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   1 /*
   2  * USER DCE functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  *           1996,1997 Alex Korobka
   6  *
   7  *
   8  * Note: Visible regions of CS_OWNDC/CS_CLASSDC window DCs
   9  * have to be updated dynamically.
  10  *
  11  * Internal DCX flags:
  12  *
  13  * DCX_DCEEMPTY    - dce is uninitialized
  14  * DCX_DCEBUSY     - dce is in use
  15  * DCX_DCEDIRTY    - ReleaseDC() should wipe instead of caching
  16  * DCX_KEEPCLIPRGN - ReleaseDC() should not delete the clipping region
  17  * DCX_WINDOWPAINT - BeginPaint() is in effect
  18  */
  19
  20 #include <assert.h>
  21 #include "desktop.h"
  22 #include "options.h"
  23 #include "dce.h"
  24 #include "class.h"
  25 #include "win.h"
  26 #include "gdi.h"
  27 #include "region.h"
  28 #include "heap.h"
  29 #include "local.h"
  30 #include "debug.h"
  31 #include "wine/winuser16.h"
  32
  33 DEFAULT_DEBUG_CHANNEL(dc)
  34
  35 #define NB_DCE    5  /* Number of DCEs created at startup */
  36
  37 static DCE *firstDCE = 0;
  38 static HDC defaultDCstate = 0;
  39
  40 static void DCE_DeleteClipRgn( DCE* );
  41 static INT DCE_ReleaseDC( DCE* );
  42
  43
  44 /***********************************************************************
  45  *           DCE_DumpCache
  46  */
  47 static void DCE_DumpCache(void)
  48 {
  49     DCE *dce;
  50
  51     WIN_LockWnds();
  52     dce = firstDCE;
  53
  54     DUMP("DCE:\n");
  55     while( dce )
  56     {
  57         DUMP("\t[0x%08x] hWnd 0x%04x, dcx %08x, %s %s\n",
  58              (unsigned)dce, dce->hwndCurrent, (unsigned)dce->DCXflags,
  59              (dce->DCXflags & DCX_CACHE) ? "Cache" : "Owned",
  60              (dce->DCXflags & DCX_DCEBUSY) ? "InUse" : "" );
  61         dce = dce->next;
  62     }
  63
  64     WIN_UnlockWnds();
  65 }
  66
  67 /***********************************************************************
  68  *           DCE_AllocDCE
  69  *
  70  * Allocate a new DCE.
  71  */
  72 DCE *DCE_AllocDCE( HWND hWnd, DCE_TYPE type )
  73 {
  74     DCE * dce;
  75     WND* wnd;
  76
  77     if (!(dce = HeapAlloc( SystemHeap, 0, sizeof(DCE) ))) return NULL;
  78     if (!(dce->hDC = CreateDC16( "DISPLAY", NULL, NULL, NULL )))
  79     {
  80         HeapFree( SystemHeap, 0, dce );
  81         return 0;
  82     }
  83
  84     wnd = WIN_FindWndPtr(hWnd);
  85
  86     /* store DCE handle in DC hook data field */
  87
  88     SetDCHook( dce->hDC, (FARPROC16)DCHook16, (DWORD)dce );
  89
  90     dce->hwndCurrent = hWnd;
  91     dce->hClipRgn    = 0;
  92     dce->next        = firstDCE;
  93     firstDCE = dce;
  94
  95     if( type != DCE_CACHE_DC ) /* owned or class DC */
  96     {
  97         dce->DCXflags = DCX_DCEBUSY;
  98         if( hWnd )
  99         {
 100             if( wnd->dwStyle & WS_CLIPCHILDREN ) dce->DCXflags |= DCX_CLIPCHILDREN;
 101             if( wnd->dwStyle & WS_CLIPSIBLINGS ) dce->DCXflags |= DCX_CLIPSIBLINGS;
 102         }
 103         SetHookFlags16(dce->hDC,DCHF_INVALIDATEVISRGN);
 104     }
 105     else dce->DCXflags = DCX_CACHE | DCX_DCEEMPTY;
 106
 107     WIN_ReleaseWndPtr(wnd);
 108
 109     return dce;
 110 }
 111
 112
 113 /***********************************************************************
 114  *           DCE_FreeDCE
 115  */
 116 DCE* DCE_FreeDCE( DCE *dce )
 117 {
 118     DCE **ppDCE;
 119
 120     if (!dce) return NULL;
 121
 122     WIN_LockWnds();
 123
 124     ppDCE = &firstDCE;
 125
 126     while (*ppDCE && (*ppDCE != dce)) ppDCE = &(*ppDCE)->next;
 127     if (*ppDCE == dce) *ppDCE = dce->next;
 128
 129     SetDCHook(dce->hDC, NULL, 0L);
 130
 131     DeleteDC( dce->hDC );
 132     if( dce->hClipRgn && !(dce->DCXflags & DCX_KEEPCLIPRGN) )
 133         DeleteObject(dce->hClipRgn);
 134     HeapFree( SystemHeap, 0, dce );
 135
 136     WIN_UnlockWnds();
 137
 138     return *ppDCE;
 139 }
 140
 141 /***********************************************************************
 142  *           DCE_FreeWindowDCE
 143  *
 144  * Remove owned DCE and reset unreleased cache DCEs.
