]> git.saurik.com Git - wxWidgets.git/blobdiff - src/osx/carbon/graphics.cpp
Implement native OS X ComboBox for OS X Cocoa, and implement wxTextEntry methods...
[wxWidgets.git] / src / osx / carbon / graphics.cpp
index 416880038a46f015172b04ed6314e496d15348a9..03fd9e2c50c19fd0c05397a6c1190fa0a3538478 100644 (file)
@@ -5,7 +5,7 @@
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
-// Copyright:   (c) Stefan Csomor
+// copyright:   (c) Stefan Csomor
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
     #include "wx/osx/dcprint.h"
     #include "wx/osx/dcclient.h"
     #include "wx/osx/dcmemory.h"
-#if wxOSX_USE_CARBON
-#include "wx/osx/uma.h"
-#else
-#include "wx/osx/private.h"
-#endif
-
+    #include "wx/osx/private.h"
 #else
     #include "CoreServices/CoreServices.h"
     #include "ApplicationServices/ApplicationServices.h"
@@ -77,11 +72,42 @@ int UMAGetSystemVersion()
 #endif
 
 #if wxOSX_USE_COCOA_OR_IPHONE
-extern CGContextRef wxOSXGetContextFromCurrentNSContext() ;
-extern void wxOSXLockFocus( WXWidget view) ;
+extern CGContextRef wxOSXGetContextFromCurrentContext() ;
+#if wxOSX_USE_COCOA
+extern bool wxOSXLockFocus( WXWidget view) ;
 extern void wxOSXUnlockFocus( WXWidget view) ;
 #endif
+#endif
+
+#if 1 // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
+
+// TODO test whether this private API also works under 10.3
+
+// copying values from NSCompositingModes (see also webkit and cairo sources)
+
+typedef enum CGCompositeOperation {
+   kCGCompositeOperationClear           = 0,
+   kCGCompositeOperationCopy            = 1,
+   kCGCompositeOperationSourceOver      = 2,
+   kCGCompositeOperationSourceIn        = 3,
+   kCGCompositeOperationSourceOut       = 4,
+   kCGCompositeOperationSourceAtop      = 5,
+   kCGCompositeOperationDestinationOver = 6,
+   kCGCompositeOperationDestinationIn   = 7,
+   kCGCompositeOperationDestinationOut  = 8,
+   kCGCompositeOperationDestinationAtop = 9,
+   kCGCompositeOperationXOR             = 10,
+   kCGCompositeOperationPlusDarker      = 11,
+// NS only, unsupported by CG : Highlight
+   kCGCompositeOperationPlusLighter     = 12
+} CGCompositeOperation ;
+
+extern "C"
+{
+   CG_EXTERN void CGContextSetCompositeOperation (CGContextRef context, int operation);
+} ;
 
+#endif
 
 //-----------------------------------------------------------------------------
 // constants
@@ -147,7 +173,7 @@ CGColorRef wxMacCreateCGColor( const wxColour& col )
 CTFontRef wxMacCreateCTFont( const wxFont& font )
 {
 #ifdef __WXMAC__
-    return wxCFRetain((CTFontRef) font.MacGetCTFont());
+    return wxCFRetain((CTFontRef) font.OSXGetCTFont());
 #else
     return CTFontCreateWithName( wxCFStringRef( font.GetFaceName(), wxLocale::GetSystemEncoding() ) , font.GetPointSize() , NULL );
 #endif
@@ -427,32 +453,32 @@ wxMacCoreGraphicsPenData::wxMacCoreGraphicsPenData( wxGraphicsRenderer* renderer
 
     switch ( pen.GetStyle() )
     {
-        case wxSOLID :
+        case wxPENSTYLE_SOLID:
             break;
 
-        case wxDOT :
+        case wxPENSTYLE_DOT:
             m_count = WXSIZEOF(dotted);
             m_userLengths = new CGFloat[ m_count ] ;
             memcpy( m_userLengths, dotted, sizeof(dotted) );
             m_lengths = m_userLengths;
             break;
 
-        case wxLONG_DASH :
+        case wxPENSTYLE_LONG_DASH:
             m_count = WXSIZEOF(dashed);
             m_lengths = dashed;
             break;
 
-        case wxSHORT_DASH :
+        case wxPENSTYLE_SHORT_DASH:
             m_count = WXSIZEOF(short_dashed);
             m_lengths = short_dashed;
             break;
 
-        case wxDOT_DASH :
+        case wxPENSTYLE_DOT_DASH:
             m_count = WXSIZEOF(dotted_dashed);
             m_lengths = dotted_dashed;
             break;
 
