| /* |
| * USER DCE functions |
| * |
| * Copyright 1993 Alexandre Julliard |
| * 1996,1997 Alex Korobka |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * |
| * Note: Visible regions of CS_OWNDC/CS_CLASSDC window DCs |
| * have to be updated dynamically. |
| * |
| * Internal DCX flags: |
| * |
| * DCX_DCEEMPTY - dce is uninitialized |
| * DCX_DCEBUSY - dce is in use |
| * DCX_DCEDIRTY - ReleaseDC() should wipe instead of caching |
| * DCX_KEEPCLIPRGN - ReleaseDC() should not delete the clipping region |
| * DCX_WINDOWPAINT - BeginPaint() is in effect |
| */ |
| |
| #include <assert.h> |
| #include "dce.h" |
| #include "win.h" |
| #include "gdi.h" |
| #include "user.h" |
| #include "wine/debug.h" |
| #include "windef.h" |
| #include "wingdi.h" |
| #include "wownt32.h" |
| #include "wine/winbase16.h" |
| #include "wine/winuser16.h" |
| |
| WINE_DEFAULT_DEBUG_CHANNEL(dc); |
| |
| static DCE *firstDCE; |
| static HDC16 defaultDCstate; |
| |
| static void DCE_DeleteClipRgn( DCE* ); |
| static INT DCE_ReleaseDC( DCE* ); |
| |
| |
| /*********************************************************************** |
| * DCE_DumpCache |
| */ |
| static void DCE_DumpCache(void) |
| { |
| DCE *dce; |
| |
| USER_Lock(); |
| dce = firstDCE; |
| |
| DPRINTF("DCE:\n"); |
| while( dce ) |
| { |
| DPRINTF("\t[0x%08x] hWnd %p, dcx %08x, %s %s\n", |
| (unsigned)dce, dce->hwndCurrent, (unsigned)dce->DCXflags, |
| (dce->DCXflags & DCX_CACHE) ? "Cache" : "Owned", |
| (dce->DCXflags & DCX_DCEBUSY) ? "InUse" : "" ); |
| dce = dce->next; |
| } |
| |
| USER_Unlock(); |
| } |
| |
| /*********************************************************************** |
| * DCE_AllocDCE |
| * |
| * Allocate a new DCE. |
| */ |
| DCE *DCE_AllocDCE( HWND hWnd, DCE_TYPE type ) |
| { |
| DCE * dce; |
| |
| if (!(dce = HeapAlloc( GetProcessHeap(), 0, sizeof(DCE) ))) return NULL; |
| if (!(dce->hDC = CreateDCA( "DISPLAY", NULL, NULL, NULL ))) |
| { |
| HeapFree( GetProcessHeap(), 0, dce ); |
| return 0; |
| } |
| if (!defaultDCstate) defaultDCstate = GetDCState16( HDC_16(dce->hDC) ); |
| |
| /* store DCE handle in DC hook data field */ |
| |
| SetDCHook( dce->hDC, DCHook16, (DWORD)dce ); |
| |
| dce->hwndCurrent = WIN_GetFullHandle( hWnd ); |
| dce->hClipRgn = 0; |
| |
| if( type != DCE_CACHE_DC ) /* owned or class DC */ |
| { |
| dce->DCXflags = DCX_DCEBUSY; |
| if( hWnd ) |
| { |
| LONG style = GetWindowLongW( hWnd, GWL_STYLE ); |
| if (style & WS_CLIPCHILDREN) dce->DCXflags |= DCX_CLIPCHILDREN; |
| if (style & WS_CLIPSIBLINGS) dce->DCXflags |= DCX_CLIPSIBLINGS; |
| } |
| SetHookFlags16( HDC_16(dce->hDC), DCHF_INVALIDATEVISRGN ); |
| } |
| else dce->DCXflags = DCX_CACHE | DCX_DCEEMPTY; |
| |
| USER_Lock(); |
| dce->next = firstDCE; |
| firstDCE = dce; |
| USER_Unlock(); |
| return dce; |
| } |
| |
| |
| /*********************************************************************** |
| * DCE_FreeDCE |
| */ |
| DCE* DCE_FreeDCE( DCE *dce ) |
| { |
| DCE **ppDCE, *ret; |
| |
| if (!dce) return NULL; |
| |
| USER_Lock(); |
| |
