X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/71be467a6cbb0788398a867cee7c133060366170..bf2c43c76e2819be443ab1d830ab68d9569d66b1:/src/common/dcgraph.cpp

diff --git a/src/common/dcgraph.cpp b/src/common/dcgraph.cpp
index 6c4e534530..a44ac2cb91 100644
--- a/src/common/dcgraph.cpp
+++ b/src/common/dcgraph.cpp
@@ -1,10 +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:
-// RCS-ID:      $Id$
 // Copyright:   (c) Stefan Csomor
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
@@ -18,20 +17,12 @@
 
 #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
-
-#include "wx/dcclient.h"
-
-#ifdef __WXOSX__
-    #include "ApplicationServices/ApplicationServices.h"
 #endif
 
 //-----------------------------------------------------------------------------
@@ -49,6 +40,44 @@ 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
 //-----------------------------------------------------------------------------
@@ -65,6 +94,26 @@ wxGCDC::wxGCDC( const wxMemoryDC& dc) :
 {
 }
 
+#if wxUSE_PRINTING_ARCHITECTURE
+wxGCDC::wxGCDC( const wxPrinterDC& dc) :
+  wxDC( new wxGCDCImpl( this, dc ) )
+{
+}
+#endif
+
+#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 ) )
 {
@@ -74,7 +123,7 @@ wxGCDC::~wxGCDC()
 {
 }
 
-wxGraphicsContext* wxGCDC::GetGraphicsContext()
+wxGraphicsContext* wxGCDC::GetGraphicsContext() const
 {
     if (!m_pimpl) return NULL;
     wxGCDCImpl *gc_impl = (wxGCDCImpl*) m_pimpl;
@@ -93,7 +142,7 @@ IMPLEMENT_ABSTRACT_CLASS(wxGCDCImpl, wxDCImpl)
 wxGCDCImpl::wxGCDCImpl( wxDC *owner ) :
    wxDCImpl( owner )
 {
-    Init();
+    Init(wxGraphicsContext::Create());
 }
 
 void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
@@ -115,19 +164,40 @@ void wxGCDCImpl::SetGraphicsContext( wxGraphicsContext* ctx )
 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxWindowDC& dc ) :
    wxDCImpl( owner )
 {
-    Init();
-    SetGraphicsContext( wxGraphicsContext::Create(dc) );
+    Init(wxGraphicsContext::Create(dc));
     m_window = dc.GetWindow();
 }
 
 wxGCDCImpl::wxGCDCImpl( wxDC *owner, const wxMemoryDC& dc ) :
    wxDCImpl( owner )
 {
-    Init();
-    SetGraphicsContext( wxGraphicsContext::Create(dc) );
+    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
 
-void wxGCDCImpl::Init()
+wxGCDCImpl::wxGCDCImpl(wxDC* owner, int)
+   : wxDCImpl(owner)
+{
+    // derived class will set a context
+    Init(NULL);
+}
+
+void wxGCDCImpl::Init(wxGraphicsContext* ctx)
 {
     m_ok = false;
     m_colour = true;
@@ -139,32 +209,45 @@ void wxGCDCImpl::Init()
     m_brush = *wxWHITE_BRUSH;
 
     m_graphicContext = NULL;
+    if (ctx)
+        SetGraphicsContext(ctx);
+
     m_logicalFunctionSupported = true;
 }
 
-
 wxGCDCImpl::~wxGCDCImpl()
 {
     delete m_graphicContext;
 }
 
-void wxGCDCImpl::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( 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 , bmp.GetWidth() , bmp.GetHeight() );
+        m_graphicContext->DrawRectangle( x, y, w, h );
         m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
-        m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
+        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
-        m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
+    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( bmpCopy, x, y, w, h );
+    }
 }
 
 void wxGCDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
@@ -197,9 +280,7 @@ void wxGCDCImpl::EndPage()
 
 void wxGCDCImpl::Flush()
 {
-#ifdef __WXOSX__
-    CGContextFlush( (CGContextRef) m_graphicContext->GetNativeContext() );
-#endif
+    m_graphicContext->Flush();
 }
 
