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 #ifdef __WXMICROWIN__
 109     m_refData = NULL;
 110     M_REGION = NULL;
 111 #else
 112     m_refData = new wxRegionRefData;
 113     M_REGION = ::CreatePolygonRgn
 114                (
 115                     (POINT*)points,
 116                     n,
 117                     fillStyle == wxODDEVEN_RULE ? ALTERNATE : WINDING
 118                );
 119 #endif
 120 }
 121
 122 /*
 123  * Destroy the region.
 124  */
 125 wxRegion::~wxRegion()
 126 {
 127     // m_refData unrefed in ~wxObject
 128 }
 129
 130 //-----------------------------------------------------------------------------
 131 // Modify region
 132 //-----------------------------------------------------------------------------
 133
 134 // Clear current region
 135 void wxRegion::Clear()
 136 {
 137     UnRef();
 138 }
 139
 140 // Combine rectangle (x, y, w, h) with this.
 141 bool wxRegion::Combine(wxCoord x, wxCoord y, wxCoord width, wxCoord height, wxRegionOp op)
 142 {
 143     // Don't change shared data
 144     if (!m_refData) {
 145         m_refData = new wxRegionRefData();
 146     } else if (m_refData->GetRefCount() > 1) {
 147         wxRegionRefData* ref = (wxRegionRefData*)m_refData;
 148         UnRef();
 149         m_refData = new wxRegionRefData(*ref);
 150     }
 151     // If ref count is 1, that means it's 'ours' anyway so no action.
 152
 153     HRGN rectRegion = ::CreateRectRgn(x, y, x + width, y + height);
 154
 155     int mode = 0;
 156     switch (op)
 157     {
 158         case wxRGN_AND: mode = RGN_AND; break ;
 159         case wxRGN_OR: mode = RGN_OR; break ;
 160         case wxRGN_XOR: mode = RGN_XOR; break ;
 161         case wxRGN_DIFF: mode = RGN_DIFF; break ;
 162         case wxRGN_COPY:
 163         default:
 164             mode = RGN_COPY; break ;
 165     }
 166
 167     bool success = (ERROR != ::CombineRgn(M_REGION, M_REGION, rectRegion, mode));
 168
 169     ::DeleteObject(rectRegion);
 170
 171     return success;
 172 }
 173
 174 // Union /e region with this.
 175 bool wxRegion::Combine(const wxRegion& region, wxRegionOp op)
 176 {
 177     if (region.Empty())
 178         return FALSE;
 179
 180     // Don't change shared data
 181     if (!m_refData) {
 182         m_refData = new wxRegionRefData();
 183     } else    if (m_refData->GetRefCount() > 1) {
 184         wxRegionRefData* ref = (wxRegionRefData*)m_refData;
 185         UnRef();
 186         m_refData = new wxRegionRefData(*ref);
 187     }
 188
 189     int mode = 0;
 190     switch (op)
 191     {
 192         case wxRGN_AND: mode = RGN_AND; break ;
 193         case wxRGN_OR: mode = RGN_OR; break ;
 194         case wxRGN_XOR: mode = RGN_XOR; break ;
 195         case wxRGN_DIFF: mode = RGN_DIFF; break ;
 196         case wxRGN_COPY:
 197         default:
 198             mode = RGN_COPY; break ;
 199     }
 200
 201     return (ERROR != ::CombineRgn(M_REGION, M_REGION, ((wxRegionRefData*)region.m_refData)->m_region, mode));
 202 }
 203
 204 bool wxRegion::Combine(const wxRect& rect, wxRegionOp op)
 205 {
 206     return Combine(rect.GetLeft(), rect.GetTop(), rect.GetWidth(), rect.GetHeight(), op);
 207 }
 208
 209 //-----------------------------------------------------------------------------
 210 // Information on region
 211 //-----------------------------------------------------------------------------
 212
 213 // Outer bounds of region
 214 void wxRegion::GetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
 215 {
 216     if (m_refData)
 217     {
 218         RECT rect;
 219         ::GetRgnBox(M_REGION, & rect);
 220         x = rect.left;
 221         y = rect.top;
 222         w = rect.right - rect.left;
 223         h = rect.bottom - rect.top;
 224     }
 225     else
 226     {
 227         x = y = w = h = 0;
 228     }
 229 }
 230
 231 wxRect wxRegion::GetBox() const
 232 {
 233     wxCoord x, y, w, h;
 234     GetBox(x, y, w, h);
 235     return wxRect(x, y, w, h);
 236 }
 237
 238 // Is region empty?
 239 bool wxRegion::Empty() const
 240 {
 241     wxCoord x, y, w, h;
 242     GetBox(x, y, w, h);
 243
 244     return (w == 0) && (h == 0);
 245 }
 246
 247 //-----------------------------------------------------------------------------
 248 // Tests
 249 //-----------------------------------------------------------------------------
 250
 251 // Does the region contain the point (x,y)?
 252 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y) const
 253 {
 254     if (!m_refData)
 255         return wxOutRegion;
 256
 257     if (::PtInRegion(M_REGION, (int) x, (int) y))
 258         return wxInRegion;
 259     else
 260         return wxOutRegion;
 261 }
 262
 263 // Does the region contain the point pt?
