wine/dlls/x11drv/scroll.c
Ulrich Czekalla 06a60621ab ScrollDC should take into account overlapped windows. With this change
ScrollWindowEx can be moved out of X11drv.
2004-06-15 17:04:02 +00:00

132 lines
4.4 KiB
C

/*
* Scroll windows and DCs
*
* Copyright 1993 David W. Metcalfe
* Copyright 1995, 1996 Alex Korobka
* Copyright 2001 Alexandre Julliard
*
* 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
*/
#include "config.h"
#include <stdarg.h>
#include <X11/Xlib.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "x11drv.h"
#include "win.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(scroll);
/*************************************************************************
* ScrollDC (X11DRV.@)
*/
BOOL WINAPI X11DRV_ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
{
RECT rSrc, rClipped_src, rClip, rDst, offset;
INT code = X11DRV_START_EXPOSURES;
if (hrgnUpdate || lprcUpdate)
ExtEscape( hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code, 0, NULL );
/* compute device clipping region (in device coordinates) */
if (lprcScroll) rSrc = *lprcScroll;
else GetClipBox( hdc, &rSrc );
LPtoDP(hdc, (LPPOINT)&rSrc, 2);
if (lprcClip) rClip = *lprcClip;
else GetClipBox( hdc, &rClip );
LPtoDP(hdc, (LPPOINT)&rClip, 2);
IntersectRect( &rClipped_src, &rSrc, &rClip );
TRACE("rSrc %s rClip %s clipped rSrc %s\n", wine_dbgstr_rect(&rSrc),
wine_dbgstr_rect(&rClip), wine_dbgstr_rect(&rClipped_src));
rDst = rClipped_src;
SetRect(&offset, 0, 0, dx, dy);
LPtoDP(hdc, (LPPOINT)&offset, 2);
OffsetRect( &rDst, offset.right - offset.left, offset.bottom - offset.top );
TRACE("rDst before clipping %s\n", wine_dbgstr_rect(&rDst));
IntersectRect( &rDst, &rDst, &rClip );
TRACE("rDst after clipping %s\n", wine_dbgstr_rect(&rDst));
if (!IsRectEmpty(&rDst))
{
/* copy bits */
RECT rDst_lp = rDst, rSrc_lp = rDst;
OffsetRect( &rSrc_lp, offset.left - offset.right, offset.top - offset.bottom );
DPtoLP(hdc, (LPPOINT)&rDst_lp, 2);
DPtoLP(hdc, (LPPOINT)&rSrc_lp, 2);
if (!BitBlt( hdc, rDst_lp.left, rDst_lp.top,
rDst_lp.right - rDst_lp.left, rDst_lp.bottom - rDst_lp.top,
hdc, rSrc_lp.left, rSrc_lp.top, SRCCOPY))
return FALSE;
}
/* compute update areas. This is the clipped source or'ed with the unclipped source translated minus the
clipped src translated (rDst) all clipped to rClip */
if (hrgnUpdate || lprcUpdate)
{
HRGN hrgn = hrgnUpdate, hrgn2, hrgn3 = 0;
code = X11DRV_END_EXPOSURES;
ExtEscape( hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code, sizeof(hrgn3), (LPSTR)&hrgn3 );
if (hrgn) SetRectRgn( hrgn, rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
else hrgn = CreateRectRgn( rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
hrgn2 = CreateRectRgnIndirect( &rSrc );
OffsetRgn(hrgn2, offset.right - offset.left, offset.bottom - offset.top );
CombineRgn(hrgn, hrgn, hrgn2, RGN_OR);
SetRectRgn( hrgn2, rDst.left, rDst.top, rDst.right, rDst.bottom );
CombineRgn( hrgn, hrgn, hrgn2, RGN_DIFF );
SetRectRgn( hrgn2, rClip.left, rClip.top, rClip.right, rClip.bottom );
CombineRgn( hrgn, hrgn, hrgn2, RGN_AND );
if (hrgn3)
{
CombineRgn( hrgn, hrgn, hrgn3, RGN_OR );
DeleteObject( hrgn3 );
}
if( lprcUpdate )
{
GetRgnBox( hrgn, lprcUpdate );
/* Put the lprcUpdate in logical coordinate */
DPtoLP( hdc, (LPPOINT)lprcUpdate, 2 );
TRACE("returning lprcUpdate %s\n", wine_dbgstr_rect(lprcUpdate));
}
if (!hrgnUpdate) DeleteObject( hrgn );
DeleteObject( hrgn2 );
}
return TRUE;
}