rcPaint has to be returned in logical coordinates but was intersected
[wine] / 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     RECT16 clipRect, clientRect;
268     WND *wndPtr = WIN_FindWndPtr( hwnd );
269     if (!wndPtr) return 0;
270
271     bIcon = (wndPtr->dwStyle & WS_MINIMIZE && GetClassWord(wndPtr->hwndSelf, GCW_HICON));
272
273     wndPtr->flags &= ~WIN_NEEDS_BEGINPAINT;
274
275     /* send WM_NCPAINT and make sure hrgnUpdate is a valid rgn handle */
276     WIN_UpdateNCRgn( wndPtr, 0, UNC_UPDATE | UNC_IN_BEGINPAINT);
277
278     /*
279      * Make sure the window is still a window. All window locks are suspended
280      * when the WM_NCPAINT is sent.
281      */
282     if (!IsWindow(wndPtr->hwndSelf))
283     {
284         WIN_ReleaseWndPtr(wndPtr);
285         return 0;
286     }
287
288     if( ((hrgnUpdate = wndPtr->hrgnUpdate) != 0) || (wndPtr->flags & WIN_INTERNAL_PAINT))
289         QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
290
291     wndPtr->hrgnUpdate = 0;
292     wndPtr->flags &= ~WIN_INTERNAL_PAINT;
293
294     HideCaret( hwnd );
295
296     TRACE_(win)("hrgnUpdate = %04x, \n", hrgnUpdate);
297
298     if (GetClassWord16(wndPtr->hwndSelf, GCW_STYLE) & CS_PARENTDC)
299     {
300         /* Don't clip the output to the update region for CS_PARENTDC window */
301         if( hrgnUpdate ) 
302             DeleteObject(hrgnUpdate);
303         lps->hdc = GetDCEx16( hwnd, 0, DCX_WINDOWPAINT | DCX_USESTYLE |
304                               (bIcon ? DCX_WINDOW : 0) );
305     }
306     else
307     {
308         if( hrgnUpdate ) /* convert to client coordinates */
309             OffsetRgn( hrgnUpdate, wndPtr->rectWindow.left - wndPtr->rectClient.left,
310                                    wndPtr->rectWindow.top - wndPtr->rectClient.top );
311         lps->hdc = GetDCEx16(hwnd, hrgnUpdate, DCX_INTERSECTRGN |
312                              DCX_WINDOWPAINT | DCX_USESTYLE | (bIcon ? DCX_WINDOW : 0) );
313         /* ReleaseDC() in EndPaint() will delete the region */
314     }
315
316     TRACE_(win)("hdc = %04x\n", lps->hdc);
317
318     if (!lps->hdc)
319     {
320         WARN_(win)("GetDCEx() failed in BeginPaint(), hwnd=%04x\n", hwnd);
321         WIN_ReleaseWndPtr(wndPtr);
322         return 0;
323     }
324
325     /* It is possible that the clip box is bigger than the window itself,
326        if CS_PARENTDC flag is set. Windows never return a paint rect bigger
327        than the window itself, so we need to intersect the cliprect with
328        the window  */
329     
330     GetClipBox16( lps->hdc, &clipRect );
331     GetClientRect16( hwnd, &clientRect );
332
333     /* The rect obtained by GetClipBox is in logical, so make the client in logical to*/
334     DPtoLP16(lps->hdc, (LPPOINT16) &clientRect, 2);    
335
336     IntersectRect16(&lps->rcPaint, &clientRect, &clipRect);
337
338     TRACE_(win)("box = (%i,%i - %i,%i)\n", lps->rcPaint.left, lps->rcPaint.top,
339                     lps->rcPaint.right, lps->rcPaint.bottom );
340
341     if (wndPtr->flags & WIN_NEEDS_ERASEBKGND)
342     {
343         wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
344         lps->fErase = !SendMessage16(hwnd, (bIcon) ? WM_ICONERASEBKGND
345                                                    : WM_ERASEBKGND,
346                                      (WPARAM16)lps->hdc, 0 );
347     }
348     else lps->fErase = TRUE;
349
350     WIN_ReleaseWndPtr(wndPtr);
351     return lps->hdc;
352 }
353
354
355 /***********************************************************************
356  *           BeginPaint32    (USER32.10)
357  */
358 HDC WINAPI BeginPaint( HWND hwnd, PAINTSTRUCT *lps )
359 {
360     PAINTSTRUCT16 ps;
361
362     BeginPaint16( hwnd, &ps );
363     lps->hdc            = (HDC)ps.hdc;
364     lps->fErase         = ps.fErase;
365     lps->rcPaint.top    = ps.rcPaint.top;
366     lps->rcPaint.left   = ps.rcPaint.left;
367     lps->rcPaint.right  = ps.rcPaint.right;
368     lps->rcPaint.bottom = ps.rcPaint.bottom;
369     lps->fRestore       = ps.fRestore;
370     lps->fIncUpdate     = ps.fIncUpdate;
371     return lps->hdc;
372 }
373
374
375 /***********************************************************************
376  *           EndPaint16    (USER.40)
377  */
378 BOOL16 WINAPI EndPaint16( HWND16 hwnd, const PAINTSTRUCT16* lps )
379 {
380     ReleaseDC16( hwnd, lps->hdc );
381     ShowCaret( hwnd );
382     return TRUE;
383 }
384
385
386 /***********************************************************************
387  *           EndPaint32    (USER32.176)
388  */
389 BOOL WINAPI EndPaint( HWND hwnd, const PAINTSTRUCT *lps )
390 {
391     ReleaseDC( hwnd, lps->hdc );
392     ShowCaret( hwnd );
393     return TRUE;
394 }
395
396
397 /***********************************************************************
