wine/dlls/x11drv/scroll.c
2005-12-19 09:53:04 +01:00

193 lines
6.7 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 "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(scroll);
static void dump_region( const char *p, HRGN hrgn)
{
DWORD i, size;
RGNDATA *data = NULL;
RECT *rect;
if (!hrgn) {
TRACE( "%s null region\n", p );
return;
}
if (!(size = GetRegionData( hrgn, 0, NULL ))) {
return;
}
if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return;
GetRegionData( hrgn, size, data );
TRACE("%s %ld rects:", p, data->rdh.nCount );
for (i = 0, rect = (RECT *)data->Buffer; i<20 && i < data->rdh.nCount; i++, rect++)
TRACE( " %s", wine_dbgstr_rect( rect));
TRACE("\n");
HeapFree( GetProcessHeap(), 0, data );
}
/*************************************************************************
* ScrollDC (X11DRV.@)
*/
BOOL X11DRV_ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
{
RECT rcSrc, rcClip, offset;
INT dxdev, dydev, res;
HRGN DstRgn, clipRgn, visrgn;
INT code = X11DRV_START_EXPOSURES;
TRACE("dx,dy %d,%d rcScroll %s rcClip %s hrgnUpdate %p lprcUpdate %p\n",
dx, dy, wine_dbgstr_rect(lprcScroll), wine_dbgstr_rect(lprcClip),
hrgnUpdate, lprcUpdate);
/* enable X-exposure events */
if (hrgnUpdate || lprcUpdate)
ExtEscape( hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code, 0, NULL );
/* get the visible region */
visrgn=CreateRectRgn( 0, 0, 0, 0);
GetRandomRgn( hdc, visrgn, SYSRGN);
if( !(GetVersion() & 0x80000000)) {
/* Window NT/2k/XP */
POINT org;
GetDCOrgEx(hdc, &org);
OffsetRgn( visrgn, -org.x, -org.y);
}
/* intersect with the clipping Region if the DC has one */
clipRgn = CreateRectRgn( 0, 0, 0, 0);
if (GetClipRgn( hdc, clipRgn) != 1) {
DeleteObject(clipRgn);
clipRgn=NULL;
} else
CombineRgn( visrgn, visrgn, clipRgn, RGN_AND);
/* only those pixels in the scroll rectangle that remain in the clipping
* rect are scrolled. */
if( lprcClip)
rcClip = *lprcClip;
else
GetClipBox( hdc, &rcClip);
rcSrc = rcClip;
OffsetRect( &rcClip, -dx, -dy);
IntersectRect( &rcSrc, &rcSrc, &rcClip);
/* if an scroll rectangle is specified, only the pixels within that
* rectangle are scrolled */
if( lprcScroll)
IntersectRect( &rcSrc, &rcSrc, lprcScroll);
/* now convert to device coordinates */
LPtoDP(hdc, (LPPOINT)&rcSrc, 2);
TRACE("source rect: %s\n", wine_dbgstr_rect(&rcSrc));
/* also dx and dy */
SetRect(&offset, 0, 0, dx, dy);
LPtoDP(hdc, (LPPOINT)&offset, 2);
dxdev = offset.right - offset.left;
dydev = offset.bottom - offset.top;
/* now intersect with the visible region to get the pixels that will
* actually scroll */
DstRgn = CreateRectRgnIndirect( &rcSrc);
res = CombineRgn( DstRgn, DstRgn, visrgn, RGN_AND);
/* and translate, giving the destination region */
OffsetRgn( DstRgn, dxdev, dydev);
if( TRACE_ON( scroll)) dump_region( "Destination scroll region: ", DstRgn);
/* if there are any, do it */
if( res > NULLREGION) {
RECT rect ;
/* clip to the destination region, so we can BitBlt with a simple
* bounding rectangle */
if( clipRgn)
ExtSelectClipRgn( hdc, DstRgn, RGN_AND);
else
SelectClipRgn( hdc, DstRgn);
GetRgnBox( DstRgn, &rect);
DPtoLP(hdc, (LPPOINT)&rect, 2);
TRACE("destination rect: %s\n", wine_dbgstr_rect(&rect));
BitBlt( hdc, rect.left, rect.top,
rect.right - rect.left, rect.bottom - rect.top,
hdc, rect.left - dx, rect.top - dy, SRCCOPY);
}
/* compute the update areas. This is the combined clip rectangle
* minus the scrolled region, and intersected with the visible
* region. */
if (hrgnUpdate || lprcUpdate)
{
HRGN hrgn = hrgnUpdate;
HRGN ExpRgn = 0;
/* collect all the exposures */
code = X11DRV_END_EXPOSURES;
ExtEscape( hdc, X11DRV_ESCAPE, sizeof(code), (LPSTR)&code,
sizeof(ExpRgn), (LPSTR)&ExpRgn );
/* Intersect clip and scroll rectangles, allowing NULL values */
if( lprcScroll)
if( lprcClip)
IntersectRect( &rcClip, lprcClip, lprcScroll);
else
rcClip = *lprcScroll;
else
if( lprcClip)
rcClip = *lprcClip;
else
GetClipBox( hdc, &rcClip);
/* Convert the combined clip rectangle to device coordinates */
LPtoDP(hdc, (LPPOINT)&rcClip, 2);
if( hrgn )
SetRectRgn( hrgn, rcClip.left, rcClip.top, rcClip.right,
rcClip.bottom);
else
hrgn = CreateRectRgnIndirect( &rcClip);
CombineRgn( hrgn, hrgn, visrgn, RGN_AND);
CombineRgn( hrgn, hrgn, DstRgn, RGN_DIFF);
/* add the exposures to this */
if( ExpRgn) {
if( TRACE_ON( scroll)) dump_region( "Expose region: ", ExpRgn);
CombineRgn( hrgn, hrgn, ExpRgn, RGN_OR);
DeleteObject( ExpRgn);
}
if( TRACE_ON( scroll)) dump_region( "Update region: ", hrgn);
if( lprcUpdate) {
GetRgnBox( hrgn, lprcUpdate );
/* Put the lprcUpdate in logical coordinates */
DPtoLP( hdc, (LPPOINT)lprcUpdate, 2 );
TRACE("returning lprcUpdate %s\n", wine_dbgstr_rect(lprcUpdate));
}
if( !hrgnUpdate)
DeleteObject( hrgn);
}
/* restore original clipping region */
SelectClipRgn( hdc, clipRgn);
DeleteObject( visrgn);
DeleteObject( DstRgn);
if( clipRgn) DeleteObject( clipRgn);
return TRUE;
}