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 wxObjectRefData *wxRegion::CreateRefData() const
  61 {
  62     return new wxRegionRefData;
  63 }
  64
  65 wxObjectRefData *wxRegion::CloneRefData(const wxObjectRefData *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()
 106 {
 107     // m_refData unrefed in ~wxObject
 108 }
 109
 110 const MGLRegion& wxRegion::GetMGLRegion() const
 111 {
 112     return M_REGION;
 113 }
 114
 115 //-----------------------------------------------------------------------------
 116 // Modify region
 117 //-----------------------------------------------------------------------------
 118
 119 // Clear current region
 120 void wxRegion::Clear()
 121 {
 122     UnRef();
 123 }
 124
 125
 126 //-----------------------------------------------------------------------------
 127 // Information on region
 128 //-----------------------------------------------------------------------------
 129
 130 bool wxRegion::DoIsEqual(const wxRegion& region) const
 131 {
 132     wxFAIL_MSG( _T("not implemented") );
 133
 134     return false;
 135 }
 136
 137 // Outer bounds of region
 138 bool wxRegion::DoGetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
 139 {
 140     if (m_refData)
 141     {
 142         rect_t rect;
 143         rect = M_REGION.getBounds();
 144         x = rect.left;
 145         y = rect.top;
 146         w = rect.right - rect.left;
 147         h = rect.bottom - rect.top;
 148
 149         return true;
 150     }
 151     else
 152     {
 153         x = y = w = h = 0;
 154         return false;
 155     }
 156 }
 157
 158 // Is region empty?
 159 bool wxRegion::IsEmpty() const
 160 {
 161     if (!m_refData)
 162         return true;
 163
 164     return (bool)(M_REGION.isEmpty());
 165 }
 166
 167 //-----------------------------------------------------------------------------
 168 // Modifications
 169 //-----------------------------------------------------------------------------
 170
 171 bool wxRegion::DoOffset(wxCoord x, wxCoord y)
 172 {
 173     AllocExclusive();
 174     M_REGION.offset(x, y);
 175     return true;
 176 }
 177
 178 // Union rectangle or region with this.
 179 bool wxRegion::DoUnionWithRect(const wxRect& r)
 180 {
 181     AllocExclusive();
 182     M_REGION += MGLRect(r.x, r.y, r.GetRight() + 1, r.GetHeight() + 1);
 183     return true;
 184 }
 185
 186 bool wxRegion::DoUnionWithRegion(const wxRegion& region)
 187 {
 188     AllocExclusive();
 189     M_REGION += M_REGION_OF(region);
 190     return true;
 191 }
 192
 193 bool wxRegion::DoIntersect(const wxRegion& region)
 194 {
 195     AllocExclusive();
 196     M_REGION &= M_REGION_OF(region);
 197     return true;
 198 }
 199
 200 bool wxRegion::DoSubtract(const wxRegion& region)
 201 {
 202     AllocExclusive();
 203     M_REGION -= M_REGION_OF(region);
 204     return true;
 205 }
 206
 207 bool wxRegion::DoXor(const wxRegion& region)
 208 {
 209     AllocExclusive();
 210     MGLRegion rg1 = M_REGION + M_REGION_OF(region),
 211               rg2 = M_REGION & M_REGION_OF(region);
 212     M_REGION = rg1 - rg2;
 213     return true;
 214 }
 215
 216
 217 //-----------------------------------------------------------------------------
 218 // Tests
 219 //-----------------------------------------------------------------------------
 220
 221 // Does the region contain the point (x,y)?
 222 wxRegionContain wxRegion::DoContainsPoint(wxCoord x, wxCoord y) const
 223 {
 224     if (!m_refData)
 225         return wxOutRegion;
 226
 227     if (M_REGION.includes((int)x, (int)y))
 228         return wxInRegion;
 229     else
 230         return wxOutRegion;
 231 }
 232
 233 // Does the region contain the rectangle (x, y, w, h)?
 234 wxRegionContain wxRegion::DoContainsRect(const wxRect& r) const
 235 {
 236     if (!m_refData)
 237         return wxOutRegion;
 238
 239     MGLRect rect(r.x, r.y, r.GetRight() + 1, r.GetBottom() + 1);
 240     MGLRegion rg;
 241
 242     // 1) is the rectangle entirely covered by the region?
