /* handle hRgn == 1 (alias for entire window) and/or internal paint recursion */
 657
 658     if( bChildren )
 659     {
 660         WND* wnd;
 661         for( wnd = wndPtr->child; wnd; wnd = wnd->next )
 662              if( wnd->dwStyle & WS_VISIBLE )
 663                  RDW_UpdateRgns( wnd, hRgn, flags, FALSE );
 664     }
 665
 666 OUT:
 667
 668     /* Set/clear internal paint flag */
 669
 670     if (flags & RDW_INTERNALPAINT)
 671     {
 672         if ( !wndPtr->hrgnUpdate && !(wndPtr->flags & WIN_INTERNAL_PAINT))
 673             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 674         wndPtr->flags |= WIN_INTERNAL_PAINT;
 675     }
 676     else if (flags & RDW_NOINTERNALPAINT)
 677     {
 678         if ( !wndPtr->hrgnUpdate && (wndPtr->flags & WIN_INTERNAL_PAINT))
 679             QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 680         wndPtr->flags &= ~WIN_INTERNAL_PAINT;
 681     }
 682 }
 683
 684 /***********************************************************************
 685  *           RDW_Paint [RedrawWindow() helper]
 686  *
 687  * Walks the window tree and paints/erases windows that have
 688  * nonzero update regions according to redraw flags. hrgn is a scratch
 689  * region passed down during recursion. Must not be 1.
 690  *
 691  */
 692 static HRGN RDW_Paint( WND* wndPtr, HRGN hrgn, UINT flags, UINT ex )
 693 {
 694 /* NOTE: wndPtr is locked by caller.
 695  *
 696  * FIXME: Windows uses WM_SYNCPAINT to cut down the number of intertask
 697  * SendMessage() calls. This is a comment inside DefWindowProc() source
 698  * from 16-bit SDK:
 699  *
 700  *   This message avoids lots of inter-app message traffic
 701  *   by switching to the other task and continuing the
 702  *   recursion there.
 703  *
 704  * wParam         = flags
 705  * LOWORD(lParam) = hrgnClip
 706  * HIWORD(lParam) = hwndSkip  (not used; always NULL)
 707  *
 708  */
 709     HDC  hDC;
 710     HWND hWnd = wndPtr->hwndSelf;
 711     BOOL bIcon = ((wndPtr->dwStyle & WS_MINIMIZE) && GetClassWord(wndPtr->hwndSelf, GCW_HICON));
 712
 713       /* Erase/update the window itself ... */
 714
 715     TRACE_(win)("\thwnd %04x [%04x] -> hrgn [%04x], flags [%04x]\n", hWnd, wndPtr->hrgnUpdate, hrgn, flags );
 716
 717     /*
 718      * Check if this window should delay it's processing of WM_NCPAINT.
 719      * See WIN_HaveToDelayNCPAINT for a description of the mechanism
 720      */
 721     if ((ex & RDW_EX_DELAY_NCPAINT) || WIN_HaveToDelayNCPAINT(wndPtr, 0) )
 722         ex |= RDW_EX_DELAY_NCPAINT;
 723
 724     if (flags & RDW_UPDATENOW)
 725     {
 726         if (wndPtr->hrgnUpdate) /* wm_painticon wparam is 1 */
 727             SendMessage16( hWnd, (bIcon) ? WM_PAINTICON : WM_PAINT, bIcon, 0 );
 728     }
 729     else if ((flags & RDW_ERASENOW) || (ex & RDW_EX_TOPFRAME))
 730     {
 731         UINT dcx = DCX_INTERSECTRGN | DCX_USESTYLE | DCX_KEEPCLIPRGN | DCX_WINDOWPAINT | DCX_CACHE;
 732         HRGN hrgnRet;
 733
 734         hrgnRet = WIN_UpdateNCRgn(wndPtr,
 735                                   hrgn,
 736                                   UNC_REGION | UNC_CHECK |
 737                                   ((ex & RDW_EX_TOPFRAME) ? UNC_ENTIRE : 0) |
 738                                   ((ex & RDW_EX_DELAY_NCPAINT) ? UNC_DELAY_NCPAINT : 0) );
 739
 740         if( hrgnRet )
 741         {
 742             if( hrgnRet > 1 ) hrgn = hrgnRet; else hrgnRet = 0; /* entire client */
 743             if( wndPtr->flags & WIN_NEEDS_ERASEBKGND )
 744             {
 745                 if( bIcon ) dcx |= DCX_WINDOW;
 746                 else
 747                 if( hrgnRet )
 748                     OffsetRgn( hrgnRet, wndPtr->rectWindow.left - wndPtr->rectClient.left,
 749                                         wndPtr->rectWindow.top  - wndPtr->rectClient.top);
 750                 else
 751                     dcx &= ~DCX_INTERSECTRGN;
 752                 if (( hDC = GetDCEx( hWnd, hrgnRet, dcx )) )
