590 lines
16 KiB
C
590 lines
16 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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/* return the DC device rectangle if not empty */
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static inline BOOL get_dc_device_rect( DC *dc, RECT *rect )
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{
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*rect = dc->device_rect;
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offset_rect( rect, -dc->vis_rect.left, -dc->vis_rect.top );
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return !is_rect_empty( rect );
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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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lp_to_dp( dc, (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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* clip_device_rect
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*
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* Clip a rectangle to the whole DC surface.
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*/
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BOOL clip_device_rect( DC *dc, RECT *dst, const RECT *src )
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{
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RECT clip;
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if (get_dc_device_rect( dc, &clip )) return intersect_rect( dst, src, &clip );
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*dst = *src;
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return TRUE;
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}
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/***********************************************************************
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* clip_visrect
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*
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* Clip a rectangle to the DC visible rect.
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*/
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BOOL clip_visrect( DC *dc, RECT *dst, const RECT *src )
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{
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RECT clip;
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if (!clip_device_rect( dc, dst, src )) return FALSE;
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if (GetRgnBox( get_dc_region(dc), &clip )) return intersect_rect( dst, dst, &clip );
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return TRUE;
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}
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/***********************************************************************
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* update_dc_clipping
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*
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* Update the DC and device clip regions when the ClipRgn or VisRgn have changed.
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*/
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void update_dc_clipping( DC * dc )
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{
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PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSetDeviceClipping );
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HRGN regions[3];
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int count = 0;
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if (dc->hVisRgn) regions[count++] = dc->hVisRgn;
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if (dc->hClipRgn) regions[count++] = dc->hClipRgn;
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if (dc->hMetaRgn) regions[count++] = dc->hMetaRgn;
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if (count > 1)
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{
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if (!dc->region) dc->region = CreateRectRgn( 0, 0, 0, 0 );
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CombineRgn( dc->region, regions[0], regions[1], RGN_AND );
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if (count > 2) CombineRgn( dc->region, dc->region, regions[2], RGN_AND );
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}
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else /* only one region, we don't need the total region */
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{
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if (dc->region) DeleteObject( dc->region );
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dc->region = 0;
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}
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physdev->funcs->pSetDeviceClipping( physdev, get_dc_region( dc ));
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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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RECT rect;
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if (!get_dc_device_rect( dc, &rect ))
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{
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rect.left = 0;
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rect.top = 0;
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rect.right = GetDeviceCaps( dc->hSelf, DESKTOPHORZRES );
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rect.bottom = GetDeviceCaps( dc->hSelf, DESKTOPVERTRES );
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}
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dc->hClipRgn = CreateRectRgnIndirect( &rect );
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}
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/***********************************************************************
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* null driver fallback implementations
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*/
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INT nulldrv_ExtSelectClipRgn( PHYSDEV dev, HRGN rgn, INT mode )
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{
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DC *dc = get_nulldrv_dc( dev );
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INT ret;
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if (!rgn)
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{
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switch (mode)
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{
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case RGN_COPY:
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if (dc->hClipRgn) DeleteObject( dc->hClipRgn );
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dc->hClipRgn = 0;
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ret = SIMPLEREGION;
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break;
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case RGN_DIFF:
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return ERROR;
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default:
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FIXME("Unimplemented: hrgn NULL in mode: %d\n", mode);
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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 ))) return ERROR;
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mirror_region( mirrored, rgn, dc->vis_rect.right - dc->vis_rect.left );
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rgn = 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 (mode == RGN_COPY)
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ret = CombineRgn( dc->hClipRgn, rgn, 0, mode );
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else
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ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, mode);
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if (mirrored) DeleteObject( mirrored );
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}
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update_dc_clipping( dc );
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return ret;
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}
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INT nulldrv_ExcludeClipRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom )
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{
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DC *dc = get_nulldrv_dc( dev );
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RECT rect = get_clip_rect( dc, left, top, right, bottom );
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INT ret;
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HRGN rgn;
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if (!(rgn = CreateRectRgnIndirect( &rect ))) return ERROR;
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if (!dc->hClipRgn) create_default_clip_region( dc );
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ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, RGN_DIFF );
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DeleteObject( rgn );
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if (ret != ERROR) update_dc_clipping( dc );
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return ret;
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}
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INT nulldrv_IntersectClipRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom )
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{
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DC *dc = get_nulldrv_dc( dev );
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RECT rect = get_clip_rect( dc, left, top, right, bottom );
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INT ret;
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HRGN rgn;
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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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if (!(rgn = CreateRectRgnIndirect( &rect ))) return ERROR;
