windows/dce.c

   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 "options.h"
  21 #include "dce.h"
  22 #include "class.h"
  23 #include "win.h"
  24 #include "gdi.h"
  25 #include "region.h"
  26 #include "heap.h"
  27 #include "sysmetrics.h"
  28 #include "debug.h"
  29 #include "wine/winuser16.h"
  30
  31 #define NB_DCE    5  /* Number of DCEs created at startup */
  32
  33 static DCE *firstDCE = 0;
  34 static HDC32 defaultDCstate = 0;
  35
  36 static void DCE_DeleteClipRgn( DCE* );
  37 static INT32 DCE_ReleaseDC( DCE* );
  38
  39
  40 /***********************************************************************
  41  *           DCE_DumpCache
  42  */
  43 static void DCE_DumpCache(void)
  44 {
  45     DCE* dce = firstDCE;
  46
  47     DUMP("DCE:\n");
  48     while( dce )
  49     {
  50         DUMP("\t[0x%08x] hWnd 0x%04x, dcx %08x, %s %s\n",
  51              (unsigned)dce, dce->hwndCurrent, (unsigned)dce->DCXflags,
  52              (dce->DCXflags & DCX_CACHE) ? "Cache" : "Owned",
  53              (dce->DCXflags & DCX_DCEBUSY) ? "InUse" : "" );
  54         dce = dce->next;
  55     }
  56 }
  57
  58 /***********************************************************************
  59  *           DCE_AllocDCE
  60  *
  61  * Allocate a new DCE.
  62  */
  63 DCE *DCE_AllocDCE( HWND32 hWnd, DCE_TYPE type )
  64 {
  65     DCE * dce;
  66     if (!(dce = HeapAlloc( SystemHeap, 0, sizeof(DCE) ))) return NULL;
  67     if (!(dce->hDC = CreateDC16( "DISPLAY", NULL, NULL, NULL )))
  68     {
  69         HeapFree( SystemHeap, 0, dce );
  70         return 0;
  71     }
  72
  73     /* store DCE handle in DC hook data field */
  74
  75     SetDCHook( dce->hDC, (FARPROC16)DCHook, (DWORD)dce );
  76
  77     dce->hwndCurrent = hWnd;
  78     dce->hClipRgn    = 0;
  79     dce->next        = firstDCE;
  80     firstDCE = dce;
  81
  82     if( type != DCE_CACHE_DC ) /* owned or class DC */
  83     {
  84         dce->DCXflags = DCX_DCEBUSY;
  85         if( hWnd )
  86         {
  87             WND* wnd = WIN_FindWndPtr(hWnd);
  88
  89             if( wnd->dwStyle & WS_CLIPCHILDREN ) dce->DCXflags |= DCX_CLIPCHILDREN;
  90             if( wnd->dwStyle & WS_CLIPSIBLINGS ) dce->DCXflags |= DCX_CLIPSIBLINGS;
  91         }
  92         SetHookFlags(dce->hDC,DCHF_INVALIDATEVISRGN);
  93     }
  94     else dce->DCXflags = DCX_CACHE | DCX_DCEEMPTY;
  95
  96     return dce;
  97 }
  98
  99
 100 /***********************************************************************
 101  *           DCE_FreeDCE
 102  */
 103 DCE* DCE_FreeDCE( DCE *dce )
 104 {
 105     DCE **ppDCE = &firstDCE;
 106
 107     if (!dce) return NULL;
 108     while (*ppDCE && (*ppDCE != dce)) ppDCE = &(*ppDCE)->next;
 109     if (*ppDCE == dce) *ppDCE = dce->next;
 110
 111     SetDCHook(dce->hDC, NULL, 0L);
 112
 113     DeleteDC32( dce->hDC );
 114     if( dce->hClipRgn && !(dce->DCXflags & DCX_KEEPCLIPRGN) )
 115         DeleteObject32(dce->hClipRgn);
 116     HeapFree( SystemHeap, 0, dce );
 117     return *ppDCE;
 118 }
 119
 120 /***********************************************************************
 121  *           DCE_FreeWindowDCE
 122  *
 123  * Remove owned DCE and reset unreleased cache DCEs.
