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.Ok(), false, wxT("invalid region") );
 183
 184     if (!m_refData)
 185     {
 186         m_refData = new wxRegionRefData();
 187         M_REGIONDATA->m_region = gdk_region_new();
 188     }
 189     else
 190     {
 191         AllocExclusive();
 192     }
 193
 194     gdk_region_union( M_REGIONDATA->m_region, region.GetRegion() );
 195
 196     return true;
 197 }
 198
 199 bool wxRegion::DoIntersect( const wxRegion& region )
 200 {
 201     wxCHECK_MSG( region.Ok(), false, wxT("invalid region") );
 202
 203     if (!m_refData)
 204     {
 205         // intersecting with invalid region doesn't make sense
 206         return false;
 207     }
 208
 209     AllocExclusive();
 210
 211     gdk_region_intersect( M_REGIONDATA->m_region, region.GetRegion() );
 212
 213     return true;
 214 }
 215
 216 bool wxRegion::DoSubtract( const wxRegion& region )
 217 {
 218     wxCHECK_MSG( region.Ok(), false, wxT("invalid region") );
 219
 220     if (!m_refData)
 221     {
 222         // subtracting from an invalid region doesn't make sense
 223         return false;
 224     }
 225
 226     AllocExclusive();
 227
 228     gdk_region_subtract( M_REGIONDATA->m_region, region.GetRegion() );
 229
 230     return true;
 231 }
 232
 233 bool wxRegion::DoXor( const wxRegion& region )
 234 {
 235     wxCHECK_MSG( region.Ok(), false, wxT("invalid region") );
 236
 237     if (!m_refData)
 238     {
 239         return false;
 240     }
 241
 242     AllocExclusive();
 243
 244     gdk_region_xor( M_REGIONDATA->m_region, region.GetRegion() );
 245
 246     return true;
 247 }
 248
 249 bool wxRegion::DoOffset( wxCoord x, wxCoord y )
 250 {
 251     if (!m_refData)
 252         return false;
 253
 254     AllocExclusive();
 255
 256     gdk_region_offset( M_REGIONDATA->m_region, x, y );
 257
 258     return true;
 259 }
 260
 261 // ----------------------------------------------------------------------------
 262 // wxRegion tests
 263 // ----------------------------------------------------------------------------
 264
 265 bool wxRegion::DoGetBox( wxCoord &x, wxCoord &y, wxCoord &w, wxCoord &h ) const
 266 {
 267     if ( m_refData )
 268     {
 269         GdkRectangle rect;
 270         gdk_region_get_clipbox( M_REGIONDATA->m_region, &rect );
 271         x = rect.x;
 272         y = rect.y;
 273         w = rect.width;
 274         h = rect.height;
 275
 276         return true;
 277     }
 278     else
 279     {
 280         x = 0;
 281         y = 0;
 282         w = -1;
 283         h = -1;
 284
 285         return false;
 286     }
 287 }
 288
 289 bool wxRegion::IsEmpty() const
 290 {
 291     if (!m_refData)
 292         return true;
 293
 294     return gdk_region_empty( M_REGIONDATA->m_region );
 295 }
 296
 297 wxRegionContain wxRegion::DoContainsPoint( wxCoord x, wxCoord y ) const
 298 {
 299     if (!m_refData)
 300         return wxOutRegion;
 301
 302     if (gdk_region_point_in( M_REGIONDATA->m_region, x, y ))
 303         return wxInRegion;
 304     else
 305         return wxOutRegion;
 306 }
 307
 308 wxRegionContain wxRegion::DoContainsRect(const wxRect& r) const
 309 {
 310     if (!m_refData)
 311         return wxOutRegion;
 312
 313     GdkRectangle rect;
 314     rect.x = r.x;
 315     rect.y = r.y;
 316     rect.width = r.width;
 317     rect.height = r.height;
 318     GdkOverlapType res = gdk_region_rect_in( M_REGIONDATA->m_region, &rect );
 319     switch (res)
 320     {
 321         case GDK_OVERLAP_RECTANGLE_IN:   return wxInRegion;
 322         case GDK_OVERLAP_RECTANGLE_OUT:  return wxOutRegion;
 323         case GDK_OVERLAP_RECTANGLE_PART: return wxPartRegion;
