dlls/user/painting.c

   1 /*
   2  * Window painting functions
   3  *
   4  * Copyright 1993, 1994, 1995, 2001, 2004 Alexandre Julliard
   5  * Copyright 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <stdarg.h>
  26 #include <string.h>
  27
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "wingdi.h"
  31 #include "ntstatus.h"
  32 #include "winuser.h"
  33 #include "wine/server.h"
  34 #include "win.h"
  35 #include "user_private.h"
  36 #include "wine/debug.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(win);
  39
  40
  41 /***********************************************************************
  42  *           dump_rdw_flags
  43  */
  44 static void dump_rdw_flags(UINT flags)
  45 {
  46     TRACE("flags:");
  47     if (flags & RDW_INVALIDATE) TRACE(" RDW_INVALIDATE");
  48     if (flags & RDW_INTERNALPAINT) TRACE(" RDW_INTERNALPAINT");
  49     if (flags & RDW_ERASE) TRACE(" RDW_ERASE");
  50     if (flags & RDW_VALIDATE) TRACE(" RDW_VALIDATE");
  51     if (flags & RDW_NOINTERNALPAINT) TRACE(" RDW_NOINTERNALPAINT");
  52     if (flags & RDW_NOERASE) TRACE(" RDW_NOERASE");
  53     if (flags & RDW_NOCHILDREN) TRACE(" RDW_NOCHILDREN");
  54     if (flags & RDW_ALLCHILDREN) TRACE(" RDW_ALLCHILDREN");
  55     if (flags & RDW_UPDATENOW) TRACE(" RDW_UPDATENOW");
  56     if (flags & RDW_ERASENOW) TRACE(" RDW_ERASENOW");
  57     if (flags & RDW_FRAME) TRACE(" RDW_FRAME");
  58     if (flags & RDW_NOFRAME) TRACE(" RDW_NOFRAME");
  59
  60 #define RDW_FLAGS \
  61     (RDW_INVALIDATE | \
  62     RDW_INTERNALPAINT | \
  63     RDW_ERASE | \
  64     RDW_VALIDATE | \
  65     RDW_NOINTERNALPAINT | \
  66     RDW_NOERASE | \
  67     RDW_NOCHILDREN | \
  68     RDW_ALLCHILDREN | \
  69     RDW_UPDATENOW | \
  70     RDW_ERASENOW | \
  71     RDW_FRAME | \
  72     RDW_NOFRAME)
  73
  74     if (flags & ~RDW_FLAGS) TRACE(" %04x", flags & ~RDW_FLAGS);
  75     TRACE("\n");
  76 #undef RDW_FLAGS
  77 }
  78
  79
  80 /***********************************************************************
  81  *           get_update_region
  82  *
  83  * Return update region (in screen coordinates) for a window.
  84  */
  85 static HRGN get_update_region( HWND hwnd, UINT *flags, HWND *child )
  86 {
  87     HRGN hrgn = 0;
  88     NTSTATUS status;
  89     RGNDATA *data;
  90     size_t size = 256;
  91
  92     do
  93     {
  94         if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data) + size - 1 )))
  95         {
  96             SetLastError( ERROR_OUTOFMEMORY );
  97             return 0;
  98         }
  99
 100         SERVER_START_REQ( get_update_region )
 101         {
 102             req->window = hwnd;
 103             req->flags  = *flags;
 104             wine_server_set_reply( req, data->Buffer, size );
 105             if (!(status = wine_server_call( req )))
 106             {
 107                 size_t reply_size = wine_server_reply_size( reply );
 108                 data->rdh.dwSize   = sizeof(data->rdh);
 109                 data->rdh.iType    = RDH_RECTANGLES;
 110                 data->rdh.nCount   = reply_size / sizeof(RECT);
 111                 data->rdh.nRgnSize = reply_size;
 112                 hrgn = ExtCreateRegion( NULL, size, data );
 113                 if (child) *child = reply->child;
 114                 *flags = reply->flags;
 115             }
 116             else size = reply->total_size;
 117         }
 118         SERVER_END_REQ;
 119         HeapFree( GetProcessHeap(), 0, data );
 120     } while (status == STATUS_BUFFER_OVERFLOW);
 121
 122     if (status) SetLastError( RtlNtStatusToDosError(status) );
 123     return hrgn;
 124 }
 125
 126
 127 /***********************************************************************
 128  *           get_update_flags
 129  *
 130  * Get only the update flags, not the update region.
