UGUI Image with polygon sprites

For anyone may interested: I've just finished Image with polygon mode. More information can be found in https://www.codeandweb.com/blog/2015/09/21/optimizing-unity-sprite-meshes

However, unity just provide support with Sprite Renderer and UGUI cannot have this feature (It only draws Quad like this)

I implement it myself to support polygon for UnityEngine.UI.Image:...

UGUI Image with polygon sprites