398  *           FillWindow    (USER.324)
399  */
400 void WINAPI FillWindow16( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc, HBRUSH16 hbrush )
401 {
402     RECT16 rect;
403     GetClientRect16( hwnd, &rect );
404     DPtoLP16( hdc, (LPPOINT16)&rect, 2 );
405     PaintRect16( hwndParent, hwnd, hdc, hbrush, &rect );
406 }
407
408
409 /***********************************************************************
410  *           PAINT_GetControlBrush
411  */
412 static HBRUSH16 PAINT_GetControlBrush( HWND hParent, HWND hWnd, HDC16 hDC, UINT16 ctlType )
413 {
414     HBRUSH16 bkgBrush = (HBRUSH16)SendMessageA( hParent, WM_CTLCOLORMSGBOX + ctlType, 
415                                                              (WPARAM)hDC, (LPARAM)hWnd );
416     if( !IsGDIObject16(bkgBrush) )
417         bkgBrush = DEFWND_ControlColor( hDC, ctlType );
418     return bkgBrush;
419 }
420
421
422 /***********************************************************************
423  *           PaintRect    (USER.325)
424  */
425 void WINAPI PaintRect16( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc,
426                        HBRUSH16 hbrush, const RECT16 *rect)
427 {
428     if( hbrush <= CTLCOLOR_MAX ) 
429     {
430         if( hwndParent )
431             hbrush = PAINT_GetControlBrush( hwndParent, hwnd, hdc, (UINT16)hbrush );
432         else 
433             return;
434     }
435     if( hbrush ) 
436         FillRect16( hdc, rect, hbrush );
437 }
438
439
440 /***********************************************************************
441  *           GetControlBrush    (USER.326)
442  */
443 HBRUSH16 WINAPI GetControlBrush16( HWND16 hwnd, HDC16 hdc, UINT16 ctlType )
444 {
445     WND* wndPtr = WIN_FindWndPtr( hwnd );
446     HBRUSH16 retvalue;
447
448     if((ctlType <= CTLCOLOR_MAX) && wndPtr )
449     {
450         WND* parent;
451         if( wndPtr->dwStyle & WS_POPUP ) parent = WIN_LockWndPtr(wndPtr->owner);
452         else parent = WIN_LockWndPtr(wndPtr->parent);
453         if( !parent ) parent = wndPtr;
454         retvalue = (HBRUSH16)PAINT_GetControlBrush( parent->hwndSelf, hwnd, hdc, ctlType );
455         WIN_ReleaseWndPtr(parent);
456         goto END;
457     }
458     retvalue = (HBRUSH16)0;
459 END:
460     WIN_ReleaseWndPtr(wndPtr);
461     return retvalue;
462 }
463
464
465 /***********************************************************************
466  *              RDW_ValidateParent [RDW_UpdateRgns() helper] 
467  *
468  *  Validate the portions of parent that are covered by a validated child
469  *  wndPtr = child
470  */
471 void  RDW_ValidateParent(WND *wndChild)  
472 {
473     WND *wndParent = WIN_LockWndPtr(wndChild->parent);
474     WND *wndDesktop = WIN_GetDesktop();
475
476     if ((wndParent) && (wndParent != wndDesktop) && !(wndParent->dwStyle & WS_CLIPCHILDREN))
477     {
478         HRGN hrg;
479         if (wndChild->hrgnUpdate == 1 )
480         {
481             RECT r;
482
483             r.left = 0;
484             r.top = 0;
485             r.right = wndChild->rectWindow.right - wndChild->rectWindow.left;
486             r.bottom = wndChild->rectWindow.bottom - wndChild->rectWindow.top;
487
488             hrg = CreateRectRgnIndirect( &r );
489         }
490         else
491            hrg = wndChild->hrgnUpdate;
492         if (wndParent->hrgnUpdate != 0)
493         {
494             POINT ptOffset;
495             RECT rect, rectParent;
496             if( wndParent->hrgnUpdate == 1 )
497             {
498                RECT r;
499
500                r.left = 0;
501                r.top = 0;
502                r.right = wndParent->rectWindow.right - wndParent->rectWindow.left;
503                r.bottom = wndParent->rectWindow.bottom - wndParent->rectWindow.top;
504
505                wndParent->hrgnUpdate = CreateRectRgnIndirect( &r );
506             }
507             /* we must offset the child region by the offset of the child rect in the parent */
508             GetWindowRect(wndParent->hwndSelf, &rectParent);
509             GetWindowRect(wndChild->hwndSelf, &rect);
510             ptOffset.x = rect.left - rectParent.left;
511             ptOffset.y = rect.top - rectParent.top;
512             OffsetRgn( hrg, ptOffset.x, ptOffset.y );
513             CombineRgn( wndParent->hrgnUpdate, wndParent->hrgnUpdate, hrg, RGN_DIFF );
514             OffsetRgn( hrg, -ptOffset.x, -ptOffset.y );
515         }
516         if (hrg != wndChild->hrgnUpdate) DeleteObject( hrg );
517     }
518     WIN_ReleaseWndPtr(wndParent);
519     WIN_ReleaseDesktop();
520 }
521
522 /***********************************************************************
523  *              RDW_UpdateRgns [RedrawWindow() helper] 
524  *
525  *  Walks the window tree and adds/removes parts of the hRgn to/from update
526  *  regions of windows that overlap it. Also, manages internal paint flags.
