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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 "options.h"
  22 #include "dce.h"
  23 #include "class.h"
  24 #include "win.h"
  25 #include "gdi.h"
  26 #include "region.h"
  27 #include "heap.h"
  28 #include "local.h"
  29 #include "user.h"
  30 #include "debugtools.h"
  31 #include "windef.h"
  32 #include "wingdi.h"
  33 #include "wine/winbase16.h"
  34 #include "wine/winuser16.h"
  35
  36 DEFAULT_DEBUG_CHANNEL(dc);
  37
  38 #define NB_DCE    5  /* Number of DCEs created at startup */
  39
  40 static DCE *firstDCE = 0;
  41 static HDC defaultDCstate = 0;
  42
  43 static void DCE_DeleteClipRgn( DCE* );
  44 static INT DCE_ReleaseDC( DCE* );
  45
  46
  47 /***********************************************************************
  48  *           DCE_DumpCache
  49  */
  50 static void DCE_DumpCache(void)
  51 {
  52     DCE *dce;
  53
  54     WIN_LockWnds();
  55     dce = firstDCE;
  56
  57     DPRINTF("DCE:\n");
  58     while( dce )
  59     {
  60         DPRINTF("\t[0x%08x] hWnd 0x%04x, dcx %08x, %s %s\n",
  61              (unsigned)dce, dce->hwndCurrent, (unsigned)dce->DCXflags,
  62              (dce->DCXflags & DCX_CACHE) ? "Cache" : "Owned",
  63              (dce->DCXflags & DCX_DCEBUSY) ? "InUse" : "" );
  64         dce = dce->next;
  65     }
  66
  67     WIN_UnlockWnds();
  68 }
  69
  70 /***********************************************************************
  71  *           DCE_AllocDCE
  72  *
  73  * Allocate a new DCE.
  74  */
  75 DCE *DCE_AllocDCE( HWND hWnd, DCE_TYPE type )
  76 {
  77     FARPROC16 hookProc;
  78     DCE * dce;
  79     WND* wnd;
  80
  81     if (!(dce = HeapAlloc( SystemHeap, 0, sizeof(DCE) ))) return NULL;
  82     if (!(dce->hDC = CreateDCA( "DISPLAY", NULL, NULL, NULL )))
  83     {
  84         HeapFree( SystemHeap, 0, dce );
  85         return 0;
  86     }
  87
  88     wnd = WIN_FindWndPtr(hWnd);
  89
  90     /* store DCE handle in DC hook data field */
  91
  92     hookProc = GetProcAddress16( GetModuleHandle16("USER"), (LPCSTR)362 );
  93     SetDCHook( dce->hDC, hookProc, (DWORD)dce );
  94
  95     dce->hwndCurrent = hWnd;
  96     dce->hClipRgn    = 0;
  97     dce->next        = firstDCE;
  98     firstDCE = dce;
  99
 100     if( type != DCE_CACHE_DC ) /* owned or class DC */
 101     {
 102         dce->DCXflags = DCX_DCEBUSY;
 103         if( hWnd )
 104         {
 105             if( wnd->dwStyle & WS_CLIPCHILDREN ) dce->DCXflags |= DCX_CLIPCHILDREN;
 106             if( wnd->dwStyle & WS_CLIPSIBLINGS ) dce->DCXflags |= DCX_CLIPSIBLINGS;
 107         }
 108         SetHookFlags16(dce->hDC,DCHF_INVALIDATEVISRGN);
 109     }
 110     else dce->DCXflags = DCX_CACHE | DCX_DCEEMPTY;
 111
 112     WIN_ReleaseWndPtr(wnd);
 113
 114     return dce;
 115 }
 116
 117
 118 /***********************************************************************
 119  *           DCE_FreeDCE
 120  */
 121 DCE* DCE_FreeDCE( DCE *dce )
 122 {
 123     DCE **ppDCE;
 124
 125     if (!dce) return NULL;
 126
 127     WIN_LockWnds();
 128
 129     ppDCE = &firstDCE;
 130
 131     while (*ppDCE && (*ppDCE != dce)) ppDCE = &(*ppDCE)->next;
 132     if (*ppDCE == dce) *ppDCE = dce->next;
 133
 134     SetDCHook(dce->hDC, NULL, 0L);
 135
 136     DeleteDC( dce->hDC );
 137     if( dce->hClipRgn && !(dce->DCXflags & DCX_KEEPCLIPRGN) )
 138         DeleteObject(dce->hClipRgn);
 139     HeapFree( SystemHeap, 0, dce );
 140
 141     WIN_UnlockWnds();
 142
 143     return *ppDCE;
 144 }
 145
 146 /***********************************************************************
 147  *           DCE_FreeWindowDCE
 148  *
 149  * Remove owned DCE and reset unreleased cache DCEs.