 124  */
 125 void DCE_FreeWindowDCE( WND* pWnd )
 126 {
 127     DCE *pDCE = firstDCE;
 128
 129     while( pDCE )
 130     {
 131         if( pDCE->hwndCurrent == pWnd->hwndSelf )
 132         {
 133             if( pDCE == pWnd->dce ) /* owned DCE */
 134             {
 135                 pDCE = DCE_FreeDCE( pDCE );
 136                 pWnd->dce = NULL;
 137                 continue;
 138             }
 139             else
 140             {
 141                 if(!(pDCE->DCXflags & DCX_CACHE) ) /* class DCE */
 142                 {
 143                     if( pDCE->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN) )
 144                         DCE_DeleteClipRgn( pDCE );
 145                 }
 146                 else if( pDCE->DCXflags & DCX_DCEBUSY ) /* shared cache DCE */
 147                 {
 148                     ERR(dc,"[%04x] GetDC() without ReleaseDC()!\n",
 149                         pWnd->hwndSelf);
 150                     DCE_ReleaseDC( pDCE );
 151                 }
 152
 153                 pDCE->DCXflags &= DCX_CACHE;
 154                 pDCE->DCXflags |= DCX_DCEEMPTY;
 155                 pDCE->hwndCurrent = 0;
 156             }
 157         }
 158         pDCE = pDCE->next;
 159     }
 160 }
 161
 162
 163 /***********************************************************************
 164  *   DCE_DeleteClipRgn
 165  */
 166 static void DCE_DeleteClipRgn( DCE* dce )
 167 {
 168     dce->DCXflags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN | DCX_WINDOWPAINT);
 169
 170     if( dce->DCXflags & DCX_KEEPCLIPRGN )
 171         dce->DCXflags &= ~DCX_KEEPCLIPRGN;
 172     else
 173         if( dce->hClipRgn > 1 )
 174             DeleteObject32( dce->hClipRgn );
 175
 176     dce->hClipRgn = 0;
 177
 178     TRACE(dc,"\trestoring VisRgn\n");
 179
 180     RestoreVisRgn(dce->hDC);
 181 }
 182
 183
 184 /***********************************************************************
 185  *   DCE_ReleaseDC
 186  */
 187 static INT32 DCE_ReleaseDC( DCE* dce )
 188 {
 189     if ((dce->DCXflags & (DCX_DCEEMPTY | DCX_DCEBUSY)) != DCX_DCEBUSY) return 0;
 190
 191     /* restore previous visible region */
 192
 193     if ((dce->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) &&
 194         (dce->DCXflags & (DCX_CACHE | DCX_WINDOWPAINT)) )
 195         DCE_DeleteClipRgn( dce );
 196
 197     if (dce->DCXflags & DCX_CACHE)
 198     {
 199         SetDCState( dce->hDC, defaultDCstate );
 200         dce->DCXflags &= ~DCX_DCEBUSY;
 201         if (dce->DCXflags & DCX_DCEDIRTY)
 202         {
 203             /* don't keep around invalidated entries
 204              * because SetDCState() disables hVisRgn updates
 205              * by removing dirty bit. */
 206
 207             dce->hwndCurrent = 0;
 208             dce->DCXflags &= DCX_CACHE;
 209             dce->DCXflags |= DCX_DCEEMPTY;
 210         }
 211     }
 212     return 1;
 213 }
 214
 215
 216 /***********************************************************************
 217  *   DCE_InvalidateDCE
 218  *
 219  * It is called from SetWindowPos() - we have to mark as dirty all busy
 220  * DCE's for windows that have pWnd->parent as an ansector and whose client
 221  * rect intersects with specified update rectangle.
 222  */
 223 BOOL32 DCE_InvalidateDCE(WND* pWnd, const RECT32* pRectUpdate)
 224 {
 225     WND* wndScope = pWnd->parent;
 226     BOOL32 bRet = FALSE;
 227
 228     if( wndScope )
 229     {
 230         DCE *dce;
 231
 232         TRACE(dc,"scope hwnd = %04x, (%i,%i - %i,%i)\n",
 233                      wndScope->hwndSelf, pRectUpdate->left,pRectUpdate->top,
 234                      pRectUpdate->right,pRectUpdate->bottom);
 235         if(TRACE_ON(dc))
 236           DCE_DumpCache();
 237
 238         /* walk all DCEs and fixup non-empty entries */
 239
 240         for (dce = firstDCE; (dce); dce = dce->next)
 241         {
 242             if( !(dce->DCXflags & DCX_DCEEMPTY) )
 243             {
 244                 WND* wndCurrent = WIN_FindWndPtr(dce->hwndCurrent);
 245
 246                 if( wndCurrent && wndCurrent != WIN_GetDesktop() )
 247                 {
 248                     WND* wnd = wndCurrent;
 249                     INT32 xoffset = 0, yoffset = 0;
 250
 251                     if( (wndCurrent == wndScope) && !(dce->DCXflags & DCX_CLIPCHILDREN) ) continue;
 252
 253                     /* check if DCE window is within the z-order scope */
 254
 255                     for( wnd = wndCurrent; wnd; wnd = wnd->parent )
 256                     {
 257                         if( wnd == wndScope )
 258                         {
 259                             RECT32 wndRect;
 260
 261                             wndRect = wndCurrent->rectWindow;
 262
