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/*
* 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_WINDOWPAINT - BeginPaint() is in effect
*/
#include <assert.h>
#include "dce.h"
#include "win.h"
#include "user_private.h"
#include "windef.h"
#include "wingdi.h"
#include "wownt32.h"
#include "wine/winbase16.h"
#include "wine/winuser16.h"
#include "wine/debug.h"
#include "wine/list.h"
WINE_DEFAULT_DEBUG_CHANNEL(dc);
typedef struct tagDCE
{
struct list entry;
HDC hDC;
HWND hwndCurrent;
HRGN hClipRgn;
DCE_TYPE type;
DWORD DCXflags;
} DCE;
static struct list dce_list = LIST_INIT(dce_list);
static void DCE_DeleteClipRgn( DCE* );
static INT DCE_ReleaseDC( DCE* );
/***********************************************************************
* DCE_DumpCache
*/
static void DCE_DumpCache(void)
{
DCE *dce;
USER_Lock();
LIST_FOR_EACH_ENTRY( dce, &dce_list, DCE, entry )
{
TRACE("\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" : "" );
}
USER_Unlock();
}
/***********************************************************************
* DCE_AllocDCE
*
* Allocate a new DCE.
*/
DCE *DCE_AllocDCE( HWND hWnd, DCE_TYPE type )
{
static const WCHAR szDisplayW[] = { 'D','I','S','P','L','A','Y','\0' };
DCE * dce;
TRACE("(%p,%d)\n", hWnd, type);
if (!(dce = HeapAlloc( GetProcessHeap(), 0, sizeof(DCE) ))) return NULL;
if (!(dce->hDC = CreateDCW( szDisplayW, NULL, NULL, NULL )))
{
HeapFree( GetProcessHeap(), 0, dce );
return 0;
}
SaveDC( dce->hDC );
/* store DCE handle in DC hook data field */
SetDCHook( dce->hDC, DCHook16, (DWORD)dce );
dce->hwndCurrent = hWnd;
dce->hClipRgn = 0;
dce->type = type;
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();
list_add_head( &dce_list, &dce->entry );
USER_Unlock();
return dce;
}
/***********************************************************************
* DCE_FreeDCE
*/
void DCE_FreeDCE( DCE *dce )
{
if (!dce) return;
USER_Lock();
list_remove( &dce->entry );
USER_Unlock();
SetDCHook(dce->hDC, NULL, 0L);
DeleteDC( dce->hDC );
if (dce->hClipRgn) DeleteObject(dce->hClipRgn);
HeapFree( GetProcessHeap(), 0, dce );
}
/***********************************************************************
* DCE_FreeWindowDCE
*
* Remove owned DCE and reset unreleased cache DCEs.
*/
void DCE_FreeWindowDCE( HWND hwnd )
{
struct list *ptr, *next;
WND *pWnd = WIN_GetPtr( hwnd );
LIST_FOR_EACH_SAFE( ptr, next, &dce_list )
{
DCE *pDCE = LIST_ENTRY( ptr, DCE, entry );
if (pDCE->hwndCurrent != hwnd) continue;
switch( pDCE->type )
{
case DCE_WINDOW_DC:
DCE_FreeDCE( pDCE );
pWnd->dce = NULL;
break;
case DCE_CLASS_DC:
if( pDCE->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN) )
{
if (USER_Driver.pReleaseDC)
USER_Driver.pReleaseDC( pDCE->hwndCurrent, pDCE->hDC );
DCE_DeleteClipRgn( pDCE );
pDCE->hwndCurrent = 0;
}
break;
case DCE_CACHE_DC:
if( pDCE->DCXflags & DCX_DCEBUSY ) /* shared cache DCE */
{
WARN("[%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;
break;
}
}
WIN_ReleasePtr( pWnd );
}
/***********************************************************************
* DCE_DeleteClipRgn
*/
static void DCE_DeleteClipRgn( DCE* dce )
{
dce->DCXflags &= ~(DCX_EXCLUDERGN | DCX_INTERSECTRGN | DCX_WINDOWPAINT);
if (dce->hClipRgn) 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 RestoreDC doesn't try to update the vis rgn */
SetHookFlags16( HDC_16(dce->hDC), DCHF_VALIDATEVISRGN );
RestoreDC( dce->hDC, 1 ); /* initial save level is always 1 */
SaveDC( dce->hDC ); /* save the state again for next time */
dce->DCXflags &= ~DCX_DCEBUSY;
if (dce->DCXflags & DCX_DCEDIRTY)
{
/* don't keep around invalidated entries
* because RestoreDC() 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, (%ld,%ld - %ld,%ld)\n",
hwndScope, pRectUpdate->left,pRectUpdate->top,
pRectUpdate->right,pRectUpdate->bottom);
if(TRACE_ON(dc))
DCE_DumpCache();
/* walk all DCEs and fixup non-empty entries */
LIST_FOR_EACH_ENTRY( dce, &dce_list, DCE, entry )
{
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;
}
/***********************************************************************
* 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;
LONG window_style;
TRACE("hwnd %p, hrgnClip %p, flags %08lx\n", hwnd, hrgnClip, flags);
if (flags & (DCX_LOCKWINDOWUPDATE)) {
FIXME("not yet supported - see source\n");
/* See the comment in LockWindowUpdate for more explanation. This flag is not implemented
* by that patch, but we need LockWindowUpdate implemented correctly before this can be done.