 324     }
 325     return wxOutRegion;
 326 }
 327
 328 GdkRegion *wxRegion::GetRegion() const
 329 {
 330     if (!m_refData)
 331         return NULL;
 332
 333     return M_REGIONDATA->m_region;
 334 }
 335
 336 // ----------------------------------------------------------------------------
 337 // wxRegionIterator
 338 // ----------------------------------------------------------------------------
 339
 340 wxRegionIterator::wxRegionIterator()
 341 {
 342     Init();
 343     Reset();
 344 }
 345
 346 wxRegionIterator::wxRegionIterator( const wxRegion& region )
 347 {
 348     Init();
 349     Reset(region);
 350 }
 351
 352 void wxRegionIterator::Init()
 353 {
 354     m_rects = NULL;
 355     m_numRects = 0;
 356 }
 357
 358 wxRegionIterator::~wxRegionIterator()
 359 {
 360     wxDELETEA(m_rects);
 361 }
 362
 363 void wxRegionIterator::CreateRects( const wxRegion& region )
 364 {
 365     wxDELETEA(m_rects);
 366     m_numRects = 0;
 367
 368     GdkRegion *gdkregion = region.GetRegion();
 369     if (!gdkregion)
 370         return;
 371
 372     GdkRectangle *gdkrects = NULL;
 373     gint numRects = 0;
 374     gdk_region_get_rectangles( gdkregion, &gdkrects, &numRects );
 375
 376     m_numRects = numRects;
 377     if (numRects)
 378     {
 379         m_rects = new wxRect[m_numRects];
 380         for (size_t i=0; i < m_numRects; ++i)
 381         {
 382             GdkRectangle &gr = gdkrects[i];
 383             wxRect &wr = m_rects[i];
 384             wr.x = gr.x;
 385             wr.y = gr.y;
 386             wr.width = gr.width;
 387             wr.height = gr.height;
 388         }
 389     }
 390     g_free( gdkrects );
 391 }
 392
 393 void wxRegionIterator::Reset( const wxRegion& region )
 394 {
 395     m_region = region;
 396     CreateRects(region);
 397     Reset();
 398 }
 399
 400 bool wxRegionIterator::HaveRects() const
 401 {
 402     return m_current < m_numRects;
 403 }
 404
 405 wxRegionIterator& wxRegionIterator::operator ++ ()
 406 {
 407     if (HaveRects())
 408         ++m_current;
 409
 410     return *this;
 411 }
 412
 413 wxRegionIterator wxRegionIterator::operator ++ (int)
 414 {
 415     wxRegionIterator tmp = *this;
 416
 417     if (HaveRects())
 418         ++m_current;
 419
 420     return tmp;
 421 }
 422
 423 wxCoord wxRegionIterator::GetX() const
 424 {
 425     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 426
 427     return m_rects[m_current].x;
 428 }
 429
 430 wxCoord wxRegionIterator::GetY() const
 431 {
 432     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 433
 434     return m_rects[m_current].y;
 435 }
 436
 437 wxCoord wxRegionIterator::GetW() const
 438 {
 439     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 440
 441     return m_rects[m_current].width;
 442 }
 443
 444 wxCoord wxRegionIterator::GetH() const
 445 {
 446     wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
 447
 448     return m_rects[m_current].height;
 449 }
 450
 451 wxRect wxRegionIterator::GetRect() const
 452 {
 453     wxRect r;
 454     if( HaveRects() )
 455         r = m_rects[m_current];
 456
 457     return r;
 458 }
 459
 460 wxRegionIterator& wxRegionIterator::operator=(const wxRegionIterator& ri)
 461 {
 462     wxDELETEA(m_rects);
 463
 464     m_current = ri.m_current;
 465     m_numRects = ri.m_numRects;
 466     if ( m_numRects )
 467     {
 468         m_rects = new wxRect[m_numRects];
 469         for ( unsigned int n = 0; n < m_numRects; n++ )
 470             m_rects[n] = ri.m_rects[n];
 471     }
 472     else
 473     {
 474         m_rects = NULL;
 475     }
 476
 477     return *this;
 478 }