X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/bf57d1adacf489fb1a9a2167b909b279cdf3e0f6..0d53638f7147c18153f63fdfc096b17be6e22a27:/src/gtk/region.cpp

diff --git a/src/gtk/region.cpp b/src/gtk/region.cpp
index 3003e15b58..af0d73628e 100644
--- a/src/gtk/region.cpp
+++ b/src/gtk/region.cpp
@@ -1,337 +1,419 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        region.cpp
+// Name:        src/gtk/region.cpp
 // Purpose:
 // Author:      Robert Roebling
-// Id:          $Id$
+// Modified:    VZ at 05.10.00: use AllocExclusive(), comparison fixed
 // Copyright:   (c) 1998 Robert Roebling
-// Licence:   	wxWindows licence
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "region.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
 
-#include "wx/region.h"
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
 
-#include "gdk/gdk.h"
-#include "gtk/gtk.h"
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
 
-#ifdef __WXDEBUG__
-#ifdef NULL
-#undef NULL
-#endif
-#define NULL ((void*)0L)
-#endif
+#include "wx/region.h"
+
+#include <gdk/gdk.h>
 
-//-----------------------------------------------------------------------------
-// wxRegion
-//-----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// wxRegionRefData: private class containing the information about the region
+// ----------------------------------------------------------------------------
 
-class wxRegionRefData: public wxObjectRefData
+class wxRegionRefData : public wxGDIRefData
 {
-  public:
-  
-    wxRegionRefData();
-    ~wxRegionRefData();
-  
-  public:    
+public:
+    wxRegionRefData()
+    {
+        m_region = NULL;
+    }
 
+    wxRegionRefData(const wxRegionRefData& refData)
+        : wxGDIRefData()
+    {
+#ifdef __WXGTK3__
+        m_region = cairo_region_copy(refData.m_region);
+#else
+        m_region = gdk_region_copy(refData.m_region);
+#endif
+    }
+
+    virtual ~wxRegionRefData()
+    {
+        if (m_region)
+        {
+#ifdef __WXGTK3__
+            cairo_region_destroy(m_region);
+#else
+            gdk_region_destroy( m_region );
+#endif
+        }
+    }
+
+#ifdef __WXGTK3__
+    cairo_region_t* m_region;
+#else
     GdkRegion  *m_region;
-    wxList      m_rects;
+#endif
 };
 
-wxRegionRefData::wxRegionRefData()
-{
-    m_region = (GdkRegion *) NULL;
-}
+// ----------------------------------------------------------------------------
+// macros
+// ----------------------------------------------------------------------------
 
-wxRegionRefData::~wxRegionRefData()
-{
-    if (m_region) gdk_region_destroy( m_region );
-  
-    wxNode *node = m_rects.First();
-    while (node)
-    {
-        wxRect *r = (wxRect*)node->Data();
-        delete r;
-        node = node->Next();
-    }
-}
+#define M_REGIONDATA static_cast<wxRegionRefData*>(m_refData)
+#define M_REGIONDATA_OF(r) static_cast<wxRegionRefData*>(r.m_refData)
 
-//-----------------------------------------------------------------------------
+IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
+IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator,wxObject)
 
-#define M_REGIONDATA ((wxRegionRefData *)m_refData)
+// ----------------------------------------------------------------------------
+// wxRegion construction
+// ----------------------------------------------------------------------------
 
-IMPLEMENT_DYNAMIC_CLASS(wxRegion,wxGDIObject);
-  
-wxRegion::wxRegion( long x, long y, long w, long h )
+void wxRegion::InitRect(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 {
-    m_refData = new wxRegionRefData();
-    GdkRegion *reg = gdk_region_new();
     GdkRectangle rect;
     rect.x = x;
     rect.y = y;
     rect.width = w;
     rect.height = h;
-    M_REGIONDATA->m_region = gdk_region_union_with_rect( reg, &rect );
-    gdk_region_destroy( reg );
-    M_REGIONDATA->m_rects.Append( (wxObject*) new wxRect(x,y,w,h) );
-}
 
