Double buffering in NSView

Hi

I have written an application that works well on older versions Mac OS X but a custom NSView flickers when it is drawn on Yosemite.

My drawing method looks like this:

Code:

- (void)drawRect: (NSRect) rect {
	cairo_surface_t* surface;
	cairo_surface_t* surface_alpha;
	cairo_t* cr;
	cairo_t* cr_alpha;
	NSRect allocation = [self bounds];
	
	CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];

	surface = cairo_quartz_surface_create_for_cg_context (context, 
														  (int)allocation.size.width, 
														  (int)allocation.size.height);
	cr = cairo_create (surface);
	
	surface_alpha = cairo_surface_create_similar (surface, 
												  CAIRO_CONTENT_COLOR_ALPHA, 
												  (int)allocation.size.width, 
												  (int)allocation.size.height);
	
	cr_alpha = cairo_create (surface_alpha);
	
	cairo_save (cr);
	cairo_set_source_rgba (cr, 1, 1, 1, 1);
	cairo_rectangle (cr, 0, 0, allocation.size.width, allocation.size.height);
	cairo_restore (cr);

	// Draw many objects here, it can take 250ms.
	
	cairo_set_source_surface (cr, surface_alpha, 0, 0);
	cairo_paint (cr);
 
	cairo_destroy (cr_alpha);
	cairo_surface_destroy (surface_alpha);

	cairo_destroy (cr);
	cairo_surface_destroy (surface);
}

Should I implement double buffering and how is that done in cocoa?