1 /*
2 * Window painting functions
3 *
4 * Copyright 1993, 1994, 1995, 2001, 2004, 2005, 2008 Alexandre Julliard
5 * Copyright 1996, 1997, 1999 Alex Korobka
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 */
21
22 #include "config.h"
23 #include "wine/port.h"
24
25 #include <assert.h>
26 #include <stdarg.h>
27 #include <string.h>
28
29 #include "ntstatus.h"
30 #define WIN32_NO_STATUS
31 #include "windef.h"
32 #include "winbase.h"
33 #include "wingdi.h"
34 #include "winuser.h"
35 #include "wine/server.h"
36 #include "win.h"
37 #include "user_private.h"
38 #include "controls.h"
39 #include "wine/list.h"
40 #include "wine/debug.h"
41
42 WINE_DEFAULT_DEBUG_CHANNEL(win);
43
44
45 struct dce
46 {
47 struct list entry; /* entry in global DCE list */
48 HDC hdc;
49 HWND hwnd;
50 HRGN clip_rgn;
51 DWORD flags;
52 LONG count; /* usage count; 0 or 1 for cache DCEs, always 1 for window DCEs,
53 always >= 1 for class DCEs */
54 };
55
56 static struct list dce_list = LIST_INIT(dce_list);
57
58 static BOOL CALLBACK dc_hook( HDC hDC, WORD code, DWORD_PTR data, LPARAM lParam );
59
60 static const WCHAR displayW[] = { 'D','I','S','P','L','A','Y',0 };
61
62
63 /***********************************************************************
64 * dump_rdw_flags
65 */
66 static void dump_rdw_flags(UINT flags)
67 {
68 TRACE("flags:");
69 if (flags & RDW_INVALIDATE) TRACE(" RDW_INVALIDATE");
70 if (flags & RDW_INTERNALPAINT) TRACE(" RDW_INTERNALPAINT");
71 if (flags & RDW_ERASE) TRACE(" RDW_ERASE");
72 if (flags & RDW_VALIDATE) TRACE(" RDW_VALIDATE");
73 if (flags & RDW_NOINTERNALPAINT) TRACE(" RDW_NOINTERNALPAINT");
74 if (flags & RDW_NOERASE) TRACE(" RDW_NOERASE");
75 if (flags & RDW_NOCHILDREN) TRACE(" RDW_NOCHILDREN");
76 if (flags & RDW_ALLCHILDREN) TRACE(" RDW_ALLCHILDREN");
77 if (flags & RDW_UPDATENOW) TRACE(" RDW_UPDATENOW");
78 if (flags & RDW_ERASENOW) TRACE(" RDW_ERASENOW");
79 if (flags & RDW_FRAME) TRACE(" RDW_FRAME");
80 if (flags & RDW_NOFRAME) TRACE(" RDW_NOFRAME");
81
82 #define RDW_FLAGS \
83 (RDW_INVALIDATE | \
84 RDW_INTERNALPAINT | \
85 RDW_ERASE | \
86 RDW_VALIDATE | \
87 RDW_NOINTERNALPAINT | \
88 RDW_NOERASE | \
89 RDW_NOCHILDREN | \
90 RDW_ALLCHILDREN | \
91 RDW_UPDATENOW | \
92 RDW_ERASENOW | \
93 RDW_FRAME | \
94 RDW_NOFRAME)
95
96 if (flags & ~RDW_FLAGS) TRACE(" %04x", flags & ~RDW_FLAGS);
97 TRACE("\n");
98 #undef RDW_FLAGS
99 }
100
101
102 /***********************************************************************
103 * update_visible_region
104 *
105 * Set the visible region and X11 drawable for the DC associated to
106 * a given window.
107 */
108 static void update_visible_region( struct dce *dce )
109 {
110 NTSTATUS status;
111 HRGN vis_rgn = 0;
112 HWND top_win = 0;
113 DWORD flags = dce->flags;
114 size_t size = 256;
115 RECT win_rect, top_rect;
116
117 /* don't clip siblings if using parent clip region */
118 if (flags & DCX_PARENTCLIP) flags &= ~DCX_CLIPSIBLINGS;
119
120 /* fetch the visible region from the server */
121 do
122 {
123 RGNDATA *data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data) + size - 1 );
124 if (!data) return;
125
126 SERVER_START_REQ( get_visible_region )
127 {
128 req->window = dce->hwnd;
129 req->flags = flags;
130 wine_server_set_reply( req, data->Buffer, size );
131 if (!(status = wine_server_call( req )))
132 {
133 size_t reply_size = wine_server_reply_size( reply );
134 data->rdh.dwSize = sizeof(data->rdh);
135 data->rdh.iType = RDH_RECTANGLES;
136 data->rdh.nCount = reply_size / sizeof(RECT);
137 data->rdh.nRgnSize = reply_size;
138 vis_rgn = ExtCreateRegion( NULL, size, data );
139
140 top_win = reply->top_win;
141 win_rect.left = reply->win_rect.left;
142 win_rect.top = reply->win_rect.top;
143 win_rect.right = reply->win_rect.right;
144 win_rect.bottom = reply->win_rect.bottom;
145 top_rect.left = reply->top_rect.left;
146 top_rect.top = reply->top_rect.top;
147 top_rect.right = reply->top_rect.right;
148 top_rect.bottom = reply->top_rect.bottom;
149 }
150 else size = reply->total_size;
151 }
152 SERVER_END_REQ;
153 HeapFree( GetProcessHeap(), 0, data );
154 } while (status == STATUS_BUFFER_OVERFLOW);
155
156 if (status || !vis_rgn) return;
157
158 USER_Driver->pGetDC( dce->hdc, dce->hwnd, top_win, &win_rect, &top_rect, flags );
159
160 if (dce->clip_rgn) CombineRgn( vis_rgn, vis_rgn, dce->clip_rgn,
161 (flags & DCX_INTERSECTRGN) ? RGN_AND : RGN_DIFF );
162
163 /* map region to DC coordinates */
164 OffsetRgn( vis_rgn, -win_rect.left, -win_rect.top );
165 SelectVisRgn( dce->hdc, vis_rgn );
166 DeleteObject( vis_rgn );
167 }
168
169
170 /***********************************************************************
171 * release_dce
172 */
173 static void release_dce( struct dce *dce )
174 {
175 if (!dce->hwnd) return; /* already released */
176
177 USER_Driver->pReleaseDC( dce->hwnd, dce->hdc );
178
179 if (dce->clip_rgn) DeleteObject( dce->clip_rgn );
180 dce->clip_rgn = 0;
181 dce->hwnd = 0;
182 dce->flags &= DCX_CACHE;
183 }
184
185
186 /***********************************************************************
187 * delete_clip_rgn
188 */
189 static void delete_clip_rgn( struct dce *dce )
190 {
191 if (!dce->clip_rgn) return; /* nothing to do */
192
193 dce->flags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN);
194 DeleteObject( dce->clip_rgn );
195 dce->clip_rgn = 0;
196
197 /* make it dirty so that the vis rgn gets recomputed next time */
198 SetHookFlags( dce->hdc, DCHF_INVALIDATEVISRGN );
199 }
200
201
202 /***********************************************************************
203 * alloc_dce
204 *
205 * Allocate a new DCE.