-        case wxUSER_DASH :
+        case wxPENSTYLE_USER_DASH:
             wxDash *dashes;
             m_count = pen.GetDashes( &dashes );
             if ((dashes != NULL) && (m_count > 0))
@@ -471,7 +497,7 @@ wxMacCoreGraphicsPenData::wxMacCoreGraphicsPenData( wxGraphicsRenderer* renderer
             m_lengths = m_userLengths;
             break;
 
-        case wxSTIPPLE :
+        case wxPENSTYLE_STIPPLE:
             {
                 wxBitmap* bmp = pen.GetStipple();
                 if ( bmp && bmp->Ok() )
@@ -539,12 +565,7 @@ void wxMacCoreGraphicsPenData::Apply( wxGraphicsContext* context )
     }
     else
     {
-        if ( context->GetLogicalFunction() == wxINVERT || context->GetLogicalFunction() == wxXOR )
-        {
-            CGContextSetRGBStrokeColor( cg , (CGFloat) 1.0,(CGFloat)  1.0 , (CGFloat) 1.0, (CGFloat) 1.0 );
-        }
-        else
-            CGContextSetStrokeColorWithColor( cg , m_color );
+        CGContextSetStrokeColorWithColor( cg , m_color );
     }
 }
 
@@ -552,20 +573,6 @@ void wxMacCoreGraphicsPenData::Apply( wxGraphicsContext* context )
 // Brush
 //
 
-static const char *gs_stripedback_xpm[] = {
-/* columns rows colors chars-per-pixel */
-"4 4 2 1",
-". c #F0F0F0",
-"X c #ECECEC",
-/* pixels */
-"....",
-"....",
-"XXXX",
-"XXXX"
-};
-
-wxBitmap gs_stripedback_bmp( wxImage( (const char* const* ) gs_stripedback_xpm  ), -1 ) ;
-
 // make sure we all use one class for all conversions from wx to native colour
 
 class wxMacCoreGraphicsColour
@@ -796,7 +803,7 @@ public:
     virtual ATSUStyle GetATSUStyle() { return m_macATSUIStyle; }
 #endif
 #if wxOSX_USE_CORE_TEXT
-    CTFontRef GetCTFont() const { return m_ctFont ; }
+    CTFontRef OSXGetCTFont() const { return m_ctFont ; }
 #endif
     wxColour GetColour() const { return m_colour ; }
 
@@ -840,7 +847,7 @@ wxMacCoreGraphicsFontData::wxMacCoreGraphicsFontData(wxGraphicsRenderer* rendere
 
     // we need the scale here ...
 
-    Fixed atsuSize = IntToFixed( int( 1 * font.MacGetFontSize()) );
+    Fixed atsuSize = IntToFixed( int( 1 * font.GetPointSize()) );
     RGBColor atsuColor ;
     col.GetRGBColor( &atsuColor );
     ATSUAttributeTag atsuTags[] =
@@ -848,19 +855,19 @@ wxMacCoreGraphicsFontData::wxMacCoreGraphicsFontData(wxGraphicsRenderer* rendere
             kATSUSizeTag ,
             kATSUColorTag ,
     };
-    ByteCount atsuSizes[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
+    ByteCount atsuSizes[WXSIZEOF(atsuTags)] =
     {
             sizeof( Fixed ) ,
             sizeof( RGBColor ) ,
     };
-    ATSUAttributeValuePtr atsuValues[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
+    ATSUAttributeValuePtr atsuValues[WXSIZEOF(atsuTags)] =
     {
             &atsuSize ,
             &atsuColor ,
     };
 
     status = ::ATSUSetAttributes(
-        m_macATSUIStyle, sizeof(atsuTags) / sizeof(ATSUAttributeTag) ,
+        m_macATSUIStyle, WXSIZEOF(atsuTags),
         atsuTags, atsuSizes, atsuValues);
 
     wxASSERT_MSG( status == noErr , wxT("couldn't modify ATSU style") );
@@ -1131,9 +1138,12 @@ public :
     // appends a rectangle as a new closed subpath
     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 
-    // appends an ellipsis as a new closed subpath fitting the passed rectangle
+    // appends a circle as a new closed subpath 
     virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r );
 
+    // appends an ellipsis as a new closed subpath fitting the passed rectangle
+    virtual void AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
+
     // draws a an arc to two tangents connecting (current) to (x1,y1) and (x1,y1) to (x2,y2), also a straight line from (current) to (x1,y1)
     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r );
 
