src/x11/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // File:      region.cpp
   3 // Purpose:   Region class
   4 // Author:    Markus Holzem, Julian Smart, Robert Roebling
   5 // Created:   Fri Oct 24 10:46:34 MET 1997
   6 // RCS-ID:    $Id$
   7 // Copyright: (c) 1997 Markus Holzem, Julian Smart, Robert Roebling
   8 // Licence:   wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifdef __GNUG__
  12 #pragma implementation "region.h"
  13 #endif
  14
  15 #include "wx/region.h"
  16 #include "wx/gdicmn.h"
  17 #include "wx/log.h"
  18
  19 #ifdef __VMS__
  20 #pragma message disable nosimpint
  21 #endif
  22 #include "wx/x11/private.h"
  23 #include "X11/Xutil.h"
  24 #ifdef __VMS__
  25 #pragma message enable nosimpint
  26 #endif
  27
  28 // ----------------------------------------------------------------------------
  29 // wxRegionRefData: private class containing the information about the region
  30 // ----------------------------------------------------------------------------
  31
  32 class wxRegionRefData : public wxObjectRefData
  33 {
  34 public:
  35     wxRegionRefData()
  36     {
  37         m_region = NULL;
  38     }
  39
  40     wxRegionRefData(const wxRegionRefData& refData)
  41     {
  42         m_region = XCreateRegion();
  43         XUnionRegion( refData.m_region, m_region, m_region );
  44     }
  45
  46     ~wxRegionRefData()
  47     {
  48         if (m_region)
  49             XDestroyRegion( m_region );
  50     }
  51
  52     Region m_region;
  53 };
  54
  55 // ----------------------------------------------------------------------------
  56 // macros
  57 // ----------------------------------------------------------------------------
  58
  59 #define M_REGIONDATA ((wxRegionRefData *)m_refData)
  60 #define M_REGIONDATA_OF(rgn) ((wxRegionRefData *)(rgn.m_refData))
  61
  62 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject);
  63 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator,wxObject);
  64
  65 // ----------------------------------------------------------------------------
  66 // wxRegion construction
  67 // ----------------------------------------------------------------------------
  68
  69 #define M_REGIONDATA ((wxRegionRefData *)m_refData)
  70
  71 void wxRegion::InitRect(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
  72 {
  73     XRectangle rect;
  74     rect.x = x;
  75     rect.y = y;
  76     rect.width = w;
  77     rect.height = h;
  78
  79     m_refData = new wxRegionRefData();
  80
  81     M_REGIONDATA->m_region = XCreateRegion();
  82     XUnionRectWithRegion( &rect, M_REGIONDATA->m_region, M_REGIONDATA->m_region );
  83 }
  84
  85 wxRegion::wxRegion( size_t n, const wxPoint *points, int fillStyle )
  86 {
  87 #if 0
  88     XPoint *xpoints = new XPoint[n];
  89     for ( size_t i = 0 ; i < n ; i++ )
  90     {
  91         xpoints[i].x = points[i].x;
  92         xpoints[i].y = points[i].y;
  93     }
  94
  95     m_refData = new wxRegionRefData();
  96
  97     Region* reg = gdk_region_polygon
  98                      (
  99                         gdkpoints,
 100                         n,
 101                         fillStyle == wxWINDING_RULE ? GDK_WINDING_RULE
 102                                                     : GDK_EVEN_ODD_RULE
 103                      );
 104
 105     M_REGIONDATA->m_region = reg;
 106
 107     delete [] xpoints;
 108 #endif
 109 }
 110
 111 wxRegion::~wxRegion()
 112 {
 113     // m_refData unrefed in ~wxObject
 114 }
 115
 116 wxObjectRefData *wxRegion::CreateRefData() const
 117 {
 118     return new wxRegionRefData;
 119 }
 120
 121 wxObjectRefData *wxRegion::CloneRefData(const wxObjectRefData *data) const
 122 {
 123     return new wxRegionRefData(*(wxRegionRefData *)data);
 124 }
 125
 126 // ----------------------------------------------------------------------------
 127 // wxRegion comparison
 128 // ----------------------------------------------------------------------------
 129
 130 bool wxRegion::operator==( const wxRegion& region )
 131 {
 132     if (m_refData == region.m_refData) return TRUE;
 133
 134     if (!m_refData || !region.m_refData) return FALSE;
 135
 136     // compare the regions themselves, not the pointers to ref data!