 263                             OffsetRect32( &wndRect, xoffset - wndCurrent->rectClient.left,
 264                                                     yoffset - wndCurrent->rectClient.top);
 265
 266                             if (pWnd == wndCurrent ||
 267                                 IntersectRect32( &wndRect, &wndRect, pRectUpdate ))
 268                             {
 269                                 if( !(dce->DCXflags & DCX_DCEBUSY) )
 270                                 {
 271                                     /* Don't bother with visible regions of unused DCEs */
 272
 273                                     TRACE(dc,"\tpurged %08x dce [%04x]\n",
 274                                                 (unsigned)dce, wndCurrent->hwndSelf);
 275
 276                                     dce->hwndCurrent = 0;
 277                                     dce->DCXflags &= DCX_CACHE;
 278                                     dce->DCXflags |= DCX_DCEEMPTY;
 279                                 }
 280                                 else
 281                                 {
 282                                     /* Set dirty bits in the hDC and DCE structs */
 283
 284                                     TRACE(dc,"\tfixed up %08x dce [%04x]\n",
 285                                                 (unsigned)dce, wndCurrent->hwndSelf);
 286
 287                                     dce->DCXflags |= DCX_DCEDIRTY;
 288                                     SetHookFlags(dce->hDC, DCHF_INVALIDATEVISRGN);
 289                                     bRet = TRUE;
 290                                 }
 291                             }
 292                             break;
 293                         }
 294                         xoffset += wnd->rectClient.left;
 295                         yoffset += wnd->rectClient.top;
 296                     }
 297                 }
 298             }
 299         } /* dce list */
 300     }
 301     return bRet;
 302 }
 303
 304 /***********************************************************************
 305  *           DCE_Init
 306  */
 307 void DCE_Init(void)
 308 {
 309     int i;
 310     DCE * dce;
 311
 312     for (i = 0; i < NB_DCE; i++)
 313     {
 314         if (!(dce = DCE_AllocDCE( 0, DCE_CACHE_DC ))) return;
 315         if (!defaultDCstate) defaultDCstate = GetDCState( dce->hDC );
 316     }
 317 }
 318
 319
 320 /***********************************************************************
 321  *           DCE_GetVisRect
 322  *
 323  * Calculate the visible rectangle of a window (i.e. the client or
 324  * window area clipped by the client area of all ancestors) in the
 325  * corresponding coordinates. Return FALSE if the visible region is empty.
 326  */
 327 static BOOL32 DCE_GetVisRect( WND *wndPtr, BOOL32 clientArea, RECT32 *lprect )
 328 {
 329     *lprect = clientArea ? wndPtr->rectClient : wndPtr->rectWindow;
 330
 331     if (wndPtr->dwStyle & WS_VISIBLE)
 332     {
 333         INT32 xoffset = lprect->left;
 334         INT32 yoffset = lprect->top;
 335
 336         while (wndPtr->dwStyle & WS_CHILD)
 337         {
 338             wndPtr = wndPtr->parent;
 339
 340             if ( (wndPtr->dwStyle & (WS_ICONIC | WS_VISIBLE)) != WS_VISIBLE )
 341                 goto fail;
 342
 343             xoffset += wndPtr->rectClient.left;
 344             yoffset += wndPtr->rectClient.top;
 345             OffsetRect32( lprect, wndPtr->rectClient.left,
 346                                   wndPtr->rectClient.top );
 347
 348             if( (wndPtr->rectClient.left >= wndPtr->rectClient.right) ||
 349                 (wndPtr->rectClient.top >= wndPtr->rectClient.bottom) ||
 350                 (lprect->left >= wndPtr->rectClient.right) ||
 351                 (lprect->right <= wndPtr->rectClient.left) ||
 352                 (lprect->top >= wndPtr->rectClient.bottom) ||
 353                 (lprect->bottom <= wndPtr->rectClient.top) )
 354                 goto fail;
 355
 356             lprect->left = MAX( lprect->left, wndPtr->rectClient.left );
 357             lprect->right = MIN( lprect->right, wndPtr->rectClient.right );
 358             lprect->top = MAX( lprect->top, wndPtr->rectClient.top );
 359             lprect->bottom = MIN( lprect->bottom, wndPtr->rectClient.bottom );
 360         }
 361         OffsetRect32( lprect, -xoffset, -yoffset );
 362         return TRUE;
 363     }
 364
 365 fail:
 366     SetRectEmpty32( lprect );
 367     return FALSE;
 368 }
 369
 370
 371 /***********************************************************************
 372  *           DCE_AddClipRects
 373  *
 374  * Go through the linked list of windows from pWndStart to pWndEnd,
 375  * adding to the clip region the intersection of the target rectangle
 376  * with an offset window rectangle.