 145  */
 146 void DCE_FreeWindowDCE( WND* pWnd )
 147 {
 148     DCE *pDCE;
 149
 150     WIN_LockWnds();
 151     pDCE = firstDCE;
 152
 153     while( pDCE )
 154     {
 155         if( pDCE->hwndCurrent == pWnd->hwndSelf )
 156         {
 157             if( pDCE == pWnd->dce ) /* owned DCE */
 158             {
 159                 pDCE = DCE_FreeDCE( pDCE );
 160                 pWnd->dce = NULL;
 161                 continue;
 162             }
 163             else
 164             {
 165                 if(!(pDCE->DCXflags & DCX_CACHE) ) /* class DCE */
 166                 {
 167                     if( pDCE->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN) )
 168                         DCE_DeleteClipRgn( pDCE );
 169                 }
 170                 else if( pDCE->DCXflags & DCX_DCEBUSY ) /* shared cache DCE */
 171                 {
 172                     ERR(dc,"[%04x] GetDC() without ReleaseDC()!\n",
 173                         pWnd->hwndSelf);
 174                     DCE_ReleaseDC( pDCE );
 175                 }
 176
 177                 pDCE->DCXflags &= DCX_CACHE;
 178                 pDCE->DCXflags |= DCX_DCEEMPTY;
 179                 pDCE->hwndCurrent = 0;
 180             }
 181         }
 182         pDCE = pDCE->next;
 183     }
 184
 185     WIN_UnlockWnds();
 186 }
 187
 188
 189 /***********************************************************************
 190  *   DCE_DeleteClipRgn
 191  */
 192 static void DCE_DeleteClipRgn( DCE* dce )
 193 {
 194     dce->DCXflags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN | DCX_WINDOWPAINT);
 195
 196     if( dce->DCXflags & DCX_KEEPCLIPRGN )
 197         dce->DCXflags &= ~DCX_KEEPCLIPRGN;
 198     else
 199         if( dce->hClipRgn > 1 )
 200             DeleteObject( dce->hClipRgn );
 201
 202     dce->hClipRgn = 0;
 203
 204     TRACE(dc,"\trestoring VisRgn\n");
 205
 206     RestoreVisRgn16(dce->hDC);
 207 }
 208
 209
 210 /***********************************************************************
 211  *   DCE_ReleaseDC
 212  */
 213 static INT DCE_ReleaseDC( DCE* dce )
 214 {
 215     if ((dce->DCXflags & (DCX_DCEEMPTY | DCX_DCEBUSY)) != DCX_DCEBUSY) return 0;
 216
 217     /* restore previous visible region */
 218
 219     if ((dce->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) &&
 220         (dce->DCXflags & (DCX_CACHE | DCX_WINDOWPAINT)) )
 221         DCE_DeleteClipRgn( dce );
 222
 223     if (dce->DCXflags & DCX_CACHE)
 224     {
 225         SetDCState16( dce->hDC, defaultDCstate );
 226         dce->DCXflags &= ~DCX_DCEBUSY;
 227         if (dce->DCXflags & DCX_DCEDIRTY)
 228         {
 229             /* don't keep around invalidated entries
 230              * because SetDCState() disables hVisRgn updates
 231              * by removing dirty bit. */
 232
 233             dce->hwndCurrent = 0;
 234             dce->DCXflags &= DCX_CACHE;
 235             dce->DCXflags |= DCX_DCEEMPTY;
 236         }
 237     }
 238     return 1;
 239 }
 240
 241
 242 /***********************************************************************
 243  *   DCE_InvalidateDCE
 244  *
 245  * It is called from SetWindowPos() - we have to mark as dirty all busy
 246  * DCEs for windows that have pWnd->parent as an ansector and whose client
 247  * rect intersects with specified update rectangle. In addition, pWnd->parent
 248  * DCEs may need to be updated if DCX_CLIPCHILDREN flag is set.
 249  */
 250 BOOL DCE_InvalidateDCE(WND* pWnd, const RECT* pRectUpdate)
 251 {
 252     WND* wndScope = WIN_LockWndPtr(pWnd->parent);
 253     WND *pDesktop = WIN_GetDesktop();
 254     BOOL bRet = FALSE;
 255
 256     if( wndScope )
 257     {
 258         DCE *dce;
 259
 260         TRACE(dc,"scope hwnd = %04x, (%i,%i - %i,%i)\n",
 261                      wndScope->hwndSelf, pRectUpdate->left,pRectUpdate->top,
 262                      pRectUpdate->right,pRectUpdate->bottom);
 263         if(TRACE_ON(dc))
 264           DCE_DumpCache();
 265
 266         /* walk all DCEs and fixup non-empty entries */
 267
 268         for (dce = firstDCE; (dce); dce = dce->next)
 269         {
 270             if( !(dce->DCXflags & DCX_DCEEMPTY) )
 271             {
 272                 WND* wndCurrent = WIN_FindWndPtr(dce->hwndCurrent);
 273
 274                 if( wndCurrent )
 275                 {
 276                     WND* wnd = NULL;
 277                     INT xoffset = 0, yoffset = 0;
 278
 279                     if( (wndCurrent == wndScope) && !(dce->DCXflags & DCX_CLIPCHILDREN) )
 280                     {
 281                         /* child window positions don't bother us */
 282                         WIN_ReleaseWndPtr(wndCurrent);
 283                         continue;
 284                     }
 285
 286                     if( !Options.desktopGeometry && wndCurrent == pDesktop )
 287                     {
 288                         /* don't bother with fake desktop */
 289                         WIN_ReleaseWndPtr(wndCurrent);
 290                         continue;
 291                     }
 292
 293                     /* check if DCE window is within the z-order scope */
 294
 295                     for( wnd = WIN_LockWndPtr(wndCurrent); wnd; WIN_UpdateWndPtr(&wnd,wnd->parent))
 296                     {
 297                         if( wnd == wndScope )
 298                         {
