X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/0ebd9515e5df4a756d27eea9ea9ee9ac193dd7bd..a66bf817a6ba833ad47cefc9fa8948ef8045a59d:/src/common/dcgraph.cpp

diff --git a/src/common/dcgraph.cpp b/src/common/dcgraph.cpp
index c9889d2d39..f787932c21 100644
--- a/src/common/dcgraph.cpp
+++ b/src/common/dcgraph.cpp
@@ -1,9 +1,9 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        src/common/graphcmn.cpp
+// Name:        src/common/dcgraph.cpp
 // Purpose:     graphics context methods common to all platforms
 // Author:      Stefan Csomor
 // Modified by:
-// Created:     
+// Created:
 // RCS-ID:      $Id$
 // Copyright:   (c) Stefan Csomor
 // Licence:     wxWindows licence
@@ -18,13 +18,12 @@
 
 #if wxUSE_GRAPHICS_CONTEXT
 
-#include "wx/graphics.h"
+#include "wx/dcgraph.h"
 
 #ifndef WX_PRECOMP
     #include "wx/icon.h"
-    #include "wx/bitmap.h"
+    #include "wx/dcclient.h"
     #include "wx/dcmemory.h"
-    #include "wx/region.h"
 #endif
 
 //-----------------------------------------------------------------------------
@@ -42,43 +41,164 @@ static inline double DegToRad(double deg)
     return (deg * M_PI) / 180.0;
 }
 
+static wxCompositionMode TranslateRasterOp(wxRasterOperationMode function)
+{
+    switch ( function )
+    {
+        case wxCOPY: // src
+            // since we are supporting alpha, _OVER is closer to the intention than _SOURCE
+            // since the latter would overwrite even when alpha is not set to opaque
+            return wxCOMPOSITION_OVER;
+
+        case wxOR:         // src OR dst
+            return wxCOMPOSITION_ADD;
+
+        case wxNO_OP:      // dst
+            return wxCOMPOSITION_DEST; // ignore the source
+
+        case wxCLEAR:      // 0
+            return wxCOMPOSITION_CLEAR;// clear dst
+
+        case wxXOR:        // src XOR dst
+            return wxCOMPOSITION_XOR;
+
+        case wxAND:        // src AND dst
+        case wxAND_INVERT: // (NOT src) AND dst
+        case wxAND_REVERSE:// src AND (NOT dst)
+        case wxEQUIV:      // (NOT src) XOR dst
+        case wxINVERT:     // NOT dst
+        case wxNAND:       // (NOT src) OR (NOT dst)
+        case wxNOR:        // (NOT src) AND (NOT dst)
+        case wxOR_INVERT:  // (NOT src) OR dst
+        case wxOR_REVERSE: // src OR (NOT dst)
+        case wxSET:        // 1
+        case wxSRC_INVERT: // NOT src
+            break;
+    }
+
+    return wxCOMPOSITION_INVALID;
+}
+
 //-----------------------------------------------------------------------------
 // wxDC bridge class
 //-----------------------------------------------------------------------------
 
-#ifdef __WXMAC__
-IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDCBase)
-#else
 IMPLEMENT_DYNAMIC_CLASS(wxGCDC, wxDC)
+
+wxGCDC::wxGCDC(const wxWindowDC& dc) :
+  wxDC( new wxGCDCImpl( this, dc ) )
+{
+}
+
+wxGCDC::wxGCDC( const wxMemoryDC& dc) :
+  wxDC( new wxGCDCImpl( this, dc ) )
+{
+}
+
+#if wxUSE_PRINTING_ARCHITECTURE
+wxGCDC::wxGCDC( const wxPrinterDC& dc) :
+  wxDC( new wxGCDCImpl( this, dc ) )
+{
+}
 #endif
 
-wxGCDC::wxGCDC()
+#if defined(__WXMSW__) && wxUSE_ENH_METAFILE
+wxGCDC::wxGCDC(const wxEnhMetaFileDC& dc)
+   : wxDC(new wxGCDCImpl(this, dc))
+{
+}
+#endif
+
+wxGCDC::wxGCDC(wxGraphicsContext* context) :
+    wxDC( new wxGCDCImpl( this ) )
+{
+    SetGraphicsContext(context);
+}
+
+wxGCDC::wxGCDC() :
+  wxDC( new wxGCDCImpl( this ) )
+{
+}
+
+wxGCDC::~wxGCDC()
+{
+}
+
+wxGraphicsContext* wxGCDC::GetGraphicsContext() const
 {
-    Init();
+    if (!m_pimpl) return NULL;
+    wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
+    return gc_impl->GetGraphicsContext();
 }
 
