title: Is android Region is always a rectangular area or it may be polygonal or curvy?
body: <p>Does Android Region (<a href="http://developer.android.com/reference/android/graphics/Region.html" rel="nofollow">android.graphics.Region</a>) always have a rectangular area or can it be polygonal or rounded (curvy)?</p>
  
  <p>Actually I have to do some <code>Region.Op.UNION</code> and <code>Region.Op.INTERSECTION</code> operation with multiple regions.
  I want to know the shape of Ultimate Output Region, does it still have a rectangular area or not?</p>