Implement support for gradient stops for OS X.

[wxWidgets.git] / src / msw / graphics.cpp

diff --git a/src/msw/graphics.cpp b/src/msw/graphics.cpp
index e794e833482acae73bea07bfe8bacc174e5fdf58..8eb63748514c144e387f2dd96d7373062b931016 100644 (file)
--- a/src/msw/graphics.cpp
+++ b/src/msw/graphics.cpp
@@ -11,12 +11,12 @@
 
 #include "wx/wxprec.h"
 
 
 #include "wx/wxprec.h"
 

-#include "wx/dc.h"
-

 #ifdef __BORLANDC__
 #ifdef __BORLANDC__

-#pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #endif
 

+#include "wx/dc.h"
+

 #if wxUSE_GRAPHICS_CONTEXT
 
 #ifndef WX_PRECOMP
 #if wxUSE_GRAPHICS_CONTEXT
 
 #ifndef WX_PRECOMP


@@ -40,11 +40,21 @@
 #include "wx/private/graphics.h"
 #include "wx/msw/wrapgdip.h"
 #include "wx/msw/dc.h"
 #include "wx/private/graphics.h"
 #include "wx/msw/wrapgdip.h"
 #include "wx/msw/dc.h"

+#include "wx/dcgraph.h"
+
+#include "wx/msw/private.h" // needs to be before #include <commdlg.h>
+
+#if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__)
+#include <commdlg.h>
+#endif

 
 #include "wx/stack.h"
 
 WX_DECLARE_STACK(GraphicsState, GraphicsStates);
 
 
 #include "wx/stack.h"
 
 WX_DECLARE_STACK(GraphicsState, GraphicsStates);
 

+namespace
+{
+

 //-----------------------------------------------------------------------------
 // constants
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // constants
 //-----------------------------------------------------------------------------


@@ -55,11 +65,19 @@ const double RAD2DEG = 180.0 / M_PI;
 // Local functions
 //-----------------------------------------------------------------------------
 
 // Local functions
 //-----------------------------------------------------------------------------
 

-static inline double dmin(double a, double b) { return a < b ? a : b; }
-static inline double dmax(double a, double b) { return a > b ? a : b; }
+inline double dmin(double a, double b) { return a < b ? a : b; }
+inline double dmax(double a, double b) { return a > b ? a : b; }
+
+inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
+inline double RadToDeg(double deg) { return (deg * 180.0) / M_PI; }
+
+// translate a wxColour to a Color
+inline Color wxColourToColor(const wxColour& col)
+{
+    return Color(col.Alpha(), col.Red(), col.Green(), col.Blue());
+}

 
 

-static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
-static inline double RadToDeg(double deg) { return (deg * 180.0) / M_PI; }
+} // anonymous namespace

 
 //-----------------------------------------------------------------------------
 // device context implementation
 
 //-----------------------------------------------------------------------------
 // device context implementation


@@ -77,12 +95,6 @@ static inline double RadToDeg(double deg) { return (deg * 180.0) / M_PI; }
 // wxGraphicsPath implementation
 //-----------------------------------------------------------------------------
 
 // wxGraphicsPath implementation
 //-----------------------------------------------------------------------------
 

-#include "wx/msw/private.h" // needs to be before #include <commdlg.h>
-
-#if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__)
-#include <commdlg.h>
-#endif
-

 class wxGDIPlusPathData : public wxGraphicsPathData
 {
 public :
 class wxGDIPlusPathData : public wxGraphicsPathData
 {
 public :


@@ -145,7 +157,7 @@ public :
     // gets the bounding box enclosing all points (possibly including control points)
     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const;
 
     // gets the bounding box enclosing all points (possibly including control points)
     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const;
 

-    virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxODDEVEN_RULE) const;
+    virtual bool Contains( wxDouble x, wxDouble y, wxPolygonFillMode fillStyle = wxODDEVEN_RULE) const;

 
 private :
     GraphicsPath* m_path;
 
 private :
     GraphicsPath* m_path;


@@ -234,16 +246,24 @@ public:
     wxGDIPlusBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush );
     ~wxGDIPlusBrushData ();
 
     wxGDIPlusBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush );
     ~wxGDIPlusBrushData ();
 

-    void CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
-        const wxColour&c1, const wxColour&c2 );
-    void CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
-        const wxColour &oColor, const wxColour &cColor );
+    void CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
+                                   wxDouble x2, wxDouble y2,
+                                   const wxGraphicsGradientStops& stops);
+    void CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
+                                   wxDouble xc, wxDouble yc,
+                                   wxDouble radius,
+                                   const wxGraphicsGradientStops& stops);
+

     virtual Brush* GetGDIPlusBrush() { return m_brush; }
 
 protected:
     virtual void Init();
 
     virtual Brush* GetGDIPlusBrush() { return m_brush; }
 
 protected:
     virtual void Init();
 

