src/gtk/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/region.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Modified:    VZ at 05.10.00: use AllocExclusive(), comparison fixed
   6 // Id:          $Id$
   7 // Copyright:   (c) 1998 Robert Roebling
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #include "wx/region.h"
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/log.h"
  26 #endif
  27
  28 #include "wx/gtk/private.h"
  29
  30
  31 // ----------------------------------------------------------------------------
  32 // wxRegionRefData: private class containing the information about the region
  33 // ----------------------------------------------------------------------------
  34
  35 class wxRegionRefData : public wxGDIRefData
  36 {
  37 public:
  38     wxRegionRefData()
  39     {
  40         m_region = NULL;
  41     }
  42
  43     wxRegionRefData(const wxRegionRefData& refData)
  44         : wxGDIRefData()
  45     {
  46         m_region = gdk_region_copy(refData.m_region);
  47     }
  48
  49     virtual ~wxRegionRefData()
  50     {
  51         if (m_region)
  52             gdk_region_destroy( m_region );
  53     }
  54
  55     GdkRegion  *m_region;
  56 };
  57
  58 // ----------------------------------------------------------------------------
  59 // macros
  60 // ----------------------------------------------------------------------------
  61
  62 #define M_REGIONDATA ((wxRegionRefData *)m_refData)
  63 #define M_REGIONDATA_OF(rgn) ((wxRegionRefData *)(rgn.m_refData))
  64
  65 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  66 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator,wxObject)
  67
  68 // ----------------------------------------------------------------------------
  69 // wxRegion construction
  70 // ----------------------------------------------------------------------------
  71
  72 #define M_REGIONDATA ((wxRegionRefData *)m_refData)
  73
  74 void wxRegion::InitRect(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
  75 {
  76     GdkRectangle rect;
  77     rect.x = x;
  78     rect.y = y;
  79     rect.width = w;
  80     rect.height = h;
  81
  82     m_refData = new wxRegionRefData();
  83
  84     M_REGIONDATA->m_region = gdk_region_rectangle( &rect );
  85 }
  86
  87 wxRegion::wxRegion( GdkRegion *region )
  88 {
  89     m_refData = new wxRegionRefData();
  90     M_REGIONDATA->m_region = gdk_region_copy( region );
  91 }
  92
  93 wxRegion::wxRegion( size_t n, const wxPoint *points,
  94                     wxPolygonFillMode fillStyle )
  95 {
  96     GdkPoint *gdkpoints = new GdkPoint[n];
  97     for ( size_t i = 0 ; i < n ; i++ )
  98     {
  99         gdkpoints[i].x = points[i].x;
 100         gdkpoints[i].y = points[i].y;
 101     }
 102
 103     m_refData = new wxRegionRefData();
 104
 105     GdkRegion* reg = gdk_region_polygon
 106                      (
 107                         gdkpoints,
 108                         n,
 109                         fillStyle == wxWINDING_RULE ? GDK_WINDING_RULE
 110                                                     : GDK_EVEN_ODD_RULE
 111                      );
 112
 113     M_REGIONDATA->m_region = reg;
 114
 115     delete [] gdkpoints;
 116 }
 117
 118 wxRegion::~wxRegion()
 119 {
 120     // m_refData unrefed in ~wxObject
 121 }
 122
 123 wxGDIRefData *wxRegion::CreateGDIRefData() const
 124 {
 125     return new wxRegionRefData;
 126 }
 127
 128 wxGDIRefData *wxRegion::CloneGDIRefData(const wxGDIRefData *data) const
 129 {
 130     return new wxRegionRefData(*(wxRegionRefData *)data);
 131 }
 132
 133 // ----------------------------------------------------------------------------
 134 // wxRegion comparison
 135 // ----------------------------------------------------------------------------
 136
 137 bool wxRegion::DoIsEqual(const wxRegion& region) const
 138 {
 139     return gdk_region_equal(M_REGIONDATA->m_region,
 140                             M_REGIONDATA_OF(region)->m_region);
 141 }
 142
 143 // ----------------------------------------------------------------------------
 144 // wxRegion operations
 145 // ----------------------------------------------------------------------------
