dlls/user32/painting.c

   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  = wine_server_user_handle( 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         = wine_server_ptr_handle( 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     __wine_set_visible_region( dce->hdc, vis_rgn, &win_rect );
 164 }
 165
 166
 167 /***********************************************************************
 168  *              reset_dce_attrs
 169  */
 170 static void reset_dce_attrs( struct dce *dce )
 171 {
 172     RestoreDC( dce->hdc, 1 );  /* initial save level is always 1 */
 173     SaveDC( dce->hdc );  /* save the state again for next time */
 174 }
 175
 176
 177 /***********************************************************************
 178  *              release_dce
 179  */
 180 static void release_dce( struct dce *dce )
 181 {
 182     if (!dce->hwnd) return;  /* already released */
 183
 184     USER_Driver->pReleaseDC( dce->hwnd, dce->hdc );
 185
 186     if (dce->clip_rgn) DeleteObject( dce->clip_rgn );
 187     dce->clip_rgn = 0;
 188     dce->hwnd     = 0;
 189     dce->flags   &= DCX_CACHE;
 190 }
 191
 192
 193 /***********************************************************************
 194  *   delete_clip_rgn
 195  */
 196 static void delete_clip_rgn( struct dce *dce )
 197 {
 198     if (!dce->clip_rgn) return;  /* nothing to do */
 199
 200     dce->flags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN);
 201     DeleteObject( dce->clip_rgn );
 202     dce->clip_rgn = 0;
 203
 204     /* make it dirty so that the vis rgn gets recomputed next time */
 205     SetHookFlags( dce->hdc, DCHF_INVALIDATEVISRGN );
 206 }
 207
 208
 209 /***********************************************************************
 210  *           alloc_dce
 211  *
 212  * Allocate a new DCE.
 213  */
 214 static struct dce *alloc_dce(void)
 215 {
 216     struct dce *dce;
 217
 218     if (!(dce = HeapAlloc( GetProcessHeap(), 0, sizeof(*dce) ))) return NULL;
 219     if (!(dce->hdc = CreateDCW( displayW, NULL, NULL, NULL )))
 220     {
 221         HeapFree( GetProcessHeap(), 0, dce );
 222         return 0;
 223     }
 224     SaveDC( dce->hdc );
 225
 226     dce->hwnd      = 0;
 227     dce->clip_rgn  = 0;
 228     dce->flags     = 0;
 229     dce->count     = 1;
 230
 231     /* store DCE handle in DC hook data field */
 232     SetDCHook( dce->hdc, dc_hook, (DWORD_PTR)dce );
 233     SetHookFlags( dce->hdc, DCHF_INVALIDATEVISRGN );
 234     return dce;
 235 }
 236
 237
 238 /***********************************************************************
 239  *              get_window_dce
 240  */
 241 static struct dce *get_window_dce( HWND hwnd )
 242 {
 243     struct dce *dce;
 244     WND *win = WIN_GetPtr( hwnd );
 245
 246     if (!win || win == WND_OTHER_PROCESS || win == WND_DESKTOP) return NULL;
 247
 248     dce = win->dce;
 249     if (!dce && (dce = get_class_dce( win->class )))
 250     {
 251         win->dce = dce;
 252         dce->count++;
 253     }
 254     WIN_ReleasePtr( win );
 255
 256     if (!dce)  /* try to allocate one */
 257     {
 258         struct dce *dce_to_free = NULL;
 259         LONG class_style = GetClassLongW( hwnd, GCL_STYLE );
 260
 261         if (class_style & CS_CLASSDC)
 262         {
 263             if (!(dce = alloc_dce())) return NULL;
 264
 265             win = WIN_GetPtr( hwnd );
 266             if (win && win != WND_OTHER_PROCESS && win != WND_DESKTOP)
 267             {
 268                 if (win->dce)  /* another thread beat us to it */
 269                 {
 270                     dce_to_free = dce;
 271                     dce = win->dce;
 272                 }
 273                 else if ((win->dce = set_class_dce( win->class, dce )) != dce)
 274                 {
 275                     dce_to_free = dce;
 276                     dce = win->dce;
 277                     dce->count++;
 278                 }
 279                 else
 280                 {
 281                     dce->count++;
 282                     list_add_tail( &dce_list, &dce->entry );
 283                 }
 284                 WIN_ReleasePtr( win );
 285             }
 286             else dce_to_free = dce;
 287         }
 288         else if (class_style & CS_OWNDC)
 289         {
 290             if (!(dce = alloc_dce())) return NULL;
 291
 292             win = WIN_GetPtr( hwnd );
 293             if (win && win != WND_OTHER_PROCESS && win != WND_DESKTOP)
 294             {
 295                 if (win->dwStyle & WS_CLIPCHILDREN) dce->flags |= DCX_CLIPCHILDREN;
 296                 if (win->dwStyle & WS_CLIPSIBLINGS) dce->flags |= DCX_CLIPSIBLINGS;
 297                 if (win->dce)  /* another thread beat us to it */
 298                 {
 299                     dce_to_free = dce;
 300                     dce = win->dce;
 301                 }
 302                 else
 303                 {
 304                     win->dce = dce;
 305                     dce->hwnd = hwnd;
 306                     dce->count++;
 307                     list_add_tail( &dce_list, &dce->entry );
 308                 }
 309                 WIN_ReleasePtr( win );
 310             }
 311             else dce_to_free = dce;
 312         }
 313
 314         if (dce_to_free)
 315         {
 316             SetDCHook( dce->hdc, NULL, 0 );
 317             DeleteDC( dce->hdc );
 318             HeapFree( GetProcessHeap(), 0, dce );
 319         }
 320     }
 321     return dce;
 322 }
 323
 324
 325 /***********************************************************************
 326  *           free_dce
 327  *
 328  * Free a class or window DCE.
