src/mgl/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:      src/mgl/region.cpp
   3 // Purpose:   Region handling for wxWidgets/MGL
   4 // Author:    Vaclav Slavik
   5 // RCS-ID:    $Id$
   6 // Copyright: (c) 2001-2002 SciTech Software, Inc. (www.scitechsoft.com)
   7 // Licence:   wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #include "wx/region.h"
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/gdicmn.h"
  21     #include "wx/module.h"
  22 #endif
  23
  24 #include "wx/thread.h"
  25
  26 #include <mgraph.hpp>
  27
  28 #include "wx/listimpl.cpp"
  29 WX_DEFINE_LIST(wxRegionRectList)
  30
  31 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  32 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
  33
  34 //-----------------------------------------------------------------------------
  35 // wxRegionRefData implementation
  36 //-----------------------------------------------------------------------------
  37
  38 class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
  39 {
  40 public:
  41     wxRegionRefData() {}
  42
  43     wxRegionRefData(const wxRegionRefData& data)
  44     {
  45         m_region = data.m_region;
  46     }
  47
  48     virtual ~wxRegionRefData() {}
  49
  50     MGLRegion m_region;
  51 };
  52
  53 #define M_REGION       (((wxRegionRefData*)m_refData)->m_region)
  54 #define M_REGION_OF(r) (((wxRegionRefData*)(r.m_refData))->m_region)
  55
  56 //-----------------------------------------------------------------------------
  57 // wxRegion
  58 //-----------------------------------------------------------------------------
  59
  60 wxGDIRefData *wxRegion::CreateGDIRefData() const
  61 {
  62     return new wxRegionRefData;
  63 }
  64
  65 wxGDIRefData *wxRegion::CloneGDIRefData(const wxGDIRefData *data) const
  66 {
  67     return new wxRegionRefData(*(wxRegionRefData *)data);
  68 }
  69
  70 /*
  71  * Create an empty region.
  72  */
  73 wxRegion::wxRegion()
  74 {
  75     m_refData = NULL;
  76 }
  77
  78 wxRegion::wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
  79 {
  80     m_refData = new wxRegionRefData;
  81     MGLRect rect(x, y, x + w, y + h);
  82     M_REGION = rect;
  83 }
  84
  85 wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
  86 {
  87     m_refData = new wxRegionRefData;
  88     MGLRect rect(topLeft.x, topLeft.y, bottomRight.x+1, bottomRight.y+1);
  89     M_REGION = rect;
  90 }
  91
  92 wxRegion::wxRegion(const wxRect& r)
  93 {
  94     m_refData = new wxRegionRefData;
  95     MGLRect rect(r.GetLeft(), r.GetTop(), r.GetRight()+1, r.GetBottom()+1);
  96     M_REGION = rect;
  97 }
  98
  99 wxRegion::wxRegion(const MGLRegion& region)
 100 {
 101     m_refData = new wxRegionRefData;
 102     M_REGION = region;
 103 }
 104
 105 wxRegion::wxRegion(size_t n, const wxPoint *points, int WXUNUSED(fillStyle))
 106 {
 107     m_refData = new wxRegionRefData;
 108     point_t *pts = new point_t[n];
 109
 110     for (size_t i = 0; i < n; i++)
 111     {
 112         pts[i].x = points[i].x;
 113         pts[i].y = points[i].y;
 114     }
 115
 116     region_t* rgn = MGL_rgnPolygon(n, pts, 1, 0, 0);
 117
 118     M_REGION = rgn;
 119
 120     delete [] pts;
 121 }
 122
 123 wxRegion::~wxRegion()
 124 {
 125     // m_refData unrefed in ~wxObject
 126 }
 127
 128 const MGLRegion& wxRegion::GetMGLRegion() const
 129 {
 130     return M_REGION;
 131 }
 132
 133 //-----------------------------------------------------------------------------
 134 // Modify region
 135 //-----------------------------------------------------------------------------
 136
 137 // Clear current region
 138 void wxRegion::Clear()
 139 {
 140     UnRef();
 141 }
 142
 143
 144 //-----------------------------------------------------------------------------
 145 // Information on region
 146 //-----------------------------------------------------------------------------
 147
 148 bool wxRegion::DoIsEqual(const wxRegion& WXUNUSED(region)) const
 149 {
 150     wxFAIL_MSG( wxT("not implemented") );
 151
 152     return false;
 153 }
 154
 155 // Outer bounds of region
 156 bool wxRegion::DoGetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
 157 {
 158     if (m_refData)
 159     {
 160         rect_t rect;
 161         rect = M_REGION.getBounds();
 162         x = rect.left;
 163         y = rect.top;
 164         w = rect.right - rect.left;
 165         h = rect.bottom - rect.top;
 166
 167         return true;
 168     }
 169     else
 170     {
 171         x = y = w = h = 0;
 172         return false;
 173     }
 174 }
 175
 176 // Is region empty?