 299                             RECT wndRect;
 300
 301                             wndRect = wndCurrent->rectWindow;
 302
 303                             OffsetRect( &wndRect, xoffset - wndCurrent->rectClient.left,
 304                                                     yoffset - wndCurrent->rectClient.top);
 305
 306                             if (pWnd == wndCurrent ||
 307                                 IntersectRect( &wndRect, &wndRect, pRectUpdate ))
 308                             {
 309                                 if( !(dce->DCXflags & DCX_DCEBUSY) )
 310                                 {
 311                                     /* Don't bother with visible regions of unused DCEs */
 312
 313                                     TRACE(dc,"\tpurged %08x dce [%04x]\n",
 314                                                 (unsigned)dce, wndCurrent->hwndSelf);
 315
 316                                     dce->hwndCurrent = 0;
 317                                     dce->DCXflags &= DCX_CACHE;
 318                                     dce->DCXflags |= DCX_DCEEMPTY;
 319                                 }
 320                                 else
 321                                 {
 322                                     /* Set dirty bits in the hDC and DCE structs */
 323
 324                                     TRACE(dc,"\tfixed up %08x dce [%04x]\n",
 325                                                 (unsigned)dce, wndCurrent->hwndSelf);
 326
 327                                     dce->DCXflags |= DCX_DCEDIRTY;
 328                                     SetHookFlags16(dce->hDC, DCHF_INVALIDATEVISRGN);
 329                                     bRet = TRUE;
 330                                 }
 331                             }
 332                             WIN_ReleaseWndPtr(wnd);
 333                             break;
 334                         }
 335                         xoffset += wnd->rectClient.left;
 336                         yoffset += wnd->rectClient.top;
 337                     }
 338                 }
 339                 WIN_ReleaseWndPtr(wndCurrent);
 340             }
 341         } /* dce list */
 342         WIN_ReleaseWndPtr(wndScope);
 343     }
 344     WIN_ReleaseDesktop();
 345     return bRet;
 346 }
 347
 348 /***********************************************************************
 349  *           DCE_Init
 350  */
 351 void DCE_Init(void)
 352 {
 353     int i;
 354     DCE * dce;
 355
 356     for (i = 0; i < NB_DCE; i++)
 357     {
 358         if (!(dce = DCE_AllocDCE( 0, DCE_CACHE_DC ))) return;
 359         if (!defaultDCstate) defaultDCstate = GetDCState16( dce->hDC );
 360     }
 361 }
 362
 363
 364 /***********************************************************************
 365  *           DCE_GetVisRect
 366  *
 367  * Calculate the visible rectangle of a window (i.e. the client or
 368  * window area clipped by the client area of all ancestors) in the
 369  * corresponding coordinates. Return FALSE if the visible region is empty.
 370  */
 371 static BOOL DCE_GetVisRect( WND *wndPtr, BOOL clientArea, RECT *lprect )
 372 {
 373     *lprect = clientArea ? wndPtr->rectClient : wndPtr->rectWindow;
 374
 375     if (wndPtr->dwStyle & WS_VISIBLE)
 376     {
 377         INT xoffset = lprect->left;
 378         INT yoffset = lprect->top;
 379
 380         while( !(wndPtr->flags & WIN_NATIVE) )
 381         {
 382             wndPtr = WIN_LockWndPtr(wndPtr->parent);
 383
 384             if ( (wndPtr->dwStyle & (WS_ICONIC | WS_VISIBLE)) != WS_VISIBLE )
 385             {
 386                 WIN_ReleaseWndPtr(wndPtr);
 387                 goto fail;
 388             }
 389
 390             xoffset += wndPtr->rectClient.left;
 391             yoffset += wndPtr->rectClient.top;
 392             OffsetRect( lprect, wndPtr->rectClient.left,
 393                                   wndPtr->rectClient.top );
 394
 395             if( (wndPtr->rectClient.left >= wndPtr->rectClient.right) ||
 396                 (wndPtr->rectClient.top >= wndPtr->rectClient.bottom) ||
 397                 (lprect->left >= wndPtr->rectClient.right) ||
 398                 (lprect->right <= wndPtr->rectClient.left) ||
 399                 (lprect->top >= wndPtr->rectClient.bottom) ||
 400                 (lprect->bottom <= wndPtr->rectClient.top) )
 401             {
 402                 WIN_ReleaseWndPtr(wndPtr);
 403                 goto fail;
 404             }
 405
 406             lprect->left = MAX( lprect->left, wndPtr->rectClient.left );
 407             lprect->right = MIN( lprect->right, wndPtr->rectClient.right );
 408             lprect->top = MAX( lprect->top, wndPtr->rectClient.top );
 409             lprect->bottom = MIN( lprect->bottom, wndPtr->rectClient.bottom );
 410
 411             WIN_ReleaseWndPtr(wndPtr);
 412         }
 413         OffsetRect( lprect, -xoffset, -yoffset );
 414         return TRUE;
 415     }
 416
 417 fail:
 418     SetRectEmpty( lprect );
 419     return FALSE;
 420 }
 421
 422
 423 /***********************************************************************
 424  *           DCE_AddClipRects
 425  *
 426  * Go through the linked list of windows from pWndStart to pWndEnd,
 427  * adding to the clip region the intersection of the target rectangle
 428  * with an offset window rectangle.