@@ -1210,7 +1220,12 @@ void wxMacCoreGraphicsPathData::AddRectangle( wxDouble x, wxDouble y, wxDouble w
 
 void wxMacCoreGraphicsPathData::AddCircle( wxDouble x, wxDouble y , wxDouble r )
 {
-    CGPathAddArc( m_path , NULL , (CGFloat) x , (CGFloat) y , (CGFloat) r , (CGFloat) 0.0 , (CGFloat) (2 * M_PI) , true );
+    CGPathAddEllipseInRect( m_path, NULL, CGRectMake(x-r,y-r,2*r,2*r));
+}
+
+void wxMacCoreGraphicsPathData::AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
+{
+    CGPathAddEllipseInRect( m_path, NULL, CGRectMake(x,y,w,h));
 }
 
 // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
@@ -1321,7 +1336,14 @@ public:
 
     virtual void * GetNativeContext();
 
-    bool SetLogicalFunction( wxRasterOperationMode function );
+    virtual bool SetAntialiasMode(wxAntialiasMode antialias);
+
+    virtual bool SetCompositionMode(wxCompositionMode op);
+
+    virtual void BeginLayer(wxDouble opacity);
+
+    virtual void EndLayer();
+
     //
     // transformation
     //
@@ -1391,7 +1413,7 @@ public:
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxMacCoreGraphicsContext)
 
 private:
-    void EnsureIsValid();
+    bool EnsureIsValid();
 
     virtual void DoDrawText( const wxString &str, wxDouble x, wxDouble y );
     virtual void DoDrawRotatedText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle );
@@ -1406,6 +1428,7 @@ private:
     CGAffineTransform m_windowTransform;
     wxDouble m_width;
     wxDouble m_height;
+    bool m_invisible;
 
 #if wxOSX_USE_COCOA_OR_CARBON
     wxCFRef<HIShapeRef> m_clipRgn;
@@ -1462,6 +1485,7 @@ void wxMacCoreGraphicsContext::Init()
 #if wxOSX_USE_COCOA_OR_IPHONE
     m_view = NULL;
 #endif
+    m_invisible = false;
 }
 
 wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer, CGContextRef cgcontext, wxDouble width, wxDouble height ) : wxGraphicsContext(renderer)
@@ -1491,12 +1515,14 @@ wxMacCoreGraphicsContext::wxMacCoreGraphicsContext( wxGraphicsRenderer* renderer
 #if wxOSX_USE_COCOA_OR_IPHONE
     m_view = window->GetHandle();
 
-    if ( !((wxWidgetCocoaImpl*) window->GetPeer())->IsFlipped() )
+#if wxOSX_USE_COCOA
+    if ( ! window->GetPeer()->IsFlipped() )
     {
         m_windowTransform = CGAffineTransformMakeTranslation( 0 , m_height );
         m_windowTransform = CGAffineTransformScale( m_windowTransform , 1 , -1 );
     }
     else
+#endif
     {
         m_windowTransform = CGAffineTransformIdentity;
     }
@@ -1527,12 +1553,6 @@ wxMacCoreGraphicsContext::wxMacCoreGraphicsContext() : wxGraphicsContext(NULL)
 wxMacCoreGraphicsContext::~wxMacCoreGraphicsContext()
 {
     SetNativeContext(NULL);
-#if wxOSX_USE_COCOA_OR_IPHONE
-    if ( m_view )
-    {
-        CGContextFlush(m_cgContext);
-    }
-#endif
 }
 
 void wxMacCoreGraphicsContext::GetSize( wxDouble* width, wxDouble* height)
@@ -1565,13 +1585,30 @@ void wxMacCoreGraphicsContext::Flush()
     CGContextFlush(m_cgContext);
 }
 