 177 bool wxRegion::IsEmpty() const
 178 {
 179     if (!m_refData)
 180         return true;
 181
 182     return (bool)(M_REGION.isEmpty());
 183 }
 184
 185 //-----------------------------------------------------------------------------
 186 // Modifications
 187 //-----------------------------------------------------------------------------
 188
 189 bool wxRegion::DoOffset(wxCoord x, wxCoord y)
 190 {
 191     AllocExclusive();
 192     M_REGION.offset(x, y);
 193     return true;
 194 }
 195
 196 // Union rectangle or region with this.
 197 bool wxRegion::DoUnionWithRect(const wxRect& r)
 198 {
 199     AllocExclusive();
 200     M_REGION += MGLRect(r.x, r.y, r.GetRight() + 1, r.GetHeight() + 1);
 201     return true;
 202 }
 203
 204 bool wxRegion::DoUnionWithRegion(const wxRegion& region)
 205 {
 206     AllocExclusive();
 207     M_REGION += M_REGION_OF(region);
 208     return true;
 209 }
 210
 211 bool wxRegion::DoIntersect(const wxRegion& region)
 212 {
 213     AllocExclusive();
 214     M_REGION &= M_REGION_OF(region);
 215     return true;
 216 }
 217
 218 bool wxRegion::DoSubtract(const wxRegion& region)
 219 {
 220     AllocExclusive();
 221     M_REGION -= M_REGION_OF(region);
 222     return true;
 223 }
 224
 225 bool wxRegion::DoXor(const wxRegion& region)
 226 {
 227     AllocExclusive();
 228     MGLRegion rg1 = M_REGION + M_REGION_OF(region),
 229               rg2 = M_REGION & M_REGION_OF(region);
 230     M_REGION = rg1 - rg2;
 231     return true;
 232 }
 233
 234
 235 //-----------------------------------------------------------------------------
 236 // Tests
 237 //-----------------------------------------------------------------------------
 238
 239 // Does the region contain the point (x,y)?
 240 wxRegionContain wxRegion::DoContainsPoint(wxCoord x, wxCoord y) const
 241 {
 242     if (!m_refData)
 243         return wxOutRegion;
 244
 245     if (M_REGION.includes((int)x, (int)y))
 246         return wxInRegion;
 247     else
 248         return wxOutRegion;
 249 }
 250
 251 // Does the region contain the rectangle (x, y, w, h)?
 252 wxRegionContain wxRegion::DoContainsRect(const wxRect& r) const
 253 {
 254     if (!m_refData)
 255         return wxOutRegion;
 256
 257     MGLRect rect(r.x, r.y, r.GetRight() + 1, r.GetBottom() + 1);
 258     MGLRegion rg;
 259
 260     // 1) is the rectangle entirely covered by the region?
 261     rg = MGLRegion(rect) - M_REGION;
 262     if (rg.isEmpty())
 263         return wxInRegion;
 264
 265     // 2) is the rectangle completely outside the region?