 150  */
 151 void DCE_FreeWindowDCE( WND* pWnd )
 152 {
 153     DCE *pDCE;
 154
 155     WIN_LockWnds();
 156     pDCE = firstDCE;
 157
 158     while( pDCE )
 159     {
 160         if( pDCE->hwndCurrent == pWnd->hwndSelf )
 161         {
 162             if( pDCE == pWnd->dce ) /* owned or Class DCE*/
 163             {
 164                 if (pWnd->class->style & CS_OWNDC)      /* owned DCE*/
 165                 {
 166                     pDCE = DCE_FreeDCE( pDCE );
 167                     pWnd->dce = NULL;
 168                     continue;
 169                 }
 170                 else if( pDCE->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN) ) /* Class DCE*/
 171                 {
 172                     DCE_DeleteClipRgn( pDCE );
 173                     pDCE->hwndCurrent = 0;
 174                 }
 175             }
 176             else
 177             {
 178                 if( pDCE->DCXflags & DCX_DCEBUSY ) /* shared cache DCE */
 179                 {
 180                     /* FIXME: AFAICS we are doing the right thing here so
 181                      * this should be a WARN. But this is best left as an ERR
 182                      * because the 'application error' is likely to come from
 183                      * another part of Wine (i.e. it's our fault after all).
 184                      * We should change this to WARN when Wine is more stable
 185                      * (for 1.0?).
 186                      */
 187                     ERR("[%04x] GetDC() without ReleaseDC()!\n",
 188                         pWnd->hwndSelf);
 189                     DCE_ReleaseDC( pDCE );
 190                 }
 191
 192                 pDCE->DCXflags &= DCX_CACHE;
 193                 pDCE->DCXflags |= DCX_DCEEMPTY;
 194                 pDCE->hwndCurrent = 0;
 195             }
 196         }
 197         pDCE = pDCE->next;
 198     }
 199
 200     WIN_UnlockWnds();
 201 }
 202
 203
 204 /***********************************************************************
 205  *   DCE_DeleteClipRgn
 206  */
 207 static void DCE_DeleteClipRgn( DCE* dce )
 208 {
 209     dce->DCXflags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN | DCX_WINDOWPAINT);
 210
 211     if( dce->DCXflags & DCX_KEEPCLIPRGN )
 212         dce->DCXflags &= ~DCX_KEEPCLIPRGN;
 213     else
 214         if( dce->hClipRgn > 1 )
 215             DeleteObject( dce->hClipRgn );
 216
 217     dce->hClipRgn = 0;
 218
 219     TRACE("\trestoring VisRgn\n");
 220
 221     RestoreVisRgn16(dce->hDC);
 222 }
 223
 224
 225 /***********************************************************************
 226  *   DCE_ReleaseDC
 227  */
 228 static INT DCE_ReleaseDC( DCE* dce )
 229 {
 230     if ((dce->DCXflags & (DCX_DCEEMPTY | DCX_DCEBUSY)) != DCX_DCEBUSY) return 0;
 231
 232     /* restore previous visible region */
 233
 234     if ((dce->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) &&
 235         (dce->DCXflags & (DCX_CACHE | DCX_WINDOWPAINT)) )
 236         DCE_DeleteClipRgn( dce );
 237
 238     if (dce->DCXflags & DCX_CACHE)
 239     {
 240         SetDCState16( dce->hDC, defaultDCstate );
 241         dce->DCXflags &= ~DCX_DCEBUSY;
 242         if (dce->DCXflags & DCX_DCEDIRTY)
 243         {
 244             /* don't keep around invalidated entries
 245              * because SetDCState() disables hVisRgn updates
 246              * by removing dirty bit. */
 247
 248             dce->hwndCurrent = 0;
 249             dce->DCXflags &= DCX_CACHE;
 250             dce->DCXflags |= DCX_DCEEMPTY;
 251         }
 252     }
 253     return 1;
 254 }
 255
 256
 257 /***********************************************************************
 258  *   DCE_InvalidateDCE
 259  *
 260  * It is called from SetWindowPos() and EVENT_MapNotify - we have to
 261  * mark as dirty all busy DCEs for windows that have pWnd->parent as
 262  * an ansector and whose client rect intersects with specified update
 263  * rectangle. In addition, pWnd->parent DCEs may need to be updated if
 264  * DCX_CLIPCHILDREN flag is set.  */
 265 BOOL DCE_InvalidateDCE(WND* pWnd, const RECT* pRectUpdate)
 266 {
 267     WND* wndScope = WIN_LockWndPtr(pWnd->parent);
 268     WND *pDesktop = WIN_GetDesktop();
 269     BOOL bRet = FALSE;
 270
 271     if( wndScope )
 272     {
 273         DCE *dce;
 274
 275         TRACE("scope hwnd = %04x, (%i,%i - %i,%i)\n",
 276                      wndScope->hwndSelf, pRectUpdate->left,pRectUpdate->top,
 277                      pRectUpdate->right,pRectUpdate->bottom);
 278         if(TRACE_ON(dc))
 279           DCE_DumpCache();
 280
 281         /* walk all DCEs and fixup non-empty entries */
 282
 283         for (dce = firstDCE; (dce); dce = dce->next)
 284         {
 285             if( !(dce->DCXflags & DCX_DCEEMPTY) )
 286             {
 287                 WND* wndCurrent = WIN_FindWndPtr(dce->hwndCurrent);
 288
 289                 if( wndCurrent )
 290                 {
 291                     WND* wnd = NULL;
 292                     INT xoffset = 0, yoffset = 0;
 293
 294                     if( (wndCurrent == wndScope) && !(dce->DCXflags & DCX_CLIPCHILDREN) )
 295                     {
 296                         /* child window positions don't bother us */
 297                         WIN_ReleaseWndPtr(wndCurrent);
 298                         continue;
 299                     }
 300
 301                     if( !Options.desktopGeometry && wndCurrent == pDesktop )
 302                     {
 303                         /* don't bother with fake desktop */
 304                         WIN_ReleaseWndPtr(wndCurrent);
 305                         continue;