 329  */
 330 void free_dce( struct dce *dce, HWND hwnd )
 331 {
 332     USER_Lock();
 333
 334     if (dce)
 335     {
 336         if (!--dce->count)
 337         {
 338             /* turn it into a cache entry */
 339             reset_dce_attrs( dce );
 340             release_dce( dce );
 341             dce->flags |= DCX_CACHE;
 342         }
 343         else if (dce->hwnd == hwnd)
 344         {
 345             release_dce( dce );
 346         }
 347     }
 348
 349     /* now check for cache DCEs */
 350
 351     if (hwnd)
 352     {
 353         LIST_FOR_EACH_ENTRY( dce, &dce_list, struct dce, entry )
 354         {
 355             if (dce->hwnd != hwnd) continue;
 356             if (!(dce->flags & DCX_CACHE)) continue;
 357
 358             if (dce->count) WARN( "GetDC() without ReleaseDC() for window %p\n", hwnd );
 359             dce->count = 0;
 360             release_dce( dce );
 361         }
 362     }
 363
 364     USER_Unlock();
 365 }
 366
 367
 368 /***********************************************************************
 369  *           make_dc_dirty
 370  *
 371  * Mark the associated DC as dirty to force a refresh of the visible region
 372  */
 373 static void make_dc_dirty( struct dce *dce )
 374 {
 375     if (!dce->count)
 376     {
 377         /* Don't bother with visible regions of unused DCEs */
 378         TRACE("\tpurged %p dce [%p]\n", dce, dce->hwnd);
 379         release_dce( dce );
 380     }
 381     else
 382     {
 383         /* Set dirty bits in the hDC and DCE structs */
 384         TRACE("\tfixed up %p dce [%p]\n", dce, dce->hwnd);
 385         SetHookFlags( dce->hdc, DCHF_INVALIDATEVISRGN );
 386     }
 387 }
 388
 389
 390 /***********************************************************************
 391  *   invalidate_dce
 392  *
 393  * It is called from SetWindowPos() - we have to
 394  * mark as dirty all busy DCEs for windows that have pWnd->parent as
 395  * an ancestor and whose client rect intersects with specified update
 396  * rectangle. In addition, pWnd->parent DCEs may need to be updated if
 397  * DCX_CLIPCHILDREN flag is set.
 398  */
 399 void invalidate_dce( HWND hwnd, const RECT *rect )
 400 {
 401     RECT window_rect, extra_rect;
 402     struct dce *dce;
 403     HWND hwndScope = GetAncestor( hwnd, GA_PARENT );
 404
 405     if (!hwndScope) return;
 406
 407     GetWindowRect( hwnd, &window_rect );
 408     if (rect)
 409     {
 410         extra_rect = *rect;
 411         MapWindowPoints( hwndScope, 0, (POINT *)&extra_rect, 2 );
 412     }
 413
 414     TRACE("%p scope hwnd = %p %s (%s)\n",
 415           hwnd, hwndScope, wine_dbgstr_rect(&window_rect), wine_dbgstr_rect(rect) );
 416
 417     /* walk all DCEs and fixup non-empty entries */
 418
 419     USER_Lock();
 420     LIST_FOR_EACH_ENTRY( dce, &dce_list, struct dce, entry )
 421     {
 422         TRACE( "%p: hwnd %p dcx %08x %s %s\n", dce, dce->hwnd, dce->flags,
 423                (dce->flags & DCX_CACHE) ? "Cache" : "Owned", dce->count ? "InUse" : "" );
 424
 425         if (!dce->hwnd) continue;
 426         if ((dce->hwnd == hwndScope) && !(dce->flags & DCX_CLIPCHILDREN))
 427             continue;  /* child window positions don't bother us */
 428
 429         /* if DCE window is a child of hwnd, it has to be invalidated */
 430         if (dce->hwnd == hwnd || IsChild( hwnd, dce->hwnd ))
 431         {
 432             make_dc_dirty( dce );
 433         }
 434         else  /* otherwise check if the window rectangle intersects this DCE window */
 435         {
 436             if (hwndScope == GetDesktopWindow() ||
 437                 hwndScope == dce->hwnd || IsChild( hwndScope, dce->hwnd ))
 438             {
 439                 RECT dce_rect, tmp;
 440                 GetWindowRect( dce->hwnd, &dce_rect );
 441                 if (IntersectRect( &tmp, &dce_rect, &window_rect ) ||
 442                     (rect && IntersectRect( &tmp, &dce_rect, &extra_rect )))
 443                     make_dc_dirty( dce );
 444             }
 445         }
 446     }
 447     USER_Unlock();
 448 }
 449
 450 /***********************************************************************
 451  *              release_dc
 452  *
 453  * Implementation of ReleaseDC.
 454  */
 455 static INT release_dc( HWND hwnd, HDC hdc, BOOL end_paint )
 456 {
 457     struct dce *dce;
 458     BOOL ret = FALSE;
 459
 460     TRACE("%p %p\n", hwnd, hdc );
 461
 462     USER_Lock();
 463     dce = (struct dce *)GetDCHook( hdc, NULL );
 464     if (dce && dce->count)
 465     {
 466         if (!(dce->flags & DCX_NORESETATTRS)) reset_dce_attrs( dce );
 467         if (end_paint || (dce->flags & DCX_CACHE)) delete_clip_rgn( dce );
 468         if (dce->flags & DCX_CACHE) dce->count = 0;
 469         ret = TRUE;
 470     }
 471     USER_Unlock();
 472     return ret;
 473 }
 474
 475
 476 /***********************************************************************
 477  *              dc_hook
 478  *
 479  * See "Undoc. Windows" for hints (DC, SetDCHook, SetHookFlags)..
 480  */
 481 static BOOL CALLBACK dc_hook( HDC hDC, WORD code, DWORD_PTR data, LPARAM lParam )
 482 {
 483     BOOL retv = TRUE;
 484     struct dce *dce = (struct dce *)data;
 485
 486     TRACE("hDC = %p, %u\n", hDC, code);
 487
 488     if (!dce) return 0;
 489     assert( dce->hdc == hDC );
 490
 491     switch( code )
 492     {
 493     case DCHC_INVALIDVISRGN:
 494         /* GDI code calls this when it detects that the
 495          * DC is dirty (usually after SetHookFlags()). This
 496          * means that we have to recompute the visible region.
 497          */
 498         if (dce->count) update_visible_region( dce );
 499         else /* non-fatal but shouldn't happen */
 500             WARN("DC is not in use!\n");
 501         break;
 502     case DCHC_DELETEDC:
 503         /*
 504          * Windows will not let you delete a DC that is busy
 505          * (between GetDC and ReleaseDC)
 506          */
 507         USER_Lock();
 508         if (dce->count > 1)
 509         {
 510             WARN("Application trying to delete a busy DC %p\n", dce->hdc);
 511             retv = FALSE;
 512         }
 513         else
 514         {
 515             list_remove( &dce->entry );
 516             if (dce->clip_rgn) DeleteObject( dce->clip_rgn );
 517             HeapFree( GetProcessHeap(), 0, dce );
 518         }
 519         USER_Unlock();
 520         break;
 521     }
 522     return retv;
 523 }
 524
 525
 526 /***********************************************************************
 527  *           get_update_region
 528  *
 529  * Return update region (in screen coordinates) for a window.