 void wxGCDC::SetGraphicsContext( wxGraphicsContext* ctx )
-{ 
+{
+    if (!m_pimpl) return;
+    wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
+    gc_impl->SetGraphicsContext( ctx );
+}
+
+IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
+
+wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
+   wxDCImpl( owner )
+{
+    Init(wxGraphicsContext::Create());
+}
+
+void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
+{
     delete m_graphicContext;
     m_graphicContext = ctx;
-    m_matrixOriginal = m_graphicContext->GetTransform();
+    if ( m_graphicContext )
+    {
+        m_matrixOriginal = m_graphicContext->GetTransform();
+        m_ok = true;
+        // apply the stored transformations to the passed in context
+        ComputeScaleAndOrigin();
+        m_graphicContext->SetFont( m_font , m_textForegroundColour );
+        m_graphicContext->SetPen( m_pen );
+        m_graphicContext->SetBrush( m_brush);
+    }
+}
+
+wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
+   wxDCImpl( owner )
+{
+    Init(wxGraphicsContext::Create(dc));
+    m_window = dc.GetWindow();
+}
+
+wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
+   wxDCImpl( owner )
+{
+    Init(wxGraphicsContext::Create(dc));
+}
+
+#if wxUSE_PRINTING_ARCHITECTURE
+wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxPrinterDC& dc ) :
+   wxDCImpl( owner )
+{
+    Init(wxGraphicsContext::Create(dc));
+}
+#endif
+
+#if defined(__WXMSW__) && wxUSE_ENH_METAFILE
+wxGCDCImpl::wxGCDCImpl(wxDC *owner, const wxEnhMetaFileDC& dc)
+   : wxDCImpl(owner)
+{
+    Init(wxGraphicsContext::Create(dc));
 }
+#endif
 
-wxGCDC::wxGCDC(const wxWindowDC& dc)
+wxGCDCImpl::wxGCDCImpl(wxDC* owner, int)
+   : wxDCImpl(owner)
 {
-    Init();
-    m_graphicContext = wxGraphicsContext::Create(dc);
-    m_matrixOriginal = m_graphicContext->GetTransform();
-    m_ok = true;
-    if ( dc.GetFont().Ok())
-        m_graphicContext->SetFont( m_graphicContext->CreateFont(dc.GetFont(),dc.GetTextForeground()));
-    if ( dc.GetPen().Ok())
-        m_graphicContext->SetPen( m_graphicContext->CreatePen(dc.GetPen()));
-    if ( dc.GetBrush().Ok())
-        m_graphicContext->SetBrush( m_graphicContext->CreateBrush(dc.GetBrush()));
+    // derived class will set a context
+    Init(NULL);
 }
 
-void wxGCDC::Init()
+void wxGCDCImpl::Init(wxGraphicsContext* ctx)
 {
     m_ok = false;
     m_colour = true;
@@ -90,26 +210,51 @@ void wxGCDC::Init()
     m_brush = *wxWHITE_BRUSH;
 
     m_graphicContext = NULL;
-}
+    if (ctx)
+        SetGraphicsContext(ctx);
 
+    m_logicalFunctionSupported = true;
+}
 
-wxGCDC::~wxGCDC()
+wxGCDCImpl::~wxGCDCImpl()
 {
     delete m_graphicContext;
 }
 
-void wxGCDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
+void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y,
+                               bool useMask )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
-    wxCHECK_RET( bmp.Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
+    wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );
+
+    int w = bmp.GetScaledWidth();
+    int h = bmp.GetScaledHeight();
+    if ( bmp.GetDepth() == 1 )
+    {
+        m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
+        m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
+        m_graphicContext->DrawRectangle( x, y, w, h );
+        m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
+        m_graphicContext->DrawBitmap( bmp, x, y, w, h );
+        m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
+        m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
+    }
+    else // not a monochrome bitmap, handle it normally
+    {
+        // make a copy in case we need to remove its mask, if we don't modify
+        // it the copy is cheap as bitmaps are reference-counted
+        wxBitmap bmpCopy(bmp);
+        if ( !useMask && bmp.GetMask() )
+            bmpCopy.SetMask(NULL);
 
-    m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
+        m_graphicContext->DrawBitmap( bmpCopy, x, y, w, h );
+    }
 }
 
-void wxGCDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
+void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
-    wxCHECK_RET( icon.Ok(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid DC") );
+    wxCHECK_RET( icon.IsOk(), wxT("wxGCDC(cg)::DoDrawIcon - invalid icon") );
 
     wxCoord w = icon.GetWidth();
     wxCoord h = icon.GetHeight();
@@ -117,43 +262,55 @@ void wxGCDC::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
     m_graphicContext->DrawIcon( icon , x, y, w, h );
 }
 
-void wxGCDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
+bool wxGCDCImpl::StartDoc( const wxString& WXUNUSED(message) )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
+    return true;
+}
+
+void wxGCDCImpl::EndDoc()
+{
+}
+
+void wxGCDCImpl::StartPage()
+{
+}
+
+void wxGCDCImpl::EndPage()
+{
+}
+
+void wxGCDCImpl::Flush()
+{
+    m_graphicContext->Flush();
+}
+
+void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
+{
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
 
     m_graphicContext->Clip( x, y, w, h );
-    if ( m_clipping )
-    {
-        m_clipX1 = wxMax( m_clipX1, x );
-        m_clipY1 = wxMax( m_clipY1, y );
-        m_clipX2 = wxMin( m_clipX2, (x + w) );
-        m_clipY2 = wxMin( m_clipY2, (y + h) );
-    }
-    else
-    {
-        m_clipping = true;
 
-        m_clipX1 = x;
-        m_clipY1 = y;
-        m_clipX2 = x + w;
-        m_clipY2 = y + h;
-    }
+    wxDCImpl::DoSetClippingRegion(x, y, w, h);
 }
 
-void wxGCDC::DoSetClippingRegionAsRegion( const wxRegion &region )
+void wxGCDCImpl::DoSetDeviceClippingRegion( const wxRegion &region )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
+    // region is in device coordinates
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetDeviceClippingRegion - invalid DC") );
 
     if (region.Empty())
     {
-        DestroyClippingRegion();
+        //DestroyClippingRegion();
         return;
     }
 