527  *
528  *  NOTE: Walks the window tree so the caller must lock it.
529  *        MUST preserve hRgn (can modify but then has to restore).
530  */
531 static void RDW_UpdateRgns( WND* wndPtr, HRGN hRgn, UINT flags, BOOL firstRecursLevel )
532 {
533     /* 
534      * Called only when one of the following is set:
535      * (RDW_INVALIDATE | RDW_VALIDATE | RDW_INTERNALPAINT | RDW_NOINTERNALPAINT)
536      */
537
538     BOOL bHadOne =  wndPtr->hrgnUpdate && hRgn;
539     BOOL bChildren =  ( wndPtr->child && !(flags & RDW_NOCHILDREN) && !(wndPtr->dwStyle & WS_MINIMIZE) 
540                         && ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) );
541     RECT r;
542
543     r.left = 0;
544     r.top = 0;
545     r.right = wndPtr->rectWindow.right - wndPtr->rectWindow.left;
546     r.bottom = wndPtr->rectWindow.bottom - wndPtr->rectWindow.top;
547
548     TRACE_(win)("\thwnd %04x [%04x] -> hrgn [%04x], flags [%04x]\n", wndPtr->hwndSelf, wndPtr->hrgnUpdate, hRgn, flags );
549
550     if( flags & RDW_INVALIDATE )
551     {
552         if( hRgn > 1 )
553         {
554             switch( wndPtr->hrgnUpdate )
555             {
556                 default:
557                         CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate, hRgn, RGN_OR );
558                         /* fall through */
559                 case 0:
560                         wndPtr->hrgnUpdate = REGION_CropRgn( wndPtr->hrgnUpdate, 
561                                                              wndPtr->hrgnUpdate ? wndPtr->hrgnUpdate : hRgn, 
562                                                              &r, NULL );
563                         if( !bHadOne )
564                         {
565                             GetRgnBox( wndPtr->hrgnUpdate, &r );
566                             if( IsRectEmpty( &r ) )
567                             {
568                                 DeleteObject( wndPtr->hrgnUpdate );
569                                 wndPtr->hrgnUpdate = 0;
570                                 goto OUT;
571                             }
572                         }
573                         break;
574                 case 1: /* already an entire window */
575                         break;
576             }
577         }
578         else if( hRgn == 1 )
579         {
580             if( wndPtr->hrgnUpdate > 1 )
581                 DeleteObject( wndPtr->hrgnUpdate );
582             wndPtr->hrgnUpdate = 1;
583         }
584         else
585             hRgn = wndPtr->hrgnUpdate;  /* this is a trick that depends on code in PAINT_RedrawWindow() */
586
587         if( !bHadOne && !(wndPtr->flags & WIN_INTERNAL_PAINT) )
588             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
589
590         if (flags & RDW_FRAME) wndPtr->flags |= WIN_NEEDS_NCPAINT;
591         if (flags & RDW_ERASE) wndPtr->flags |= WIN_NEEDS_ERASEBKGND;
592         flags    |= RDW_FRAME;
593     }
594     else if( flags & RDW_VALIDATE )
595     {
596         if( wndPtr->hrgnUpdate )
597         {
598             if( hRgn > 1 )
599             {
600                 if( wndPtr->hrgnUpdate == 1 )
601                     wndPtr->hrgnUpdate = CreateRectRgnIndirect( &r );
602
603                 if( CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate, hRgn, RGN_DIFF )
604                     == NULLREGION )
605                     goto EMPTY;
606             }
607             else /* validate everything */
608             {
609                 if( wndPtr->hrgnUpdate > 1 )
610                 {
611 EMPTY:
612                     DeleteObject( wndPtr->hrgnUpdate );
613                 }
614                 wndPtr->hrgnUpdate = 0;
615             }
616
617             if( !wndPtr->hrgnUpdate )
618             {
619                 wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
620                 if( !(wndPtr->flags & WIN_INTERNAL_PAINT) )
621                     QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
