如何在skia中从SkPicture生成skp文件？

#include "include/core/SkCanvas.h"
#include "include/core/SkPictureRecorder.h"
#include "include/core/SkStream.h"

void saveSkPictureToSkp(const char* filePath, SkPicture* skPicture) {
    SkFILEWStream stream(filePath);
    if (!stream.isValid()) {
        // 处理文件打开失败的情况
        return;
    }

    skPicture->serialize(&stream);
}

int main() {
    // 创建SkPictureRecorder对象
    SkPictureRecorder recorder;

    // 获取SkCanvas对象
    SkCanvas* canvas = recorder.beginRecording(SkRect::MakeWH(500, 500));

    // 在canvas上进行绘制操作
    canvas->drawRect(SkRect::MakeXYWH(100, 100, 300, 300), SkPaint());

    // 结束记录，获取SkPicture对象
    SkPicture* picture = recorder.finishRecordingAsPicture();

    // 保存为skp文件
    saveSkPictureToSkp("output.skp", picture);

    // 释放资源
    picture->unref();

    return 0;
}