2 * DC clipping functions
4 * Copyright 1993 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
26 #include "gdi_private.h"
27 #include "wine/debug.h"
29 WINE_DEFAULT_DEBUG_CHANNEL(clipping);
32 /* return the DC visible rectangle if not empty */
33 static inline BOOL get_dc_visrect( DC *dc, RECT *rect )
35 if (dc->header.type != OBJ_MEMDC) return FALSE;
38 rect->right = dc->vis_rect.right - dc->vis_rect.left;
39 rect->bottom = dc->vis_rect.bottom - dc->vis_rect.top;
43 /***********************************************************************
46 * Compute a clip rectangle from its logical coordinates.
48 static inline RECT get_clip_rect( DC * dc, int left, int top, int right, int bottom )
56 LPtoDP( dc->hSelf, (POINT *)&rect, 2 );
57 if (dc->layout & LAYOUT_RTL)
60 rect.left = rect.right + 1;
66 /***********************************************************************
69 * Clip a rectangle to the DC visible rect.
71 BOOL clip_visrect( DC *dc, RECT *dst, const RECT *src )
75 if (get_dc_visrect( dc, &clip )) intersect_rect( dst, src, &clip );
78 if (GetRgnBox( get_dc_region(dc), &clip )) intersect_rect( dst, dst, &clip );
79 return !is_rect_empty( dst );
82 /***********************************************************************
85 * Update the DC and device clip regions when the ClipRgn or VisRgn have changed.
87 void update_dc_clipping( DC * dc )
89 PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSetDeviceClipping );
93 if (dc->hVisRgn) regions[count++] = dc->hVisRgn;
94 if (dc->hClipRgn) regions[count++] = dc->hClipRgn;
95 if (dc->hMetaRgn) regions[count++] = dc->hMetaRgn;
99 if (!dc->region) dc->region = CreateRectRgn( 0, 0, 0, 0 );
100 CombineRgn( dc->region, regions[0], regions[1], RGN_AND );
101 if (count > 2) CombineRgn( dc->region, dc->region, regions[2], RGN_AND );
103 else /* only one region, we don't need the total region */
105 if (dc->region) DeleteObject( dc->region );
108 physdev->funcs->pSetDeviceClipping( physdev, get_dc_region( dc ));
111 /***********************************************************************
112 * create_default_clip_region
114 * Create a default clipping region when none already exists.
116 static inline void create_default_clip_region( DC * dc )
120 if (!get_dc_visrect( dc, &rect ))
124 rect.right = GetDeviceCaps( dc->hSelf, DESKTOPHORZRES );
125 rect.bottom = GetDeviceCaps( dc->hSelf, DESKTOPVERTRES );
127 dc->hClipRgn = CreateRectRgnIndirect( &rect );
131 /***********************************************************************
132 * null driver fallback implementations
135 INT nulldrv_ExtSelectClipRgn( PHYSDEV dev, HRGN rgn, INT mode )
137 DC *dc = get_nulldrv_dc( dev );
142 if (mode != RGN_COPY)
144 FIXME("Unimplemented: hrgn NULL in mode: %d\n", mode);
147 if (dc->hClipRgn) DeleteObject( dc->hClipRgn );
155 if (dc->layout & LAYOUT_RTL)
157 if (!(mirrored = CreateRectRgn( 0, 0, 0, 0 ))) return ERROR;
158 mirror_region( mirrored, rgn, dc->vis_rect.right - dc->vis_rect.left );
163 create_default_clip_region( dc );
165 if (mode == RGN_COPY)
166 ret = CombineRgn( dc->hClipRgn, rgn, 0, mode );
168 ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, mode);
170 if (mirrored) DeleteObject( mirrored );
172 update_dc_clipping( dc );
176 INT nulldrv_ExcludeClipRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom )
178 DC *dc = get_nulldrv_dc( dev );
179 RECT rect = get_clip_rect( dc, left, top, right, bottom );
183 if (!(rgn = CreateRectRgnIndirect( &rect ))) return ERROR;
184 if (!dc->hClipRgn) create_default_clip_region( dc );
185 ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, RGN_DIFF );
187 if (ret != ERROR) update_dc_clipping( dc );
191 INT nulldrv_IntersectClipRect( PHYSDEV dev, INT left, INT top, INT right, INT bottom )
193 DC *dc = get_nulldrv_dc( dev );
