src/msw/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:      msw/region.cpp
   3 // Purpose:   wxRegion implementation using Win32 API
   4 // Author:    Vadim Zeitlin
   5 // Modified by:
   6 // Created:   Fri Oct 24 10:46:34 MET 1997
   7 // RCS-ID:    $Id$
   8 // Copyright: (c) 1997-2002 wxWidgets team
   9 // Licence:   wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "region.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28 #pragma hdrstop
  29 #endif
  30
  31 #include "wx/region.h"
  32 #include "wx/gdicmn.h"
  33
  34 #include "wx/msw/private.h"
  35
  36 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  37 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
  38
  39 // ----------------------------------------------------------------------------
  40 // wxRegionRefData implementation
  41 // ----------------------------------------------------------------------------
  42
  43 class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
  44 {
  45 public:
  46     wxRegionRefData()
  47     {
  48         m_region = 0;
  49     }
  50
  51     wxRegionRefData(const wxRegionRefData& data)
  52     {
  53 #if defined(__WIN32__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
  54         DWORD noBytes = ::GetRegionData(data.m_region, 0, NULL);
  55         RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
  56         ::GetRegionData(data.m_region, noBytes, rgnData);
  57         m_region = ::ExtCreateRegion(NULL, noBytes, rgnData);
  58         delete[] (char*) rgnData;
  59 #else
  60         RECT rect;
  61         ::GetRgnBox(data.m_region, &rect);
  62         m_region = ::CreateRectRgnIndirect(&rect);
  63 #endif
  64     }
  65
  66     virtual ~wxRegionRefData()
  67     {
  68         ::DeleteObject(m_region);
  69         m_region = 0;
  70     }
  71
  72     HRGN m_region;
  73
  74 private:
  75 // Cannot use
  76 //  DECLARE_NO_COPY_CLASS(wxRegionRefData)
  77 // because copy constructor is explicitly declared above;
  78 // but no copy assignment operator is defined, so declare
  79 // it private to prevent the compiler from defining it:
  80     wxRegionRefData& operator=(const wxRegionRefData&);
  81 };
  82
  83 #define M_REGION (((wxRegionRefData*)m_refData)->m_region)
  84 #define M_REGION_OF(rgn) (((wxRegionRefData*)(rgn.m_refData))->m_region)
  85
  86 // ============================================================================
  87 // wxRegion implementation
  88 // ============================================================================
  89
  90 // ----------------------------------------------------------------------------
  91 // ctors and dtor
  92 // ----------------------------------------------------------------------------
  93
  94 wxRegion::wxRegion()
  95 {
  96     m_refData = (wxRegionRefData *)NULL;
  97 }
  98
  99 wxRegion::wxRegion(WXHRGN hRegion)
 100 {
 101     m_refData = new wxRegionRefData;
 102     M_REGION = (HRGN) hRegion;
 103 }
 104
 105 wxRegion::wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 106 {
 107     m_refData = new wxRegionRefData;
 108     M_REGION = ::CreateRectRgn(x, y, x + w, y + h);
 109 }
 110
 111 wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
 112 {
 113     m_refData = new wxRegionRefData;
 114     M_REGION = ::CreateRectRgn(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
 115 }
 116
 117 wxRegion::wxRegion(const wxRect& rect)
 118 {
 119     m_refData = new wxRegionRefData;
 120     M_REGION = ::CreateRectRgn(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
 121 }
 122
 123 wxRegion::wxRegion(size_t n, const wxPoint *points, int fillStyle)
 124 {
 125 #if defined(__WXMICROWIN__) || defined(__WXWINCE__)
 126     m_refData = NULL;
 127     M_REGION = NULL;
 128 #else
 129     m_refData = new wxRegionRefData;
 130     M_REGION = ::CreatePolygonRgn
 131                (
 132                     (POINT*)points,
 133                     n,
 134                     fillStyle == wxODDEVEN_RULE ? ALTERNATE : WINDING
 135                );
 136 #endif
 137 }
 138
 139 wxRegion::~wxRegion()
 140 {
 141     // m_refData unrefed in ~wxObject
 142 }
 143
 144 wxObjectRefData *wxRegion::CreateRefData() const
 145 {
 146     return new wxRegionRefData;
 147 }
 148
 149 wxObjectRefData *wxRegion::CloneRefData(const wxObjectRefData *data) const
 150 {
 151     return new wxRegionRefData(*(wxRegionRefData *)data);
 152 }
 153
 154 // ----------------------------------------------------------------------------
 155 // wxRegion operations
 156 // ----------------------------------------------------------------------------
 157
 158 // Clear current region