-void wxMacCoreGraphicsContext::EnsureIsValid()
+bool wxMacCoreGraphicsContext::EnsureIsValid()
 {
     if ( !m_cgContext )
     {
-#if wxOSX_USE_COCOA_OR_IPHONE
-        wxOSXLockFocus(m_view);
-        m_cgContext = wxOSXGetContextFromCurrentNSContext();
+        if (m_invisible)
+            return false;
+
+#if wxOSX_USE_COCOA
+        if ( wxOSXLockFocus(m_view) )
+        {
+            m_cgContext = wxOSXGetContextFromCurrentContext();
+            wxASSERT_MSG( m_cgContext != NULL, wxT("Unable to retrieve drawing context from View"));
+        }
+        else
+        {
+            m_invisible = true;
+        }
+#endif
+#if wxOSX_USE_IPHONE
+        m_cgContext = wxOSXGetContextFromCurrentContext();
+        if ( m_cgContext == NULL )
+        {
+            m_invisible = true;
+        }
 #endif
 #if wxOSX_USE_CARBON
         OSStatus status = QDBeginCGContext( GetWindowPort( m_windowRef ) , &m_cgContext );
@@ -1580,110 +1617,211 @@ void wxMacCoreGraphicsContext::EnsureIsValid()
             wxFAIL_MSG("Cannot nest wxDCs on the same window");
         }
 #endif
-        CGContextConcatCTM( m_cgContext, m_windowTransform );
-        CGContextSaveGState( m_cgContext );
-        m_contextSynthesized = true;
-        if ( m_clipRgn.get() )
+        if ( m_cgContext )
         {
-            // the clip region is in device coordinates, so we convert this again to user coordinates
-            wxCFRef<HIMutableShapeRef> hishape( HIShapeCreateMutableCopy( m_clipRgn ) );
-            CGPoint transformedOrigin = CGPointApplyAffineTransform( CGPointZero,m_windowTransform);
-            HIShapeOffset( hishape, -transformedOrigin.x, -transformedOrigin.y );
-            // if the shape is empty, HIShapeReplacePathInCGContext doesn't work
-            if ( HIShapeIsEmpty(hishape))
+            CGContextSaveGState( m_cgContext );
+            CGContextConcatCTM( m_cgContext, m_windowTransform );
+            CGContextSetTextMatrix( m_cgContext, CGAffineTransformIdentity );
+            m_contextSynthesized = true;
+#if wxOSX_USE_COCOA_OR_CARBON
+            if ( m_clipRgn.get() )
             {
-                CGRect empty = CGRectMake( 0,0,0,0 );
-                CGContextClipToRect( m_cgContext, empty );
+                // the clip region is in device coordinates, so we convert this again to user coordinates
+                wxCFRef<HIMutableShapeRef> hishape( HIShapeCreateMutableCopy( m_clipRgn ) );
+                CGPoint transformedOrigin = CGPointApplyAffineTransform( CGPointZero,m_windowTransform);
+                HIShapeOffset( hishape, -transformedOrigin.x, -transformedOrigin.y );
+                // if the shape is empty, HIShapeReplacePathInCGContext doesn't work
+                if ( HIShapeIsEmpty(hishape))
+                {
+                    CGRect empty = CGRectMake( 0,0,0,0 );
+                    CGContextClipToRect( m_cgContext, empty );
+                }
+                else
+                {
+                    HIShapeReplacePathInCGContext( hishape, m_cgContext );
+                    CGContextClip( m_cgContext );
+                }
             }
-            else
+#endif
+            CGContextSaveGState( m_cgContext );
+
+#if 0 // turn on for debugging of clientdc
+            static float color = 0.5 ;
+            static int channel = 0 ;
+            CGRect bounds = CGRectMake(-1000,-1000,2000,2000);
+            CGContextSetRGBFillColor( m_cgContext, channel == 0 ? color : 0.5 ,
+                channel == 1 ? color : 0.5 , channel == 2 ? color : 0.5 , 1 );
+            CGContextFillRect( m_cgContext, bounds );
+            color += 0.1 ;
+            if ( color > 0.9 )
             {
-                HIShapeReplacePathInCGContext( hishape, m_cgContext );
-                CGContextClip( m_cgContext );
+                color = 0.5 ;
+                channel++ ;
+                if ( channel == 3 )
+                    channel = 0 ;
             }
-        }
-        CGContextSaveGState( m_cgContext );
-        
-#if 0 // turn on for debugging of clientdc
-        static float color = 0.5 ;
-        static int channel = 0 ;
-        CGRect bounds = CGRectMake(-1000,-1000,2000,2000);
-        CGContextSetRGBFillColor( m_cgContext, channel == 0 ? color : 0.5 ,
-            channel == 1 ? color : 0.5 , channel == 2 ? color : 0.5 , 1 );
-        CGContextFillRect( m_cgContext, bounds );
-        color += 0.1 ;
-        if ( color > 0.9 )
-        {
-            color = 0.5 ;
-            channel++ ;
-            if ( channel == 3 )
-                channel = 0 ;
-        }
 #endif
+        }
     }
+    return m_cgContext != NULL;
 }
 
-// TODO test whether the private CGContextSetCompositeOperation works under 10.3 (using NSCompositingModes)
+bool wxMacCoreGraphicsContext::SetAntialiasMode(wxAntialiasMode antialias)
+{
+    if (!EnsureIsValid())
+        return true;
 