| ppDCE = &firstDCE; |
| |
| while (*ppDCE && (*ppDCE != dce)) ppDCE = &(*ppDCE)->next; |
| if (*ppDCE == dce) *ppDCE = dce->next; |
| ret = *ppDCE; |
| USER_Unlock(); |
| |
| SetDCHook(dce->hDC, NULL, 0L); |
| |
| DeleteDC( dce->hDC ); |
| if( dce->hClipRgn && !(dce->DCXflags & DCX_KEEPCLIPRGN) ) |
| DeleteObject(dce->hClipRgn); |
| HeapFree( GetProcessHeap(), 0, dce ); |
| |
| return ret; |
| } |
| |
| /*********************************************************************** |
| * DCE_FreeWindowDCE |
| * |
| * Remove owned DCE and reset unreleased cache DCEs. |
| */ |
| void DCE_FreeWindowDCE( HWND hwnd ) |
| { |
| DCE *pDCE; |
| WND *pWnd = WIN_GetPtr( hwnd ); |
| |
| pDCE = firstDCE; |
| while( pDCE ) |
| { |
| if( pDCE->hwndCurrent == hwnd ) |
| { |
| if( pDCE == pWnd->dce ) /* owned or Class DCE*/ |
| { |
| if (pWnd->clsStyle & CS_OWNDC) /* owned DCE*/ |
| { |
| pDCE = DCE_FreeDCE( pDCE ); |
| pWnd->dce = NULL; |
| continue; |
| } |
| else if( pDCE->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN) ) /* Class DCE*/ |
| { |
| if (USER_Driver.pReleaseDC) |
| USER_Driver.pReleaseDC( pDCE->hwndCurrent, pDCE->hDC ); |
| DCE_DeleteClipRgn( pDCE ); |
| pDCE->hwndCurrent = 0; |
| } |
| } |
| else |
| { |
| if( pDCE->DCXflags & DCX_DCEBUSY ) /* shared cache DCE */ |
| { |
| /* FIXME: AFAICS we are doing the right thing here so |
| * this should be a WARN. But this is best left as an ERR |
| * because the 'application error' is likely to come from |
| * another part of Wine (i.e. it's our fault after all). |
| * We should change this to WARN when Wine is more stable |
| * (for 1.0?). |
| */ |
| ERR("[%p] GetDC() without ReleaseDC()!\n",hwnd); |
| DCE_ReleaseDC( pDCE ); |
| } |
| |
| if (pDCE->hwndCurrent && USER_Driver.pReleaseDC) |
| USER_Driver.pReleaseDC( pDCE->hwndCurrent, pDCE->hDC ); |
| pDCE->DCXflags &= DCX_CACHE; |
| pDCE->DCXflags |= DCX_DCEEMPTY; |
| pDCE->hwndCurrent = 0; |
| } |
| } |
| pDCE = pDCE->next; |
| } |
| WIN_ReleasePtr( pWnd ); |
| } |
| |
| |
| /*********************************************************************** |
| * DCE_DeleteClipRgn |
| */ |
| static void DCE_DeleteClipRgn( DCE* dce ) |
| { |
| dce->DCXflags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN | DCX_WINDOWPAINT); |
| |
| if( dce->DCXflags & DCX_KEEPCLIPRGN ) |
| dce->DCXflags &= ~DCX_KEEPCLIPRGN; |
| else |
| if( dce->hClipRgn > (HRGN)1 ) |
| DeleteObject( dce->hClipRgn ); |
| |
| dce->hClipRgn = 0; |
| |
| /* make it dirty so that the vis rgn gets recomputed next time */ |
| dce->DCXflags |= DCX_DCEDIRTY; |
| SetHookFlags16( HDC_16(dce->hDC), DCHF_INVALIDATEVISRGN ); |
| } |
| |
| |
| /*********************************************************************** |
| * DCE_ReleaseDC |
| */ |
| static INT DCE_ReleaseDC( DCE* dce ) |
| { |
| if ((dce->DCXflags & (DCX_DCEEMPTY | DCX_DCEBUSY)) != DCX_DCEBUSY) return 0; |
| |
| /* restore previous visible region */ |
| |
| if ((dce->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) && |
| (dce->DCXflags & (DCX_CACHE | DCX_WINDOWPAINT)) ) |
