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wine/dlls/gdi32/clipping.c

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/*
* DC clipping functions
*
* Copyright 1993 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include <stdlib.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "gdi_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(clipping);
/***********************************************************************
* get_clip_region
*
* Return the total clip region (if any).
*/
static inline HRGN get_clip_region( DC * dc )
{
if (dc->hMetaClipRgn) return dc->hMetaClipRgn;
if (dc->hMetaRgn) return dc->hMetaRgn;
return dc->hClipRgn;
}
/***********************************************************************
* CLIPPING_UpdateGCRegion
*
* Update the GC clip region when the ClipRgn or VisRgn have changed.
*/
void CLIPPING_UpdateGCRegion( DC * dc )
{
HRGN clip_rgn;
/* update the intersection of meta and clip regions */
if (dc->hMetaRgn && dc->hClipRgn)
{
if (!dc->hMetaClipRgn) dc->hMetaClipRgn = CreateRectRgn( 0, 0, 0, 0 );
CombineRgn( dc->hMetaClipRgn, dc->hClipRgn, dc->hMetaRgn, RGN_AND );
clip_rgn = dc->hMetaClipRgn;
}
else /* only one is set, no need for an intersection */
{
if (dc->hMetaClipRgn) DeleteObject( dc->hMetaClipRgn );
dc->hMetaClipRgn = 0;
clip_rgn = dc->hMetaRgn ? dc->hMetaRgn : dc->hClipRgn;
}
if (dc->funcs->pSetDeviceClipping)
dc->funcs->pSetDeviceClipping( dc->physDev, dc->hVisRgn, clip_rgn );
}
/***********************************************************************
* create_default_clip_region
*
* Create a default clipping region when none already exists.
*/
static inline void create_default_clip_region( DC * dc )
{
UINT width, height;
if (dc->header.type == OBJ_MEMDC)
{
BITMAP bitmap;
GetObjectW( dc->hBitmap, sizeof(bitmap), &bitmap );
width = bitmap.bmWidth;
height = bitmap.bmHeight;
}
else
{
width = GetDeviceCaps( dc->hSelf, DESKTOPHORZRES );
height = GetDeviceCaps( dc->hSelf, DESKTOPVERTRES );
}
dc->hClipRgn = CreateRectRgn( 0, 0, width, height );
}
/***********************************************************************
* SelectClipRgn (GDI32.@)
*/
INT WINAPI SelectClipRgn( HDC hdc, HRGN hrgn )
{
return ExtSelectClipRgn( hdc, hrgn, RGN_COPY );
}
/******************************************************************************
* ExtSelectClipRgn [GDI32.@]
*/
INT WINAPI ExtSelectClipRgn( HDC hdc, HRGN hrgn, INT fnMode )
{
INT retval;
RECT rect;
DC * dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
TRACE("%p %p %d\n", hdc, hrgn, fnMode );
update_dc( dc );
if (dc->funcs->pExtSelectClipRgn)
{
retval = dc->funcs->pExtSelectClipRgn( dc->physDev, hrgn, fnMode );
release_dc_ptr( dc );
return retval;
}
if (!hrgn)
{
if (fnMode == RGN_COPY)
{
if (dc->hClipRgn) DeleteObject( dc->hClipRgn );
dc->hClipRgn = 0;
}
else
{
FIXME("Unimplemented: hrgn NULL in mode: %d\n", fnMode);
release_dc_ptr( dc );
return ERROR;
}
}
else
{
if (!dc->hClipRgn)
create_default_clip_region( dc );
if(fnMode == RGN_COPY)
CombineRgn( dc->hClipRgn, hrgn, 0, fnMode );
else
CombineRgn( dc->hClipRgn, dc->hClipRgn, hrgn, fnMode);
}
CLIPPING_UpdateGCRegion( dc );
release_dc_ptr( dc );
return GetClipBox(hdc, &rect);
}
/***********************************************************************
* SelectVisRgn (GDI32.@)
*
* Note: not exported on Windows, only the 16-bit version is exported.