206 */
207 static struct dce *alloc_dce(void)
208 {
209 struct dce *dce;
210
211 if (!(dce = HeapAlloc( GetProcessHeap(), 0, sizeof(*dce) ))) return NULL;
212 if (!(dce->hdc = CreateDCW( displayW, NULL, NULL, NULL )))
213 {
214 HeapFree( GetProcessHeap(), 0, dce );
215 return 0;
216 }
217 SaveDC( dce->hdc );
218
219 dce->hwnd = 0;
220 dce->clip_rgn = 0;
221 dce->flags = 0;
222 dce->count = 1;
223
224 /* store DCE handle in DC hook data field */
225 SetDCHook( dce->hdc, dc_hook, (DWORD_PTR)dce );
226 SetHookFlags( dce->hdc, DCHF_INVALIDATEVISRGN );
227 return dce;
228 }
229
230
231 /***********************************************************************
232 * get_window_dce
233 */
234 static struct dce *get_window_dce( HWND hwnd )
235 {
236 struct dce *dce;
237 WND *win = WIN_GetPtr( hwnd );
238
239 if (!win || win == WND_OTHER_PROCESS || win == WND_DESKTOP) return NULL;
240
241 dce = win->dce;
242 if (!dce && (dce = get_class_dce( win->class )))
243 {
244 win->dce = dce;
245 dce->count++;
246 }
247 WIN_ReleasePtr( win );
248
249 if (!dce) /* try to allocate one */
250 {
251 struct dce *dce_to_free = NULL;
252 LONG class_style = GetClassLongW( hwnd, GCL_STYLE );
253
254 if (class_style & CS_CLASSDC)
255 {
256 if (!(dce = alloc_dce())) return NULL;
257
258 win = WIN_GetPtr( hwnd );
259 if (win && win != WND_OTHER_PROCESS && win != WND_DESKTOP)
260 {
261 if (win->dce) /* another thread beat us to it */
262 {
263 dce_to_free = dce;
264 dce = win->dce;
265 }
266 else if ((win->dce = set_class_dce( win->class, dce )) != dce)
267 {
268 dce_to_free = dce;
269 dce = win->dce;
270 dce->count++;
271 }
272 else
273 {
274 dce->count++;
275 list_add_tail( &dce_list, &dce->entry );
276 }
277 WIN_ReleasePtr( win );
278 }
279 else dce_to_free = dce;
280 }
281 else if (class_style & CS_OWNDC)
282 {
283 if (!(dce = alloc_dce())) return NULL;
284
285 win = WIN_GetPtr( hwnd );
286 if (win && win != WND_OTHER_PROCESS && win != WND_DESKTOP)
287 {
288 if (win->dwStyle & WS_CLIPCHILDREN) dce->flags |= DCX_CLIPCHILDREN;
289 if (win->dwStyle & WS_CLIPSIBLINGS) dce->flags |= DCX_CLIPSIBLINGS;
290 if (win->dce) /* another thread beat us to it */
291 {
292 dce_to_free = dce;
293 dce = win->dce;
294 }
295 else
296 {
297 win->dce = dce;
298 dce->hwnd = hwnd;
299 list_add_tail( &dce_list, &dce->entry );
300 }
301 WIN_ReleasePtr( win );
302 }
303 else dce_to_free = dce;
304 }
305
306 if (dce_to_free)
307 {
308 SetDCHook( dce->hdc, NULL, 0 );
309 DeleteDC( dce->hdc );
310 HeapFree( GetProcessHeap(), 0, dce );
311 }
312 }
313 return dce;
314 }
315
316
317 /***********************************************************************
318 * free_dce
319 *
320 * Free a class or window DCE.
321 */
322 void free_dce( struct dce *dce, HWND hwnd )
323 {
324 USER_Lock();
325
326 if (dce)
327 {
328 if (!--dce->count)
329 {
330 /* turn it into a cache entry */
331 release_dce( dce );
332 dce->flags |= DCX_CACHE;
333 }
334 else if (dce->hwnd == hwnd)
335 {
336 release_dce( dce );
337 }
338 }
339
340 /* now check for cache DCEs */
341
342 if (hwnd)
343 {
344 LIST_FOR_EACH_ENTRY( dce, &dce_list, struct dce, entry )
345 {
346 if (dce->hwnd != hwnd) continue;
347 if (!(dce->flags & DCX_CACHE)) continue;
348
349 if (dce->count) WARN( "GetDC() without ReleaseDC() for window %p\n", hwnd );
350 dce->count = 0;
351 release_dce( dce );
352 }
353 }
354
355 USER_Unlock();
356 }
357
358
359 /***********************************************************************
360 * make_dc_dirty
361 *
362 * Mark the associated DC as dirty to force a refresh of the visible region
363 */
364 static void make_dc_dirty( struct dce *dce )
365 {
366 if (!dce->count)
367 {
368 /* Don't bother with visible regions of unused DCEs */
369 TRACE("\tpurged %p dce [%p]\n", dce, dce->hwnd);
370 release_dce( dce );
371 }
372 else
373 {
374 /* Set dirty bits in the hDC and DCE structs */
375 TRACE("\tfixed up %p dce [%p]\n", dce, dce->hwnd);
376 SetHookFlags( dce->hdc, DCHF_INVALIDATEVISRGN );
377 }
378 }
379
380
381 /***********************************************************************
382 * invalidate_dce
383 *
384 * It is called from SetWindowPos() - we have to
385 * mark as dirty all busy DCEs for windows that have pWnd->parent as
386 * an ancestor and whose client rect intersects with specified update
387 * rectangle. In addition, pWnd->parent DCEs may need to be updated if
388 * DCX_CLIPCHILDREN flag is set.