 131  */
 132 static BOOL get_update_flags( HWND hwnd, HWND *child, UINT *flags )
 133 {
 134     BOOL ret;
 135
 136     SERVER_START_REQ( get_update_region )
 137     {
 138         req->window = hwnd;
 139         req->flags  = *flags | UPDATE_NOREGION;
 140         if ((ret = !wine_server_call_err( req )))
 141         {
 142             if (child) *child = reply->child;
 143             *flags = reply->flags;
 144         }
 145     }
 146     SERVER_END_REQ;
 147     return ret;
 148 }
 149
 150
 151 /***********************************************************************
 152  *           redraw_window_rects
 153  *
 154  * Redraw part of a window.
 155  */
 156 static BOOL redraw_window_rects( HWND hwnd, UINT flags, const RECT *rects, UINT count )
 157 {
 158     BOOL ret;
 159
 160     SERVER_START_REQ( redraw_window )
 161     {
 162         req->window = hwnd;
 163         req->flags  = flags;
 164         wine_server_add_data( req, rects, count * sizeof(RECT) );
 165         ret = !wine_server_call_err( req );
 166     }
 167     SERVER_END_REQ;
 168     return ret;
 169 }
 170
 171
 172 /***********************************************************************
 173  *           send_ncpaint
 174  *
 175  * Send a WM_NCPAINT message if needed, and return the resulting update region (in screen coords).
 176  * Helper for erase_now and BeginPaint.
 177  */
 178 static HRGN send_ncpaint( HWND hwnd, HWND *child, UINT *flags )
 179 {
 180     HRGN whole_rgn = get_update_region( hwnd, flags, child );
 181     HRGN client_rgn = 0;
 182
 183     if (child) hwnd = *child;
 184
 185     if (whole_rgn)
 186     {
 187         RECT client, update;
 188         INT type;
 189
 190         /* check if update rgn overlaps with nonclient area */
 191         type = GetRgnBox( whole_rgn, &update );
 192         GetClientRect( hwnd, &client );
 193         MapWindowPoints( hwnd, 0, (POINT *)&client, 2 );
 194
 195         if ((*flags & UPDATE_NONCLIENT) ||
 196             update.left < client.left || update.top < client.top ||
 197             update.right > client.right || update.bottom > client.bottom)
 198         {
 199             client_rgn = CreateRectRgnIndirect( &client );
 200             CombineRgn( client_rgn, client_rgn, whole_rgn, RGN_AND );
 201
 202             /* check if update rgn contains complete nonclient area */
 203             if (type == SIMPLEREGION)
 204             {
 205                 RECT window;
 206                 GetWindowRect( hwnd, &window );
 207                 if (EqualRect( &window, &update ))
 208                 {
 209                     DeleteObject( whole_rgn );
 210                     whole_rgn = (HRGN)1;
 211                 }
 212             }
 213         }
 214         else
 215         {
 216             client_rgn = whole_rgn;
 217             whole_rgn = 0;
 218         }
 219
 220         if (whole_rgn) /* NOTE: WM_NCPAINT allows wParam to be 1 */
 221         {
 222             if (*flags & UPDATE_NONCLIENT) SendMessageW( hwnd, WM_NCPAINT, (WPARAM)whole_rgn, 0 );
 223             if (whole_rgn > (HRGN)1) DeleteObject( whole_rgn );
 224         }
 225     }
 226     return client_rgn;
 227 }
 228
 229
 230 /***********************************************************************
 231  *           send_erase
 232  *
 233  * Send a WM_ERASEBKGND message if needed, and optionally return the DC for painting.
 234  * If a DC is requested, the region is selected into it. In all cases the region is deleted.