-private :
+private:
+    // common part of Create{Linear,Radial}GradientBrush()
+    template <typename T>
+    void SetGradientStops(T *brush, const wxGraphicsGradientStops& stops);
+

     Brush* m_brush;
     Image* m_brushImage;
     GraphicsPath* m_brushPath;
     Brush* m_brush;
     Image* m_brushImage;
     GraphicsPath* m_brushPath;


@@ -296,13 +316,21 @@ public:
     virtual void * GetNativeContext();
 
     virtual void StrokePath( const wxGraphicsPath& p );
     virtual void * GetNativeContext();
 
     virtual void StrokePath( const wxGraphicsPath& p );

-    virtual void FillPath( const wxGraphicsPath& p , int fillStyle = wxODDEVEN_RULE );
+    virtual void FillPath( const wxGraphicsPath& p , wxPolygonFillMode fillStyle = wxODDEVEN_RULE );

 
 

-       // stroke lines connecting each of the points
+    // stroke lines connecting each of the points

     virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);
 
     // draws a polygon
     virtual void StrokeLines( size_t n, const wxPoint2DDouble *points);
 
     // draws a polygon

-    virtual void DrawLines( size_t n, const wxPoint2DDouble *points, int fillStyle = wxODDEVEN_RULE );
+    virtual void DrawLines( size_t n, const wxPoint2DDouble *points, wxPolygonFillMode fillStyle = wxODDEVEN_RULE );
+
+    virtual bool SetAntialiasMode(wxAntialiasMode antialias);
+
+    virtual bool SetCompositionMode(wxCompositionMode op);
+
+    virtual void BeginLayer(wxDouble opacity);
+
+    virtual void EndLayer();

 
     virtual void Translate( wxDouble dx , wxDouble dy );
     virtual void Scale( wxDouble xScale , wxDouble yScale );
 
     virtual void Translate( wxDouble dx , wxDouble dy );
     virtual void Scale( wxDouble xScale , wxDouble yScale );


@@ -323,7 +351,6 @@ public:
     virtual void PushState();
     virtual void PopState();
 
     virtual void PushState();
     virtual void PopState();
 

-    virtual void DrawText( const wxString &str, wxDouble x, wxDouble y);

     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
         wxDouble *descent, wxDouble *externalLeading ) const;
     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;
     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
         wxDouble *descent, wxDouble *externalLeading ) const;
     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;


@@ -334,6 +361,11 @@ private:
     void    Init();
     void    SetDefaults();
 
     void    Init();
     void    SetDefaults();
 

+    virtual void DoDrawText(const wxString& str, wxDouble x, wxDouble y)
+        { DoDrawFilledText(str, x, y, wxNullGraphicsBrush); }
+    virtual void DoDrawFilledText(const wxString& str, wxDouble x, wxDouble y,
+                                  const wxGraphicsBrush& backgroundBrush);
+

     Graphics* m_context;
     GraphicsStates m_stateStack;
     GraphicsState m_state1;
     Graphics* m_context;
     GraphicsStates m_stateStack;
     GraphicsState m_state1;


@@ -345,7 +377,7 @@ private:
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxGDIPlusContext)
 };
 
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxGDIPlusContext)
 };
 

-class WXDLLIMPEXP_CORE wxGDIPlusMeasuringContext : public wxGDIPlusContext
+class wxGDIPlusMeasuringContext : public wxGDIPlusContext

 {
 public:
     wxGDIPlusMeasuringContext( wxGraphicsRenderer* renderer ) : wxGDIPlusContext( renderer , m_hdc = GetDC(NULL), 1000, 1000 )
 {
 public:
     wxGDIPlusMeasuringContext( wxGraphicsRenderer* renderer ) : wxGDIPlusContext( renderer , m_hdc = GetDC(NULL), 1000, 1000 )


@@ -391,8 +423,7 @@ wxGDIPlusPenData::wxGDIPlusPenData( wxGraphicsRenderer* renderer, const wxPen &p
     if (m_width <= 0.0)
         m_width = 0.1;
 
     if (m_width <= 0.0)
         m_width = 0.1;
 

-    m_pen = new Pen(Color( pen.GetColour().Alpha() , pen.GetColour().Red() ,
-        pen.GetColour().Green() , pen.GetColour().Blue() ), m_width );
+    m_pen = new Pen(wxColourToColor(pen.GetColour()), m_width );

 
     LineCap cap;
     switch ( pen.GetCap() )
 
     LineCap cap;
     switch ( pen.GetCap() )


