src/gtk1/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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/gtk1/private.h"
  29
  30
  31 // ----------------------------------------------------------------------------
  32 // wxGdkRegion: creates a new region in ctor and destroys in dtor
  33 // ----------------------------------------------------------------------------
  34
  35 class wxGdkRegion
  36 {
  37 public:
  38     wxGdkRegion() { m_region = gdk_region_new(); }
  39     ~wxGdkRegion() { gdk_region_destroy(m_region); }
  40
  41     operator GdkRegion *() const { return m_region; }
  42
  43 private:
  44     GdkRegion *m_region;
  45 };
  46
  47
  48 // ----------------------------------------------------------------------------
  49 // wxRegionRefData: private class containing the information about the region
  50 // ----------------------------------------------------------------------------
  51
  52 class wxRegionRefData : public wxObjectRefData
  53 {
  54 public:
  55     wxRegionRefData()
  56     {
  57         m_region = NULL;
  58     }
  59
  60     wxRegionRefData(const wxRegionRefData& refData)
  61         : wxObjectRefData()
  62     {
  63         m_region = gdk_regions_union(wxGdkRegion(), refData.m_region);
  64     }
  65
  66     virtual ~wxRegionRefData()
  67     {
  68         if (m_region)
  69             gdk_region_destroy( m_region );
  70     }
  71
  72     GdkRegion  *m_region;
  73 };
  74
  75 // ----------------------------------------------------------------------------
  76 // macros
  77 // ----------------------------------------------------------------------------
  78
  79 #define M_REGIONDATA ((wxRegionRefData *)m_refData)
  80 #define M_REGIONDATA_OF(rgn) ((wxRegionRefData *)(rgn.m_refData))
  81
  82 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  83 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator,wxObject)
  84
  85 // ----------------------------------------------------------------------------
  86 // wxRegion construction
  87 // ----------------------------------------------------------------------------
  88
  89 #define M_REGIONDATA ((wxRegionRefData *)m_refData)
  90
  91 void wxRegion::InitRect(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
  92 {
  93     GdkRectangle rect;
  94     rect.x = x;
  95     rect.y = y;
  96     rect.width = w;
  97     rect.height = h;
  98
  99     m_refData = new wxRegionRefData();
 100
 101     M_REGIONDATA->m_region = gdk_region_union_with_rect( wxGdkRegion(), &rect );
 102 }
 103
 104 wxRegion::wxRegion( GdkRegion *region )
 105 {
 106     m_refData = new wxRegionRefData();
 107     M_REGIONDATA->m_region = gdk_regions_union(wxGdkRegion(), region);
 108 }
 109
 110 wxRegion::wxRegion( size_t n, const wxPoint *points, int fillStyle )
 111 {
 112     GdkPoint *gdkpoints = new GdkPoint[n];
 113     for ( size_t i = 0 ; i < n ; i++ )
 114     {
 115         gdkpoints[i].x = points[i].x;
 116         gdkpoints[i].y = points[i].y;
 117     }
 118
 119     m_refData = new wxRegionRefData();
 120
 121     GdkRegion* reg = gdk_region_polygon
 122                      (
 123                         gdkpoints,
 124                         n,
 125                         fillStyle == wxWINDING_RULE ? GDK_WINDING_RULE
 126                                                     : GDK_EVEN_ODD_RULE
 127                      );
 128
 129     M_REGIONDATA->m_region = reg;
 130
 131     delete [] gdkpoints;
 132 }
 133
 134 wxRegion::~wxRegion()
 135 {
 136     // m_refData unrefed in ~wxObject
 137 }
 138
 139 wxObjectRefData *wxRegion::CreateRefData() const
 140 {
 141     return new wxRegionRefData;
 142 }
 143
 144 wxObjectRefData *wxRegion::CloneRefData(const wxObjectRefData *data) const
 145 {
 146     return new wxRegionRefData(*(wxRegionRefData *)data);
 147 }
 148
 149 // ----------------------------------------------------------------------------
 150 // wxRegion comparison
 151 // ----------------------------------------------------------------------------
 152
 153 bool wxRegion::DoIsEqual(const wxRegion& region) const
 154 {
 155     return gdk_region_equal(M_REGIONDATA->m_region,
 156                             M_REGIONDATA_OF(region)->m_region);
 157 }
 158
 159 // ----------------------------------------------------------------------------
 160 // wxRegion operations
 161 // ----------------------------------------------------------------------------
 162
 163 void wxRegion::Clear()