 235  * Helper for erase_now and BeginPaint.
 236  */
 237 static BOOL send_erase( HWND hwnd, UINT flags, HRGN client_rgn,
 238                         RECT *clip_rect, HDC *hdc_ret )
 239 {
 240     BOOL need_erase = FALSE;
 241     HDC hdc = 0;
 242     RECT dummy;
 243
 244     if (!clip_rect) clip_rect = &dummy;
 245     if (hdc_ret || (flags & UPDATE_ERASE))
 246     {
 247         UINT dcx_flags = DCX_INTERSECTRGN | DCX_USESTYLE;
 248         if (IsIconic(hwnd)) dcx_flags |= DCX_WINDOW;
 249
 250         if ((hdc = GetDCEx( hwnd, client_rgn, dcx_flags )))
 251         {
 252             INT type = GetClipBox( hdc, clip_rect );
 253
 254             if (flags & UPDATE_ERASE)
 255             {
 256                 /* don't erase if the clip box is empty */
 257                 if (type != NULLREGION)
 258                     need_erase = !SendMessageW( hwnd, WM_ERASEBKGND, (WPARAM)hdc, 0 );
 259             }
 260             if (!hdc_ret)
 261             {
 262                 if (need_erase && hwnd != GetDesktopWindow())  /* FIXME: mark it as needing erase again */
 263                     RedrawWindow( hwnd, clip_rect, 0, RDW_INVALIDATE | RDW_ERASE | RDW_NOCHILDREN );
 264                 ReleaseDC( hwnd, hdc );
 265             }
 266         }
 267
 268         if (hdc_ret) *hdc_ret = hdc;
 269     }
 270     if (!hdc) DeleteObject( client_rgn );
 271     return need_erase;
 272 }
 273
 274
 275 /***********************************************************************
 276  *           erase_now
 277  *
 278  * Implementation of RDW_ERASENOW behavior.
 279  */
 280 static void erase_now( HWND hwnd, UINT rdw_flags )
 281 {
 282     HWND child;
 283     HRGN hrgn;
 284
 285     /* loop while we find a child to repaint */
 286     for (;;)
 287     {
 288         UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE;
 289
 290         if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
 291         else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
 292
 293         if (!(hrgn = send_ncpaint( hwnd, &child, &flags ))) break;
 294         send_erase( child, flags, hrgn, NULL, NULL );
 295
 296         if (!flags) break;  /* nothing more to do */
 297         if (rdw_flags & RDW_NOCHILDREN) break;
 298     }
 299 }
 300
 301
 302 /***********************************************************************
 303  *           update_now
 304  *
 305  * Implementation of RDW_UPDATENOW behavior.
 306  *
 307  * FIXME: Windows uses WM_SYNCPAINT to cut down the number of intertask
 308  * SendMessage() calls. This is a comment inside DefWindowProc() source
 309  * from 16-bit SDK:
 310  *
 311  *   This message avoids lots of inter-app message traffic
 312  *   by switching to the other task and continuing the
 313  *   recursion there.
 314  *
 315  * wParam         = flags
 316  * LOWORD(lParam) = hrgnClip
 317  * HIWORD(lParam) = hwndSkip  (not used; always NULL)
 318  *
 319  */
 320 static void update_now( HWND hwnd, UINT rdw_flags )
 321 {
 322     HWND prev = 0, child;
 323
 324     /* desktop window never gets WM_PAINT, only WM_ERASEBKGND */
 325     if (hwnd == GetDesktopWindow()) erase_now( hwnd, rdw_flags | RDW_NOCHILDREN );
 326
 327     /* loop while we find a child to repaint */
 328     for (;;)
 329     {
 330         UINT flags = UPDATE_PAINT | UPDATE_INTERNALPAINT;
 331
 332         if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
 333         else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
 334
 335         if (!get_update_flags( hwnd, &child, &flags )) break;
 336         if (!flags) break;  /* nothing more to do */
 337
 338         if (child == prev)  /* same window again, didn't get repainted properly */
 339         {
 340             UINT erase_flags = UPDATE_NONCLIENT | UPDATE_ERASE | UPDATE_NOCHILDREN;
 341             HRGN hrgn;
 342
 343             TRACE( "%p not repainted properly, erasing\n", child );
 344             if ((hrgn = send_ncpaint( child, NULL, &erase_flags )))
 345                 send_erase( child, erase_flags, hrgn, NULL, NULL );
 346
 347             prev = 0;
 348         }
 349         else
 350         {
 351             prev = child;
 352             SendMessageW( child, WM_PAINT, 0, 0 );
 353         }
 354         if (rdw_flags & RDW_NOCHILDREN) break;
 355     }
 356 }
 357
 358
 359 /*************************************************************************
 360  *             fix_caret
 361  *
 362  * Helper for ScrollWindowEx.
