src/osx/carbon/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // File:      src/osx/carbon/region.cpp
   3 // Purpose:   Region class
   4 // Author:    Stefan Csomor
   5 // Created:   Fri Oct 24 10:46:34 MET 1997
   6 // RCS-ID:    $Id$
   7 // Copyright: (c) 1997 Stefan Csomor
   8 // Licence:   wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #include "wx/wxprec.h"
  12
  13 #if wxOSX_USE_COCOA_OR_CARBON
  14
  15 #include "wx/region.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/gdicmn.h"
  19     #include "wx/dcmemory.h"
  20 #endif
  21
  22 #include "wx/osx/private.h"
  23
  24 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  25 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
  26
  27 //-----------------------------------------------------------------------------
  28 // wxRegionRefData implementation
  29 //-----------------------------------------------------------------------------
  30
  31 class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
  32 {
  33 public:
  34     wxRegionRefData()
  35     {
  36         m_macRgn.reset( HIShapeCreateMutable() );
  37     }
  38
  39     wxRegionRefData(wxCFRef<HIShapeRef> &region)
  40     {
  41         m_macRgn.reset( HIShapeCreateMutableCopy(region) );
  42     }
  43
  44     wxRegionRefData(long x, long y, long w, long h)
  45     {
  46         CGRect r = CGRectMake(x,y,w,h);
  47         wxCFRef<HIShapeRef> rect(HIShapeCreateWithRect(&r));
  48         m_macRgn.reset( HIShapeCreateMutableCopy(rect) );
  49     }
  50
  51     wxRegionRefData(const wxRegionRefData& data)
  52         : wxGDIRefData()
  53     {
  54         m_macRgn.reset( HIShapeCreateMutableCopy(data.m_macRgn) );
  55     }
  56
  57     virtual ~wxRegionRefData()
  58     {
  59     }
  60
  61     wxCFRef<HIMutableShapeRef> m_macRgn;
  62 };
  63
  64 #define M_REGION (((wxRegionRefData*)m_refData)->m_macRgn)
  65 #define OTHER_M_REGION(a) (((wxRegionRefData*)(a.m_refData))->m_macRgn)
  66
  67 //-----------------------------------------------------------------------------
  68 // wxRegion
  69 //-----------------------------------------------------------------------------
  70
  71 wxRegion::wxRegion(WXHRGN hRegion )
  72 {
  73     wxCFRef< HIShapeRef > shape( (HIShapeRef) hRegion );
  74     m_refData = new wxRegionRefData(shape);
  75 }
  76
  77 wxRegion::wxRegion(long x, long y, long w, long h)
  78 {
  79     m_refData = new wxRegionRefData(x , y , w , h );
  80 }
  81
  82 wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
  83 {
  84     m_refData = new wxRegionRefData(topLeft.x , topLeft.y ,
  85                                     bottomRight.x - topLeft.x,
  86                                     bottomRight.y - topLeft.y);
  87 }
  88
  89 wxRegion::wxRegion(const wxRect& rect)
  90 {
  91     m_refData = new wxRegionRefData(rect.x , rect.y , rect.width , rect.height);
  92 }
  93
  94 wxRegion::wxRegion(size_t n, const wxPoint *points, wxPolygonFillMode fillStyle)
  95 {
  96     // Set the region to a polygon shape generically using a bitmap with the
  97     // polygon drawn on it.