194 RECT rect = get_clip_rect( dc, left, top, right, bottom );
200 dc->hClipRgn = CreateRectRgnIndirect( &rect );
205 if (!(rgn = CreateRectRgnIndirect( &rect ))) return ERROR;
206 ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, rgn, RGN_AND );
209 if (ret != ERROR) update_dc_clipping( dc );
213 INT nulldrv_OffsetClipRgn( PHYSDEV dev, INT x, INT y )
215 DC *dc = get_nulldrv_dc( dev );
216 INT ret = NULLREGION;
220 x = MulDiv( x, dc->vportExtX, dc->wndExtX );
221 y = MulDiv( y, dc->vportExtY, dc->wndExtY );
222 if (dc->layout & LAYOUT_RTL) x = -x;
223 ret = OffsetRgn( dc->hClipRgn, x, y );
224 update_dc_clipping( dc );
230 /***********************************************************************
231 * SelectClipRgn (GDI32.@)
233 INT WINAPI SelectClipRgn( HDC hdc, HRGN hrgn )
235 return ExtSelectClipRgn( hdc, hrgn, RGN_COPY );
239 /******************************************************************************
240 * ExtSelectClipRgn [GDI32.@]
242 INT WINAPI ExtSelectClipRgn( HDC hdc, HRGN hrgn, INT fnMode )
245 DC * dc = get_dc_ptr( hdc );
247 TRACE("%p %p %d\n", hdc, hrgn, fnMode );
251 PHYSDEV physdev = GET_DC_PHYSDEV( dc, pExtSelectClipRgn );
253 retval = physdev->funcs->pExtSelectClipRgn( physdev, hrgn, fnMode );
254 release_dc_ptr( dc );
259 /***********************************************************************
260 * __wine_set_visible_region (GDI32.@)
262 void CDECL __wine_set_visible_region( HDC hdc, HRGN hrgn, const RECT *vis_rect )
266 if (!(dc = get_dc_ptr( hdc ))) return;
268 TRACE( "%p %p %s\n", hdc, hrgn, wine_dbgstr_rect(vis_rect) );
270 /* map region to DC coordinates */
271 OffsetRgn( hrgn, -vis_rect->left, -vis_rect->top );
273 if (dc->hVisRgn) DeleteObject( dc->hVisRgn );
275 dc->vis_rect = *vis_rect;
277 DC_UpdateXforms( dc );
278 update_dc_clipping( dc );
279 release_dc_ptr( dc );
283 /***********************************************************************
284 * OffsetClipRgn (GDI32.@)
286 INT WINAPI OffsetClipRgn( HDC hdc, INT x, INT y )
289 DC *dc = get_dc_ptr( hdc );
291 TRACE("%p %d,%d\n", hdc, x, y );
295 PHYSDEV physdev = GET_DC_PHYSDEV( dc, pOffsetClipRgn );
297 ret = physdev->funcs->pOffsetClipRgn( physdev, x, y );
298 release_dc_ptr( dc );
304 /***********************************************************************
305 * ExcludeClipRect (GDI32.@)
307 INT WINAPI ExcludeClipRect( HDC hdc, INT left, INT top,
308 INT right, INT bottom )
311 DC *dc = get_dc_ptr( hdc );
313 TRACE("%p %d,%d-%d,%d\n", hdc, left, top, right, bottom );
317 PHYSDEV physdev = GET_DC_PHYSDEV( dc, pExcludeClipRect );
319 ret = physdev->funcs->pExcludeClipRect( physdev, left, top, right, bottom );
320 release_dc_ptr( dc );
326 /***********************************************************************
327 * IntersectClipRect (GDI32.@)
329 INT WINAPI IntersectClipRect( HDC hdc, INT left, INT top, INT right, INT bottom )
332 DC *dc = get_dc_ptr( hdc );
334 TRACE("%p %d,%d - %d,%d\n", hdc, left, top, right, bottom );
338 PHYSDEV physdev = GET_DC_PHYSDEV( dc, pIntersectClipRect );
340 ret = physdev->funcs->pIntersectClipRect( physdev, left, top, right, bottom );
341 release_dc_ptr( dc );
347 /***********************************************************************
348 * PtVisible (GDI32.@)
350 BOOL WINAPI PtVisible( HDC hdc, INT x, INT y )
355 DC *dc = get_dc_ptr( hdc );
357 TRACE("%p %d,%d\n", hdc, x, y );
358 if (!dc) return FALSE;
362 LPtoDP( hdc, &pt, 1 );
364 ret = (!get_dc_visrect( dc, &visrect ) ||
365 (pt.x >= visrect.left && pt.x < visrect.right &&
366 pt.y >= visrect.top && pt.y < visrect.bottom));
367 if (ret && get_dc_region( dc )) ret = PtInRegion( get_dc_region( dc ), pt.x, pt.y );
368 release_dc_ptr( dc );
373 /***********************************************************************
374 * RectVisible (GDI32.@)
376 BOOL WINAPI RectVisible( HDC hdc, const RECT* rect )