 429  */
 430 static BOOL DCE_AddClipRects( WND *pWndStart, WND *pWndEnd,
 431                                 HRGN hrgnClip, LPRECT lpRect, int x, int y )
 432 {
 433     RECT rect;
 434
 435     if( pWndStart->pDriver->pIsSelfClipping( pWndStart ) )
 436         return TRUE; /* The driver itself will do the clipping */
 437
 438     for (WIN_LockWndPtr(pWndStart); pWndStart != pWndEnd; WIN_UpdateWndPtr(&pWndStart,pWndStart->next))
 439     {
 440         if( !(pWndStart->dwStyle & WS_VISIBLE) ) continue;
 441
 442         rect.left = pWndStart->rectWindow.left + x;
 443         rect.top = pWndStart->rectWindow.top + y;
 444         rect.right = pWndStart->rectWindow.right + x;
 445         rect.bottom = pWndStart->rectWindow.bottom + y;
 446
 447         if( IntersectRect( &rect, &rect, lpRect ))
 448         {
 449             if(!REGION_UnionRectWithRgn( hrgnClip, &rect )) break;
 450         }
 451     }
 452     WIN_ReleaseWndPtr(pWndStart);
 453     return (pWndStart == pWndEnd);
 454 }
 455
 456
 457 /***********************************************************************
 458  *           DCE_GetVisRgn
 459  *
 460  * Return the visible region of a window, i.e. the client or window area
 461  * clipped by the client area of all ancestors, and then optionally
 462  * by siblings and children.
 463  */
 464 HRGN DCE_GetVisRgn( HWND hwnd, WORD flags, HWND hwndChild, WORD cflags )
 465 {
 466     HRGN hrgnVis = 0;
 467     RECT rect;
 468     WND *wndPtr = WIN_FindWndPtr( hwnd );
 469     WND *childWnd = WIN_FindWndPtr( hwndChild );
 470
 471     /* Get visible rectangle and create a region with it. */
 472
 473     if (wndPtr && DCE_GetVisRect(wndPtr, !(flags & DCX_WINDOW), &rect))
 474     {
 475         if((hrgnVis = CreateRectRgnIndirect( &rect )))
 476         {
 477             HRGN hrgnClip = CreateRectRgn( 0, 0, 0, 0 );
 478             INT xoffset, yoffset;
 479
 480             if( hrgnClip )
 481             {
 482                 /* Compute obscured region for the visible rectangle by
 483                  * clipping children, siblings, and ancestors. Note that
 484                  * DCE_GetVisRect() returns a rectangle either in client
 485                  * or in window coordinates (for DCX_WINDOW request). */
 486
 487                 if( (flags & DCX_CLIPCHILDREN) && wndPtr->child )
 488                 {
 489                     if( flags & DCX_WINDOW )
 490                     {
 491                         /* adjust offsets since child window rectangles are
 492                          * in client coordinates */
 493
 494                         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 495                         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 496                     }
 497                     else
 498                         xoffset = yoffset = 0;
 499
 500                     DCE_AddClipRects( wndPtr->child, NULL, hrgnClip,
 501                                       &rect, xoffset, yoffset );
 502                 }
 503
 504                 /* We may need to clip children of child window, if a window with PARENTDC
 505                  * class style and CLIPCHILDREN window style (like in Free Agent 16
 506                  * preference dialogs) gets here, we take the region for the parent window
 507                  * but apparently still need to clip the children of the child window... */
 508
 509                 if( (cflags & DCX_CLIPCHILDREN) && childWnd && childWnd->child )
 510                 {
 511                     if( flags & DCX_WINDOW )
 512                     {
 513                         /* adjust offsets since child window rectangles are
 514                          * in client coordinates */
 515
 516                         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 517                         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 518                     }
 519                     else
 520                         xoffset = yoffset = 0;
 521
 522                     /* client coordinates of child window */
 523                     xoffset += childWnd->rectClient.left;
 524                     yoffset += childWnd->rectClient.top;
 525
 526                     DCE_AddClipRects( childWnd->child, NULL, hrgnClip,
 527                                       &rect, xoffset, yoffset );
 528                 }
 529
 530                 /* sibling window rectangles are in client
 531                  * coordinates of the parent window */
 532
 533                 if (flags & DCX_WINDOW)
 534                 {
 535                     xoffset = -wndPtr->rectWindow.left;
 536                     yoffset = -wndPtr->rectWindow.top;
 537                 }
 538                 else
 539                 {
 540                     xoffset = -wndPtr->rectClient.left;
 541                     yoffset = -wndPtr->rectClient.top;
 542                 }
 543
 544                 if (flags & DCX_CLIPSIBLINGS && wndPtr->parent )
 545                     DCE_AddClipRects( wndPtr->parent->child,
 546                                       wndPtr, hrgnClip, &rect, xoffset, yoffset );
 547
 548                 /* Clip siblings of all ancestors that have the
 549                  * WS_CLIPSIBLINGS style
 550                  */
 551
 552                 while (wndPtr->dwStyle & WS_CHILD)
 553                 {
 554                     WIN_UpdateWndPtr(&wndPtr,wndPtr->parent);
 555                     xoffset -= wndPtr->rectClient.left;
 556                     yoffset -= wndPtr->rectClient.top;
 557                     if(wndPtr->dwStyle & WS_CLIPSIBLINGS && wndPtr->parent)
 558                     {
 559                         DCE_AddClipRects( wndPtr->parent->child, wndPtr,
 560                                           hrgnClip, &rect, xoffset, yoffset );
 561                     }
 562                 }
 563
 564                 /* Now once we've got a jumbo clip region we have
 565                  * to substract it from the visible rectangle.