 377  */
 378 static BOOL32 DCE_AddClipRects( WND *pWndStart, WND *pWndEnd,
 379                                 HRGN32 hrgnClip, LPRECT32 lpRect, int x, int y )
 380 {
 381     RECT32 rect;
 382
 383     if( pWndStart->pDriver->pIsSelfClipping( pWndStart ) )
 384         return TRUE; /* The driver itself will do the clipping */
 385
 386     for (; pWndStart != pWndEnd; pWndStart = pWndStart->next)
 387     {
 388         if( !(pWndStart->dwStyle & WS_VISIBLE) ) continue;
 389
 390         rect.left = pWndStart->rectWindow.left + x;
 391         rect.top = pWndStart->rectWindow.top + y;
 392         rect.right = pWndStart->rectWindow.right + x;
 393         rect.bottom = pWndStart->rectWindow.bottom + y;
 394
 395         if( IntersectRect32( &rect, &rect, lpRect ))
 396             if(!REGION_UnionRectWithRgn( hrgnClip, &rect ))
 397                 break;
 398     }
 399     return (pWndStart == pWndEnd);
 400 }
 401
 402
 403 /***********************************************************************
 404  *           DCE_GetVisRgn
 405  *
 406  * Return the visible region of a window, i.e. the client or window area
 407  * clipped by the client area of all ancestors, and then optionally
 408  * by siblings and children.
 409  */
 410 HRGN32 DCE_GetVisRgn( HWND32 hwnd, WORD flags )
 411 {
 412     HRGN32 hrgnVis = 0;
 413     RECT32 rect;
 414     WND *wndPtr = WIN_FindWndPtr( hwnd );
 415
 416     /* Get visible rectangle and create a region with it. */
 417
 418     if (wndPtr && DCE_GetVisRect(wndPtr, !(flags & DCX_WINDOW), &rect))
 419     {
 420         if((hrgnVis = CreateRectRgnIndirect32( &rect )))
 421         {
 422             HRGN32 hrgnClip = CreateRectRgn32( 0, 0, 0, 0 );
 423             INT32 xoffset, yoffset;
 424
 425             if( hrgnClip )
 426             {
 427                 /* Compute obscured region for the visible rectangle by
 428                  * clipping children, siblings, and ancestors. Note that
 429                  * DCE_GetVisRect() returns a rectangle either in client
 430                  * or in window coordinates (for DCX_WINDOW request). */
 431
 432                 if( (flags & DCX_CLIPCHILDREN) && wndPtr->child )
 433                 {
 434                     if( flags & DCX_WINDOW )
 435                     {
 436                         /* adjust offsets since child window rectangles are
 437                          * in client coordinates */
 438
 439                         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 440                         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 441                     }
 442                     else
 443                         xoffset = yoffset = 0;
 444
 445                     DCE_AddClipRects( wndPtr->child, NULL, hrgnClip,
 446                                       &rect, xoffset, yoffset );
 447                 }
 448
 449                 /* sibling window rectangles are in client
 450                  * coordinates of the parent window */
 451
 452                 if (flags & DCX_WINDOW)
 453                 {
 454                     xoffset = -wndPtr->rectWindow.left;
 455                     yoffset = -wndPtr->rectWindow.top;
 456                 }
 457                 else
 458                 {
 459                     xoffset = -wndPtr->rectClient.left;
 460                     yoffset = -wndPtr->rectClient.top;
 461                 }
 462
 463                 if (flags & DCX_CLIPSIBLINGS && wndPtr->parent )
 464                     DCE_AddClipRects( wndPtr->parent->child,
 465                                       wndPtr, hrgnClip, &rect, xoffset, yoffset );
 466
 467                 /* Clip siblings of all ancestors that have the
 468                  * WS_CLIPSIBLINGS style
 469                  */
 470
 471                 while (wndPtr->dwStyle & WS_CHILD)
 472                 {
 473                     wndPtr = wndPtr->parent;
 474                     xoffset -= wndPtr->rectClient.left;
 475                     yoffset -= wndPtr->rectClient.top;
 476                     if(wndPtr->dwStyle & WS_CLIPSIBLINGS && wndPtr->parent)
 477                     {
 478                         DCE_AddClipRects( wndPtr->parent->child, wndPtr,
 479                                           hrgnClip, &rect, xoffset, yoffset );
 480                     }
 481                 }
 482
 483                 /* Now once we've got a jumbo clip region we have
 484                  * to substract it from the visible rectangle.