378 RECT tmpRect, visrect;
380 DC *dc = get_dc_ptr( hdc );
381 if (!dc) return FALSE;
382 TRACE("%p %s\n", hdc, wine_dbgstr_rect( rect ));
385 LPtoDP( hdc, (POINT *)&tmpRect, 2 );
388 ret = (!get_dc_visrect( dc, &visrect ) || intersect_rect( &visrect, &visrect, &tmpRect ));
389 if (ret && get_dc_region( dc )) ret = RectInRegion( get_dc_region( dc ), &tmpRect );
390 release_dc_ptr( dc );
395 /***********************************************************************
396 * GetClipBox (GDI32.@)
398 INT WINAPI GetClipBox( HDC hdc, LPRECT rect )
402 DC *dc = get_dc_ptr( hdc );
403 if (!dc) return ERROR;
406 if (get_dc_region( dc ))
408 ret = GetRgnBox( get_dc_region( dc ), rect );
409 if (get_dc_visrect( dc, &visrect ) && !intersect_rect( rect, rect, &visrect ))
412 else ret = get_dc_visrect( dc, rect ) ? SIMPLEREGION : NULLREGION;
414 if (dc->layout & LAYOUT_RTL)
416 int tmp = rect->left;
417 rect->left = rect->right - 1;
418 rect->right = tmp - 1;
420 DPtoLP( hdc, (LPPOINT)rect, 2 );
421 release_dc_ptr( dc );
422 TRACE("%p => %d %s\n", hdc, ret, wine_dbgstr_rect( rect ));
427 /***********************************************************************
428 * GetClipRgn (GDI32.@)
430 INT WINAPI GetClipRgn( HDC hdc, HRGN hRgn )
434 if ((dc = get_dc_ptr( hdc )))
438 if( CombineRgn(hRgn, dc->hClipRgn, 0, RGN_COPY) != ERROR )
441 if (dc->layout & LAYOUT_RTL)
442 mirror_region( hRgn, hRgn, dc->vis_rect.right - dc->vis_rect.left );
446 release_dc_ptr( dc );
452 /***********************************************************************
453 * GetMetaRgn (GDI32.@)
455 INT WINAPI GetMetaRgn( HDC hdc, HRGN hRgn )
458 DC * dc = get_dc_ptr( hdc );
462 if (dc->hMetaRgn && CombineRgn( hRgn, dc->hMetaRgn, 0, RGN_COPY ) != ERROR)
465 if (dc->layout & LAYOUT_RTL)
466 mirror_region( hRgn, hRgn, dc->vis_rect.right - dc->vis_rect.left );
468 release_dc_ptr( dc );
474 /***********************************************************************
475 * GetRandomRgn [GDI32.@]
478 * This function is documented in MSDN online for the case of
479 * iCode == SYSRGN (4).
481 * For iCode == 1 it should return the clip region
482 * 2 " " " the meta region
483 * 3 " " " the intersection of the clip with
484 * the meta region (== 'Rao' region).
486 * See http://www.codeproject.com/gdi/cliprgnguide.asp
488 INT WINAPI GetRandomRgn(HDC hDC, HRGN hRgn, INT iCode)
492 DC *dc = get_dc_ptr( hDC );
499 if (dc->hClipRgn) CombineRgn( hRgn, dc->hClipRgn, 0, RGN_COPY );
503 if (dc->hMetaRgn) CombineRgn( hRgn, dc->hMetaRgn, 0, RGN_COPY );
507 if (dc->hClipRgn && dc->hMetaRgn) CombineRgn( hRgn, dc->hClipRgn, dc->hMetaRgn, RGN_AND );
508 else if (dc->hClipRgn) CombineRgn( hRgn, dc->hClipRgn, 0, RGN_COPY );
509 else if (dc->hMetaRgn) CombineRgn( hRgn, dc->hMetaRgn, 0, RGN_COPY );
512 case SYSRGN: /* == 4 */
515 CombineRgn( hRgn, dc->hVisRgn, 0, RGN_COPY );
516 else if (get_dc_visrect( dc, &visrect ))
517 SetRectRgn( hRgn, visrect.left, visrect.top, visrect.right, visrect.bottom );
520 /* On Windows NT/2000, the SYSRGN returned is in screen coordinates */
521 if (ret && !(GetVersion() & 0x80000000)) OffsetRgn( hRgn, dc->vis_rect.left, dc->vis_rect.top );
524 WARN("Unknown code %d\n", iCode);
528 release_dc_ptr( dc );
533 /***********************************************************************
534 * SetMetaRgn (GDI32.@)
536 INT WINAPI SetMetaRgn( HDC hdc )
540 DC *dc = get_dc_ptr( hdc );
542 if (!dc) return ERROR;
548 /* the intersection becomes the new meta region */
549 CombineRgn( dc->hMetaRgn, dc->hMetaRgn, dc->hClipRgn, RGN_AND );
550 DeleteObject( dc->hClipRgn );
555 dc->hMetaRgn = dc->hClipRgn;
559 /* else nothing to do */
561 /* Note: no need to call update_dc_clipping, the overall clip region hasn't changed */
563 ret = GetRgnBox( dc->hMetaRgn, &dummy );
564 release_dc_ptr( dc );