 363  */
 364 static HWND fix_caret(HWND hWnd, LPRECT lprc, UINT flags)
 365 {
 366     GUITHREADINFO info;
 367
 368     if (!GetGUIThreadInfo( GetCurrentThreadId(), &info )) return 0;
 369     if (!info.hwndCaret) return 0;
 370     if (info.hwndCaret == hWnd ||
 371         ((flags & SW_SCROLLCHILDREN) && IsChild(hWnd, info.hwndCaret)))
 372     {
 373         POINT pt;
 374         pt.x = info.rcCaret.left;
 375         pt.y = info.rcCaret.top;
 376         MapWindowPoints( info.hwndCaret, hWnd, (LPPOINT)&info.rcCaret, 2 );
 377         if( IntersectRect(lprc, lprc, &info.rcCaret) )
 378         {
 379             HideCaret(0);
 380             lprc->left = pt.x;
 381             lprc->top = pt.y;
 382             return info.hwndCaret;
 383         }
 384     }
 385     return 0;
 386 }
 387
 388
 389 /***********************************************************************
 390  *              BeginPaint (USER32.@)
 391  */
 392 HDC WINAPI BeginPaint( HWND hwnd, PAINTSTRUCT *lps )
 393 {
 394     HWND full_handle;
 395     HRGN hrgn;
 396     UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE | UPDATE_PAINT | UPDATE_INTERNALPAINT | UPDATE_NOCHILDREN;
 397
 398     if (!lps) return 0;
 399
 400     if (!(full_handle = WIN_IsCurrentThread( hwnd )))
 401     {
 402         if (IsWindow(hwnd))
 403             FIXME( "window %p belongs to other thread\n", hwnd );
 404         return 0;
 405     }
 406     hwnd = full_handle;
 407
 408     HideCaret( hwnd );
 409
 410     if (!(hrgn = send_ncpaint( hwnd, NULL, &flags ))) return 0;
 411
 412     lps->fErase = send_erase( hwnd, flags, hrgn, &lps->rcPaint, &lps->hdc );
 413
 414     TRACE("hdc = %p box = (%ld,%ld - %ld,%ld), fErase = %d\n",
 415           lps->hdc, lps->rcPaint.left, lps->rcPaint.top, lps->rcPaint.right, lps->rcPaint.bottom,
 416           lps->fErase);
 417
 418     return lps->hdc;
 419 }
 420
 421
 422 /***********************************************************************
 423  *              EndPaint (USER32.@)
 424  */
 425 BOOL WINAPI EndPaint( HWND hwnd, const PAINTSTRUCT *lps )
 426 {
 427     if (!lps) return FALSE;
 428     if (USER_Driver.pReleaseDC) USER_Driver.pReleaseDC( hwnd, lps->hdc, TRUE );
 429     ShowCaret( hwnd );
 430     return TRUE;
 431 }
 432
 433
 434 /***********************************************************************
 435  *              GetDCEx (USER32.@)
 436  */
 437 HDC WINAPI GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags )
 438 {
 439     if (!hwnd) hwnd = GetDesktopWindow();
 440     else hwnd = WIN_GetFullHandle( hwnd );
 441
 442     if (USER_Driver.pGetDCEx) return USER_Driver.pGetDCEx( hwnd, hrgnClip, flags );
 443     return 0;
 444 }
 445
 446
 447 /***********************************************************************
 448  *              GetDC (USER32.@)
 449  *
 450  * Get a device context.