| DCE_DeleteClipRgn( dce ); |
| |
| if (dce->DCXflags & DCX_CACHE) |
| { |
| /* make the DC clean so that SetDCState doesn't try to update the vis rgn */ |
| SetHookFlags16( HDC_16(dce->hDC), DCHF_VALIDATEVISRGN ); |
| SetDCState16( HDC_16(dce->hDC), defaultDCstate ); |
| dce->DCXflags &= ~DCX_DCEBUSY; |
| if (dce->DCXflags & DCX_DCEDIRTY) |
| { |
| /* don't keep around invalidated entries |
| * because SetDCState() disables hVisRgn updates |
| * by removing dirty bit. */ |
| if (dce->hwndCurrent && USER_Driver.pReleaseDC) |
| USER_Driver.pReleaseDC( dce->hwndCurrent, dce->hDC ); |
| dce->hwndCurrent = 0; |
| dce->DCXflags &= DCX_CACHE; |
| dce->DCXflags |= DCX_DCEEMPTY; |
| } |
| } |
| return 1; |
| } |
| |
| |
| /*********************************************************************** |
| * DCE_InvalidateDCE |
| * |
| * It is called from SetWindowPos() and EVENT_MapNotify - we have to |
| * mark as dirty all busy DCEs for windows that have pWnd->parent as |
| * an ancestor and whose client rect intersects with specified update |
| * rectangle. In addition, pWnd->parent DCEs may need to be updated if |
| * DCX_CLIPCHILDREN flag is set. */ |
| BOOL DCE_InvalidateDCE(HWND hwnd, const RECT* pRectUpdate) |
| { |
| HWND hwndScope = GetAncestor( hwnd, GA_PARENT ); |
| BOOL bRet = FALSE; |
| |
| if( hwndScope ) |
| { |
| DCE *dce; |
| |
| TRACE("scope hwnd = %p, (%i,%i - %i,%i)\n", |
| hwndScope, pRectUpdate->left,pRectUpdate->top, |
| pRectUpdate->right,pRectUpdate->bottom); |
| if(TRACE_ON(dc)) |
| DCE_DumpCache(); |
| |
| /* walk all DCEs and fixup non-empty entries */ |
| |
| for (dce = firstDCE; (dce); dce = dce->next) |
| { |
| if (dce->DCXflags & DCX_DCEEMPTY) continue; |
| if ((dce->hwndCurrent == hwndScope) && !(dce->DCXflags & DCX_CLIPCHILDREN)) |
| continue; /* child window positions don't bother us */ |
| |
| /* check if DCE window is within the z-order scope */ |
| |
| if (hwndScope == dce->hwndCurrent || IsChild( hwndScope, dce->hwndCurrent )) |
| { |
| if (hwnd != dce->hwndCurrent) |
| { |
| /* check if the window rectangle intersects this DCE window */ |
| RECT rect; |
| GetWindowRect( dce->hwndCurrent, &rect ); |
| MapWindowPoints( 0, hwndScope, (POINT *)&rect, 2 ); |
| if (!IntersectRect( &rect, &rect, pRectUpdate )) continue; |
| |
| } |
| if( !(dce->DCXflags & DCX_DCEBUSY) ) |
| { |
| /* Don't bother with visible regions of unused DCEs */ |
| |
| TRACE("\tpurged %p dce [%p]\n", dce, dce->hwndCurrent); |
| if (dce->hwndCurrent && USER_Driver.pReleaseDC) |
| USER_Driver.pReleaseDC( dce->hwndCurrent, dce->hDC ); |
| dce->hwndCurrent = 0; |
| dce->DCXflags &= DCX_CACHE; |
| dce->DCXflags |= DCX_DCEEMPTY; |
| } |
| else |
| { |
| /* Set dirty bits in the hDC and DCE structs */ |
| |
| TRACE("\tfixed up %p dce [%p]\n", dce, dce->hwndCurrent); |
| dce->DCXflags |= DCX_DCEDIRTY; |
| SetHookFlags16( HDC_16(dce->hDC), DCHF_INVALIDATEVISRGN ); |
| bRet = TRUE; |
| } |
| } |
| } /* dce list */ |
| } |
| return bRet; |
| } |
| |
| |
| /*********************************************************************** |