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ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, RGN_AND );
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DeleteObject( rgn );
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}
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if (ret != ERROR) update_dc_clipping( dc );
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return ret;
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}
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INT nulldrv_OffsetClipRgn( PHYSDEV dev, INT x, INT y )
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{
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DC *dc = get_nulldrv_dc( dev );
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INT ret = NULLREGION;
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if (dc->hClipRgn)
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{
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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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update_dc_clipping( dc );
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}
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return ret;
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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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PHYSDEV physdev;
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INT retval;
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DC * dc = get_dc_ptr( hdc );
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TRACE("%p %p %d\n", hdc, hrgn, fnMode );
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if (!dc) return ERROR;
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update_dc( dc );
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physdev = GET_DC_PHYSDEV( dc, pExtSelectClipRgn );
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retval = physdev->funcs->pExtSelectClipRgn( 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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/***********************************************************************
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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, const RECT *device_rect,
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struct window_surface *surface )
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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 %s %p\n", hdc, hrgn,
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wine_dbgstr_rect(vis_rect), wine_dbgstr_rect(device_rect), surface );
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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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if (dc->hVisRgn) DeleteObject( dc->hVisRgn );
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dc->dirty = 0;
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dc->vis_rect = *vis_rect;
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dc->device_rect = *device_rect;
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dc->hVisRgn = hrgn;
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dibdrv_set_window_surface( dc, surface );
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DC_UpdateXforms( dc );
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update_dc_clipping( 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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PHYSDEV physdev;
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INT ret;
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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 ERROR;
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update_dc( dc );
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physdev = GET_DC_PHYSDEV( dc, pOffsetClipRgn );
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ret = physdev->funcs->pOffsetClipRgn( physdev, x, 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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* 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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PHYSDEV physdev;
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INT ret;
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DC *dc = get_dc_ptr( hdc );
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TRACE("%p %d,%d-%d,%d\n", hdc, left, top, right, bottom );
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if (!dc) return ERROR;
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update_dc( dc );
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physdev = GET_DC_PHYSDEV( dc, pExcludeClipRect );
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ret = physdev->funcs->pExcludeClipRect( physdev, left, top, right, bottom );
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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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PHYSDEV physdev;
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INT ret;
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DC *dc = get_dc_ptr( hdc );
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TRACE("%p %d,%d - %d,%d\n", hdc, left, top, right, bottom );
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if (!dc) return ERROR;
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update_dc( dc );
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physdev = GET_DC_PHYSDEV( dc, pIntersectClipRect );
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ret = physdev->funcs->pIntersectClipRect( physdev, left, top, right, bottom );
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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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RECT visrect;
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BOOL ret;
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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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lp_to_dp( dc, &pt, 1 );
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update_dc( dc );
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ret = (!get_dc_device_rect( dc, &visrect ) ||
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(pt.x >= visrect.left && pt.x < visrect.right &&
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pt.y >= visrect.top && pt.y < visrect.bottom));
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if (ret && get_dc_region( dc )) ret = PtInRegion( get_dc_region( dc ), 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, visrect;
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BOOL ret;
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DC *dc = get_dc_ptr( hdc );
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if (!dc) return FALSE;
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TRACE("%p %s\n", hdc, wine_dbgstr_rect( rect ));
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tmpRect = *rect;
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lp_to_dp( dc, (POINT *)&tmpRect, 2 );
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order_rect( &tmpRect );
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update_dc( dc );
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ret = (!get_dc_device_rect( dc, &visrect ) || intersect_rect( &visrect, &visrect, &tmpRect ));
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if (ret && get_dc_region( dc )) ret = RectInRegion( get_dc_region( dc ), &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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RECT visrect;
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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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update_dc( dc );
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if (get_dc_region( dc ))
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{
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ret = GetRgnBox( get_dc_region( dc ), rect );
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}
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else
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{
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ret = is_rect_empty( &dc->vis_rect ) ? ERROR : SIMPLEREGION;
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*rect = dc->vis_rect;
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}
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if (get_dc_device_rect( dc, &visrect ) && !intersect_rect( rect, rect, &visrect )) ret = NULLREGION;
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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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DPtoLP( hdc, (LPPOINT)rect, 2 );
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release_dc_ptr( dc );
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TRACE("%p => %d %s\n", hdc, ret, wine_dbgstr_rect( rect ));
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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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INT ret = 1;
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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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if (dc->hClipRgn) CombineRgn( hRgn, dc->hClipRgn, 0, RGN_COPY );
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else ret = 0;
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break;
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case 2:
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if (dc->hMetaRgn) CombineRgn( hRgn, dc->hMetaRgn, 0, RGN_COPY );
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else ret = 0;
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break;
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case 3:
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if (dc->hClipRgn && dc->hMetaRgn) CombineRgn( hRgn, dc->hClipRgn, dc->hMetaRgn, RGN_AND );
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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;
|
|
}
|