 451  *
 452  * RETURNS
 453  *      Success: Handle to the device context
 454  *      Failure: NULL.
 455  */
 456 HDC WINAPI GetDC( HWND hwnd )
 457 {
 458     if (!hwnd) return GetDCEx( 0, 0, DCX_CACHE | DCX_WINDOW );
 459     return GetDCEx( hwnd, 0, DCX_USESTYLE );
 460 }
 461
 462
 463 /***********************************************************************
 464  *              GetWindowDC (USER32.@)
 465  */
 466 HDC WINAPI GetWindowDC( HWND hwnd )
 467 {
 468     return GetDCEx( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
 469 }
 470
 471
 472 /***********************************************************************
 473  *              ReleaseDC (USER32.@)
 474  *
 475  * Release a device context.
 476  *
 477  * RETURNS
 478  *      Success: Non-zero. Resources used by hdc are released.
 479  *      Failure: 0.
 480  */
 481 INT WINAPI ReleaseDC( HWND hwnd, HDC hdc )
 482 {
 483     if (USER_Driver.pReleaseDC) return USER_Driver.pReleaseDC( hwnd, hdc, FALSE );
 484     return 0;
 485 }
 486
 487
 488 /**********************************************************************
 489  *              WindowFromDC (USER32.@)
 490  */
 491 HWND WINAPI WindowFromDC( HDC hDC )
 492 {
 493     if (USER_Driver.pWindowFromDC) return USER_Driver.pWindowFromDC( hDC );
 494     return 0;
 495 }
 496
 497
 498 /***********************************************************************
 499  *              LockWindowUpdate (USER32.@)
 500  */
 501 BOOL WINAPI LockWindowUpdate( HWND hwnd )
 502 {
 503     static HWND lockedWnd;
 504
 505     /* This function is fully implemented by the following patch:
 506      *
 507      * http://www.winehq.org/hypermail/wine-patches/2004/01/0142.html
 508      *
 509      * but in order to work properly, it needs the ability to invalidate
 510      * DCEs in other processes when the lock window is changed, which
 511      * isn't possible yet.
 512      * -mike
 513      */
 514
 515     FIXME("(%p), partial stub!\n",hwnd);
 516
 517     USER_Lock();
 518     if (lockedWnd)
 519     {
 520         if (!hwnd)
 521         {
 522             /* Unlock lockedWnd */
 523             /* FIXME: Do something */
 524         }
 525         else
 526         {
 527             /* Attempted to lock a second window */
 528             /* Return FALSE and do nothing */
 529             USER_Unlock();
 530             return FALSE;
 531         }
 532     }
 533     lockedWnd = hwnd;
 534     USER_Unlock();
 535     return TRUE;
 536 }
 537
 538
 539 /***********************************************************************
 540  *              RedrawWindow (USER32.@)
 541  */
 542 BOOL WINAPI RedrawWindow( HWND hwnd, const RECT *rect, HRGN hrgn, UINT flags )
 543 {
 544     BOOL ret;
 545
 546     if (!hwnd) hwnd = GetDesktopWindow();
 547
 548     if (TRACE_ON(win))
 549     {
 550         if (hrgn)
 551         {
 552             RECT r;
 553             GetRgnBox( hrgn, &r );
 554             TRACE( "%p region %p box %s ", hwnd, hrgn, wine_dbgstr_rect(&r) );
 555         }
 556         else if (rect)
 557             TRACE( "%p rect %s ", hwnd, wine_dbgstr_rect(rect) );
 558         else
 559             TRACE( "%p whole window ", hwnd );
 560
 561         dump_rdw_flags(flags);
 562     }
 563
