objects/clipping.c

   1 /*
   2  * DC clipping functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  */
   6
   7 #include <stdio.h>
   8 #include "region.h"
   9 #include "metafile.h"
  10 #include "stddebug.h"
  11 /* #define DEBUG_CLIPPING */
  12 #include "debug.h"
  13
  14 /***********************************************************************
  15  *           CLIPPING_SetDeviceClipping
  16  *
  17  * Set the clip region of the physical device.
  18  */
  19 static void CLIPPING_SetDeviceClipping( DC * dc )
  20 {
  21     RGNOBJ *obj = (RGNOBJ *) GDI_GetObjPtr(dc->w.hGCClipRgn, REGION_MAGIC);
  22     if (!obj)
  23     {
  24         fprintf( stderr, "SetDeviceClipping: Rgn is 0. Please report this.\n");
  25         exit(1);
  26     }
  27     if (obj->xrgn)
  28     {
  29         XSetRegion( display, dc->u.x.gc, obj->xrgn );
  30         XSetClipOrigin( display, dc->u.x.gc, dc->w.DCOrgX, dc->w.DCOrgY );
  31     }
  32     else  /* Clip everything */
  33     {
  34         XSetClipRectangles( display, dc->u.x.gc, 0, 0, NULL, 0, 0 );
  35     }
  36 }
  37
  38
  39 /***********************************************************************
  40  *           CLIPPING_UpdateGCRegion
  41  *
  42  * Update the GC clip region when the ClipRgn or VisRgn have changed.
  43  */
  44 void CLIPPING_UpdateGCRegion( DC * dc )
  45 {
  46     if (!dc->w.hGCClipRgn) dc->w.hGCClipRgn = CreateRectRgn( 0, 0, 0, 0 );
  47
  48     if (!dc->w.hVisRgn)
  49     {
  50         fprintf( stderr, "UpdateGCRegion: hVisRgn is zero. Please report this.\n" );
  51         exit(1);
  52     }
  53     if (!dc->w.hClipRgn)
  54         CombineRgn( dc->w.hGCClipRgn, dc->w.hVisRgn, 0, RGN_COPY );
  55     else
  56         CombineRgn( dc->w.hGCClipRgn, dc->w.hClipRgn, dc->w.hVisRgn, RGN_AND );
  57     CLIPPING_SetDeviceClipping( dc );
  58 }
  59
  60
  61 /***********************************************************************
  62  *           SelectClipRgn    (GDI.44)
  63  */
  64 int SelectClipRgn( HDC hdc, HRGN hrgn )
  65 {
  66     int retval;
  67     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
  68     if (!dc) return ERROR;
  69
  70     dprintf_clipping(stddeb, "SelectClipRgn: %04x %04x\n", hdc, hrgn );
  71
  72     if (hrgn)
  73     {
  74         if (!dc->w.hClipRgn) dc->w.hClipRgn = CreateRectRgn(0,0,0,0);
  75         retval = CombineRgn( dc->w.hClipRgn, hrgn, 0, RGN_COPY );
  76     }
  77     else
  78     {
  79         if (dc->w.hClipRgn) DeleteObject( dc->w.hClipRgn );
  80         dc->w.hClipRgn = 0;
  81         retval = SIMPLEREGION; /* Clip region == whole DC */
  82     }
  83     CLIPPING_UpdateGCRegion( dc );
  84     return retval;
  85 }
  86
  87
  88 /***********************************************************************
  89  *           SelectVisRgn    (GDI.105)
  90  */
  91 int SelectVisRgn( HDC hdc, HRGN hrgn )
  92 {
  93     int retval;
  94     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
  95     if (!dc || !hrgn) return ERROR;
  96
  97     dprintf_clipping(stddeb, "SelectVisRgn: %04x %04x\n", hdc, hrgn );
  98
  99     retval = CombineRgn( dc->w.hVisRgn, hrgn, 0, RGN_COPY );
 100     CLIPPING_UpdateGCRegion( dc );
 101     return retval;
 102 }
 103
 104
 105 /***********************************************************************
 106  *           OffsetClipRgn    (GDI.32)
 107  */