622             }
623         }
624
625         if (flags & RDW_NOFRAME) wndPtr->flags &= ~WIN_NEEDS_NCPAINT;
626         if (flags & RDW_NOERASE) wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
627
628     }
629
630     if ((firstRecursLevel) && (wndPtr->hrgnUpdate != 0) && (flags & RDW_UPDATENOW))
631         RDW_ValidateParent(wndPtr); /* validate parent covered by region */
632
633     /* in/validate child windows that intersect with the region if it
634      * is a valid handle. */
635
636     if( flags & (RDW_INVALIDATE | RDW_VALIDATE) )
637     {
638         if( hRgn > 1 && bChildren )
639         {
640             WND* wnd = wndPtr->child;
641             POINT ptTotal, prevOrigin = {0,0};
642             POINT ptClient;
643
644             ptClient.x = wndPtr->rectClient.left - wndPtr->rectWindow.left;
645             ptClient.y = wndPtr->rectClient.top - wndPtr->rectWindow.top;
646
647             for( ptTotal.x = ptTotal.y = 0; wnd; wnd = wnd->next )
648             {
649                 if( wnd->dwStyle & WS_VISIBLE )
650                 {
651                     POINT ptOffset;
652
653                     r.left = wnd->rectWindow.left + ptClient.x;
654                     r.right = wnd->rectWindow.right + ptClient.x;
655                     r.top = wnd->rectWindow.top + ptClient.y;
656                     r.bottom = wnd->rectWindow.bottom + ptClient.y;
657
658                     ptOffset.x = r.left - prevOrigin.x; 
659                     ptOffset.y = r.top - prevOrigin.y;
660                     OffsetRect( &r, -ptTotal.x, -ptTotal.y );
661
662                     if( RectInRegion( hRgn, &r ) )
663                     {
664                         OffsetRgn( hRgn, -ptOffset.x, -ptOffset.y );
665                         RDW_UpdateRgns( wnd, hRgn, flags, FALSE );
666                         prevOrigin.x = r.left + ptTotal.x;
667                         prevOrigin.y = r.top + ptTotal.y;
668                         ptTotal.x += ptOffset.x;
669                         ptTotal.y += ptOffset.y;
670                     }
671                 }
672             }
673             OffsetRgn( hRgn, ptTotal.x, ptTotal.y );
674             bChildren = 0;
675         }
676     }
677
678     /* handle hRgn == 1 (alias for entire window) and/or internal paint recursion */
679
680     if( bChildren )
681     {
682         WND* wnd;
683         for( wnd = wndPtr->child; wnd; wnd = wnd->next )
684              if( wnd->dwStyle & WS_VISIBLE )
685                  RDW_UpdateRgns( wnd, hRgn, flags, FALSE );
686     }
687
688 OUT:
689
690     /* Set/clear internal paint flag */
691
692     if (flags & RDW_INTERNALPAINT)
693     {
694         if ( !wndPtr->hrgnUpdate && !(wndPtr->flags & WIN_INTERNAL_PAINT))
695             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
696         wndPtr->flags |= WIN_INTERNAL_PAINT;
697     }
698     else if (flags & RDW_NOINTERNALPAINT)
699     {
700         if ( !wndPtr->hrgnUpdate && (wndPtr->flags & WIN_INTERNAL_PAINT))
701             QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
702         wndPtr->flags &= ~WIN_INTERNAL_PAINT;
703     }
704 }
705
706 /***********************************************************************
707  *           RDW_Paint [RedrawWindow() helper]
708  *
709  * Walks the window tree and paints/erases windows that have
710  * nonzero update regions according to redraw flags. hrgn is a scratch
711  * region passed down during recursion. Must not be 1.
712  *
713  */
714 static HRGN RDW_Paint( WND* wndPtr, HRGN hrgn, UINT flags, UINT ex )
715 {
716 /* NOTE: wndPtr is locked by caller.
717  * 
718  * FIXME: Windows uses WM_SYNCPAINT to cut down the number of intertask
719  * SendMessage() calls. This is a comment inside DefWindowProc() source
720  * from 16-bit SDK:
721  *
722  *   This message avoids lots of inter-app message traffic
723  *   by switching to the other task and continuing the
724  *   recursion there.