 137     return XEqualRegion( M_REGIONDATA->m_region,
 138                          M_REGIONDATA_OF(region)->m_region );
 139 }
 140
 141 // ----------------------------------------------------------------------------
 142 // wxRegion operations
 143 // ----------------------------------------------------------------------------
 144
 145 void wxRegion::Clear()
 146 {
 147     UnRef();
 148 }
 149
 150 bool wxRegion::Union( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 151 {
 152     // work around for XUnionRectWithRegion() bug: taking a union with an empty
 153     // rect results in an empty region (at least XFree 3.3.6 and 4.0 have this
 154     // problem)
 155     if ( !width || !height )
 156         return TRUE;
 157
 158     XRectangle rect;
 159     rect.x = x;
 160     rect.y = y;
 161     rect.width = width;
 162     rect.height = height;
 163
 164     if (!m_refData)
 165     {
 166         m_refData = new wxRegionRefData();
 167         M_REGIONDATA->m_region = XCreateRegion();
 168         XUnionRectWithRegion( &rect, M_REGIONDATA->m_region, M_REGIONDATA->m_region );
 169     }
 170     else
 171     {
 172         AllocExclusive();
 173
 174         XUnionRectWithRegion( &rect, M_REGIONDATA->m_region, M_REGIONDATA->m_region );
 175     }
 176
 177     return TRUE;
 178 }
 179
 180 bool wxRegion::Union( const wxRect& rect )
 181 {
 182     return Union( rect.x, rect.y, rect.width, rect.height );
 183 }
 184
 185 bool wxRegion::Union( const wxRegion& region )
 186 {
 187     if (region.IsNull())
 188         return FALSE;
 189
 190     if (!m_refData)
 191     {
 192         m_refData = new wxRegionRefData();
 193         M_REGIONDATA->m_region = XCreateRegion();
 194     }
 195     else
 196     {
 197         AllocExclusive();
 198     }
 199
 200     XUnionRegion( M_REGIONDATA->m_region,
 201                   M_REGIONDATA_OF(region)->m_region,
 202                   M_REGIONDATA->m_region );
 203
 204     return TRUE;
 205 }
 206
 207 bool wxRegion::Intersect( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 208 {
 209     wxRegion reg( x, y, width, height );
 210
 211     return Intersect( reg );
 212 }
 213
 214 bool wxRegion::Intersect( const wxRect& rect )
 215 {
 216     wxRegion reg( rect );
 217
 218     return Intersect( reg );
 219 }
 220
 221 bool wxRegion::Intersect( const wxRegion& region )
 222 {
 223     if (region.IsNull())
 224         return FALSE;
 225
 226     if (!m_refData)
 227     {
 228         m_refData = new wxRegionRefData();
 229         M_REGIONDATA->m_region = XCreateRegion();
 230
 231         // leave here
 232         return TRUE;
 233     }
 234     else
 235     {
 236         AllocExclusive();
 237     }
 238
 239     XIntersectRegion( M_REGIONDATA->m_region,
 240                       M_REGIONDATA_OF(region)->m_region,
 241                       M_REGIONDATA->m_region );
 242
 243     return TRUE;
 244 }
 245
 246 bool wxRegion::Subtract( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 247 {
 248     wxRegion reg( x, y, width, height );
 249     return Subtract( reg );
 250 }
 251
 252 bool wxRegion::Subtract( const wxRect& rect )
 253 {
 254     wxRegion reg( rect );
 255     return Subtract( reg );
 256 }
 257
 258 bool wxRegion::Subtract( const wxRegion& region )
 259 {
 260     if (region.IsNull())
 261         return FALSE;
 262
 263     if (!m_refData)
 264     {
 265         m_refData = new wxRegionRefData();
 266         M_REGIONDATA->m_region = XCreateRegion();
 267     }
 268     else
 269     {
 270         AllocExclusive();
 271     }
 272
 273     XSubtractRegion( M_REGIONDATA->m_region,
