新增postProcessor用于处理屏幕特效

source/src/Graphics/PostProcessing/PostProcessor.ts

@@ -0,0 +1,37 @@
+class PostProcessor {
+    public enable: boolean;
+    public effect: egret.CustomFilter;
+    public scene: Scene;
+    public shape: egret.Shape;
+
+    constructor(effect: egret.CustomFilter = null){
+        this.effect = effect;
+    }
+
+    public onAddedToScene(scene: Scene){
+        this.scene = scene;
+        this.shape = new egret.Shape();
+        scene.addChild(this.shape);
+    }
+
+    public process(source: egret.DisplayObject){
+        this.drawFullscreenQuad(source, this.effect);
+    }
+
+    protected drawFullscreenQuad(texture: egret.DisplayObject, effect: egret.CustomFilter = null){
+        this.shape.graphics.clear();
+        this.shape.graphics.beginFill(0x000000, 1);
+        this.shape.graphics.drawRect(0, 0, texture.width, texture.height);
+        this.shape.graphics.endFill();
+        this.shape.filters = [effect];
+    }
+
+    public unload(){
+        if (this.effect){
+            this.effect = null;
+        }
+
+        this.scene = null;
+        this.scene.removeChild(this.shape);
+    }
+}