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1. Quartz anti-aliasing

   - (void)drawRect:(NSRect)dirtyRect {
   
       NSGraphicsContext *context = [NSGraphicsContext currentContext];
   
       [context saveGraphicsState];
   
       [context setShouldAntialias:NO];
   
       // draw here
   
       [context restoreGraphicsState];
   
       [super drawRect:dirtyRect];
   }