 274                      M_REGIONDATA_OF(region)->m_region,
 275                      M_REGIONDATA->m_region );
 276
 277     return TRUE;
 278 }
 279
 280 bool wxRegion::Xor( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 281 {
 282     wxRegion reg( x, y, width, height );
 283     return Xor( reg );
 284 }
 285
 286 bool wxRegion::Xor( const wxRect& rect )
 287 {
 288     wxRegion reg( rect );
 289     return Xor( reg );
 290 }
 291
 292 bool wxRegion::Xor( const wxRegion& region )
 293 {
 294     if (region.IsNull())
 295         return FALSE;
 296
 297     if (!m_refData)
 298     {
 299         m_refData = new wxRegionRefData();
 300         M_REGIONDATA->m_region = XCreateRegion();
 301     }
 302     else
 303     {
 304         AllocExclusive();
 305     }
 306
 307     XXorRegion( M_REGIONDATA->m_region,
 308                 M_REGIONDATA_OF(region)->m_region,
 309                 M_REGIONDATA->m_region );
 310
 311     return TRUE;
 312 }
 313
 314 // ----------------------------------------------------------------------------
 315 // wxRegion tests
 316 // ----------------------------------------------------------------------------
 317
 318 void wxRegion::GetBox( wxCoord &x, wxCoord &y, wxCoord &w, wxCoord &h ) const
 319 {
 320     if (m_refData)
 321     {
 322         XRectangle rect;
 323         XClipBox( M_REGIONDATA->m_region, &rect );
 324         x = rect.x;
 325         y = rect.y;
 326         w = rect.width;
 327         h = rect.height;
 328     }
 329     else
 330     {
 331         x = 0;
 332         y = 0;
 333         w = -1;
 334         h = -1;
 335     }
 336 }
 337
 338 wxRect wxRegion::GetBox() const
 339 {
 340     wxCoord x, y, w, h;
 341     GetBox( x, y, w, h );
 342     return wxRect( x, y, w, h );
 343 }
 344
 345 bool wxRegion::Offset( wxCoord x, wxCoord y )
 346 {
 347     if (!m_refData)
 348         return FALSE;
 349
 350     AllocExclusive();
 351
 352     XOffsetRegion( M_REGIONDATA->m_region, x, y );
 353
 354     return TRUE;
 355 }
 356
 357 bool wxRegion::Empty() const
 358 {
 359     if (!m_refData)
 360         return TRUE;
 361
 362     return XEmptyRegion( M_REGIONDATA->m_region );
 363 }
 364
 365 wxRegionContain wxRegion::Contains( wxCoord x, wxCoord y ) const
 366 {
 367     if (!m_refData)
 368         return wxOutRegion;
 369
 370     if (XPointInRegion( M_REGIONDATA->m_region, x, y ))
 371         return wxInRegion;
 372     else
 373         return wxOutRegion;
 374 }
 375
 376 wxRegionContain wxRegion::Contains( wxCoord x, wxCoord y, wxCoord w, wxCoord h ) const
 377 {
 378     if (!m_refData)
 379         return wxOutRegion;
 380
 381     int res = XRectInRegion( M_REGIONDATA->m_region, x, y, w, h );
 382     switch (res)
 383     {
 384         case RectangleIn:   return wxInRegion;
 385         case RectangleOut:  return wxOutRegion;
 386         case RectanglePart: return wxPartRegion;
 387     }
 388     return wxOutRegion;
 389 }
 390
 391 wxRegionContain wxRegion::Contains(const wxPoint& pt) const
 392 {
 393     return Contains( pt.x, pt.y );
 394 }
 395
 396 wxRegionContain wxRegion::Contains(const wxRect& rect) const
 397 {
 398     return Contains( rect.x, rect.y, rect.width, rect.height );
 399 }
 400
 401 WXRegion *wxRegion::GetX11Region() const
 402 {
 403     if (!m_refData)
 404         return (WXRegion*) NULL;
 405
 406     return (WXRegion*) M_REGIONDATA->m_region;
 407 }
 408
 409 // ----------------------------------------------------------------------------
 410 // wxRegionIterator
 411 // ----------------------------------------------------------------------------
 412