| * DCE_ExcludeRgn |
| * |
| * Translate given region from the wnd client to the DC coordinates |
| * and add it to the clipping region. |
| */ |
| INT DCE_ExcludeRgn( HDC hDC, HWND hwnd, HRGN hRgn ) |
| { |
| POINT pt = {0, 0}; |
| DCE *dce = firstDCE; |
| |
| while (dce && (dce->hDC != hDC)) dce = dce->next; |
| if (!dce) return ERROR; |
| |
| MapWindowPoints( hwnd, dce->hwndCurrent, &pt, 1); |
| if( dce->DCXflags & DCX_WINDOW ) |
| { |
| WND *wnd = WIN_FindWndPtr(dce->hwndCurrent); |
| pt.x += wnd->rectClient.left - wnd->rectWindow.left; |
| pt.y += wnd->rectClient.top - wnd->rectWindow.top; |
| WIN_ReleaseWndPtr(wnd); |
| } |
| OffsetRgn(hRgn, pt.x, pt.y); |
| |
| return ExtSelectClipRgn( hDC, hRgn, RGN_DIFF ); |
| } |
| |
| |
| /*********************************************************************** |
| * GetDCEx (USER32.@) |
| * |
| * Unimplemented flags: DCX_LOCKWINDOWUPDATE |
| * |
| * FIXME: Full support for hrgnClip == 1 (alias for entire window). |
| */ |
| HDC WINAPI GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags ) |
| { |
| HDC hdc = 0; |
| DCE * dce; |
| WND * wndPtr; |
| DWORD dcxFlags = 0; |
| BOOL bUpdateVisRgn = TRUE; |
| BOOL bUpdateClipOrigin = FALSE; |
| HWND parent, full; |
| |
| TRACE("hwnd %p, hrgnClip %p, flags %08lx\n", hwnd, hrgnClip, flags); |
| |
| if (!hwnd) hwnd = GetDesktopWindow(); |
| if (!(full = WIN_IsCurrentProcess( hwnd ))) |
| { |
| FIXME( "not supported yet on other process window %p\n", hwnd ); |
| return 0; |
| } |
| hwnd = full; |
| if (!(wndPtr = WIN_GetPtr( hwnd ))) return 0; |
| |
| /* fixup flags */ |
| |
| if (flags & (DCX_WINDOW | DCX_PARENTCLIP)) flags |= DCX_CACHE; |
| |
| if (flags & DCX_USESTYLE) |
| { |
| flags &= ~( DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP); |
| |
| if( wndPtr->dwStyle & WS_CLIPSIBLINGS ) |
| flags |= DCX_CLIPSIBLINGS; |
| |
| if ( !(flags & DCX_WINDOW) ) |
| { |
| if (wndPtr->clsStyle & CS_PARENTDC) flags |= DCX_PARENTCLIP; |
| |
| if (wndPtr->dwStyle & WS_CLIPCHILDREN && |
| !(wndPtr->dwStyle & WS_MINIMIZE) ) flags |= DCX_CLIPCHILDREN; |
| if (!wndPtr->dce) flags |= DCX_CACHE; |
| } |
| } |
| |
| if (flags & DCX_WINDOW) flags &= ~DCX_CLIPCHILDREN; |
| |
| parent = GetAncestor( hwnd, GA_PARENT ); |
| if (!parent || (parent == GetDesktopWindow())) |
| flags = (flags & ~DCX_PARENTCLIP) | DCX_CLIPSIBLINGS; |
| |
| /* it seems parent clip is ignored when clipping siblings or children */ |
| if (flags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN)) flags &= ~DCX_PARENTCLIP; |
| |
| if( flags & DCX_PARENTCLIP ) |
| { |
| LONG parent_style = GetWindowLongW( parent, GWL_STYLE ); |
| if( (wndPtr->dwStyle & WS_VISIBLE) && (parent_style & WS_VISIBLE) ) |
| { |
| flags &= ~DCX_CLIPCHILDREN; |
| if (parent_style & WS_CLIPSIBLINGS) flags |= DCX_CLIPSIBLINGS; |
| } |
| } |
| |
| /* find a suitable DCE */ |
| |
| dcxFlags = flags & (DCX_PARENTCLIP | DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | |
| DCX_CACHE | DCX_WINDOW); |
| |
| if (flags & DCX_CACHE) |
