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__)
  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 = new wxRegionRefData;
  80     M_REGION = ::CreateRectRgn(0, 0, 0, 0);
  81 }
  82
  83 wxRegion::wxRegion(WXHRGN hRegion)
  84 {
  85     m_refData = new wxRegionRefData;
  86     M_REGION = (HRGN) hRegion;
  87 }
  88
  89 wxRegion::wxRegion(long x, long y, long w, long h)
  90 {
  91     m_refData = new wxRegionRefData;
  92     M_REGION = ::CreateRectRgn(x, y, x + w, y + h);
  93 }
  94
  95 wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
  96 {
  97     m_refData = new wxRegionRefData;
  98     M_REGION = ::CreateRectRgn(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
  99 }
 100
 101 wxRegion::wxRegion(const wxRect& rect)
 102 {
 103     m_refData = new wxRegionRefData;
 104     M_REGION = ::CreateRectRgn(rect.GetLeft(), rect.GetTop(), rect.GetRight(), rect.GetBottom());
 105 }
 106
 107 /*
 108  * Destroy the region.
 109  */
 110 wxRegion::~wxRegion()
 111 {
 112     // m_refData unrefed in ~wxObject
 113 }
 114
 115 //-----------------------------------------------------------------------------
 116 // Modify region
 117 //-----------------------------------------------------------------------------
 118
 119 // Clear current region
 120 void wxRegion::Clear()
 121 {
 122     UnRef();
 123 }
 124
 125 // Combine rectangle (x, y, w, h) with this.
 126 bool wxRegion::Combine(long x, long y, long width, long height, wxRegionOp op)
 127 {
 128     // Don't change shared data
 129     if (!m_refData) {
 130         m_refData = new wxRegionRefData();
 131     } else if (m_refData->GetRefCount() > 1) {
 132         wxRegionRefData* ref = (wxRegionRefData*)m_refData;
 133         UnRef();
 134         m_refData = new wxRegionRefData(*ref);
 135     }
 136     // If ref count is 1, that means it's 'ours' anyway so no action.
 137
 138     HRGN rectRegion = ::CreateRectRgn(x, y, x + width, y + height);
 139
 140     int mode = 0;
 141     switch (op)
 142     {
 143         case wxRGN_AND: mode = RGN_AND; break ;
 144         case wxRGN_OR: mode = RGN_OR; break ;
 145         case wxRGN_XOR: mode = RGN_XOR; break ;
 146         case wxRGN_DIFF: mode = RGN_DIFF; break ;
 147         case wxRGN_COPY:
 148         default:
 149             mode = RGN_COPY; break ;
 150     }
 151
 152     bool success = (ERROR != ::CombineRgn(M_REGION, M_REGION, rectRegion, mode));
 153
 154     ::DeleteObject(rectRegion);
 155
 156     return success;
 157 }
 158
 159 // Union /e region with this.
 160 bool wxRegion::Combine(const wxRegion& region, wxRegionOp op)
 161 {
 162     if (region.Empty())
 163         return FALSE;
 164
 165     // Don't change shared data
 166     if (!m_refData) {
 167         m_refData = new wxRegionRefData();
 168     } else    if (m_refData->GetRefCount() > 1) {
 169         wxRegionRefData* ref = (wxRegionRefData*)m_refData;
 170         UnRef();
 171         m_refData = new wxRegionRefData(*ref);
 172     }
 173
 174     int mode = 0;
 175     switch (op)
 176     {
 177         case wxRGN_AND: mode = RGN_AND; break ;
 178         case wxRGN_OR: mode = RGN_OR; break ;
 179         case wxRGN_XOR: mode = RGN_XOR; break ;
 180         case wxRGN_DIFF: mode = RGN_DIFF; break ;
 181         case wxRGN_COPY:
 182         default:
 183             mode = RGN_COPY; break ;
 184     }
 185
 186     return (ERROR != ::CombineRgn(M_REGION, M_REGION, ((wxRegionRefData*)region.m_refData)->m_region, mode));
 187 }
 188
 189 bool wxRegion::Combine(const wxRect& rect, wxRegionOp op)
 190 {
 191     return Combine(rect.GetLeft(), rect.GetTop(), rect.GetWidth(), rect.GetHeight(), op);
 192 }
 193
 194 //-----------------------------------------------------------------------------
 195 // Information on region
 196 //-----------------------------------------------------------------------------
 197
 198 // Outer bounds of region
 199 void wxRegion::GetBox(long& x, long& y, long&w, long &h) const
 200 {
 201     if (m_refData) {
 202         RECT rect;
 203         ::GetRgnBox(M_REGION, & rect);
 204         x = rect.left;
 205         y = rect.top;
 206         w = rect.right - rect.left;
 207         h = rect.bottom - rect.top;
 208     } else {
 209         x = y = w = h = 0;
 210     }
 211 }
 212
 213 wxRect wxRegion::GetBox() const
 214 {
 215     long x, y, w, h;
 216     GetBox(x, y, w, h);
 217     return wxRect(x, y, w, h);
 218 }
 219
 220 // Is region empty?
 221 bool wxRegion::Empty() const
 222 {
 223     if (M_REGION == 0)
 224         return TRUE;
 225     long x, y, w, h;
 226     GetBox(x, y, w, h);
 227
 228     return ((w == 0) && (h == 0));
 229 }
 230
 231 //-----------------------------------------------------------------------------
 232 // Tests
 233 //-----------------------------------------------------------------------------
 234
 235 // Does the region contain the point (x,y)?
