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https://github.com/reactos/wine.git
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193 lines
6.7 KiB
C
193 lines
6.7 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(scroll);
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static void dump_region( const char *p, HRGN hrgn)
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{
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DWORD i, size;
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RGNDATA *data = NULL;
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RECT *rect;
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if (!hrgn) {
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TRACE( "%s null region\n", p );
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return;
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}
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if (!(size = GetRegionData( hrgn, 0, NULL ))) {
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return;
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}
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if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return;
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GetRegionData( hrgn, size, data );
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TRACE("%s %d rects:", p, data->rdh.nCount );
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for (i = 0, rect = (RECT *)data->Buffer; i<20 && i < data->rdh.nCount; i++, rect++)
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TRACE( " %s", wine_dbgstr_rect( rect));
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TRACE("\n");
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HeapFree( GetProcessHeap(), 0, data );
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}
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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 rcSrc, rcClip, offset;
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INT dxdev, dydev, res;
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HRGN DstRgn, clipRgn, visrgn;
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INT code = X11DRV_START_EXPOSURES;
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TRACE("dx,dy %d,%d rcScroll %s rcClip %s hrgnUpdate %p lprcUpdate %p\n",
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dx, dy, wine_dbgstr_rect(lprcScroll), wine_dbgstr_rect(lprcClip),
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hrgnUpdate, lprcUpdate);
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/* enable X-exposure events */
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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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/* get the visible region */
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visrgn=CreateRectRgn( 0, 0, 0, 0);
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GetRandomRgn( hdc, visrgn, SYSRGN);
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if( !(GetVersion() & 0x80000000)) {
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/* Window NT/2k/XP */
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POINT org;
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GetDCOrgEx(hdc, &org);
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OffsetRgn( visrgn, -org.x, -org.y);
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}
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/* intersect with the clipping Region if the DC has one */
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clipRgn = CreateRectRgn( 0, 0, 0, 0);
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if (GetClipRgn( hdc, clipRgn) != 1) {
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DeleteObject(clipRgn);
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clipRgn=NULL;
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} else
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CombineRgn( visrgn, visrgn, clipRgn, RGN_AND);
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/* only those pixels in the scroll rectangle that remain in the clipping
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* rect are scrolled. */
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if( lprcClip)
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rcClip = *lprcClip;
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else
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GetClipBox( hdc, &rcClip);
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rcSrc = rcClip;
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OffsetRect( &rcClip, -dx, -dy);
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IntersectRect( &rcSrc, &rcSrc, &rcClip);
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/* if an scroll rectangle is specified, only the pixels within that
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* rectangle are scrolled */
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if( lprcScroll)
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IntersectRect( &rcSrc, &rcSrc, lprcScroll);
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/* now convert to device coordinates */
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LPtoDP(hdc, (LPPOINT)&rcSrc, 2);
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TRACE("source rect: %s\n", wine_dbgstr_rect(&rcSrc));
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/* also dx and dy */
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SetRect(&offset, 0, 0, dx, dy);
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LPtoDP(hdc, (LPPOINT)&offset, 2);
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dxdev = offset.right - offset.left;
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dydev = offset.bottom - offset.top;
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/* now intersect with the visible region to get the pixels that will
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* actually scroll */
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DstRgn = CreateRectRgnIndirect( &rcSrc);
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res = CombineRgn( DstRgn, DstRgn, visrgn, RGN_AND);
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/* and translate, giving the destination region */
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OffsetRgn( DstRgn, dxdev, dydev);
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if( TRACE_ON( scroll)) dump_region( "Destination scroll region: ", DstRgn);
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/* if there are any, do it */
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if( res > NULLREGION) {
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RECT rect ;
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/* clip to the destination region, so we can BitBlt with a simple
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* bounding rectangle */
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if( clipRgn)
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ExtSelectClipRgn( hdc, DstRgn, RGN_AND);
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else
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SelectClipRgn( hdc, DstRgn);
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GetRgnBox( DstRgn, &rect);
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DPtoLP(hdc, (LPPOINT)&rect, 2);
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TRACE("destination rect: %s\n", wine_dbgstr_rect(&rect));
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BitBlt( hdc, rect.left, rect.top,
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rect.right - rect.left, rect.bottom - rect.top,
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hdc, rect.left - dx, rect.top - dy, SRCCOPY);
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}
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/* compute the update areas. This is the combined clip rectangle
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* minus the scrolled region, and intersected with the visible
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* region. */
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if (hrgnUpdate || lprcUpdate)
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{
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HRGN hrgn = hrgnUpdate;
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HRGN ExpRgn = 0;
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/* collect all the exposures */
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code = X11DRV_END_EXPOSURES;
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ExtEscape( hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code,
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sizeof(ExpRgn), (LPSTR)&ExpRgn );
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/* Intersect clip and scroll rectangles, allowing NULL values */
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if( lprcScroll)
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if( lprcClip)
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IntersectRect( &rcClip, lprcClip, lprcScroll);
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else
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rcClip = *lprcScroll;
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else
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if( lprcClip)
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rcClip = *lprcClip;
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else
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GetClipBox( hdc, &rcClip);
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/* Convert the combined clip rectangle to device coordinates */
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LPtoDP(hdc, (LPPOINT)&rcClip, 2);
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if( hrgn )
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SetRectRgn( hrgn, rcClip.left, rcClip.top, rcClip.right,
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rcClip.bottom);
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else
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hrgn = CreateRectRgnIndirect( &rcClip);
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CombineRgn( hrgn, hrgn, visrgn, RGN_AND);
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CombineRgn( hrgn, hrgn, DstRgn, RGN_DIFF);
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/* add the exposures to this */
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if( ExpRgn) {
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if( TRACE_ON( scroll)) dump_region( "Expose region: ", ExpRgn);
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CombineRgn( hrgn, hrgn, ExpRgn, RGN_OR);
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DeleteObject( ExpRgn);
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}
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if( TRACE_ON( scroll)) dump_region( "Update region: ", hrgn);
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if( lprcUpdate) {
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GetRgnBox( hrgn, lprcUpdate );
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/* Put the lprcUpdate in logical coordinates */
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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)
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DeleteObject( hrgn);
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}
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/* restore original clipping region */
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SelectClipRgn( hdc, clipRgn);
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DeleteObject( visrgn);
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DeleteObject( DstRgn);
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if( clipRgn) DeleteObject( clipRgn);
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return TRUE;
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}
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