src/msw/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:      msw/region.cpp
   3 // Purpose:   Region handling for wxWindows/X11
   4 // Author:    Markus Holzem
   5 // Modified by:
   6 // Created:   Fri Oct 24 10:46:34 MET 1997
   7 // RCS-ID:    $Id$
   8 // Copyright: (c) 1997 Julian Smart and Markus Holzem
   9 // Licence:   wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "region.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #include "wx/msw/region.h"
  24 #include "wx/gdicmn.h"
  25
  26 #include "wx/window.h"
  27 #include "wx/msw/private.h"
  28
  29 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  30 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
  31
  32 //-----------------------------------------------------------------------------
  33 // wxRegionRefData implementation
  34 //-----------------------------------------------------------------------------
  35
  36 class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
  37 {
  38 public:
  39     wxRegionRefData()
  40     {
  41         m_region = 0;
  42     }
  43
  44     wxRegionRefData(const wxRegionRefData& data)
  45     {
  46 #if defined(__WIN32__) && !defined(__WXMICROWIN__)
  47         DWORD noBytes = ::GetRegionData(data.m_region, 0, NULL);
  48         RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
  49         ::GetRegionData(data.m_region, noBytes, rgnData);
  50         m_region = ::ExtCreateRegion(NULL, noBytes, rgnData);
  51         delete[] (char*) rgnData;
  52 #else
  53         RECT rect;
  54         ::GetRgnBox(data.m_region, &rect);
  55         m_region = ::CreateRectRgnIndirect(&rect);
  56 #endif
  57     }
  58
  59     ~wxRegionRefData()
  60     {
  61         ::DeleteObject(m_region);
  62         m_region = 0;
  63     }
  64
  65     HRGN m_region;
  66 };
  67
  68 #define M_REGION (((wxRegionRefData*)m_refData)->m_region)
  69
  70 //-----------------------------------------------------------------------------
  71 // wxRegion
  72 //-----------------------------------------------------------------------------
  73
  74 /*
  75  * Create an empty region.
  76  */
  77 wxRegion::wxRegion()
  78 {
  79     m_refData = (wxRegionRefData *)NULL;
  80 }
  81
  82 wxRegion::wxRegion(WXHRGN hRegion)
  83 {
  84     m_refData = new wxRegionRefData;
  85     M_REGION = (HRGN) hRegion;
  86 }
  87
  88 wxRegion::wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
  89 {
  90     m_refData = new wxRegionRefData;
  91     M_REGION = ::CreateRectRgn(x, y, x + w, y + h);
  92 }
  93
  94 wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
  95 {
  96     m_refData = new wxRegionRefData;
  97     M_REGION = ::CreateRectRgn(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
  98 }
  99
 100 wxRegion::wxRegion(const wxRect& rect)
 101 {
 102     m_refData = new wxRegionRefData;
 103     M_REGION = ::CreateRectRgn(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
 104 }
 105
 106 wxRegion::wxRegion(size_t n, const wxPoint *points, int fillStyle)
 107 {
 108     m_refData = new wxRegionRefData;
 109     M_REGION = ::CreatePolygonRgn
 110                (
 111                     (POINT*)points,
 112                     n,
 113                     fillStyle == wxODDEVEN_RULE ? ALTERNATE : WINDING
 114                );
 115 }
 116
 117 /*
 118  * Destroy the region.
 119  */
 120 wxRegion::~wxRegion()
 121 {
 122     // m_refData unrefed in ~wxObject
 123 }
 124
 125 //-----------------------------------------------------------------------------
 126 // Modify region
 127 //-----------------------------------------------------------------------------
 128
 129 // Clear current region
 130 void wxRegion::Clear()
 131 {
 132     UnRef();
 133 }
 134
 135 // Combine rectangle (x, y, w, h) with this.
 136 bool wxRegion::Combine(wxCoord x, wxCoord y, wxCoord width, wxCoord height, wxRegionOp op)
 137 {
 138     // Don't change shared data
 139     if (!m_refData) {
 140         m_refData = new wxRegionRefData();
 141     } else if (m_refData->GetRefCount() > 1) {
 142         wxRegionRefData* ref = (wxRegionRefData*)m_refData;
 143         UnRef();
 144         m_refData = new wxRegionRefData(*ref);
 145     }
 146     // If ref count is 1, that means it's 'ours' anyway so no action.
