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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);
/* return the DC device rectangle if not empty */
static inline BOOL get_dc_device_rect( DC *dc, RECT *rect )
{
*rect = dc->device_rect;
offset_rect( rect, -dc->vis_rect.left, -dc->vis_rect.top );
return !is_rect_empty( rect );
}
/***********************************************************************
* get_clip_rect
*
* Compute a clip rectangle from its logical coordinates.
*/
static inline RECT get_clip_rect( DC * dc, int left, int top, int right, int bottom )
{
RECT rect;
rect.left = left;
rect.top = top;
rect.right = right;
rect.bottom = bottom;
LPtoDP( dc->hSelf, (POINT *)&rect, 2 );
if (dc->layout & LAYOUT_RTL)
{
int tmp = rect.left;
rect.left = rect.right + 1;
rect.right = tmp + 1;
}
return rect;
}
/***********************************************************************
* clip_device_rect
*
* Clip a rectangle to the whole DC surface.
*/
BOOL clip_device_rect( DC *dc, RECT *dst, const RECT *src )
{
RECT clip;
if (get_dc_device_rect( dc, &clip )) return intersect_rect( dst, src, &clip );
*dst = *src;
return TRUE;
}
/***********************************************************************
* clip_visrect
*
* Clip a rectangle to the DC visible rect.
*/
BOOL clip_visrect( DC *dc, RECT *dst, const RECT *src )
{
RECT clip;
if (!clip_device_rect( dc, dst, src )) return FALSE;
if (GetRgnBox( get_dc_region(dc), &clip )) return intersect_rect( dst, dst, &clip );
return TRUE;
}
/***********************************************************************
* update_dc_clipping
*
* Update the DC and device clip regions when the ClipRgn or VisRgn have changed.
*/
void update_dc_clipping( DC * dc )
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSetDeviceClipping );
HRGN regions[3];
int count = 0;
if (dc->hVisRgn) regions[count++] = dc->hVisRgn;
if (dc->hClipRgn) regions[count++] = dc->hClipRgn;
if (dc->hMetaRgn) regions[count++] = dc->hMetaRgn;
if (count > 1)
{
if (!dc->region) dc->region = CreateRectRgn( 0, 0, 0, 0 );
CombineRgn( dc->region, regions[0], regions[1], RGN_AND );
if (count > 2) CombineRgn( dc->region, dc->region, regions[2], RGN_AND );
}
else /* only one region, we don't need the total region */
{
if (dc->region) DeleteObject( dc->region );
dc->region = 0;
}
physdev->funcs->pSetDeviceClipping( physdev, get_dc_region( dc ));
}
/***********************************************************************
* create_default_clip_region
*
* Create a default clipping region when none already exists.
*/
static inline void create_default_clip_region( DC * dc )
{
RECT rect;
if (!get_dc_device_rect( dc, &rect ))
{
rect.left = 0;
rect.top = 0;
rect.right = GetDeviceCaps( dc->hSelf, DESKTOPHORZRES );
rect.bottom = GetDeviceCaps( dc->hSelf, DESKTOPVERTRES );
}
dc->hClipRgn = CreateRectRgnIndirect( &rect );
}
/***********************************************************************
* null driver fallback implementations
*/
INT nulldrv_ExtSelectClipRgn( PHYSDEV dev, HRGN rgn, INT mode )
{
DC *dc = get_nulldrv_dc( dev );
INT ret;
if (!rgn)
{
if (mode != RGN_COPY)
{
FIXME("Unimplemented: hrgn NULL in mode: %d\n", mode);
return ERROR;
}
if (dc->hClipRgn) DeleteObject( dc->hClipRgn );
dc->hClipRgn = 0;
ret = SIMPLEREGION;
}
else
{
HRGN mirrored = 0;
if (dc->layout & LAYOUT_RTL)
{
if (!(mirrored = CreateRectRgn( 0, 0, 0, 0 ))) return ERROR;
mirror_region( mirrored, rgn, dc->vis_rect.right - dc->vis_rect.left );
rgn = mirrored;
}
if (!dc->hClipRgn)
create_default_clip_region( dc );
if (mode == RGN_COPY)
ret = CombineRgn( dc->hClipRgn, rgn, 0, mode );
else
ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, mode);
if (mirrored) DeleteObject( mirrored );
}
update_dc_clipping( dc );
return ret;
}
INT nulldrv_ExcludeClipRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom )
{
DC *dc = get_nulldrv_dc( dev );