 306                     }
 307
 308                     /* check if DCE window is within the z-order scope */
 309
 310                     for( wnd = WIN_LockWndPtr(wndCurrent); wnd; WIN_UpdateWndPtr(&wnd,wnd->parent))
 311                     {
 312                         if( wnd == wndScope )
 313                         {
 314                             RECT wndRect;
 315
 316                             wndRect = wndCurrent->rectWindow;
 317
 318                             OffsetRect( &wndRect, xoffset - wndCurrent->rectClient.left,
 319                                                     yoffset - wndCurrent->rectClient.top);
 320
 321                             if (pWnd == wndCurrent ||
 322                                 IntersectRect( &wndRect, &wndRect, pRectUpdate ))
 323                             {
 324                                 if( !(dce->DCXflags & DCX_DCEBUSY) )
 325                                 {
 326                                     /* Don't bother with visible regions of unused DCEs */
 327
 328                                     TRACE("\tpurged %08x dce [%04x]\n",
 329                                                 (unsigned)dce, wndCurrent->hwndSelf);
 330
 331                                     dce->hwndCurrent = 0;
 332                                     dce->DCXflags &= DCX_CACHE;
 333                                     dce->DCXflags |= DCX_DCEEMPTY;
 334                                 }
 335                                 else
 336                                 {
 337                                     /* Set dirty bits in the hDC and DCE structs */
 338
 339                                     TRACE("\tfixed up %08x dce [%04x]\n",
 340                                                 (unsigned)dce, wndCurrent->hwndSelf);
 341
 342                                     dce->DCXflags |= DCX_DCEDIRTY;
 343                                     SetHookFlags16(dce->hDC, DCHF_INVALIDATEVISRGN);
 344                                     bRet = TRUE;
 345                                 }
 346                             }
 347                             WIN_ReleaseWndPtr(wnd);
 348                             break;
 349                         }
 350                         xoffset += wnd->rectClient.left;
 351                         yoffset += wnd->rectClient.top;
 352                     }
 353                 }
 354                 WIN_ReleaseWndPtr(wndCurrent);
 355             }
 356         } /* dce list */
 357         WIN_ReleaseWndPtr(wndScope);
 358     }
 359     WIN_ReleaseDesktop();
 360     return bRet;
 361 }
 362
 363 /***********************************************************************
 364  *           DCE_Init
 365  */
 366 void DCE_Init(void)
 367 {
 368     int i;
 369     DCE * dce;
 370
 371     for (i = 0; i < NB_DCE; i++)
 372     {
 373         if (!(dce = DCE_AllocDCE( 0, DCE_CACHE_DC ))) return;
 374         if (!defaultDCstate) defaultDCstate = GetDCState16( dce->hDC );
 375     }
 376 }
 377
 378
 379 /***********************************************************************
 380  *           DCE_GetVisRect
 381  *
 382  * Calculate the visible rectangle of a window (i.e. the client or
 383  * window area clipped by the client area of all ancestors) in the
 384  * corresponding coordinates. Return FALSE if the visible region is empty.
 385  */
 386 static BOOL DCE_GetVisRect( WND *wndPtr, BOOL clientArea, RECT *lprect )
 387 {
 388     *lprect = clientArea ? wndPtr->rectClient : wndPtr->rectWindow;
 389
 390     if (wndPtr->dwStyle & WS_VISIBLE)
 391     {
 392         INT xoffset = lprect->left;
 393         INT yoffset = lprect->top;
 394
 395         while( !(wndPtr->flags & WIN_NATIVE) &&
 396            ( wndPtr = WIN_LockWndPtr(wndPtr->parent)) )
 397         {
 398             if ( (wndPtr->dwStyle & (WS_ICONIC | WS_VISIBLE)) != WS_VISIBLE )
 399             {
 400                 WIN_ReleaseWndPtr(wndPtr);
 401                 goto fail;
 402             }
 403
 404             xoffset += wndPtr->rectClient.left;
 405             yoffset += wndPtr->rectClient.top;
 406             OffsetRect( lprect, wndPtr->rectClient.left,
 407                                   wndPtr->rectClient.top );
 408
 409             if( (wndPtr->rectClient.left >= wndPtr->rectClient.right) ||
 410                 (wndPtr->rectClient.top >= wndPtr->rectClient.bottom) ||
 411                 (lprect->left >= wndPtr->rectClient.right) ||
 412                 (lprect->right <= wndPtr->rectClient.left) ||
 413                 (lprect->top >= wndPtr->rectClient.bottom) ||
 414                 (lprect->bottom <= wndPtr->rectClient.top) )
 415             {
 416                 WIN_ReleaseWndPtr(wndPtr);
 417                 goto fail;
 418             }
 419
 420             lprect->left = max( lprect->left, wndPtr->rectClient.left );
 421             lprect->right = min( lprect->right, wndPtr->rectClient.right );
 422             lprect->top = max( lprect->top, wndPtr->rectClient.top );
 423             lprect->bottom = min( lprect->bottom, wndPtr->rectClient.bottom );
 424
 425             WIN_ReleaseWndPtr(wndPtr);
 426         }
 427         OffsetRect( lprect, -xoffset, -yoffset );
 428         return TRUE;
 429     }
 430
 431 fail:
 432     SetRectEmpty( lprect );
 433     return FALSE;
 434 }
 435
 436
 437 /***********************************************************************
 438  *           DCE_AddClipRects
 439  *
 440  * Go through the linked list of windows from pWndStart to pWndEnd,
 441  * adding to the clip region the intersection of the target rectangle
 442  * with an offset window rectangle.