389 */
390 void invalidate_dce( HWND hwnd, const RECT *rect )
391 {
392 RECT window_rect, extra_rect;
393 struct dce *dce;
394 HWND hwndScope = GetAncestor( hwnd, GA_PARENT );
395
396 if (!hwndScope) return;
397
398 GetWindowRect( hwnd, &window_rect );
399 if (rect)
400 {
401 extra_rect = *rect;
402 MapWindowPoints( hwndScope, 0, (POINT *)&extra_rect, 2 );
403 }
404
405 TRACE("%p scope hwnd = %p %s (%s)\n",
406 hwnd, hwndScope, wine_dbgstr_rect(&window_rect), wine_dbgstr_rect(rect) );
407
408 /* walk all DCEs and fixup non-empty entries */
409
410 USER_Lock();
411 LIST_FOR_EACH_ENTRY( dce, &dce_list, struct dce, entry )
412 {
413 TRACE( "%p: hwnd %p dcx %08x %s %s\n", dce, dce->hwnd, dce->flags,
414 (dce->flags & DCX_CACHE) ? "Cache" : "Owned", dce->count ? "InUse" : "" );
415
416 if (!dce->hwnd) continue;
417 if ((dce->hwnd == hwndScope) && !(dce->flags & DCX_CLIPCHILDREN))
418 continue; /* child window positions don't bother us */
419
420 /* if DCE window is a child of hwnd, it has to be invalidated */
421 if (dce->hwnd == hwnd || IsChild( hwnd, dce->hwnd ))
422 {
423 make_dc_dirty( dce );
424 }
425 else /* otherwise check if the window rectangle intersects this DCE window */
426 {
427 if (hwndScope == GetDesktopWindow() ||
428 hwndScope == dce->hwnd || IsChild( hwndScope, dce->hwnd ))
429 {
430 RECT dce_rect, tmp;
431 GetWindowRect( dce->hwnd, &dce_rect );
432 if (IntersectRect( &tmp, &dce_rect, &window_rect ) ||
433 (rect && IntersectRect( &tmp, &dce_rect, &extra_rect )))
434 make_dc_dirty( dce );
435 }
436 }
437 }
438 USER_Unlock();
439 }
440
441 /***********************************************************************
442 * release_dc
443 *
444 * Implementation of ReleaseDC.
445 */
446 static INT release_dc( HWND hwnd, HDC hdc, BOOL end_paint )
447 {
448 struct dce *dce;
449 BOOL ret = FALSE;
450
451 TRACE("%p %p\n", hwnd, hdc );
452
453 USER_Lock();
454 dce = (struct dce *)GetDCHook( hdc, NULL );
455 if (dce && dce->count)
456 {
457 if (end_paint || (dce->flags & DCX_CACHE)) delete_clip_rgn( dce );
458 if (dce->flags & DCX_CACHE) dce->count = 0;
459 ret = TRUE;
460 }
461 USER_Unlock();
462 return ret;
463 }
464
465
466 /***********************************************************************
467 * dc_hook
468 *
469 * See "Undoc. Windows" for hints (DC, SetDCHook, SetHookFlags)..
470 */
471 static BOOL CALLBACK dc_hook( HDC hDC, WORD code, DWORD_PTR data, LPARAM lParam )
472 {
473 BOOL retv = TRUE;
474 struct dce *dce = (struct dce *)data;
475
476 TRACE("hDC = %p, %u\n", hDC, code);
477
478 if (!dce) return 0;
479 assert( dce->hdc == hDC );
480
481 switch( code )
482 {
483 case DCHC_INVALIDVISRGN:
484 /* GDI code calls this when it detects that the
485 * DC is dirty (usually after SetHookFlags()). This
486 * means that we have to recompute the visible region.
487 */
488 if (dce->count) update_visible_region( dce );
489 else /* non-fatal but shouldn't happen */
490 WARN("DC is not in use!\n");
491 break;
492 case DCHC_DELETEDC:
493 /*
494 * Windows will not let you delete a DC that is busy
495 * (between GetDC and ReleaseDC)
496 */
497 USER_Lock();
498 if (dce->count)
499 {
500 WARN("Application trying to delete a busy DC %p\n", dce->hdc);
501 retv = FALSE;
502 }
503 else
504 {
505 list_remove( &dce->entry );
506 if (dce->clip_rgn) DeleteObject( dce->clip_rgn );
507 HeapFree( GetProcessHeap(), 0, dce );
508 }
509 USER_Unlock();
510 break;
511 }
512 return retv;
513 }
514
515
516 /***********************************************************************
517 * get_update_region
518 *
519 * Return update region (in screen coordinates) for a window.
520 */
521 static HRGN get_update_region( HWND hwnd, UINT *flags, HWND *child )
522 {
523 HRGN hrgn = 0;
524 NTSTATUS status;
525 RGNDATA *data;
526 size_t size = 256;
527
528 do
529 {
530 if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data) + size - 1 )))
531 {
532 SetLastError( ERROR_OUTOFMEMORY );
533 return 0;
534 }
535
536 SERVER_START_REQ( get_update_region )
537 {
538 req->window = hwnd;
539 req->from_child = child ? *child : 0;
540 req->flags = *flags;
541 wine_server_set_reply( req, data->Buffer, size );
542 if (!(status = wine_server_call( req )))
543 {
544 size_t reply_size = wine_server_reply_size( reply );
545 data->rdh.dwSize = sizeof(data->rdh);
546 data->rdh.iType = RDH_RECTANGLES;
547 data->rdh.nCount = reply_size / sizeof(RECT);
548 data->rdh.nRgnSize = reply_size;
549 hrgn = ExtCreateRegion( NULL, size, data );
550 if (child) *child = reply->child;
551 *flags = reply->flags;
552 }
553 else size = reply->total_size;
554 }
555 SERVER_END_REQ;
556 HeapFree( GetProcessHeap(), 0, data );
557 } while (status == STATUS_BUFFER_OVERFLOW);
558
559 if (status) SetLastError( RtlNtStatusToDosError(status) );
560 return hrgn;
561 }
562
563
564 /***********************************************************************
565 * get_update_flags
566 *
567 * Get only the update flags, not the update region.
568 */
569 static BOOL get_update_flags( HWND hwnd, HWND *child, UINT *flags )
570 {
571 BOOL ret;
572
573 SERVER_START_REQ( get_update_region )
574 {
575 req->window = hwnd;
576 req->from_child = child ? *child : 0;
577 req->flags = *flags | UPDATE_NOREGION;
578 if ((ret = !wine_server_call_err( req )))
579 {
580 if (child) *child = reply->child;
581 *flags = reply->flags;
582 }
583 }
584 SERVER_END_REQ;
585 return ret;
586 }
587
588
589 /***********************************************************************
590 * redraw_window_rects
591 *
592 * Redraw part of a window.
593 */
594 static BOOL redraw_window_rects( HWND hwnd, UINT flags, const RECT *rects, UINT count )
595 {
596 BOOL ret;
597
598 if (!(flags & (RDW_INVALIDATE|RDW_VALIDATE|RDW_INTERNALPAINT|RDW_NOINTERNALPAINT)))
599 return TRUE; /* nothing to do */
600
601 SERVER_START_REQ( redraw_window )
602 {
603 req->window = hwnd;
604 req->flags = flags;
605 wine_server_add_data( req, rects, count * sizeof(RECT) );
606 ret = !wine_server_call_err( req );
607 }
608 SERVER_END_REQ;
609 return ret;
610 }
611
612
613 /***********************************************************************
614 * send_ncpaint
615 *
616 * Send a WM_NCPAINT message if needed, and return the resulting update region (in screen coords).
617 * Helper for erase_now and BeginPaint.