 753                 {
 754                     if (SendMessage16( hWnd, (bIcon) ? WM_ICONERASEBKGND
 755                                        : WM_ERASEBKGND, (WPARAM16)hDC, 0 ))
 756                     wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 757                     ReleaseDC( hWnd, hDC );
 758                 }
 759             }
 760         }
 761     }
 762
 763     if( !IsWindow(hWnd) ) return hrgn;
 764     ex &= ~RDW_EX_TOPFRAME;
 765
 766       /* ... and its child windows */
 767
 768     if( wndPtr->child && !(flags & RDW_NOCHILDREN) && !(wndPtr->dwStyle & WS_MINIMIZE)
 769         && ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) )
 770     {
 771         WND** list, **ppWnd;
 772
 773         if( (list = WIN_BuildWinArray( wndPtr, 0, NULL )) )
 774         {
 775             wndPtr = NULL;
 776             for (ppWnd = list; *ppWnd; ppWnd++)
 777             {
 778                 WIN_UpdateWndPtr(&wndPtr,*ppWnd);
 779                 if (!IsWindow(wndPtr->hwndSelf)) continue;
 780                     if ( (wndPtr->dwStyle & WS_VISIBLE) &&
 781                          (wndPtr->hrgnUpdate || (wndPtr->flags & WIN_INTERNAL_PAINT)) )
 782                         hrgn = RDW_Paint( wndPtr, hrgn, flags, ex );
 783             }
 784             WIN_ReleaseWndPtr(wndPtr);
 785             WIN_ReleaseWinArray(list);
 786         }
 787     }
 788
 789     return hrgn;
 790 }
 791
 792 /***********************************************************************
 793  *           PAINT_RedrawWindow
 794  *
 795  */
 796 BOOL PAINT_RedrawWindow( HWND hwnd, const RECT *rectUpdate,
 797                            HRGN hrgnUpdate, UINT flags, UINT ex )
 798 {
 799     HRGN hRgn = 0;
 800     RECT r, r2;
 801     POINT pt;
 802     WND* wndPtr;
 803
 804     if (!hwnd) hwnd = GetDesktopWindow();
 805     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return FALSE;
 806
 807     /* check if the window or its parents are visible/not minimized */
 808
 809     if (!WIN_IsWindowDrawable( wndPtr, !(flags & RDW_FRAME) ) )
 810     {
 811         WIN_ReleaseWndPtr(wndPtr);
 812         return TRUE;
 813     }
 814
 815     if (TRACE_ON(win))
 816     {
 817         if( hrgnUpdate )
 818         {
 819             GetRgnBox( hrgnUpdate, &r );
 820             TRACE_(win)( "%04x (%04x) NULL %04x box (%i,%i-%i,%i) flags=%04x, exflags=%04x\n",
 821                   hwnd, wndPtr->hrgnUpdate, hrgnUpdate, r.left, r.top, r.right, r.bottom, flags, ex);
 822         }
 823         else
 824         {
 825             if( rectUpdate )
 826                 r = *rectUpdate;
 827             else
 828                 SetRectEmpty( &r );
 829             TRACE_(win)( "%04x (%04x) %s %d,%d-%d,%d %04x flags=%04x, exflags=%04x\n",
 830                         hwnd, wndPtr->hrgnUpdate, rectUpdate ? "rect" : "NULL", r.left,
 831                         r.top, r.right, r.bottom, hrgnUpdate, flags, ex );
 832         }
 833     }
 834
 835     /* prepare an update region in window coordinates */
 836
 837     if( flags & RDW_FRAME )
 838         r = wndPtr->rectWindow;
 839     else
 840         r = wndPtr->rectClient;
 841
 842     if( ex & RDW_EX_XYWINDOW )
 843     {
 844         pt.x = pt.y = 0;
 845         OffsetRect( &r, -wndPtr->rectWindow.left, -wndPtr->rectWindow.top );
 846     }
 847     else
 848     {
 849         pt.x = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 850         pt.y = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 851         OffsetRect( &r, -wndPtr->rectClient.left, -wndPtr->rectClient.top );
 852     }
 853
 854     if (flags & RDW_INVALIDATE)  /* ------------------------- Invalidate */
 855     {
 856         /* If the window doesn't have hrgnUpdate we leave hRgn zero
 857          * and put a new region straight into wndPtr->hrgnUpdate
 858          * so that RDW_UpdateRgns() won't have to do any extra work.