 443  */
 444 static BOOL DCE_AddClipRects( WND *pWndStart, WND *pWndEnd,
 445                                 HRGN hrgnClip, LPRECT lpRect, int x, int y )
 446 {
 447     RECT rect;
 448
 449     if( pWndStart->pDriver->pIsSelfClipping( pWndStart ) )
 450         return TRUE; /* The driver itself will do the clipping */
 451
 452     for (WIN_LockWndPtr(pWndStart); (pWndStart && (pWndStart != pWndEnd)); WIN_UpdateWndPtr(&pWndStart,pWndStart->next))
 453     {
 454         if( !(pWndStart->dwStyle & WS_VISIBLE) ) continue;
 455
 456         rect.left = pWndStart->rectWindow.left + x;
 457         rect.top = pWndStart->rectWindow.top + y;
 458         rect.right = pWndStart->rectWindow.right + x;
 459         rect.bottom = pWndStart->rectWindow.bottom + y;
 460
 461         if( IntersectRect( &rect, &rect, lpRect ))
 462         {
 463             if(!REGION_UnionRectWithRgn( hrgnClip, &rect )) break;
 464         }
 465     }
 466     WIN_ReleaseWndPtr(pWndStart);
 467     return (pWndStart == pWndEnd);
 468 }
 469
 470
 471 /***********************************************************************
 472  *           DCE_GetVisRgn
 473  *
 474  * Return the visible region of a window, i.e. the client or window area
 475  * clipped by the client area of all ancestors, and then optionally
 476  * by siblings and children.
 477  */
 478 HRGN DCE_GetVisRgn( HWND hwnd, WORD flags, HWND hwndChild, WORD cflags )
 479 {
 480     HRGN hrgnVis = 0;
 481     RECT rect;
 482     WND *wndPtr = WIN_FindWndPtr( hwnd );
 483     WND *childWnd = WIN_FindWndPtr( hwndChild );
 484
 485     /* Get visible rectangle and create a region with it. */
 486
 487     if (wndPtr && DCE_GetVisRect(wndPtr, !(flags & DCX_WINDOW), &rect))
 488     {
 489         if((hrgnVis = CreateRectRgnIndirect( &rect )))
 490         {
 491             HRGN hrgnClip = CreateRectRgn( 0, 0, 0, 0 );
 492             INT xoffset, yoffset;
 493
 494             if( hrgnClip )
 495             {
 496                 /* Compute obscured region for the visible rectangle by
 497                  * clipping children, siblings, and ancestors. Note that
 498                  * DCE_GetVisRect() returns a rectangle either in client
 499                  * or in window coordinates (for DCX_WINDOW request). */
 500
 501                 if( (flags & DCX_CLIPCHILDREN) && wndPtr->child )
 502                 {
 503                     if( flags & DCX_WINDOW )
 504                     {
 505                         /* adjust offsets since child window rectangles are
 506                          * in client coordinates */
 507
 508                         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 509                         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 510                     }
 511                     else
 512                         xoffset = yoffset = 0;
 513
 514                     DCE_AddClipRects( wndPtr->child, NULL, hrgnClip,
 515                                       &rect, xoffset, yoffset );
 516                 }
 517
 518                 /* We may need to clip children of child window, if a window with PARENTDC
 519                  * class style and CLIPCHILDREN window style (like in Free Agent 16
 520                  * preference dialogs) gets here, we take the region for the parent window
 521                  * but apparently still need to clip the children of the child window... */
 522
 523                 if( (cflags & DCX_CLIPCHILDREN) && childWnd && childWnd->child )
 524                 {
 525                     if( flags & DCX_WINDOW )
 526                     {
 527                         /* adjust offsets since child window rectangles are
 528                          * in client coordinates */
 529
 530                         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 531                         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 532                     }
 533                     else
 534                         xoffset = yoffset = 0;
 535
 536                     /* client coordinates of child window */
 537                     xoffset += childWnd->rectClient.left;
 538                     yoffset += childWnd->rectClient.top;
 539
 540                     DCE_AddClipRects( childWnd->child, NULL, hrgnClip,
 541                                       &rect, xoffset, yoffset );
 542                 }
 543
 544                 /* sibling window rectangles are in client
 545                  * coordinates of the parent window */
 546
 547                 if (flags & DCX_WINDOW)
 548                 {
 549                     xoffset = -wndPtr->rectWindow.left;
 550                     yoffset = -wndPtr->rectWindow.top;
 551                 }
 552                 else
 553                 {
 554                     xoffset = -wndPtr->rectClient.left;
 555                     yoffset = -wndPtr->rectClient.top;
 556                 }
 557
 558                 if (flags & DCX_CLIPSIBLINGS && wndPtr->parent )
 559                     DCE_AddClipRects( wndPtr->parent->child,
 560                                       wndPtr, hrgnClip, &rect, xoffset, yoffset );
 561
 562                 /* Clip siblings of all ancestors that have the
 563                  * WS_CLIPSIBLINGS style
 564                  */
 565
 566                 while (wndPtr->dwStyle & WS_CHILD)
 567                 {
 568                     WIN_UpdateWndPtr(&wndPtr,wndPtr->parent);
 569                     xoffset -= wndPtr->rectClient.left;
 570                     yoffset -= wndPtr->rectClient.top;
 571                     if(wndPtr->dwStyle & WS_CLIPSIBLINGS && wndPtr->parent)
 572                     {
 573                         DCE_AddClipRects( wndPtr->parent->child, wndPtr,
 574                                           hrgnClip, &rect, xoffset, yoffset );
 575                     }
 576                 }
 577
 578                 /* Now once we've got a jumbo clip region we have
 579                  * to substract it from the visible rectangle.