 264 wxRegionContain wxRegion::Contains(const wxPoint& pt) const
 265 {
 266     if (!m_refData)
 267         return wxOutRegion;
 268
 269     if (::PtInRegion(M_REGION, (int) pt.x, (int) pt.y))
 270         return wxInRegion;
 271     else
 272         return wxOutRegion;
 273 }
 274
 275 // Does the region contain the rectangle (x, y, w, h)?
 276 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y, wxCoord w, wxCoord h) const
 277 {
 278     if (!m_refData)
 279         return wxOutRegion;
 280
 281     RECT rect;
 282     rect.left = x;
 283     rect.top = y;
 284     rect.right = x + w;
 285     rect.bottom = y + h;
 286
 287     if (::RectInRegion(M_REGION, & rect))
 288         return wxInRegion;
 289     else
 290         return wxOutRegion;
 291 }
 292
 293 // Does the region contain the rectangle rect
 294 wxRegionContain wxRegion::Contains(const wxRect& rect) const
 295 {
 296     if (!m_refData)
 297         return wxOutRegion;
 298
 299     wxCoord x, y, w, h;
 300     x = rect.x;
 301     y = rect.y;
 302     w = rect.GetWidth();
 303     h = rect.GetHeight();
 304     return Contains(x, y, w, h);
 305 }
 306
 307 // Get internal region handle
 308 WXHRGN wxRegion::GetHRGN() const
 309 {
 310     if (!m_refData)
 311         return (WXHRGN) 0;
 312     return (WXHRGN) M_REGION;
 313 }
 314
 315 ///////////////////////////////////////////////////////////////////////////////
 316 //                                                                             //
 317 //                               wxRegionIterator                                 //
 318 //                                                                             //
 319 ///////////////////////////////////////////////////////////////////////////////
 320
 321 /*
 322  * Initialize empty iterator
 323  */
 324 wxRegionIterator::wxRegionIterator() : m_current(0), m_numRects(0), m_rects(NULL)
 325 {
 326 }
 327
 328 wxRegionIterator::~wxRegionIterator()
 329 {
 330     if (m_rects)
 331         delete[] m_rects;
 332 }
 333
 334 /*
 335  * Initialize iterator for region
 336  */
 337 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 338 {
 339     m_rects = NULL;
 340
 341     Reset(region);
 342 }
 343
 344 /*
 345  * Reset iterator for a new /e region.
 346  */
 347 void wxRegionIterator::Reset(const wxRegion& region)
 348 {
 349     m_current = 0;
 350     m_region = region;
 351
 352     if (m_rects)
 353         delete[] m_rects;
 354
 355     m_rects = NULL;
 356
 357     if (m_region.Empty())
 358         m_numRects = 0;
 359     else
 360     {
 361 #if defined(__WIN32__)
 362         DWORD noBytes = ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, 0, NULL);
 363         RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
 364         ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, noBytes, rgnData);
 365
 366         RGNDATAHEADER* header = (RGNDATAHEADER*) rgnData;
 367
 368         m_rects = new wxRect[header->nCount];
 369
 370         RECT* rect = (RECT*) ((char*)rgnData + sizeof(RGNDATAHEADER)) ;
 371         size_t i;
 372         for (i = 0; i < header->nCount; i++)
 373         {
 374             m_rects[i] = wxRect(rect->left, rect->top,
 375                                  rect->right - rect->left, rect->bottom - rect->top);
 376             rect ++; // Advances pointer by sizeof(RECT)
 377         }
 378
 379         m_numRects = header->nCount;
 380
 381         delete[] (char*) rgnData;
 382 #else
 383         RECT rect;
 384         ::GetRgnBox(((wxRegionRefData*)region.m_refData)->m_region, &rect);
 385         m_rects = new wxRect[1];
 386         m_rects[0].x = rect.left;
 387         m_rects[0].y = rect.top;
 388         m_rects[0].width = rect.right - rect.left;
 389         m_rects[0].height = rect.bottom - rect.top;
 390
 391         m_numRects = 1;
 392 #endif
 393     }
 394 }
 395
 396 /*
 397  * Increment iterator. The rectangle returned is the one after the
 398  * incrementation.
 399  */
 400 void wxRegionIterator::operator ++ ()
 401 {
 402     if (m_current < m_numRects)
 403         ++m_current;
 404 }
 405
 406 /*
 407  * Increment iterator. The rectangle returned is the one before the
 408  * incrementation.
 409  */
 410 void wxRegionIterator::operator ++ (int)
 411 {
 412     if (m_current < m_numRects)
 413         ++m_current;
 414 }
 415
 416 wxCoord wxRegionIterator::GetX() const
 417 {
 418     if (m_current < m_numRects)
 419         return m_rects[m_current].x;
 420     return 0;
 421 }
 422
 423 wxCoord wxRegionIterator::GetY() const
 424 {
 425     if (m_current < m_numRects)
 426         return m_rects[m_current].y;
 427     return 0;
 428 }
 429
 430 wxCoord wxRegionIterator::GetW() const
 431 {
 432     if (m_current < m_numRects)
 433         return m_rects[m_current].width ;
 434     return 0;
 435 }
 436
 437 wxCoord wxRegionIterator::GetH() const
 438 {
 439     if (m_current < m_numRects)
 440         return m_rects[m_current].height;
 441     return 0;
 442 }
 443