 564     /* process pending expose events before painting */
 565     if (flags & RDW_UPDATENOW) MsgWaitForMultipleObjects( 0, NULL, FALSE, 0, QS_PAINT );
 566
 567     if (rect && !hrgn)
 568     {
 569         ret = redraw_window_rects( hwnd, flags, rect, 1 );
 570     }
 571     else if (!hrgn)
 572     {
 573         ret = redraw_window_rects( hwnd, flags, NULL, 0 );
 574     }
 575     else  /* need to build a list of the region rectangles */
 576     {
 577         DWORD size;
 578         RGNDATA *data = NULL;
 579         static const RECT empty;
 580
 581         if (!(size = GetRegionData( hrgn, 0, NULL ))) return FALSE;
 582         if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return FALSE;
 583         GetRegionData( hrgn, size, data );
 584         if (!data->rdh.nCount)  /* empty region -> use a single all-zero rectangle */
 585             ret = redraw_window_rects( hwnd, flags, &empty, 1 );
 586         else
 587             ret = redraw_window_rects( hwnd, flags, (const RECT *)data->Buffer, data->rdh.nCount );
 588         HeapFree( GetProcessHeap(), 0, data );
 589     }
 590
 591     if (flags & RDW_UPDATENOW) update_now( hwnd, flags );
 592     else if (flags & RDW_ERASENOW) erase_now( hwnd, flags );
 593
 594     return ret;
 595 }
 596
 597
 598 /***********************************************************************
 599  *              UpdateWindow (USER32.@)
 600  */
 601 BOOL WINAPI UpdateWindow( HWND hwnd )
 602 {
 603     return RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_ALLCHILDREN );
 604 }
 605
 606
 607 /***********************************************************************
 608  *              InvalidateRgn (USER32.@)
 609  */
 610 BOOL WINAPI InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
 611 {
 612     return RedrawWindow(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 613 }
 614
 615
 616 /***********************************************************************
 617  *              InvalidateRect (USER32.@)
 618  */
 619 BOOL WINAPI InvalidateRect( HWND hwnd, const RECT *rect, BOOL erase )
 620 {
 621     return RedrawWindow( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 622 }
 623
 624
 625 /***********************************************************************
 626  *              ValidateRgn (USER32.@)
 627  */
 628 BOOL WINAPI ValidateRgn( HWND hwnd, HRGN hrgn )
 629 {
 630     return RedrawWindow( hwnd, NULL, hrgn, RDW_VALIDATE );
 631 }
 632
 633
 634 /***********************************************************************
 635  *              ValidateRect (USER32.@)
 636  */
 637 BOOL WINAPI ValidateRect( HWND hwnd, const RECT *rect )
 638 {
 639     return RedrawWindow( hwnd, rect, 0, RDW_VALIDATE );
 640 }
 641
 642
 643 /***********************************************************************
 644  *              GetUpdateRgn (USER32.@)
 645  */
 646 INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
 647 {
 648     INT retval = ERROR;
 649     UINT flags = UPDATE_NOCHILDREN;
 650     HRGN update_rgn;
 651
 652     if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
 653
 654     if ((update_rgn = send_ncpaint( hwnd, NULL, &flags )))
 655     {
 656         POINT offset;
 657
 658         retval = CombineRgn( hrgn, update_rgn, 0, RGN_COPY );