RECT rect = get_clip_rect( dc, left, top, right, bottom );
INT ret;
HRGN rgn;
if (!(rgn = CreateRectRgnIndirect( &rect ))) return ERROR;
if (!dc->hClipRgn) create_default_clip_region( dc );
ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, RGN_DIFF );
DeleteObject( rgn );
if (ret != ERROR) update_dc_clipping( dc );
return ret;
}
INT nulldrv_IntersectClipRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom )
{
DC *dc = get_nulldrv_dc( dev );
RECT rect = get_clip_rect( dc, left, top, right, bottom );
INT ret;
HRGN rgn;
if (!dc->hClipRgn)
{
dc->hClipRgn = CreateRectRgnIndirect( &rect );
ret = SIMPLEREGION;
}
else
{
if (!(rgn = CreateRectRgnIndirect( &rect ))) return ERROR;
ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, RGN_AND );
DeleteObject( rgn );
}
if (ret != ERROR) update_dc_clipping( dc );
return ret;
}
INT nulldrv_OffsetClipRgn( PHYSDEV dev, INT x, INT y )
{
DC *dc = get_nulldrv_dc( dev );
INT ret = NULLREGION;
if (dc->hClipRgn)
{
x = MulDiv( x, dc->vportExtX, dc->wndExtX );
y = MulDiv( y, dc->vportExtY, dc->wndExtY );
if (dc->layout & LAYOUT_RTL) x = -x;
ret = OffsetRgn( dc->hClipRgn, x, y );
update_dc_clipping( dc );
}
return ret;
}
/***********************************************************************
* 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 = ERROR;
DC * dc = get_dc_ptr( hdc );
TRACE("%p %p %d\n", hdc, hrgn, fnMode );
if (dc)
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pExtSelectClipRgn );
update_dc( dc );
retval = physdev->funcs->pExtSelectClipRgn( physdev, hrgn, fnMode );
release_dc_ptr( dc );
}
return retval;
}
/***********************************************************************
* __wine_set_visible_region (GDI32.@)
*/
void CDECL __wine_set_visible_region( HDC hdc, HRGN hrgn, const RECT *vis_rect )
{
DC * dc;
if (!(dc = get_dc_ptr( hdc ))) return;
TRACE( "%p %p %s\n", hdc, hrgn, wine_dbgstr_rect(vis_rect) );
/* map region to DC coordinates */
OffsetRgn( hrgn, -vis_rect->left, -vis_rect->top );
if (dc->hVisRgn) DeleteObject( dc->hVisRgn );
dc->dirty = 0;
dc->vis_rect = *vis_rect;
dc->hVisRgn = hrgn;
DC_UpdateXforms( dc );
update_dc_clipping( dc );
release_dc_ptr( dc );
}
/***********************************************************************
* OffsetClipRgn (GDI32.@)
*/
INT WINAPI OffsetClipRgn( HDC hdc, INT x, INT y )
{
INT ret = ERROR;
DC *dc = get_dc_ptr( hdc );
TRACE("%p %d,%d\n", hdc, x, y );
if (dc)
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pOffsetClipRgn );
update_dc( dc );
ret = physdev->funcs->pOffsetClipRgn( physdev, x, y );
release_dc_ptr( dc );
}
return ret;
}
/***********************************************************************
* ExcludeClipRect (GDI32.@)
*/
INT WINAPI ExcludeClipRect( HDC hdc, INT left, INT top,
INT right, INT bottom )
{
INT ret = ERROR;
DC *dc = get_dc_ptr( hdc );
TRACE("%p %d,%d-%d,%d\n", hdc, left, top, right, bottom );
if (dc)
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pExcludeClipRect );
update_dc( dc );
ret = physdev->funcs->pExcludeClipRect( physdev, left, top, right, bottom );
release_dc_ptr( dc );
}
return ret;
}
/***********************************************************************
* IntersectClipRect (GDI32.@)
*/
INT WINAPI IntersectClipRect( HDC hdc, INT left, INT top, INT right, INT bottom )
{
INT ret = ERROR;
DC *dc = get_dc_ptr( hdc );
TRACE("%p %d,%d - %d,%d\n", hdc, left, top, right, bottom );
if (dc)
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pIntersectClipRect );
update_dc( dc );
ret = physdev->funcs->pIntersectClipRect( physdev, left, top, right, bottom );
release_dc_ptr( dc );
}
return ret;
}
/***********************************************************************
* PtVisible (GDI32.@)
*/
BOOL WINAPI PtVisible( HDC hdc, INT x, INT y )
{
POINT pt;
RECT visrect;
BOOL ret;
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 = (!get_dc_device_rect( dc, &visrect ) ||
