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In RDW_UpdateRgn(), if hRgn is zero, clear the windows update region

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if it is an empty region.
This commit is contained in:
Rein Klazes 2004-01-21 02:18:51 +00:00 committed by Alexandre Julliard
parent d83ed49148
commit 15a4fef9a3
1 changed files with 16 additions and 2 deletions
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18
windows/painting.c
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@ -459,7 +459,21 @@ static void RDW_UpdateRgns( WND* wndPtr, HRGN hRgn, UINT flags, BOOL firstRecurs
wndPtr->hrgnUpdate = (HRGN)1; wndPtr->hrgnUpdate = (HRGN)1;
} }
else else
hRgn = wndPtr->hrgnUpdate; /* this is a trick that depends on code in PAINT_RedrawWindow() */ {
/* hRgn is zero */
if( wndPtr->hrgnUpdate > (HRGN)1)
{
GetRgnBox( wndPtr->hrgnUpdate, &r );
if( IsRectEmpty( &r ) )
{
DeleteObject( wndPtr->hrgnUpdate );
wndPtr->hrgnUpdate = 0;
goto end;
}
}
hRgn = wndPtr->hrgnUpdate; /* this is a trick that depends
* on code in RDW_Paint() */
}
if( !bHadOne && !(wndPtr->flags & WIN_INTERNAL_PAINT) ) if( !bHadOne && !(wndPtr->flags & WIN_INTERNAL_PAINT) )
add_paint_count( wndPtr->hwndSelf, 1 ); add_paint_count( wndPtr->hwndSelf, 1 );
@ -665,7 +679,7 @@ static HRGN RDW_Paint( WND* wndPtr, HRGN hrgn, UINT flags, UINT ex )
{ {
if (SendMessageW( hWnd, (bIcon) ? WM_ICONERASEBKGND : WM_ERASEBKGND, if (SendMessageW( hWnd, (bIcon) ? WM_ICONERASEBKGND : WM_ERASEBKGND,
(WPARAM)hDC, 0 )) (WPARAM)hDC, 0 ))
wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND; wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
ReleaseDC( hWnd, hDC ); ReleaseDC( hWnd, hDC );
} }
} }