-wxRegion::wxRegion( const wxPoint& topLeft, const wxPoint& bottomRight )
-{
     m_refData = new wxRegionRefData();
-    GdkRegion *reg = gdk_region_new();
-    GdkRectangle rect;
-    rect.x = topLeft.x;
-    rect.y = topLeft.y;
-    rect.width = bottomRight.x - rect.x;
-    rect.height = bottomRight.y - rect.y;
-    M_REGIONDATA->m_region = gdk_region_union_with_rect( reg, &rect );
-    gdk_region_destroy( reg );
-    M_REGIONDATA->m_rects.Append( (wxObject*) new wxRect(topLeft,bottomRight) );
+
+#ifdef __WXGTK3__
+    M_REGIONDATA->m_region = cairo_region_create_rectangle(&rect);
+#else
+    M_REGIONDATA->m_region = gdk_region_rectangle( &rect );
+#endif
 }
 
-wxRegion::wxRegion( const wxRect& rect )
+#ifndef __WXGTK3__
+wxRegion::wxRegion(const GdkRegion* region)
 {
     m_refData = new wxRegionRefData();
-    GdkRegion *reg = gdk_region_new();
-    GdkRectangle g_rect;
-    g_rect.x = rect.x;
-    g_rect.y = rect.y;
-    g_rect.width = rect.width;
-    g_rect.height = rect.height;
-    M_REGIONDATA->m_region = gdk_region_union_with_rect( reg, &g_rect );
-    gdk_region_destroy( reg );
-  
-    wxNode *node = M_REGIONDATA->m_rects.First();
-    while (node)
+    M_REGIONDATA->m_region = gdk_region_copy(const_cast<GdkRegion*>(region));
+}
+#endif
+
+wxRegion::wxRegion( size_t n, const wxPoint *points,
+                    wxPolygonFillMode fillStyle )
+{
+#ifdef __WXGTK3__
+    // Make a cairo path from the points, draw it onto an image surface, use
+    // gdk_cairo_region_create_from_surface() to get a cairo region
+
+    // need at least 3 points to make a useful polygon
+    if (n < 3)
+        return;
+    // get bounding rect
+    int min_x = points[0].x;
+    int max_x = min_x;
+    int min_y = points[0].y;
+    int max_y = min_y;
+    size_t i;
+    for (i = 1; i < n; i++)
     {
-        wxRect *r = (wxRect*)node->Data();
-        M_REGIONDATA->m_rects.Append( (wxObject*) new wxRect(r->x,r->y,r->width,r->height) );
-        node = node->Next();
+        const int x = points[i].x;
+        if (min_x > x)
+            min_x = x;
+        else if (max_x < x)
+            max_x = x;
+        const int y = points[i].y;
+        if (min_y > y)
+            min_y = y;
+        else if (max_y < y)
+            max_y = y;
+    }
+    const int w = max_x - min_x + 1;
+    const int h = max_y - min_y + 1;
+    // make surface just big enough to contain polygon (A1 is native format
+    //   for gdk_cairo_region_create_from_surface)
+    cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_A1, w, h);
+    memset(cairo_image_surface_get_data(surface), 0, cairo_image_surface_get_stride(surface) * h);
+    cairo_surface_mark_dirty(surface);
+    cairo_surface_set_device_offset(surface, -min_x, -min_y);
+    cairo_t* cr = cairo_create(surface);
+    cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
+    if (fillStyle == wxODDEVEN_RULE)
+        cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
+    // make path
+    cairo_move_to(cr, points[0].x, points[0].y);
+    for (i = 1; i < n; i++)
+        cairo_line_to(cr, points[i].x, points[i].y);
+    cairo_close_path(cr);
+    cairo_fill(cr);
+    cairo_destroy(cr);
+    cairo_surface_flush(surface);
+    m_refData = new wxRegionRefData;
+    M_REGIONDATA->m_region = gdk_cairo_region_create_from_surface(surface);
+    cairo_surface_destroy(surface);
+#else
+    GdkPoint *gdkpoints = new GdkPoint[n];
+    for ( size_t i = 0 ; i < n ; i++ )
+    {
+        gdkpoints[i].x = points[i].x;
+        gdkpoints[i].y = points[i].y;
     }
-}
 