 413 // the following structures must match the private structures
 414 // in X11 region code ( xc/lib/X11/region.h )
 415
 416 // this makes the Region type transparent
 417 // and we have access to the region rectangles
 418
 419 struct _XBox {
 420     short x1, x2, y1, y2;
 421 };
 422
 423 struct _XRegion {
 424     long   size , numRects;
 425     _XBox *rects, extents;
 426 };
 427
 428 class wxRIRefData: public wxObjectRefData
 429 {
 430 public:
 431
 432     wxRIRefData() : m_rects(0), m_numRects(0){}
 433    ~wxRIRefData();
 434
 435     wxRect *m_rects;
 436     size_t  m_numRects;
 437
 438     void CreateRects( const wxRegion& r );
 439 };
 440
 441 wxRIRefData::~wxRIRefData()
 442 {
 443     delete [] m_rects;
 444 }
 445
 446 void wxRIRefData::CreateRects( const wxRegion& region )
 447 {
 448     if (m_rects)
 449       delete [] m_rects;
 450
 451     m_rects = 0;
 452     m_numRects = 0;
 453
 454     if (region.IsEmpty()) return;
 455
 456     Region r = (Region) region.GetX11Region();
 457     if (r)
 458     {
 459 #if wxUSE_NANOX
 460         GR_RECT rect;
 461         GrGetRegionBox(r, & rect);
 462         m_numRects = 1;
 463         m_rects = new wxRect[1];
 464         m_rects[0].x = rect.x;
 465         m_rects[0].y = rect.y;
 466         m_rects[0].width = rect.width;
 467         m_rects[0].height = rect.height;
 468 #else
 469         m_numRects = r->numRects;
 470         if (m_numRects)
 471         {
 472             m_rects = new wxRect[m_numRects];
 473             for (size_t i=0; i < m_numRects; ++i)
 474             {
 475                 _XBox &xr = r->rects[i];
 476                 wxRect &wr = m_rects[i];
 477                 wr.x = xr.x1;
 478                 wr.y = xr.y1;
 479                 wr.width = xr.x2-xr.x1;
 480                 wr.height = xr.y2-xr.y1;
 481             }
 482         }
 483 #endif
 484     }
 485 }
 486
 487 wxRegionIterator::wxRegionIterator()
 488 {
 489     m_refData = new wxRIRefData();
 490     Reset();
 491 }
 492
 493 wxRegionIterator::wxRegionIterator( const wxRegion& region )
 494 {
 495     m_refData = new wxRIRefData();
 496     Reset(region);
 497 }
 498
 499 void wxRegionIterator::Reset( const wxRegion& region )
 500 {
 501     m_region = region;
 502     ((wxRIRefData*)m_refData)->CreateRects(region);
 503     Reset();
 504 }
 505
 506 bool wxRegionIterator::HaveRects() const
 507 {
 508     return m_current < ((wxRIRefData*)m_refData)->m_numRects;
 509 }
 510
 511 wxRegionIterator::operator bool () const
 512 {
 513     return HaveRects();
 514 }
 515
 516 void wxRegionIterator::operator ++ ()
 517 {
 518     if (HaveRects()) ++m_current;
 519 }
 520
 521 void wxRegionIterator::operator ++ (int)
 522 {
 523     if (HaveRects()) ++m_current;
 524 }
 525
 526 wxCoord wxRegionIterator::GetX() const
 527 {
 528     if( !HaveRects() ) return 0;
 529     return ((wxRIRefData*)m_refData)->m_rects[m_current].x;
 530 }
 531
 532 wxCoord wxRegionIterator::GetY() const
 533 {
 534     if( !HaveRects() ) return 0;
 535     return ((wxRIRefData*)m_refData)->m_rects[m_current].y;
 536 }
 537
 538 wxCoord wxRegionIterator::GetW() const
 539 {
 540     if( !HaveRects() ) return -1;
 541     return ((wxRIRefData*)m_refData)->m_rects[m_current].width;
 542 }
 543
 544 wxCoord wxRegionIterator::GetH() const
 545 {
 546     if( !HaveRects() ) return -1;
 547     return ((wxRIRefData*)m_refData)->m_rects[m_current].height;
 548 }
 549
 550 wxRect wxRegionIterator::GetRect() const
 551 {
 552     wxRect r;
 553     if( HaveRects() )
 554         r = ((wxRIRefData*)m_refData)->m_rects[m_current];
 555
 556     return r;
 557 }
 558