src/dfb/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:      src/dfb/region.cpp
   3 // Purpose:   Region handling for wxWidgets/DFB
   4 // Author:    Vaclav Slavik
   5 // Created:   2006-08-08
   6 // RCS-ID:    $Id$
   7 // Copyright: (c) 2006 REA Elektronik GmbH
   8 // Licence:   wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 #include "wx/region.h"
  19
  20 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  21 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
  22
  23 //-----------------------------------------------------------------------------
  24 // wxRegionRefData
  25 //-----------------------------------------------------------------------------
  26
  27 class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
  28 {
  29 public:
  30     wxRegionRefData() {}
  31     wxRegionRefData(const wxRect& rect) : m_rect(rect) {}
  32     wxRegionRefData(const wxRegionRefData& data) : m_rect(data.m_rect) {}
  33
  34     ~wxRegionRefData() {}
  35
  36     // default assignment and comparison operators are OK
  37
  38     wxRect m_rect;
  39 };
  40
  41 #define M_REGION_OF(r) ((wxRegionRefData*)((r).m_refData))
  42 #define M_REGION       M_REGION_OF(*this)
  43
  44 //-----------------------------------------------------------------------------
  45 // wxRegion
  46 //-----------------------------------------------------------------------------
  47
  48 wxGDIRefData *wxRegion::CreateGDIRefData() const
  49 {
  50     return new wxRegionRefData;
  51 }
  52
  53 wxGDIRefData *wxRegion::CloneGDIRefData(const wxGDIRefData *data) const
  54 {
  55     return new wxRegionRefData(*(wxRegionRefData *)data);
  56 }
  57
  58 wxRegion::wxRegion()
  59 {
  60     m_refData = NULL;
  61 }
  62
  63 wxRegion::wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
  64 {
  65     m_refData = new wxRegionRefData(wxRect(x, y, w, h));
  66 }
  67
  68 wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
  69 {
  70     m_refData = new wxRegionRefData(wxRect(topLeft, bottomRight));
  71 }
  72
  73 wxRegion::wxRegion(const wxRect& r)
  74 {
  75     m_refData = new wxRegionRefData(r);
  76 }
  77
  78 wxRegion::~wxRegion()
  79 {
  80     // m_refData unrefed in ~wxObject
  81 }
  82
  83 //-----------------------------------------------------------------------------
  84 // Information about the region
  85 //-----------------------------------------------------------------------------
  86
  87 bool wxRegion::DoIsEqual(const wxRegion& region) const
  88 {
  89     return M_REGION->m_rect == M_REGION_OF(region)->m_rect;
  90 }
  91
  92 bool wxRegion::DoGetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
  93 {
  94     if ( !m_refData )
  95         return false;
  96
  97     const wxRect& r = M_REGION->m_rect;
  98     x = r.GetX();
  99     y = r.GetY();
 100     w = r.GetWidth();
 101     h = r.GetHeight();
 102
 103     return true;
 104 }
 105
 106 bool wxRegion::IsEmpty() const
 107 {
 108     if (!m_refData)
 109         return true;
 110
 111     return M_REGION->m_rect.IsEmpty();
 112 }
 113
 114 //-----------------------------------------------------------------------------
 115 // Modifications
 116 //-----------------------------------------------------------------------------
 117
 118 void wxRegion::Clear()
 119 {
 120     UnRef();
 121 }
 122
 123 bool wxRegion::DoOffset(wxCoord x, wxCoord y)
 124 {
 125     AllocExclusive();
 126     M_REGION->m_rect.Offset(x, y);
 127     return true;
 128 }
 129
 130 bool wxRegion::DoUnionWithRect(const wxRect& rect)
 131 {
 132     AllocExclusive();
 133
 134     if ( M_REGION->m_rect.Contains(rect) )
 135     {
 136         return true;