 580                  */
 581
 582                 CombineRgn( hrgnVis, hrgnVis, hrgnClip, RGN_DIFF );
 583                 DeleteObject( hrgnClip );
 584             }
 585             else
 586             {
 587                 DeleteObject( hrgnVis );
 588                 hrgnVis = 0;
 589             }
 590         }
 591     }
 592     else
 593         hrgnVis = CreateRectRgn(0, 0, 0, 0); /* empty */
 594     WIN_ReleaseWndPtr(wndPtr);
 595     WIN_ReleaseWndPtr(childWnd);
 596     return hrgnVis;
 597 }
 598
 599 /***********************************************************************
 600  *           DCE_OffsetVisRgn
 601  *
 602  * Change region from DC-origin relative coordinates to screen coords.
 603  */
 604
 605 static void DCE_OffsetVisRgn( HDC hDC, HRGN hVisRgn )
 606 {
 607     DC *dc;
 608     if (!(dc = DC_GetDCPtr( hDC ))) return;
 609
 610     OffsetRgn( hVisRgn, dc->DCOrgX, dc->DCOrgY );
 611
 612     GDI_ReleaseObj( hDC );
 613 }
 614
 615 /***********************************************************************
 616  *           DCE_ExcludeRgn
 617  *
 618  *  Translate given region from the wnd client to the DC coordinates
 619  *  and add it to the clipping region.
 620  */
 621 INT DCE_ExcludeRgn( HDC hDC, WND* wnd, HRGN hRgn )
 622 {
 623   POINT  pt = {0, 0};
 624   DCE     *dce = firstDCE;
 625
 626   while (dce && (dce->hDC != hDC)) dce = dce->next;
 627   if( dce )
 628   {
 629       MapWindowPoints( wnd->hwndSelf, dce->hwndCurrent, &pt, 1);
 630       if( dce->DCXflags & DCX_WINDOW )
 631       {
 632           wnd = WIN_FindWndPtr(dce->hwndCurrent);
 633           pt.x += wnd->rectClient.left - wnd->rectWindow.left;
 634           pt.y += wnd->rectClient.top - wnd->rectWindow.top;
 635           WIN_ReleaseWndPtr(wnd);
 636       }
 637   }
 638   else return ERROR;
 639   OffsetRgn(hRgn, pt.x, pt.y);
 640
 641   return ExtSelectClipRgn( hDC, hRgn, RGN_DIFF );
 642 }
 643
 644
 645 /***********************************************************************
 646  *           GetDCEx16    (USER.359)
 647  */
 648 HDC16 WINAPI GetDCEx16( HWND16 hwnd, HRGN16 hrgnClip, DWORD flags )
 649 {
 650     return (HDC16)GetDCEx( hwnd, hrgnClip, flags );
 651 }
 652
 653
 654 /***********************************************************************
 655  *           GetDCEx    (USER32.231)
 656  *
 657  * Unimplemented flags: DCX_LOCKWINDOWUPDATE
 658  *
 659  * FIXME: Full support for hrgnClip == 1 (alias for entire window).
 660  */
 661 HDC WINAPI GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags )
 662 {
 663     HRGN        hrgnVisible = 0;
 664     HDC         hdc = 0;
 665     DCE *       dce;
 666     DC *        dc;
 667     WND *       wndPtr;
 668     DWORD       dcxFlags = 0;
 669     BOOL        bUpdateVisRgn = TRUE;
 670     BOOL        bUpdateClipOrigin = FALSE;
 671
 672     TRACE("hwnd %04x, hrgnClip %04x, flags %08x\n",
 673                                 hwnd, hrgnClip, (unsigned)flags);
 674
 675     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 676
 677     /* fixup flags */
 678
 679     if (!(wndPtr->class->style & (CS_OWNDC | CS_CLASSDC))) flags |= DCX_CACHE;
 680
 681     if (flags & DCX_USESTYLE)
 682     {
 683         flags &= ~( DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP);
 684
 685         if( wndPtr->dwStyle & WS_CLIPSIBLINGS )
 686             flags |= DCX_CLIPSIBLINGS;
 687
 688         if ( !(flags & DCX_WINDOW) )
 689         {
 690             if (wndPtr->class->style & CS_PARENTDC) flags |= DCX_PARENTCLIP;
 691
 692             if (wndPtr->dwStyle & WS_CLIPCHILDREN &&
 693                      !(wndPtr->dwStyle & WS_MINIMIZE) ) flags |= DCX_CLIPCHILDREN;
 694         }
 695         else flags |= DCX_CACHE;
 696     }
 697
 698     if( flags & DCX_NOCLIPCHILDREN )
 699     {
 700         flags |= DCX_CACHE;
 701         flags &= ~(DCX_PARENTCLIP | DCX_CLIPCHILDREN);
 702     }
 703
 704     if (flags & DCX_WINDOW)
 705         flags = (flags & ~DCX_CLIPCHILDREN) | DCX_CACHE;
 706
 707     if (!(wndPtr->dwStyle & WS_CHILD) || !wndPtr->parent )
 708         flags &= ~DCX_PARENTCLIP;
 709     else if( flags & DCX_PARENTCLIP )
 710     {
 711         flags |= DCX_CACHE;
 712         if( !(flags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN)) )
 713             if( (wndPtr->dwStyle & WS_VISIBLE) && (wndPtr->parent->dwStyle & WS_VISIBLE) )
 714             {
 715                 flags &= ~DCX_CLIPCHILDREN;
 716                 if( wndPtr->parent->dwStyle & WS_CLIPSIBLINGS )
 717                     flags |= DCX_CLIPSIBLINGS;
 718             }
 719     }
 720
 721     /* find a suitable DCE */
 722
 723     dcxFlags = flags & (DCX_PARENTCLIP | DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN |
 724                         DCX_CACHE | DCX_WINDOW);
 725
 726     if (flags & DCX_CACHE)
 727     {
 728         DCE*    dceEmpty;
 729         DCE*    dceUnused;
 730
 731         dceEmpty = dceUnused = NULL;
 732
 733         /* Strategy: First, we attempt to find a non-empty but unused DCE with
 734          * compatible flags. Next, we look for an empty entry. If the cache is
 735          * full we have to purge one of the unused entries.