@@ -515,8 +546,12 @@ wxGDIPlusPenData::wxGDIPlusPenData( wxGraphicsRenderer* renderer, const wxPen &p
                 break ;
 
             }
                 break ;
 
             }

-            m_penBrush = new HatchBrush(style,Color( pen.GetColour().Alpha() , pen.GetColour().Red() ,
-                pen.GetColour().Green() , pen.GetColour().Blue() ), Color::Transparent );
+            m_penBrush = new HatchBrush
+                             (
+                                style,
+                                wxColourToColor(pen.GetColour()),
+                                Color::Transparent
+                             );

             m_pen->SetBrush( m_penBrush );
         }
         break;
             m_pen->SetBrush( m_penBrush );
         }
         break;


@@ -541,8 +576,7 @@ wxGDIPlusBrushData::wxGDIPlusBrushData( wxGraphicsRenderer* renderer , const wxB
     Init();
     if ( brush.GetStyle() == wxSOLID)
     {
     Init();
     if ( brush.GetStyle() == wxSOLID)
     {

-        m_brush = new SolidBrush( Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
-            brush.GetColour().Green() , brush.GetColour().Blue() ) );
+        m_brush = new SolidBrush(wxColourToColor( brush.GetColour()));

     }
     else if ( brush.IsHatch() )
     {
     }
     else if ( brush.IsHatch() )
     {


@@ -569,8 +603,12 @@ wxGDIPlusBrushData::wxGDIPlusBrushData( wxGraphicsRenderer* renderer , const wxB
             break ;
 
         }
             break ;
 
         }

-        m_brush = new HatchBrush(style,Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
-            brush.GetColour().Green() , brush.GetColour().Blue() ), Color::Transparent );
+        m_brush = new HatchBrush
+                      (
+                        style,
+                        wxColourToColor(brush.GetColour()),
+                        Color::Transparent
+                      );

     }
     else
     {
     }
     else
     {


@@ -598,28 +636,67 @@ void wxGDIPlusBrushData::Init()
     m_brushPath= NULL;
 }
 
     m_brushPath= NULL;
 }
 

-void wxGDIPlusBrushData::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2, const wxColour&c1, const wxColour&c2)
+template <typename T>
+void
+wxGDIPlusBrushData::SetGradientStops(T *brush,
+        const wxGraphicsGradientStops& stops)

 {
 {

-    m_brush = new LinearGradientBrush( PointF( x1,y1) , PointF( x2,y2),
-        Color( c1.Alpha(), c1.Red(),c1.Green() , c1.Blue() ),
-        Color( c2.Alpha(), c2.Red(),c2.Green() , c2.Blue() ));
+    const unsigned numStops = stops.GetCount();
+    if ( numStops <= 2 )
+    {
+        // initial and final colours are set during the brush creation, nothing
+        // more to do
+        return;
+    }
+
+    wxVector<Color> colors(numStops);
+    wxVector<REAL> positions(numStops);
+
+    for ( unsigned i = 0; i < numStops; i++ )
+    {
+        wxGraphicsGradientStop stop = stops.Item(i);
+
+        colors[i] = wxColourToColor(stop.GetColour());
+        positions[i] = stop.GetPosition();
+    }
+
+    brush->SetInterpolationColors(&colors[0], &positions[0], numStops);
+}
+
+void
+wxGDIPlusBrushData::CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
+                                              wxDouble x2, wxDouble y2,
+                                              const wxGraphicsGradientStops& stops)
+{
+    LinearGradientBrush * const
+        brush = new LinearGradientBrush(PointF(x1, y1) , PointF(x2, y2),
+                                        wxColourToColor(stops.GetStartColour()),
+                                        wxColourToColor(stops.GetEndColour()));
+    m_brush =  brush;
+
+    SetGradientStops(brush, stops);

 }
 
 }
 

-void wxGDIPlusBrushData::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
-                                               const wxColour &oColor, const wxColour &cColor)
+void
+wxGDIPlusBrushData::CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
+                                              wxDouble xc, wxDouble yc,
+                                              wxDouble radius,
+                                              const wxGraphicsGradientStops& stops)

 {
 {

-    // Create a path that consists of a single circle.

     m_brushPath = new GraphicsPath();
     m_brushPath = new GraphicsPath();

-    m_brushPath->AddEllipse( (REAL)(xc-radius), (REAL)(yc-radius), (REAL)(2*radius), (REAL)(2*radius));
+    m_brushPath->AddEllipse( (REAL)(xc-radius), (REAL)(yc-radius),
+                             (REAL)(2*radius), (REAL)(2*radius));

 
 

