Render QML without being visible, like a background task

问题

Suppose I have a map, and a few polygons. I want to render them and take a screenshot of each one of them. If the QQuickView is visible, thats easy. But, how could I achieve this, with the QQuickView not visible, like a background task?

Any ideas?

I`m using Qt 5.12.

来源：https://stackoverflow.com/questions/59503641/render-qml-without-being-visible-like-a-background-task