src/x11/region.cpp

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