-    PathGradientBrush *b = new PathGradientBrush(m_brushPath);
-    m_brush = b;
-    b->SetCenterPoint( PointF(xo,yo));
-    b->SetCenterColor(Color( oColor.Alpha(), oColor.Red(),oColor.Green() , oColor.Blue() ));
+    PathGradientBrush * const brush = new PathGradientBrush(m_brushPath);
+    m_brush = brush;
+    brush->SetCenterPoint(PointF(xo, yo));
+    brush->SetCenterColor(wxColourToColor(stops.GetStartColour()));

 
 

-    Color colors[] = {Color( cColor.Alpha(), cColor.Red(),cColor.Green() , cColor.Blue() )};
+    const Color col(wxColourToColor(stops.GetEndColour()));

     int count = 1;
     int count = 1;

-    b->SetSurroundColors(colors, &count);
+    brush->SetSurroundColors(&col, &count);
+
+    SetGradientStops(brush, stops);

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------


@@ -642,8 +719,7 @@ wxGDIPlusFontData::wxGDIPlusFontData( wxGraphicsRenderer* renderer, const wxFont
     if ( font.GetWeight() == wxFONTWEIGHT_BOLD )
         style |= FontStyleBold;
     m_font = new Font( s , size , style );
     if ( font.GetWeight() == wxFONTWEIGHT_BOLD )
         style |= FontStyleBold;
     m_font = new Font( s , size , style );

-    m_textBrush = new SolidBrush( Color( col.Alpha() , col.Red() ,
-        col.Green() , col.Blue() ));
+    m_textBrush = new SolidBrush(wxColourToColor(col));

 }
 
 wxGDIPlusFontData::~wxGDIPlusFontData()
 }
 
 wxGDIPlusFontData::~wxGDIPlusFontData()


@@ -667,7 +743,7 @@ wxGDIPlusBitmapData::wxGDIPlusBitmapData( wxGraphicsRenderer* renderer, Bitmap*
     m_helper = NULL;
 }
 
     m_helper = NULL;
 }
 

-wxGDIPlusBitmapData::wxGDIPlusBitmapData( wxGraphicsRenderer* renderer, 
+wxGDIPlusBitmapData::wxGDIPlusBitmapData( wxGraphicsRenderer* renderer,

                         const wxBitmap &bmp) : wxGraphicsObjectRefData( renderer )
 {
     m_bitmap = NULL;
                         const wxBitmap &bmp) : wxGraphicsObjectRefData( renderer )
 {
     m_bitmap = NULL;


@@ -874,7 +950,7 @@ void wxGDIPlusPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *
     *h = bounds.Height;
 }
 
     *h = bounds.Height;
 }
 

-bool wxGDIPlusPathData::Contains( wxDouble x, wxDouble y, int fillStyle ) const
+bool wxGDIPlusPathData::Contains( wxDouble x, wxDouble y, wxPolygonFillMode fillStyle ) const

 {
     m_path->SetFillMode( fillStyle == wxODDEVEN_RULE ? FillModeAlternate : FillModeWinding);
     return m_path->IsVisible( (FLOAT) x,(FLOAT) y) == TRUE ;
 {
     m_path->SetFillMode( fillStyle == wxODDEVEN_RULE ? FillModeAlternate : FillModeWinding);
     return m_path->IsVisible( (FLOAT) x,(FLOAT) y) == TRUE ;


@@ -1106,40 +1182,49 @@ void wxGDIPlusContext::ResetClip()
 
 void wxGDIPlusContext::StrokeLines( size_t n, const wxPoint2DDouble *points)
 {
 
 void wxGDIPlusContext::StrokeLines( size_t n, const wxPoint2DDouble *points)
 {

-       if ( !m_pen.IsNull() )
-       {
-        wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );
-               Point *cpoints = new Point[n];
-               for (size_t i = 0; i < n; i++)
-               {
-                       cpoints[i].X = (int)(points[i].m_x );
-                       cpoints[i].Y = (int)(points[i].m_y );
+   if (m_composition == wxCOMPOSITION_DEST)
+        return;

 
 

-               } // for (size_t i = 0; i < n; i++)
-               m_context->DrawLines( ((wxGDIPlusPenData*)m_pen.GetGraphicsData())->GetGDIPlusPen() , cpoints , n ) ;
-               delete[] cpoints;
-       }
+   if ( !m_pen.IsNull() )
+   {
+       wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );
+       Point *cpoints = new Point[n];
+       for (size_t i = 0; i < n; i++)
+       {
+           cpoints[i].X = (int)(points[i].m_x );
+           cpoints[i].Y = (int)(points[i].m_y );
+
+       } // for (size_t i = 0; i < n; i++)
+       m_context->DrawLines( ((wxGDIPlusPenData*)m_pen.GetGraphicsData())->GetGDIPlusPen() , cpoints , n ) ;
+       delete[] cpoints;
+   }