-bool wxMacCoreGraphicsContext::SetLogicalFunction( wxRasterOperationMode function )
+    if (m_antialias == antialias)
+        return true;
+
+    m_antialias = antialias;
+
+    bool antialiasMode;
+    switch (antialias)
+    {
+        case wxANTIALIAS_DEFAULT:
+            antialiasMode = true;
+            break;
+        case wxANTIALIAS_NONE:
+            antialiasMode = false;
+            break;
+        default:
+            return false;
+    }
+    CGContextSetShouldAntialias(m_cgContext, antialiasMode);
+    return true;
+}
+
+bool wxMacCoreGraphicsContext::SetCompositionMode(wxCompositionMode op)
 {
-    if (m_logicalFunction == function)
+    if (!EnsureIsValid())
         return true;
 
-    EnsureIsValid();
+    if ( m_composition == op )
+        return true;
 
-    bool retval = false;
-    bool shouldAntiAlias = true;
-    CGBlendMode mode = kCGBlendModeNormal;
+    m_composition = op;
 
-#if defined(__WXMAC__) && ( wxOSX_USE_IPHONE || ( MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5 ) )
-#if wxOSX_USE_IPHONE
-    if ( 1 )
-#else
-    if ( UMAGetSystemVersion() >= 0x1050 )
-#endif
+    if (m_composition == wxCOMPOSITION_DEST)
+        return true;
+
+#if wxOSX_USE_COCOA_OR_CARBON
+    if ( UMAGetSystemVersion() < 0x1060 )
     {
-        retval = true;
-        switch ( function )
+        CGCompositeOperation cop = kCGCompositeOperationSourceOver;
+        CGBlendMode mode = kCGBlendModeNormal;
+        switch( op )
         {
-            // TODO find best corresponding porter duff modes
-            case wxCOPY :
-                mode = kCGBlendModeCopy;
-                break;
-            case wxCLEAR :
-                mode = kCGBlendModeClear;
-                break;
-            case wxXOR :
-                mode = kCGBlendModeXOR;
-                shouldAntiAlias = false;
-                break;
-            default :
-                retval = false;
-                break;
+        case wxCOMPOSITION_CLEAR:
+            cop = kCGCompositeOperationClear;
+            break;
+        case wxCOMPOSITION_SOURCE:
+            cop = kCGCompositeOperationCopy;
+            break;
+        case wxCOMPOSITION_OVER:
+            mode = kCGBlendModeNormal;
+            break;
+        case wxCOMPOSITION_IN:
+            cop = kCGCompositeOperationSourceIn;
+            break;
+        case wxCOMPOSITION_OUT:
+            cop = kCGCompositeOperationSourceOut;
+            break;
+        case wxCOMPOSITION_ATOP:
+            cop = kCGCompositeOperationSourceAtop;
+            break;
+        case wxCOMPOSITION_DEST_OVER:
+            cop = kCGCompositeOperationDestinationOver;
+            break;
+        case wxCOMPOSITION_DEST_IN:
+            cop = kCGCompositeOperationDestinationIn;
+            break;
+        case wxCOMPOSITION_DEST_OUT:
+            cop = kCGCompositeOperationDestinationOut;
+            break;
+        case wxCOMPOSITION_DEST_ATOP:
+           cop = kCGCompositeOperationDestinationAtop;
+            break;
+        case wxCOMPOSITION_XOR:
+            cop = kCGCompositeOperationXOR;
+            break;
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
+        case wxCOMPOSITION_ADD:
+            mode = kCGBlendModePlusLighter ;
+            break;
+#endif
+        default:
+            return false;
         }
+        if ( cop != kCGCompositeOperationSourceOver )
+            CGContextSetCompositeOperation(m_cgContext, cop);
+        else
+            CGContextSetBlendMode(m_cgContext, mode);
     }
-    else
 #endif
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
+    else
     {
-        if ( function == wxCOPY )
+        CGBlendMode mode = kCGBlendModeNormal;
+        switch( op )
         {
-            retval = true;
-        }
-        else if ( function == wxINVERT || function == wxXOR )
-        {
-            // change color to white
-            mode = kCGBlendModeExclusion;
-            shouldAntiAlias = false;
-            retval = true;
+        case wxCOMPOSITION_CLEAR:
+            mode = kCGBlendModeClear;
+            break;
+        case wxCOMPOSITION_SOURCE:
+            mode = kCGBlendModeCopy;
+            break;
+        case wxCOMPOSITION_OVER:
+            mode = kCGBlendModeNormal;
+            break;
+        case wxCOMPOSITION_IN:
+            mode = kCGBlendModeSourceIn;
+            break;
+        case wxCOMPOSITION_OUT:
+            mode = kCGBlendModeSourceOut;
+            break;
+        case wxCOMPOSITION_ATOP:
+            mode = kCGBlendModeSourceAtop;
+            break;
+        case wxCOMPOSITION_DEST_OVER:
+            mode = kCGBlendModeDestinationOver;
+            break;
+        case wxCOMPOSITION_DEST_IN:
+            mode = kCGBlendModeDestinationIn;
+            break;
+        case wxCOMPOSITION_DEST_OUT:
+            mode = kCGBlendModeDestinationOut;
+            break;
+        case wxCOMPOSITION_DEST_ATOP:
+           mode = kCGBlendModeDestinationAtop;
+            break;
+        case wxCOMPOSITION_XOR:
+            mode = kCGBlendModeXOR;
+            break;
+
+        case wxCOMPOSITION_ADD:
+            mode = kCGBlendModePlusLighter ;
+            break;
+        default:
+            return false;
         }
+        CGContextSetBlendMode(m_cgContext, mode);
     }
+#endif
+    return true;
+}
 