 159 void wxRegion::Clear()
 160 {
 161     UnRef();
 162 }
 163
 164 bool wxRegion::Offset(wxCoord x, wxCoord y)
 165 {
 166     wxCHECK_MSG( M_REGION, FALSE, _T("invalid wxRegion") );
 167
 168     if ( !x && !y )
 169     {
 170         // nothing to do
 171         return TRUE;
 172     }
 173
 174     AllocExclusive();
 175
 176     if ( ::OffsetRgn(GetHrgn(), x, y) == ERROR )
 177     {
 178         wxLogLastError(_T("OffsetRgn"));
 179
 180         return FALSE;
 181     }
 182
 183     return TRUE;
 184 }
 185
 186 // combine another region with this one
 187 bool wxRegion::Combine(const wxRegion& rgn, wxRegionOp op)
 188 {
 189     // we can't use the API functions if we don't have a valid region handle
 190     if ( !m_refData )
 191     {
 192         // combining with an empty/invalid region works differently depending
 193         // on the operation
 194         switch ( op )
 195         {
 196             case wxRGN_COPY:
 197             case wxRGN_OR:
 198             case wxRGN_XOR:
 199                 *this = rgn;
 200                 break;
 201
 202             default:
 203                 wxFAIL_MSG( _T("unknown region operation") );
 204                 // fall through
 205
 206             case wxRGN_AND:
 207             case wxRGN_DIFF:
 208                 // leave empty/invalid
 209                 return FALSE;
 210         }
 211     }
 212     else // we have a valid region
 213     {
 214         AllocExclusive();
 215
 216         int mode;
 217         switch ( op )
 218         {
 219             case wxRGN_AND:
 220                 mode = RGN_AND;
 221                 break;
 222
 223             case wxRGN_OR:
 224                 mode = RGN_OR;
 225                 break;
 226
 227             case wxRGN_XOR:
 228                 mode = RGN_XOR;
 229                 break;
 230
 231             case wxRGN_DIFF:
 232                 mode = RGN_DIFF;
 233                 break;
 234
 235             default:
 236                 wxFAIL_MSG( _T("unknown region operation") );
 237                 // fall through
 238
 239             case wxRGN_COPY:
 240                 mode = RGN_COPY;
 241                 break;
 242         }
 243
 244         if ( ::CombineRgn(M_REGION, M_REGION, M_REGION_OF(rgn), mode) == ERROR )
 245         {
 246             wxLogLastError(_T("CombineRgn"));
 247
 248             return FALSE;
 249         }
 250     }
 251
 252     return TRUE;
 253 }
 254
 255 // Combine rectangle (x, y, w, h) with this.
 256 bool wxRegion::Combine(wxCoord x, wxCoord y,
 257                        wxCoord width, wxCoord height,
 258                        wxRegionOp op)
 259 {
 260     return Combine(wxRegion(x, y, width, height), op);
 261 }
 262
 263 bool wxRegion::Combine(const wxRect& rect, wxRegionOp op)
 264 {
 265     return Combine(rect.GetLeft(), rect.GetTop(),
 266                    rect.GetWidth(), rect.GetHeight(), op);
 267 }
 268
 269 // ----------------------------------------------------------------------------
 270 // wxRegion bounding box
 271 // ----------------------------------------------------------------------------
 272
 273 // Outer bounds of region
 274 void wxRegion::GetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
 275 {
 276     if (m_refData)
 277     {
 278         RECT rect;
 279         ::GetRgnBox(M_REGION, & rect);
 280         x = rect.left;
 281         y = rect.top;
 282         w = rect.right - rect.left;
 283         h = rect.bottom - rect.top;
 284     }
 285     else
 286     {
 287         x = y = w = h = 0;
 288     }
 289 }
 290
 291 wxRect wxRegion::GetBox() const
 292 {
 293     wxCoord x, y, w, h;
 294     GetBox(x, y, w, h);
 295     return wxRect(x, y, w, h);
 296 }
 297
 298 // Is region empty?
 299 bool wxRegion::Empty() const
 300 {
 301     wxCoord x, y, w, h;
 302     GetBox(x, y, w, h);
 303
 304     return (w == 0) && (h == 0);
 305 }
 306
 307 // ----------------------------------------------------------------------------
 308 // wxRegion hit testing
 309 // ----------------------------------------------------------------------------
 310
 311 // Does the region contain the point (x,y)?
 312 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y) const
 313 {
 314     if (!m_refData)
 315         return wxOutRegion;
 316
 317     return ::PtInRegion(M_REGION, (int) x, (int) y) ? wxInRegion : wxOutRegion;
 318 }
 319
 320 // Does the region contain the point pt?
 321 wxRegionContain wxRegion::Contains(const wxPoint& pt) const
 322 {
 323     return Contains(pt.x, pt.y);
 324 }
 325
 326 // Does the region contain the rectangle (x, y, w, h)?
