How to get 'SkEncodedImageFormat' from 'SkImageGenerator'?

Question

The following is my implementation of reading a bitmap :

bool MySkia::readBitmap(std::string path, SkBitmap& dst) {
    sk_sp<SkData> data = SkData::MakeFromFileName(path.c_str());
    if (data == nullptr) {
        return false;
    }
    std::unique_ptr<SkImageGenerator> gen(SkImageGenerator::MakeFromEncoded(std::move(data)));
    gen && dst.tryAllocPixels(gen->getInfo()) &&
    gen->getPixels(gen->getInfo().makeColorSpace(nullptr), dst.getPixels(), dst.rowBytes());

    return true;
}

But I can't find any function to get 'SkEncodedImageFormat' from 'SkImageGenerator'?
It's possible?

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By the way, I know other way to get 'SkEncodedImageFormat' :

std::unique_ptr<SkCodec> codec = SkCodec::MakeFromData(skData);
codec->getEncodedFormat();