 659         send_erase( hwnd, flags, update_rgn, NULL, NULL );
 660         /* map region to client coordinates */
 661         offset.x = offset.y = 0;
 662         ScreenToClient( hwnd, &offset );
 663         OffsetRgn( hrgn, offset.x, offset.y );
 664     }
 665     return retval;
 666 }
 667
 668
 669 /***********************************************************************
 670  *              GetUpdateRect (USER32.@)
 671  */
 672 BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
 673 {
 674     UINT flags = UPDATE_NOCHILDREN;
 675     HRGN update_rgn;
 676
 677     if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
 678
 679     if (!(update_rgn = send_ncpaint( hwnd, NULL, &flags ))) return FALSE;
 680
 681     if (rect)
 682     {
 683         if (GetRgnBox( update_rgn, rect ) != NULLREGION)
 684         {
 685             HDC hdc = GetDCEx( hwnd, 0, DCX_USESTYLE );
 686             MapWindowPoints( 0, hwnd, (LPPOINT)rect, 2 );
 687             DPtoLP( hdc, (LPPOINT)rect, 2 );
 688             ReleaseDC( hwnd, hdc );
 689         }
 690     }
 691     send_erase( hwnd, flags, update_rgn, NULL, NULL );
 692
 693     /* check if we still have an update region */
 694     flags = UPDATE_PAINT | UPDATE_NOCHILDREN;
 695     return (get_update_flags( hwnd, NULL, &flags ) && (flags & UPDATE_PAINT));
 696 }
 697
 698
 699 /***********************************************************************
 700  *              ExcludeUpdateRgn (USER32.@)
 701  */
 702 INT WINAPI ExcludeUpdateRgn( HDC hdc, HWND hwnd )
 703 {
 704     HRGN update_rgn = CreateRectRgn( 0, 0, 0, 0 );
 705     INT ret = GetUpdateRgn( hwnd, update_rgn, FALSE );
 706
 707     if (ret != ERROR)
 708     {
 709         POINT pt;
 710
 711         GetDCOrgEx( hdc, &pt );
 712         MapWindowPoints( 0, hwnd, &pt, 1 );
 713         OffsetRgn( update_rgn, -pt.x, -pt.y );
 714         ret = ExtSelectClipRgn( hdc, update_rgn, RGN_DIFF );
 715         DeleteObject( update_rgn );
 716     }
 717     return ret;
 718 }
 719
 720
 721 /*************************************************************************
 722  *              ScrollWindowEx (USER32.@)
 723  *
 724  * Note: contrary to what the doc says, pixels that are scrolled from the
 725  *      outside of clipRect to the inside are NOT painted.
 726  *
 727  */
 728 INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
 729                            const RECT *rect, const RECT *clipRect,
 730                            HRGN hrgnUpdate, LPRECT rcUpdate,
 731                            UINT flags )
 732 {
 733     INT   retVal = NULLREGION;
 734     BOOL  bOwnRgn = TRUE;
 735     BOOL  bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
 736     int rdw_flags;
 737     HRGN  hrgnTemp;
 738     HRGN  hrgnWinupd = 0;
 739     HDC   hDC;
 740     RECT  rc, cliprc;
 741     RECT caretrc;
 742     HWND hwndCaret = NULL;
 743
 744     TRACE( "%p, %d,%d hrgnUpdate=%p rcUpdate = %p %s %04x\n",
 745            hwnd, dx, dy, hrgnUpdate, rcUpdate, wine_dbgstr_rect(rect), flags );
 746     TRACE( "clipRect = %s\n", wine_dbgstr_rect(clipRect));
 747     if( flags & ~( SW_SCROLLCHILDREN | SW_INVALIDATE | SW_ERASE))
 748         FIXME("some flags (%04x) are unhandled\n", flags);
 749
 750     rdw_flags = (flags & SW_ERASE) && (flags & SW_INVALIDATE) ?