(pt.x >= visrect.left && pt.x < visrect.right &&
pt.y >= visrect.top && pt.y < visrect.bottom));
if (ret && get_dc_region( dc )) ret = PtInRegion( get_dc_region( dc ), pt.x, pt.y );
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* RectVisible (GDI32.@)
*/
BOOL WINAPI RectVisible( HDC hdc, const RECT* rect )
{
RECT tmpRect, visrect;
BOOL ret;
DC *dc = get_dc_ptr( hdc );
if (!dc) return FALSE;
TRACE("%p %s\n", hdc, wine_dbgstr_rect( rect ));
tmpRect = *rect;
LPtoDP( hdc, (POINT *)&tmpRect, 2 );
update_dc( dc );
ret = (!get_dc_device_rect( dc, &visrect ) || intersect_rect( &visrect, &visrect, &tmpRect ));
if (ret && get_dc_region( dc )) ret = RectInRegion( get_dc_region( dc ), &tmpRect );
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* GetClipBox (GDI32.@)
*/
INT WINAPI GetClipBox( HDC hdc, LPRECT rect )
{
RECT visrect;
INT ret;
DC *dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
update_dc( dc );
if (get_dc_region( dc ))
{
ret = GetRgnBox( get_dc_region( dc ), rect );
if (get_dc_device_rect( dc, &visrect ) && !intersect_rect( rect, rect, &visrect ))
ret = NULLREGION;
}
else
{
ret = is_rect_empty( &dc->vis_rect ) ? ERROR : SIMPLEREGION;
*rect = dc->vis_rect;
}
if (dc->layout & LAYOUT_RTL)
{
int tmp = rect->left;
rect->left = rect->right - 1;
rect->right = tmp - 1;
}
DPtoLP( hdc, (LPPOINT)rect, 2 );
release_dc_ptr( dc );
TRACE("%p => %d %s\n", hdc, ret, wine_dbgstr_rect( rect ));
return ret;
}
/***********************************************************************
* GetClipRgn (GDI32.@)
*/
INT WINAPI GetClipRgn( HDC hdc, HRGN hRgn )
{
INT ret = -1;
DC * dc;
if ((dc = get_dc_ptr( hdc )))
{
if( dc->hClipRgn )
{
if( CombineRgn(hRgn, dc->hClipRgn, 0, RGN_COPY) != ERROR )
{
ret = 1;
if (dc->layout & LAYOUT_RTL)
mirror_region( hRgn, hRgn, dc->vis_rect.right - dc->vis_rect.left );
}
}
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;
if (dc->layout & LAYOUT_RTL)
mirror_region( hRgn, hRgn, dc->vis_rect.right - dc->vis_rect.left );
}
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)
{
INT ret = 1;
DC *dc = get_dc_ptr( hDC );
if (!dc) return -1;
switch (iCode)
{
case 1:
if (dc->hClipRgn) CombineRgn( hRgn, dc->hClipRgn, 0, RGN_COPY );
else ret = 0;
break;
case 2:
if (dc->hMetaRgn) CombineRgn( hRgn, dc->hMetaRgn, 0, RGN_COPY );
else ret = 0;
break;
case 3:
if (dc->hClipRgn && dc->hMetaRgn) CombineRgn( hRgn, dc->hClipRgn, dc->hMetaRgn, RGN_AND );
else if (dc->hClipRgn) CombineRgn( hRgn, dc->hClipRgn, 0, RGN_COPY );
else if (dc->hMetaRgn) CombineRgn( hRgn, dc->hMetaRgn, 0, RGN_COPY );
else ret = 0;
break;
case SYSRGN: /* == 4 */
update_dc( dc );
if (dc->hVisRgn)
{
CombineRgn( hRgn, dc->hVisRgn, 0, RGN_COPY );
/* On Windows NT/2000, the SYSRGN returned is in screen coordinates */
if (!(GetVersion() & 0x80000000)) OffsetRgn( hRgn, dc->vis_rect.left, dc->vis_rect.top );
}
else if (!is_rect_empty( &dc->device_rect ))
SetRectRgn( hRgn, dc->device_rect.left, dc->device_rect.top,
dc->device_rect.right, dc->device_rect.bottom );
else
ret = 0;
break;
default:
WARN("Unknown code %d\n", iCode);
ret = -1;
break;
}
release_dc_ptr( dc );
return ret;
}
/***********************************************************************
* SetMetaRgn (GDI32.@)
*/
INT WINAPI SetMetaRgn( HDC hdc )
{
INT ret;
RECT dummy;
DC *dc = get_dc_ptr( hdc );
if (!dc) return ERROR;
if (dc->hClipRgn)
{
if (dc->hMetaRgn)
{
/* the intersection becomes the new meta region */
CombineRgn( dc->hMetaRgn, dc->hMetaRgn, dc->hClipRgn, RGN_AND );
DeleteObject( dc->hClipRgn );
dc->hClipRgn = 0;
}
else
{
dc->hMetaRgn = dc->hClipRgn;
dc->hClipRgn = 0;
}
}
/* else nothing to do */
/* Note: no need to call update_dc_clipping, the overall clip region hasn't changed */
ret = GetRgnBox( dc->hMetaRgn, &dummy );
release_dc_ptr( dc );
return ret;
}
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