 108 int OffsetClipRgn( HDC hdc, short x, short y )
 109 {
 110     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 111     if (!dc)
 112     {
 113         dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
 114         if (!dc) return ERROR;
 115         MF_MetaParam2(dc, META_OFFSETCLIPRGN, x, y);
 116         return NULLREGION;   /* ?? */
 117     }
 118
 119     dprintf_clipping(stddeb, "OffsetClipRgn: %04x %d,%d\n", hdc, x, y );
 120
 121     if (dc->w.hClipRgn)
 122     {
 123         int retval = OffsetRgn( dc->w.hClipRgn, XLPTODP(dc,x), YLPTODP(dc,y) );
 124         CLIPPING_UpdateGCRegion( dc );
 125         return retval;
 126     }
 127     else return SIMPLEREGION; /* Clip region == client area */
 128 }
 129
 130
 131 /***********************************************************************
 132  *           OffsetVisRgn    (GDI.102)
 133  */
 134 int OffsetVisRgn( HDC hdc, short x, short y )
 135 {
 136     int retval;
 137     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 138     if (!dc) return ERROR;
 139     dprintf_clipping(stddeb, "OffsetVisRgn: %04x %d,%d\n", hdc, x, y );
 140     retval = OffsetRgn( dc->w.hVisRgn, x, y );
 141     CLIPPING_UpdateGCRegion( dc );
 142     return retval;
 143 }
 144
 145
 146 /***********************************************************************
 147  *           CLIPPING_IntersectClipRect
 148  *
 149  * Helper function for {Intersect,Exclude}ClipRect
 150  */
 151 static int CLIPPING_IntersectClipRect( DC * dc, short left, short top,
 152                                        short right, short bottom, BOOL exclude)
 153 {
 154     HRGN tempRgn, newRgn;
 155     int ret;
 156
 157     left   = XLPTODP( dc, left );
 158     right  = XLPTODP( dc, right );
 159     top    = YLPTODP( dc, top );
 160     bottom = YLPTODP( dc, bottom );
 161
 162     if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return ERROR;
 163     if (!(tempRgn = CreateRectRgn( left, top, right, bottom )))
 164     {
 165         DeleteObject( newRgn );
 166         return ERROR;
 167     }
 168     ret = CombineRgn( newRgn, dc->w.hClipRgn ? dc->w.hClipRgn : dc->w.hVisRgn,
 169                       tempRgn, exclude ? RGN_DIFF : RGN_AND);
 170     DeleteObject( tempRgn );
 171
 172     if (ret != ERROR)
 173     {
 174         if (dc->w.hClipRgn) DeleteObject( dc->w.hClipRgn );
 175         dc->w.hClipRgn = newRgn;
 176         CLIPPING_UpdateGCRegion( dc );
 177     }
 178     else DeleteObject( newRgn );
 179     return ret;
 180 }
 181
 182
 183 /***********************************************************************
 184  *           ExcludeClipRect    (GDI.21)
 185  */
 186 int ExcludeClipRect( HDC hdc, short left, short top,
 187                      short right, short bottom )
 188 {
 189     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 190     if (!dc)
 191     {
 192         dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
 193         if (!dc) return ERROR;
 194         MF_MetaParam4(dc, META_EXCLUDECLIPRECT, left, top, right, bottom);
 195         return NULLREGION;   /* ?? */
 196     }
 197
 198     dprintf_clipping(stddeb, "ExcludeClipRect: %04x %dx%d,%dx%d\n",
 199             hdc, left, top, right, bottom );
 200     return CLIPPING_IntersectClipRect( dc, left, top, right, bottom, TRUE );
 201 }
 202
 203
 204 /***********************************************************************