 485                  */
 486
 487                 CombineRgn32( hrgnVis, hrgnVis, hrgnClip, RGN_DIFF );
 488                 DeleteObject32( hrgnClip );
 489             }
 490             else
 491             {
 492                 DeleteObject32( hrgnVis );
 493                 hrgnVis = 0;
 494             }
 495         }
 496     }
 497     else
 498         hrgnVis = CreateRectRgn32(0, 0, 0, 0); /* empty */
 499     return hrgnVis;
 500 }
 501
 502 /***********************************************************************
 503  *           DCE_OffsetVisRgn
 504  *
 505  * Change region from DC-origin relative coordinates to screen coords.
 506  */
 507
 508 static void DCE_OffsetVisRgn( HDC32 hDC, HRGN32 hVisRgn )
 509 {
 510     DC *dc;
 511     if (!(dc = (DC *) GDI_GetObjPtr( hDC, DC_MAGIC ))) return;
 512
 513     OffsetRgn32( hVisRgn, dc->w.DCOrgX, dc->w.DCOrgY );
 514
 515     GDI_HEAP_UNLOCK( hDC );
 516 }
 517
 518 /***********************************************************************
 519  *           DCE_ExcludeRgn
 520  *
 521  *  Translate given region from the wnd client to the DC coordinates
 522  *  and add it to the clipping region.
 523  */
 524 INT16 DCE_ExcludeRgn( HDC32 hDC, WND* wnd, HRGN32 hRgn )
 525 {
 526   POINT32  pt = {0, 0};
 527   DCE     *dce = firstDCE;
 528
 529   while (dce && (dce->hDC != hDC)) dce = dce->next;
 530   if( dce )
 531   {
 532       MapWindowPoints32( wnd->hwndSelf, dce->hwndCurrent, &pt, 1);
 533       if( dce->DCXflags & DCX_WINDOW )
 534       {
 535           wnd = WIN_FindWndPtr(dce->hwndCurrent);
 536           pt.x += wnd->rectClient.left - wnd->rectWindow.left;
 537           pt.y += wnd->rectClient.top - wnd->rectWindow.top;
 538       }
 539   }
 540   else return ERROR;
 541   OffsetRgn32(hRgn, pt.x, pt.y);
 542
 543   return ExtSelectClipRgn( hDC, hRgn, RGN_DIFF );
 544 }
 545
 546 /***********************************************************************
 547  *           GetDCEx16    (USER.359)
 548  */
 549 HDC16 WINAPI GetDCEx16( HWND16 hwnd, HRGN16 hrgnClip, DWORD flags )
 550 {
 551     return (HDC16)GetDCEx32( hwnd, hrgnClip, flags );
 552 }
 553
 554
 555 /***********************************************************************
 556  *           GetDCEx32    (USER32.231)
 557  *
 558  * Unimplemented flags: DCX_LOCKWINDOWUPDATE
 559  *
 560  * FIXME: Full support for hrgnClip == 1 (alias for entire window).
 561  */
 562 HDC32 WINAPI GetDCEx32( HWND32 hwnd, HRGN32 hrgnClip, DWORD flags )
 563 {
 564     HRGN32      hrgnVisible = 0;
 565     HDC32       hdc = 0;
 566     DCE *       dce;
 567     DC *        dc;
 568     WND *       wndPtr;
 569     DWORD       dcxFlags = 0;
 570     BOOL32      bUpdateVisRgn = TRUE;
 571     BOOL32      bUpdateClipOrigin = FALSE;
 572
 573     TRACE(dc,"hwnd %04x, hrgnClip %04x, flags %08x\n",
 574                                 hwnd, hrgnClip, (unsigned)flags);
 575
 576     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 577
 578     /* fixup flags */
 579
 580     if (!(wndPtr->class->style & (CS_OWNDC | CS_CLASSDC))) flags |= DCX_CACHE;
 581
 582     if (flags & DCX_USESTYLE)
 583     {
 584         flags &= ~( DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP);
 585
 586         if( wndPtr->dwStyle & WS_CLIPSIBLINGS )
 587             flags |= DCX_CLIPSIBLINGS;
 588
 589         if ( !(flags & DCX_WINDOW) )
 590         {
 591             if (wndPtr->class->style & CS_PARENTDC) flags |= DCX_PARENTCLIP;
 592
 593             if (wndPtr->dwStyle & WS_CLIPCHILDREN &&
 594                      !(wndPtr->dwStyle & WS_MINIMIZE) ) flags |= DCX_CLIPCHILDREN;
 595         }
 596         else flags |= DCX_CACHE;
 597     }
 598
 599     if( flags & DCX_NOCLIPCHILDREN )
 600     {
 601         flags |= DCX_CACHE;
 602         flags &= ~(DCX_PARENTCLIP | DCX_CLIPCHILDREN);
 603     }
 604
 605     if (flags & DCX_WINDOW)
 606         flags = (flags & ~DCX_CLIPCHILDREN) | DCX_CACHE;
 607
 608     if (!(wndPtr->dwStyle & WS_CHILD) || !wndPtr->parent )
 609         flags &= ~DCX_PARENTCLIP;
 610     else if( flags & DCX_PARENTCLIP )
 611     {
 612         flags |= DCX_CACHE;
 613         if( !(flags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN)) )
 614             if( (wndPtr->dwStyle & WS_VISIBLE) && (wndPtr->parent->dwStyle & WS_VISIBLE) )
 615             {
 616                 flags &= ~DCX_CLIPCHILDREN;
 617                 if( wndPtr->parent->dwStyle & WS_CLIPSIBLINGS )
 618                     flags |= DCX_CLIPSIBLINGS;
 619             }
 620     }
 621
 622     /* find a suitable DCE */
 623
 624     dcxFlags = flags & (DCX_PARENTCLIP | DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN |
 625                         DCX_CACHE | DCX_WINDOW);
 626
 627     if (flags & DCX_CACHE)
 628     {
 629         DCE*    dceEmpty;
 630         DCE*    dceUnused;
 631
 632         dceEmpty = dceUnused = NULL;
 633
 634         /* Strategy: First, we attempt to find a non-empty but unused DCE with
 635          * compatible flags. Next, we look for an empty entry. If the cache is
 636          * full we have to purge one of the unused entries.