-wxRegion::wxRegion()
-{
     m_refData = new wxRegionRefData();
-    M_REGIONDATA->m_region = gdk_region_new();
+
+    GdkRegion* reg = gdk_region_polygon
+                     (
+                        gdkpoints,
+                        n,
+                        fillStyle == wxWINDING_RULE ? GDK_WINDING_RULE
+                                                    : GDK_EVEN_ODD_RULE
+                     );
+
+    M_REGIONDATA->m_region = reg;
+
+    delete [] gdkpoints;
+#endif
 }
 
 wxRegion::~wxRegion()
 {
+    // m_refData unrefed in ~wxObject
 }
 
-bool wxRegion::operator == ( const wxRegion& region )
+wxGDIRefData *wxRegion::CreateGDIRefData() const
 {
-    return m_refData == region.m_refData; 
+    // should never be called
+    wxFAIL;
+    return NULL;
 }
 
-bool wxRegion::operator != ( const wxRegion& region )
+wxGDIRefData *wxRegion::CloneGDIRefData(const wxGDIRefData *data) const
 {
-    return m_refData != region.m_refData; 
+    return new wxRegionRefData(*static_cast<const wxRegionRefData*>(data));
 }
 
-void wxRegion::Clear()
-{
-    UnRef();
-    m_refData = new wxRegionRefData();
-    M_REGIONDATA->m_region = gdk_region_new();
-}
+// ----------------------------------------------------------------------------
+// wxRegion comparison
+// ----------------------------------------------------------------------------
 
-bool wxRegion::Union( long x, long y, long width, long height )
+bool wxRegion::DoIsEqual(const wxRegion& region) const
 {
-    GdkRectangle rect;
-    rect.x = x;
-    rect.y = y;
-    rect.width = width;
-    rect.height = height;
-    GdkRegion *reg = gdk_region_union_with_rect( M_REGIONDATA->m_region, &rect );
-    gdk_region_destroy( M_REGIONDATA->m_region );
-    M_REGIONDATA->m_region = reg;
-    M_REGIONDATA->m_rects.Append( (wxObject*) new wxRect(x,y,width,height) );
-    return TRUE;
+#ifdef __WXGTK3__
+    return cairo_region_equal(
+        M_REGIONDATA->m_region, M_REGIONDATA_OF(region)->m_region);
+#else
+    return gdk_region_equal(M_REGIONDATA->m_region,
+                            M_REGIONDATA_OF(region)->m_region) != 0;
+#endif
 }
 
-bool wxRegion::Union( const wxRect& rect )
+// ----------------------------------------------------------------------------
+// wxRegion operations
+// ----------------------------------------------------------------------------
+
+void wxRegion::Clear()
 {
-    GdkRectangle g_rect;
-    g_rect.x = rect.x;
-    g_rect.y = rect.y;
-    g_rect.width = rect.width;
-    g_rect.height = rect.height;
-    GdkRegion *reg = gdk_region_union_with_rect( M_REGIONDATA->m_region, &g_rect );
-    gdk_region_destroy( M_REGIONDATA->m_region );
-    M_REGIONDATA->m_region = reg;
-    M_REGIONDATA->m_rects.Append( (wxObject*) new wxRect(rect.x,rect.y,rect.width,rect.height) );
-    return TRUE;
+    UnRef();
 }
 
-bool wxRegion::Union( const wxRegion& region )
+bool wxRegion::DoUnionWithRect(const wxRect& r)
 {
-    GdkRegion *reg = gdk_regions_union( M_REGIONDATA->m_region, region.GetRegion() );
-    gdk_region_destroy( M_REGIONDATA->m_region );
-    M_REGIONDATA->m_region = reg;
-  
-    wxNode *node = region.GetRectList()->First();
-    while (node)
+    // workaround for a strange GTK/X11 bug: taking union with an empty
+    // rectangle results in an empty region which is definitely not what we
+    // want
+    if ( r.IsEmpty() )
+        return true;
+
+    if ( !m_refData )
     {
-        wxRect *r = (wxRect*)node->Data();
-        M_REGIONDATA->m_rects.Append( (wxObject*) new wxRect(r->x,r->y,r->width,r->height) );
-        node = node->Next();
+        InitRect(r.x, r.y, r.width, r.height);
+    }
+    else
+    {
+        AllocExclusive();
+
+        GdkRectangle rect;
+        rect.x = r.x;
+        rect.y = r.y;
+        rect.width = r.width;
+        rect.height = r.height;
+
+#ifdef __WXGTK3__
+        cairo_region_union_rectangle(M_REGIONDATA->m_region, &rect);
+#else
+        gdk_region_union_with_rect( M_REGIONDATA->m_region, &rect );
+#endif
     }
-  
-    return TRUE;
-}
 