 736          */
 737
 738         for (dce = firstDCE; (dce); dce = dce->next)
 739         {
 740             if ((dce->DCXflags & (DCX_CACHE | DCX_DCEBUSY)) == DCX_CACHE )
 741             {
 742                 dceUnused = dce;
 743
 744                 if (dce->DCXflags & DCX_DCEEMPTY)
 745                     dceEmpty = dce;
 746                 else
 747                 if ((dce->hwndCurrent == hwnd) &&
 748                    ((dce->DCXflags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN |
 749                                       DCX_CACHE | DCX_WINDOW | DCX_PARENTCLIP)) == dcxFlags))
 750                 {
 751                     TRACE("\tfound valid %08x dce [%04x], flags %08x\n",
 752                                         (unsigned)dce, hwnd, (unsigned)dcxFlags );
 753                     bUpdateVisRgn = FALSE;
 754                     bUpdateClipOrigin = TRUE;
 755                     break;
 756                 }
 757             }
 758         }
 759
 760         if (!dce) dce = (dceEmpty) ? dceEmpty : dceUnused;
 761
 762         /* if there's no dce empty or unused, allocate a new one */
 763         if (!dce)
 764         {
 765             dce = DCE_AllocDCE( 0, DCE_CACHE_DC );
 766         }
 767     }
 768     else
 769     {
 770         dce = (wndPtr->class->style & CS_OWNDC) ? wndPtr->dce : wndPtr->class->dce;
 771         if( dce->hwndCurrent == hwnd )
 772         {
 773             TRACE("\tskipping hVisRgn update\n");
 774             bUpdateVisRgn = FALSE; /* updated automatically, via DCHook() */
 775
 776             /* Abey - 16Jul99. to take care of the nested GetDC. first one
 777                with DCX_EXCLUDERGN or DCX_INTERSECTRGN flags and the next
 778                one with or without these flags. */
 779
 780             if(dce->DCXflags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN))
 781             {
 782                 /* This is likely to be a nested BeginPaint().
 783                    or a BeginPaint() followed by a GetDC()*/
 784
 785                 if( dce->hClipRgn != hrgnClip )
 786                 {
 787                     FIXME("new hrgnClip[%04x] smashes the previous[%04x]\n",
 788                           hrgnClip, dce->hClipRgn );
 789                     DCE_DeleteClipRgn( dce );
 790                 }
 791                 else
 792                     RestoreVisRgn16(dce->hDC);
 793             }
 794         }
 795     }
 796     if (!dce)
 797     {
 798         hdc = 0;
 799         goto END;
 800     }
 801
 802     dce->hwndCurrent = hwnd;
 803     dce->hClipRgn = 0;
 804     dce->DCXflags = dcxFlags | (flags & DCX_WINDOWPAINT) | DCX_DCEBUSY;
 805     hdc = dce->hDC;
 806
 807     if (!(dc = DC_GetDCPtr( hdc )))
 808     {
 809         hdc = 0;
 810         goto END;
 811     }
 812     bUpdateVisRgn = bUpdateVisRgn || (dc->flags & DC_DIRTY);
 813
 814     /* recompute visible region */
 815     wndPtr->pDriver->pSetDrawable( wndPtr, hdc, flags, bUpdateClipOrigin );
 816     dc->flags &= ~DC_DIRTY;
 817     GDI_ReleaseObj( hdc );
 818
 819     if( bUpdateVisRgn )
 820     {
 821         TRACE("updating visrgn for %08x dce, hwnd [%04x]\n", (unsigned)dce, hwnd);
 822
 823         if (flags & DCX_PARENTCLIP)
 824         {
 825             WND *parentPtr = WIN_LockWndPtr(wndPtr->parent);
 826
 827             if( wndPtr->dwStyle & WS_VISIBLE && !(parentPtr->dwStyle & WS_MINIMIZE) )
 828             {
 829                 if( parentPtr->dwStyle & WS_CLIPSIBLINGS )
 830                     dcxFlags = DCX_CLIPSIBLINGS | (flags & ~(DCX_CLIPCHILDREN | DCX_WINDOW));
 831                 else
 832                     dcxFlags = flags & ~(DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | DCX_WINDOW);
 833
 834                 hrgnVisible = DCE_GetVisRgn( parentPtr->hwndSelf, dcxFlags,
 835                                              wndPtr->hwndSelf, flags );
 836                 if( flags & DCX_WINDOW )
 837                     OffsetRgn( hrgnVisible, -wndPtr->rectWindow.left,
 838                                               -wndPtr->rectWindow.top );
 839                 else
 840                     OffsetRgn( hrgnVisible, -wndPtr->rectClient.left,
 841                                               -wndPtr->rectClient.top );
 842                 DCE_OffsetVisRgn( hdc, hrgnVisible );
 843             }