 637          */
 638
 639         for (dce = firstDCE; (dce); dce = dce->next)
 640         {
 641             if ((dce->DCXflags & (DCX_CACHE | DCX_DCEBUSY)) == DCX_CACHE )
 642             {
 643                 dceUnused = dce;
 644
 645                 if (dce->DCXflags & DCX_DCEEMPTY)
 646                     dceEmpty = dce;
 647                 else
 648                 if ((dce->hwndCurrent == hwnd) &&
 649                    ((dce->DCXflags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN |
 650                                       DCX_CACHE | DCX_WINDOW | DCX_PARENTCLIP)) == dcxFlags))
 651                 {
 652                     TRACE(dc,"\tfound valid %08x dce [%04x], flags %08x\n",
 653                                         (unsigned)dce, hwnd, (unsigned)dcxFlags );
 654                     bUpdateVisRgn = FALSE;
 655                     bUpdateClipOrigin = TRUE;
 656                     break;
 657                 }
 658             }
 659         }
 660         if (!dce) dce = (dceEmpty) ? dceEmpty : dceUnused;
 661     }
 662     else
 663     {
 664         dce = (wndPtr->class->style & CS_OWNDC) ? wndPtr->dce : wndPtr->class->dce;
 665         if( dce->hwndCurrent == hwnd )
 666         {
 667             TRACE(dc,"\tskipping hVisRgn update\n");
 668             bUpdateVisRgn = FALSE; /* updated automatically, via DCHook() */
 669
 670             if( (dce->DCXflags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN)) &&
 671                 (flags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN)) )
 672             {
 673                 /* This is likely to be a nested BeginPaint(). */
 674
 675                 if( dce->hClipRgn != hrgnClip )
 676                 {
 677                     FIXME(dc,"new hrgnClip[%04x] smashes the previous[%04x]\n",
 678                           hrgnClip, dce->hClipRgn );
 679                     DCE_DeleteClipRgn( dce );
 680                 }
 681                 else
 682                     RestoreVisRgn(dce->hDC);
 683             }
 684         }
 685     }
 686     if (!dce) return 0;
 687
 688     dce->hwndCurrent = hwnd;
 689     dce->hClipRgn = 0;
 690     dce->DCXflags = dcxFlags | (flags & DCX_WINDOWPAINT) | DCX_DCEBUSY;
 691     hdc = dce->hDC;
 692
 693     if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
 694     bUpdateVisRgn = bUpdateVisRgn || (dc->w.flags & DC_DIRTY);
 695
 696     /* recompute visible region */
 697
 698     wndPtr->pDriver->pSetDrawable( wndPtr, dc, flags, bUpdateClipOrigin );
 699     if( bUpdateVisRgn )
 700     {
 701         TRACE(dc,"updating visrgn for %08x dce, hwnd [%04x]\n", (unsigned)dce, hwnd);
 702
 703         if (flags & DCX_PARENTCLIP)
 704         {
 705             WND *parentPtr = wndPtr->parent;
 706
 707             if( wndPtr->dwStyle & WS_VISIBLE && !(parentPtr->dwStyle & WS_MINIMIZE) )
 708             {
 709                 if( parentPtr->dwStyle & WS_CLIPSIBLINGS )
 710                     dcxFlags = DCX_CLIPSIBLINGS | (flags & ~(DCX_CLIPCHILDREN | DCX_WINDOW));
 711                 else
 712                     dcxFlags = flags & ~(DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | DCX_WINDOW);
 713
 714                 hrgnVisible = DCE_GetVisRgn( parentPtr->hwndSelf, dcxFlags );
 715                 if( flags & DCX_WINDOW )
 716                     OffsetRgn32( hrgnVisible, -wndPtr->rectWindow.left,
 717                                               -wndPtr->rectWindow.top );
 718                 else
 719                     OffsetRgn32( hrgnVisible, -wndPtr->rectClient.left,
 720                                               -wndPtr->rectClient.top );
 721                 DCE_OffsetVisRgn( hdc, hrgnVisible );
 722             }
 723             else
 724                 hrgnVisible = CreateRectRgn32( 0, 0, 0, 0 );
 725         }
 726         else
 727             if ((hwnd == GetDesktopWindow32()) &&
 728                 (rootWindow == DefaultRootWindow(display)))
 729                  hrgnVisible = CreateRectRgn32( 0, 0, SYSMETRICS_CXSCREEN,