+    wxRegion logRegion( region );
     wxCoord x, y, w, h;
-    region.GetBox( x, y, w, h );
 
-    m_graphicContext->Clip( region );
+    logRegion.Offset( DeviceToLogicalX(0), DeviceToLogicalY(0) );
+    logRegion.GetBox( x, y, w, h );
+
+    m_graphicContext->Clip( logRegion );
     if ( m_clipping )
     {
         m_clipX1 = wxMax( m_clipX1, x );
@@ -172,163 +329,113 @@ void wxGCDC::DoSetClippingRegionAsRegion( const wxRegion &region )
     }
 }
 
-void wxGCDC::DestroyClippingRegion()
+void wxGCDCImpl::DestroyClippingRegion()
 {
     m_graphicContext->ResetClip();
+    // currently the clip eg of a window extends to the area between the scrollbars
+    // so we must explicitly make sure it only covers the area we want it to draw
+    int width, height ;
+    GetOwner()->GetSize( &width , &height ) ;
+    m_graphicContext->Clip( DeviceToLogicalX(0) , DeviceToLogicalY(0) , DeviceToLogicalXRel(width), DeviceToLogicalYRel(height) );
+
     m_graphicContext->SetPen( m_pen );
     m_graphicContext->SetBrush( m_brush );
 
     m_clipping = false;
 }
 
-void wxGCDC::DoGetSizeMM( int* width, int* height ) const
+void wxGCDCImpl::DoGetSizeMM( int* width, int* height ) const
 {
     int w = 0, h = 0;
 
-    GetSize( &w, &h );
+    GetOwner()->GetSize( &w, &h );
     if (width)
         *width = long( double(w) / (m_scaleX * m_mm_to_pix_x) );
     if (height)
         *height = long( double(h) / (m_scaleY * m_mm_to_pix_y) );
 }
 
-void wxGCDC::SetTextForeground( const wxColour &col )
+void wxGCDCImpl::SetTextForeground( const wxColour &col )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextForeground - invalid DC") );
 
-    if ( col != m_textForegroundColour )
+    // don't set m_textForegroundColour to an invalid colour as we'd crash
+    // later then (we use m_textForegroundColour.GetColor() without checking
+    // in a few places)
+    if ( col.IsOk() )
     {
         m_textForegroundColour = col;
         m_graphicContext->SetFont( m_font, m_textForegroundColour );
     }
 }
 
-void wxGCDC::SetTextBackground( const wxColour &col )
+void wxGCDCImpl::SetTextBackground( const wxColour &col )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::SetTextBackground - invalid DC") );
 
     m_textBackgroundColour = col;
 }
 
-void wxGCDC::SetMapMode( int mode )
+wxSize wxGCDCImpl::GetPPI() const
 {
-    switch (mode)
-    {
-    case wxMM_TWIPS:
-        SetLogicalScale( twips2mm * m_mm_to_pix_x, twips2mm * m_mm_to_pix_y );
-        break;
-
-    case wxMM_POINTS:
-        SetLogicalScale( pt2mm * m_mm_to_pix_x, pt2mm * m_mm_to_pix_y );
-        break;
-
-    case wxMM_METRIC:
-        SetLogicalScale( m_mm_to_pix_x, m_mm_to_pix_y );
-        break;
-
-    case wxMM_LOMETRIC:
-        SetLogicalScale( m_mm_to_pix_x / 10.0, m_mm_to_pix_y / 10.0 );
-        break;
-
-    case wxMM_TEXT:
-    default:
-        SetLogicalScale( 1.0, 1.0 );
-        break;
-    }
-
-    ComputeScaleAndOrigin();
+    return wxSize(72, 72);
 }
 
-void wxGCDC::SetUserScale( double x, double y )
+int wxGCDCImpl::GetDepth() const
 {
-    // allow negative ? -> no
-
-    m_userScaleX = x;
-    m_userScaleY = y;
-    ComputeScaleAndOrigin();
+    return 32;
 }
 
-void wxGCDC::SetLogicalScale( double x, double y )
+void wxGCDCImpl::ComputeScaleAndOrigin()
 {
-    // allow negative ?
-    m_logicalScaleX = x;
-    m_logicalScaleY = y;
-    ComputeScaleAndOrigin();
-}
+    wxDCImpl::ComputeScaleAndOrigin();
 
-void wxGCDC::SetLogicalOrigin( wxCoord x, wxCoord y )
-{
-    m_logicalOriginX = x * m_signX;   // is this still correct ?
-    m_logicalOriginY = y * m_signY;
-    ComputeScaleAndOrigin();
-}
+    if ( m_graphicContext )
+    {
+        m_matrixCurrent = m_graphicContext->CreateMatrix();
 
-void wxGCDC::SetDeviceOrigin( wxCoord x, wxCoord y )
-{
-    m_deviceOriginX = x;
-    m_deviceOriginY = y;
-    ComputeScaleAndOrigin();
-}
+        // the logical origin sets the origin to have new coordinates
+        m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
+                                   m_deviceOriginY - m_logicalOriginY * m_signY * m_scaleY);
 