-bool wxRegion::Intersect( long x, long y, long width, long height )
-{
-    wxRegion reg( x, y, width, height );
-    Intersect( reg );
-    return TRUE;
+    return true;
 }
 
-bool wxRegion::Intersect( const wxRect& rect )
+bool wxRegion::DoUnionWithRegion( const wxRegion& region )
 {
-    wxRegion reg( rect );
-    Intersect( reg );
-    return TRUE;
-}
+    if (region.m_refData == NULL)
+        { }
+    else if (m_refData == NULL)
+    {
+        m_refData = new wxRegionRefData(*M_REGIONDATA_OF(region));
+    }
+    else
+    {
+        AllocExclusive();
+#ifdef __WXGTK3__
+        cairo_region_union(M_REGIONDATA->m_region, M_REGIONDATA_OF(region)->m_region);
+#else
+        gdk_region_union( M_REGIONDATA->m_region, region.GetRegion() );
+#endif
+    }
 
-bool wxRegion::Intersect( const wxRegion& region )
-{
-    GdkRegion *reg = gdk_regions_intersect( M_REGIONDATA->m_region, region.GetRegion() );
-    gdk_region_destroy( M_REGIONDATA->m_region );
-    M_REGIONDATA->m_region = reg;
-    return TRUE;
+    return true;
 }
 
-bool wxRegion::Subtract( long x, long y, long width, long height )
+bool wxRegion::DoIntersect( const wxRegion& region )
 {
-    wxRegion reg( x, y, width, height );
-    Subtract( reg );
-    return TRUE;
-}
+    if (region.m_refData == NULL || m_refData == NULL)
+        return false;
 
-bool wxRegion::Subtract( const wxRect& rect )
-{
-    wxRegion reg( rect );
-    Subtract( reg );
-    return TRUE;
+    AllocExclusive();
+
+#ifdef __WXGTK3__
+    cairo_region_intersect(M_REGIONDATA->m_region, M_REGIONDATA_OF(region)->m_region);
+#else
+    gdk_region_intersect( M_REGIONDATA->m_region, region.GetRegion() );
+#endif
+
+    return true;
 }
 
-bool wxRegion::Subtract( const wxRegion& region )
+bool wxRegion::DoSubtract( const wxRegion& region )
 {
-    GdkRegion *reg = gdk_regions_subtract( M_REGIONDATA->m_region, region.GetRegion() );
-    gdk_region_destroy( M_REGIONDATA->m_region );
-    M_REGIONDATA->m_region = reg;
-    return TRUE;
+    if (region.m_refData == NULL || m_refData == NULL)
+        return false;
+
+    AllocExclusive();
+
+#ifdef __WXGTK3__
+    cairo_region_subtract(M_REGIONDATA->m_region, M_REGIONDATA_OF(region)->m_region);
+#else
+    gdk_region_subtract( M_REGIONDATA->m_region, region.GetRegion() );
+#endif
+
+    return true;
 }
 
-bool wxRegion::Xor( long x, long y, long width, long height )
+bool wxRegion::DoXor( const wxRegion& region )
 {
-    wxRegion reg( x, y, width, height );
-    Xor( reg );
-    return TRUE;
+    if (region.m_refData == NULL)
+        { }
+    else if (m_refData == NULL)
+    {
+        // XOR-ing with an invalid region is the same as XOR-ing with an empty
+        // one, i.e. it is simply a copy.
+        m_refData = new wxRegionRefData(*M_REGIONDATA_OF(region));
+    }
+    else
+    {
+        AllocExclusive();
+
+#ifdef __WXGTK3__
+        cairo_region_xor(M_REGIONDATA->m_region, M_REGIONDATA_OF(region)->m_region);
+#else
+        gdk_region_xor( M_REGIONDATA->m_region, region.GetRegion() );
+#endif
+    }
+
+    return true;
 }
 