 146
 147 void wxRegion::Clear()
 148 {
 149     UnRef();
 150 }
 151
 152 bool wxRegion::DoUnionWithRect(const wxRect& r)
 153 {
 154     // workaround for a strange GTK/X11 bug: taking union with an empty
 155     // rectangle results in an empty region which is definitely not what we
 156     // want
 157     if ( r.IsEmpty() )
 158         return true;
 159
 160     if ( !m_refData )
 161     {
 162         InitRect(r.x, r.y, r.width, r.height);
 163     }
 164     else
 165     {
 166         AllocExclusive();
 167
 168         GdkRectangle rect;
 169         rect.x = r.x;
 170         rect.y = r.y;
 171         rect.width = r.width;
 172         rect.height = r.height;
 173
 174         gdk_region_union_with_rect( M_REGIONDATA->m_region, &rect );
 175     }
 176
 177     return true;
 178 }
 179
 180 bool wxRegion::DoUnionWithRegion( const wxRegion& region )
 181 {
 182     wxCHECK_MSG( region.IsOk(), false, wxT("invalid region") );
 183
 184     if (!m_refData)
 185     {
 186         m_refData = new wxRegionRefData(*M_REGIONDATA_OF(region));
 187     }
 188     else
 189     {
 190         AllocExclusive();
 191         gdk_region_union( M_REGIONDATA->m_region, region.GetRegion() );
 192     }
 193
 194     return true;
 195 }
 196
 197 bool wxRegion::DoIntersect( const wxRegion& region )
 198 {
 199     wxCHECK_MSG( region.IsOk(), false, wxT("invalid region") );
 200
 201     if (!m_refData)
 202     {
 203         // intersecting with invalid region doesn't make sense
 204         return false;
 205     }
 206
 207     AllocExclusive();
 208
 209     gdk_region_intersect( M_REGIONDATA->m_region, region.GetRegion() );
 210
 211     return true;
 212 }
 213
 214 bool wxRegion::DoSubtract( const wxRegion& region )
 215 {
 216     wxCHECK_MSG( region.IsOk(), false, wxT("invalid region") );
 217
 218     if (!m_refData)
 219     {
 220         // subtracting from an invalid region doesn't make sense
 221         return false;
 222     }
 223
 224     AllocExclusive();
 225
 226     gdk_region_subtract( M_REGIONDATA->m_region, region.GetRegion() );
 227
 228     return true;
 229 }
 230
 231 bool wxRegion::DoXor( const wxRegion& region )
 232 {
 233     wxCHECK_MSG( region.IsOk(), false, wxT("invalid region") );
 234
 235     if (!m_refData)
 236     {
 237         // XOR-ing with an invalid region is the same as XOR-ing with an empty
 238         // one, i.e. it is simply a copy.
 239         m_refData = new wxRegionRefData(*M_REGIONDATA_OF(region));
 240     }
 241     else
 242     {
 243         AllocExclusive();
 244
 245         gdk_region_xor( M_REGIONDATA->m_region, region.GetRegion() );
 246     }
 247
 248     return true;
 249 }
 250
 251 bool wxRegion::DoOffset( wxCoord x, wxCoord y )
 252 {
 253     wxCHECK_MSG( m_refData, false, wxS("invalid region") );
 254
 255     AllocExclusive();
 256
 257     gdk_region_offset( M_REGIONDATA->m_region, x, y );
 258
 259     return true;
 260 }
 261
 262 // ----------------------------------------------------------------------------
 263 // wxRegion tests
 264 // ----------------------------------------------------------------------------
 265
 266 bool wxRegion::DoGetBox( wxCoord &x, wxCoord &y, wxCoord &w, wxCoord &h ) const
 267 {
 268     if ( m_refData )
 269     {
 270         GdkRectangle rect;
 271         gdk_region_get_clipbox( M_REGIONDATA->m_region, &rect );
 272         x = rect.x;
 273         y = rect.y;
 274         w = rect.width;
 275         h = rect.height;
 276
 277         return true;
 278     }
 279     else
 280     {
 281         x = 0;
 282         y = 0;
 283         w = -1;
 284         h = -1;
 285
 286         return false;
 287     }
 288 }
 289
 290 bool wxRegion::IsEmpty() const
 291 {
 292     if (!m_refData)
 293         return true;
 294
 295     return gdk_region_empty( M_REGIONDATA->m_region );
 296 }
 297
 298 wxRegionContain wxRegion::DoContainsPoint( wxCoord x, wxCoord y ) const
 299 {
 300     if (!m_refData)
 301         return wxOutRegion;
 302
 303     if (gdk_region_point_in( M_REGIONDATA->m_region, x, y ))
 304         return wxInRegion;
 305     else