-void wxGCDC::SetAxisOrientation( bool xLeftRight, bool yBottomUp )
-{
-    m_signX = (xLeftRight ?  1 : -1);
-    m_signY = (yBottomUp ? -1 :  1);
-    ComputeScaleAndOrigin();
-}
+        m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 
-wxSize wxGCDC::GetPPI() const
-{
-    return wxSize(72, 72);
-}
-
-int wxGCDC::GetDepth() const
-{
-    return 32;
+        m_graphicContext->SetTransform( m_matrixOriginal );
+        m_graphicContext->ConcatTransform( m_matrixCurrent );
+    }
 }
 
-void wxGCDC::ComputeScaleAndOrigin()
+void* wxGCDCImpl::GetHandle() const
 {
-    m_scaleX = m_logicalScaleX * m_userScaleX;
-    m_scaleY = m_logicalScaleY * m_userScaleY;
-    m_deviceOriginX = /* m_deviceOriginX + */ m_logicalOriginX;
-    m_deviceOriginY = /* m_deviceOriginY + */ m_logicalOriginY;
-
-    m_matrixCurrent = m_graphicContext->CreateMatrix();
-    m_matrixCurrent.Translate( m_deviceOriginX , m_deviceOriginY );
-    m_matrixCurrent.Scale( m_scaleX, m_scaleY );
-    
-    m_graphicContext->SetTransform( m_matrixOriginal );
-    m_graphicContext->ConcatTransform( m_matrixCurrent );
+    void* cgctx = NULL;
+    wxGraphicsContext* gc = GetGraphicsContext();
+    if (gc) {
+        cgctx = gc->GetNativeContext();
+    }
+    return cgctx;
 }
 
-void wxGCDC::SetPalette( const wxPalette& WXUNUSED(palette) )
+void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 {
 
 }
 
-void wxGCDC::SetBackgroundMode( int mode )
+void wxGCDCImpl::SetBackgroundMode( int mode )
 {
     m_backgroundMode = mode;
 }
 
-void wxGCDC::SetFont( const wxFont &font )
+void wxGCDCImpl::SetFont( const wxFont &font )
 {
     m_font = font;
     if ( m_graphicContext )
     {
-        wxFont f = font;
-        if ( f.Ok() )
-            f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
-        m_graphicContext->SetFont( f, m_textForegroundColour );
+        m_graphicContext->SetFont(font, m_textForegroundColour);
     }
 }
 
-void wxGCDC::SetPen( const wxPen &pen )
+void wxGCDCImpl::SetPen( const wxPen &pen )
 {
-    if ( m_pen == pen )
-        return;
-
     m_pen = pen;
     if ( m_graphicContext )
     {
@@ -336,11 +443,8 @@ void wxGCDC::SetPen( const wxPen &pen )
     }
 }
 
-void wxGCDC::SetBrush( const wxBrush &brush )
+void wxGCDCImpl::SetBrush( const wxBrush &brush )
 {
-    if (m_brush == brush)
-        return;
-
     m_brush = brush;
     if ( m_graphicContext )
     {
@@ -348,56 +452,47 @@ void wxGCDC::SetBrush( const wxBrush &brush )
     }
 }
 
-void wxGCDC::SetBackground( const wxBrush &brush )
+void wxGCDCImpl::SetBackground( const wxBrush &brush )
 {
-    if (m_backgroundBrush == brush)
-        return;
-
     m_backgroundBrush = brush;
-    if (!m_backgroundBrush.Ok())
+    if (!m_backgroundBrush.IsOk())
         return;
 }
 
-void wxGCDC::SetLogicalFunction( int function )
+void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 {
-    if (m_logicalFunction == function)
-        return;
-
     m_logicalFunction = function;
-#if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
 
-    CGContextRef cgContext = ((wxCairoContext*)(m_graphicContext))->GetNativeContext();
-    if ( m_logicalFunction == wxCOPY )
-        CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
-    else if ( m_logicalFunction == wxINVERT )
-        CGContextSetBlendMode( cgContext, kCGBlendModeExclusion );
-    else
-        CGContextSetBlendMode( cgContext, kCGBlendModeNormal );
-#endif
+    wxCompositionMode mode = TranslateRasterOp( function );
+    m_logicalFunctionSupported = mode != wxCOMPOSITION_INVALID;
+    if (m_logicalFunctionSupported)
+        m_logicalFunctionSupported = m_graphicContext->SetCompositionMode(mode);
 
+    if ( function == wxXOR )
+        m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
+    else
+        m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 }
 
-bool wxGCDC::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
-                         const wxColour& WXUNUSED(col), int WXUNUSED(style))
+bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
+                             const wxColour& WXUNUSED(col),
+                             wxFloodFillStyle WXUNUSED(style))
 {
     return false;
 }
 
-bool wxGCDC::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
+bool wxGCDCImpl::DoGetPixel( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), wxColour *WXUNUSED(col) ) const
 {
     //  wxCHECK_MSG( 0 , false, wxT("wxGCDC(cg)::DoGetPixel - not implemented") );
     return false;
 }
 
-void wxGCDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
+void wxGCDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
-
-#if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLine - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
-#endif
 
     m_graphicContext->StrokeLine(x1,y1,x2,y2);
 
@@ -405,16 +500,16 @@ void wxGCDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
     CalcBoundingBox(x2, y2);
 }
 