-bool wxRegion::Xor( const wxRect& rect )
+bool wxRegion::DoOffset( wxCoord x, wxCoord y )
 {
-    wxRegion reg( rect );
-    Xor( reg );
-    return TRUE;
+    wxCHECK_MSG( m_refData, false, wxS("invalid region") );
+
+    AllocExclusive();
+
+#ifdef __WXGTK3__
+    cairo_region_translate(M_REGIONDATA->m_region, x, y);
+#else
+    gdk_region_offset( M_REGIONDATA->m_region, x, y );
+#endif
+
+    return true;
 }
 
-bool wxRegion::Xor( const wxRegion& region )
+// ----------------------------------------------------------------------------
+// wxRegion tests
+// ----------------------------------------------------------------------------
+
+bool wxRegion::DoGetBox( wxCoord &x, wxCoord &y, wxCoord &w, wxCoord &h ) const
 {
-    GdkRegion *reg = gdk_regions_xor( M_REGIONDATA->m_region, region.GetRegion() );
-    gdk_region_destroy( M_REGIONDATA->m_region );
-    M_REGIONDATA->m_region = reg;
-  
-    wxNode *node = region.GetRectList()->First();
-    while (node)
+    if ( m_refData )
     {
-        wxRect *r = (wxRect*)node->Data();
-        M_REGIONDATA->m_rects.Append( (wxObject*) new wxRect(r->x,r->y,r->width,r->height) );
-        node = node->Next();
-    }
-  
-    return TRUE;
-}
+        GdkRectangle rect;
+#ifdef __WXGTK3__
+        cairo_region_get_extents(M_REGIONDATA->m_region, &rect);
+#else
+        gdk_region_get_clipbox( M_REGIONDATA->m_region, &rect );
+#endif
+        x = rect.x;
+        y = rect.y;
+        w = rect.width;
+        h = rect.height;
 
-void wxRegion::GetBox( long& x, long& y, long&w, long &h ) const
-{
-    x = 0;
-    y = 0;
-    w = -1;
-    h = -1;
-    wxNode *node = GetRectList()->First();
-    while (node)
+        return true;
+    }
+    else
     {
-        wxRect *r = (wxRect*)node->Data();
-        if (node == GetRectList()->First())
-        {
-            x = r->x;
-            y = r->y;
-            w = r->width;
-            h = r->height;
-        }
-        else
-        {
-            if (r->x < x)
-            {
-                x = r->x;
-                w += x - r->x;
-            }
-            if (r->y < y) 
-            {
-                y = r->y;
-                h += y - r->y;
-            }
-            if (r->width+r->x > x+w) 
-            {
-                w = r->x + r->width - x;
-            }
-            if (r->height+r->y > y+h) 
-            {
-                h = r->y + r->height - y;
-            }
-        }
-        node = node->Next();
+        x = 0;
+        y = 0;
+        w = -1;
+        h = -1;
+
+        return false;
     }
 }
 
-wxRect wxRegion::GetBox() const
+bool wxRegion::IsEmpty() const
 {
-    long x = 0;
-    long y = 0;
-    long w = -1;
-    long h = -1;
-    GetBox( x, y, w, h );
-    return wxRect( x, y, w, h );
+#ifdef __WXGTK3__
+    return m_refData == NULL || cairo_region_is_empty(M_REGIONDATA->m_region);
+#else
+    return m_refData == NULL || gdk_region_empty(M_REGIONDATA->m_region);
+#endif
 }
 