618 */
619 static HRGN send_ncpaint( HWND hwnd, HWND *child, UINT *flags )
620 {
621 HRGN whole_rgn = get_update_region( hwnd, flags, child );
622 HRGN client_rgn = 0;
623
624 if (child) hwnd = *child;
625
626 if (whole_rgn)
627 {
628 RECT client, update;
629 INT type;
630
631 /* check if update rgn overlaps with nonclient area */
632 type = GetRgnBox( whole_rgn, &update );
633 GetClientRect( hwnd, &client );
634 MapWindowPoints( hwnd, 0, (POINT *)&client, 2 );
635
636 if ((*flags & UPDATE_NONCLIENT) ||
637 update.left < client.left || update.top < client.top ||
638 update.right > client.right || update.bottom > client.bottom)
639 {
640 client_rgn = CreateRectRgnIndirect( &client );
641 CombineRgn( client_rgn, client_rgn, whole_rgn, RGN_AND );
642
643 /* check if update rgn contains complete nonclient area */
644 if (type == SIMPLEREGION)
645 {
646 RECT window;
647 GetWindowRect( hwnd, &window );
648 if (EqualRect( &window, &update ))
649 {
650 DeleteObject( whole_rgn );
651 whole_rgn = (HRGN)1;
652 }
653 }
654 }
655 else
656 {
657 client_rgn = whole_rgn;
658 whole_rgn = 0;
659 }
660
661 if (whole_rgn) /* NOTE: WM_NCPAINT allows wParam to be 1 */
662 {
663 if (*flags & UPDATE_NONCLIENT) SendMessageW( hwnd, WM_NCPAINT, (WPARAM)whole_rgn, 0 );
664 if (whole_rgn > (HRGN)1) DeleteObject( whole_rgn );
665 }
666 }
667 return client_rgn;
668 }
669
670
671 /***********************************************************************
672 * send_erase
673 *
674 * Send a WM_ERASEBKGND message if needed, and optionally return the DC for painting.
675 * If a DC is requested, the region is selected into it. In all cases the region is deleted.
676 * Helper for erase_now and BeginPaint.
677 */
678 static BOOL send_erase( HWND hwnd, UINT flags, HRGN client_rgn,
679 RECT *clip_rect, HDC *hdc_ret )
680 {
681 BOOL need_erase = (flags & UPDATE_DELAYED_ERASE) != 0;
682 HDC hdc = 0;
683 RECT dummy;
684
685 if (!clip_rect) clip_rect = &dummy;
686 if (hdc_ret || (flags & UPDATE_ERASE))
687 {
688 UINT dcx_flags = DCX_INTERSECTRGN | DCX_USESTYLE;
689 if (IsIconic(hwnd)) dcx_flags |= DCX_WINDOW;
690
691 if ((hdc = GetDCEx( hwnd, client_rgn, dcx_flags )))
692 {
693 INT type = GetClipBox( hdc, clip_rect );
694
695 if (flags & UPDATE_ERASE)
696 {
697 /* don't erase if the clip box is empty */
698 if (type != NULLREGION)
699 need_erase = !SendMessageW( hwnd, WM_ERASEBKGND, (WPARAM)hdc, 0 );
700 }
701 if (!hdc_ret) release_dc( hwnd, hdc, TRUE );
702 }
703
704 if (hdc_ret) *hdc_ret = hdc;
705 }
706 if (!hdc) DeleteObject( client_rgn );
707 return need_erase;
708 }
709
710
711 /***********************************************************************
712 * erase_now
713 *
714 * Implementation of RDW_ERASENOW behavior.
715 */
716 void erase_now( HWND hwnd, UINT rdw_flags )
717 {
718 HWND child = 0;
719 HRGN hrgn;
720 BOOL need_erase = FALSE;
721
722 /* loop while we find a child to repaint */
723 for (;;)
724 {
725 UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE;
726
727 if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
728 else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
729 if (need_erase) flags |= UPDATE_DELAYED_ERASE;
730
731 if (!(hrgn = send_ncpaint( hwnd, &child, &flags ))) break;
732 need_erase = send_erase( child, flags, hrgn, NULL, NULL );
733
734 if (!flags) break; /* nothing more to do */
735 if ((rdw_flags & RDW_NOCHILDREN) && !need_erase) break;
736 }
737 }
738
739
740 /***********************************************************************
741 * update_now
742 *
743 * Implementation of RDW_UPDATENOW behavior.
744 *
745 * FIXME: Windows uses WM_SYNCPAINT to cut down the number of intertask
746 * SendMessage() calls. This is a comment inside DefWindowProc() source
747 * from 16-bit SDK:
748 *
749 * This message avoids lots of inter-app message traffic
750 * by switching to the other task and continuing the
751 * recursion there.
752 *
753 * wParam = flags
754 * LOWORD(lParam) = hrgnClip
755 * HIWORD(lParam) = hwndSkip (not used; always NULL)
756 *
757 */
758 static void update_now( HWND hwnd, UINT rdw_flags )
759 {
760 HWND child = 0;
761
762 /* desktop window never gets WM_PAINT, only WM_ERASEBKGND */
763 if (hwnd == GetDesktopWindow()) erase_now( hwnd, rdw_flags | RDW_NOCHILDREN );
764
765 /* loop while we find a child to repaint */
766 for (;;)
767 {
768 UINT flags = UPDATE_PAINT | UPDATE_INTERNALPAINT;
769
770 if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
771 else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
772
773 if (!get_update_flags( hwnd, &child, &flags )) break;
774 if (!flags) break; /* nothing more to do */
775
776 SendMessageW( child, WM_PAINT, 0, 0 );
777 if (rdw_flags & RDW_NOCHILDREN) break;
778 }
779 }
780
781
782 /*************************************************************************
783 * fix_caret
784 *
785 * Helper for ScrollWindowEx:
786 * If the return value is 0, no special caret handling is necessary.
787 * Otherwise the return value is the handle of the window that owns the
788 * caret. Its caret needs to be hidden during the scroll operation and
789 * moved to new_caret_pos if move_caret is TRUE.