-void wxGCDC::DoCrossHair( wxCoord x, wxCoord y )
+void wxGCDCImpl::DoCrossHair( wxCoord x, wxCoord y )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoCrossHair - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
     int w = 0, h = 0;
 
-    GetSize( &w, &h );
+    GetOwner()->GetSize( &w, &h );
 
     m_graphicContext->StrokeLine(0,y,w,y);
     m_graphicContext->StrokeLine(x,0,x,h);
@@ -423,13 +518,13 @@ void wxGCDC::DoCrossHair( wxCoord x, wxCoord y )
     CalcBoundingBox(0+w, 0+h);
 }
 
-void wxGCDC::DoDrawArc( wxCoord x1, wxCoord y1,
+void wxGCDCImpl::DoDrawArc( wxCoord x1, wxCoord y1,
                         wxCoord x2, wxCoord y2,
                         wxCoord xc, wxCoord yc )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawArc - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
     double dx = x1 - xc;
@@ -461,55 +556,65 @@ void wxGCDC::DoDrawArc( wxCoord x1, wxCoord y1,
     wxGraphicsPath path = m_graphicContext->CreatePath();
     if ( fill && ((x1!=x2)||(y1!=y2)) )
         path.MoveToPoint( xc, yc );
-    path.AddArc( xc, yc , rad , DegToRad(sa) , DegToRad(ea), false );
+    // since these angles (ea,sa) are measured counter-clockwise, we invert them to
+    // get clockwise angles
+    path.AddArc( xc, yc , rad , DegToRad(-sa) , DegToRad(-ea), false );
     if ( fill && ((x1!=x2)||(y1!=y2)) )
         path.AddLineToPoint( xc, yc );
     m_graphicContext->DrawPath(path);
 }
 
-void wxGCDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
+void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
                                 double sa, double ea )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipticArc - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
-    bool fill = m_brush.GetStyle() != wxTRANSPARENT;
-
-    wxGraphicsPath path = m_graphicContext->CreatePath();
     m_graphicContext->PushState();
-    m_graphicContext->Translate(x+w/2,y+h/2);
+    m_graphicContext->Translate(x+w/2.0,y+h/2.0);
     wxDouble factor = ((wxDouble) w) / h;
     m_graphicContext->Scale( factor , 1.0);
-    if ( fill && (sa!=ea) )
-        path.MoveToPoint(0,0);
+
     // since these angles (ea,sa) are measured counter-clockwise, we invert them to
     // get clockwise angles
-    path.AddArc( 0, 0, h/2 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
-    if ( fill && (sa!=ea) )
-        path.AddLineToPoint(0,0);
-    m_graphicContext->DrawPath( path );
+    if ( m_brush.GetStyle() != wxTRANSPARENT )
+    {
+        wxGraphicsPath path = m_graphicContext->CreatePath();
+        path.MoveToPoint( 0, 0 );
+        path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
+        path.AddLineToPoint( 0, 0 );
+        m_graphicContext->FillPath( path );
+
+        path = m_graphicContext->CreatePath();
+        path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
+        m_graphicContext->StrokePath( path );
+    }
+    else
+    {
+        wxGraphicsPath path = m_graphicContext->CreatePath();
+        path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
+        m_graphicContext->DrawPath( path );
+    }
+
     m_graphicContext->PopState();
 }
 
-void wxGCDC::DoDrawPoint( wxCoord x, wxCoord y )
+void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPoint - invalid DC") );
 
     DoDrawLine( x , y , x + 1 , y + 1 );
 }
 
-void wxGCDC::DoDrawLines(int n, wxPoint points[],
+void wxGCDCImpl::DoDrawLines(int n, const wxPoint points[],
                          wxCoord xoffset, wxCoord yoffset)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
-
-#if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
-#endif
 
     wxPoint2DDouble* pointsD = new wxPoint2DDouble[n];
     for( int i = 0; i < n; ++i)
@@ -523,27 +628,27 @@ void wxGCDC::DoDrawLines(int n, wxPoint points[],
 }
 
 #if wxUSE_SPLINES
-void wxGCDC::DoDrawSpline(wxList *points)
+void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawSpline - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
     wxGraphicsPath path = m_graphicContext->CreatePath();
 
-    wxList::compatibility_iterator node = points->GetFirst();
-    if (node == wxList::compatibility_iterator())
+    wxPointList::compatibility_iterator node = points->GetFirst();
+    if ( !node )
         // empty list
         return;
 
-    wxPoint *p = (wxPoint *)node->GetData();
+    const wxPoint *p = node->GetData();
 
     wxCoord x1 = p->x;
     wxCoord y1 = p->y;
 
     node = node->GetNext();
-    p = (wxPoint *)node->GetData();
+    p = node->GetData();
 
     wxCoord x2 = p->x;
     wxCoord y2 = p->y;
@@ -552,16 +657,16 @@ void wxGCDC::DoDrawSpline(wxList *points)
 
     path.MoveToPoint( x1 , y1 );
     path.AddLineToPoint( cx1 , cy1 );
-#if !wxUSE_STL
+#if !wxUSE_STD_CONTAINERS
 
     while ((node = node->GetNext()) != NULL)
 #else
 
     while ((node = node->GetNext()))
-#endif // !wxUSE_STL
+#endif // !wxUSE_STD_CONTAINERS
 
