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Don't retrieve a window DC in GetUpdateRect if there is nothing to 

erase, to avoid setting a null update region in an owned DC.
Avoid potential double delete of the update region on return from
send_erase.
This commit is contained in:
Alexandre Julliard 2005-05-05 16:52:21 +00:00
parent 759263042e
commit ac0bf21abc
1 changed files with 13 additions and 19 deletions
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32
dlls/user/painting.c
View File

@ -231,14 +231,14 @@ static HRGN send_ncpaint( HWND hwnd, HWND *child, UINT *flags )
* send_erase
*
* Send a WM_ERASEBKGND message if needed, and optionally return the DC for painting.
* If a DC is requested, the region is selected into it.
* If a DC is requested, the region is selected into it. In all cases the region is deleted.
* Helper for erase_now and BeginPaint.
*/
static BOOL send_erase( HWND hwnd, UINT flags, HRGN client_rgn,
RECT *clip_rect, HDC *hdc_ret )
{
BOOL need_erase = FALSE;
HDC hdc;
HDC hdc = 0;
RECT dummy;
if (!clip_rect) clip_rect = &dummy;
@ -267,6 +267,7 @@ static BOOL send_erase( HWND hwnd, UINT flags, HRGN client_rgn,
if (hdc_ret) *hdc_ret = hdc;
}
if (!hdc) DeleteObject( client_rgn );
return need_erase;
}
@ -291,7 +292,6 @@ static void erase_now( HWND hwnd, UINT rdw_flags )
if (!(hrgn = send_ncpaint( hwnd, &child, &flags ))) break;
send_erase( child, flags, hrgn, NULL, NULL );
DeleteObject( hrgn );
if (!flags) break; /* nothing more to do */
if (rdw_flags & RDW_NOCHILDREN) break;
@ -345,10 +345,8 @@ static void update_now( HWND hwnd, UINT rdw_flags )
TRACE( "%p not repainted properly, erasing\n", child );
if ((hrgn = send_ncpaint( child, NULL, &erase_flags )))
{
send_erase( child, erase_flags, hrgn, NULL, NULL );
DeleteObject( hrgn );
}
prev = 0;
}
else
@ -415,7 +413,6 @@ HDC WINAPI BeginPaint( HWND hwnd, PAINTSTRUCT *lps )
if (!(hrgn = send_ncpaint( hwnd, NULL, &flags ))) return 0;
lps->fErase = send_erase( hwnd, flags, hrgn, &lps->rcPaint, &lps->hdc );
if (!lps->hdc) DeleteObject( hrgn );
TRACE("hdc = %p box = (%ld,%ld - %ld,%ld), fErase = %d\n",
lps->hdc, lps->rcPaint.left, lps->rcPaint.top, lps->rcPaint.right, lps->rcPaint.bottom,
@ -657,13 +654,13 @@ INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
if ((update_rgn = send_ncpaint( hwnd, NULL, &flags )))
{
POINT offset;
retval = CombineRgn( hrgn, update_rgn, 0, RGN_COPY );
send_erase( hwnd, flags, update_rgn, NULL, NULL );
/* map region to client coordinates */
offset.x = offset.y = 0;
ScreenToClient( hwnd, &offset );
OffsetRgn( update_rgn, offset.x, offset.y );
retval = CombineRgn( hrgn, update_rgn, 0, RGN_COPY );
DeleteObject( update_rgn );
OffsetRgn( hrgn, offset.x, offset.y );
}
return retval;
}
@ -674,7 +671,6 @@ INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
*/
BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
{
HDC hdc;
UINT flags = UPDATE_NOCHILDREN;
HRGN update_rgn;
@ -685,16 +681,14 @@ BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
if (rect)
{
if (GetRgnBox( update_rgn, rect ) != NULLREGION)
{
HDC hdc = GetDCEx( hwnd, 0, DCX_USESTYLE );
MapWindowPoints( 0, hwnd, (LPPOINT)rect, 2 );
DPtoLP( hdc, (LPPOINT)rect, 2 );
ReleaseDC( hwnd, hdc );
}
}
send_erase( hwnd, flags, update_rgn, NULL, &hdc );
if (hdc)
{
if (rect) DPtoLP( hdc, (LPPOINT)rect, 2 );
ReleaseDC( hwnd, hdc );
}
else DeleteObject( update_rgn );
send_erase( hwnd, flags, update_rgn, NULL, NULL );
/* check if we still have an update region */
flags = UPDATE_PAINT | UPDATE_NOCHILDREN;