790 */
791 static HWND fix_caret(HWND hWnd, const RECT *scroll_rect, INT dx, INT dy,
792 UINT flags, LPBOOL move_caret, LPPOINT new_caret_pos)
793 {
794 GUITHREADINFO info;
795 RECT rect, mapped_rcCaret;
796 BOOL hide_caret = FALSE;
797
798 if (!GetGUIThreadInfo( GetCurrentThreadId(), &info )) return 0;
799 if (!info.hwndCaret) return 0;
800
801 if (info.hwndCaret == hWnd)
802 {
803 /* Move the caret if it's (partially) in the source rectangle */
804 if (IntersectRect(&rect, scroll_rect, &info.rcCaret))
805 {
806 *move_caret = TRUE;
807 hide_caret = TRUE;
808 new_caret_pos->x = info.rcCaret.left + dx;
809 new_caret_pos->y = info.rcCaret.top + dy;
810 }
811 else
812 {
813 *move_caret = FALSE;
814
815 /* Hide the caret if it's in the destination rectangle */
816 rect = *scroll_rect;
817 OffsetRect(&rect, dx, dy);
818 hide_caret = IntersectRect(&rect, &rect, &info.rcCaret);
819 }
820 }
821 else
822 {
823 if ((flags & SW_SCROLLCHILDREN) && IsChild(hWnd, info.hwndCaret))
824 {
825 *move_caret = FALSE;
826
827 /* Hide the caret if it's in the source or in the destination
828 rectangle */
829 mapped_rcCaret = info.rcCaret;
830 MapWindowPoints(info.hwndCaret, hWnd, (LPPOINT)&mapped_rcCaret, 2);
831
832 if (IntersectRect(&rect, scroll_rect, &mapped_rcCaret))
833 {
834 hide_caret = TRUE;
835 }
836 else
837 {
838 rect = *scroll_rect;
839 OffsetRect(&rect, dx, dy);
840 hide_caret = IntersectRect(&rect, &rect, &mapped_rcCaret);
841 }
842 }
843 else
844 return 0;
845 }
846
847 if (hide_caret)
848 {
849 HideCaret(info.hwndCaret);
850 return info.hwndCaret;
851 }
852 else
853 return 0;
854 }
855
856
857 /***********************************************************************
858 * BeginPaint (USER32.@)
859 */
860 HDC WINAPI BeginPaint( HWND hwnd, PAINTSTRUCT *lps )
861 {
862 HRGN hrgn;
863 UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE | UPDATE_PAINT | UPDATE_INTERNALPAINT | UPDATE_NOCHILDREN;
864
865 if (!lps) return 0;
866
867 HideCaret( hwnd );
868
869 if (!(hrgn = send_ncpaint( hwnd, NULL, &flags ))) return 0;
870
871 lps->fErase = send_erase( hwnd, flags, hrgn, &lps->rcPaint, &lps->hdc );
872
873 TRACE("hdc = %p box = (%s), fErase = %d\n",
874 lps->hdc, wine_dbgstr_rect(&lps->rcPaint), lps->fErase);
875
876 return lps->hdc;
877 }
878
879
880 /***********************************************************************
881 * EndPaint (USER32.@)
882 */
883 BOOL WINAPI EndPaint( HWND hwnd, const PAINTSTRUCT *lps )
884 {
885 if (!lps) return FALSE;
886 release_dc( hwnd, lps->hdc, TRUE );
887 ShowCaret( hwnd );
888 return TRUE;
889 }
890
891
892 /***********************************************************************
893 * GetDCEx (USER32.@)
894 */
895 HDC WINAPI GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags )
896 {
897 static const DWORD clip_flags = DCX_PARENTCLIP | DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | DCX_WINDOW;
898 struct dce *dce;
899 BOOL bUpdateVisRgn = TRUE;
900 HWND parent;
901 LONG window_style = GetWindowLongW( hwnd, GWL_STYLE );
902
903 if (!hwnd) hwnd = GetDesktopWindow();
904 else hwnd = WIN_GetFullHandle( hwnd );
905
906 TRACE("hwnd %p, hrgnClip %p, flags %08x\n", hwnd, hrgnClip, flags);
907
908 /* fixup flags */
909
910 if (flags & (DCX_WINDOW | DCX_PARENTCLIP)) flags |= DCX_CACHE;
911
912 if (flags & DCX_USESTYLE)
913 {
914 flags &= ~(DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP);
915
916 if (window_style & WS_CLIPSIBLINGS) flags |= DCX_CLIPSIBLINGS;
917
918 if (!(flags & DCX_WINDOW))
919 {
920 if (GetClassLongW( hwnd, GCL_STYLE ) & CS_PARENTDC) flags |= DCX_PARENTCLIP;
921
922 if (window_style & WS_CLIPCHILDREN && !(window_style & WS_MINIMIZE))
923 flags |= DCX_CLIPCHILDREN;
924 }
925 }
926
927 if (flags & DCX_WINDOW) flags &= ~DCX_CLIPCHILDREN;
928
929 parent = GetAncestor( hwnd, GA_PARENT );
930 if (!parent || (parent == GetDesktopWindow()))
931 flags = (flags & ~DCX_PARENTCLIP) | DCX_CLIPSIBLINGS;
932
933 /* it seems parent clip is ignored when clipping siblings or children */
934 if (flags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN)) flags &= ~DCX_PARENTCLIP;
935
936 if( flags & DCX_PARENTCLIP )
937 {
938 LONG parent_style = GetWindowLongW( parent, GWL_STYLE );
939 if( (window_style & WS_VISIBLE) && (parent_style & WS_VISIBLE) )
940 {
941 flags &= ~DCX_CLIPCHILDREN;
942 if (parent_style & WS_CLIPSIBLINGS) flags |= DCX_CLIPSIBLINGS;
943 }
944 }
945
946 /* find a suitable DCE */
947
948 if ((flags & DCX_CACHE) || !(dce = get_window_dce( hwnd )))
949 {
950 struct dce *dceEmpty = NULL, *dceUnused = NULL;
951
952 /* Strategy: First, we attempt to find a non-empty but unused DCE with
953 * compatible flags. Next, we look for an empty entry. If the cache is
954 * full we have to purge one of the unused entries.