*/
INT WINAPI SelectVisRgn( HDC hdc, HRGN hrgn )
{
int retval;
DC * dc;
if (!hrgn) return ERROR;
if (!(dc = get_dc_ptr( hdc ))) return ERROR;
TRACE("%p %p\n", hdc, hrgn );
dc->dirty = 0;
retval = CombineRgn( dc->hVisRgn, hrgn, 0, RGN_COPY );
CLIPPING_UpdateGCRegion( dc );
release_dc_ptr( dc );
return retval;
}
/***********************************************************************
* OffsetClipRgn (GDI32.@)
*/
INT WINAPI OffsetClipRgn( HDC hdc, INT x, INT y )
{
INT ret = SIMPLEREGION;
DC *dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
TRACE("%p %d,%d\n", hdc, x, y );
update_dc( dc );
if(dc->funcs->pOffsetClipRgn)
{
ret = dc->funcs->pOffsetClipRgn( dc->physDev, x, y );
/* FIXME: ret is just a success flag, we should return a proper value */
}
else if (dc->hClipRgn) {
ret = OffsetRgn( dc->hClipRgn, MulDiv( x, dc->vportExtX, dc->wndExtX ),
MulDiv( y, dc->vportExtY, dc->wndExtY ) );
CLIPPING_UpdateGCRegion( dc );
}
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* ExcludeClipRect (GDI32.@)
*/
INT WINAPI ExcludeClipRect( HDC hdc, INT left, INT top,
INT right, INT bottom )
{
HRGN newRgn;
INT ret;
DC *dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
TRACE("%p %dx%d,%dx%d\n", hdc, left, top, right, bottom );
update_dc( dc );
if(dc->funcs->pExcludeClipRect)
{
ret = dc->funcs->pExcludeClipRect( dc->physDev, left, top, right, bottom );
/* FIXME: ret is just a success flag, we should return a proper value */
}
else
{
POINT pt[2];
pt[0].x = left;
pt[0].y = top;
pt[1].x = right;
pt[1].y = bottom;
LPtoDP( hdc, pt, 2 );
if (!(newRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y ))) ret = ERROR;
else
{
if (!dc->hClipRgn)
create_default_clip_region( dc );
ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, newRgn, RGN_DIFF );
DeleteObject( newRgn );
}
if (ret != ERROR) CLIPPING_UpdateGCRegion( dc );
}
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* IntersectClipRect (GDI32.@)
*/
INT WINAPI IntersectClipRect( HDC hdc, INT left, INT top, INT right, INT bottom )
{
INT ret;
DC *dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
TRACE("%p %d,%d - %d,%d\n", hdc, left, top, right, bottom );
update_dc( dc );
if(dc->funcs->pIntersectClipRect)
{
ret = dc->funcs->pIntersectClipRect( dc->physDev, left, top, right, bottom );
/* FIXME: ret is just a success flag, we should return a proper value */
}
else
{
POINT pt[2];
pt[0].x = left;
pt[0].y = top;
pt[1].x = right;
pt[1].y = bottom;
LPtoDP( hdc, pt, 2 );
if (!dc->hClipRgn)
{
dc->hClipRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y );
ret = SIMPLEREGION;
}
else
{
HRGN newRgn;
if (!(newRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y ))) ret = ERROR;
else
{
ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, newRgn, RGN_AND );
DeleteObject( newRgn );
}
}
if (ret != ERROR) CLIPPING_UpdateGCRegion( dc );
}
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* PtVisible (GDI32.@)
*/
BOOL WINAPI PtVisible( HDC hdc, INT x, INT y )
{
POINT pt;
BOOL ret;
HRGN clip;
DC *dc = get_dc_ptr( hdc );
TRACE("%p %d,%d\n", hdc, x, y );
if (!dc) return FALSE;
pt.x = x;
pt.y = y;
LPtoDP( hdc, &pt, 1 );
update_dc( dc );
ret = PtInRegion( dc->hVisRgn, pt.x, pt.y );
if (ret && (clip = get_clip_region(dc))) ret = PtInRegion( clip, pt.x, pt.y );
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* RectVisible (GDI32.@)
*/
BOOL WINAPI RectVisible( HDC hdc, const RECT* rect )
{
RECT tmpRect;
BOOL ret;
HRGN clip;
DC *dc = get_dc_ptr( hdc );
