check that the version of __sync_sub_and_fetch that returns a value is supported...

[wxWidgets.git] / src / mac / carbon / overlay.cpp

diff --git a/src/mac/carbon/overlay.cpp b/src/mac/carbon/overlay.cpp
index 0a1fb5407390cc6adb7bf703af1a783bde6790d5..c33c96e8e7ac4211324107a64fb8af5295978a8b 100644 (file)
--- a/src/mac/carbon/overlay.cpp
+++ b/src/mac/carbon/overlay.cpp
@@ -134,18 +134,27 @@ void wxOverlayImpl::Init( wxWindowDC* dc, int x , int y , int width , int height
 
 void wxOverlayImpl::BeginDrawing( wxWindowDC* dc)
 {
-    dc->SetGraphicsContext( wxGraphicsContext::CreateFromNative( m_overlayContext ) );
-    wxSize size = dc->GetSize() ;
-    dc->SetClippingRegion( 0 , 0 , size.x , size.y ) ;
+    wxDCImpl *impl = dc->GetImpl();
+    wxWindowDCImpl *win_impl = wxDynamicCast(impl,wxWindowDCImpl);
+    if (win_impl)
+    {
+        win_impl->SetGraphicsContext( wxGraphicsContext::CreateFromNative( m_overlayContext ) );
+        wxSize size = dc->GetSize() ;
+        dc->SetClippingRegion( 0 , 0 , size.x , size.y ) ;
+    }
 }
 
 void wxOverlayImpl::EndDrawing( wxWindowDC* dc)
 {
-    dc->SetGraphicsContext(NULL);
-    CGContextSynchronize( m_overlayContext );
+    wxDCImpl *impl = dc->GetImpl();
+    wxWindowDCImpl *win_impl = wxDynamicCast(impl,wxWindowDCImpl);
+    if (win_impl)
+        win_impl->SetGraphicsContext(NULL);
+        
+    CGContextFlush( m_overlayContext );
 }
 
-void wxOverlayImpl::Clear(wxWindowDC* dc)
+void wxOverlayImpl::Clear(wxWindowDC* WXUNUSED(dc))
 {
     wxASSERT_MSG( IsOk() , _("You cannot Clear an overlay that is not inited") );
     CGRect box  = CGRectMake( m_x - 1, m_y - 1 , m_width + 2 , m_height + 2 );