  98
  99     m_refData = new wxRegionRefData();
 100
 101     wxCoord mx = 0;
 102     wxCoord my = 0;
 103     wxPoint p;
 104     size_t idx;
 105
 106     // Find the max size needed to draw the polygon
 107     for (idx=0; idx<n; idx++)
 108     {
 109         wxPoint pt = points[idx];
 110         if (pt.x > mx)
 111             mx = pt.x;
 112         if (pt.y > my)
 113             my = pt.y;
 114     }
 115
 116     // Make the bitmap
 117     wxBitmap bmp(mx, my);
 118     wxMemoryDC dc(bmp);
 119     dc.SetBackground(*wxBLACK_BRUSH);
 120     dc.Clear();
 121     dc.SetPen(*wxWHITE_PEN);
 122     dc.SetBrush(*wxWHITE_BRUSH);
 123     dc.DrawPolygon(n, (wxPoint*)points, 0, 0, fillStyle);
 124     dc.SelectObject(wxNullBitmap);
 125     bmp.SetMask(new wxMask(bmp, *wxBLACK));
 126
 127     // Use it to set this region
 128     Union(bmp);
 129 }
 130
 131 wxRegion::~wxRegion()
 132 {
 133     // m_refData unrefed in ~wxObject
 134 }
 135
 136 wxGDIRefData *wxRegion::CreateGDIRefData() const
 137 {
 138     return new wxRegionRefData;
 139 }
 140
 141 wxGDIRefData *wxRegion::CloneGDIRefData(const wxGDIRefData *data) const
 142 {
 143     return new wxRegionRefData(*static_cast<const wxRegionRefData *>(data));
 144 }
 145
 146 //-----------------------------------------------------------------------------
 147 //# Modify region
 148 //-----------------------------------------------------------------------------
 149
 150 //! Clear current region
 151 void wxRegion::Clear()
 152 {
 153     UnRef();
 154 }
 155
 156 // Move the region
 157 bool wxRegion::DoOffset(wxCoord x, wxCoord y)
 158 {
 159     wxCHECK_MSG( m_refData, false, wxT("invalid wxRegion") );
 160
 161     if ( !x && !y )
 162         // nothing to do
 163         return true;
 164
 165     AllocExclusive();
 166
 167     verify_noerr( HIShapeOffset( M_REGION , x , y ) ) ;
 168
 169     return true ;
 170 }
 171
 172
 173 //! Union /e region with this.
 174 bool wxRegion::DoCombine(const wxRegion& region, wxRegionOp op)
 175 {
 176     wxCHECK_MSG( region.IsOk(), false, wxT("invalid wxRegion") );
 177
 178     // Handle the special case of not initialized (e.g. default constructed)
 179     // region as we can't use HIShape functions if we don't have any shape.
 180     if ( !m_refData )
 181     {
 182         switch ( op )
 183         {
 184             case wxRGN_COPY:
 185             case wxRGN_OR:
 186             case wxRGN_XOR:
 187                 // These operations make sense with a null region.
 188                 *this = region;
 189                 return true;
 190
 191             case wxRGN_AND:
 192             case wxRGN_DIFF:
 193                 // Those ones don't really make sense so just leave this region
 194                 // empty/invalid.
 195                 return false;
 196         }
 197
 198         wxFAIL_MSG( wxT("Unknown region operation") );
 199         return false;
 200     }
 201
 202     AllocExclusive();
 203
 204     switch (op)
 205     {
 206         case wxRGN_AND:
 207             verify_noerr( HIShapeIntersect( M_REGION , OTHER_M_REGION(region) , M_REGION ) );
 208             break ;
 209
 210         case wxRGN_OR:
 211             verify_noerr( HIShapeUnion( M_REGION , OTHER_M_REGION(region) , M_REGION ) );
 212             break ;
 213
 214         case wxRGN_XOR:
 215             {
 216                 // XOR is defined as the difference between union and intersection
 217                 wxCFRef< HIShapeRef > unionshape( HIShapeCreateUnion( M_REGION , OTHER_M_REGION(region) ) );
 218                 wxCFRef< HIShapeRef > intersectionshape( HIShapeCreateIntersection( M_REGION , OTHER_M_REGION(region) ) );
 219                 verify_noerr( HIShapeDifference( unionshape, intersectionshape, M_REGION ) );
 220             }
 221             break ;
 222
 223         case wxRGN_DIFF:
 224             verify_noerr( HIShapeDifference( M_REGION , OTHER_M_REGION(region) , M_REGION ) ) ;
 225             break ;
 226
 227         case wxRGN_COPY:
 228         default:
 229             M_REGION.reset( HIShapeCreateMutableCopy( OTHER_M_REGION(region) ) );
 230             break ;
 231     }
 232
 233     return true;
 234 }
 235
 236 //-----------------------------------------------------------------------------
 237 //# Information on region
 238 //-----------------------------------------------------------------------------
 239
 240 bool wxRegion::DoIsEqual(const wxRegion& region) const
 241 {
 242     // There doesn't seem to be any native function for checking the equality
 243     // of HIShapes so we compute their differences to determine if they are
 244     // equal.