 }
 
 }
 

-void wxGDIPlusContext::DrawLines( size_t n, const wxPoint2DDouble *points, int WXUNUSED(fillStyle) )
+void wxGDIPlusContext::DrawLines( size_t n, const wxPoint2DDouble *points, wxPolygonFillMode WXUNUSED(fillStyle) )

 {
 {

+   if (m_composition == wxCOMPOSITION_DEST)
+        return;
+

     wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );
     wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );

-       Point *cpoints = new Point[n];
-       for (size_t i = 0; i < n; i++)
-       {
-               cpoints[i].X = (int)(points[i].m_x );
-               cpoints[i].Y = (int)(points[i].m_y );
+    Point *cpoints = new Point[n];
+    for (size_t i = 0; i < n; i++)
+    {
+        cpoints[i].X = (int)(points[i].m_x );
+        cpoints[i].Y = (int)(points[i].m_y );

 
 

-       } // for (int i = 0; i < n; i++)
-       if ( !m_brush.IsNull() )
-               m_context->FillPolygon( ((wxGDIPlusBrushData*)m_brush.GetRefData())->GetGDIPlusBrush() , cpoints , n ) ;
-       if ( !m_pen.IsNull() )
-               m_context->DrawLines( ((wxGDIPlusPenData*)m_pen.GetGraphicsData())->GetGDIPlusPen() , cpoints , n ) ;
-       delete[] cpoints;
+    } // for (int i = 0; i < n; i++)
+    if ( !m_brush.IsNull() )
+        m_context->FillPolygon( ((wxGDIPlusBrushData*)m_brush.GetRefData())->GetGDIPlusBrush() , cpoints , n ) ;
+    if ( !m_pen.IsNull() )
+        m_context->DrawLines( ((wxGDIPlusPenData*)m_pen.GetGraphicsData())->GetGDIPlusPen() , cpoints , n ) ;
+    delete[] cpoints;

 }
 
 void wxGDIPlusContext::StrokePath( const wxGraphicsPath& path )
 {
 }
 
 void wxGDIPlusContext::StrokePath( const wxGraphicsPath& path )
 {

+   if (m_composition == wxCOMPOSITION_DEST)
+        return;
+

     if ( !m_pen.IsNull() )
     {
         wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );
     if ( !m_pen.IsNull() )
     {
         wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );


@@ -1147,8 +1232,11 @@ void wxGDIPlusContext::StrokePath( const wxGraphicsPath& path )
     }
 }
 
     }
 }
 

-void wxGDIPlusContext::FillPath( const wxGraphicsPath& path , int fillStyle )
+void wxGDIPlusContext::FillPath( const wxGraphicsPath& path , wxPolygonFillMode fillStyle )

 {
 {

+   if (m_composition == wxCOMPOSITION_DEST)
+        return;
+

     if ( !m_brush.IsNull() )
     {
         wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );
     if ( !m_brush.IsNull() )
     {
         wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );


@@ -1158,6 +1246,66 @@ void wxGDIPlusContext::FillPath( const wxGraphicsPath& path , int fillStyle )
     }
 }
 
     }
 }
 

+bool wxGDIPlusContext::SetAntialiasMode(wxAntialiasMode antialias)
+{
+    if (m_antialias == antialias)
+        return true;
+
+    m_antialias = antialias;
+
+    SmoothingMode antialiasMode;
+    switch (antialias)
+    {
+        case wxANTIALIAS_DEFAULT:
+            antialiasMode = SmoothingModeHighQuality;
+            break;
+        case wxANTIALIAS_NONE:
+            antialiasMode = SmoothingModeNone;
+            break;
+        default:
+            return false;
+    }
+    m_context->SetSmoothingMode(antialiasMode);
+    return true;
+}
+
+bool wxGDIPlusContext::SetCompositionMode(wxCompositionMode op)
+{
+    if ( m_composition == op )
+        return true;
+
+    m_composition = op;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return true;
+
+    CompositingMode cop;
+    switch (op)
+    {
+        case wxCOMPOSITION_SOURCE:
+            cop = CompositingModeSourceCopy;
+            break;
+        case wxCOMPOSITION_OVER:
+            cop = CompositingModeSourceOver;
+            break;
+        default:
+            return false;
+    }
+
+    m_context->SetCompositingMode(cop);
+    return true;
+}
+
+void wxGDIPlusContext::BeginLayer(wxDouble /* opacity */)
+{
+    // TODO
+}
+
+void wxGDIPlusContext::EndLayer()
+{
+    // TODO
+}
+

 void wxGDIPlusContext::Rotate( wxDouble angle )
 {
     m_context->RotateTransform( RadToDeg(angle) );
 void wxGDIPlusContext::Rotate( wxDouble angle )
 {
     m_context->RotateTransform( RadToDeg(angle) );