 147
 148     HRGN rectRegion = ::CreateRectRgn(x, y, x + width, y + height);
 149
 150     int mode = 0;
 151     switch (op)
 152     {
 153         case wxRGN_AND: mode = RGN_AND; break ;
 154         case wxRGN_OR: mode = RGN_OR; break ;
 155         case wxRGN_XOR: mode = RGN_XOR; break ;
 156         case wxRGN_DIFF: mode = RGN_DIFF; break ;
 157         case wxRGN_COPY:
 158         default:
 159             mode = RGN_COPY; break ;
 160     }
 161
 162     bool success = (ERROR != ::CombineRgn(M_REGION, M_REGION, rectRegion, mode));
 163
 164     ::DeleteObject(rectRegion);
 165
 166     return success;
 167 }
 168
 169 // Union /e region with this.
 170 bool wxRegion::Combine(const wxRegion& region, wxRegionOp op)
 171 {
 172     if (region.Empty())
 173         return FALSE;
 174
 175     // Don't change shared data
 176     if (!m_refData) {
 177         m_refData = new wxRegionRefData();
 178     } else    if (m_refData->GetRefCount() > 1) {
 179         wxRegionRefData* ref = (wxRegionRefData*)m_refData;
 180         UnRef();
 181         m_refData = new wxRegionRefData(*ref);
 182     }
 183
 184     int mode = 0;
 185     switch (op)
 186     {
 187         case wxRGN_AND: mode = RGN_AND; break ;
 188         case wxRGN_OR: mode = RGN_OR; break ;
 189         case wxRGN_XOR: mode = RGN_XOR; break ;
 190         case wxRGN_DIFF: mode = RGN_DIFF; break ;
 191         case wxRGN_COPY:
 192         default:
 193             mode = RGN_COPY; break ;
 194     }
 195
 196     return (ERROR != ::CombineRgn(M_REGION, M_REGION, ((wxRegionRefData*)region.m_refData)->m_region, mode));
 197 }
 198
 199 bool wxRegion::Combine(const wxRect& rect, wxRegionOp op)
 200 {
 201     return Combine(rect.GetLeft(), rect.GetTop(), rect.GetWidth(), rect.GetHeight(), op);
 202 }
 203
 204 //-----------------------------------------------------------------------------
 205 // Information on region
 206 //-----------------------------------------------------------------------------
 207
 208 // Outer bounds of region
 209 void wxRegion::GetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
 210 {
 211     if (m_refData)
 212     {
 213         RECT rect;
 214         ::GetRgnBox(M_REGION, & rect);
 215         x = rect.left;
 216         y = rect.top;
 217         w = rect.right - rect.left;
 218         h = rect.bottom - rect.top;
 219     }
 220     else
 221     {
 222         x = y = w = h = 0;
 223     }
 224 }
 225
 226 wxRect wxRegion::GetBox() const
 227 {
 228     wxCoord x, y, w, h;
 229     GetBox(x, y, w, h);
 230     return wxRect(x, y, w, h);
 231 }
 232
 233 // Is region empty?
 234 bool wxRegion::Empty() const
 235 {
 236     wxCoord x, y, w, h;
 237     GetBox(x, y, w, h);
 238
 239     return (w == 0) && (h == 0);
 240 }
 241
 242 //-----------------------------------------------------------------------------
 243 // Tests
 244 //-----------------------------------------------------------------------------
 245
 246 // Does the region contain the point (x,y)?
 247 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y) const
 248 {
 249     if (!m_refData)
 250         return wxOutRegion;
 251
 252     if (::PtInRegion(M_REGION, (int) x, (int) y))
 253         return wxInRegion;
 254     else
 255         return wxOutRegion;
 256 }
 257
 258 // Does the region contain the point pt?
 259 wxRegionContain wxRegion::Contains(const wxPoint& pt) const
 260 {
 261     if (!m_refData)
 262         return wxOutRegion;
 263
 264     if (::PtInRegion(M_REGION, (int) pt.x, (int) pt.y))
 265         return wxInRegion;
 266     else
 267         return wxOutRegion;
 268 }
 269
 270 // Does the region contain the rectangle (x, y, w, h)?
