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