 164 {
 165     UnRef();
 166 }
 167
 168 bool wxRegion::DoUnionWithRect(const wxRect& r)
 169 {
 170     // workaround for a strange GTK/X11 bug: taking union with an empty
 171     // rectangle results in an empty region which is definitely not what we
 172     // want
 173     if ( r.IsEmpty() )
 174         return TRUE;
 175
 176     if ( !m_refData )
 177     {
 178         InitRect(r.x, r.y, r.width, r.height);
 179     }
 180     else
 181     {
 182         AllocExclusive();
 183
 184         GdkRectangle rect;
 185         rect.x = r.x;
 186         rect.y = r.y;
 187         rect.width = r.width;
 188         rect.height = r.height;
 189
 190         gdk_region_union_with_rect( M_REGIONDATA->m_region, &rect );
 191     }
 192
 193     return TRUE;
 194 }
 195
 196 bool wxRegion::DoUnionWithRegion( const wxRegion& region )
 197 {
 198     if (region.IsNull())
 199         return FALSE;
 200
 201     if (!m_refData)
 202     {
 203         m_refData = new wxRegionRefData();
 204         M_REGIONDATA->m_region = gdk_region_new();
 205     }
 206     else
 207     {
 208         AllocExclusive();
 209     }
 210
 211     GdkRegion *reg = gdk_regions_union( M_REGIONDATA->m_region, region.GetRegion() );
 212     gdk_region_destroy( M_REGIONDATA->m_region );
 213     M_REGIONDATA->m_region = reg;
 214
 215     return TRUE;
 216 }
 217
 218 bool wxRegion::DoIntersect( const wxRegion& region )
 219 {
 220     wxCHECK_MSG( region.Ok(), false, _T("invalid region") );
 221
 222     if (!m_refData)
 223     {
 224         // intersecting with invalid region doesn't make sense
 225         return FALSE;
 226     }
 227
 228     AllocExclusive();
 229
 230     GdkRegion *reg = gdk_regions_intersect( M_REGIONDATA->m_region, region.GetRegion() );
 231     gdk_region_destroy( M_REGIONDATA->m_region );
 232     M_REGIONDATA->m_region = reg;
 233
 234     return TRUE;
 235 }
 236
 237 bool wxRegion::DoSubtract( const wxRegion& region )
 238 {
 239     wxCHECK_MSG( region.Ok(), false, _T("invalid region") );
 240
 241     if (!m_refData)
 242     {
 243         // subtracting from an invalid region doesn't make sense
 244         return FALSE;
 245     }
 246
 247     AllocExclusive();
 248
 249     GdkRegion *reg = gdk_regions_subtract( M_REGIONDATA->m_region, region.GetRegion() );
 250     gdk_region_destroy( M_REGIONDATA->m_region );
 251     M_REGIONDATA->m_region = reg;
 252
 253     return TRUE;
 254 }
 255
 256 bool wxRegion::DoXor( const wxRegion& region )
 257 {
 258     wxCHECK_MSG( region.Ok(), false, _T("invalid region") );
 259
 260     if (!m_refData)
 261     {
 262         return FALSE;
 263     }
 264
 265     AllocExclusive();
 266
 267     GdkRegion *reg = gdk_regions_xor( M_REGIONDATA->m_region, region.GetRegion() );
 268     gdk_region_destroy( M_REGIONDATA->m_region );
 269     M_REGIONDATA->m_region = reg;
 270
 271     return TRUE;
 272 }
 273
 274 bool wxRegion::DoOffset( wxCoord x, wxCoord y )
 275 {
 276     if (!m_refData)
 277         return FALSE;
 278
 279     AllocExclusive();
 280
 281     gdk_region_offset( M_REGIONDATA->m_region, x, y );
 282
 283     return TRUE;
 284 }
 285
 286 // ----------------------------------------------------------------------------
 287 // wxRegion tests
 288 // ----------------------------------------------------------------------------
 289
 290 bool wxRegion::DoGetBox( wxCoord &x, wxCoord &y, wxCoord &w, wxCoord &h ) const
 291 {
 292     if ( m_refData )
 293     {
 294         GdkRectangle rect;
 295         gdk_region_get_clipbox( M_REGIONDATA->m_region, &rect );
 296         x = rect.x;
 297         y = rect.y;
 298         w = rect.width;
 299         h = rect.height;
 300
 301         return true;
 302     }
 303     else
 304     {
 305         x = 0;
 306         y = 0;
 307         w = -1;
 308         h = -1;
 309
 310         return false;
 311     }
 312 }
 313
 314 bool wxRegion::IsEmpty() const
 315 {
 316     if (!m_refData)
 317         return TRUE;
 318
 319     return gdk_region_empty( M_REGIONDATA->m_region );
 320 }
 321
 322 wxRegionContain wxRegion::DoContainsPoint( wxCoord x, wxCoord y ) const
 323 {
 324     if (!m_refData)
 325         return wxOutRegion;
 326
 327     if (gdk_region_point_in( M_REGIONDATA->m_region, x, y ))
 328         return wxInRegion;
 329     else
 330         return wxOutRegion;
 331 }
 332
 333 wxRegionContain wxRegion::DoContainsRect(const wxRect& r) const
 334 {
 335     if (!m_refData)
 336         return wxOutRegion;