 844             else
 845                 hrgnVisible = CreateRectRgn( 0, 0, 0, 0 );
 846             WIN_ReleaseWndPtr(parentPtr);
 847         }
 848         else
 849             if ((hwnd == GetDesktopWindow()) && !USER_Driver.pIsSingleWindow())
 850                  hrgnVisible = CreateRectRgn( 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN) );
 851             else
 852             {
 853                 hrgnVisible = DCE_GetVisRgn( hwnd, flags, 0, 0 );
 854                 DCE_OffsetVisRgn( hdc, hrgnVisible );
 855             }
 856
 857         dce->DCXflags &= ~DCX_DCEDIRTY;
 858         SelectVisRgn16( hdc, hrgnVisible );
 859     }
 860     else
 861         TRACE("no visrgn update %08x dce, hwnd [%04x]\n", (unsigned)dce, hwnd);
 862
 863     /* apply additional region operation (if any) */
 864
 865     if( flags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN) )
 866     {
 867         if( !hrgnVisible ) hrgnVisible = CreateRectRgn( 0, 0, 0, 0 );
 868
 869         dce->DCXflags |= flags & (DCX_KEEPCLIPRGN | DCX_INTERSECTRGN | DCX_EXCLUDERGN);
 870         dce->hClipRgn = hrgnClip;
 871
 872         TRACE("\tsaved VisRgn, clipRgn = %04x\n", hrgnClip);
 873
 874         SaveVisRgn16( hdc );
 875         CombineRgn( hrgnVisible, hrgnClip, 0, RGN_COPY );
 876         DCE_OffsetVisRgn( hdc, hrgnVisible );
 877         CombineRgn( hrgnVisible, InquireVisRgn16( hdc ), hrgnVisible,
 878                       (flags & DCX_INTERSECTRGN) ? RGN_AND : RGN_DIFF );
 879         SelectVisRgn16( hdc, hrgnVisible );
 880     }
 881
 882     if( hrgnVisible ) DeleteObject( hrgnVisible );
 883
 884     TRACE("(%04x,%04x,0x%lx): returning %04x\n",
 885                hwnd, hrgnClip, flags, hdc);
 886 END:
 887     WIN_ReleaseWndPtr(wndPtr);
 888     return hdc;
 889 }
 890
 891
 892 /***********************************************************************
 893  *           GetDC16    (USER.66)
 894  */
 895 HDC16 WINAPI GetDC16( HWND16 hwnd )
 896 {
 897     return (HDC16)GetDC( hwnd );
 898 }
 899
 900
 901 /***********************************************************************
 902  *           GetDC    (USER32.230)
 903  * RETURNS
 904  *      :Handle to DC
 905  *      NULL: Failure
 906  */
 907 HDC WINAPI GetDC(
 908              HWND hwnd /* [in] handle of window */
 909 ) {
 910     if (!hwnd)
 911         return GetDCEx( GetDesktopWindow(), 0, DCX_CACHE | DCX_WINDOW );
 912     return GetDCEx( hwnd, 0, DCX_USESTYLE );
 913 }
 914
 915
 916 /***********************************************************************
 917  *           GetWindowDC16    (USER.67)
 918  */
 919 HDC16 WINAPI GetWindowDC16( HWND16 hwnd )
 920 {
 921     if (!hwnd) hwnd = GetDesktopWindow16();
 922     return GetDCEx16( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
 923 }
 924
 925
 926 /***********************************************************************
 927  *           GetWindowDC    (USER32.304)
 928  */
 929 HDC WINAPI GetWindowDC( HWND hwnd )
 930 {
 931     if (!hwnd) hwnd = GetDesktopWindow();
 932     return GetDCEx( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
 933 }
 934
 935
 936 /***********************************************************************
 937  *           ReleaseDC16    (USER.68)
 938  */
 939 INT16 WINAPI ReleaseDC16( HWND16 hwnd, HDC16 hdc )
 940 {
 941     return (INT16)ReleaseDC( hwnd, hdc );
 942 }
 943
 944
 945 /***********************************************************************
 946  *           ReleaseDC    (USER32.440)
 947  *
 948  * RETURNS
 949  *      1: Success
 950  *      0: Failure
 951  */
 952 INT WINAPI ReleaseDC(
 953              HWND hwnd /* [in] Handle of window - ignored */,
 954              HDC hdc   /* [in] Handle of device context */
 955 ) {
 956     DCE * dce;
 957     INT nRet = 0;
 958
 959     WIN_LockWnds();
 960     dce = firstDCE;
 961
 962     TRACE("%04x %04x\n", hwnd, hdc );
 963
 964     while (dce && (dce->hDC != hdc)) dce = dce->next;
 965
 966     if ( dce )
 967         if ( dce->DCXflags & DCX_DCEBUSY )
 968             nRet = DCE_ReleaseDC( dce );
 969
 970     WIN_UnlockWnds();
 971
 972     return nRet;
 973 }
 974
 975 /***********************************************************************
 976  *           DCHook    (USER.362)
 977  *
 978  * See "Undoc. Windows" for hints (DC, SetDCHook, SetHookFlags)..