725  *
726  * wParam         = flags
727  * LOWORD(lParam) = hrgnClip
728  * HIWORD(lParam) = hwndSkip  (not used; always NULL)
729  *
730  */
731     HDC  hDC;
732     HWND hWnd = wndPtr->hwndSelf;
733     BOOL bIcon = ((wndPtr->dwStyle & WS_MINIMIZE) && GetClassWord(wndPtr->hwndSelf, GCW_HICON)); 
734
735       /* Erase/update the window itself ... */
736
737     TRACE_(win)("\thwnd %04x [%04x] -> hrgn [%04x], flags [%04x]\n", hWnd, wndPtr->hrgnUpdate, hrgn, flags );
738
739     /*
740      * Check if this window should delay it's processing of WM_NCPAINT.
741      * See WIN_HaveToDelayNCPAINT for a description of the mechanism
742      */
743     if ((ex & RDW_EX_DELAY_NCPAINT) || WIN_HaveToDelayNCPAINT(wndPtr, 0) )
744         ex |= RDW_EX_DELAY_NCPAINT;
745
746     if (flags & RDW_UPDATENOW)
747     {
748         if (wndPtr->hrgnUpdate) /* wm_painticon wparam is 1 */
749             SendMessage16( hWnd, (bIcon) ? WM_PAINTICON : WM_PAINT, bIcon, 0 );
750     }
751     else if ((flags & RDW_ERASENOW) || (ex & RDW_EX_TOPFRAME))
752     {
753         UINT dcx = DCX_INTERSECTRGN | DCX_USESTYLE | DCX_KEEPCLIPRGN | DCX_WINDOWPAINT | DCX_CACHE;
754         HRGN hrgnRet;
755
756         hrgnRet = WIN_UpdateNCRgn(wndPtr, 
757                                   hrgn, 
758                                   UNC_REGION | UNC_CHECK | 
759                                   ((ex & RDW_EX_TOPFRAME) ? UNC_ENTIRE : 0) |
760                                   ((ex & RDW_EX_DELAY_NCPAINT) ? UNC_DELAY_NCPAINT : 0) ); 
761
762         if( hrgnRet )
763         {
764             if( hrgnRet > 1 ) hrgn = hrgnRet; else hrgnRet = 0; /* entire client */
765             if( wndPtr->flags & WIN_NEEDS_ERASEBKGND )
766             {
767                 if( bIcon ) dcx |= DCX_WINDOW;
768                 else 
769                 if( hrgnRet )
770                     OffsetRgn( hrgnRet, wndPtr->rectWindow.left - wndPtr->rectClient.left, 
771                                         wndPtr->rectWindow.top  - wndPtr->rectClient.top);
772                 else
773                     dcx &= ~DCX_INTERSECTRGN;
774                 if (( hDC = GetDCEx( hWnd, hrgnRet, dcx )) )
775                 {
776                     if (SendMessage16( hWnd, (bIcon) ? WM_ICONERASEBKGND
777                                        : WM_ERASEBKGND, (WPARAM16)hDC, 0 ))
778                     wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
779                     ReleaseDC( hWnd, hDC );
780                 }
781             }
782         }
783     }
784
785     if( !IsWindow(hWnd) ) return hrgn;
786     ex &= ~RDW_EX_TOPFRAME;
787
788       /* ... and its child windows */
789
790     if( wndPtr->child && !(flags & RDW_NOCHILDREN) && !(wndPtr->dwStyle & WS_MINIMIZE) 
791         && ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) )
792     {
793         WND** list, **ppWnd;
794
795         if( (list = WIN_BuildWinArray( wndPtr, 0, NULL )) )
796         {
797             wndPtr = NULL;
798             for (ppWnd = list; *ppWnd; ppWnd++)
799             {
800                 WIN_UpdateWndPtr(&wndPtr,*ppWnd);
801                 if (!IsWindow(wndPtr->hwndSelf)) continue;
802                     if ( (wndPtr->dwStyle & WS_VISIBLE) &&
803                          (wndPtr->hrgnUpdate || (wndPtr->flags & WIN_INTERNAL_PAINT)) )
804                         hrgn = RDW_Paint( wndPtr, hrgn, flags, ex );
805             }
806             WIN_ReleaseWndPtr(wndPtr);
807             WIN_ReleaseWinArray(list);
808         }
809     }
810
811     return hrgn;
812 }
813
814 /***********************************************************************
815  *           PAINT_RedrawWindow
816  *
817  */
818 BOOL PAINT_RedrawWindow( HWND hwnd, const RECT *rectUpdate,
819                            HRGN hrgnUpdate, UINT flags, UINT ex )
820 {
821     HRGN hRgn = 0;
822     RECT r, r2;
823     POINT pt;
824     WND* wndPtr;
825
826     if (!hwnd) hwnd = GetDesktopWindow();
827     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return FALSE;
828
829     /* check if the window or its parents are visible/not minimized */
830
831     if (!WIN_IsWindowDrawable( wndPtr, !(flags & RDW_FRAME) ) )
832     {
833         WIN_ReleaseWndPtr(wndPtr);
834         return TRUE; 
835     }
836
837     if (TRACE_ON(win))
838     {
839         if( hrgnUpdate )
840         {
841             GetRgnBox( hrgnUpdate, &r );
842             TRACE_(win)( "%04x (%04x) NULL %04x box (%i,%i-%i,%i) flags=%04x, exflags=%04x\n", 