 245     wxRegion r(*this);
 246     r.Subtract(region);
 247
 248     if ( !r.IsEmpty() )
 249         return false;
 250
 251     wxRegion r2(region);
 252     r2.Subtract(*this);
 253
 254     return r2.IsEmpty();
 255 }
 256
 257 // Outer bounds of region
 258 bool wxRegion::DoGetBox(wxCoord& x, wxCoord& y, wxCoord& w, wxCoord& h) const
 259 {
 260     if (m_refData)
 261     {
 262         CGRect box ;
 263         HIShapeGetBounds( M_REGION , &box ) ;
 264         x = static_cast<int>(box.origin.x);
 265         y = static_cast<int>(box.origin.y);
 266         w = static_cast<int>(box.size.width);
 267         h = static_cast<int>(box.size.height);
 268
 269         return true;
 270     }
 271     else
 272     {
 273         x = y = w = h = 0;
 274
 275         return false;
 276     }
 277 }
 278
 279 // Is region empty?
 280 bool wxRegion::IsEmpty() const
 281 {
 282     if ( m_refData )
 283         return HIShapeIsEmpty( M_REGION ) ;
 284     else
 285         return true ;
 286 }
 287
 288 WXHRGN wxRegion::GetWXHRGN() const
 289 {
 290     if ( !m_refData )
 291         return NULL;
 292
 293     return M_REGION ;
 294 }
 295
 296 //-----------------------------------------------------------------------------
 297 //# Tests
 298 //-----------------------------------------------------------------------------
 299
 300 // Does the region contain the point?
 301 wxRegionContain wxRegion::DoContainsPoint(wxCoord x, wxCoord y) const
 302 {
 303     if (!m_refData)
 304         return wxOutRegion;
 305
 306     CGPoint p = CGPointMake( x, y ) ;
 307     if (HIShapeContainsPoint( M_REGION , &p ) )
 308         return wxInRegion;
 309
 310     return wxOutRegion;
 311 }
 312
 313 // Does the region contain the rectangle (x, y, w, h)?
 314 wxRegionContain wxRegion::DoContainsRect(const wxRect& r) const
 315 {
 316     if (!m_refData)
 317         return wxOutRegion;
 318
 319     CGRect rect = CGRectMake(r.x,r.y,r.width,r.height);
 320     wxCFRef<HIShapeRef> rectshape(HIShapeCreateWithRect(&rect));
 321     wxCFRef<HIShapeRef> intersect(HIShapeCreateIntersection(rectshape,M_REGION));
 322     CGRect bounds;
 323     HIShapeGetBounds(intersect, &bounds);
 324
 325     if ( HIShapeIsRectangular(intersect) && CGRectEqualToRect(rect,bounds) )
 326         return wxInRegion;
 327     else if ( HIShapeIsEmpty( intersect ) )
 328         return wxOutRegion;
 329     else
 330         return wxPartRegion;
 331 }
 332
 333 ///////////////////////////////////////////////////////////////////////////////
 334 //                                                                           //
 335 //                               wxRegionIterator                            //
 336 //                                                                           //
 337 ///////////////////////////////////////////////////////////////////////////////
 338
 339 /*!
 340  * Initialize empty iterator
 341  */
 342 wxRegionIterator::wxRegionIterator()
 343     : m_current(0), m_numRects(0), m_rects(NULL)
 344 {
 345 }
 346
 347 wxRegionIterator::~wxRegionIterator()
 348 {
 349     wxDELETEA(m_rects);
 350 }
 351
 352 wxRegionIterator::wxRegionIterator(const wxRegionIterator& iterator)
 353     : wxObject()
 354     , m_current(iterator.m_current)
 355     , m_numRects(0)
 356     , m_rects(NULL)
 357 {
 358     SetRects(iterator.m_numRects, iterator.m_rects);
 359 }
 360
 361 wxRegionIterator& wxRegionIterator::operator=(const wxRegionIterator& iterator)
 362 {
 363     m_current  = iterator.m_current;
 364     SetRects(iterator.m_numRects, iterator.m_rects);
 365
 366     return *this;
 367 }
 368
 369 /*!
 370  * Set iterator rects for region
 371  */
 372 void wxRegionIterator::SetRects(long numRects, wxRect *rects)
 373 {
 374     wxDELETEA(m_rects);
 375
 376     if (rects && (numRects > 0))
 377     {
 378         int i;
 379
 380         m_rects = new wxRect[numRects];
 381         for (i = 0; i < numRects; i++)
 382             m_rects[i] = rects[i];
 383     }
 384
 385     m_numRects = numRects;
 386 }
 387
 388 /*!