| { |
| DCE* dceEmpty; |
| DCE* dceUnused; |
| |
| dceEmpty = dceUnused = NULL; |
| |
| /* Strategy: First, we attempt to find a non-empty but unused DCE with |
| * compatible flags. Next, we look for an empty entry. If the cache is |
| * full we have to purge one of the unused entries. |
| */ |
| |
| for (dce = firstDCE; (dce); dce = dce->next) |
| { |
| if ((dce->DCXflags & (DCX_CACHE | DCX_DCEBUSY)) == DCX_CACHE ) |
| { |
| dceUnused = dce; |
| |
| if (dce->DCXflags & DCX_DCEEMPTY) |
| dceEmpty = dce; |
| else |
| if ((dce->hwndCurrent == hwnd) && |
| ((dce->DCXflags & (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | |
| DCX_CACHE | DCX_WINDOW | DCX_PARENTCLIP)) == dcxFlags)) |
| { |
| TRACE("\tfound valid %p dce [%p], flags %08lx\n", |
| dce, hwnd, dcxFlags ); |
| bUpdateVisRgn = FALSE; |
| bUpdateClipOrigin = TRUE; |
| break; |
| } |
| } |
| } |
| |
| if (!dce) dce = (dceEmpty) ? dceEmpty : dceUnused; |
| |
| /* if there's no dce empty or unused, allocate a new one */ |
| if (!dce) |
| { |
| dce = DCE_AllocDCE( 0, DCE_CACHE_DC ); |
| } |
| } |
| else |
| { |
| dce = wndPtr->dce; |
| if (dce && dce->hwndCurrent == hwnd) |
| { |
| TRACE("\tskipping hVisRgn update\n"); |
| bUpdateVisRgn = FALSE; /* updated automatically, via DCHook() */ |
| } |
| } |
| if (!dce) |
| { |
| hdc = 0; |
| goto END; |
| } |
| |
| if (!(flags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN))) hrgnClip = 0; |
| |
| if (((flags ^ dce->DCXflags) & (DCX_INTERSECTRGN | DCX_EXCLUDERGN)) && |
| (dce->hClipRgn != hrgnClip)) |
| { |
| /* if the extra clip region has changed, get rid of the old one */ |
| DCE_DeleteClipRgn( dce ); |
| } |
| |
| dce->hwndCurrent = hwnd; |
| dce->hClipRgn = hrgnClip; |
| dce->DCXflags = flags & (DCX_PARENTCLIP | DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | |
| DCX_CACHE | DCX_WINDOW | DCX_WINDOWPAINT | |
| DCX_KEEPCLIPRGN | DCX_INTERSECTRGN | DCX_EXCLUDERGN); |
| dce->DCXflags |= DCX_DCEBUSY; |
| dce->DCXflags &= ~DCX_DCEDIRTY; |
| hdc = dce->hDC; |
| |
| if (bUpdateVisRgn) SetHookFlags16( HDC_16(hdc), DCHF_INVALIDATEVISRGN ); /* force update */ |
| |
| if (!USER_Driver.pGetDC( hwnd, hdc, hrgnClip, flags )) hdc = 0; |
| |
| TRACE("(%p,%p,0x%lx): returning %p\n", hwnd, hrgnClip, flags, hdc); |
| END: |
| WIN_ReleasePtr(wndPtr); |
| return hdc; |
| } |
| |
| |
| /*********************************************************************** |
| * GetDC (USER32.@) |
| * RETURNS |
| * :Handle to DC |
| * NULL: Failure |
| */ |
| HDC WINAPI GetDC( |
| HWND hwnd /* [in] handle of window */ |
| ) { |
| if (!hwnd) |
| return GetDCEx( 0, 0, DCX_CACHE | DCX_WINDOW ); |
| return GetDCEx( hwnd, 0, DCX_USESTYLE ); |
| } |
| |
| |
| /*********************************************************************** |
| * GetWindowDC (USER32.@) |
| */ |
| HDC WINAPI GetWindowDC( HWND hwnd ) |
| { |
| return GetDCEx( hwnd, 0, DCX_USESTYLE | DCX_WINDOW ); |
| } |
| |
| |
| /*********************************************************************** |
| * ReleaseDC (USER32.@) |
| * |