843                   hwnd, wndPtr->hrgnUpdate, hrgnUpdate, r.left, r.top, r.right, r.bottom, flags, ex);
844         }
845         else
846         {
847             if( rectUpdate )
848                 r = *rectUpdate;
849             else
850                 SetRectEmpty( &r );
851             TRACE_(win)( "%04x (%04x) %s %d,%d-%d,%d %04x flags=%04x, exflags=%04x\n",
852                         hwnd, wndPtr->hrgnUpdate, rectUpdate ? "rect" : "NULL", r.left, 
853                         r.top, r.right, r.bottom, hrgnUpdate, flags, ex );
854         }
855     }
856
857     /* prepare an update region in window coordinates */
858
859     if( flags & RDW_FRAME )
860         r = wndPtr->rectWindow;
861     else
862         r = wndPtr->rectClient;
863
864     if( ex & RDW_EX_XYWINDOW )
865     {
866         pt.x = pt.y = 0;
867         OffsetRect( &r, -wndPtr->rectWindow.left, -wndPtr->rectWindow.top );
868     }
869     else
870     {
871         pt.x = wndPtr->rectClient.left - wndPtr->rectWindow.left;
872         pt.y = wndPtr->rectClient.top - wndPtr->rectWindow.top;
873         OffsetRect( &r, -wndPtr->rectClient.left, -wndPtr->rectClient.top );
874     }
875
876     if (flags & RDW_INVALIDATE)  /* ------------------------- Invalidate */
877     {
878         /* If the window doesn't have hrgnUpdate we leave hRgn zero
879          * and put a new region straight into wndPtr->hrgnUpdate
880          * so that RDW_UpdateRgns() won't have to do any extra work.
881          */
882
883         if( hrgnUpdate )
884         {
885             if( wndPtr->hrgnUpdate )
886                 hRgn = REGION_CropRgn( 0, hrgnUpdate, NULL, &pt );
887             else 
888                 wndPtr->hrgnUpdate = REGION_CropRgn( 0, hrgnUpdate, &r, &pt ); 
889         }
890         else if( rectUpdate )
891         {
892             if( !IntersectRect( &r2, &r, rectUpdate ) ) goto END;
893             OffsetRect( &r2, pt.x, pt.y );
894
895 rect2i:
896             if( wndPtr->hrgnUpdate == 0 )
897                 wndPtr->hrgnUpdate = CreateRectRgnIndirect( &r2 );
898             else
899                 hRgn = CreateRectRgnIndirect( &r2 );
900         }
901         else /* entire window or client depending on RDW_FRAME */
902         {
903             if( flags & RDW_FRAME )
904             {
905                 if( wndPtr->hrgnUpdate )
906                     DeleteObject( wndPtr->hrgnUpdate );
907                 wndPtr->hrgnUpdate = 1;
908             }
909             else
910             {
911                 GETCLIENTRECTW( wndPtr, r2 );
912                 goto rect2i;
913             }
914         }
915     }
916     else if (flags & RDW_VALIDATE)  /* ------------------------- Validate */
917     {
918         /* In this we cannot leave with zero hRgn */
919         if( hrgnUpdate )
920         {
921             hRgn = REGION_CropRgn( hRgn, hrgnUpdate,  &r, &pt );
922             GetRgnBox( hRgn, &r2 );
923             if( IsRectEmpty( &r2 ) ) goto END;
924         }
925         else if( rectUpdate )
926         {
927             if( !IntersectRect( &r2, &r, rectUpdate ) ) goto END;
928                 OffsetRect( &r2, pt.x, pt.y );
929 rect2v:
930             hRgn = CreateRectRgnIndirect( &r2 );
931         }
932         else /* entire window or client depending on RDW_FRAME */
933         {
934             if( flags & RDW_FRAME ) 
935                 hRgn = 1;
936             else
937             {
938                 GETCLIENTRECTW( wndPtr, r2 );
939                 goto rect2v;
940             }
941         }
942     }
943
944     /* At this point hRgn is either an update region in window coordinates or 1 or 0 */
945
946     RDW_UpdateRgns( wndPtr, hRgn, flags, TRUE );
947
948     /* Erase/update windows, from now on hRgn is a scratch region */
949
950     hRgn = RDW_Paint( wndPtr, (hRgn == 1) ? 0 : hRgn, flags, ex );
951
952 END:
953     if( hRgn > 1 && (hRgn != hrgnUpdate) )
954         DeleteObject(hRgn );
955     WIN_ReleaseWndPtr(wndPtr);
956     return TRUE;
957 }
958
959
960 /***********************************************************************
961  *           RedrawWindow32    (USER32.426)
962  */
963 BOOL WINAPI RedrawWindow( HWND hwnd, const RECT *rectUpdate,
964                               HRGN hrgnUpdate, UINT flags )
965 {
966     return PAINT_RedrawWindow( hwnd, rectUpdate, hrgnUpdate, flags, 0 );
967 }
968
969
