switching to explicit flush mode, otherwise clientdc destruction lead to contention in customrenderers in osx

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62495 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dcgraph.cpp

@@ -265,9 +265,7 @@ void wxGCDCImpl::EndPage()
 
 void wxGCDCImpl::Flush()
 {
-#ifdef __WXOSX_OR_COCOA__
-    CGContextFlush( (CGContextRef) m_graphicContext->GetNativeContext() );
-#endif
+    m_graphicContext->Flush();
 }
 
 void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )

src/osx/carbon/dcclient.cpp

@@ -181,6 +181,10 @@ wxPaintDCImpl::wxPaintDCImpl( wxDC *owner, wxWindow *window ) :
     wxPoint origin = window->GetClientAreaOrigin() ;
     m_window->GetClientSize( &m_width , &m_height);
     SetDeviceOrigin( origin.x, origin.y );
+#ifdef __WXOSX_IPHONE__
+    m_graphicContext->ResetClip();
+    m_clipping = false;
+#endif
     DoSetClippingRegion( 0 , 0 , m_width , m_height ) ;
 }
 

src/osx/carbon/graphics.cpp

@@ -2010,9 +2010,6 @@ 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