 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )
@@ -207,28 +288,14 @@ 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 wxGCDCImpl::DoSetClippingRegionAsRegion( const wxRegion &region )
+void wxGCDCImpl::DoSetDeviceClippingRegion( const wxRegion &region )
 {
     // region is in device coordinates
-    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegionAsRegion - invalid DC") );
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetDeviceClippingRegion - invalid DC") );
 
     if (region.Empty())
     {
@@ -265,7 +332,7 @@ void wxGCDCImpl::DestroyClippingRegion()
 {
     m_graphicContext->ResetClip();
     // currently the clip eg of a window extends to the area between the scrollbars
-    // so we must explicitely make sure it only covers the area we want it to draw
+    // 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) );
@@ -291,7 +358,10 @@ void wxGCDCImpl::SetTextForeground( const wxColour &col )
 {
     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 );
@@ -305,35 +375,6 @@ void wxGCDCImpl::SetTextBackground( const wxColour &col )
     m_textBackgroundColour = col;
 }
 
-void wxGCDCImpl::SetMapMode( int mode )
-{
-    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();
-}
-
 wxSize wxGCDCImpl::GetPPI() const
 {
     return wxSize(72, 72);
@@ -351,16 +392,28 @@ void wxGCDCImpl::ComputeScaleAndOrigin()
     if ( m_graphicContext )
     {
         m_matrixCurrent = m_graphicContext->CreateMatrix();
-        m_matrixCurrent.Translate( m_deviceOriginX, m_deviceOriginY );
-        m_matrixCurrent.Scale( m_scaleX, m_scaleY );
+
         // the logical origin sets the origin to have new coordinates
-        m_matrixCurrent.Translate( -m_logicalOriginX, -m_logicalOriginY );
+        m_matrixCurrent.Translate( m_deviceOriginX - m_logicalOriginX * m_signX * m_scaleX,
+                                   m_deviceOriginY - m_logicalOriginY * m_signY * m_scaleY);
+
+        m_matrixCurrent.Scale( m_scaleX * m_signX, m_scaleY * m_signY );
 
         m_graphicContext->SetTransform( m_matrixOriginal );
         m_graphicContext->ConcatTransform( m_matrixCurrent );
     }
 }
 
+void* wxGCDCImpl::GetHandle() const
+{
+    void* cgctx = NULL;
+    wxGraphicsContext* gc = GetGraphicsContext();
+    if (gc) {
+        cgctx = gc->GetNativeContext();
+    }
+    return cgctx;
+}
+
 void wxGCDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
 {
 
@@ -376,18 +429,12 @@ void wxGCDCImpl::SetFont( const wxFont &font )
     m_font = font;
     if ( m_graphicContext )
     {
-        wxFont f = font;
-        if ( f.IsOk() )
-            f.SetPointSize( /*LogicalToDeviceYRel*/(font.GetPointSize()));
-        m_graphicContext->SetFont( f, m_textForegroundColour );
+        m_graphicContext->SetFont(font, m_textForegroundColour);
     }
 }
 
 void wxGCDCImpl::SetPen( const wxPen &pen )
 {
-    if ( m_pen == pen )
-        return;
-
     m_pen = pen;
     if ( m_graphicContext )
     {
@@ -397,9 +444,6 @@ void wxGCDCImpl::SetPen( const wxPen &pen )
 
 void wxGCDCImpl::SetBrush( const wxBrush &brush )
 {
-    if (m_brush == brush)
-        return;
-
     m_brush = brush;
     if ( m_graphicContext )
     {
@@ -409,28 +453,29 @@ void wxGCDCImpl::SetBrush( const wxBrush &brush )
 
 void wxGCDCImpl::SetBackground( const wxBrush &brush )
 {
-    if (m_backgroundBrush == brush)
-        return;
-
     m_backgroundBrush = brush;
     if (!m_backgroundBrush.IsOk())
         return;
 }
 
