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132 lines
4.4 KiB
C
132 lines
4.4 KiB
C
/*
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* Scroll windows and DCs
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*
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* Copyright 1993 David W. Metcalfe
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* Copyright 1995, 1996 Alex Korobka
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* Copyright 2001 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <stdarg.h>
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#include <X11/Xlib.h>
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#include "windef.h"
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#include "winbase.h"
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#include "wingdi.h"
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#include "winuser.h"
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#include "x11drv.h"
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#include "win.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(scroll);
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/*************************************************************************
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* ScrollDC (X11DRV.@)
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*/
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BOOL X11DRV_ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
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const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
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{
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RECT rSrc, rClipped_src, rClip, rDst, offset;
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INT code = X11DRV_START_EXPOSURES;
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if (hrgnUpdate || lprcUpdate)
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ExtEscape( hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code, 0, NULL );
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/* compute device clipping region (in device coordinates) */
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if (lprcScroll) rSrc = *lprcScroll;
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else GetClipBox( hdc, &rSrc );
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LPtoDP(hdc, (LPPOINT)&rSrc, 2);
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if (lprcClip) rClip = *lprcClip;
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else GetClipBox( hdc, &rClip );
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LPtoDP(hdc, (LPPOINT)&rClip, 2);
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IntersectRect( &rClipped_src, &rSrc, &rClip );
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TRACE("rSrc %s rClip %s clipped rSrc %s\n", wine_dbgstr_rect(&rSrc),
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wine_dbgstr_rect(&rClip), wine_dbgstr_rect(&rClipped_src));
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rDst = rClipped_src;
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SetRect(&offset, 0, 0, dx, dy);
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LPtoDP(hdc, (LPPOINT)&offset, 2);
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OffsetRect( &rDst, offset.right - offset.left, offset.bottom - offset.top );
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TRACE("rDst before clipping %s\n", wine_dbgstr_rect(&rDst));
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IntersectRect( &rDst, &rDst, &rClip );
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TRACE("rDst after clipping %s\n", wine_dbgstr_rect(&rDst));
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if (!IsRectEmpty(&rDst))
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{
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/* copy bits */
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RECT rDst_lp = rDst, rSrc_lp = rDst;
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OffsetRect( &rSrc_lp, offset.left - offset.right, offset.top - offset.bottom );
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DPtoLP(hdc, (LPPOINT)&rDst_lp, 2);
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DPtoLP(hdc, (LPPOINT)&rSrc_lp, 2);
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if (!BitBlt( hdc, rDst_lp.left, rDst_lp.top,
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rDst_lp.right - rDst_lp.left, rDst_lp.bottom - rDst_lp.top,
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hdc, rSrc_lp.left, rSrc_lp.top, SRCCOPY))
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return FALSE;
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}
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/* compute update areas. This is the clipped source or'ed with the unclipped source translated minus the
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clipped src translated (rDst) all clipped to rClip */
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if (hrgnUpdate || lprcUpdate)
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{
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HRGN hrgn = hrgnUpdate, hrgn2, hrgn3 = 0;
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code = X11DRV_END_EXPOSURES;
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ExtEscape( hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code, sizeof(hrgn3), (LPSTR)&hrgn3 );
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if (hrgn) SetRectRgn( hrgn, rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
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else hrgn = CreateRectRgn( rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
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hrgn2 = CreateRectRgnIndirect( &rSrc );
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OffsetRgn(hrgn2, offset.right - offset.left, offset.bottom - offset.top );
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CombineRgn(hrgn, hrgn, hrgn2, RGN_OR);
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SetRectRgn( hrgn2, rDst.left, rDst.top, rDst.right, rDst.bottom );
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CombineRgn( hrgn, hrgn, hrgn2, RGN_DIFF );
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SetRectRgn( hrgn2, rClip.left, rClip.top, rClip.right, rClip.bottom );
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CombineRgn( hrgn, hrgn, hrgn2, RGN_AND );
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if (hrgn3)
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{
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CombineRgn( hrgn, hrgn, hrgn3, RGN_OR );
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DeleteObject( hrgn3 );
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}
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if( lprcUpdate )
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{
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GetRgnBox( hrgn, lprcUpdate );
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/* Put the lprcUpdate in logical coordinate */
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DPtoLP( hdc, (LPPOINT)lprcUpdate, 2 );
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TRACE("returning lprcUpdate %s\n", wine_dbgstr_rect(lprcUpdate));
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}
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if (!hrgnUpdate) DeleteObject( hrgn );
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DeleteObject( hrgn2 );
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}
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return TRUE;
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}
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