 730                                                       SYSMETRICS_CYSCREEN );
 731             else
 732             {
 733                 hrgnVisible = DCE_GetVisRgn( hwnd, flags );
 734                 DCE_OffsetVisRgn( hdc, hrgnVisible );
 735             }
 736
 737         dc->w.flags &= ~DC_DIRTY;
 738         dce->DCXflags &= ~DCX_DCEDIRTY;
 739         SelectVisRgn( hdc, hrgnVisible );
 740     }
 741     else
 742         TRACE(dc,"no visrgn update %08x dce, hwnd [%04x]\n", (unsigned)dce, hwnd);
 743
 744     /* apply additional region operation (if any) */
 745
 746     if( flags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN) )
 747     {
 748         if( !hrgnVisible ) hrgnVisible = CreateRectRgn32( 0, 0, 0, 0 );
 749
 750         dce->DCXflags |= flags & (DCX_KEEPCLIPRGN | DCX_INTERSECTRGN | DCX_EXCLUDERGN);
 751         dce->hClipRgn = hrgnClip;
 752
 753         TRACE(dc, "\tsaved VisRgn, clipRgn = %04x\n", hrgnClip);
 754
 755         SaveVisRgn( hdc );
 756         CombineRgn32( hrgnVisible, hrgnClip, 0, RGN_COPY );
 757         DCE_OffsetVisRgn( hdc, hrgnVisible );
 758         CombineRgn32( hrgnVisible, InquireVisRgn( hdc ), hrgnVisible,
 759                       (flags & DCX_INTERSECTRGN) ? RGN_AND : RGN_DIFF );
 760         SelectVisRgn( hdc, hrgnVisible );
 761     }
 762
 763     if( hrgnVisible ) DeleteObject32( hrgnVisible );
 764
 765     TRACE(dc, "(%04x,%04x,0x%lx): returning %04x\n",
 766                hwnd, hrgnClip, flags, hdc);
 767     return hdc;
 768 }
 769
 770
 771 /***********************************************************************
 772  *           GetDC16    (USER.66)
 773  */
 774 HDC16 WINAPI GetDC16( HWND16 hwnd )
 775 {
 776     return (HDC16)GetDC32( hwnd );
 777 }
 778
 779
 780 /***********************************************************************
 781  *           GetDC32    (USER32.230)
 782  * RETURNS
 783  *      :Handle to DC
 784  *      NULL: Failure
 785  */
 786 HDC32 WINAPI GetDC32(
 787              HWND32 hwnd /* handle of window */
 788 ) {
 789     if (!hwnd)
 790         return GetDCEx32( GetDesktopWindow32(), 0, DCX_CACHE | DCX_WINDOW );
 791     return GetDCEx32( hwnd, 0, DCX_USESTYLE );
 792 }
 793
 794
 795 /***********************************************************************
 796  *           GetWindowDC16    (USER.67)
 797  */
 798 HDC16 WINAPI GetWindowDC16( HWND16 hwnd )
 799 {
 800     if (!hwnd) hwnd = GetDesktopWindow16();
 801     return GetDCEx16( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
 802 }
 803
 804
 805 /***********************************************************************
 806  *           GetWindowDC32    (USER32.304)
 807  */
 808 HDC32 WINAPI GetWindowDC32( HWND32 hwnd )
 809 {
 810     if (!hwnd) hwnd = GetDesktopWindow32();
 811     return GetDCEx32( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
 812 }
 813
 814
 815 /***********************************************************************
 816  *           ReleaseDC16    (USER.68)
 817  */
 818 INT16 WINAPI ReleaseDC16( HWND16 hwnd, HDC16 hdc )
 819 {
 820     return (INT16)ReleaseDC32( hwnd, hdc );
 821 }
 822
 823
 824 /***********************************************************************
 825  *           ReleaseDC32    (USER32.440)
 826  *
 827  * RETURNS
 828  *      1: Success
 829  *      0: Failure
 830  */
 831 INT32 WINAPI ReleaseDC32(
 832              HWND32 hwnd /* Handle of window - ignored */,
 833              HDC32 hdc   /* Handle of device context */
 834 ) {
 835     DCE * dce = firstDCE;
 836
 837     TRACE(dc, "%04x %04x\n", hwnd, hdc );
 838
 839     while (dce && (dce->hDC != hdc)) dce = dce->next;
 840
 841     if ( dce )
 842         if ( dce->DCXflags & DCX_DCEBUSY )
 843              return DCE_ReleaseDC( dce );
 844     return 0;
 845 }
 846
 847 /***********************************************************************
 848  *           DCHook    (USER.362)
 849  *
 850  * See "Undoc. Windows" for hints (DC, SetDCHook, SetHookFlags)..