-bool wxRegion::Empty() const
+wxRegionContain wxRegion::DoContainsPoint( wxCoord x, wxCoord y ) const
 {
-    return gdk_region_empty( M_REGIONDATA->m_region );
+#ifdef __WXGTK3__
+    if (m_refData == NULL || !cairo_region_contains_point(M_REGIONDATA->m_region, x, y))
+#else
+    if (m_refData == NULL || !gdk_region_point_in(M_REGIONDATA->m_region, x, y))
+#endif
+        return wxOutRegion;
+
+    return wxInRegion;
 }
 
-wxRegionContain wxRegion::Contains( long x, long y ) const
+wxRegionContain wxRegion::DoContainsRect(const wxRect& r) const
 {
-    if (gdk_region_point_in( M_REGIONDATA->m_region, x, y ))
-        return wxInRegion;
-    else
+    if (!m_refData)
         return wxOutRegion;
-}
 
-wxRegionContain wxRegion::Contains( long x, long y, long w, long h ) const
-{
     GdkRectangle rect;
-    rect.x = x;
-    rect.y = y;
-    rect.width = w;
-    rect.height = h;
+    rect.x = r.x;
+    rect.y = r.y;
+    rect.width = r.width;
+    rect.height = r.height;
+#ifdef __WXGTK3__
+    switch (cairo_region_contains_rectangle(M_REGIONDATA->m_region, &rect))
+    {
+        case CAIRO_REGION_OVERLAP_IN:   return wxInRegion;
+        case CAIRO_REGION_OVERLAP_PART: return wxPartRegion;
+        default: break;
+    }
+#else
     GdkOverlapType res = gdk_region_rect_in( M_REGIONDATA->m_region, &rect );
     switch (res)
     {
@@ -339,102 +421,179 @@ wxRegionContain wxRegion::Contains( long x, long y, long w, long h ) const
         case GDK_OVERLAP_RECTANGLE_OUT:  return wxOutRegion;
         case GDK_OVERLAP_RECTANGLE_PART: return wxPartRegion;
     }
+#endif
     return wxOutRegion;
 }
 
-wxRegionContain wxRegion::Contains(const wxPoint& pt) const
+#ifdef __WXGTK3__
+cairo_region_t* wxRegion::GetRegion() const
+#else
+GdkRegion *wxRegion::GetRegion() const
+#endif
 {
-    return Contains( pt.x, pt.y );
+    if (!m_refData)
+        return NULL;
+
+    return M_REGIONDATA->m_region;
 }
 
-wxRegionContain wxRegion::Contains(const wxRect& rect) const
+// ----------------------------------------------------------------------------
+// wxRegionIterator
+// ----------------------------------------------------------------------------
+
+wxRegionIterator::wxRegionIterator()
 {
-    return Contains( rect.x, rect.y, rect.width, rect.height );
+    Init();
+    Reset();
 }
 
-GdkRegion *wxRegion::GetRegion() const
+wxRegionIterator::wxRegionIterator( const wxRegion& region )
 {
-    return M_REGIONDATA->m_region;
+    Init();
+    Reset(region);
 }
 
-wxList *wxRegion::GetRectList() const
+void wxRegionIterator::Init()
 {
-    return &(M_REGIONDATA->m_rects);
+    m_rects = NULL;
+    m_numRects = 0;
 }
 
-//-----------------------------------------------------------------------------
-// wxRegion
-//-----------------------------------------------------------------------------
-
-IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator,wxObject);
-  
-wxRegionIterator::wxRegionIterator()
+wxRegionIterator::~wxRegionIterator()
 {
-    m_current = 0;
+    wxDELETEA(m_rects);
 }
 