 306         return wxOutRegion;
 307 }
 308
 309 wxRegionContain wxRegion::DoContainsRect(const wxRect& r) const
 310 {
 311     if (!m_refData)
 312         return wxOutRegion;
 313
 314     GdkRectangle rect;
 315     rect.x = r.x;
 316     rect.y = r.y;
 317     rect.width = r.width;
 318     rect.height = r.height;
 319     GdkOverlapType res = gdk_region_rect_in( M_REGIONDATA->m_region, &rect );
 320     switch (res)
 321     {
 322         case GDK_OVERLAP_RECTANGLE_IN:   return wxInRegion;
 323         case GDK_OVERLAP_RECTANGLE_OUT:  return wxOutRegion;
 324         case GDK_OVERLAP_RECTANGLE_PART: return wxPartRegion;
 325     }
 326     return wxOutRegion;
 327 }
 328
 329 GdkRegion *wxRegion::GetRegion() const
 330 {
 331     if (!m_refData)
 332         return NULL;
 333
 334     return M_REGIONDATA->m_region;
 335 }
 336
 337 // ----------------------------------------------------------------------------
 338 // wxRegionIterator
 339 // ----------------------------------------------------------------------------
 340
 341 wxRegionIterator::wxRegionIterator()
 342 {
 343     Init();
 344     Reset();
 345 }
 346
 347 wxRegionIterator::wxRegionIterator( const wxRegion& region )
 348 {
 349     Init();
 350     Reset(region);
 351 }
 352
 353 void wxRegionIterator::Init()
 354 {
 355     m_rects = NULL;
 356     m_numRects = 0;
 357 }
 358
 359 wxRegionIterator::~wxRegionIterator()
 360 {
 361     wxDELETEA(m_rects);
 362 }
 363
 364 void wxRegionIterator::CreateRects( const wxRegion& region )
 365 {
 366     wxDELETEA(m_rects);
 367     m_numRects = 0;
 368
 369     GdkRegion *gdkregion = region.GetRegion();
 370     if (!gdkregion)
 371         return;
 372
 373     GdkRectangle* gdkrects;
 374     gdk_region_get_rectangles(gdkregion, &gdkrects, &m_numRects);
 375
 376     if (m_numRects)
 377     {
 378         m_rects = new wxRect[m_numRects];
 379         for (int i = 0; i < m_numRects; ++i)
 380         {
 381             GdkRectangle &gr = gdkrects[i];
 382             wxRect &wr = m_rects[i];
 383             wr.x = gr.x;
 384             wr.y = gr.y;
 385             wr.width = gr.width;
 386             wr.height = gr.height;
 387         }
 388     }
 389     g_free( gdkrects );
 390 }
 391
 392 void wxRegionIterator::Reset( const wxRegion& region )
 393 {
 394     m_region = region;
 395     CreateRects(region);
 396     Reset();
 397 }
 398
 399 bool wxRegionIterator::HaveRects() const
 400 {
 401     return m_current < m_numRects;
 402 }
 403
 404 wxRegionIterator& wxRegionIterator::operator ++ ()
 405 {
 406     if (HaveRects())
 407         ++m_current;
 408
 409     return *this;
 410 }
 411
 412 wxRegionIterator wxRegionIterator::operator ++ (int)
 413 {
 414     wxRegionIterator tmp = *this;
 415
 416     if (HaveRects())
 417         ++m_current;
 418
 419     return tmp;
 420 }
 421
 422 wxCoord wxRegionIterator::GetX() const
 423 {
 424     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 425
 426     return m_rects[m_current].x;
 427 }
 428
 429 wxCoord wxRegionIterator::GetY() const
 430 {
 431     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 432
 433     return m_rects[m_current].y;
 434 }
 435
 436 wxCoord wxRegionIterator::GetW() const
 437 {
 438     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 439
 440     return m_rects[m_current].width;
 441 }
 442
 443 wxCoord wxRegionIterator::GetH() const
 444 {
 445     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 446
 447     return m_rects[m_current].height;
 448 }
 449
 450 wxRect wxRegionIterator::GetRect() const
 451 {
 452     wxRect r;
 453     if( HaveRects() )
 454         r = m_rects[m_current];
 455
 456     return r;
 457 }
 458
 459 wxRegionIterator& wxRegionIterator::operator=(const wxRegionIterator& ri)
 460 {
 461     if (this != &ri)
 462     {
 463         wxDELETEA(m_rects);
 464
 465         m_current = ri.m_current;
 466         m_numRects = ri.m_numRects;
 467         if ( m_numRects )
 468         {
 469             m_rects = new wxRect[m_numRects];
 470             memcpy(m_rects, ri.m_rects, m_numRects * sizeof m_rects[0]);
 471         }
 472     }
 473     return *this;
 474 }