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