title: How to make sure draw operations are pixel aligned on Mac?
body: <p>In recent iOS techtalk, I heard a suggestion about "make sure your draw operations are pixel aligned".</p>
  
  <p>Is this a valid suggestion for Mac/iOS drawing performance?</p>
  
  <p>Another question is how I can determine my code is drawing with pixel aligned?<br>
  Is there any tools or tricks can help?</p>