@@ -1188,6 +1336,9 @@ void wxGDIPlusContext::PopState()
 
 void wxGDIPlusContext::DrawBitmap( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 {
 
 void wxGDIPlusContext::DrawBitmap( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 {

+   if (m_composition == wxCOMPOSITION_DEST)
+        return;
+

     Bitmap* image = static_cast<wxGDIPlusBitmapData*>(bmp.GetRefData())->GetGDIPlusBitmap();
     if ( image )
     {
     Bitmap* image = static_cast<wxGDIPlusBitmapData*>(bmp.GetRefData())->GetGDIPlusBitmap();
     if ( image )
     {


@@ -1211,6 +1362,9 @@ void wxGDIPlusContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y,
 
 void wxGDIPlusContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 {
 
 void wxGDIPlusContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 {

+   if (m_composition == wxCOMPOSITION_DEST)
+        return;
+

     // the built-in conversion fails when there is alpha in the HICON (eg XP style icons), we can only
     // find out by looking at the bitmap data whether there really was alpha in it
     HICON hIcon = (HICON)icon.GetHICON();
     // the built-in conversion fails when there is alpha in the HICON (eg XP style icons), we can only
     // find out by looking at the bitmap data whether there really was alpha in it
     HICON hIcon = (HICON)icon.GetHICON();


@@ -1238,7 +1392,7 @@ void wxGDIPlusContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxD
 
         interim.LockBits(&bounds, ImageLockModeRead,
             interim.GetPixelFormat(),&data);
 
         interim.LockBits(&bounds, ImageLockModeRead,
             interim.GetPixelFormat(),&data);

-        
+

         bool hasAlpha = false;
         for ( size_t y = 0 ; y < height && !hasAlpha ; ++y)
         {
         bool hasAlpha = false;
         for ( size_t y = 0 ; y < height && !hasAlpha ; ++y)
         {


@@ -1270,16 +1424,34 @@ void wxGDIPlusContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxD
     DeleteObject(iconInfo.hbmMask);
 }
 
     DeleteObject(iconInfo.hbmMask);
 }
 

-void wxGDIPlusContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
+void wxGDIPlusContext::DoDrawFilledText(const wxString& str,
+                                        wxDouble x, wxDouble y,
+                                        const wxGraphicsBrush& brush)

 {
 {

-    wxCHECK_RET( !m_font.IsNull(), wxT("wxGDIPlusContext::DrawText - no valid font set") );
+   if (m_composition == wxCOMPOSITION_DEST)
+        return;
+
+    wxCHECK_RET( !m_font.IsNull(),
+                 wxT("wxGDIPlusContext::DrawText - no valid font set") );

 
     if ( str.IsEmpty())
         return ;
 
 
     if ( str.IsEmpty())
         return ;
 

-    wxWCharBuffer s = str.wc_str( *wxConvUI );
-    m_context->DrawString( s , -1 , ((wxGDIPlusFontData*)m_font.GetRefData())->GetGDIPlusFont() ,
-            PointF( x , y ) , StringFormat::GenericTypographic() , ((wxGDIPlusFontData*)m_font.GetRefData())->GetGDIPlusBrush() );
+    wxGDIPlusFontData * const
+        fontData = (wxGDIPlusFontData *)m_font.GetRefData();
+    wxGDIPlusBrushData * const
+        brushData = (wxGDIPlusBrushData *)brush.GetRefData();
+
+    m_context->DrawString
+               (
+                    str.wc_str(*wxConvUI),  // string to draw, always Unicode
+                    -1,                     // length: string is NUL-terminated
+                    fontData->GetGDIPlusFont(),
+                    PointF(x, y),
+                    StringFormat::GenericTypographic(),
+                    brushData ? brushData->GetGDIPlusBrush()
+                              : fontData->GetGDIPlusBrush()
+               );

 }
 
 void wxGDIPlusContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
 }
 
 void wxGDIPlusContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,


@@ -1318,7 +1490,7 @@ void wxGDIPlusContext::GetTextExtent( const wxString &str, wxDouble *width, wxDo
     {
         RectF layoutRect(0,0, 100000.0f, 100000.0f);
         StringFormat strFormat( StringFormat::GenericTypographic() );
     {
         RectF layoutRect(0,0, 100000.0f, 100000.0f);
         StringFormat strFormat( StringFormat::GenericTypographic() );