 530  */
 531 static HRGN get_update_region( HWND hwnd, UINT *flags, HWND *child )
 532 {
 533     HRGN hrgn = 0;
 534     NTSTATUS status;
 535     RGNDATA *data;
 536     size_t size = 256;
 537
 538     do
 539     {
 540         if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data) + size - 1 )))
 541         {
 542             SetLastError( ERROR_OUTOFMEMORY );
 543             return 0;
 544         }
 545
 546         SERVER_START_REQ( get_update_region )
 547         {
 548             req->window     = wine_server_user_handle( hwnd );
 549             req->from_child = wine_server_user_handle( child ? *child : 0 );
 550             req->flags      = *flags;
 551             wine_server_set_reply( req, data->Buffer, size );
 552             if (!(status = wine_server_call( req )))
 553             {
 554                 size_t reply_size = wine_server_reply_size( reply );
 555                 data->rdh.dwSize   = sizeof(data->rdh);
 556                 data->rdh.iType    = RDH_RECTANGLES;
 557                 data->rdh.nCount   = reply_size / sizeof(RECT);
 558                 data->rdh.nRgnSize = reply_size;
 559                 hrgn = ExtCreateRegion( NULL, size, data );
 560                 if (child) *child = wine_server_ptr_handle( reply->child );
 561                 *flags = reply->flags;
 562             }
 563             else size = reply->total_size;
 564         }
 565         SERVER_END_REQ;
 566         HeapFree( GetProcessHeap(), 0, data );
 567     } while (status == STATUS_BUFFER_OVERFLOW);
 568
 569     if (status) SetLastError( RtlNtStatusToDosError(status) );
 570     return hrgn;
 571 }
 572
 573
 574 /***********************************************************************
 575  *           get_update_flags
 576  *
 577  * Get only the update flags, not the update region.
 578  */
 579 static BOOL get_update_flags( HWND hwnd, HWND *child, UINT *flags )
 580 {
 581     BOOL ret;
 582
 583     SERVER_START_REQ( get_update_region )
 584     {
 585         req->window     = wine_server_user_handle( hwnd );
 586         req->from_child = wine_server_user_handle( child ? *child : 0 );
 587         req->flags      = *flags | UPDATE_NOREGION;
 588         if ((ret = !wine_server_call_err( req )))
 589         {
 590             if (child) *child = wine_server_ptr_handle( reply->child );
 591             *flags = reply->flags;
 592         }
 593     }
 594     SERVER_END_REQ;
 595     return ret;
 596 }
 597
 598
 599 /***********************************************************************
 600  *           redraw_window_rects
 601  *
 602  * Redraw part of a window.
 603  */
 604 static BOOL redraw_window_rects( HWND hwnd, UINT flags, const RECT *rects, UINT count )
 605 {
 606     BOOL ret;
 607
 608     if (!(flags & (RDW_INVALIDATE|RDW_VALIDATE|RDW_INTERNALPAINT|RDW_NOINTERNALPAINT)))
 609         return TRUE;  /* nothing to do */
 610
 611     SERVER_START_REQ( redraw_window )
 612     {
 613         req->window = wine_server_user_handle( hwnd );
 614         req->flags  = flags;
 615         wine_server_add_data( req, rects, count * sizeof(RECT) );
 616         ret = !wine_server_call_err( req );
 617     }
 618     SERVER_END_REQ;
 619     return ret;
 620 }
 621
 622
 623 /***********************************************************************
 624  *           send_ncpaint
 625  *
 626  * Send a WM_NCPAINT message if needed, and return the resulting update region (in screen coords).
 627  * Helper for erase_now and BeginPaint.
 628  */
 629 static HRGN send_ncpaint( HWND hwnd, HWND *child, UINT *flags )
 630 {
 631     HRGN whole_rgn = get_update_region( hwnd, flags, child );
 632     HRGN client_rgn = 0;
 633
 634     if (child) hwnd = *child;
 635
 636     if (hwnd == GetDesktopWindow()) return whole_rgn;
 637
 638     if (whole_rgn)
 639     {
 640         RECT client, update;
 641         INT type;
 642
 643         /* check if update rgn overlaps with nonclient area */
 644         type = GetRgnBox( whole_rgn, &update );
 645         GetClientRect( hwnd, &client );
 646         MapWindowPoints( hwnd, 0, (POINT *)&client, 2 );
 647
 648         if ((*flags & UPDATE_NONCLIENT) ||
 649             update.left < client.left || update.top < client.top ||
 650             update.right > client.right || update.bottom > client.bottom)
 651         {
 652             client_rgn = CreateRectRgnIndirect( &client );
 653             CombineRgn( client_rgn, client_rgn, whole_rgn, RGN_AND );
 654
 655             /* check if update rgn contains complete nonclient area */
 656             if (type == SIMPLEREGION)
 657             {
 658                 RECT window;
 659                 GetWindowRect( hwnd, &window );
 660                 if (EqualRect( &window, &update ))
 661                 {
 662                     DeleteObject( whole_rgn );
 663                     whole_rgn = (HRGN)1;
 664                 }
 665             }
 666         }
 667         else
 668         {
 669             client_rgn = whole_rgn;
 670             whole_rgn = 0;
 671         }
 672
 673         if (whole_rgn) /* NOTE: WM_NCPAINT allows wParam to be 1 */
 674         {
 675             if (*flags & UPDATE_NONCLIENT) SendMessageW( hwnd, WM_NCPAINT, (WPARAM)whole_rgn, 0 );
 676             if (whole_rgn > (HRGN)1) DeleteObject( whole_rgn );
 677         }
 678     }
 679     return client_rgn;
 680 }
 681
 682
 683 /***********************************************************************
 684  *           send_erase
 685  *
 686  * Send a WM_ERASEBKGND message if needed, and optionally return the DC for painting.
 687  * If a DC is requested, the region is selected into it. In all cases the region is deleted.
 688  * Helper for erase_now and BeginPaint.
