-WX_NSImage WXDLLIMPEXP_CORE wxOSXGetNSImageFromCGImage( CGImageRef image );
-CGImageRef WXDLLIMPEXP_CORE wxOSXCreateCGImageFromNSImage( WX_NSImage nsimage );
+WX_NSImage WXDLLIMPEXP_CORE wxOSXGetNSImageFromCGImage( CGImageRef image, double scale = 1.0 );
+CGImageRef WXDLLIMPEXP_CORE wxOSXCreateCGImageFromNSImage( WX_NSImage nsimage, double *scale = NULL );
+CGContextRef WXDLLIMPEXP_CORE wxOSXCreateBitmapContextFromNSImage( WX_NSImage nsimage);
+