src/msw/region.cpp

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