 566                  */
 567
 568                 CombineRgn( hrgnVis, hrgnVis, hrgnClip, RGN_DIFF );
 569                 DeleteObject( hrgnClip );
 570             }
 571             else
 572             {
 573                 DeleteObject( hrgnVis );
 574                 hrgnVis = 0;
 575             }
 576         }
 577     }
 578     else
 579         hrgnVis = CreateRectRgn(0, 0, 0, 0); /* empty */
 580     WIN_ReleaseWndPtr(wndPtr);
 581     WIN_ReleaseWndPtr(childWnd);
 582     return hrgnVis;
 583 }
 584
 585 /***********************************************************************
 586  *           DCE_OffsetVisRgn
 587  *
 588  * Change region from DC-origin relative coordinates to screen coords.
 589  */
 590
 591 static void DCE_OffsetVisRgn( HDC hDC, HRGN hVisRgn )
 592 {
 593     DC *dc;
 594     if (!(dc = (DC *) GDI_GetObjPtr( hDC, DC_MAGIC ))) return;
 595
 596     OffsetRgn( hVisRgn, dc->w.DCOrgX, dc->w.DCOrgY );
 597
 598     GDI_HEAP_UNLOCK( hDC );
 599 }
 600
 601 /***********************************************************************
 602  *           DCE_ExcludeRgn
 603  *
 604  *  Translate given region from the wnd client to the DC coordinates
 605  *  and add it to the clipping region.
 606  */
 607 INT16 DCE_ExcludeRgn( HDC hDC, WND* wnd, HRGN hRgn )
 608 {
 609   POINT  pt = {0, 0};
 610   DCE     *dce = firstDCE;
 611
 612   while (dce && (dce->hDC != hDC)) dce = dce->next;
 613   if( dce )
 614   {
 615       MapWindowPoints( wnd->hwndSelf, dce->hwndCurrent, &pt, 1);
 616       if( dce->DCXflags & DCX_WINDOW )
 617       {
 618           wnd = WIN_FindWndPtr(dce->hwndCurrent);
 619           pt.x += wnd->rectClient.left - wnd->rectWindow.left;
 620           pt.y += wnd->rectClient.top - wnd->rectWindow.top;
 621           WIN_ReleaseWndPtr(wnd);
 622       }
 623   }
 624   else return ERROR;
 625   OffsetRgn(hRgn, pt.x, pt.y);
 626
 627   return ExtSelectClipRgn( hDC, hRgn, RGN_DIFF );
 628 }
 629
 630
 631 /***********************************************************************
 632  *           GetDCEx16    (USER.359)
 633  */
 634 HDC16 WINAPI GetDCEx16( HWND16 hwnd, HRGN16 hrgnClip, DWORD flags )
 635 {
 636     return (HDC16)GetDCEx( hwnd, hrgnClip, flags );
 637 }
 638
 639
 640 /***********************************************************************
 641  *           GetDCEx32    (USER32.231)
 642  *
 643  * Unimplemented flags: DCX_LOCKWINDOWUPDATE
 644  *
 645  * FIXME: Full support for hrgnClip == 1 (alias for entire window).
 646  */
 647 HDC WINAPI GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags )
 648 {
 649     HRGN        hrgnVisible = 0;
 650     HDC         hdc = 0;
 651     DCE *       dce;
 652     DC *        dc;
 653     WND *       wndPtr;
 654     DWORD       dcxFlags = 0;
 655     BOOL        bUpdateVisRgn = TRUE;
 656     BOOL        bUpdateClipOrigin = FALSE;
 657
 658     TRACE(dc,"hwnd %04x, hrgnClip %04x, flags %08x\n",
 659                                 hwnd, hrgnClip, (unsigned)flags);
 660
 661     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 662
 663     /* fixup flags */
 664
 665     if (!(wndPtr->class->style & (CS_OWNDC | CS_CLASSDC))) flags |= DCX_CACHE;
 666
 667     if (flags & DCX_USESTYLE)
 668     {
 669         flags &= ~( DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP);
 670
 671         if( wndPtr->dwStyle & WS_CLIPSIBLINGS )
 672             flags |= DCX_CLIPSIBLINGS;
 673
 674         if ( !(flags & DCX_WINDOW) )
 675         {
 676             if (wndPtr->class->style & CS_PARENTDC) flags |= DCX_PARENTCLIP;
 677
 678             if (wndPtr->dwStyle & WS_CLIPCHILDREN &&
 679                      !(wndPtr->dwStyle & WS_MINIMIZE) ) flags |= DCX_CLIPCHILDREN;
 680         }
 681         else flags |= DCX_CACHE;
 682     }
 683
 684     if( flags & DCX_NOCLIPCHILDREN )
 685     {
 686         flags |= DCX_CACHE;
 687         flags &= ~(DCX_PARENTCLIP | DCX_CLIPCHILDREN);
 688     }
 689
 690     if (flags & DCX_WINDOW)
 691         flags = (flags & ~DCX_CLIPCHILDREN) | DCX_CACHE;
 692
 693     if (!(wndPtr->dwStyle & WS_CHILD) || !wndPtr->parent )
 694         flags &= ~DCX_PARENTCLIP;
 695     else if( flags & DCX_PARENTCLIP )
 696     {
 697         flags |= DCX_CACHE;
 698         if( !(flags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN)) )
 699             if( (wndPtr->dwStyle & WS_VISIBLE) && (wndPtr->parent->dwStyle & WS_VISIBLE) )
 700             {
 701                 flags &= ~DCX_CLIPCHILDREN;
 702                 if( wndPtr->parent->dwStyle & WS_CLIPSIBLINGS )
 703                     flags |= DCX_CLIPSIBLINGS;
 704             }
 705     }
 706
 707     /* find a suitable DCE */
 708
 709     dcxFlags = flags & (DCX_PARENTCLIP | DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN |
 710                         DCX_CACHE | DCX_WINDOW);
 711
 712     if (flags & DCX_CACHE)
 713     {
 714         DCE*    dceEmpty;
 715         DCE*    dceUnused;
 716
 717         dceEmpty = dceUnused = NULL;
 718
 719         /* Strategy: First, we attempt to find a non-empty but unused DCE with
 720          * compatible flags. Next, we look for an empty entry. If the cache is
 721          * full we have to purge one of the unused entries.
