修复包围盒计算的问题

src/2d/display/Container.ts

@@ -439,41 +439,40 @@ export default class Container extends DisplayObject {
 		this._lastBoundsID = this._boundsID
 		this._bounds.clear();
 		//算自己的
-		this._calculateBounds();
-		for (let i = 0; i < this.children.length; i++) {
-			const child = this.children[i];
-			if (!child.visible || !child.renderable) {
-				continue;
-			}
-			child.calculateBounds();
-			if (child.$mask) {
-				child.$mask.calculateBounds();
-				//取交集矩形
-				if (child._bounds.x < child.$mask._bounds.x) {
-					child._bounds.x = child.$mask._bounds.x;
-				}
-				if (child._bounds.y < child.$mask._bounds.y) {
-					child._bounds.y = child.$mask._bounds.y;
-				}
-				if (child._bounds.width > child.$mask._bounds.width) {
-					child._bounds.width = child.$mask._bounds.width;
+		if(!this._calculateBounds()){
+			for (let i = 0; i < this.children.length; i++) {
+				const child = this.children[i];
+				if (!child.visible || !child.renderable) {
+					continue;
 				}
-				if (child._bounds.height > child.$mask._bounds.height) {
-					child._bounds.height = child.$mask._bounds.height;
+				child.calculateBounds();
+				if (child.$mask) {
+					child.$mask.calculateBounds();
+					//取交集矩形
+					if (child._bounds.x < child.$mask._bounds.x) {
+						child._bounds.x = child.$mask._bounds.x;
+					}
+					if (child._bounds.y < child.$mask._bounds.y) {
+						child._bounds.y = child.$mask._bounds.y;
+					}
+					if (child._bounds.width > child.$mask._bounds.width) {
+						child._bounds.width = child.$mask._bounds.width;
+					}
+					if (child._bounds.height > child.$mask._bounds.height) {
+						child._bounds.height = child.$mask._bounds.height;
+					}
+					Rectangle.createFromRects(this._bounds, child._bounds);
+				} else {
+					Rectangle.createFromRects(this._bounds, child._bounds);
 				}
-				Rectangle.createFromRects(this._bounds, child._bounds);
-			} else {
-				Rectangle.createFromRects(this._bounds, child._bounds);
 			}
 		}
-
-
 	}
 
 	/**
 	 * 加"_"的方法基本是为了自己特殊处理
 	 */
-	protected _calculateBounds() {
+	protected _calculateBounds(): boolean {
 		//子类自己重写
 		//let wp = this.worldMatrix.transformPoint(this.x, this.y);
 
@@ -496,7 +495,10 @@ export default class Container extends DisplayObject {
 			matrix.transformPoint(rect.x + rect.width, rect.y + rect.height, DisplayObject._p3);
 			matrix.transformPoint(rect.x, rect.y + rect.height, DisplayObject._p4);
 			Rectangle.createFromPoints(this._bounds, DisplayObject._p1, DisplayObject._p2, DisplayObject._p3, DisplayObject._p4);
+
+			return true;
 		}
+		return false;
 	}
 
 	/**