-void wxGCDCImpl::SetLogicalFunction( int function )
+void wxGCDCImpl::SetLogicalFunction( wxRasterOperationMode function )
 {
-    if (m_logicalFunction == function)
-        return;
-
     m_logicalFunction = function;
-    if ( m_graphicContext->SetLogicalFunction( function ) )
-        m_logicalFunctionSupported=true;
+
+    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_logicalFunctionSupported=false;
+        m_graphicContext->SetAntialiasMode(wxANTIALIAS_DEFAULT);
 }
 
 bool wxGCDCImpl::DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
-                         const wxColour& WXUNUSED(col), int WXUNUSED(style))
+                             const wxColour& WXUNUSED(col),
+                             wxFloodFillStyle WXUNUSED(style))
 {
     return false;
 }
@@ -537,21 +582,19 @@ void wxGCDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord w, wxCoord h,
     {
         wxGraphicsPath path = m_graphicContext->CreatePath();
         path.MoveToPoint( 0, 0 );
-        path.AddLineToPoint( h / 2.0 * cos(DegToRad(sa)) , h / 2.0 * sin(DegToRad(-sa)) );
-        path.AddLineToPoint( h / 2.0 * cos(DegToRad(ea)) , h / 2.0 * sin(DegToRad(-ea)) );
+        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->FillPath( path );
         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 );
+        path.AddArc( 0, 0, h/2.0 , DegToRad(-sa) , DegToRad(-ea), sa > ea );
+        m_graphicContext->DrawPath( path );
     }
 
     m_graphicContext->PopState();
@@ -564,7 +607,7 @@ void wxGCDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
     DoDrawLine( x , y , x + 1 , y + 1 );
 }
 
-void wxGCDCImpl::DoDrawLines(int n, wxPoint points[],
+void wxGCDCImpl::DoDrawLines(int n, const wxPoint points[],
                          wxCoord xoffset, wxCoord yoffset)
 {
     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawLines - invalid DC") );
@@ -594,11 +637,11 @@ void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
     wxGraphicsPath path = m_graphicContext->CreatePath();
 
     wxPointList::compatibility_iterator node = points->GetFirst();
-    if (node == wxPointList::compatibility_iterator())
+    if ( !node )
         // empty list
         return;
 
-    wxPoint *p = node->GetData();
+    const wxPoint *p = node->GetData();
 
     wxCoord x1 = p->x;
     wxCoord y1 = p->y;
@@ -613,13 +656,13 @@ void wxGCDCImpl::DoDrawSpline(const wxPointList *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 = node->GetData();
@@ -642,9 +685,9 @@ void wxGCDCImpl::DoDrawSpline(const wxPointList *points)
 }
 #endif // wxUSE_SPLINES
 
-void wxGCDCImpl::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( IsOk(), wxT("wxGCDC(cg)::DoDrawPolygon - invalid DC") );
 
@@ -671,11 +714,11 @@ void wxGCDCImpl::DoDrawPolygon( int n, wxPoint points[],
 }
 
 void wxGCDCImpl::DoDrawPolyPolygon(int n,
-                               int count[],
-                               wxPoint points[],
+                               const int count[],
+                               const wxPoint points[],
                                wxCoord xoffset,
                                wxCoord yoffset,
-                               int fillStyle)
+                               wxPolygonFillMode fillStyle)
 {
     wxASSERT(n > 1);
     wxGraphicsPath path = m_graphicContext->CreatePath();
@@ -770,7 +813,8 @@ bool wxGCDCImpl::CanDrawBitmap() const
 
 bool wxGCDCImpl::DoBlit(
     wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
-    wxDC *source, wxCoord xsrc, wxCoord ysrc, int logical_func , bool useMask,
+    wxDC *source, wxCoord xsrc, wxCoord ysrc,
+    wxRasterOperationMode logical_func , bool useMask,
     wxCoord xsrcMask, wxCoord ysrcMask )
 {
     return DoStretchBlit( xdest, ydest, width, height,
@@ -781,7 +825,7 @@ bool wxGCDCImpl::DoBlit(
 bool wxGCDCImpl::DoStretchBlit(
     wxCoord xdest, wxCoord ydest, wxCoord dstWidth, wxCoord dstHeight,
     wxDC *source, wxCoord xsrc, wxCoord ysrc, wxCoord srcWidth, wxCoord srcHeight,
-    int logical_func , bool WXUNUSED(useMask),
+    wxRasterOperationMode logical_func , bool useMask,
     wxCoord xsrcMask, wxCoord ysrcMask )
 {
     wxCHECK_MSG( IsOk(), false, wxT("wxGCDC(cg)::DoStretchBlit - invalid DC") );
@@ -789,51 +833,79 @@ bool wxGCDCImpl::DoStretchBlit(
 
     if ( logical_func == wxNO_OP )
         return true;
-    else if ( !m_graphicContext->SetLogicalFunction( logical_func ) )
 