| * RETURNS |
| * 1: Success |
| * 0: Failure |
| */ |
| INT WINAPI ReleaseDC( |
| HWND hwnd /* [in] Handle of window - ignored */, |
| HDC hdc /* [in] Handle of device context */ |
| ) { |
| DCE * dce; |
| INT nRet = 0; |
| |
| USER_Lock(); |
| dce = firstDCE; |
| |
| TRACE("%p %p\n", hwnd, hdc ); |
| |
| while (dce && (dce->hDC != hdc)) dce = dce->next; |
| |
| if ( dce ) |
| if ( dce->DCXflags & DCX_DCEBUSY ) |
| nRet = DCE_ReleaseDC( dce ); |
| |
| USER_Unlock(); |
| |
| return nRet; |
| } |
| |
| /*********************************************************************** |
| * DCHook (USER.362) |
| * |
| * See "Undoc. Windows" for hints (DC, SetDCHook, SetHookFlags).. |
| */ |
| BOOL16 WINAPI DCHook16( HDC16 hDC, WORD code, DWORD data, LPARAM lParam ) |
| { |
| BOOL retv = TRUE; |
| DCE *dce = (DCE *)data; |
| |
| TRACE("hDC = %04x, %i\n", hDC, code); |
| |
| if (!dce) return 0; |
| assert( HDC_16(dce->hDC) == hDC ); |
| |
| /* Grab the windows lock before doing anything else */ |
| USER_Lock(); |
| |
| switch( code ) |
| { |
| case DCHC_INVALIDVISRGN: |
| /* GDI code calls this when it detects that the |
| * DC is dirty (usually after SetHookFlags()). This |
| * means that we have to recompute the visible region. |
| */ |
| if( dce->DCXflags & DCX_DCEBUSY ) |
| { |
| /* Dirty bit has been cleared by caller, set it again so that |
| * pGetDC recomputes the visible region. */ |
| SetHookFlags16( hDC, DCHF_INVALIDATEVISRGN ); |
| USER_Driver.pGetDC( dce->hwndCurrent, dce->hDC, dce->hClipRgn, dce->DCXflags ); |
| } |
| else /* non-fatal but shouldn't happen */ |
| WARN("DC is not in use!\n"); |
| break; |
| |
| case DCHC_DELETEDC: |
| /* |
| * Windows will not let you delete a DC that is busy |
| * (between GetDC and ReleaseDC) |
| */ |
| |
| if ( dce->DCXflags & DCX_DCEBUSY ) |
| { |
| WARN("Application trying to delete a busy DC\n"); |
| retv = FALSE; |
| } |
| else DCE_FreeDCE( dce ); |
| break; |
| |
| default: |
| FIXME("unknown code\n"); |
| } |
| |
| USER_Unlock(); /* Release the wnd lock */ |
| return retv; |
| } |
| |
| |
| /********************************************************************** |
| * WindowFromDC (USER32.@) |
| */ |
| HWND WINAPI WindowFromDC( HDC hDC ) |
| { |
| DCE *dce; |
| HWND hwnd; |
| |
| USER_Lock(); |
| dce = firstDCE; |
| |
| while (dce && (dce->hDC != hDC)) dce = dce->next; |
| |
| hwnd = dce ? dce->hwndCurrent : 0; |
| USER_Unlock(); |
| |
| return hwnd; |
| } |
| |
| |
| /*********************************************************************** |
| * LockWindowUpdate (USER32.@) |
| */ |
| BOOL WINAPI LockWindowUpdate( HWND hwnd ) |
| { |
| static HWND lockedWnd; |
| |
| FIXME("(%p), partial stub!\n",hwnd); |
| |
| USER_Lock(); |
| if (lockedWnd) |
| { |
| if (!hwnd) |
| { |
| /* Unlock lockedWnd */ |
| /* FIXME: Do something */ |
| } |
| else |
| { |
| /* Attempted to lock a second window */ |
| /* Return FALSE and do nothing */ |
| USER_Unlock(); |
| return FALSE; |
| } |
| } |
| lockedWnd = hwnd; |
| USER_Unlock(); |
| return TRUE; |
| } |