 859          */
 860
 861         if( hrgnUpdate )
 862         {
 863             if( wndPtr->hrgnUpdate )
 864                 hRgn = REGION_CropRgn( 0, hrgnUpdate, NULL, &pt );
 865             else
 866                 wndPtr->hrgnUpdate = REGION_CropRgn( 0, hrgnUpdate, &r, &pt );
 867         }
 868         else if( rectUpdate )
 869         {
 870             if( !IntersectRect( &r2, &r, rectUpdate ) ) goto END;
 871             OffsetRect( &r2, pt.x, pt.y );
 872
 873 rect2i:
 874             if( wndPtr->hrgnUpdate == 0 )
 875                 wndPtr->hrgnUpdate = CreateRectRgnIndirect( &r2 );
 876             else
 877                 hRgn = CreateRectRgnIndirect( &r2 );
 878         }
 879         else /* entire window or client depending on RDW_FRAME */
 880         {
 881             if( flags & RDW_FRAME )
 882             {
 883                 if( wndPtr->hrgnUpdate )
 884                     DeleteObject( wndPtr->hrgnUpdate );
 885                 wndPtr->hrgnUpdate = 1;
 886             }
 887             else
 888             {
 889                 GETCLIENTRECTW( wndPtr, r2 );
 890                 goto rect2i;
 891             }
 892         }
 893     }
 894     else if (flags & RDW_VALIDATE)  /* ------------------------- Validate */
 895     {
 896         /* In this we cannot leave with zero hRgn */
 897         if( hrgnUpdate )
 898         {
 899             hRgn = REGION_CropRgn( hRgn, hrgnUpdate,  &r, &pt );
 900             GetRgnBox( hRgn, &r2 );
 901             if( IsRectEmpty( &r2 ) ) goto END;
 902         }
 903         else if( rectUpdate )
 904         {
 905             if( !IntersectRect( &r2, &r, rectUpdate ) ) goto END;
 906                 OffsetRect( &r2, pt.x, pt.y );
 907 rect2v:
 908             hRgn = CreateRectRgnIndirect( &r2 );
 909         }
 910         else /* entire window or client depending on RDW_FRAME */
 911         {
 912             if( flags & RDW_FRAME )
 913                 hRgn = 1;
 914             else
 915             {
 916                 GETCLIENTRECTW( wndPtr, r2 );
 917                 goto rect2v;
 918             }
 919         }
 920     }
 921
 922     /* At this point hRgn is either an update region in window coordinates or 1 or 0 */
 923
 924     RDW_UpdateRgns( wndPtr, hRgn, flags, TRUE );
 925
 926     /* Erase/update windows, from now on hRgn is a scratch region */
 927
 928     hRgn = RDW_Paint( wndPtr, (hRgn == 1) ? 0 : hRgn, flags, ex );
 929
 930 END:
 931     if( hRgn > 1 && (hRgn != hrgnUpdate) )
 932         DeleteObject(hRgn );
 933     WIN_ReleaseWndPtr(wndPtr);
 934     return TRUE;
 935 }
 936
 937
 938 /***********************************************************************
 939  *           RedrawWindow32    (USER32.426)
 940  */
 941 BOOL WINAPI RedrawWindow( HWND hwnd, const RECT *rectUpdate,
 942                               HRGN hrgnUpdate, UINT flags )
 943 {
 944     return PAINT_RedrawWindow( hwnd, rectUpdate, hrgnUpdate, flags, 0 );
 945 }
 946
 947
 948 /***********************************************************************
 949  *           RedrawWindow16    (USER.290)
 950  */
 951 BOOL16 WINAPI RedrawWindow16( HWND16 hwnd, const RECT16 *rectUpdate,
 952                               HRGN16 hrgnUpdate, UINT16 flags )
 953 {
 954     if (rectUpdate)
 955     {
 956         RECT r;
 957         CONV_RECT16TO32( rectUpdate, &r );
 958         return (BOOL16)RedrawWindow( (HWND)hwnd, &r, hrgnUpdate, flags );
 959     }
 960     return (BOOL16)PAINT_RedrawWindow( (HWND)hwnd, NULL,
 961                                        (HRGN)hrgnUpdate, flags, 0 );
 962 }
 963
 964
 965 /***********************************************************************
 966  *           UpdateWindow16   (USER.124)
 967  */
 968 void WINAPI UpdateWindow16( HWND16 hwnd )
 969 {
 970     PAINT_RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN, 0 );
 971 }
 972
 973 /***********************************************************************