 689  */
 690 static BOOL send_erase( HWND hwnd, UINT flags, HRGN client_rgn,
 691                         RECT *clip_rect, HDC *hdc_ret )
 692 {
 693     BOOL need_erase = (flags & UPDATE_DELAYED_ERASE) != 0;
 694     HDC hdc = 0;
 695     RECT dummy;
 696
 697     if (!clip_rect) clip_rect = &dummy;
 698     if (hdc_ret || (flags & UPDATE_ERASE))
 699     {
 700         UINT dcx_flags = DCX_INTERSECTRGN | DCX_USESTYLE;
 701         if (IsIconic(hwnd)) dcx_flags |= DCX_WINDOW;
 702
 703         if ((hdc = GetDCEx( hwnd, client_rgn, dcx_flags )))
 704         {
 705             INT type = GetClipBox( hdc, clip_rect );
 706
 707             if (flags & UPDATE_ERASE)
 708             {
 709                 /* don't erase if the clip box is empty */
 710                 if (type != NULLREGION)
 711                     need_erase = !SendMessageW( hwnd, WM_ERASEBKGND, (WPARAM)hdc, 0 );
 712             }
 713             if (!hdc_ret) release_dc( hwnd, hdc, TRUE );
 714         }
 715
 716         if (hdc_ret) *hdc_ret = hdc;
 717     }
 718     if (!hdc) DeleteObject( client_rgn );
 719     return need_erase;
 720 }
 721
 722
 723 /***********************************************************************
 724  *           erase_now
 725  *
 726  * Implementation of RDW_ERASENOW behavior.
 727  */
 728 void erase_now( HWND hwnd, UINT rdw_flags )
 729 {
 730     HWND child = 0;
 731     HRGN hrgn;
 732     BOOL need_erase = FALSE;
 733
 734     /* loop while we find a child to repaint */
 735     for (;;)
 736     {
 737         UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE;
 738
 739         if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
 740         else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
 741         if (need_erase) flags |= UPDATE_DELAYED_ERASE;
 742
 743         if (!(hrgn = send_ncpaint( hwnd, &child, &flags ))) break;
 744         need_erase = send_erase( child, flags, hrgn, NULL, NULL );
 745
 746         if (!flags) break;  /* nothing more to do */
 747         if ((rdw_flags & RDW_NOCHILDREN) && !need_erase) break;
 748     }
 749 }
 750
 751
 752 /***********************************************************************
 753  *           update_now
 754  *
 755  * Implementation of RDW_UPDATENOW behavior.
 756  *
 757  * FIXME: Windows uses WM_SYNCPAINT to cut down the number of intertask
 758  * SendMessage() calls. This is a comment inside DefWindowProc() source
 759  * from 16-bit SDK:
 760  *
 761  *   This message avoids lots of inter-app message traffic
 762  *   by switching to the other task and continuing the
 763  *   recursion there.
 764  *
 765  * wParam         = flags
 766  * LOWORD(lParam) = hrgnClip
 767  * HIWORD(lParam) = hwndSkip  (not used; always NULL)
 768  *
 769  */
 770 static void update_now( HWND hwnd, UINT rdw_flags )
 771 {
 772     HWND child = 0;
 773
 774     /* desktop window never gets WM_PAINT, only WM_ERASEBKGND */
 775     if (hwnd == GetDesktopWindow()) erase_now( hwnd, rdw_flags | RDW_NOCHILDREN );
 776
 777     /* loop while we find a child to repaint */
 778     for (;;)
 779     {
 780         UINT flags = UPDATE_PAINT | UPDATE_INTERNALPAINT;
 781
 782         if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
 783         else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
 784
 785         if (!get_update_flags( hwnd, &child, &flags )) break;
 786         if (!flags) break;  /* nothing more to do */
 787
 788         SendMessageW( child, WM_PAINT, 0, 0 );
 789         if (rdw_flags & RDW_NOCHILDREN) break;
 790     }
 791 }
 792
 793
 794 /*************************************************************************
 795  *             fix_caret
 796  *
 797  * Helper for ScrollWindowEx:
 798  * If the return value is 0, no special caret handling is necessary.
 799  * Otherwise the return value is the handle of the window that owns the
 800  * caret. Its caret needs to be hidden during the scroll operation and
 801  * moved to new_caret_pos if move_caret is TRUE.
 802  */
 803 static HWND fix_caret(HWND hWnd, const RECT *scroll_rect, INT dx, INT dy,
 804                      UINT flags, LPBOOL move_caret, LPPOINT new_caret_pos)
 805 {
 806     GUITHREADINFO info;
 807     RECT rect, mapped_rcCaret;
 808     BOOL hide_caret = FALSE;
 809
 810     if (!GetGUIThreadInfo( GetCurrentThreadId(), &info )) return 0;
 811     if (!info.hwndCaret) return 0;
 812
 813     if (info.hwndCaret == hWnd)
 814     {
 815         /* Move the caret if it's (partially) in the source rectangle */
 816         if (IntersectRect(&rect, scroll_rect, &info.rcCaret))
 817         {
 818             *move_caret = TRUE;
 819             hide_caret = TRUE;
 820             new_caret_pos->x = info.rcCaret.left + dx;
 821             new_caret_pos->y = info.rcCaret.top + dy;
 822         }
 823         else
 824         {
 825             *move_caret = FALSE;
 826
 827             /* Hide the caret if it's in the destination rectangle */
 828             rect = *scroll_rect;
 829             OffsetRect(&rect, dx, dy);
 830             hide_caret = IntersectRect(&rect, &rect, &info.rcCaret);
 831         }
 832     }
 833     else
 834     {
 835         if ((flags & SW_SCROLLCHILDREN) && IsChild(hWnd, info.hwndCaret))
 836         {
 837             *move_caret = FALSE;
 838
 839             /* Hide the caret if it's in the source or in the destination
 840                rectangle */
 841             mapped_rcCaret = info.rcCaret;
 842             MapWindowPoints(info.hwndCaret, hWnd, (LPPOINT)&mapped_rcCaret, 2);
 843
 844             if (IntersectRect(&rect, scroll_rect, &mapped_rcCaret))
 845             {
 846                 hide_caret = TRUE;
 847             }
 848             else
 849             {
 850                 rect = *scroll_rect;
 851                 OffsetRect(&rect, dx, dy);
 852                 hide_caret = IntersectRect(&rect, &rect, &mapped_rcCaret);
 853             }
 854         }
 855         else
 856             return 0;
 857     }
 858
 859     if (hide_caret)
 860     {
 861         HideCaret(info.hwndCaret);
 862         return info.hwndCaret;
 863     }
 864     else
 865         return 0;
 866 }
 867
 868
 869 /***********************************************************************
 870  *              BeginPaint (USER32.@)
 871  */
 872 HDC WINAPI BeginPaint( HWND hwnd, PAINTSTRUCT *lps )
 873 {
 874     HRGN hrgn;
 875     UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE | UPDATE_PAINT | UPDATE_INTERNALPAINT | UPDATE_NOCHILDREN;