 722          */
 723
 724         for (dce = firstDCE; (dce); dce = dce->next)
 725         {
 726             if ((dce->DCXflags & (DCX_CACHE | DCX_DCEBUSY)) == DCX_CACHE )
 727             {
 728                 dceUnused = dce;
 729
 730                 if (dce->DCXflags & DCX_DCEEMPTY)
 731                     dceEmpty = dce;
 732                 else
 733                 if ((dce->hwndCurrent == hwnd) &&
 734                    ((dce->DCXflags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN |
 735                                       DCX_CACHE | DCX_WINDOW | DCX_PARENTCLIP)) == dcxFlags))
 736                 {
 737                     TRACE(dc,"\tfound valid %08x dce [%04x], flags %08x\n",
 738                                         (unsigned)dce, hwnd, (unsigned)dcxFlags );
 739                     bUpdateVisRgn = FALSE;
 740                     bUpdateClipOrigin = TRUE;
 741                     break;
 742                 }
 743             }
 744         }
 745
 746         if (!dce) dce = (dceEmpty) ? dceEmpty : dceUnused;
 747
 748         /* if there's no dce empty or unused, allocate a new one */
 749         if (!dce)
 750         {
 751             dce = DCE_AllocDCE( 0, DCE_CACHE_DC );
 752         }
 753     }
 754     else
 755     {
 756         dce = (wndPtr->class->style & CS_OWNDC) ? wndPtr->dce : wndPtr->class->dce;
 757         if( dce->hwndCurrent == hwnd )
 758         {
 759             TRACE(dc,"\tskipping hVisRgn update\n");
 760             bUpdateVisRgn = FALSE; /* updated automatically, via DCHook() */
 761
 762             if( (dce->DCXflags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN)) &&
 763                 (flags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN)) )
 764             {
 765                 /* This is likely to be a nested BeginPaint(). */
 766
 767                 if( dce->hClipRgn != hrgnClip )
 768                 {
 769                     FIXME(dc,"new hrgnClip[%04x] smashes the previous[%04x]\n",
 770                           hrgnClip, dce->hClipRgn );
 771                     DCE_DeleteClipRgn( dce );
 772                 }
 773                 else
 774                     RestoreVisRgn16(dce->hDC);
 775             }
 776         }
 777     }
 778     if (!dce)
 779     {
 780         hdc = 0;
 781         goto END;
 782     }
 783
 784     dce->hwndCurrent = hwnd;
 785     dce->hClipRgn = 0;
 786     dce->DCXflags = dcxFlags | (flags & DCX_WINDOWPAINT) | DCX_DCEBUSY;
 787     hdc = dce->hDC;
 788
 789     if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC )))
 790     {
 791         hdc = 0;
 792         goto END;
 793     }
 794     bUpdateVisRgn = bUpdateVisRgn || (dc->w.flags & DC_DIRTY);
 795
 796     /* recompute visible region */
 797
 798     wndPtr->pDriver->pSetDrawable( wndPtr, dc, flags, bUpdateClipOrigin );
 799     if( bUpdateVisRgn )
 800     {
 801         TRACE(dc,"updating visrgn for %08x dce, hwnd [%04x]\n", (unsigned)dce, hwnd);
 802
 803         if (flags & DCX_PARENTCLIP)
 804         {
 805             WND *parentPtr = WIN_LockWndPtr(wndPtr->parent);
 806
 807             if( wndPtr->dwStyle & WS_VISIBLE && !(parentPtr->dwStyle & WS_MINIMIZE) )
 808             {
 809                 if( parentPtr->dwStyle & WS_CLIPSIBLINGS )
 810                     dcxFlags = DCX_CLIPSIBLINGS | (flags & ~(DCX_CLIPCHILDREN | DCX_WINDOW));
 811                 else
 812                     dcxFlags = flags & ~(DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | DCX_WINDOW);
 813
 814                 hrgnVisible = DCE_GetVisRgn( parentPtr->hwndSelf, dcxFlags,
 815                                              wndPtr->hwndSelf, flags );
 816                 if( flags & DCX_WINDOW )
 817                     OffsetRgn( hrgnVisible, -wndPtr->rectWindow.left,
 818                                               -wndPtr->rectWindow.top );
 819                 else
 820                     OffsetRgn( hrgnVisible, -wndPtr->rectClient.left,
 821                                               -wndPtr->rectClient.top );
 822                 DCE_OffsetVisRgn( hdc, hrgnVisible );
 823             }
 824             else
 825                 hrgnVisible = CreateRectRgn( 0, 0, 0, 0 );
 826             WIN_ReleaseWndPtr(parentPtr);