955 */
956 USER_Lock();
957 LIST_FOR_EACH_ENTRY( dce, &dce_list, struct dce, entry )
958 {
959 if ((dce->flags & DCX_CACHE) && !dce->count)
960 {
961 dceUnused = dce;
962
963 if (!dce->hwnd) dceEmpty = dce;
964 else if ((dce->hwnd == hwnd) && !((dce->flags ^ flags) & clip_flags))
965 {
966 TRACE("\tfound valid %p dce [%p], flags %08x\n",
967 dce, hwnd, dce->flags );
968 bUpdateVisRgn = FALSE;
969 break;
970 }
971 }
972 }
973
974 if (&dce->entry == &dce_list) /* nothing found */
975 dce = dceEmpty ? dceEmpty : dceUnused;
976
977 if (dce) dce->count = 1;
978
979 USER_Unlock();
980
981 /* if there's no dce empty or unused, allocate a new one */
982 if (!dce)
983 {
984 if (!(dce = alloc_dce())) return 0;
985 dce->flags = DCX_CACHE;
986 USER_Lock();
987 list_add_head( &dce_list, &dce->entry );
988 USER_Unlock();
989 }
990 }
991 else
992 {
993 flags |= DCX_NORESETATTRS;
994 if (dce->hwnd == hwnd)
995 {
996 TRACE("\tskipping hVisRgn update\n");
997 bUpdateVisRgn = FALSE; /* updated automatically, via DCHook() */
998 }
999 else
1000 {
1001 /* we should free dce->clip_rgn here, but Windows apparently doesn't */
1002 dce->flags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN);
1003 dce->clip_rgn = 0;
1004 }
1005 }
1006
1007 if (flags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN))
1008 {
1009 /* if the extra clip region has changed, get rid of the old one */
1010 if (dce->clip_rgn != hrgnClip || ((flags ^ dce->flags) & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)))
1011 delete_clip_rgn( dce );
1012 dce->clip_rgn = hrgnClip;
1013 if (!dce->clip_rgn) dce->clip_rgn = CreateRectRgn( 0, 0, 0, 0 );
1014 dce->flags |= flags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN);
1015 bUpdateVisRgn = TRUE;
1016 }
1017
1018 dce->hwnd = hwnd;
1019 dce->flags = (dce->flags & ~clip_flags) | (flags & clip_flags);
1020
1021 if (SetHookFlags( dce->hdc, DCHF_VALIDATEVISRGN )) bUpdateVisRgn = TRUE; /* DC was dirty */
1022
1023 if (bUpdateVisRgn) update_visible_region( dce );
1024
1025 if (!(flags & DCX_NORESETATTRS))
1026 {
1027 RestoreDC( dce->hdc, 1 ); /* initial save level is always 1 */
1028 SaveDC( dce->hdc ); /* save the state again for next time */
1029 }
1030
1031 TRACE("(%p,%p,0x%x): returning %p\n", hwnd, hrgnClip, flags, dce->hdc);
1032 return dce->hdc;
1033 }
1034
1035
1036 /***********************************************************************
1037 * GetDC (USER32.@)
1038 *
1039 * Get a device context.
1040 *
1041 * RETURNS
1042 * Success: Handle to the device context
1043 * Failure: NULL.
1044 */
1045 HDC WINAPI GetDC( HWND hwnd )
1046 {
1047 if (!hwnd) return GetDCEx( 0, 0, DCX_CACHE | DCX_WINDOW );
1048 return GetDCEx( hwnd, 0, DCX_USESTYLE );
1049 }
1050
1051
1052 /***********************************************************************
1053 * GetWindowDC (USER32.@)
1054 */
1055 HDC WINAPI GetWindowDC( HWND hwnd )
1056 {
1057 return GetDCEx( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
1058 }
1059
1060
1061 /***********************************************************************
1062 * ReleaseDC (USER32.@)
1063 *
1064 * Release a device context.
1065 *
1066 * RETURNS
1067 * Success: Non-zero. Resources used by hdc are released.
1068 * Failure: 0.
1069 */
1070 INT WINAPI ReleaseDC( HWND hwnd, HDC hdc )
1071 {
1072 return release_dc( hwnd, hdc, FALSE );
1073 }
1074
1075
1076 /**********************************************************************
1077 * WindowFromDC (USER32.@)
1078 */
1079 HWND WINAPI WindowFromDC( HDC hdc )
1080 {
1081 struct dce *dce;
1082 HWND hwnd = 0;
1083
1084 USER_Lock();
1085 dce = (struct dce *)GetDCHook( hdc, NULL );
1086 if (dce) hwnd = dce->hwnd;
1087 USER_Unlock();
1088 return hwnd;
1089 }
1090
1091
1092 /***********************************************************************
1093 * LockWindowUpdate (USER32.@)
1094 *
1095 * Enables or disables painting in the chosen window.
1096 *
1097 * PARAMS
1098 * hwnd [I] handle to a window.
1099 *
1100 * RETURNS
1101 * If successful, returns nonzero value. Otherwise,
1102 * returns 0.
1103 *
1104 * NOTES
1105 * You can lock only one window at a time.
1106 */
1107 BOOL WINAPI LockWindowUpdate( HWND hwnd )
1108 {
1109 static HWND lockedWnd;
1110
1111 /* This function is fully implemented by the following patch:
1112 *
1113 * http://www.winehq.org/hypermail/wine-patches/2004/01/0142.html
1114 *
1115 * but in order to work properly, it needs the ability to invalidate
1116 * DCEs in other processes when the lock window is changed, which
1117 * isn't possible yet.
1118 * -mike
1119 */
1120
1121 FIXME("(%p), partial stub!\n",hwnd);
1122
1123 USER_Lock();
1124 if (lockedWnd)
1125 {
1126 if (!hwnd)
1127 {
1128 /* Unlock lockedWnd */
1129 /* FIXME: Do something */
1130 }
1131 else
1132 {
1133 /* Attempted to lock a second window */
1134 /* Return FALSE and do nothing */
1135 USER_Unlock();
1136 return FALSE;
1137 }
1138 }
1139 lockedWnd = hwnd;
1140 USER_Unlock();
1141 return TRUE;
1142 }
1143
1144
1145 /***********************************************************************
1146 * RedrawWindow (USER32.@)
1147 */
1148 BOOL WINAPI RedrawWindow( HWND hwnd, const RECT *rect, HRGN hrgn, UINT flags )
1149 {
1150 static const RECT empty;
1151 BOOL ret;
1152
1153 if (!hwnd) hwnd = GetDesktopWindow();
1154
1155 if (TRACE_ON(win))
1156 {
1157 if (hrgn)
1158 {
1159 RECT r;
1160 GetRgnBox( hrgn, &r );
1161 TRACE( "%p region %p box %s ", hwnd, hrgn, wine_dbgstr_rect(&r) );
1162 }
1163 else if (rect)
1164 TRACE( "%p rect %s ", hwnd, wine_dbgstr_rect(rect) );
1165 else
1166 TRACE( "%p whole window ", hwnd );
1167
1168 dump_rdw_flags(flags);
1169 }
1170
1171 /* process pending expose events before painting */
1172 if (flags & RDW_UPDATENOW) USER_Driver->pMsgWaitForMultipleObjectsEx( 0, NULL, 0, QS_PAINT, 0 );
1173
1174 if (rect && !hrgn)
1175 {
1176 if (IsRectEmpty( rect )) rect = ∅
1177 ret = redraw_window_rects( hwnd, flags, rect, 1 );
1178 }
1179 else if (!hrgn)
1180 {
1181 ret = redraw_window_rects( hwnd, flags, NULL, 0 );
1182 }
1183 else /* need to build a list of the region rectangles */
1184 {
1185 DWORD size;
1186 RGNDATA *data = NULL;
1187
1188 if (!(size = GetRegionData( hrgn, 0, NULL ))) return FALSE;
1189 if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return FALSE;
1190 GetRegionData( hrgn, size, data );
1191 if (!data->rdh.nCount) /* empty region -> use a single all-zero rectangle */
1192 ret = redraw_window_rects( hwnd, flags, &empty, 1 );
1193 else
1194 ret = redraw_window_rects( hwnd, flags, (const RECT *)data->Buffer, data->rdh.nCount );
1195 HeapFree( GetProcessHeap(), 0, data );
1196 }
1197
1198 if (flags & RDW_UPDATENOW) update_now( hwnd, flags );
1199 else if (flags & RDW_ERASENOW) erase_now( hwnd, flags );
1200
1201 return ret;
1202 }
1203
1204
1205 /***********************************************************************
1206 * UpdateWindow (USER32.@)
1207 */
1208 BOOL WINAPI UpdateWindow( HWND hwnd )
1209 {
1210 return RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_ALLCHILDREN );
1211 }
1212
1213
1214 /***********************************************************************
1215 * InvalidateRgn (USER32.@)
1216 */
1217 BOOL WINAPI InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1218 {
1219 if (!hwnd)
1220 {
1221 SetLastError( ERROR_INVALID_WINDOW_HANDLE );
1222 return FALSE;
1223 }
1224
1225 return RedrawWindow(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
1226 }
1227
1228
1229 /***********************************************************************
1230 * InvalidateRect (USER32.@)
1231 *
1232 * MSDN: if hwnd parameter is NULL, InvalidateRect invalidates and redraws
1233 * all windows and sends WM_ERASEBKGND and WM_NCPAINT.