 876
 877     if (!lps) return 0;
 878
 879     HideCaret( hwnd );
 880
 881     if (!(hrgn = send_ncpaint( hwnd, NULL, &flags ))) return 0;
 882
 883     lps->fErase = send_erase( hwnd, flags, hrgn, &lps->rcPaint, &lps->hdc );
 884
 885     TRACE("hdc = %p box = (%s), fErase = %d\n",
 886           lps->hdc, wine_dbgstr_rect(&lps->rcPaint), lps->fErase);
 887
 888     return lps->hdc;
 889 }
 890
 891
 892 /***********************************************************************
 893  *              EndPaint (USER32.@)
 894  */
 895 BOOL WINAPI EndPaint( HWND hwnd, const PAINTSTRUCT *lps )
 896 {
 897     if (!lps) return FALSE;
 898     release_dc( hwnd, lps->hdc, TRUE );
 899     ShowCaret( hwnd );
 900     return TRUE;
 901 }
 902
 903
 904 /***********************************************************************
 905  *              GetDCEx (USER32.@)
 906  */
 907 HDC WINAPI GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags )
 908 {
 909     const DWORD clip_flags = DCX_PARENTCLIP | DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | DCX_WINDOW;
 910     const DWORD user_flags = clip_flags | DCX_NORESETATTRS; /* flags that can be set by user */
 911     struct dce *dce;
 912     BOOL bUpdateVisRgn = TRUE;
 913     HWND parent;
 914     LONG window_style = GetWindowLongW( hwnd, GWL_STYLE );
 915
 916     if (!hwnd) hwnd = GetDesktopWindow();
 917     else hwnd = WIN_GetFullHandle( hwnd );
 918
 919     TRACE("hwnd %p, hrgnClip %p, flags %08x\n", hwnd, hrgnClip, flags);
 920
 921     if (!IsWindow(hwnd)) return 0;
 922
 923     /* fixup flags */
 924
 925     if (flags & (DCX_WINDOW | DCX_PARENTCLIP)) flags |= DCX_CACHE;
 926
 927     if (flags & DCX_USESTYLE)
 928     {
 929         flags &= ~(DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP);
 930
 931         if (window_style & WS_CLIPSIBLINGS) flags |= DCX_CLIPSIBLINGS;
 932
 933         if (!(flags & DCX_WINDOW))
 934         {
 935             if (GetClassLongW( hwnd, GCL_STYLE ) & CS_PARENTDC) flags |= DCX_PARENTCLIP;
 936
 937             if (window_style & WS_CLIPCHILDREN && !(window_style & WS_MINIMIZE))
 938                 flags |= DCX_CLIPCHILDREN;
 939         }
 940     }
 941
 942     if (flags & DCX_WINDOW) flags &= ~DCX_CLIPCHILDREN;
 943
 944     parent = GetAncestor( hwnd, GA_PARENT );
 945     if (!parent || (parent == GetDesktopWindow()))
 946         flags = (flags & ~DCX_PARENTCLIP) | DCX_CLIPSIBLINGS;
 947
 948     /* it seems parent clip is ignored when clipping siblings or children */
 949     if (flags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN)) flags &= ~DCX_PARENTCLIP;
 950
 951     if( flags & DCX_PARENTCLIP )
 952     {
 953         LONG parent_style = GetWindowLongW( parent, GWL_STYLE );
 954         if( (window_style & WS_VISIBLE) && (parent_style & WS_VISIBLE) )
 955         {
 956             flags &= ~DCX_CLIPCHILDREN;
 957             if (parent_style & WS_CLIPSIBLINGS) flags |= DCX_CLIPSIBLINGS;
 958         }
 959     }
 960
 961     /* find a suitable DCE */
 962
 963     if ((flags & DCX_CACHE) || !(dce = get_window_dce( hwnd )))
 964     {
 965         struct dce *dceEmpty = NULL, *dceUnused = NULL;
 966
 967         /* Strategy: First, we attempt to find a non-empty but unused DCE with
 968          * compatible flags. Next, we look for an empty entry. If the cache is
 969          * full we have to purge one of the unused entries.
 970          */
 971         USER_Lock();
 972         LIST_FOR_EACH_ENTRY( dce, &dce_list, struct dce, entry )
 973         {
 974             if ((dce->flags & DCX_CACHE) && !dce->count)
 975             {
 976                 dceUnused = dce;
 977
 978                 if (!dce->hwnd) dceEmpty = dce;
 979                 else if ((dce->hwnd == hwnd) && !((dce->flags ^ flags) & clip_flags))
 980                 {
 981                     TRACE("\tfound valid %p dce [%p], flags %08x\n",
 982                           dce, hwnd, dce->flags );
 983                     bUpdateVisRgn = FALSE;
 984                     break;
 985                 }
 986             }
 987         }
 988
 989         if (&dce->entry == &dce_list)  /* nothing found */
 990             dce = dceEmpty ? dceEmpty : dceUnused;
 991
 992         if (dce) dce->count = 1;
 993
 994         USER_Unlock();
 995
 996         /* if there's no dce empty or unused, allocate a new one */
 997         if (!dce)
 998         {
 999             if (!(dce = alloc_dce())) return 0;
1000             dce->flags = DCX_CACHE;
1001             USER_Lock();
1002             list_add_head( &dce_list, &dce->entry );
1003             USER_Unlock();
1004         }
1005     }
1006     else
1007     {
1008         flags |= DCX_NORESETATTRS;
1009         if (dce->hwnd == hwnd)
1010         {
1011             TRACE("\tskipping hVisRgn update\n");
1012             bUpdateVisRgn = FALSE; /* updated automatically, via DCHook() */
1013         }
1014         else
1015         {
1016             /* we should free dce->clip_rgn here, but Windows apparently doesn't */
1017             dce->flags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN);
1018             dce->clip_rgn = 0;
1019         }
1020     }
1021
1022     if (flags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN))
1023     {
1024         /* if the extra clip region has changed, get rid of the old one */
1025         if (dce->clip_rgn != hrgnClip || ((flags ^ dce->flags) & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)))
1026             delete_clip_rgn( dce );
1027         dce->clip_rgn = hrgnClip;
1028         if (!dce->clip_rgn) dce->clip_rgn = CreateRectRgn( 0, 0, 0, 0 );
1029         dce->flags |= flags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN);
1030         bUpdateVisRgn = TRUE;
1031     }
1032
1033     if (GetWindowLongW( hwnd, GWL_EXSTYLE ) & WS_EX_LAYOUTRTL) SetLayout( dce->hdc, LAYOUT_RTL );
1034
1035     dce->hwnd = hwnd;
1036     dce->flags = (dce->flags & ~user_flags) | (flags & user_flags);
1037
1038     if (SetHookFlags( dce->hdc, DCHF_VALIDATEVISRGN )) bUpdateVisRgn = TRUE;  /* DC was dirty */
1039
1040     if (bUpdateVisRgn) update_visible_region( dce );
1041
1042     TRACE("(%p,%p,0x%x): returning %p\n", hwnd, hrgnClip, flags, dce->hdc);
1043     return dce->hdc;
1044 }
1045
1046
1047 /***********************************************************************
1048  *              GetDC (USER32.@)
1049  *
1050  * Get a device context.