 851  */
 852 BOOL16 WINAPI DCHook( HDC16 hDC, WORD code, DWORD data, LPARAM lParam )
 853 {
 854     HRGN32 hVisRgn;
 855     DCE *dce = firstDCE;;
 856
 857     TRACE(dc,"hDC = %04x, %i\n", hDC, code);
 858
 859     while (dce && (dce->hDC != hDC)) dce = dce->next;
 860     if (!dce) return 0;
 861
 862     switch( code )
 863     {
 864       case DCHC_INVALIDVISRGN:
 865
 866            /* GDI code calls this when it detects that the
 867             * DC is dirty (usually after SetHookFlags()). This
 868             * means that we have to recompute the visible region.
 869             */
 870
 871            if( dce->DCXflags & DCX_DCEBUSY )
 872            {
 873                SetHookFlags(hDC, DCHF_VALIDATEVISRGN);
 874                hVisRgn = DCE_GetVisRgn(dce->hwndCurrent, dce->DCXflags);
 875
 876                TRACE(dc,"\tapplying saved clipRgn\n");
 877
 878                /* clip this region with saved clipping region */
 879
 880                if ( (dce->DCXflags & DCX_INTERSECTRGN && dce->hClipRgn != 1) ||
 881                   (  dce->DCXflags & DCX_EXCLUDERGN && dce->hClipRgn) )
 882                {
 883
 884                     if( (!dce->hClipRgn && dce->DCXflags & DCX_INTERSECTRGN) ||
 885                          (dce->hClipRgn == 1 && dce->DCXflags & DCX_EXCLUDERGN) )
 886                          SetRectRgn32(hVisRgn,0,0,0,0);
 887                     else
 888                          CombineRgn32(hVisRgn, hVisRgn, dce->hClipRgn,
 889                                       (dce->DCXflags & DCX_EXCLUDERGN)? RGN_DIFF:RGN_AND);
 890                }
 891                dce->DCXflags &= ~DCX_DCEDIRTY;
 892                DCE_OffsetVisRgn( hDC, hVisRgn );
 893                SelectVisRgn(hDC, hVisRgn);
 894                DeleteObject32( hVisRgn );
 895            }
 896            else /* non-fatal but shouldn't happen */
 897              WARN(dc, "DC is not in use!\n");
 898            break;
 899
 900       case DCHC_DELETEDC: /* FIXME: ?? */
 901            break;
 902
 903       default:
 904            FIXME(dc,"unknown code\n");
 905     }
 906   return 0;
 907 }
 908
 909
 910 /**********************************************************************
 911  *          WindowFromDC16   (USER.117)
 912  */
 913 HWND16 WINAPI WindowFromDC16( HDC16 hDC )
 914 {
 915     return (HWND16)WindowFromDC32( hDC );
 916 }
 917
 918
 919 /**********************************************************************
 920  *          WindowFromDC32   (USER32.581)
 921  */
 922 HWND32 WINAPI WindowFromDC32( HDC32 hDC )
 923 {
 924     DCE *dce = firstDCE;
 925     while (dce && (dce->hDC != hDC)) dce = dce->next;
 926     return dce ? dce->hwndCurrent : 0;
 927 }
 928
 929
 930 /***********************************************************************
 931  *           LockWindowUpdate16   (USER.294)
 932  */
 933 BOOL16 WINAPI LockWindowUpdate16( HWND16 hwnd )
 934 {
 935     return LockWindowUpdate32( hwnd );
 936 }
 937
 938
 939 /***********************************************************************
 940  *           LockWindowUpdate32   (USER32.378)
 941  */
 942 BOOL32 WINAPI LockWindowUpdate32( HWND32 hwnd )
 943 {
 944     /* FIXME? DCX_LOCKWINDOWUPDATE is unimplemented */
 945     return TRUE;
 946 }