+    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;
 
-    // if needed clip the subrect down to the size of the source DC
-    wxCoord sw, sh;
-    source->GetSize(&sw, &sh);
-    sw = source->LogicalToDeviceXRel(sw);
-    sh = source->LogicalToDeviceYRel(sh);
-    if (subrect.x + subrect.width > sw)
-        subrect.width = sw - subrect.x;
-    if (subrect.y + subrect.height > sh)
-        subrect.height = sh - subrect.y;
-
-    wxBitmap blit = source->GetAsBitmap( &subrect );
+    bool retval = true;
 
-    if ( blit.IsOk() )
+    wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
+    if (m_graphicContext->SetCompositionMode(mode))
     {
-        m_graphicContext->DrawBitmap( blit, xdest, ydest,
-                                      dstWidth, dstHeight);
-    }
-    else
-    {
-        wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
-        return false;
-    }
+        wxAntialiasMode formerAa = m_graphicContext->GetAntialiasMode();
+        if (mode == wxCOMPOSITION_XOR)
+        {
+            m_graphicContext->SetAntialiasMode(wxANTIALIAS_NONE);
+        }
+
+        if (xsrcMask == -1 && ysrcMask == -1)
+        {
+            xsrcMask = xsrc;
+            ysrcMask = ysrc;
+        }
 
-    // reset logical function
-    m_graphicContext->SetLogicalFunction( m_logicalFunction );
+        wxBitmap blit = source->GetAsBitmap( &subrect );
 
-    return true;
+        if ( blit.IsOk() )
+        {
+            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)
+            {
+                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
+        {
+            wxFAIL_MSG( wxT("Cannot Blit. Unable to get contents of DC as bitmap.") );
+            retval = false;
+        }
+
+        if (mode == wxCOMPOSITION_XOR)
+        {
+            m_graphicContext->SetAntialiasMode(formerAa);
+        }
+    }
+    // reset composition
+    m_graphicContext->SetCompositionMode(formerMode);
+
+    return retval;
 }
 
 void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
@@ -841,7 +913,7 @@ void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 {
     wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawRotatedText - invalid DC") );
 
-    if ( str.length() == 0 )
+    if ( str.empty() )
         return;
     if ( !m_logicalFunctionSupported )
         return;
@@ -854,9 +926,21 @@ void wxGCDCImpl::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
 
 void wxGCDCImpl::DoDrawText(const wxString& str, wxCoord x, wxCoord y)
 {
-    wxCHECK_RET( IsOk(), 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;
+    }
 
-    if ( str.length() == 0 )
+    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawText - invalid DC") );
+
+    if ( str.empty() )
         return;
 
     if ( !m_logicalFunctionSupported )
@@ -879,7 +963,7 @@ void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *
                               wxCoord *descent, wxCoord *externalLeading ,
                               const wxFont *theFont ) const
 {
-    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
+    wxCHECK_RET( m_graphicContext, wxT("wxGCDC(cg)::DoGetTextExtent - invalid DC") );
 
     if ( theFont )
     {
@@ -907,7 +991,7 @@ void wxGCDCImpl::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *
 
 bool wxGCDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 {
-    wxCHECK_MSG( IsOk(), 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() )
@@ -945,7 +1029,13 @@ void wxGCDCImpl::Clear(void)
     m_graphicContext->SetBrush( m_backgroundBrush );
     wxPen p = *wxTRANSPARENT_PEN;
     m_graphicContext->SetPen( p );
-    DoDrawRectangle( 0, 0, 32000 , 32000 );
+    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 );
 }
@@ -1002,6 +1092,7 @@ void wxGCDCImpl::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 wxGCDCImpl::DoGradientFillConcentric(const wxRect& rect,
@@ -1030,6 +1121,7 @@ void wxGCDCImpl::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 wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
@@ -1038,4 +1130,21 @@ void wxGCDCImpl::DoDrawCheckMark(wxCoord x, wxCoord y,
     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