 271 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y, wxCoord w, wxCoord h) const
 272 {
 273     if (!m_refData)
 274         return wxOutRegion;
 275
 276     RECT rect;
 277     rect.left = x;
 278     rect.top = y;
 279     rect.right = x + w;
 280     rect.bottom = y + h;
 281
 282     if (::RectInRegion(M_REGION, & rect))
 283         return wxInRegion;
 284     else
 285         return wxOutRegion;
 286 }
 287
 288 // Does the region contain the rectangle rect
 289 wxRegionContain wxRegion::Contains(const wxRect& rect) const
 290 {
 291     if (!m_refData)
 292         return wxOutRegion;
 293
 294     wxCoord x, y, w, h;
 295     x = rect.x;
 296     y = rect.y;
 297     w = rect.GetWidth();
 298     h = rect.GetHeight();
 299     return Contains(x, y, w, h);
 300 }
 301
 302 // Get internal region handle
 303 WXHRGN wxRegion::GetHRGN() const
 304 {
 305     if (!m_refData)
 306         return (WXHRGN) 0;
 307     return (WXHRGN) M_REGION;
 308 }
 309
 310 ///////////////////////////////////////////////////////////////////////////////
 311 //                                                                             //
 312 //                               wxRegionIterator                                 //
 313 //                                                                             //
 314 ///////////////////////////////////////////////////////////////////////////////
 315
 316 /*
 317  * Initialize empty iterator
 318  */
 319 wxRegionIterator::wxRegionIterator() : m_current(0), m_numRects(0), m_rects(NULL)
 320 {
 321 }
 322
 323 wxRegionIterator::~wxRegionIterator()
 324 {
 325     if (m_rects)
 326         delete[] m_rects;
 327 }
 328
 329 /*
 330  * Initialize iterator for region
 331  */
 332 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 333 {
 334     m_rects = NULL;
 335
 336     Reset(region);
 337 }
 338
 339 /*
 340  * Reset iterator for a new /e region.
 341  */
 342 void wxRegionIterator::Reset(const wxRegion& region)
 343 {
 344     m_current = 0;
 345     m_region = region;
 346
 347     if (m_rects)
 348         delete[] m_rects;
 349
 350     m_rects = NULL;
 351
 352     if (m_region.Empty())
 353         m_numRects = 0;
 354     else
 355     {
 356 #if defined(__WIN32__)
 357         DWORD noBytes = ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, 0, NULL);
 358         RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
 359         ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, noBytes, rgnData);
 360
 361         RGNDATAHEADER* header = (RGNDATAHEADER*) rgnData;
 362
 363         m_rects = new wxRect[header->nCount];
 364
 365         RECT* rect = (RECT*) ((char*)rgnData + sizeof(RGNDATAHEADER)) ;
 366         size_t i;
 367         for (i = 0; i < header->nCount; i++)
 368         {
 369             m_rects[i] = wxRect(rect->left, rect->top,
 370                                  rect->right - rect->left, rect->bottom - rect->top);
 371             rect ++; // Advances pointer by sizeof(RECT)
 372         }
 373
 374         m_numRects = header->nCount;
 375
 376         delete[] (char*) rgnData;
 377 #else
 378         RECT rect;
 379         ::GetRgnBox(((wxRegionRefData*)region.m_refData)->m_region, &rect);
 380         m_rects = new wxRect[1];
 381         m_rects[0].x = rect.left;
 382         m_rects[0].y = rect.top;
 383         m_rects[0].width = rect.right - rect.left;
 384         m_rects[0].height = rect.bottom - rect.top;
 385
 386         m_numRects = 1;
 387 #endif
 388     }
 389 }
 390
 391 /*
 392  * Increment iterator. The rectangle returned is the one after the
 393  * incrementation.
 394  */
 395 void wxRegionIterator::operator ++ ()
 396 {
 397     if (m_current < m_numRects)
 398         ++m_current;
 399 }
 400
 401 /*
 402  * Increment iterator. The rectangle returned is the one before the
 403  * incrementation.
 404  */
 405 void wxRegionIterator::operator ++ (int)
 406 {
 407     if (m_current < m_numRects)
 408         ++m_current;
 409 }
 410
 411 wxCoord wxRegionIterator::GetX() const
 412 {
 413     if (m_current < m_numRects)
 414         return m_rects[m_current].x;
 415     return 0;
 416 }
 417
 418 wxCoord wxRegionIterator::GetY() const
 419 {
 420     if (m_current < m_numRects)
 421         return m_rects[m_current].y;
 422     return 0;
 423 }
 424
 425 wxCoord wxRegionIterator::GetW() const
 426 {
 427     if (m_current < m_numRects)
 428         return m_rects[m_current].width ;
 429     return 0;
 430 }
 431
 432 wxCoord wxRegionIterator::GetH() const
 433 {
 434     if (m_current < m_numRects)
 435         return m_rects[m_current].height;
 436     return 0;
 437 }
 438