1051  *
1052  * RETURNS
1053  *      Success: Handle to the device context
1054  *      Failure: NULL.
1055  */
1056 HDC WINAPI GetDC( HWND hwnd )
1057 {
1058     if (!hwnd) return GetDCEx( 0, 0, DCX_CACHE | DCX_WINDOW );
1059     return GetDCEx( hwnd, 0, DCX_USESTYLE );
1060 }
1061
1062
1063 /***********************************************************************
1064  *              GetWindowDC (USER32.@)
1065  */
1066 HDC WINAPI GetWindowDC( HWND hwnd )
1067 {
1068     return GetDCEx( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
1069 }
1070
1071
1072 /***********************************************************************
1073  *              ReleaseDC (USER32.@)
1074  *
1075  * Release a device context.
1076  *
1077  * RETURNS
1078  *      Success: Non-zero. Resources used by hdc are released.
1079  *      Failure: 0.
1080  */
1081 INT WINAPI ReleaseDC( HWND hwnd, HDC hdc )
1082 {
1083     return release_dc( hwnd, hdc, FALSE );
1084 }
1085
1086
1087 /**********************************************************************
1088  *              WindowFromDC (USER32.@)
1089  */
1090 HWND WINAPI WindowFromDC( HDC hdc )
1091 {
1092     struct dce *dce;
1093     HWND hwnd = 0;
1094
1095     USER_Lock();
1096     dce = (struct dce *)GetDCHook( hdc, NULL );
1097     if (dce) hwnd = dce->hwnd;
1098     USER_Unlock();
1099     return hwnd;
1100 }
1101
1102
1103 /***********************************************************************
1104  *              LockWindowUpdate (USER32.@)
1105  *
1106  * Enables or disables painting in the chosen window.
1107  *
1108  * PARAMS
1109  *  hwnd [I] handle to a window.
1110  *
1111  * RETURNS
1112  *  If successful, returns nonzero value. Otherwise,
1113  *  returns 0.
1114  *
1115  * NOTES
1116  *  You can lock only one window at a time.
1117  */
1118 BOOL WINAPI LockWindowUpdate( HWND hwnd )
1119 {
1120     static HWND lockedWnd;
1121
1122     FIXME("(%p), partial stub!\n",hwnd);
1123
1124     USER_Lock();
1125     if (lockedWnd)
1126     {
1127         if (!hwnd)
1128         {
1129             /* Unlock lockedWnd */
1130             /* FIXME: Do something */
1131         }
1132         else
1133         {
1134             /* Attempted to lock a second window */
1135             /* Return FALSE and do nothing */
1136             USER_Unlock();
1137             return FALSE;
1138         }
1139     }
1140     lockedWnd = hwnd;
1141     USER_Unlock();
1142     return TRUE;
1143 }
1144
1145
1146 /***********************************************************************
1147  *              RedrawWindow (USER32.@)
1148  */
1149 BOOL WINAPI RedrawWindow( HWND hwnd, const RECT *rect, HRGN hrgn, UINT flags )
1150 {
1151     static const RECT empty;
1152     BOOL ret;
1153
1154     if (!hwnd) hwnd = GetDesktopWindow();
1155
1156     if (TRACE_ON(win))
1157     {
1158         if (hrgn)
1159         {
1160             RECT r;
1161             GetRgnBox( hrgn, &r );
1162             TRACE( "%p region %p box %s ", hwnd, hrgn, wine_dbgstr_rect(&r) );
1163         }
1164         else if (rect)
1165             TRACE( "%p rect %s ", hwnd, wine_dbgstr_rect(rect) );
1166         else
1167             TRACE( "%p whole window ", hwnd );
1168
1169         dump_rdw_flags(flags);
1170     }
1171
1172     /* process pending expose events before painting */
1173     if (flags & RDW_UPDATENOW) USER_Driver->pMsgWaitForMultipleObjectsEx( 0, NULL, 0, QS_PAINT, 0 );
1174
1175     if (rect && !hrgn)
1176     {
1177         if (IsRectEmpty( rect )) rect = &empty;
1178         ret = redraw_window_rects( hwnd, flags, rect, 1 );
1179     }
1180     else if (!hrgn)
1181     {
1182         ret = redraw_window_rects( hwnd, flags, NULL, 0 );
1183     }
1184     else  /* need to build a list of the region rectangles */
1185     {
1186         DWORD size;
1187         RGNDATA *data = NULL;
1188
1189         if (!(size = GetRegionData( hrgn, 0, NULL ))) return FALSE;
1190         if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return FALSE;
1191         GetRegionData( hrgn, size, data );
1192         if (!data->rdh.nCount)  /* empty region -> use a single all-zero rectangle */
1193             ret = redraw_window_rects( hwnd, flags, &empty, 1 );
1194         else
1195             ret = redraw_window_rects( hwnd, flags, (const RECT *)data->Buffer, data->rdh.nCount );
1196         HeapFree( GetProcessHeap(), 0, data );
1197     }
1198
1199     if (flags & RDW_UPDATENOW) update_now( hwnd, flags );
1200     else if (flags & RDW_ERASENOW) erase_now( hwnd, flags );
1201
1202     return ret;
1203 }
1204
1205
1206 /***********************************************************************
1207  *              UpdateWindow (USER32.@)
1208  */
1209 BOOL WINAPI UpdateWindow( HWND hwnd )
1210 {
1211     return RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_ALLCHILDREN );
1212 }
1213
1214
1215 /***********************************************************************
1216  *              InvalidateRgn (USER32.@)
1217  */
1218 BOOL WINAPI InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1219 {
1220     if (!hwnd)
1221     {
1222         SetLastError( ERROR_INVALID_WINDOW_HANDLE );
1223         return FALSE;
1224     }
1225
1226     return RedrawWindow(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
1227 }
1228
1229
1230 /***********************************************************************
1231  *              InvalidateRect (USER32.@)
1232  *
1233  * MSDN: if hwnd parameter is NULL, InvalidateRect invalidates and redraws
1234  * all windows and sends WM_ERASEBKGND and WM_NCPAINT.
