Method pushClipRect

packages/fairygui/src/render/RenderBridge.ts:123–133

* Push a clip rectangle * 压入裁剪矩形

(rect: IRectangle)

     * 压入裁剪矩形
     */
    public pushClipRect(rect: IRectangle): void {
        if (this._clipStack.length > 0) {
            const current = this._clipStack[this._clipStack.length - 1];
            const intersected = this.intersectRects(current, rect);
            this._clipStack.push(intersected);
        } else {
            this._clipStack.push({ ...rect });
        }
        this.flushBatch();
        this._backend.setClipRect(this._clipStack[this._clipStack.length - 1]);
    }

    /**
     * Pop the current clip rectangle