 205  *           IntersectClipRect    (GDI.22)
 206  */
 207 int IntersectClipRect( HDC hdc, short left, short top,
 208                        short right, short bottom )
 209 {
 210     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 211     if (!dc)
 212     {
 213         dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
 214         if (!dc) return ERROR;
 215         MF_MetaParam4(dc, META_INTERSECTCLIPRECT, left, top, right, bottom);
 216         return NULLREGION;   /* ?? */
 217     }
 218
 219     dprintf_clipping(stddeb, "IntersectClipRect: %04x %dx%d,%dx%d\n",
 220             hdc, left, top, right, bottom );
 221     return CLIPPING_IntersectClipRect( dc, left, top, right, bottom, FALSE );
 222 }
 223
 224
 225 /***********************************************************************
 226  *           CLIPPING_IntersectVisRect
 227  *
 228  * Helper function for {Intersect,Exclude}VisRect
 229  */
 230 static int CLIPPING_IntersectVisRect( DC * dc, short left, short top,
 231                                       short right, short bottom, BOOL exclude )
 232 {
 233     HRGN tempRgn, newRgn;
 234     int ret;
 235
 236     left   = XLPTODP( dc, left );
 237     right  = XLPTODP( dc, right );
 238     top    = YLPTODP( dc, top );
 239     bottom = YLPTODP( dc, bottom );
 240
 241     if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return ERROR;
 242     if (!(tempRgn = CreateRectRgn( left, top, right, bottom )))
 243     {
 244         DeleteObject( newRgn );
 245         return ERROR;
 246     }
 247     ret = CombineRgn( newRgn, dc->w.hVisRgn, tempRgn,
 248                       exclude ? RGN_DIFF : RGN_AND);
 249     DeleteObject( tempRgn );
 250
 251     if (ret != ERROR)
 252     {
 253         RGNOBJ *newObj  = (RGNOBJ*)GDI_GetObjPtr( newRgn, REGION_MAGIC);
 254         RGNOBJ *prevObj = (RGNOBJ*)GDI_GetObjPtr( dc->w.hVisRgn, REGION_MAGIC);
 255         if (newObj && prevObj) newObj->header.hNext = prevObj->header.hNext;
 256         DeleteObject( dc->w.hVisRgn );
 257         dc->w.hVisRgn = newRgn;
 258         CLIPPING_UpdateGCRegion( dc );
 259     }
 260     else DeleteObject( newRgn );
 261     return ret;
 262 }
 263
 264
 265 /***********************************************************************
 266  *           ExcludeVisRect    (GDI.73)
 267  */
 268 int ExcludeVisRect( HDC hdc, short left, short top, short right, short bottom )
 269 {
 270     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 271     if (!dc) return ERROR;
 272     dprintf_clipping(stddeb, "ExcludeVisRect: %04x %dx%d,%dx%d\n",
 273             hdc, left, top, right, bottom );
 274     return CLIPPING_IntersectVisRect( dc, left, top, right, bottom, TRUE );
 275 }
 276
 277
 278 /***********************************************************************
 279  *           IntersectVisRect    (GDI.98)
 280  */
 281 int IntersectVisRect( HDC hdc, short left, short top,
 282                       short right, short bottom )
 283 {
 284     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 285     if (!dc) return ERROR;
 286     dprintf_clipping(stddeb, "IntersectVisRect: %04x %dx%d,%dx%d\n",
 287             hdc, left, top, right, bottom );
 288     return CLIPPING_IntersectVisRect( dc, left, top, right, bottom, FALSE );
 289 }
 290
 291
 292 /***********************************************************************
 293  *           PtVisible    (GDI.103)