1235  */
1236 BOOL WINAPI InvalidateRect( HWND hwnd, const RECT *rect, BOOL erase )
1237 {
1238     UINT flags = RDW_INVALIDATE | (erase ? RDW_ERASE : 0);
1239
1240     if (!hwnd)
1241     {
1242         flags = RDW_ALLCHILDREN | RDW_INVALIDATE | RDW_FRAME | RDW_ERASE | RDW_ERASENOW;
1243         rect = NULL;
1244     }
1245
1246     return RedrawWindow( hwnd, rect, 0, flags );
1247 }
1248
1249
1250 /***********************************************************************
1251  *              ValidateRgn (USER32.@)
1252  */
1253 BOOL WINAPI ValidateRgn( HWND hwnd, HRGN hrgn )
1254 {
1255     if (!hwnd)
1256     {
1257         SetLastError( ERROR_INVALID_WINDOW_HANDLE );
1258         return FALSE;
1259     }
1260
1261     return RedrawWindow( hwnd, NULL, hrgn, RDW_VALIDATE );
1262 }
1263
1264
1265 /***********************************************************************
1266  *              ValidateRect (USER32.@)
1267  *
1268  * MSDN: if hwnd parameter is NULL, ValidateRect invalidates and redraws
1269  * all windows and sends WM_ERASEBKGND and WM_NCPAINT.
1270  */
1271 BOOL WINAPI ValidateRect( HWND hwnd, const RECT *rect )
1272 {
1273     UINT flags = RDW_VALIDATE;
1274
1275     if (!hwnd)
1276     {
1277         flags = RDW_ALLCHILDREN | RDW_INVALIDATE | RDW_FRAME | RDW_ERASE | RDW_ERASENOW;
1278         rect = NULL;
1279     }
1280
1281     return RedrawWindow( hwnd, rect, 0, flags );
1282 }
1283
1284
1285 /***********************************************************************
1286  *              GetUpdateRgn (USER32.@)
1287  */
1288 INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
1289 {
1290     INT retval = ERROR;
1291     UINT flags = UPDATE_NOCHILDREN;
1292     HRGN update_rgn;
1293
1294     if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
1295
1296     if ((update_rgn = send_ncpaint( hwnd, NULL, &flags )))
1297     {
1298         POINT offset;
1299
1300         retval = CombineRgn( hrgn, update_rgn, 0, RGN_COPY );
1301         if (send_erase( hwnd, flags, update_rgn, NULL, NULL ))
1302         {
1303             flags = UPDATE_DELAYED_ERASE;
1304             get_update_flags( hwnd, NULL, &flags );
1305         }
1306         /* map region to client coordinates */
1307         offset.x = offset.y = 0;
1308         ScreenToClient( hwnd, &offset );
1309         OffsetRgn( hrgn, offset.x, offset.y );
1310     }
1311     return retval;
1312 }
1313
1314
1315 /***********************************************************************
1316  *              GetUpdateRect (USER32.@)
1317  */
1318 BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
1319 {
1320     UINT flags = UPDATE_NOCHILDREN;
1321     HRGN update_rgn;
1322     BOOL need_erase;
1323
1324     if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
1325
1326     if (!(update_rgn = send_ncpaint( hwnd, NULL, &flags ))) return FALSE;
1327
1328     if (rect)
1329     {
1330         if (GetRgnBox( update_rgn, rect ) != NULLREGION)
1331         {
1332             HDC hdc = GetDCEx( hwnd, 0, DCX_USESTYLE );
1333             MapWindowPoints( 0, hwnd, (LPPOINT)rect, 2 );
1334             DPtoLP( hdc, (LPPOINT)rect, 2 );
1335             ReleaseDC( hwnd, hdc );
1336         }
1337     }
1338     need_erase = send_erase( hwnd, flags, update_rgn, NULL, NULL );
1339
1340     /* check if we still have an update region */
1341     flags = UPDATE_PAINT | UPDATE_NOCHILDREN;
1342     if (need_erase) flags |= UPDATE_DELAYED_ERASE;
1343     return (get_update_flags( hwnd, NULL, &flags ) && (flags & UPDATE_PAINT));
1344 }
1345
1346
1347 /***********************************************************************
1348  *              ExcludeUpdateRgn (USER32.@)
1349  */
1350 INT WINAPI ExcludeUpdateRgn( HDC hdc, HWND hwnd )
1351 {
1352     HRGN update_rgn = CreateRectRgn( 0, 0, 0, 0 );
1353     INT ret = GetUpdateRgn( hwnd, update_rgn, FALSE );
1354
1355     if (ret != ERROR)
1356     {
1357         POINT pt;
1358
1359         GetDCOrgEx( hdc, &pt );
1360         MapWindowPoints( 0, hwnd, &pt, 1 );
1361         OffsetRgn( update_rgn, -pt.x, -pt.y );
1362         ret = ExtSelectClipRgn( hdc, update_rgn, RGN_DIFF );
1363         DeleteObject( update_rgn );
1364     }
1365     return ret;
1366 }
1367
1368
1369 /*************************************************************************
1370  *              ScrollWindowEx (USER32.@)
1371  *
1372  * Note: contrary to what the doc says, pixels that are scrolled from the
1373  *      outside of clipRect to the inside are NOT painted.
1374  *
1375  */
1376 INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
1377                            const RECT *rect, const RECT *clipRect,
1378                            HRGN hrgnUpdate, LPRECT rcUpdate,
1379                            UINT flags )
1380 {
1381     INT   retVal = NULLREGION;
1382     BOOL  bOwnRgn = TRUE;
1383     BOOL  bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
1384     int rdw_flags;
1385     HRGN  hrgnTemp;
1386     HRGN  hrgnWinupd = 0;
1387     HDC   hDC;
1388     RECT  rc, cliprc;
1389     HWND hwndCaret = NULL;
1390     BOOL moveCaret = FALSE;
1391     POINT newCaretPos;
1392
1393     TRACE( "%p, %d,%d hrgnUpdate=%p rcUpdate = %p %s %04x\n",
1394            hwnd, dx, dy, hrgnUpdate, rcUpdate, wine_dbgstr_rect(rect), flags );
1395     TRACE( "clipRect = %s\n", wine_dbgstr_rect(clipRect));
1396     if( flags & ~( SW_SCROLLCHILDREN | SW_INVALIDATE | SW_ERASE))
1397         FIXME("some flags (%04x) are unhandled\n", flags);
1398
1399     rdw_flags = (flags & SW_ERASE) && (flags & SW_INVALIDATE) ?