-    if (retval)
-    {
-        m_logicalFunction = function;
-        CGContextSetBlendMode( m_cgContext, mode );
-        CGContextSetShouldAntialias(m_cgContext, shouldAntiAlias);
-    }
-    return retval ;
+void wxMacCoreGraphicsContext::BeginLayer(wxDouble opacity)
+{
+    CGContextSaveGState(m_cgContext);
+    CGContextSetAlpha(m_cgContext, (CGFloat) opacity);
+    CGContextBeginTransparencyLayer(m_cgContext, 0);
+}
+
+void wxMacCoreGraphicsContext::EndLayer()
+{
+    CGContextEndTransparencyLayer(m_cgContext);
+    CGContextRestoreGState(m_cgContext);
 }
 
 void wxMacCoreGraphicsContext::Clip( const wxRegion &region )
@@ -1773,7 +1911,11 @@ void wxMacCoreGraphicsContext::StrokePath( const wxGraphicsPath &path )
     if ( m_pen.IsNull() )
         return ;
 
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return;
 
     wxQuartzOffsetHelper helper( m_cgContext , ShouldOffset() );
 
@@ -1784,6 +1926,12 @@ void wxMacCoreGraphicsContext::StrokePath( const wxGraphicsPath &path )
 
 void wxMacCoreGraphicsContext::DrawPath( const wxGraphicsPath &path , wxPolygonFillMode fillStyle )
 {
+    if (!EnsureIsValid())
+        return;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return;
+
     if ( !m_brush.IsNull() && ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->IsShading() )
     {
         // when using shading, we cannot draw pen and brush at the same time
@@ -1818,8 +1966,6 @@ void wxMacCoreGraphicsContext::DrawPath( const wxGraphicsPath &path , wxPolygonF
         }
     }
 
-    EnsureIsValid();
-
     if ( !m_brush.IsNull() )
         ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->Apply(this);
     if ( !m_pen.IsNull() )
@@ -1836,7 +1982,11 @@ void wxMacCoreGraphicsContext::FillPath( const wxGraphicsPath &path , wxPolygonF
     if ( m_brush.IsNull() )
         return;
 
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return;
 
     if ( ((wxMacCoreGraphicsBrushData*)m_brush.GetRefData())->IsShading() )
     {
@@ -1868,13 +2018,10 @@ void wxMacCoreGraphicsContext::SetNativeContext( CGContextRef cg )
         CGContextRestoreGState( m_cgContext );
         if ( m_contextSynthesized )
         {
-            // TODO: in case of performance problems, try issuing this not too 
-            // frequently (half of refresh rate)
-            CGContextFlush(m_cgContext);
 #if wxOSX_USE_CARBON
             QDEndCGContext( GetWindowPort( m_windowRef ) , &m_cgContext);
 #endif
-#if wxOSX_USE_COCOA_OR_IPHONE
+#if wxOSX_USE_COCOA
             wxOSXUnlockFocus(m_view);
 #endif
         }
@@ -1933,7 +2080,12 @@ void wxMacCoreGraphicsContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDo
 
 void wxMacCoreGraphicsContext::DrawBitmap( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 {
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return;
+
 #ifdef __WXMAC__
     wxMacCoreGraphicsBitmapData* refdata  =static_cast<wxMacCoreGraphicsBitmapData*>(bmp.GetRefData());
     CGImageRef image = refdata->GetBitmap();
@@ -1970,29 +2122,35 @@ void wxMacCoreGraphicsContext::DrawBitmap( const wxGraphicsBitmap &bmp, wxDouble
 
 void wxMacCoreGraphicsContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
 {
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return;
 