     {
-        p = (wxPoint *)node->GetData();
+        p = node->GetData();
         x1 = x2;
         y1 = y2;
         x2 = p->x;
@@ -581,15 +686,15 @@ void wxGCDC::DoDrawSpline(wxList *points)
 }
 #endif // wxUSE_SPLINES
 
-void wxGCDC::DoDrawPolygon( int n, wxPoint points[],
-                            wxCoord xoffset, wxCoord yoffset,
-                            int fillStyle )
+void wxGCDCImpl::DoDrawPolygon( int n, const wxPoint points[],
+                                wxCoord xoffset, wxCoord yoffset,
+                                wxPolygonFillMode fillStyle )
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 
     if ( n <= 0 || (m_brush.GetStyle() == wxTRANSPARENT && m_pen.GetStyle() == wxTRANSPARENT ) )
         return;
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
     bool closeIt = false;
@@ -609,12 +714,12 @@ void wxGCDC::DoDrawPolygon( int n, wxPoint points[],
     delete[] pointsD;
 }
 
-void wxGCDC::DoDrawPolyPolygon(int n,
-                               int count[],
-                               wxPoint points[],
+void wxGCDCImpl::DoDrawPolyPolygon(int n,
+                               const int count[],
+                               const wxPoint points[],
                                wxCoord xoffset,
                                wxCoord yoffset,
-                               int fillStyle)
+                               wxPolygonFillMode fillStyle)
 {
     wxASSERT(n > 1);
     wxGraphicsPath path = m_graphicContext->CreatePath();
@@ -638,11 +743,11 @@ void wxGCDC::DoDrawPolyPolygon(int n,
     m_graphicContext->DrawPath( path , fillStyle);
 }
 
-void wxGCDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
+void wxGCDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRectangle - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
     // CMB: draw nothing if transformed w or h is 0
@@ -659,13 +764,13 @@ void wxGCDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
     m_graphicContext->DrawRectangle(x,y,w,h);
 }
 
-void wxGCDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
+void wxGCDCImpl::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
                                     wxCoord w, wxCoord h,
                                     double radius)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRoundedRectangle - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
     if (radius < 0.0)
@@ -675,149 +780,191 @@ void wxGCDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y,
     if (w == 0 || h == 0)
         return;
 
+    if ( m_graphicContext->ShouldOffset() )
+    {
+        // if we are offsetting the entire rectangle is moved 0.5, so the
+        // border line gets off by 1
+        w -= 1;
+        h -= 1;
+    }
     m_graphicContext->DrawRoundedRectangle( x,y,w,h,radius);
 }
 
-void wxGCDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
+void wxGCDCImpl::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawEllipse - invalid DC") );
 
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
+    if ( m_graphicContext->ShouldOffset() )
+    {
+        // if we are offsetting the entire rectangle is moved 0.5, so the
+        // border line gets off by 1
+        w -= 1;
+        h -= 1;
+    }
     m_graphicContext->DrawEllipse(x,y,w,h);
 }
 
-bool wxGCDC::CanDrawBitmap() const
+bool wxGCDCImpl::CanDrawBitmap() const
 {
     return true;
 }
 
-bool wxGCDC::DoBlit(
+bool wxGCDCImpl::DoBlit(
     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
-    wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool WXUNUSED(useMask),
+    wxDC *source, wxCoord xsrc, wxCoord ysrc,
+    wxRasterOperationMode logical_func , bool useMask,
     wxCoord xsrcMask, wxCoord ysrcMask )
 {
-    wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid DC") );
-    wxCHECK_MSG( source->Ok(), false, wxT("wxGCDC(cg)::DoBlit - invalid source DC") );
-    
+    return DoStretchBlit( xdest, ydest, width, height,
+        source, xsrc, ysrc, width, height, logical_func, useMask,
+        xsrcMask,ysrcMask );
+}
+
+bool wxGCDCImpl::DoStretchBlit(
+    wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
+    wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
+    wxRasterOperationMode logical_func , bool useMask,
+    wxCoord xsrcMask, wxCoord ysrcMask )
+{
+    wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
+    wxCHECK_MSG( source->IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid source DC") );
+
     if ( logical_func == wxNO_OP )
         return true;
-    else if ( logical_func != wxCOPY )
+
+    wxCompositionMode mode = TranslateRasterOp(logical_func);
+    if ( mode == wxCOMPOSITION_INVALID )
     {
-        wxFAIL_MSG( wxT("Blitting is only supported with wxCOPY logical operation.") );
+        wxFAIL_MSG( wxT("Blitting is not supported with this logical operation.") );
         return false;
     }
 
-    if (xsrcMask == -1 && ysrcMask == -1)
-    {
-        xsrcMask = xsrc;
-        ysrcMask = ysrc;
-    }
+    wxRect subrect(source->LogicalToDeviceX(xsrc),
+                   source->LogicalToDeviceY(ysrc),
+                   source->LogicalToDeviceXRel(srcWidth),
+                   source->LogicalToDeviceYRel(srcHeight));
+    const wxRect subrectOrig = subrect;
+    // clip the subrect down to the size of the source DC
+    wxRect clip;
+    source->GetSize(&clip.width, &clip.height);
+    subrect.Intersect(clip);
+    if (subrect.width == 0)
+        return true;
 
-    wxCoord yysrc = source-> LogicalToDeviceY(ysrc);
-    wxCoord xxsrc = source-> LogicalToDeviceX(xsrc);
-    wxCoord wwsrc = source-> LogicalToDeviceXRel(width);
-    wxCoord hhsrc = source-> LogicalToDeviceYRel(height);
+    bool retval = true;
 