 266     rg = M_REGION & rect; // intersection
 267     if (rg.isEmpty())
 268         return wxOutRegion;
 269
 270     // 3) neither case happened => it is partially covered:
 271     return wxPartRegion;
 272 }
 273
 274 ///////////////////////////////////////////////////////////////////////////////
 275 //                               wxRegionIterator                                 //
 276 ///////////////////////////////////////////////////////////////////////////////
 277
 278 #if wxUSE_THREADS
 279 static wxMutex *gs_mutexIterator;
 280
 281 class wxMglRegionModule : public wxModule
 282 {
 283 public:
 284     virtual bool OnInit()
 285     {
 286         gs_mutexIterator = new wxMutex();
 287         return true;
 288     }
 289     virtual void OnExit()
 290     {
 291         wxDELETE(gs_mutexIterator);
 292     }
 293
 294     DECLARE_DYNAMIC_CLASS(wxMglRegionModule)
 295 };
 296 IMPLEMENT_DYNAMIC_CLASS(wxMglRegionModule, wxModule)
 297 #endif
 298
 299 /*
 300  * Initialize empty iterator
 301  */
 302 wxRegionIterator::wxRegionIterator() : m_currentNode(NULL)
 303 {
 304     m_rects.DeleteContents(true);
 305 }
 306
 307 wxRegionIterator::~wxRegionIterator()
 308 {
 309 }
 310
 311 /*
 312  * Initialize iterator for region
 313  */
 314 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 315 {
 316     m_rects.DeleteContents(true);
 317     Reset(region);
 318 }
 319
 320 /*
 321  * Reset iterator for a new /e region.
 322  */
 323
 324
 325 static wxRegionRectList *gs_rectList;
 326
 327 static void MGLAPI wxMGL_region_callback(const rect_t *r)
 328 {
 329     gs_rectList->Append(new wxRect(r->left, r->top,
 330                                    r->right - r->left, r->bottom - r->top));
 331 }
 332
 333 void wxRegionIterator::Reset(const wxRegion& region)
 334 {
 335     m_currentNode = NULL;
 336     m_rects.Clear();
 337
 338     if (!region.Empty())
 339     {
 340 #if wxUSE_THREADS
 341         wxMutexLocker lock(*gs_mutexIterator);
 342 #endif
 343         gs_rectList = &m_rects;
 344         M_REGION_OF(region).traverse(wxMGL_region_callback);
 345         m_currentNode = m_rects.GetFirst();
 346     }
 347 }
 348
 349 /*
 350  * Increment iterator. The rectangle returned is the one after the
 351  * incrementation.
 352  */
 353 void wxRegionIterator::operator ++ ()
 354 {
 355     if (m_currentNode)
 356         m_currentNode = m_currentNode->GetNext();
 357 }
 358
 359 /*
 360  * Increment iterator. The rectangle returned is the one before the
 361  * incrementation.
 362  */
 363 void wxRegionIterator::operator ++ (int)
 364 {
 365     if (m_currentNode)
 366         m_currentNode = m_currentNode->GetNext();
 367 }
 368
 369 wxCoord wxRegionIterator::GetX() const
 370 {
 371     if (m_currentNode)
 372         return m_currentNode->GetData()->x;
 373     else
 374         return 0;
 375 }
 376
 377 wxCoord wxRegionIterator::GetY() const
 378 {
 379     if (m_currentNode)
 380         return m_currentNode->GetData()->y;
 381     else
 382         return 0;
 383 }
 384
 385 wxCoord wxRegionIterator::GetW() const
 386 {
 387     if (m_currentNode)
 388         return m_currentNode->GetData()->width;
 389     else
 390         return 0;
 391 }
 392
 393 wxCoord wxRegionIterator::GetH() const
 394 {
 395     if (m_currentNode)
 396         return m_currentNode->GetData()->height;
 397     else
 398         return 0;
 399 }