     CGRect r = CGRectMake( (CGFloat) 0.0 , (CGFloat) 0.0 , (CGFloat) w , (CGFloat) h );
     CGContextSaveGState( m_cgContext );
     CGContextTranslateCTM( m_cgContext,(CGFloat) x ,(CGFloat) (y + h) );
     CGContextScaleCTM( m_cgContext, 1, -1 );
-#if wxOSX_USE_CARBON
+#if wxOSX_USE_COCOA_OR_CARBON
     PlotIconRefInContext( m_cgContext , &r , kAlignNone , kTransformNone ,
-        NULL , kPlotIconRefNormalFlags , MAC_WXHICON( icon.GetHICON() ) );
+        NULL , kPlotIconRefNormalFlags , icon.GetHICON() );
 #endif
     CGContextRestoreGState( m_cgContext );
 }
 
 void wxMacCoreGraphicsContext::PushState()
 {
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
 
     CGContextSaveGState( m_cgContext );
 }
 
 void wxMacCoreGraphicsContext::PopState()
 {
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
 
     CGContextRestoreGState( m_cgContext );
 }
@@ -2001,13 +2159,18 @@ void wxMacCoreGraphicsContext::DoDrawText( const wxString &str, wxDouble x, wxDo
 {
     wxCHECK_RET( !m_font.IsNull(), wxT("wxMacCoreGraphicsContext::DrawText - no valid font set") );
 
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return;
+
 #if wxOSX_USE_CORE_TEXT
     if ( UMAGetSystemVersion() >= 0x1050 )
     {
         wxMacCoreGraphicsFontData* fref = (wxMacCoreGraphicsFontData*)m_font.GetRefData();
         wxCFStringRef text(str, wxLocale::GetSystemEncoding() );
-        CTFontRef font = fref->GetCTFont();
+        CTFontRef font = fref->OSXGetCTFont();
         CGColorRef col = wxMacCreateCGColor( fref->GetColour() );
         CTUnderlineStyle ustyle = fref->GetUnderlined() ? kCTUnderlineStyleSingle : kCTUnderlineStyleNone ;
         wxCFRef<CFNumberRef> underlined( CFNumberCreate(NULL, kCFNumberSInt32Type, &ustyle) );
@@ -2021,7 +2184,7 @@ void wxMacCoreGraphicsContext::DoDrawText( const wxString &str, wxDouble x, wxDo
         y += CTFontGetAscent(font);
 
         CGContextSaveGState(m_cgContext);
-        CGContextTranslateCTM(m_cgContext, x, y);
+        CGContextTranslateCTM(m_cgContext, (CGFloat) x, (CGFloat) y);
         CGContextScaleCTM(m_cgContext, 1, -1);
         CGContextSetTextPosition(m_cgContext, 0, 0);
         CTLineDraw( line, m_cgContext );
@@ -2059,7 +2222,12 @@ void wxMacCoreGraphicsContext::DoDrawRotatedText(const wxString &str,
 {
     wxCHECK_RET( !m_font.IsNull(), wxT("wxMacCoreGraphicsContext::DrawText - no valid font set") );
 
-    EnsureIsValid();
+    if (!EnsureIsValid())
+        return;
+
+    if (m_composition == wxCOMPOSITION_DEST)
+        return;
+
 #if wxOSX_USE_CORE_TEXT
     if ( UMAGetSystemVersion() >= 0x1050 )
     {
@@ -2092,15 +2260,15 @@ void wxMacCoreGraphicsContext::DoDrawRotatedText(const wxString &str,
             {
                 kATSULineRotationTag ,
             };
-            ByteCount atsuSizes[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
+            ByteCount atsuSizes[WXSIZEOF(atsuTags)] =
             {
                 sizeof( Fixed ) ,
             };
-            ATSUAttributeValuePtr    atsuValues[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
+            ATSUAttributeValuePtr    atsuValues[WXSIZEOF(atsuTags)] =
             {
                 &atsuAngle ,
             };
-            status = ::ATSUSetLayoutControls(atsuLayout , sizeof(atsuTags) / sizeof(ATSUAttributeTag),
+            status = ::ATSUSetLayoutControls(atsuLayout , WXSIZEOF(atsuTags),
                                              atsuTags, atsuSizes, atsuValues );
         }
 