1234 */
1235 BOOL WINAPI InvalidateRect( HWND hwnd, const RECT *rect, BOOL erase )
1236 {
1237 UINT flags = RDW_INVALIDATE | (erase ? RDW_ERASE : 0);
1238
1239 if (!hwnd)
1240 {
1241 flags = RDW_ALLCHILDREN | RDW_INVALIDATE | RDW_FRAME | RDW_ERASE | RDW_ERASENOW;
1242 rect = NULL;
1243 }
1244
1245 return RedrawWindow( hwnd, rect, 0, flags );
1246 }
1247
1248
1249 /***********************************************************************
1250 * ValidateRgn (USER32.@)
1251 */
1252 BOOL WINAPI ValidateRgn( HWND hwnd, HRGN hrgn )
1253 {
1254 if (!hwnd)
1255 {
1256 SetLastError( ERROR_INVALID_WINDOW_HANDLE );
1257 return FALSE;
1258 }
1259
1260 return RedrawWindow( hwnd, NULL, hrgn, RDW_VALIDATE );
1261 }
1262
1263
1264 /***********************************************************************
1265 * ValidateRect (USER32.@)
1266 *
1267 * MSDN: if hwnd parameter is NULL, ValidateRect invalidates and redraws
1268 * all windows and sends WM_ERASEBKGND and WM_NCPAINT.
1269 */
1270 BOOL WINAPI ValidateRect( HWND hwnd, const RECT *rect )
1271 {
1272 UINT flags = RDW_VALIDATE;
1273
1274 if (!hwnd)
1275 {
1276 flags = RDW_ALLCHILDREN | RDW_INVALIDATE | RDW_FRAME | RDW_ERASE | RDW_ERASENOW;
1277 rect = NULL;
1278 }
1279
1280 return RedrawWindow( hwnd, rect, 0, flags );
1281 }
1282
1283
1284 /***********************************************************************
1285 * GetUpdateRgn (USER32.@)
1286 */
1287 INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1288 {
1289 INT retval = ERROR;
1290 UINT flags = UPDATE_NOCHILDREN;
1291 HRGN update_rgn;
1292
1293 if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
1294
1295 if ((update_rgn = send_ncpaint( hwnd, NULL, &flags )))
1296 {
1297 POINT offset;
1298
1299 retval = CombineRgn( hrgn, update_rgn, 0, RGN_COPY );
1300 if (send_erase( hwnd, flags, update_rgn, NULL, NULL ))
1301 {
1302 flags = UPDATE_DELAYED_ERASE;
1303 get_update_flags( hwnd, NULL, &flags );
1304 }
1305 /* map region to client coordinates */
1306 offset.x = offset.y = 0;
1307 ScreenToClient( hwnd, &offset );
1308 OffsetRgn( hrgn, offset.x, offset.y );
1309 }
1310 return retval;
1311 }
1312
1313
1314 /***********************************************************************
1315 * GetUpdateRect (USER32.@)
1316 */
1317 BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
1318 {
1319 UINT flags = UPDATE_NOCHILDREN;
1320 HRGN update_rgn;
1321 BOOL need_erase;
1322
1323 if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
1324
1325 if (!(update_rgn = send_ncpaint( hwnd, NULL, &flags ))) return FALSE;
1326
1327 if (rect)
1328 {
1329 if (GetRgnBox( update_rgn, rect ) != NULLREGION)
1330 {
1331 HDC hdc = GetDCEx( hwnd, 0, DCX_USESTYLE );
1332 MapWindowPoints( 0, hwnd, (LPPOINT)rect, 2 );
1333 DPtoLP( hdc, (LPPOINT)rect, 2 );
1334 ReleaseDC( hwnd, hdc );
1335 }
1336 }
1337 need_erase = send_erase( hwnd, flags, update_rgn, NULL, NULL );
1338
1339 /* check if we still have an update region */
1340 flags = UPDATE_PAINT | UPDATE_NOCHILDREN;
1341 if (need_erase) flags |= UPDATE_DELAYED_ERASE;
1342 return (get_update_flags( hwnd, NULL, &flags ) && (flags & UPDATE_PAINT));
1343 }
1344
1345
1346 /***********************************************************************
1347 * ExcludeUpdateRgn (USER32.@)
1348 */
1349 INT WINAPI ExcludeUpdateRgn( HDC hdc, HWND hwnd )
1350 {
1351 HRGN update_rgn = CreateRectRgn( 0, 0, 0, 0 );
1352 INT ret = GetUpdateRgn( hwnd, update_rgn, FALSE );
1353
1354 if (ret != ERROR)
1355 {
1356 POINT pt;
1357
1358 GetDCOrgEx( hdc, &pt );
1359 MapWindowPoints( 0, hwnd, &pt, 1 );
1360 OffsetRgn( update_rgn, -pt.x, -pt.y );
1361 ret = ExtSelectClipRgn( hdc, update_rgn, RGN_DIFF );
1362 DeleteObject( update_rgn );
1363 }
1364 return ret;
1365 }
1366
1367
1368 /*************************************************************************
1369 * ScrollWindowEx (USER32.@)
1370 *
1371 * Note: contrary to what the doc says, pixels that are scrolled from the
1372 * outside of clipRect to the inside are NOT painted.
