Clipping MapView to Circle (MapLibre Android)

[EllisGlaeser]

Use Case: I want to provide a "magnifier" for when the user is selecting a coordinate on the map, or drawing a route on the map. This way they can see what is under their finger. This is a second MapView displayed on top of the main map.

Problem: This is all possible, except that I want to clip this second, smaller map view to a circle to look like a magnifier. I have tried all of the standard ways to clip a View, but none of them actually clip the map — it is still displayed as a rectangle.

Here's what I've tried:

1. Compose Modifier on AndroidView

AndroidView(
    modifier = Modifier
         .clip(CircleShape)
         .size(200.dp),
    factory = {
         GPMapLibreManager.instance.magnifierView()
    }
)

From what I've read, it seems that the compose modifier isn't actually able to modify the view's outline, although the size modifier works.

2. Provide an Outline object:

class GPMagnifierView(context: Context): MapView(context) {
    
    init {
        outlineProvider = object : ViewOutlineProvider() {
            override fun getOutline(view: View, outline: Outline) {
                // Create a circular outline
                val size = view.width.coerceAtMost(view.height)
                outline.setOval(0, 0, size, size)
            }
        }
        clipToOutline = true
    }
}

3. Add a circular background via drawable resource:
   Doing this gets me a white circle on top of the map, but the map remains a square.

init {
        this.clipToOutline = true
        setBackgroundResource(R.drawable.circle_background)

        this.renderView.apply {
            setBackgroundResource(R.drawable.circle_background)
            clipToOutline = true
        }
    }

4. Override the draw function in a MapView subclass:

override fun draw(canvas: Canvas) {
        val path = Path().apply {
            val radius = 400
            val centerX = width / 2
            val centerY = height / 2

            val left = (centerX - radius).toFloat()
            val top = (centerY - radius).toFloat()
            val right = (centerX + radius).toFloat()
            val bottom = (centerY + radius).toFloat()

            addOval(left, top, right, bottom, Path.Direction.CW)
        }
        canvas.clipPath(path)
        super.draw(canvas)
}

Am I missing something, or is this not currently possible with a MapView?
If not, is this something that could be added? It could also be applicable to something like a minimap, which could also be useful.