 827         }
 828         else
 829             if ((hwnd == GetDesktopWindow()) && !DESKTOP_IsSingleWindow())
 830                  hrgnVisible = CreateRectRgn( 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN) );
 831             else
 832             {
 833                 hrgnVisible = DCE_GetVisRgn( hwnd, flags, 0, 0 );
 834                 DCE_OffsetVisRgn( hdc, hrgnVisible );
 835             }
 836
 837         dc->w.flags &= ~DC_DIRTY;
 838         dce->DCXflags &= ~DCX_DCEDIRTY;
 839         SelectVisRgn16( hdc, hrgnVisible );
 840     }
 841     else
 842         TRACE(dc,"no visrgn update %08x dce, hwnd [%04x]\n", (unsigned)dce, hwnd);
 843
 844     /* apply additional region operation (if any) */
 845
 846     if( flags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN) )
 847     {
 848         if( !hrgnVisible ) hrgnVisible = CreateRectRgn( 0, 0, 0, 0 );
 849
 850         dce->DCXflags |= flags & (DCX_KEEPCLIPRGN | DCX_INTERSECTRGN | DCX_EXCLUDERGN);
 851         dce->hClipRgn = hrgnClip;
 852
 853         TRACE(dc, "\tsaved VisRgn, clipRgn = %04x\n", hrgnClip);
 854
 855         SaveVisRgn16( hdc );
 856         CombineRgn( hrgnVisible, hrgnClip, 0, RGN_COPY );
 857         DCE_OffsetVisRgn( hdc, hrgnVisible );
 858         CombineRgn( hrgnVisible, InquireVisRgn16( hdc ), hrgnVisible,
 859                       (flags & DCX_INTERSECTRGN) ? RGN_AND : RGN_DIFF );
 860         SelectVisRgn16( hdc, hrgnVisible );
 861     }
 862
 863     if( hrgnVisible ) DeleteObject( hrgnVisible );
 864
 865     TRACE(dc, "(%04x,%04x,0x%lx): returning %04x\n",
 866                hwnd, hrgnClip, flags, hdc);
 867 END:
 868     WIN_ReleaseWndPtr(wndPtr);
 869     return hdc;
 870 }
 871
 872
 873 /***********************************************************************
 874  *           GetDC16    (USER.66)
 875  */
 876 HDC16 WINAPI GetDC16( HWND16 hwnd )
 877 {
 878     return (HDC16)GetDC( hwnd );
 879 }
 880
 881
 882 /***********************************************************************
 883  *           GetDC32    (USER32.230)
 884  * RETURNS
 885  *      :Handle to DC
 886  *      NULL: Failure
 887  */
 888 HDC WINAPI GetDC(
 889              HWND hwnd /* handle of window */
 890 ) {
 891     if (!hwnd)
 892         return GetDCEx( GetDesktopWindow(), 0, DCX_CACHE | DCX_WINDOW );
 893     return GetDCEx( hwnd, 0, DCX_USESTYLE );
 894 }
 895
 896
 897 /***********************************************************************
 898  *           GetWindowDC16    (USER.67)
 899  */
 900 HDC16 WINAPI GetWindowDC16( HWND16 hwnd )
 901 {
 902     if (!hwnd) hwnd = GetDesktopWindow16();
 903     return GetDCEx16( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
 904 }
 905
 906
 907 /***********************************************************************
 908  *           GetWindowDC32    (USER32.304)
 909  */
 910 HDC WINAPI GetWindowDC( HWND hwnd )
 911 {
 912     if (!hwnd) hwnd = GetDesktopWindow();
 913     return GetDCEx( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
 914 }
 915
 916
 917 /***********************************************************************
 918  *           ReleaseDC16    (USER.68)
 919  */
 920 INT16 WINAPI ReleaseDC16( HWND16 hwnd, HDC16 hdc )
 921 {
 922     return (INT16)ReleaseDC( hwnd, hdc );
 923 }
 924
 925
 926 /***********************************************************************
 927  *           ReleaseDC32    (USER32.440)
 928  *
 929  * RETURNS
 930  *      1: Success
 931  *      0: Failure
 932  */
 933 INT WINAPI ReleaseDC(
 934              HWND hwnd /* Handle of window - ignored */,
 935              HDC hdc   /* Handle of device context */
 936 ) {
 937     DCE * dce;
 938     INT nRet = 0;
 939
 940     WIN_LockWnds();
 941     dce = firstDCE;
 942
 943     TRACE(dc, "%04x %04x\n", hwnd, hdc );
 944
 945     while (dce && (dce->hDC != hdc)) dce = dce->next;
 946
 947     if ( dce )
 948         if ( dce->DCXflags & DCX_DCEBUSY )
 949             nRet = DCE_ReleaseDC( dce );
 950
 951     WIN_UnlockWnds();
 952
 953     return nRet;
 954 }
 955
 956 /***********************************************************************
 957  *           DCHook    (USER.362)
 958  *
 959  * See "Undoc. Windows" for hints (DC, SetDCHook, SetHookFlags)..