-    wxBitmap blit;
-    wxMemoryDC* memdc = wxDynamicCast(source,wxMemoryDC);
-    if ( memdc )
+    wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
+    if (m_graphicContext->SetCompositionMode(mode))
     {
-        blit = memdc->GetSelectedBitmap();
+        wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
+        if (mode == wxCOMPOSITION_XOR)
+        {
+            m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
+        }
 
-        wxASSERT_MSG( blit.Ok() , wxT("Invalid bitmap for blitting") );
+        if (xsrcMask == -1 && ysrcMask == -1)
+        {
+            xsrcMask = xsrc;
+            ysrcMask = ysrc;
+        }
 
-        wxCoord bmpwidth = blit.GetWidth();
-        wxCoord bmpheight = blit.GetHeight();
+        wxBitmap blit = source->GetAsBitmap( &subrect );
 
-        if ( xxsrc != 0 || yysrc != 0 || bmpwidth != wwsrc || bmpheight != hhsrc )
+        if ( blit.IsOk() )
         {
-            wwsrc = wxMin( wwsrc , bmpwidth - xxsrc );
-            hhsrc = wxMin( hhsrc , bmpheight - yysrc );
-            if ( wwsrc > 0 && hhsrc > 0 )
-            {
-                if ( xxsrc >= 0 && yysrc >= 0 )
-                {
-                    wxRect subrect( xxsrc, yysrc, wwsrc , hhsrc );
-                    // TODO we perhaps could add a DrawSubBitmap call to dc for performance reasons
-                    blit = blit.GetSubBitmap( subrect );
-                }
-                else
-                {
-                    // in this case we'd probably have to adjust the different coordinates, but
-                    // we have to find out proper contract first
-                    blit = wxNullBitmap;
-                }
-            }
-            else
+            if ( !useMask && blit.GetMask() )
+                blit.SetMask(NULL);
+
+            double x = xdest;
+            double y = ydest;
+            double w = dstWidth;
+            double h = dstHeight;
+            // adjust dest rect if source rect is clipped
+            if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
             {
-                blit = wxNullBitmap;
+                x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
+                y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
+                w *= double(subrect.width) / subrectOrig.width;
+                h *= double(subrect.height) / subrectOrig.height;
             }
+            m_graphicContext->DrawBitmap(blit, x, y, w, h);
         }
-    }
-    else
-    {  
-        wxWindowDC* windc = wxDynamicCast(source,wxWindowDC);
-        if (windc)
-        {   
-            wxBitmap bmp;
-            bmp = windc->GetAsBitmap();
-            if (bmp.IsOk())
-                blit = bmp.GetSubBitmap( wxRect(xsrc, ysrc, width, height ) ); 
+        else
+        {
+            wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
+            retval = false;
+        }
+
+        if (mode == wxCOMPOSITION_XOR)
+        {
+            m_graphicContext->SetAntialiasMode(formerAa);
         }
     }
-    
-    if ( blit.Ok() )
-    {
-        m_graphicContext->DrawBitmap( blit, xdest , ydest , width , height );
-    }
-    else
-    {
-        wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
-        return false;
-    }
+    // reset composition
+    m_graphicContext->SetCompositionMode(formerMode);
 
-    return true;
+    return retval;
 }
 
-void wxGCDC::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
+void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
                                double angle)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 
-    if ( str.length() == 0 )
+    if ( str.empty() )
         return;
-    if ( m_logicalFunction != wxCOPY )
+    if ( !m_logicalFunctionSupported )
         return;
 
-     m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
+    if ( m_backgroundMode == wxTRANSPARENT )
+        m_graphicContext->DrawText( str, x ,y , DegToRad(angle ));
+    else
+        m_graphicContext->DrawText( str, x ,y , DegToRad(angle ), m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 }
 
-void wxGCDC::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
+void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
+    // For compatibility with other ports (notably wxGTK) and because it's
+    // genuinely useful, we allow passing multiline strings to DrawText().
+    // However there is no native OSX function to draw them directly so we
+    // instead reuse the generic DrawLabel() method to render them. Of course,
+    // DrawLabel() itself will call back to us but with single line strings
+    // only so there won't be any infinite recursion here.
+    if ( str.find('\n') != wxString::npos )
+    {
+        GetOwner()->DrawLabel(str, wxRect(x, y, 0, 0));
+        return;
+    }
+
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
 
-    if ( str.length() == 0 )
+    if ( str.empty() )
         return;
-    if ( m_logicalFunction != wxCOPY )
+
+    if ( !m_logicalFunctionSupported )
         return;
 
-    m_graphicContext->DrawText( str, x ,y);
+    if ( m_backgroundMode == wxTRANSPARENT )
+        m_graphicContext->DrawText( str, x ,y);
+    else
+        m_graphicContext->DrawText( str, x ,y , m_graphicContext->CreateBrush( wxBrush(m_textBackgroundColour,wxSOLID) ) );
 }
 