 751                                 RDW_INVALIDATE | RDW_ERASE  : RDW_INVALIDATE ;
 752
 753     if (!WIN_IsWindowDrawable( hwnd, TRUE )) return ERROR;
 754     hwnd = WIN_GetFullHandle( hwnd );
 755
 756     GetClientRect(hwnd, &rc);
 757     if (rect) IntersectRect(&rc, &rc, rect);
 758
 759     if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
 760     else cliprc = rc;
 761
 762     if( hrgnUpdate ) bOwnRgn = FALSE;
 763     else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
 764
 765     if( !IsRectEmpty(&cliprc) && (dx || dy)) {
 766         DWORD dcxflags = DCX_CACHE;
 767         DWORD style = GetWindowLongW( hwnd, GWL_STYLE );
 768         caretrc = rc;
 769         hwndCaret = fix_caret(hwnd, &caretrc, flags);
 770
 771         if( style & WS_CLIPSIBLINGS) dcxflags |= DCX_CLIPSIBLINGS;
 772         if( GetClassLongW( hwnd, GCL_STYLE ) & CS_PARENTDC)
 773             dcxflags |= DCX_PARENTCLIP;
 774         if( !(flags & SW_SCROLLCHILDREN) && (style & WS_CLIPCHILDREN))
 775             dcxflags |= DCX_CLIPCHILDREN;
 776         hDC = GetDCEx( hwnd, 0, dcxflags);
 777         if (hDC)
 778         {
 779             ScrollDC( hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate );
 780
 781             ReleaseDC( hwnd, hDC );
 782
 783             if (!bUpdate)
 784                 RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags);
 785         }
 786
 787         /* If the windows has an update region, this must be
 788          * scrolled as well. Keep a copy in hrgnWinupd
 789          * to be added to hrngUpdate at the end. */
 790         hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
 791         retVal = GetUpdateRgn( hwnd, hrgnTemp, FALSE );
 792         if (retVal != NULLREGION)
 793         {
 794             HRGN hrgnClip = CreateRectRgnIndirect(&cliprc);
 795             if( !bOwnRgn) {
 796                 hrgnWinupd = CreateRectRgn( 0, 0, 0, 0);
 797                 CombineRgn( hrgnWinupd, hrgnTemp, 0, RGN_COPY);
 798             }
 799             OffsetRgn( hrgnTemp, dx, dy );
 800             CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
 801             if( !bOwnRgn)
 802                 CombineRgn( hrgnWinupd, hrgnWinupd, hrgnTemp, RGN_OR );
 803             RedrawWindow( hwnd, NULL, hrgnTemp, rdw_flags);
 804             DeleteObject( hrgnClip );
 805         }
 806         DeleteObject( hrgnTemp );
 807     } else {
 808         /* nothing was scrolled */
 809         if( !bOwnRgn)
 810             SetRectRgn( hrgnUpdate, 0, 0, 0, 0 );
 811         SetRectEmpty( rcUpdate);
 812     }
 813
 814     if( flags & SW_SCROLLCHILDREN )
 815     {
 816         HWND *list = WIN_ListChildren( hwnd );
 817         if (list)
 818         {
 819             int i;
 820             RECT r, dummy;
 821             for (i = 0; list[i]; i++)
 822             {
 823                 GetWindowRect( list[i], &r );
 824                 MapWindowPoints( 0, hwnd, (POINT *)&r, 2 );
 825                 if (!rect || IntersectRect(&dummy, &r, rect))
 826                     SetWindowPos( list[i], 0, r.left + dx, r.top  + dy, 0, 0,
 827                                   SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
 828                                   SWP_NOREDRAW | SWP_DEFERERASE );
 829             }
 830             HeapFree( GetProcessHeap(), 0, list );
 831         }
 832     }
 833
 834     if( flags & (SW_INVALIDATE | SW_ERASE) )
 835         RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags |
 836                       ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
 837
 838     if( hrgnWinupd) {
 839         CombineRgn( hrgnUpdate, hrgnUpdate, hrgnWinupd, RGN_OR);
 840         DeleteObject( hrgnWinupd);
 841     }
 842
 843     if( hwndCaret ) {
 844         SetCaretPos( caretrc.left + dx, caretrc.top + dy );
 845         ShowCaret(hwndCaret);
 846     }
 847
 848     if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
 849
 850     return retVal;
 851 }
 852
 853
 854 /*************************************************************************
 855  *              ScrollWindow (USER32.@)
 856  *
 857  */
 858 BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
 859                           const RECT *rect, const RECT *clipRect )
 860 {
 861     return (ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
 862                                      (rect ? 0 : SW_SCROLLCHILDREN) |
 863                                      SW_INVALIDATE | SW_ERASE ));
 864 }
 865
 866
 867 /*************************************************************************
 868  *              ScrollDC (USER32.@)
 869  *
 870  * dx, dy, lprcScroll and lprcClip are all in logical coordinates (msdn is
 871  * wrong) hrgnUpdate is returned in device coordinates with rcUpdate in
 872  * logical coordinates.
 873  */
 874 BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
 875                       const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
 876
 877 {
 878     if (USER_Driver.pScrollDC)
 879         return USER_Driver.pScrollDC( hdc, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate );
 880     return FALSE;
 881 }