 960  */
 961 BOOL16 WINAPI DCHook16( HDC16 hDC, WORD code, DWORD data, LPARAM lParam )
 962 {
 963     BOOL retv = TRUE;
 964     HRGN hVisRgn;
 965     DCE *dce = (DCE *)data;
 966     DC  *dc;
 967     WND *wndPtr;
 968
 969     TRACE(dc,"hDC = %04x, %i\n", hDC, code);
 970
 971     if (!dce) return 0;
 972     assert(dce->hDC == hDC);
 973
 974     /* Grab the windows lock before doing anything else  */
 975     WIN_LockWnds();
 976
 977     switch( code )
 978     {
 979       case DCHC_INVALIDVISRGN:
 980
 981            /* GDI code calls this when it detects that the
 982             * DC is dirty (usually after SetHookFlags()). This
 983             * means that we have to recompute the visible region.
 984             */
 985
 986            if( dce->DCXflags & DCX_DCEBUSY )
 987            {
 988
 989                /* Update stale DC in DCX */
 990                wndPtr = WIN_FindWndPtr( dce->hwndCurrent);
 991                dc = (DC *) GDI_GetObjPtr( dce->hDC, DC_MAGIC);
 992                if( dc && wndPtr)
 993                  wndPtr->pDriver->pSetDrawable( wndPtr, dc,dce->DCXflags,TRUE);
 994
 995                SetHookFlags16(hDC, DCHF_VALIDATEVISRGN);
 996                hVisRgn = DCE_GetVisRgn(dce->hwndCurrent, dce->DCXflags, 0, 0);
 997
 998                TRACE(dc,"\tapplying saved clipRgn\n");
 999
1000                /* clip this region with saved clipping region */
1001
1002                if ( (dce->DCXflags & DCX_INTERSECTRGN && dce->hClipRgn != 1) ||
1003                   (  dce->DCXflags & DCX_EXCLUDERGN && dce->hClipRgn) )
1004                {
1005
1006                     if( (!dce->hClipRgn && dce->DCXflags & DCX_INTERSECTRGN) ||
1007                          (dce->hClipRgn == 1 && dce->DCXflags & DCX_EXCLUDERGN) )
1008                          SetRectRgn(hVisRgn,0,0,0,0);
1009                     else
1010                          CombineRgn(hVisRgn, hVisRgn, dce->hClipRgn,
1011                                       (dce->DCXflags & DCX_EXCLUDERGN)? RGN_DIFF:RGN_AND);
1012                }
1013                dce->DCXflags &= ~DCX_DCEDIRTY;
1014                DCE_OffsetVisRgn( hDC, hVisRgn );
1015                SelectVisRgn16(hDC, hVisRgn);
1016                DeleteObject( hVisRgn );
1017               WIN_ReleaseWndPtr( wndPtr );  /* Release WIN_FindWndPtr lock */
1018            }
1019            else /* non-fatal but shouldn't happen */
1020              WARN(dc, "DC is not in use!\n");
1021            break;
1022
1023       case DCHC_DELETEDC:
1024            /*
1025             * Windows will not let you delete a DC that is busy
1026             * (between GetDC and ReleaseDC)
1027             */
1028
1029            if ( dce->DCXflags & DCX_DCEBUSY )
1030            {
1031                WARN(dc, "Application trying to delete a busy DC\n");
1032                retv = FALSE;
1033            }
1034            break;
1035
1036       default:
1037            FIXME(dc,"unknown code\n");
1038     }
1039
1040   WIN_UnlockWnds();  /* Release the wnd lock */
1041   return retv;
1042 }
1043
1044
1045 /**********************************************************************
1046  *          WindowFromDC16   (USER.117)
1047  */
1048 HWND16 WINAPI WindowFromDC16( HDC16 hDC )
1049 {
1050     return (HWND16)WindowFromDC( hDC );
1051 }
1052
1053
1054 /**********************************************************************
1055  *          WindowFromDC32   (USER32.581)
1056  */
1057 HWND WINAPI WindowFromDC( HDC hDC )
1058 {
1059     DCE *dce;
1060     HWND hwnd;
1061
1062     WIN_LockWnds();
1063     dce = firstDCE;
1064
1065     while (dce && (dce->hDC != hDC)) dce = dce->next;
1066
1067     hwnd = dce ? dce->hwndCurrent : 0;
1068     WIN_UnlockWnds();
1069
1070     return hwnd;
1071 }
1072
1073
1074 /***********************************************************************
1075  *           LockWindowUpdate16   (USER.294)
1076  */
1077 BOOL16 WINAPI LockWindowUpdate16( HWND16 hwnd )
1078 {
1079     return LockWindowUpdate( hwnd );
1080 }
1081
1082
1083 /***********************************************************************
1084  *           LockWindowUpdate32   (USER32.378)
1085  */
1086 BOOL WINAPI LockWindowUpdate( HWND hwnd )
1087 {
1088     /* FIXME? DCX_LOCKWINDOWUPDATE is unimplemented */
1089     return TRUE;
1090 }