新增场景截图 requestScreenshot

demo/libs/framework/framework.d.ts

@@ -348,6 +348,7 @@ declare module es {
         readonly entities: EntityList;
         readonly renderableComponents: RenderableComponentList;
         readonly entityProcessors: EntityProcessorList;
+        _screenshotRequestCallback: Function;
         readonly _sceneComponents: SceneComponent[];
         _renderers: Renderer[];
         readonly _postProcessors: PostProcessor[];
@@ -364,6 +365,7 @@ declare module es {
         update(): void;
         render(): void;
         postRender(): void;
+        requestScreenshot(callback: Function): void;
         addSceneComponent<T extends SceneComponent>(component: T): T;
         getSceneComponent<T extends SceneComponent>(type: any): T;
         getOrCreateSceneComponent<T extends SceneComponent>(type: any): T;

demo/libs/framework/framework.js

@@ -1719,6 +1719,15 @@ var es;
                     }
                 }
             }
+            if (this._screenshotRequestCallback) {
+                var tex = new egret.RenderTexture();
+                tex.drawToTexture(this, new es.Rectangle(0, 0, this.stage.stageWidth, this.stage.stageHeight));
+                this._screenshotRequestCallback(tex);
+                this._screenshotRequestCallback = null;
+            }
+        };
+        Scene.prototype.requestScreenshot = function (callback) {
+            this._screenshotRequestCallback = callback;
         };
         Scene.prototype.addSceneComponent = function (component) {
             component.scene = this;