 137     }
 138     else if ( rect.Contains(M_REGION->m_rect) )
 139     {
 140         M_REGION->m_rect = rect;
 141         return true;
 142     }
 143     else
 144     {
 145         wxFAIL_MSG( "only rectangular regions are supported" );
 146         return false;
 147     }
 148 }
 149
 150 bool wxRegion::DoUnionWithRegion(const wxRegion& region)
 151 {
 152     wxCHECK_MSG( region.IsOk(), false, "invalid region" );
 153     return DoUnionWithRect(M_REGION_OF(region)->m_rect);
 154 }
 155
 156 bool wxRegion::DoIntersect(const wxRegion& region)
 157 {
 158     wxCHECK_MSG( region.IsOk(), false, "invalid region" );
 159
 160     AllocExclusive();
 161     M_REGION->m_rect.Intersect(M_REGION_OF(region)->m_rect);
 162     return true;
 163 }
 164
 165 bool wxRegion::DoSubtract(const wxRegion& region)
 166 {
 167     wxCHECK_MSG( region.IsOk(), false, "invalid region" );
 168     wxCHECK_MSG( IsOk(), false, "invalid region" );
 169
 170     const wxRect& rect = M_REGION_OF(region)->m_rect;
 171
 172     if ( rect.Contains(M_REGION->m_rect) )
 173     {
 174         // subtracted rectangle contains this one, so the result is empty
 175         // rectangle
 176         M_REGION->m_rect = wxRect();
 177         return true;
 178     }
 179     else if ( !M_REGION->m_rect.Intersects(rect) )
 180     {
 181         // the rectangles are disjoint, so subtracting has no effect
 182         return true;
 183     }
 184     else
 185     {
 186         wxFAIL_MSG( "only rectangular regions implemented" );
 187         return false;
 188     }
 189 }
 190
 191 bool wxRegion::DoXor(const wxRegion& region)
 192 {
 193     wxCHECK_MSG( region.IsOk(), false, "invalid region" );
 194     wxFAIL_MSG( "Xor not implemented" );
 195     return false;
 196 }
 197
 198
 199 //-----------------------------------------------------------------------------
 200 // Tests
 201 //-----------------------------------------------------------------------------
 202
 203 wxRegionContain wxRegion::DoContainsPoint(wxCoord x, wxCoord y) const
 204 {
 205     wxCHECK_MSG( IsOk(), wxOutRegion, "invalid region" );
 206
 207     if (M_REGION->m_rect.Contains(x, y))
 208         return wxInRegion;
 209     else
 210         return wxOutRegion;
 211 }
 212
 213 wxRegionContain wxRegion::DoContainsRect(const wxRect& rect) const
 214 {
 215     wxCHECK_MSG( IsOk(), wxOutRegion, "invalid region" );
 216
 217     // 1) is the rectangle entirely covered by the region?
 218     if (M_REGION->m_rect.Contains(rect))
 219         return wxInRegion;
 220
 221     // 2) is the rectangle completely outside the region?
 222     if (!M_REGION->m_rect.Intersects(rect))
 223         return wxOutRegion;
 224
 225     // 3) neither case happened => it is partially covered:
 226     return wxPartRegion;
 227 }
 228
 229 //-----------------------------------------------------------------------------
 230 // wxRegionIterator
 231 //-----------------------------------------------------------------------------
 232
 233 void wxRegionIterator::Reset(const wxRegion& region)
 234 {
 235     wxRegionRefData *d = M_REGION_OF(region);
 236     m_rect = d ? d->m_rect : wxRect();
 237 }
 238
 239 wxRegionIterator& wxRegionIterator::operator++()
 240 {
 241     // there's only one rectangle in the iterator, so iterating always
 242     // reaches the end:
 243     Reset();
 244     return *this;
 245 }
 246
 247 wxRegionIterator wxRegionIterator::operator++(int)
 248 {
 249     wxRegionIterator tmp = *this;
 250
 251     // there's only one rectangle in the iterator, so iterating always
 252     // reaches the end:
 253     Reset();
 254
 255     return tmp;
 256 }