 337
 338     GdkRectangle rect;
 339     rect.x = r.x;
 340     rect.y = r.y;
 341     rect.width = r.width;
 342     rect.height = r.height;
 343     GdkOverlapType res = gdk_region_rect_in( M_REGIONDATA->m_region, &rect );
 344     switch (res)
 345     {
 346         case GDK_OVERLAP_RECTANGLE_IN:   return wxInRegion;
 347         case GDK_OVERLAP_RECTANGLE_OUT:  return wxOutRegion;
 348         case GDK_OVERLAP_RECTANGLE_PART: return wxPartRegion;
 349     }
 350     return wxOutRegion;
 351 }
 352
 353 GdkRegion *wxRegion::GetRegion() const
 354 {
 355     if (!m_refData)
 356         return (GdkRegion*) NULL;
 357
 358     return M_REGIONDATA->m_region;
 359 }
 360
 361 // ----------------------------------------------------------------------------
 362 // wxRegionIterator
 363 // ----------------------------------------------------------------------------
 364
 365 // the following structures must match the private structures
 366 // in X11 region code ( xc/lib/X11/region.h )
 367
 368 // this makes the Region type transparent
 369 // and we have access to the region rectangles
 370
 371 #include <gdk/gdkprivate.h>
 372
 373 struct _XBox {
 374     short x1, x2, y1, y2;
 375 };
 376
 377 struct _XRegion {
 378     long   size , numRects;
 379     _XBox *rects, extents;
 380 };
 381
 382
 383 class wxRIRefData: public wxObjectRefData
 384 {
 385 public:
 386     wxRIRefData() { Init(); }
 387     virtual ~wxRIRefData();
 388
 389     void CreateRects( const wxRegion& r );
 390
 391     void Init() { m_rects = NULL; m_numRects = 0; }
 392
 393     wxRect *m_rects;
 394     size_t  m_numRects;
 395 };
 396
 397 wxRIRefData::~wxRIRefData()
 398 {
 399     delete [] m_rects;
 400 }
 401
 402 void wxRIRefData::CreateRects( const wxRegion& region )
 403 {
 404     delete [] m_rects;
 405
 406     Init();
 407
 408     GdkRegion *gdkregion = region.GetRegion();
 409     if (!gdkregion)
 410         return;
 411
 412     Region r = ((GdkRegionPrivate *)gdkregion)->xregion;
 413     if (r)
 414     {
 415         m_numRects = r->numRects;
 416         if (m_numRects)
 417         {
 418             m_rects = new wxRect[m_numRects];
 419             for (size_t i=0; i < m_numRects; ++i)
 420             {
 421                 _XBox &xr = r->rects[i];
 422                 wxRect &wr = m_rects[i];
 423                 wr.x = xr.x1;
 424                 wr.y = xr.y1;
 425                 wr.width = xr.x2-xr.x1;
 426                 wr.height = xr.y2-xr.y1;
 427             }
 428         }
 429     }
 430 }
 431
 432 wxRegionIterator::wxRegionIterator()
 433 {
 434     m_refData = new wxRIRefData();
 435     Reset();
 436 }
 437
 438 wxRegionIterator::wxRegionIterator( const wxRegion& region )
 439 {
 440     m_refData = new wxRIRefData();
 441     Reset(region);
 442 }
 443
 444 void wxRegionIterator::Reset( const wxRegion& region )
 445 {
 446     m_region = region;
 447     ((wxRIRefData*)m_refData)->CreateRects(region);
 448     Reset();
 449 }
 450
 451 bool wxRegionIterator::HaveRects() const
 452 {
 453     return m_current < ((wxRIRefData*)m_refData)->m_numRects;
 454 }
 455
 456 wxRegionIterator& wxRegionIterator::operator ++ ()
 457 {
 458     if (HaveRects())
 459         ++m_current;
 460
 461     return *this;
 462 }
 463
 464 wxRegionIterator wxRegionIterator::operator ++ (int)
 465 {
 466     wxRegionIterator tmp = *this;
 467     if (HaveRects())
 468         ++m_current;
 469
 470     return tmp;
 471 }
 472
 473 wxCoord wxRegionIterator::GetX() const
 474 {
 475     wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
 476
 477     return ((wxRIRefData*)m_refData)->m_rects[m_current].x;
 478 }
 479
 480 wxCoord wxRegionIterator::GetY() const
 481 {
 482     wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
 483
 484     return ((wxRIRefData*)m_refData)->m_rects[m_current].y;
 485 }
 486
 487 wxCoord wxRegionIterator::GetW() const
 488 {
 489     wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
 490
 491     return ((wxRIRefData*)m_refData)->m_rects[m_current].width;
 492 }
 493
 494 wxCoord wxRegionIterator::GetH() const
 495 {
 496     wxCHECK_MSG( HaveRects(), 0, _T("invalid wxRegionIterator") );
 497
 498     return ((wxRIRefData*)m_refData)->m_rects[m_current].height;
 499 }
 500
 501 wxRect wxRegionIterator::GetRect() const
 502 {
 503     wxRect r;
 504     if( HaveRects() )
 505         r = ((wxRIRefData*)m_refData)->m_rects[m_current];
 506
 507     return r;
 508 }