1400                                 RDW_INVALIDATE | RDW_ERASE  : RDW_INVALIDATE ;
1401
1402     if (!WIN_IsWindowDrawable( hwnd, TRUE )) return ERROR;
1403     hwnd = WIN_GetFullHandle( hwnd );
1404
1405     GetClientRect(hwnd, &rc);
1406
1407     if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
1408     else cliprc = rc;
1409
1410     if (rect) IntersectRect(&rc, &rc, rect);
1411
1412     if( hrgnUpdate ) bOwnRgn = FALSE;
1413     else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
1414
1415     newCaretPos.x = newCaretPos.y = 0;
1416
1417     if( !IsRectEmpty(&cliprc) && (dx || dy)) {
1418         DWORD dcxflags = DCX_CACHE;
1419         DWORD style = GetWindowLongW( hwnd, GWL_STYLE );
1420
1421         hwndCaret = fix_caret(hwnd, &rc, dx, dy, flags, &moveCaret, &newCaretPos);
1422
1423         if( style & WS_CLIPSIBLINGS) dcxflags |= DCX_CLIPSIBLINGS;
1424         if( GetClassLongW( hwnd, GCL_STYLE ) & CS_PARENTDC)
1425             dcxflags |= DCX_PARENTCLIP;
1426         if( !(flags & SW_SCROLLCHILDREN) && (style & WS_CLIPCHILDREN))
1427             dcxflags |= DCX_CLIPCHILDREN;
1428         hDC = GetDCEx( hwnd, 0, dcxflags);
1429         if (hDC)
1430         {
1431             ScrollDC( hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate );
1432
1433             ReleaseDC( hwnd, hDC );
1434
1435             if (!bUpdate)
1436                 RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags);
1437         }
1438
1439         /* If the windows has an update region, this must be
1440          * scrolled as well. Keep a copy in hrgnWinupd
1441          * to be added to hrngUpdate at the end. */
1442         hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
1443         retVal = GetUpdateRgn( hwnd, hrgnTemp, FALSE );
1444         if (retVal != NULLREGION)
1445         {
1446             HRGN hrgnClip = CreateRectRgnIndirect(&cliprc);
1447             if( !bOwnRgn) {
1448                 hrgnWinupd = CreateRectRgn( 0, 0, 0, 0);
1449                 CombineRgn( hrgnWinupd, hrgnTemp, 0, RGN_COPY);
1450             }
1451             OffsetRgn( hrgnTemp, dx, dy );
1452             CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
1453             if( !bOwnRgn)
1454                 CombineRgn( hrgnWinupd, hrgnWinupd, hrgnTemp, RGN_OR );
1455             RedrawWindow( hwnd, NULL, hrgnTemp, rdw_flags);
1456
1457            /* Catch the case where the scrolling amount exceeds the size of the
1458             * original window. This generated a second update area that is the
1459             * location where the original scrolled content would end up.
1460             * This second region is not returned by the ScrollDC and sets
1461             * ScrollWindowEx apart from just a ScrollDC.
1462             *
1463             * This has been verified with testing on windows.
1464             */
1465             if (abs(dx) > abs(rc.right - rc.left) ||
1466                 abs(dy) > abs(rc.bottom - rc.top))
1467             {
1468                 SetRectRgn( hrgnTemp, rc.left + dx, rc.top + dy, rc.right+dx, rc.bottom + dy);
1469                 CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
1470                 CombineRgn( hrgnUpdate, hrgnUpdate, hrgnTemp, RGN_OR );
1471
1472                 if( !bOwnRgn)
1473                     CombineRgn( hrgnWinupd, hrgnWinupd, hrgnTemp, RGN_OR );
1474             }
1475             DeleteObject( hrgnClip );
1476         }
1477         DeleteObject( hrgnTemp );
1478     } else {
1479         /* nothing was scrolled */
1480         if( !bOwnRgn)
1481             SetRectRgn( hrgnUpdate, 0, 0, 0, 0 );
1482         SetRectEmpty( rcUpdate);
1483     }
1484
1485     if( flags & SW_SCROLLCHILDREN )
1486     {
1487         HWND *list = WIN_ListChildren( hwnd );
1488         if (list)
1489         {
1490             int i;
1491             RECT r, dummy;
1492             for (i = 0; list[i]; i++)
1493             {
1494                 GetWindowRect( list[i], &r );
1495                 MapWindowPoints( 0, hwnd, (POINT *)&r, 2 );
1496                 if (!rect || IntersectRect(&dummy, &r, rect))
1497                     SetWindowPos( list[i], 0, r.left + dx, r.top  + dy, 0, 0,
1498                                   SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
1499                                   SWP_NOREDRAW | SWP_DEFERERASE );
1500             }
1501             HeapFree( GetProcessHeap(), 0, list );
1502         }
1503     }
1504
1505     if( flags & (SW_INVALIDATE | SW_ERASE) )
1506         RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags |
1507                       ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
1508
1509     if( hrgnWinupd) {
1510         CombineRgn( hrgnUpdate, hrgnUpdate, hrgnWinupd, RGN_OR);
1511         DeleteObject( hrgnWinupd);
1512     }
1513
1514     if( hwndCaret ) {
1515         if ( moveCaret ) SetCaretPos( newCaretPos.x, newCaretPos.y );
1516         ShowCaret(hwndCaret);
1517     }
1518
1519     if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
1520
1521     return retVal;
1522 }
1523
1524
1525 /*************************************************************************
1526  *              ScrollWindow (USER32.@)
1527  *
1528  */
1529 BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
1530                           const RECT *rect, const RECT *clipRect )
1531 {
1532     return (ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
1533                                      (rect ? 0 : SW_SCROLLCHILDREN) |
1534                                      SW_INVALIDATE | SW_ERASE ));
1535 }
1536
1537
1538 /*************************************************************************
1539  *              ScrollDC (USER32.@)
1540  *
1541  * dx, dy, lprcScroll and lprcClip are all in logical coordinates (msdn is
1542  * wrong) hrgnUpdate is returned in device coordinates with rcUpdate in
1543  * logical coordinates.
1544  */
1545 BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
1546                       const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
1547
1548 {
1549     return USER_Driver->pScrollDC( hdc, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate );
1550 }
1551
1552 /************************************************************************
1553  *              PrintWindow (USER32.@)
1554  *
1555  */
1556 BOOL WINAPI PrintWindow(HWND hwnd, HDC hdcBlt, UINT nFlags)
1557 {
1558     UINT flags = PRF_CHILDREN | PRF_ERASEBKGND | PRF_OWNED | PRF_CLIENT;
1559     if(!(nFlags & PW_CLIENTONLY))
1560     {
1561         flags |= PRF_NONCLIENT;
1562     }
1563     SendMessageW(hwnd, WM_PRINT, (WPARAM)hdcBlt, flags);
1564     return TRUE;
1565 }