请帮忙看看这个demo，Texture类方法getPixels导致内存泄漏。
用的引擎版本是1.7.16beta。
package
{	
	import laya.display.Sprite;
	import laya.events.Event;
	import laya.maths.Point;
	import laya.resource.HTMLCanvas;
	import laya.resource.Texture;
	import laya.utils.Handler;
	import laya.utils.Stat;
	import laya.webgl.WebGL;
	
	public class Main
	{
		
		private var _tex:Texture;
		private var _htmlCanvas:HTMLCanvas;
		private var _colorSpr:Sprite;
		private var _colorTex:Texture;
		private var _initPixelCount:int;
		
		public function Main()
		{
			Laya.init(1024, 768, WebGL);
			Stat.show(0, 0);
			Laya.stage.bgColor = "#fff";
			
			Laya.loader.load("assets/images/color1.png", Handler.create(this, __loadImageHandler));
		}
		
		private function __loadImageHandler():void
		{
			_colorSpr = new Sprite();			
			_colorTex = Laya.loader.getRes("assets/images/color1.png");
			_colorSpr.graphics.drawTexture(_colorTex);
			_colorSpr.cacheAs = "bitmap";
			_colorSpr.pos((1024 - _colorTex.width) >> 1, (768 - _colorTex.height) >> 1);
			_colorSpr.size(_colorTex.width, _colorTex.height);
			Laya.stage.addChild(_colorSpr);
			
			_initPixelCount = getPixel(_colorTex);
			addEvent();
		}
		
		private function addEvent():void
		{
			_colorSpr.on(Event.MOUSE_MOVE, this, __moveHandler);
		}
		
		private function __moveHandler():void
		{
			var p:Point = toLocal(new Point(Laya.stage.mouseX, Laya.stage.mouseY), _colorSpr);
			var cir:Sprite = new Sprite();			
			cir.graphics.drawCircle(0, 0, 15, "#fff");
			cir.pos(p.x, p.y);
			cir.blendMode = "destination-out";
			_colorSpr.addChild(cir);
			
			_htmlCanvas = _colorSpr.drawToCanvas(_colorTex.width, _colorTex.height, _colorSpr.x, _colorSpr.y);
			_tex = new Texture(_htmlCanvas);
			/************调用该方法导致内存泄漏*************/
			var pixelCount:int = getPixel(_tex);
			/************调用该方法导致内存泄漏*************/
			
			if(pixelCount / _initPixelCount < 0.3)
			{
				trace("remove");			
				_htmlCanvas.clear();
				_htmlCanvas.destroy();
				_tex.destroy();
				
				_colorSpr.off(Event.MOUSE_MOVE, this, __moveHandler);
			}
		}
		
		private function getPixel(tex:Texture):int
		{
			var pixelCount:int = 0;
			/************getPixels内存泄漏*************/
			var arr:Array = tex.getPixels(0, 0, tex.width, tex.height);
			/************getPixels内存泄漏*************/
			for(var i:int = 0; i < arr.length; i++)
			{
				if(arr > 0)
				{
					pixelCount++;
				}
			}
			return pixelCount;
		}
		
		private function toLocal(point:Object,mc:Sprite):Point
		{	
			/*
			* 参数point可以是Point类型和DisplayObject类型
			* mc是目标对象
			*/			
			var p:Object;			
			if(point is Sprite) {
				p = new Point();
				p.x = point.x;
				p.y = point.y;
				p = localToGlobal(Sprite(point));
			}else if(point is Point) {
				p = point;
			}
			
			var pp:Point = mc.globalToLocal(Point(p));
			return pp;
		}
		
		private function localToGlobal(mc:Sprite):Point
		{	
			var p:Point = new Point();
			p.x = mc.x;
			p.y = mc.y;
			
			var pp:Point = (mc.parent as Sprite).localToGlobal(p);
			return pp;
		}
	}
}