 327 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y,
 328                                    wxCoord w, wxCoord h) const
 329 {
 330     if (!m_refData)
 331         return wxOutRegion;
 332
 333     RECT rect;
 334     rect.left = x;
 335     rect.top = y;
 336     rect.right = x + w;
 337     rect.bottom = y + h;
 338
 339     return ::RectInRegion(M_REGION, &rect) ? wxInRegion : wxOutRegion;
 340 }
 341
 342 // Does the region contain the rectangle rect
 343 wxRegionContain wxRegion::Contains(const wxRect& rect) const
 344 {
 345     return Contains(rect.x, rect.y, rect.width, rect.height);
 346 }
 347
 348 // Get internal region handle
 349 WXHRGN wxRegion::GetHRGN() const
 350 {
 351     return (WXHRGN)(m_refData ? M_REGION : 0);
 352 }
 353
 354 // ============================================================================
 355 // wxRegionIterator implementation
 356 // ============================================================================
 357
 358 // ----------------------------------------------------------------------------
 359 // wxRegionIterator ctors/dtor
 360 // ----------------------------------------------------------------------------
 361
 362 void wxRegionIterator::Init()
 363 {
 364     m_current =
 365     m_numRects = 0;
 366
 367     m_rects = NULL;
 368 }
 369
 370 wxRegionIterator::~wxRegionIterator()
 371 {
 372     delete [] m_rects;
 373 }
 374
 375 // Initialize iterator for region
 376 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 377 {
 378     m_rects = NULL;
 379
 380     Reset(region);
 381 }
 382
 383 wxRegionIterator& wxRegionIterator::operator=(const wxRegionIterator& ri)
 384 {
 385     delete [] m_rects;
 386
 387     m_current = ri.m_current;
 388     m_numRects = ri.m_numRects;
 389     if ( m_numRects )
 390     {
 391         m_rects = new wxRect[m_numRects];
 392         for ( long n = 0; n < m_numRects; n++ )
 393             m_rects[n] = ri.m_rects[n];
 394     }
 395     else
 396     {
 397         m_rects = NULL;
 398     }
 399
 400     return *this;
 401 }
 402
 403 // ----------------------------------------------------------------------------
 404 // wxRegionIterator operations
 405 // ----------------------------------------------------------------------------
 406
 407 // Reset iterator for a new region.
 408 void wxRegionIterator::Reset(const wxRegion& region)
 409 {
 410     m_current = 0;
 411     m_region = region;
 412
 413     if (m_rects)
 414     {
 415         delete[] m_rects;
 416
 417         m_rects = NULL;
 418     }
 419
 420     if (m_region.Empty())
 421         m_numRects = 0;
 422     else
 423     {
 424         DWORD noBytes = ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, 0, NULL);
 425         RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
 426         ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, noBytes, rgnData);
 427
 428         RGNDATAHEADER* header = (RGNDATAHEADER*) rgnData;
 429
 430         m_rects = new wxRect[header->nCount];
 431
 432         RECT* rect = (RECT*) ((char*)rgnData + sizeof(RGNDATAHEADER));
 433         size_t i;
 434         for (i = 0; i < header->nCount; i++)
 435         {
 436             m_rects[i] = wxRect(rect->left, rect->top,
 437                                  rect->right - rect->left, rect->bottom - rect->top);
 438             rect ++; // Advances pointer by sizeof(RECT)
 439         }
 440
 441         m_numRects = header->nCount;
 442
 443         delete[] (char*) rgnData;
 444     }
 445 }
 446
 447 wxRegionIterator& wxRegionIterator::operator++()
 448 {
 449     if (m_current < m_numRects)
 450         ++m_current;
 451
 452     return *this;
 453 }
 454
 455 wxRegionIterator wxRegionIterator::operator ++ (int)
 456 {
 457     wxRegionIterator tmp = *this;
 458     if (m_current < m_numRects)
 459         ++m_current;
 460
 461     return tmp;
 462 }
 463
 464 // ----------------------------------------------------------------------------
 465 // wxRegionIterator accessors
 466 // ----------------------------------------------------------------------------
 467
 468 wxCoord wxRegionIterator::GetX() const
 469 {
 470     wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
 471
 472     return m_rects[m_current].x;
 473 }
 474
 475 wxCoord wxRegionIterator::GetY() const
 476 {
 477     wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
 478
 479     return m_rects[m_current].y;
 480 }
 481
 482 wxCoord wxRegionIterator::GetW() const
 483 {
 484     wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
 485
 486     return m_rects[m_current].width;
 487 }
 488
 489 wxCoord wxRegionIterator::GetH() const
 490 {
 491     wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
 492
 493     return m_rects[m_current].height;
 494 }
 495