Spot Light

Spotlight.as

package ui
{
	import flash.display.Bitmap;
	
	import starling.display.BlendMode;
	import starling.display.Image;
	import starling.display.Quad;
	import starling.textures.RenderTexture;
	import starling.textures.Texture;

	public class Spotlight extends Image
	{
		private var scrWidth:Number;
		private var scrHeight:Number;
		
		private var mAlpha:Number;
		private var mBuffer:RenderTexture;
		private var mOverlay:Quad;
		private var mSpot:Image;
		
		
		[Embed(source="oval.png")]
		private static var OVAL_IMG_CLS:Class;
		
		
		public function Spotlight(w:Number, h:Number)
		{
			scrWidth= w;
			scrHeight=h;
			
			mBuffer= new RenderTexture(scrWidth/2, scrHeight/2, false);
			super(mBuffer);
		}
		
	
		
		public function create(alphaVal:Number=0.7, color:uint= 0x333333):void
		{
			mAlpha= alphaVal;
			mOverlay= new Quad(scrWidth/2, scrHeight/2, color); // size is 1/4 of the screen
			
			var ovalImg:Bitmap = new OVAL_IMG_CLS();
			
			mSpot= new Image(Texture.fromBitmap(ovalImg, false));
			mSpot.pivotX= mSpot.width/2;
			mSpot.pivotY= mSpot.height/2;
			
			// Place spot and set blendMode to erase
			mSpot.x = mOverlay.width/2;
			mSpot.y = mOverlay.height/2;
			mSpot.blendMode= BlendMode.ERASE;
			
			// Draw the texture
			mBuffer.drawBundled(drawElements);
			
			this.touchable = false;
			this.scaleX = this.scaleY = 2; // Scale by 2
		}
		
		override public function dispose():void
		{
			mBuffer.dispose();
			
			mBuffer= null;
			
			mSpot.dispose();
			mSpot= null;
			
			super.dispose();
		}
		
		
		public function updateSpot(xp:Number, yp:Number, szX:Number=0, szY:Number=0):void
		{
			mSpot.x = xp/2;
			mSpot.y = yp/2;
			
			if (szX > 0) mSpot.width = szX/2;
			if (szY > 0) mSpot.height = szY/2;
			
			// Redraw
			mBuffer.clear();
			mBuffer.drawBundled(drawElements);
		}
		
	
		private function drawElements():void
		{
			mBuffer.draw(mOverlay, null, mAlpha);
			mBuffer.draw(mSpot);
		}
	}
}

Isn't it the same?
http://wiki.starling-framework.org/extensions/pixelmask