Filter canvas raycasts with Collider2D data (Unity3D)

ColliderMask.cs

using UnityEngine;
using UnityEngine.UI;

[RequireComponent (typeof (Image), typeof (Collider2D))]
public class ColliderMask : MonoBehaviour, ICanvasRaycastFilter {

	Image m_Image;
	Collider2D m_Collider;

	void Awake () {
		m_Image = GetComponent<Image> ();
		m_Collider = GetComponent<Collider2D> ();
	}

	bool ICanvasRaycastFilter.IsRaycastLocationValid (Vector2 sp, Camera eventCamera) {
		Vector3 point = Vector3.zero;
		if (RectTransformUtility.ScreenPointToWorldPointInRectangle (m_Image.rectTransform, sp, eventCamera, out point)) {
			return m_Collider.OverlapPoint (new Vector2 (point.x, point.y));
		} else {
			return false;
		}
	}
}