 236 wxRegionContain wxRegion::Contains(long x, long y) const
 237 {
 238     if (!m_refData)
 239         return wxOutRegion;
 240
 241     if (::PtInRegion(M_REGION, (int) x, (int) y))
 242         return wxInRegion;
 243     else
 244         return wxOutRegion;
 245 }
 246
 247 // Does the region contain the point pt?
 248 wxRegionContain wxRegion::Contains(const wxPoint& pt) const
 249 {
 250     if (!m_refData)
 251         return wxOutRegion;
 252
 253     if (::PtInRegion(M_REGION, (int) pt.x, (int) pt.y))
 254         return wxInRegion;
 255     else
 256         return wxOutRegion;
 257 }
 258
 259 // Does the region contain the rectangle (x, y, w, h)?
 260 wxRegionContain wxRegion::Contains(long x, long y, long w, long h) const
 261 {
 262     if (!m_refData)
 263         return wxOutRegion;
 264
 265     RECT rect;
 266     rect.left = x;
 267     rect.top = y;
 268     rect.right = x + w;
 269     rect.bottom = y + h;
 270
 271     if (::RectInRegion(M_REGION, & rect))
 272         return wxInRegion;
 273     else
 274         return wxOutRegion;
 275 }
 276
 277 // Does the region contain the rectangle rect
 278 wxRegionContain wxRegion::Contains(const wxRect& rect) const
 279 {
 280     if (!m_refData)
 281         return wxOutRegion;
 282
 283     long x, y, w, h;
 284     x = rect.x;
 285     y = rect.y;
 286     w = rect.GetWidth();
 287     h = rect.GetHeight();
 288     return Contains(x, y, w, h);
 289 }
 290
 291 // Get internal region handle
 292 WXHRGN wxRegion::GetHRGN() const
 293 {
 294     if (!m_refData)
 295         return (WXHRGN) 0;
 296     return (WXHRGN) M_REGION;
 297 }
 298
 299 ///////////////////////////////////////////////////////////////////////////////
 300 //                                                                             //
 301 //                               wxRegionIterator                                 //
 302 //                                                                             //
 303 ///////////////////////////////////////////////////////////////////////////////
 304
 305 /*
 306  * Initialize empty iterator
 307  */
 308 wxRegionIterator::wxRegionIterator() : m_current(0), m_numRects(0), m_rects(NULL)
 309 {
 310 }
 311
 312 wxRegionIterator::~wxRegionIterator()
 313 {
 314     if (m_rects)
 315         delete[] m_rects;
 316 }
 317
 318 /*
 319  * Initialize iterator for region
 320  */
 321 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 322 {
 323     m_rects = NULL;
 324
 325     Reset(region);
 326 }
 327
 328 /*
 329  * Reset iterator for a new /e region.
 330  */
 331 void wxRegionIterator::Reset(const wxRegion& region)
 332 {
 333     m_current = 0;
 334     m_region = region;
 335
 336     if (m_rects)
 337         delete[] m_rects;
 338
 339     m_rects = NULL;
 340
 341     if (m_region.Empty())
 342         m_numRects = 0;
 343     else
 344     {
 345 #if defined(__WIN32__)
 346         DWORD noBytes = ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, 0, NULL);
 347         RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
 348         ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, noBytes, rgnData);
 349
 350         RGNDATAHEADER* header = (RGNDATAHEADER*) rgnData;
 351
 352         m_rects = new wxRect[header->nCount];
 353
 354         RECT* rect = (RECT*) ((char*)rgnData + sizeof(RGNDATAHEADER)) ;
 355         size_t i;
 356         for (i = 0; i < header->nCount; i++)
 357         {
 358             m_rects[i] = wxRect(rect->left, rect->top,
 359                                  rect->right - rect->left, rect->bottom - rect->top);
 360             rect ++; // Advances pointer by sizeof(RECT)
 361         }
 362
 363         m_numRects = header->nCount;
 364
 365         delete[] (char*) rgnData;
 366 #else
 367         RECT rect;
 368         ::GetRgnBox(((wxRegionRefData*)region.m_refData)->m_region, &rect);
 369         m_rects = new wxRect[1];
 370         m_rects[0].x = rect.left;
 371         m_rects[0].y = rect.top;
 372         m_rects[0].width = rect.right - rect.left;
 373         m_rects[0].height = rect.bottom - rect.top;
 374
 375         m_numRects = 1;
 376 #endif
 377     }
 378 }
 379
 380 /*
 381  * Increment iterator. The rectangle returned is the one after the
 382  * incrementation.
 383  */
 384 void wxRegionIterator::operator ++ ()
 385 {
 386     if (m_current < m_numRects)
 387         ++m_current;
 388 }
 389
 390 /*
 391  * Increment iterator. The rectangle returned is the one before the
 392  * incrementation.
 393  */
 394 void wxRegionIterator::operator ++ (int)
 395 {
 396     if (m_current < m_numRects)
 397         ++m_current;
 398 }
 399
 400 long wxRegionIterator::GetX() const
 401 {
 402     if (m_current < m_numRects)
 403         return m_rects[m_current].x;
 404     return 0;
 405 }
 406
 407 long wxRegionIterator::GetY() const
 408 {
 409     if (m_current < m_numRects)
 410         return m_rects[m_current].y;
 411     return 0;
 412 }
 413
 414 long wxRegionIterator::GetW() const
 415 {
 416     if (m_current < m_numRects)
 417         return m_rects[m_current].width ;
 418     return 0;
 419 }
 420
 421 long wxRegionIterator::GetH() const
 422 {
 423     if (m_current < m_numRects)
 424         return m_rects[m_current].height;
 425     return 0;
 426 }
 427