 294  */
 295 BOOL PtVisible( HDC hdc, short x, short y )
 296 {
 297     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 298     if (!dc) return ERROR;
 299
 300     dprintf_clipping(stddeb, "PtVisible: %04x %d,%d\n", hdc, x, y );
 301     if (!dc->w.hGCClipRgn) return FALSE;
 302     return PtInRegion( dc->w.hGCClipRgn, XLPTODP(dc,x), YLPTODP(dc,y) );
 303 }
 304
 305
 306 /***********************************************************************
 307  *           RectVisible    (GDI.104)
 308  */
 309 BOOL RectVisible( HDC hdc, LPRECT rect )
 310 {
 311     RECT tmpRect;
 312     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 313     if (!dc) return FALSE;
 314     dprintf_clipping(stddeb,"RectVisible: %04x %d,%dx%d,%d\n",
 315                      hdc, rect->left, rect->top, rect->right, rect->bottom );
 316     if (!dc->w.hGCClipRgn) return FALSE;
 317     /* copy rectangle to avoid overwriting by LPtoDP */
 318     tmpRect = *rect;
 319     LPtoDP( hdc, (LPPOINT)&tmpRect, 2 );
 320     return RectInRegion( dc->w.hGCClipRgn, &tmpRect );
 321 }
 322
 323
 324 /***********************************************************************
 325  *           GetClipBox    (GDI.77)
 326  */
 327 int GetClipBox( HDC hdc, LPRECT rect )
 328 {
 329     int ret;
 330     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 331     if (!dc) return ERROR;
 332     dprintf_clipping(stddeb, "GetClipBox: %04x %p\n", hdc, rect );
 333     ret = GetRgnBox( dc->w.hGCClipRgn, rect );
 334     DPtoLP( hdc, (LPPOINT)rect, 2 );
 335     return ret;
 336 }
 337
 338
 339 /***********************************************************************
 340  *           SaveVisRgn    (GDI.129)
 341  */
 342 HRGN SaveVisRgn( HDC hdc )
 343 {
 344     HRGN copy;
 345     RGNOBJ *obj, *copyObj;
 346     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 347     if (!dc) return 0;
 348     dprintf_clipping(stddeb, "SaveVisRgn: %04x\n", hdc );
 349     if (!dc->w.hVisRgn)
 350     {
 351         fprintf( stderr, "SaveVisRgn: hVisRgn is zero. Please report this.\n" );
 352         exit(1);
 353     }
 354     if (!(obj = (RGNOBJ *) GDI_GetObjPtr( dc->w.hVisRgn, REGION_MAGIC )))
 355         return 0;
 356     if (!(copy = CreateRectRgn( 0, 0, 0, 0 ))) return 0;
 357     CombineRgn( copy, dc->w.hVisRgn, 0, RGN_COPY );
 358     if (!(copyObj = (RGNOBJ *) GDI_GetObjPtr( copy, REGION_MAGIC )))
 359         return 0;
 360     copyObj->header.hNext = obj->header.hNext;
 361     obj->header.hNext = copy;
 362     return copy;
 363 }
 364
 365
 366 /***********************************************************************
 367  *           RestoreVisRgn    (GDI.130)
 368  */
 369 int RestoreVisRgn( HDC hdc )
 370 {
 371     HRGN saved;
 372     RGNOBJ *obj, *savedObj;
 373     DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
 374     if (!dc || !dc->w.hVisRgn) return ERROR;
 375     dprintf_clipping(stddeb, "RestoreVisRgn: %04x\n", hdc );
 376     if (!(obj = (RGNOBJ *) GDI_GetObjPtr( dc->w.hVisRgn, REGION_MAGIC )))
 377         return ERROR;
 378     if (!(saved = obj->header.hNext)) return ERROR;
 379     if (!(savedObj = (RGNOBJ *) GDI_GetObjPtr( saved, REGION_MAGIC )))
 380         return ERROR;
 381     DeleteObject( dc->w.hVisRgn );
 382     dc->w.hVisRgn = saved;
 383     CLIPPING_UpdateGCRegion( dc );
 384     return savedObj->xrgn ? COMPLEXREGION : NULLREGION;
 385 }