@@ -2109,15 +2277,15 @@ void wxMacCoreGraphicsContext::DoDrawRotatedText(const wxString &str,
             {
                 kATSUCGContextTag ,
             };
-            ByteCount atsuSizes[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
+            ByteCount atsuSizes[WXSIZEOF(atsuTags)] =
             {
                 sizeof( CGContextRef ) ,
             };
-            ATSUAttributeValuePtr    atsuValues[sizeof(atsuTags) / sizeof(ATSUAttributeTag)] =
+            ATSUAttributeValuePtr    atsuValues[WXSIZEOF(atsuTags)] =
             {
                 &m_cgContext ,
             };
-            status = ::ATSUSetLayoutControls(atsuLayout , sizeof(atsuTags) / sizeof(ATSUAttributeTag),
+            status = ::ATSUSetLayoutControls(atsuLayout , WXSIZEOF(atsuTags),
                                              atsuTags, atsuSizes, atsuValues );
         }
 
@@ -2179,7 +2347,7 @@ void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *wid
     if ( UMAGetSystemVersion() >= 0x1050 )
     {
         wxMacCoreGraphicsFontData* fref = (wxMacCoreGraphicsFontData*)m_font.GetRefData();
-        CTFontRef font = fref->GetCTFont();
+        CTFontRef font = fref->OSXGetCTFont();
 
         wxCFStringRef text(str, wxLocale::GetSystemEncoding() );
         CFStringRef keys[] = { kCTFontAttributeName  };
@@ -2189,9 +2357,13 @@ void wxMacCoreGraphicsContext::GetTextExtent( const wxString &str, wxDouble *wid
         wxCFRef<CFAttributedStringRef> attrtext( CFAttributedStringCreate(kCFAllocatorDefault, text, attributes) );
         wxCFRef<CTLineRef> line( CTLineCreateWithAttributedString(attrtext) );
 
-        CGFloat w, a, d, l;
-
-        w = CTLineGetTypographicBounds(line, &a, &d, &l) ;
+        // round the returned extent: this is probably more correct anyhow but
+        // we also need to do it to be consistent with GetPartialTextExtents()
+        // below and avoid strange situation when the last partial extent
+        // returned by it could have been greater than the full extent returned
+        // by us
+        CGFloat a, d, l;
+        int w = CTLineGetTypographicBounds(line, &a, &d, &l) + 0.5;
 
         if ( height )
             *height = a+d+l;
@@ -2273,7 +2445,7 @@ void wxMacCoreGraphicsContext::GetPartialTextExtents(const wxString& text, wxArr
 #if wxOSX_USE_CORE_TEXT
     {
         wxMacCoreGraphicsFontData* fref = (wxMacCoreGraphicsFontData*)m_font.GetRefData();
-        CTFontRef font = fref->GetCTFont();
+        CTFontRef font = fref->OSXGetCTFont();
 
         wxCFStringRef t(text, wxLocale::GetSystemEncoding() );
         CFStringRef keys[] = { kCTFontAttributeName  };
@@ -2286,7 +2458,7 @@ void wxMacCoreGraphicsContext::GetPartialTextExtents(const wxString& text, wxArr
         int chars = text.length();
         for ( int pos = 0; pos < (int)chars; pos ++ )
         {
-            widths[pos] = CTLineGetOffsetForStringIndex( line, pos+1 , NULL )+0.5;
+            widths[pos] = CTLineGetOffsetForStringIndex( line, pos+1 , NULL );
         }
 
         return;
@@ -2457,6 +2629,9 @@ public :
     // 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 native bitmap representation
     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  ) ;
 private :
@@ -2540,6 +2715,7 @@ wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContextFromNativeWindow( vo
 #if wxOSX_USE_CARBON
     return new wxMacCoreGraphicsContext(this,(WindowRef)window);
 #else
+    wxUnusedVar(window);
     return NULL;
 #endif
 }
@@ -2605,9 +2781,19 @@ wxGraphicsBitmap wxMacCoreGraphicsRenderer::CreateBitmap( const wxBitmap& bmp )
     if ( bmp.Ok() )
     {
         wxGraphicsBitmap p;
-#ifdef __WXMAC__
         p.SetRefData(new wxMacCoreGraphicsBitmapData( this , bmp.CreateCGImage(), bmp.GetDepth() == 1 ) );
-#endif
+        return p;
+    }
+    else
+        return wxNullGraphicsBitmap;
+}
+
+wxGraphicsBitmap wxMacCoreGraphicsRenderer::CreateBitmapFromNativeBitmap( void* bitmap )
+{
+    if ( bitmap != NULL )
+    {
+        wxGraphicsBitmap p;
+        p.SetRefData(new wxMacCoreGraphicsBitmapData( this , (CGImageRef) bitmap, false ));
         return p;
     }
     else