 974  *           UpdateWindow32   (USER32.567)
 975  */
 976 void WINAPI UpdateWindow( HWND hwnd )
 977 {
 978     PAINT_RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN, 0 );
 979 }
 980
 981 /***********************************************************************
 982  *           InvalidateRgn16   (USER.126)
 983  */
 984 void WINAPI InvalidateRgn16( HWND16 hwnd, HRGN16 hrgn, BOOL16 erase )
 985 {
 986     PAINT_RedrawWindow((HWND)hwnd, NULL, (HRGN)hrgn,
 987                        RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
 988 }
 989
 990
 991 /***********************************************************************
 992  *           InvalidateRgn32   (USER32.329)
 993  */
 994 BOOL WINAPI InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
 995 {
 996     return PAINT_RedrawWindow(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
 997 }
 998
 999
1000 /***********************************************************************
1001  *           InvalidateRect16   (USER.125)
1002  */
1003 void WINAPI InvalidateRect16( HWND16 hwnd, const RECT16 *rect, BOOL16 erase )
1004 {
1005     RedrawWindow16( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
1006 }
1007
1008
1009 /***********************************************************************
1010  *           InvalidateRect32   (USER32.328)
1011  */
1012 BOOL WINAPI InvalidateRect( HWND hwnd, const RECT *rect, BOOL erase )
1013 {
1014     return PAINT_RedrawWindow( hwnd, rect, 0,
1015                                RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
1016 }
1017
1018
1019 /***********************************************************************
1020  *           ValidateRgn16   (USER.128)
1021  */
1022 void WINAPI ValidateRgn16( HWND16 hwnd, HRGN16 hrgn )
1023 {
1024     PAINT_RedrawWindow( (HWND)hwnd, NULL, (HRGN)hrgn,
1025                         RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1026 }
1027
1028
1029 /***********************************************************************
1030  *           ValidateRgn32   (USER32.572)
1031  */
1032 void WINAPI ValidateRgn( HWND hwnd, HRGN hrgn )
1033 {
1034     PAINT_RedrawWindow( hwnd, NULL, hrgn, RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1035 }
1036
1037
1038 /***********************************************************************
1039  *           ValidateRect16   (USER.127)
1040  */
1041 void WINAPI ValidateRect16( HWND16 hwnd, const RECT16 *rect )
1042 {
1043     RedrawWindow16( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN );
1044 }
1045
1046
1047 /***********************************************************************
1048  *           ValidateRect32   (USER32.571)
1049  */
1050 void WINAPI ValidateRect( HWND hwnd, const RECT *rect )
1051 {
1052     PAINT_RedrawWindow( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1053 }
1054
1055
1056 /***********************************************************************
1057  *           GetUpdateRect16   (USER.190)
1058  */
1059 BOOL16 WINAPI GetUpdateRect16( HWND16 hwnd, LPRECT16 rect, BOOL16 erase )
1060 {
1061     RECT r;
1062     BOOL16 ret;
1063
1064     if (!rect) return GetUpdateRect( hwnd, NULL, erase );
1065     ret = GetUpdateRect( hwnd, &r, erase );
1066     CONV_RECT32TO16( &r, rect );
1067     return ret;
1068 }
1069
1070
1071 /***********************************************************************
1072  *           GetUpdateRect32   (USER32.297)
1073  */
1074 BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
1075 {
1076     BOOL retvalue;
1077     WND * wndPtr = WIN_FindWndPtr( hwnd );
1078     if (!wndPtr) return FALSE;
1079
1080     if (rect)
1081     {
1082         if (wndPtr->hrgnUpdate > 1)
1083         {
1084             HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
1085             if (GetUpdateRgn( hwnd, hrgn, erase ) == ERROR)
1086             {
1087                 retvalue = FALSE;
1088                 goto END;
1089             }
1090             GetRgnBox( hrgn, rect );