1373 *
1374 */
1375 INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
1376 const RECT *rect, const RECT *clipRect,
1377 HRGN hrgnUpdate, LPRECT rcUpdate,
1378 UINT flags )
1379 {
1380 INT retVal = NULLREGION;
1381 BOOL bOwnRgn = TRUE;
1382 BOOL bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
1383 int rdw_flags;
1384 HRGN hrgnTemp;
1385 HRGN hrgnWinupd = 0;
1386 HDC hDC;
1387 RECT rc, cliprc;
1388 HWND hwndCaret = NULL;
1389 BOOL moveCaret = FALSE;
1390 POINT newCaretPos;
1391
1392 TRACE( "%p, %d,%d hrgnUpdate=%p rcUpdate = %p %s %04x\n",
1393 hwnd, dx, dy, hrgnUpdate, rcUpdate, wine_dbgstr_rect(rect), flags );
1394 TRACE( "clipRect = %s\n", wine_dbgstr_rect(clipRect));
1395 if( flags & ~( SW_SCROLLCHILDREN | SW_INVALIDATE | SW_ERASE))
1396 FIXME("some flags (%04x) are unhandled\n", flags);
1397
1398 rdw_flags = (flags & SW_ERASE) && (flags & SW_INVALIDATE) ?
1399 RDW_INVALIDATE | RDW_ERASE : RDW_INVALIDATE ;
1400
1401 if (!WIN_IsWindowDrawable( hwnd, TRUE )) return ERROR;
1402 hwnd = WIN_GetFullHandle( hwnd );
1403
1404 GetClientRect(hwnd, &rc);
1405 if (rect) IntersectRect(&rc, &rc, rect);
1406
1407 if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
1408 else cliprc = rc;
1409
1410 if( hrgnUpdate ) bOwnRgn = FALSE;
1411 else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
1412
1413 newCaretPos.x = newCaretPos.y = 0;
1414
1415 if( !IsRectEmpty(&cliprc) && (dx || dy)) {
1416 DWORD dcxflags = DCX_CACHE;
1417 DWORD style = GetWindowLongW( hwnd, GWL_STYLE );
1418
1419 hwndCaret = fix_caret(hwnd, &rc, dx, dy, flags, &moveCaret, &newCaretPos);
1420
1421 if( style & WS_CLIPSIBLINGS) dcxflags |= DCX_CLIPSIBLINGS;
1422 if( GetClassLongW( hwnd, GCL_STYLE ) & CS_PARENTDC)
1423 dcxflags |= DCX_PARENTCLIP;
1424 if( !(flags & SW_SCROLLCHILDREN) && (style & WS_CLIPCHILDREN))
1425 dcxflags |= DCX_CLIPCHILDREN;
1426 hDC = GetDCEx( hwnd, 0, dcxflags);
1427 if (hDC)
1428 {
1429 ScrollDC( hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate );
1430
1431 ReleaseDC( hwnd, hDC );
1432
1433 if (!bUpdate)
1434 RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags);
1435 }
1436
1437 /* If the windows has an update region, this must be
1438 * scrolled as well. Keep a copy in hrgnWinupd
1439 * to be added to hrngUpdate at the end. */
1440 hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
1441 retVal = GetUpdateRgn( hwnd, hrgnTemp, FALSE );
1442 if (retVal != NULLREGION)
1443 {
1444 HRGN hrgnClip = CreateRectRgnIndirect(&cliprc);
1445 if( !bOwnRgn) {
1446 hrgnWinupd = CreateRectRgn( 0, 0, 0, 0);
1447 CombineRgn( hrgnWinupd, hrgnTemp, 0, RGN_COPY);
1448 }
1449 OffsetRgn( hrgnTemp, dx, dy );
1450 CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
1451 if( !bOwnRgn)
1452 CombineRgn( hrgnWinupd, hrgnWinupd, hrgnTemp, RGN_OR );
1453 RedrawWindow( hwnd, NULL, hrgnTemp, rdw_flags);
1454
1455 /* Catch the case where the scrolling amount exceeds the size of the
1456 * original window. This generated a second update area that is the
1457 * location where the original scrolled content would end up.
1458 * This second region is not returned by the ScrollDC and sets
1459 * ScrollWindowEx apart from just a ScrollDC.
1460 *
1461 * This has been verified with testing on windows.
1462 */
1463 if (abs(dx) > abs(rc.right - rc.left) ||
1464 abs(dy) > abs(rc.bottom - rc.top))
1465 {
1466 SetRectRgn( hrgnTemp, rc.left + dx, rc.top + dy, rc.right+dx, rc.bottom + dy);
1467 CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
1468 CombineRgn( hrgnUpdate, hrgnUpdate, hrgnTemp, RGN_OR );
1469
1470 if( !bOwnRgn)
1471 CombineRgn( hrgnWinupd, hrgnWinupd, hrgnTemp, RGN_OR );
1472 }
1473 DeleteObject( hrgnClip );
1474 }
1475 DeleteObject( hrgnTemp );
1476 } else {
1477 /* nothing was scrolled */
1478 if( !bOwnRgn)
1479 SetRectRgn( hrgnUpdate, 0, 0, 0, 0 );
1480 SetRectEmpty( rcUpdate);
1481 }
1482
1483 if( flags & SW_SCROLLCHILDREN )
1484 {
1485 HWND *list = WIN_ListChildren( hwnd );
1486 if (list)
1487 {
1488 int i;
1489 RECT r, dummy;
1490 for (i = 0; list[i]; i++)
1491 {
1492 GetWindowRect( list[i], &r );
1493 MapWindowPoints( 0, hwnd, (POINT *)&r, 2 );
1494 if (!rect || IntersectRect(&dummy, &r, rect))
1495 SetWindowPos( list[i], 0, r.left + dx, r.top + dy, 0, 0,
1496 SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
1497 SWP_NOREDRAW | SWP_DEFERERASE );
1498 }
1499 HeapFree( GetProcessHeap(), 0, list );
1500 }
1501 }
1502
1503 if( flags & (SW_INVALIDATE | SW_ERASE) )
1504 RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags |
1505 ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
1506
1507 if( hrgnWinupd) {
1508 CombineRgn( hrgnUpdate, hrgnUpdate, hrgnWinupd, RGN_OR);
1509 DeleteObject( hrgnWinupd);
1510 }
1511
1512 if( hwndCaret ) {
1513 if ( moveCaret ) SetCaretPos( newCaretPos.x, newCaretPos.y );
1514 ShowCaret(hwndCaret);
1515 }
1516
1517 if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
1518
1519 return retVal;
1520 }
1521
1522
1523 /*************************************************************************
1524 * ScrollWindow (USER32.@)
1525 *
1526 */
1527 BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
1528 const RECT *rect, const RECT *clipRect )
1529 {
1530 return (ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
1531 (rect ? 0 : SW_SCROLLCHILDREN) |
1532 SW_INVALIDATE | SW_ERASE ));
1533 }
1534
1535
1536 /*************************************************************************
1537 * ScrollDC (USER32.@)
1538 *
1539 * dx, dy, lprcScroll and lprcClip are all in logical coordinates (msdn is
1540 * wrong) hrgnUpdate is returned in device coordinates with rcUpdate in
1541 * logical coordinates.
1542 */
1543 BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
1544 const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
1545
1546 {
1547 return USER_Driver->pScrollDC( hdc, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate );
1548 }
1549
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