 243     rg = MGLRegion(rect) - M_REGION;
 244     if (rg.isEmpty())
 245         return wxInRegion;
 246
 247     // 2) is the rectangle completely outside the region?
 248     rg = M_REGION & rect; // intersection
 249     if (rg.isEmpty())
 250         return wxOutRegion;
 251
 252     // 3) neither case happened => it is partially covered:
 253     return wxPartRegion;
 254 }
 255
 256 ///////////////////////////////////////////////////////////////////////////////
 257 //                               wxRegionIterator                                 //
 258 ///////////////////////////////////////////////////////////////////////////////
 259
 260 #if wxUSE_THREADS
 261 static wxMutex *gs_mutexIterator;
 262
 263 class wxMglRegionModule : public wxModule
 264 {
 265 public:
 266     virtual bool OnInit()
 267     {
 268         gs_mutexIterator = new wxMutex();
 269         return true;
 270     }
 271     virtual void OnExit()
 272     {
 273         wxDELETE(gs_mutexIterator);
 274     }
 275
 276     DECLARE_DYNAMIC_CLASS(wxMglRegionModule)
 277 };
 278 IMPLEMENT_DYNAMIC_CLASS(wxMglRegionModule, wxModule)
 279 #endif
 280
 281 /*
 282  * Initialize empty iterator
 283  */
 284 wxRegionIterator::wxRegionIterator() : m_currentNode(NULL)
 285 {
 286     m_rects.DeleteContents(true);
 287 }
 288
 289 wxRegionIterator::~wxRegionIterator()
 290 {
 291 }
 292
 293 /*
 294  * Initialize iterator for region
 295  */
 296 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 297 {
 298     m_rects.DeleteContents(true);
 299     Reset(region);
 300 }
 301
 302 /*
 303  * Reset iterator for a new /e region.
 304  */
 305
 306
 307 static wxRegionRectList *gs_rectList;
 308
 309 static void MGLAPI wxMGL_region_callback(const rect_t *r)
 310 {
 311     gs_rectList->Append(new wxRect(r->left, r->top,
 312                                    r->right - r->left, r->bottom - r->top));
 313 }
 314
 315 void wxRegionIterator::Reset(const wxRegion& region)
 316 {
 317     m_currentNode = NULL;
 318     m_rects.Clear();
 319
 320     if (!region.Empty())
 321     {
 322 #if wxUSE_THREADS
 323         wxMutexLocker lock(*gs_mutexIterator);
 324 #endif
 325         gs_rectList = &m_rects;
 326         M_REGION_OF(region).traverse(wxMGL_region_callback);
 327         m_currentNode = m_rects.GetFirst();
 328     }
 329 }
 330
 331 /*
 332  * Increment iterator. The rectangle returned is the one after the
 333  * incrementation.
 334  */
 335 void wxRegionIterator::operator ++ ()
 336 {
 337     if (m_currentNode)
 338         m_currentNode = m_currentNode->GetNext();
 339 }
 340
 341 /*
 342  * Increment iterator. The rectangle returned is the one before the
 343  * incrementation.
 344  */
 345 void wxRegionIterator::operator ++ (int)
 346 {
 347     if (m_currentNode)
 348         m_currentNode = m_currentNode->GetNext();
 349 }
 350
 351 wxCoord wxRegionIterator::GetX() const
 352 {
 353     if (m_currentNode)
 354         return m_currentNode->GetData()->x;
 355     else
 356         return 0;
 357 }
 358
 359 wxCoord wxRegionIterator::GetY() const
 360 {
 361     if (m_currentNode)
 362         return m_currentNode->GetData()->y;
 363     else
 364         return 0;
 365 }
 366
 367 wxCoord wxRegionIterator::GetW() const
 368 {
 369     if (m_currentNode)
 370         return m_currentNode->GetData()->width;
 371     else
 372         return 0;
 373 }
 374
 375 wxCoord wxRegionIterator::GetH() const
 376 {
 377     if (m_currentNode)
 378         return m_currentNode->GetData()->height;
 379     else
 380         return 0;
 381 }