devicePixelRatio not supported by QQmlImageProvider

I implement my own image provider, and on iOS devices with a devicePixelRatio of 2, the images look blurry.

The sourceSize on the QML side is defined in "non-retina" dimensions. The default way of implementing QQuickImageProvider::requestImage() will return an image of that size which will appear blurry on the iPhone/iPad.

See attached example.

And no matter which kind of trick I try in QQuickImageProvider::requestImage(), I am not able to see a crisp image in my QML scene.

Is there a way of handling this properly (ideally on the C++ side)? Or is devicePixelRatio not supported by QQmlImageProvider?