1091             DeleteObject( hrgn );
1092             if (GetClassLongA(wndPtr->hwndSelf, GCL_STYLE) & CS_OWNDC)
1093             {
1094                 if (GetMapMode(wndPtr->dce->hDC) != MM_TEXT)
1095                 {
1096                     DPtoLP (wndPtr->dce->hDC, (LPPOINT)rect,  2);
1097                 }
1098             }
1099         }
1100         else
1101         if( wndPtr->hrgnUpdate == 1 )
1102         {
1103             GetClientRect( hwnd, rect );
1104             if (erase) RedrawWindow( hwnd, NULL, 0, RDW_FRAME | RDW_ERASENOW | RDW_NOCHILDREN );
1105         }
1106         else
1107             SetRectEmpty( rect );
1108     }
1109     retvalue = (wndPtr->hrgnUpdate >= 1);
1110 END:
1111     WIN_ReleaseWndPtr(wndPtr);
1112     return retvalue;
1113 }
1114
1115
1116 /***********************************************************************
1117  *           GetUpdateRgn16   (USER.237)
1118  */
1119 INT16 WINAPI GetUpdateRgn16( HWND16 hwnd, HRGN16 hrgn, BOOL16 erase )
1120 {
1121     return GetUpdateRgn( hwnd, hrgn, erase );
1122 }
1123
1124
1125 /***********************************************************************
1126  *           GetUpdateRgn    (USER32.298)
1127  */
1128 INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1129 {
1130     INT retval;
1131     WND * wndPtr = WIN_FindWndPtr( hwnd );
1132     if (!wndPtr) return ERROR;
1133
1134     if (wndPtr->hrgnUpdate == 0)
1135     {
1136         SetRectRgn( hrgn, 0, 0, 0, 0 );
1137         retval = NULLREGION;
1138         goto END;
1139     }
1140     else
1141     if (wndPtr->hrgnUpdate == 1)
1142     {
1143         SetRectRgn( hrgn, 0, 0, wndPtr->rectClient.right - wndPtr->rectClient.left,
1144                                 wndPtr->rectClient.bottom - wndPtr->rectClient.top );
1145         retval = SIMPLEREGION;
1146     }
1147     else
1148     {
1149         retval = CombineRgn( hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY );
1150         OffsetRgn( hrgn, wndPtr->rectWindow.left - wndPtr->rectClient.left,
1151                          wndPtr->rectWindow.top - wndPtr->rectClient.top );
1152     }
1153     if (erase) RedrawWindow( hwnd, NULL, 0, RDW_ERASENOW | RDW_NOCHILDREN );
1154 END:
1155     WIN_ReleaseWndPtr(wndPtr);
1156     return retval;
1157 }
1158
1159
1160 /***********************************************************************
1161  *           ExcludeUpdateRgn16   (USER.238)
1162  */
1163 INT16 WINAPI ExcludeUpdateRgn16( HDC16 hdc, HWND16 hwnd )
1164 {
1165     return ExcludeUpdateRgn( hdc, hwnd );
1166 }
1167
1168
1169 /***********************************************************************
1170  *           ExcludeUpdateRgn32   (USER32.195)
1171  */
1172 INT WINAPI ExcludeUpdateRgn( HDC hdc, HWND hwnd )
1173 {
1174     RECT rect;
1175     WND * wndPtr;
1176
1177     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return ERROR;
1178
1179     if (wndPtr->hrgnUpdate)
1180     {
1181         INT ret;
1182         HRGN hrgn = CreateRectRgn(wndPtr->rectWindow.left - wndPtr->rectClient.left,
1183                                       wndPtr->rectWindow.top - wndPtr->rectClient.top,
1184                                       wndPtr->rectWindow.right - wndPtr->rectClient.left,
1185                                       wndPtr->rectWindow.bottom - wndPtr->rectClient.top);
1186         if( wndPtr->hrgnUpdate > 1 )
1187         {
1188             CombineRgn(hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY);
1189             OffsetRgn(hrgn, wndPtr->rectWindow.left - wndPtr->rectClient.left,
1190                             wndPtr->rectWindow.top - wndPtr->rectClient.top );
1191         }
1192
1193         /* do ugly coordinate translations in dce.c */
1194
1195         ret = DCE_ExcludeRgn( hdc, wndPtr, hrgn );
1196         DeleteObject( hrgn );
1197         WIN_ReleaseWndPtr(wndPtr);
1198         return ret;
1199     }
1200     WIN_ReleaseWndPtr(wndPtr);
1201     return GetClipBox( hdc, &rect );
1202 }
1203
1204