970 /***********************************************************************
971  *           RedrawWindow16    (USER.290)
972  */
973 BOOL16 WINAPI RedrawWindow16( HWND16 hwnd, const RECT16 *rectUpdate,
974                               HRGN16 hrgnUpdate, UINT16 flags )
975 {
976     if (rectUpdate)
977     {
978         RECT r;
979         CONV_RECT16TO32( rectUpdate, &r );
980         return (BOOL16)RedrawWindow( (HWND)hwnd, &r, hrgnUpdate, flags );
981     }
982     return (BOOL16)PAINT_RedrawWindow( (HWND)hwnd, NULL, 
983                                        (HRGN)hrgnUpdate, flags, 0 );
984 }
985
986
987 /***********************************************************************
988  *           UpdateWindow16   (USER.124)
989  */
990 void WINAPI UpdateWindow16( HWND16 hwnd )
991 {
992     PAINT_RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN, 0 );
993 }
994
995 /***********************************************************************
996  *           UpdateWindow32   (USER32.567)
997  */
998 void WINAPI UpdateWindow( HWND hwnd )
999 {
1000     PAINT_RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN, 0 );
1001 }
1002
1003 /***********************************************************************
1004  *           InvalidateRgn16   (USER.126)
1005  */
1006 void WINAPI InvalidateRgn16( HWND16 hwnd, HRGN16 hrgn, BOOL16 erase )
1007 {
1008     PAINT_RedrawWindow((HWND)hwnd, NULL, (HRGN)hrgn, 
1009                        RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
1010 }
1011
1012
1013 /***********************************************************************
1014  *           InvalidateRgn32   (USER32.329)
1015  */
1016 BOOL WINAPI InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1017 {
1018     return PAINT_RedrawWindow(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
1019 }
1020
1021
1022 /***********************************************************************
1023  *           InvalidateRect16   (USER.125)
1024  */
1025 void WINAPI InvalidateRect16( HWND16 hwnd, const RECT16 *rect, BOOL16 erase )
1026 {
1027     RedrawWindow16( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
1028 }
1029
1030
1031 /***********************************************************************
1032  *           InvalidateRect32   (USER32.328)
1033  */
1034 BOOL WINAPI InvalidateRect( HWND hwnd, const RECT *rect, BOOL erase )
1035 {
1036     return PAINT_RedrawWindow( hwnd, rect, 0, 
1037                                RDW_INVALIDATE | (erase ? RDW_ERASE : 0), 0 );
1038 }
1039
1040
1041 /***********************************************************************
1042  *           ValidateRgn16   (USER.128)
1043  */
1044 void WINAPI ValidateRgn16( HWND16 hwnd, HRGN16 hrgn )
1045 {
1046     PAINT_RedrawWindow( (HWND)hwnd, NULL, (HRGN)hrgn, 
1047                         RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1048 }
1049
1050
1051 /***********************************************************************
1052  *           ValidateRgn32   (USER32.572)
1053  */
1054 void WINAPI ValidateRgn( HWND hwnd, HRGN hrgn )
1055 {
1056     PAINT_RedrawWindow( hwnd, NULL, hrgn, RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1057 }
1058
1059
1060 /***********************************************************************
1061  *           ValidateRect16   (USER.127)
1062  */
1063 void WINAPI ValidateRect16( HWND16 hwnd, const RECT16 *rect )
1064 {
1065     RedrawWindow16( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN );
1066 }
1067
1068
1069 /***********************************************************************
1070  *           ValidateRect32   (USER32.571)
1071  */
1072 void WINAPI ValidateRect( HWND hwnd, const RECT *rect )
1073 {
1074     PAINT_RedrawWindow( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN, 0 );
1075 }
1076
1077
1078 /***********************************************************************
1079  *           GetUpdateRect16   (USER.190)
1080  */
1081 BOOL16 WINAPI GetUpdateRect16( HWND16 hwnd, LPRECT16 rect, BOOL16 erase )
1082 {
1083     RECT r;
1084     BOOL16 ret;
1085
1086     if (!rect) return GetUpdateRect( hwnd, NULL, erase );
1087     ret = GetUpdateRect( hwnd, &r, erase );
1088     CONV_RECT32TO16( &r, rect );
1089     return ret;
1090 }
1091
1092
1093 /***********************************************************************
1094  *           GetUpdateRect32   (USER32.297)
1095  */
1096 BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
1097 {
1098     BOOL retvalue;
