[Development] Rendering only items that are visible in Qt Quick

[Mitch Curtis]

I'd like to get some discussion going around this:

https://bugreports.qt.io/browse/QTBUG-67274

As I understand it, clipping (the "clip" property) doesn't prevent items that aren't visible (in the sense of being out of the viewport, not the "visible" property) from actually being rendered.

It would be useful if we had a way to do this with minimal effort from the user. I'm thinking of a e.g. a property or flag in QQuickItem that, when set, would cause the scenegraph to use the shape (could start off as just being a bounding rect) of child items to determine whether or not that item is visible with regards to its parents bounding rect. That way, any regular old item can benefit from it easily.

Does anyone else have ideas about this?

Comments about how it will never work and I should feel bad for suggesting it?

Far superior alternatives?

Please, share your thoughts! :D