title: UIImage nonlinear resizing
body: <p>I have unicolor image and i need to resize some parts from it, with different scale. Desired result is showed at image. 
  I've looked at applying grid mesh in opengles but i could not find some sample code or more detailed tutorial. 
  I've also looked at <a href="https://code.google.com/p/imgwarp-opencv/" rel="noreferrer">imgwrap</a> but as far i can see this library requires qt framework. Any ideas, sample code or links for further read will be appreciated, thanks.<img src="https://i.stack.imgur.com/tUzeK.png" alt="enter image description here">  </p>