1099     WND * wndPtr = WIN_FindWndPtr( hwnd );
1100     if (!wndPtr) return FALSE;
1101
1102     if (rect)
1103     {
1104         if (wndPtr->hrgnUpdate > 1)
1105         {
1106             HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
1107             if (GetUpdateRgn( hwnd, hrgn, erase ) == ERROR)
1108             {
1109                 retvalue = FALSE;
1110                 goto END;
1111             }
1112             GetRgnBox( hrgn, rect );
1113             DeleteObject( hrgn );
1114             if (GetClassLongA(wndPtr->hwndSelf, GCL_STYLE) & CS_OWNDC)
1115             {
1116                 if (GetMapMode(wndPtr->dce->hDC) != MM_TEXT)
1117                 {
1118                     DPtoLP (wndPtr->dce->hDC, (LPPOINT)rect,  2);
1119                 }
1120             }
1121         }
1122         else
1123         if( wndPtr->hrgnUpdate == 1 )
1124         {
1125             GetClientRect( hwnd, rect );
1126             if (erase) RedrawWindow( hwnd, NULL, 0, RDW_FRAME | RDW_ERASENOW | RDW_NOCHILDREN );
1127         }
1128         else 
1129             SetRectEmpty( rect );
1130     }
1131     retvalue = (wndPtr->hrgnUpdate >= 1);
1132 END:
1133     WIN_ReleaseWndPtr(wndPtr);
1134     return retvalue;
1135 }
1136
1137
1138 /***********************************************************************
1139  *           GetUpdateRgn16   (USER.237)
1140  */
1141 INT16 WINAPI GetUpdateRgn16( HWND16 hwnd, HRGN16 hrgn, BOOL16 erase )
1142 {
1143     return GetUpdateRgn( hwnd, hrgn, erase );
1144 }
1145
1146
1147 /***********************************************************************
1148  *           GetUpdateRgn    (USER32.298)
1149  */
1150 INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1151 {
1152     INT retval;
1153     WND * wndPtr = WIN_FindWndPtr( hwnd );
1154     if (!wndPtr) return ERROR;
1155
1156     if (wndPtr->hrgnUpdate == 0)
1157     {
1158         SetRectRgn( hrgn, 0, 0, 0, 0 );
1159         retval = NULLREGION;
1160         goto END;
1161     }
1162     else
1163     if (wndPtr->hrgnUpdate == 1)
1164     {
1165         SetRectRgn( hrgn, 0, 0, wndPtr->rectClient.right - wndPtr->rectClient.left,
1166                                 wndPtr->rectClient.bottom - wndPtr->rectClient.top );
1167         retval = SIMPLEREGION;
1168     }
1169     else
1170     {
1171         retval = CombineRgn( hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY );
1172         OffsetRgn( hrgn, wndPtr->rectWindow.left - wndPtr->rectClient.left,
1173                          wndPtr->rectWindow.top - wndPtr->rectClient.top );
1174     }
1175     if (erase) RedrawWindow( hwnd, NULL, 0, RDW_ERASENOW | RDW_NOCHILDREN );
1176 END:
1177     WIN_ReleaseWndPtr(wndPtr);
1178     return retval;
1179 }
1180
1181
1182 /***********************************************************************
1183  *           ExcludeUpdateRgn16   (USER.238)
1184  */
1185 INT16 WINAPI ExcludeUpdateRgn16( HDC16 hdc, HWND16 hwnd )
1186 {
1187     return ExcludeUpdateRgn( hdc, hwnd );
1188 }
1189
1190
1191 /***********************************************************************
1192  *           ExcludeUpdateRgn32   (USER32.195)
1193  */
1194 INT WINAPI ExcludeUpdateRgn( HDC hdc, HWND hwnd )
1195 {
1196     RECT rect;
1197     WND * wndPtr;
1198
1199     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return ERROR;
1200
1201     if (wndPtr->hrgnUpdate)
1202     {
1203         INT ret;
1204         HRGN hrgn = CreateRectRgn(wndPtr->rectWindow.left - wndPtr->rectClient.left,
1205                                       wndPtr->rectWindow.top - wndPtr->rectClient.top,
1206                                       wndPtr->rectWindow.right - wndPtr->rectClient.left,
1207                                       wndPtr->rectWindow.bottom - wndPtr->rectClient.top);
1208         if( wndPtr->hrgnUpdate > 1 )
1209         {
1210             CombineRgn(hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY);
1211             OffsetRgn(hrgn, wndPtr->rectWindow.left - wndPtr->rectClient.left, 
1212                             wndPtr->rectWindow.top - wndPtr->rectClient.top );
1213         }
1214
1215         /* do ugly coordinate translations in dce.c */
1216
1217         ret = DCE_ExcludeRgn( hdc, wndPtr, hrgn );
1218         DeleteObject( hrgn );
1219         WIN_ReleaseWndPtr(wndPtr);
1220         return ret;
1221     } 
1222     WIN_ReleaseWndPtr(wndPtr);
1223     return GetClipBox( hdc, &rect );
1224 }
1225
1226