-        strFormat.SetFormatFlags( StringFormatFlagsMeasureTrailingSpaces | strFormat.GetFormatFlags() ); 
+        strFormat.SetFormatFlags( StringFormatFlagsMeasureTrailingSpaces | strFormat.GetFormatFlags() );

 
         RectF bounds ;
         m_context->MeasureString((const wchar_t *) s , wcslen(s) , f, layoutRect, &strFormat, &bounds ) ;
 
         RectF bounds ;
         m_context->MeasureString((const wchar_t *) s , wcslen(s) , f, layoutRect, &strFormat, &bounds ) ;


@@ -1345,27 +1517,41 @@ void wxGDIPlusContext::GetPartialTextExtents(const wxString& text, wxArrayDouble
     RectF layoutRect(0,0, 100000.0f, 100000.0f);
     StringFormat strFormat( StringFormat::GenericTypographic() );
 
     RectF layoutRect(0,0, 100000.0f, 100000.0f);
     StringFormat strFormat( StringFormat::GenericTypographic() );
 

-    CharacterRange* ranges = new CharacterRange[len] ;
-    Region* regions = new Region[len];
-    for( size_t i = 0 ; i < len ; ++i)
-    {
-        ranges[i].First = i ;
-        ranges[i].Length = 1 ;
-    }
-    strFormat.SetMeasurableCharacterRanges(len,ranges);
-    strFormat.SetFormatFlags( StringFormatFlagsMeasureTrailingSpaces | strFormat.GetFormatFlags() ); 
-    m_context->MeasureCharacterRanges(ws, -1 , f,layoutRect, &strFormat,1,regions) ;
+    size_t startPosition = 0;
+    size_t remainder = len;
+    const size_t maxSpan = 32;
+    CharacterRange* ranges = new CharacterRange[maxSpan] ;
+    Region* regions = new Region[maxSpan];

 
 

-    RectF bbox ;
-    for ( size_t i = 0 ; i < len ; ++i)
+    while( remainder > 0 )

     {
     {

-        regions[i].GetBounds(&bbox,m_context);
-        widths[i] = bbox.GetRight()-bbox.GetLeft();
+        size_t span = wxMin( maxSpan, remainder );
+
+        for( size_t i = 0 ; i < span ; ++i)
+        {
+            ranges[i].First = 0 ;
+            ranges[i].Length = startPosition+i+1 ;
+        }
+        strFormat.SetMeasurableCharacterRanges(span,ranges);
+        strFormat.SetFormatFlags( StringFormatFlagsMeasureTrailingSpaces | strFormat.GetFormatFlags() );
+        m_context->MeasureCharacterRanges(ws, -1 , f,layoutRect, &strFormat,span,regions) ;
+
+        RectF bbox ;
+        for ( size_t i = 0 ; i < span ; ++i)
+        {
+            regions[i].GetBounds(&bbox,m_context);
+            widths[startPosition+i] = bbox.Width;
+        }
+        remainder -= span;
+        startPosition += span;

     }
     }

+
+    delete[] ranges;
+    delete[] regions;

 }
 
 bool wxGDIPlusContext::ShouldOffset() const
 }
 
 bool wxGDIPlusContext::ShouldOffset() const

-{     
+{

     int penwidth = 0 ;
     if ( !m_pen.IsNull() )
     {
     int penwidth = 0 ;
     if ( !m_pen.IsNull() )
     {


@@ -1434,7 +1620,7 @@ public :
     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
 
     virtual wxGraphicsContext * CreateContext( const wxPrinterDC& dc);
     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
 
     virtual wxGraphicsContext * CreateContext( const wxPrinterDC& dc);

-    
+

     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
 
     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
 
     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );


@@ -1457,21 +1643,25 @@ public :
 
     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
 
 
     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
 

-    // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
-    virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
-        const wxColour&c1, const wxColour&c2) ;
-
-    // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
-    // with radius r and color cColor
-    virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
-        const wxColour &oColor, const wxColour &cColor) ;
+    virtual wxGraphicsBrush
+    CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
+                              wxDouble x2, wxDouble y2,
+                              const wxGraphicsGradientStops& stops);

 
 

+    virtual wxGraphicsBrush
+    CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
+                              wxDouble xc, wxDouble yc,
+                              wxDouble radius,
+                              const wxGraphicsGradientStops& stops);

     // sets the font
     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
 
     // create a native bitmap representation
     virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap );
     // sets the font
     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
 
     // create a native bitmap representation
     virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap );

-    
+
+    // create a graphics bitmap from a native bitmap
+    virtual wxGraphicsBitmap CreateBitmapFromNativeBitmap( void* bitmap );
+

     // create a subimage from a native image representation
     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  );
 
     // create a subimage from a native image representation
     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  );
 