-bool wxGCDC::CanGetTextExtent() const
+bool wxGCDCImpl::CanGetTextExtent() const
 {
-    wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
+    wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::CanGetTextExtent - invalid DC") );
 
     return true;
 }
 
-void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
+void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
                               wxCoord *descent, wxCoord *externalLeading ,
-                              wxFont *theFont ) const
+                              const wxFont *theFont ) const
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
+    wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 
     if ( theFont )
     {
@@ -829,13 +976,13 @@ void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *heig
     m_graphicContext->GetTextExtent( str, &w, &h, &d, &e );
 
     if ( height )
-        *height = h;
+        *height = (wxCoord)(h+0.5);
     if ( descent )
-        *descent = d;
+        *descent = (wxCoord)(d+0.5);
     if ( externalLeading )
-        *externalLeading =e;
+        *externalLeading = (wxCoord)(e+0.5);
     if ( width )
-        *width = w;
+        *width = (wxCoord)(w+0.5);
 
     if ( theFont )
     {
@@ -843,9 +990,9 @@ void wxGCDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *heig
     }
 }
 
-bool wxGCDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
+bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 {
-    wxCHECK_MSG( Ok(), false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
+    wxCHECK_MSG( m_graphicContext, false, wxT("wxGCDC(cg)::DoGetPartialTextExtents - invalid DC") );
     widths.Clear();
     widths.Add(0,text.Length());
     if ( text.IsEmpty() )
@@ -860,7 +1007,7 @@ bool wxGCDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) c
     return true;
 }
 
-wxCoord wxGCDC::GetCharWidth(void) const
+wxCoord wxGCDCImpl::GetCharWidth(void) const
 {
     wxCoord width;
     DoGetTextExtent( wxT("g") , &width , NULL , NULL , NULL , NULL );
@@ -868,7 +1015,7 @@ wxCoord wxGCDC::GetCharWidth(void) const
     return width;
 }
 
-wxCoord wxGCDC::GetCharHeight(void) const
+wxCoord wxGCDCImpl::GetCharHeight(void) const
 {
     wxCoord height;
     DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL );
@@ -876,25 +1023,36 @@ wxCoord wxGCDC::GetCharHeight(void) const
     return height;
 }
 
-void wxGCDC::Clear(void)
+void wxGCDCImpl::Clear(void)
 {
-    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::Clear - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::Clear - invalid DC") );
     // TODO better implementation / incorporate size info into wxGCDC or context
     m_graphicContext->SetBrush( m_backgroundBrush );
     wxPen p = *wxTRANSPARENT_PEN;
     m_graphicContext->SetPen( p );
-    DoDrawRectangle( 0, 0, 32000 , 32000 );
-    m_graphicContext->SetPen( m_pen );    
+    wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
+    m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
+    // maximum positive coordinate Cairo can handle is 2^23 - 1
+    DoDrawRectangle(
+        DeviceToLogicalX(0), DeviceToLogicalY(0),
+        DeviceToLogicalXRel(0x007fffff), DeviceToLogicalYRel(0x007fffff));
+    m_graphicContext->SetCompositionMode(formerMode);
+    m_graphicContext->SetPen( m_pen );
     m_graphicContext->SetBrush( m_brush );
 }
 
-void wxGCDC::DoGetSize(int *width, int *height) const
+void wxGCDCImpl::DoGetSize(int *width, int *height) const
 {
-    *width = 1000;
-    *height = 1000;
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetSize - invalid DC") );
+    wxDouble w,h;
+    m_graphicContext->GetSize( &w, &h );
+    if ( height )
+        *height = (int) (h+0.5);
+    if ( width )
+        *width = (int) (w+0.5);
 }
 
-void wxGCDC::DoGradientFillLinear(const wxRect& rect,
+void wxGCDCImpl::DoGradientFillLinear(const wxRect& rect,
                                   const wxColour& initialColour,
                                   const wxColour& destColour,
                                   wxDirection nDirection )
@@ -935,9 +1093,10 @@ void wxGCDC::DoGradientFillLinear(const wxRect& rect,
     m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
     m_graphicContext->SetPen(m_pen);
+    m_graphicContext->SetBrush(m_brush);
 }
 
-void wxGCDC::DoGradientFillConcentric(const wxRect& rect,
+void wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
                                       const wxColour& initialColour,
                                       const wxColour& destColour,
                                       const wxPoint& circleCenter)
@@ -963,12 +1122,30 @@ void wxGCDC::DoGradientFillConcentric(const wxRect& rect,
 
     m_graphicContext->DrawRectangle(rect.x,rect.y,rect.width,rect.height);
     m_graphicContext->SetPen(m_pen);
+    m_graphicContext->SetBrush(m_brush);
 }
 
-void wxGCDC::DoDrawCheckMark(wxCoord x, wxCoord y,
+void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
                              wxCoord width, wxCoord height)
 {
-    wxDCBase::DoDrawCheckMark(x,y,width,height);
+    wxDCImpl::DoDrawCheckMark(x,y,width,height);
+}
+
+#ifdef __WXMSW__
+wxRect wxGCDCImpl::MSWApplyGDIPlusTransform(const wxRect& r) const
+{
+    wxGraphicsContext* const gc = GetGraphicsContext();
+    wxCHECK_MSG( gc, r, wxT("Invalid wxGCDC") );
+
+    double x = 0,
+           y = 0;
+    gc->GetTransform().TransformPoint(&x, &y);
+
+    wxRect rect(r);
+    rect.Offset(x, y);
+
+    return rect;
 }
+#endif // __WXMSW__
 
 #endif // wxUSE_GRAPHICS_CONTEXT