if (!dc) return FALSE;
TRACE("%p %d,%dx%d,%d\n", hdc, rect->left, rect->top, rect->right, rect->bottom );
tmpRect = *rect;
LPtoDP( hdc, (POINT *)&tmpRect, 2 );
update_dc( dc );
if ((clip = get_clip_region(dc)))
{
HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
CombineRgn( hrgn, dc->hVisRgn, clip, RGN_AND );
ret = RectInRegion( hrgn, &tmpRect );
DeleteObject( hrgn );
}
else ret = RectInRegion( dc->hVisRgn, &tmpRect );
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* GetClipBox (GDI32.@)
*/
INT WINAPI GetClipBox( HDC hdc, LPRECT rect )
{
INT ret;
HRGN clip;
DC *dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
update_dc( dc );
if ((clip = get_clip_region(dc)))
{
HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
CombineRgn( hrgn, dc->hVisRgn, clip, RGN_AND );
ret = GetRgnBox( hrgn, rect );
DeleteObject( hrgn );
}
else ret = GetRgnBox( dc->hVisRgn, rect );
DPtoLP( hdc, (LPPOINT)rect, 2 );
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* GetClipRgn (GDI32.@)
*/
INT WINAPI GetClipRgn( HDC hdc, HRGN hRgn )
{
INT ret = -1;
DC * dc;
if (hRgn && (dc = get_dc_ptr( hdc )))
{
if( dc->hClipRgn )
{
if( CombineRgn(hRgn, dc->hClipRgn, 0, RGN_COPY) != ERROR ) ret = 1;
}
else ret = 0;
release_dc_ptr( dc );
}
return ret;
}
/***********************************************************************
* GetMetaRgn (GDI32.@)
*/
INT WINAPI GetMetaRgn( HDC hdc, HRGN hRgn )
{
INT ret = 0;
DC * dc = get_dc_ptr( hdc );
if (dc)
{
if (dc->hMetaRgn && CombineRgn( hRgn, dc->hMetaRgn, 0, RGN_COPY ) != ERROR)
ret = 1;
release_dc_ptr( dc );
}
return ret;
}
/***********************************************************************
* GetRandomRgn [GDI32.@]
*
* NOTES
* This function is documented in MSDN online for the case of
* iCode == SYSRGN (4).
*
* For iCode == 1 it should return the clip region
* 2 " " " the meta region
* 3 " " " the intersection of the clip with
* the meta region (== 'Rao' region).
*
* See http://www.codeproject.com/gdi/cliprgnguide.asp
*/
INT WINAPI GetRandomRgn(HDC hDC, HRGN hRgn, INT iCode)
{
HRGN rgn;
DC *dc = get_dc_ptr( hDC );
if (!dc) return -1;
switch (iCode)
{
case 1:
rgn = dc->hClipRgn;
break;
case 2:
rgn = dc->hMetaRgn;
break;
case 3:
rgn = dc->hMetaClipRgn;
if(!rgn) rgn = dc->hClipRgn;
if(!rgn) rgn = dc->hMetaRgn;
break;
case SYSRGN: /* == 4 */
update_dc( dc );
rgn = dc->hVisRgn;
break;
default:
WARN("Unknown code %d\n", iCode);
release_dc_ptr( dc );
return -1;
}
if (rgn) CombineRgn( hRgn, rgn, 0, RGN_COPY );
release_dc_ptr( dc );
/* On Windows NT/2000, the SYSRGN returned is in screen coordinates */
if (iCode == SYSRGN && !(GetVersion() & 0x80000000))
{
POINT org;
GetDCOrgEx( hDC, &org );
OffsetRgn( hRgn, org.x, org.y );
}
return (rgn != 0);
}
/***********************************************************************
* SetMetaRgn (GDI32.@)
*/
INT WINAPI SetMetaRgn( HDC hdc )
{
INT ret;
RECT dummy;
DC *dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
if (dc->hMetaClipRgn)
{
/* the intersection becomes the new meta region */
DeleteObject( dc->hMetaRgn );
DeleteObject( dc->hClipRgn );
dc->hMetaRgn = dc->hMetaClipRgn;
dc->hClipRgn = 0;
dc->hMetaClipRgn = 0;
}
else if (dc->hClipRgn)
{
dc->hMetaRgn = dc->hClipRgn;
dc->hClipRgn = 0;
}
/* else nothing to do */
/* Note: no need to call CLIPPING_UpdateGCRegion, the overall clip region hasn't changed */
ret = GetRgnBox( dc->hMetaRgn, &dummy );
release_dc_ptr( dc );
return ret;
}
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