 979  */
 980 BOOL16 WINAPI DCHook16( HDC16 hDC, WORD code, DWORD data, LPARAM lParam )
 981 {
 982     BOOL retv = TRUE;
 983     HRGN hVisRgn;
 984     DCE *dce = (DCE *)data;
 985     WND *wndPtr;
 986
 987     TRACE("hDC = %04x, %i\n", hDC, code);
 988
 989     if (!dce) return 0;
 990     assert(dce->hDC == hDC);
 991
 992     /* Grab the windows lock before doing anything else  */
 993     WIN_LockWnds();
 994
 995     switch( code )
 996     {
 997       case DCHC_INVALIDVISRGN:
 998
 999            /* GDI code calls this when it detects that the
1000             * DC is dirty (usually after SetHookFlags()). This
1001             * means that we have to recompute the visible region.
1002             */
1003
1004            if( dce->DCXflags & DCX_DCEBUSY )
1005            {
1006
1007                /* Update stale DC in DCX */
1008                wndPtr = WIN_FindWndPtr( dce->hwndCurrent);
1009                if (wndPtr) wndPtr->pDriver->pSetDrawable( wndPtr, dce->hDC, dce->DCXflags, TRUE);
1010
1011                SetHookFlags16(hDC, DCHF_VALIDATEVISRGN);
1012                hVisRgn = DCE_GetVisRgn(dce->hwndCurrent, dce->DCXflags, 0, 0);
1013
1014                TRACE("\tapplying saved clipRgn\n");
1015
1016                /* clip this region with saved clipping region */
1017
1018                if ( (dce->DCXflags & DCX_INTERSECTRGN && dce->hClipRgn != 1) ||
1019                   (  dce->DCXflags & DCX_EXCLUDERGN && dce->hClipRgn) )
1020                {
1021
1022                     if( (!dce->hClipRgn && dce->DCXflags & DCX_INTERSECTRGN) ||
1023                          (dce->hClipRgn == 1 && dce->DCXflags & DCX_EXCLUDERGN) )
1024                          SetRectRgn(hVisRgn,0,0,0,0);
1025                     else
1026                          CombineRgn(hVisRgn, hVisRgn, dce->hClipRgn,
1027                                       (dce->DCXflags & DCX_EXCLUDERGN)? RGN_DIFF:RGN_AND);
1028                }
1029                dce->DCXflags &= ~DCX_DCEDIRTY;
1030                DCE_OffsetVisRgn( hDC, hVisRgn );
1031                SelectVisRgn16(hDC, hVisRgn);
1032                DeleteObject( hVisRgn );
1033               WIN_ReleaseWndPtr( wndPtr );  /* Release WIN_FindWndPtr lock */
1034            }
1035            else /* non-fatal but shouldn't happen */
1036              WARN("DC is not in use!\n");
1037            break;
1038
1039       case DCHC_DELETEDC:
1040            /*
1041             * Windows will not let you delete a DC that is busy
1042             * (between GetDC and ReleaseDC)
1043             */
1044
1045            if ( dce->DCXflags & DCX_DCEBUSY )
1046            {
1047                WARN("Application trying to delete a busy DC\n");
1048                retv = FALSE;
1049            }
1050            break;
1051
1052       default:
1053            FIXME("unknown code\n");
1054     }
1055
1056   WIN_UnlockWnds();  /* Release the wnd lock */
1057   return retv;
1058 }
1059
1060
1061 /**********************************************************************
1062  *          WindowFromDC16   (USER.117)
1063  */
1064 HWND16 WINAPI WindowFromDC16( HDC16 hDC )
1065 {
1066     return (HWND16)WindowFromDC( hDC );
1067 }
1068
1069
1070 /**********************************************************************
1071  *          WindowFromDC   (USER32.581)
1072  */
1073 HWND WINAPI WindowFromDC( HDC hDC )
1074 {
1075     DCE *dce;
1076     HWND hwnd;
1077
1078     WIN_LockWnds();
1079     dce = firstDCE;
1080
1081     while (dce && (dce->hDC != hDC)) dce = dce->next;
1082
1083     hwnd = dce ? dce->hwndCurrent : 0;
1084     WIN_UnlockWnds();
1085
1086     return hwnd;
1087 }
1088
1089
1090 /***********************************************************************
1091  *           LockWindowUpdate16   (USER.294)
1092  */
1093 BOOL16 WINAPI LockWindowUpdate16( HWND16 hwnd )
1094 {
1095     return LockWindowUpdate( hwnd );
1096 }
1097
1098
1099 /***********************************************************************
1100  *           LockWindowUpdate   (USER32.378)
1101  */
1102 BOOL WINAPI LockWindowUpdate( HWND hwnd )
1103 {
1104     /* FIXME? DCX_LOCKWINDOWUPDATE is unimplemented */
1105     return TRUE;
1106 }