@@ -1647,27 +1837,29 @@ wxGraphicsBrush wxGDIPlusRenderer::CreateBrush(const wxBrush& brush )
     }
 }
 
     }
 }
 

-// sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
-wxGraphicsBrush wxGDIPlusRenderer::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
-                                                                      const wxColour&c1, const wxColour&c2)
+wxGraphicsBrush
+wxGDIPlusRenderer::CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
+                                             wxDouble x2, wxDouble y2,
+                                             const wxGraphicsGradientStops& stops)

 {
     ENSURE_LOADED_OR_RETURN(wxNullGraphicsBrush);
     wxGraphicsBrush p;
     wxGDIPlusBrushData* d = new wxGDIPlusBrushData( this );
 {
     ENSURE_LOADED_OR_RETURN(wxNullGraphicsBrush);
     wxGraphicsBrush p;
     wxGDIPlusBrushData* d = new wxGDIPlusBrushData( this );

-    d->CreateLinearGradientBrush(x1, y1, x2, y2, c1, c2);
+    d->CreateLinearGradientBrush(x1, y1, x2, y2, stops);

     p.SetRefData(d);
     return p;
  }
 
     p.SetRefData(d);
     return p;
  }
 

-// sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
-// with radius r and color cColor
-wxGraphicsBrush wxGDIPlusRenderer::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
-                                                                      const wxColour &oColor, const wxColour &cColor)
+wxGraphicsBrush
+wxGDIPlusRenderer::CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
+                                             wxDouble xc, wxDouble yc,
+                                             wxDouble radius,
+                                             const wxGraphicsGradientStops& stops)

 {
     ENSURE_LOADED_OR_RETURN(wxNullGraphicsBrush);
     wxGraphicsBrush p;
     wxGDIPlusBrushData* d = new wxGDIPlusBrushData( this );
 {
     ENSURE_LOADED_OR_RETURN(wxNullGraphicsBrush);
     wxGraphicsBrush p;
     wxGDIPlusBrushData* d = new wxGDIPlusBrushData( this );

-    d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
+    d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,stops);

     p.SetRefData(d);
     return p;
 }
     p.SetRefData(d);
     return p;
 }


@@ -1699,6 +1891,19 @@ wxGraphicsBitmap wxGDIPlusRenderer::CreateBitmap( const wxBitmap &bitmap )
         return wxNullGraphicsBitmap;
 }
 
         return wxNullGraphicsBitmap;
 }
 

+wxGraphicsBitmap wxGDIPlusRenderer::CreateBitmapFromNativeBitmap( void *bitmap )
+{
+    ENSURE_LOADED_OR_RETURN(wxNullGraphicsBitmap);
+    if ( bitmap != NULL )
+    {
+        wxGraphicsBitmap p;
+        p.SetRefData(new wxGDIPlusBitmapData( this , (Bitmap*) bitmap ));
+        return p;
+    }
+    else
+        return wxNullGraphicsBitmap;
+}
+

 wxGraphicsBitmap wxGDIPlusRenderer::CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  )
 {
     ENSURE_LOADED_OR_RETURN(wxNullGraphicsBitmap);
 wxGraphicsBitmap wxGDIPlusRenderer::CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  )
 {
     ENSURE_LOADED_OR_RETURN(wxNullGraphicsBitmap);


@@ -1726,4 +1931,32 @@ private:
 
 IMPLEMENT_DYNAMIC_CLASS(wxGDIPlusRendererModule, wxModule)
 
 
 IMPLEMENT_DYNAMIC_CLASS(wxGDIPlusRendererModule, wxModule)
 

+// ----------------------------------------------------------------------------
+// wxMSW-specific parts of wxGCDC
+// ----------------------------------------------------------------------------
+
+WXHDC wxGCDC::AcquireHDC()
+{
+    wxGraphicsContext * const gc = GetGraphicsContext();
+    if ( !gc )
+        return NULL;
+
+    Graphics * const g = static_cast<Graphics *>(gc->GetNativeContext());
+    return g ? g->GetHDC() : NULL;
+}
+
+void wxGCDC::ReleaseHDC(WXHDC hdc)
+{
+    if ( !hdc )
+        return;
+
+    wxGraphicsContext * const gc = GetGraphicsContext();
+    wxCHECK_RET( gc, "can't release HDC because there is no wxGraphicsContext" );
+
+    Graphics * const g = static_cast<Graphics *>(gc->GetNativeContext());
+    wxCHECK_RET( g, "can't release HDC because there is no Graphics" );
+
+    g->ReleaseHDC((HDC)hdc);
+}
+

 #endif  // wxUSE_GRAPHICS_CONTEXT
 #endif  // wxUSE_GRAPHICS_CONTEXT