 389  * Initialize iterator for region
 390  */
 391 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 392 {
 393     m_rects = NULL;
 394
 395     Reset(region);
 396 }
 397
 398 /*!
 399  * Reset iterator for a new /e region.
 400  */
 401
 402 class RegionToRectsCallbackData
 403 {
 404 public :
 405     wxRect* m_rects ;
 406     long m_current ;
 407 };
 408
 409 OSStatus wxOSXRegionToRectsCounterCallback(
 410     int message, HIShapeRef WXUNUSED(region), const CGRect *WXUNUSED(rect), void *data )
 411 {
 412     long *m_numRects = (long*) data ;
 413     if ( message == kHIShapeEnumerateInit )
 414     {
 415         (*m_numRects) = 0 ;
 416     }
 417     else if (message == kHIShapeEnumerateRect)
 418     {
 419         (*m_numRects) += 1 ;
 420     }
 421
 422     return noErr;
 423 }
 424
 425 OSStatus wxOSXRegionToRectsSetterCallback(
 426     int message, HIShapeRef WXUNUSED(region), const CGRect *rect, void *data )
 427 {
 428     if (message == kHIShapeEnumerateRect)
 429     {
 430         RegionToRectsCallbackData *cb = (RegionToRectsCallbackData*) data ;
 431         cb->m_rects[cb->m_current++] = wxRect( rect->origin.x , rect->origin.y , rect->size.width , rect->size.height ) ;
 432     }
 433
 434     return noErr;
 435 }
 436
 437 void wxRegionIterator::Reset(const wxRegion& region)
 438 {
 439     m_current = 0;
 440     m_region = region;
 441
 442     wxDELETEA(m_rects);
 443
 444     if (m_region.IsEmpty())
 445     {
 446         m_numRects = 0;
 447     }
 448     else
 449     {
 450 #if 0
 451         // fallback code in case we ever need it again
 452         // copying this to a path and dissecting the path would be an option
 453         m_numRects = 1;
 454         m_rects = new wxRect[m_numRects];
 455         m_rects[0] = m_region.GetBox();
 456 #endif
 457         OSStatus err = HIShapeEnumerate (OTHER_M_REGION(region), kHIShapeParseFromTopLeft, wxOSXRegionToRectsCounterCallback,
 458             (void*)&m_numRects);
 459         if (err == noErr)
 460         {
 461             m_rects = new wxRect[m_numRects];
 462             RegionToRectsCallbackData data ;
 463             data.m_rects = m_rects ;
 464             data.m_current = 0 ;
 465             HIShapeEnumerate( OTHER_M_REGION(region), kHIShapeParseFromTopLeft, wxOSXRegionToRectsSetterCallback,
 466                 (void*)&data );
 467         }
 468         else
 469         {
 470             m_numRects = 0;
 471         }
 472     }
 473 }
 474
 475 /*!
 476  * Increment iterator. The rectangle returned is the one after the
 477  * incrementation.
 478  */
 479 wxRegionIterator& wxRegionIterator::operator ++ ()
 480 {
 481     if (m_current < m_numRects)
 482         ++m_current;
 483
 484     return *this;
 485 }
 486
 487 /*!
 488  * Increment iterator. The rectangle returned is the one before the
 489  * incrementation.
 490  */
 491 wxRegionIterator wxRegionIterator::operator ++ (int)
 492 {
 493     wxRegionIterator previous(*this);
 494
 495     if (m_current < m_numRects)
 496         ++m_current;
 497
 498     return previous;
 499 }
 500
 501 long wxRegionIterator::GetX() const
 502 {
 503     if (m_current < m_numRects)
 504         return m_rects[m_current].x;
 505
 506     return 0;
 507 }
 508
 509 long wxRegionIterator::GetY() const
 510 {
 511     if (m_current < m_numRects)
 512         return m_rects[m_current].y;
 513
 514     return 0;
 515 }
 516
 517 long wxRegionIterator::GetW() const
 518 {
 519     if (m_current < m_numRects)
 520         return m_rects[m_current].width ;
 521
 522     return 0;
 523 }
 524
 525 long wxRegionIterator::GetH() const
 526 {
 527     if (m_current < m_numRects)
 528         return m_rects[m_current].height;
 529
 530     return 0;
 531 }
 532
 533 #endif