-wxRegionIterator::wxRegionIterator( const wxRegion& region )
+void wxRegionIterator::CreateRects( const wxRegion& region )
 {
-    m_region = region;
-    m_current = 0;
+    wxDELETEA(m_rects);
+    m_numRects = 0;
+
+#ifdef __WXGTK3__
+    cairo_region_t* cairoRegion = region.GetRegion();
+    if (cairoRegion == NULL)
+        return;
+    m_numRects = cairo_region_num_rectangles(cairoRegion);
+     
+    if (m_numRects)
+    {
+        m_rects = new wxRect[m_numRects];
+        for (int i = 0; i < m_numRects; i++)
+        {
+            GdkRectangle gr;
+            cairo_region_get_rectangle(cairoRegion, i, &gr);
+            wxRect &wr = m_rects[i];
+            wr.x = gr.x;
+            wr.y = gr.y;
+            wr.width = gr.width;
+            wr.height = gr.height;
+        }
+    }
+#else
+    GdkRegion *gdkregion = region.GetRegion();
+    if (!gdkregion)
+        return;
+
+    GdkRectangle* gdkrects;
+    gdk_region_get_rectangles(gdkregion, &gdkrects, &m_numRects);
+
+    if (m_numRects)
+    {
+        m_rects = new wxRect[m_numRects];
+        for (int i = 0; i < m_numRects; ++i)
+        {
+            GdkRectangle &gr = gdkrects[i];
+            wxRect &wr = m_rects[i];
+            wr.x = gr.x;
+            wr.y = gr.y;
+            wr.width = gr.width;
+            wr.height = gr.height;
+        }
+    }
+    g_free( gdkrects );
+#endif
 }
 
 void wxRegionIterator::Reset( const wxRegion& region )
 {
     m_region = region;
-    m_current = 0;
-}
-
-wxRegionIterator::operator bool () const 
-{ 
-    return m_current < m_region.GetRectList()->Number(); 
+    CreateRects(region);
+    Reset();
 }
 
-bool wxRegionIterator::HaveRects() const 
-{ 
-    return m_current < m_region.GetRectList()->Number(); 
+bool wxRegionIterator::HaveRects() const
+{
+    return m_current < m_numRects;
 }
 
-void wxRegionIterator::operator ++ ()
+wxRegionIterator& wxRegionIterator::operator ++ ()
 {
-    if (m_current < m_region.GetRectList()->Number()) ++m_current;
+    if (HaveRects())
+        ++m_current;
+
+    return *this;
 }
 
-void wxRegionIterator::operator ++ (int)
+wxRegionIterator wxRegionIterator::operator ++ (int)
 {
-    if (m_current < m_region.GetRectList()->Number()) ++m_current;
+    wxRegionIterator tmp = *this;
+
+    if (HaveRects())
+        ++m_current;
+
+    return tmp;
 }
 
 wxCoord wxRegionIterator::GetX() const
 {
-    wxNode *node = m_region.GetRectList()->Nth( m_current );
-    if (!node) return 0;
-    wxRect *r = (wxRect*)node->Data();
-    return r->x;
+    wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
+
+    return m_rects[m_current].x;
 }
 
 wxCoord wxRegionIterator::GetY() const
 {
-    wxNode *node = m_region.GetRectList()->Nth( m_current );
-    if (!node) return 0;
-    wxRect *r = (wxRect*)node->Data();
-    return r->y;
+    wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
+
+    return m_rects[m_current].y;
 }
 
 wxCoord wxRegionIterator::GetW() const
 {
-    wxNode *node = m_region.GetRectList()->Nth( m_current );
-    if (!node) return 0;
-    wxRect *r = (wxRect*)node->Data();
-    return r->width;
+    wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
+
+    return m_rects[m_current].width;
 }
 
 wxCoord wxRegionIterator::GetH() const
 {
-    wxNode *node = m_region.GetRectList()->Nth( m_current );
-    if (!node) return 0;
-    wxRect *r = (wxRect*)node->Data();
-    return r->height;
+    wxCHECK_MSG( HaveRects(), 0, wxT("invalid wxRegionIterator") );
+
+    return m_rects[m_current].height;
 }
 
+wxRect wxRegionIterator::GetRect() const
+{
+    wxRect r;
+    if( HaveRects() )
+        r = m_rects[m_current];
+
+    return r;
+}
+
+wxRegionIterator& wxRegionIterator::operator=(const wxRegionIterator& ri)
+{
+    if (this != &ri)
+    {
+        wxDELETEA(m_rects);
 
+        m_current = ri.m_current;
+        m_numRects = ri.m_numRects;
+        if ( m_numRects )
+        {
+            m_rects = new wxRect[m_numRects];
+            memcpy(m_rects, ri.m_rects, m_numRects * sizeof m_rects[0]);
+        }
+    }
+    return *this;
+}