*/
}
if (!hwnd) hwnd = GetDesktopWindow();
else hwnd = WIN_GetFullHandle( hwnd );
if (!(wndPtr = WIN_GetPtr( hwnd ))) return 0;
if (wndPtr == WND_OTHER_PROCESS)
{
wndPtr = NULL;
USER_Lock();
}
window_style = GetWindowLongW( hwnd, GWL_STYLE );
/* fixup flags */
if (flags & (DCX_WINDOW | DCX_PARENTCLIP)) flags |= DCX_CACHE;
if (flags & DCX_USESTYLE)
{
flags &= ~( DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS | DCX_PARENTCLIP);
if( window_style & WS_CLIPSIBLINGS )
flags |= DCX_CLIPSIBLINGS;
if ( !(flags & DCX_WINDOW) )
{
if (GetClassLongW( hwnd, GCL_STYLE ) & CS_PARENTDC) flags |= DCX_PARENTCLIP;
if (window_style & WS_CLIPCHILDREN && !(window_style & WS_MINIMIZE))
flags |= DCX_CLIPCHILDREN;
if (!wndPtr || !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( (window_style & 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 = NULL, *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.
*/
LIST_FOR_EACH_ENTRY( dce, &dce_list, DCE, entry )
{
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->entry == &dce_list) /* nothing found */
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_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 || !USER_Driver.pGetDC( hwnd, hdc, hrgnClip, flags ))
hdc = 0;
TRACE("(%p,%p,0x%lx): returning %p\n", hwnd, hrgnClip, flags, hdc);
END:
if (wndPtr) WIN_ReleasePtr(wndPtr);
else USER_Unlock();
return hdc;
}
/***********************************************************************
* GetDC (USER32.@)
*
* Get a device context.
*
* RETURNS
* Success: Handle to the device context
* Failure: NULL.
*/
HDC WINAPI GetDC( HWND hwnd )
{
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.@)
*
* Release a device context.
*
* RETURNS
* Success: Non-zero. Resources used by hdc are released.
* Failure: 0.
*/
INT WINAPI ReleaseDC( HWND hwnd, HDC hdc )
{
DCE * dce;
INT nRet = 0;
TRACE("%p %p\n", hwnd, hdc );
USER_Lock();
LIST_FOR_EACH_ENTRY( dce, &dce_list, DCE, entry )
{
if (dce->hDC == hdc)
{
if ( dce->DCXflags & DCX_DCEBUSY )
nRet = DCE_ReleaseDC( dce );
break;
}
}
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 );
if (USER_Driver.pGetDC)
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 = 0;
USER_Lock();
LIST_FOR_EACH_ENTRY( dce, &dce_list, DCE, entry )
{
if (dce->hDC == hDC)
{
hwnd = dce->hwndCurrent;
break;
}
}
USER_Unlock();
return hwnd;
}
/***********************************************************************
* LockWindowUpdate (USER32.@)
*/
BOOL WINAPI LockWindowUpdate( HWND hwnd )
{
static HWND lockedWnd;
/* This function is fully implemented by the following patch:
*
* http://www.winehq.org/hypermail/wine-patches/2004/01/0142.html
*
* but in order to work properly, it needs the ability to invalidate
* DCEs in other processes when the lock window is changed, which
* isn't possible yet.
* -mike
*/
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;
}
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