Point markers rendered invisible (alpha 0) through the legacy GeoJsonLayer/KmlLayer bridges

[jamesarich]

Summary

In 5.0.0, every point feature added through the deprecated GeoJsonLayer or KmlLayer classes renders fully transparent. The markers exist (they occupy tap targets) but are invisible.

Expected behavior

Point features render as visible markers (the default marker when unstyled), as they did in 4.x.

Observed behavior

Markers are added with alpha = 0. Two related root causes in the bridges' toModelFeature:

• GeoJsonLayer hardcodes PointStyle(color = 0, …).
• KmlLayer passes inline?.mMarkerColor?.toInt() ?: 0 — but KmlStyle.mMarkerColor is a hue (0..360), not an ARGB color, so even a styled placemark produces a value whose alpha byte is 0.

MapViewRenderer.createMarkerOptions then derives the marker's alpha from the style color's alpha channel:

markerOptions.alpha(android.graphics.Color.alpha(it.color) / 255.0f) // -> 0f

Environment details

1. Any (found via unit test + code inspection; hit in production via maps-compose 8.4.0 → maps-utils-ktx 6.2.0 → android-maps-utils 5.0.0)
2. Any
3. android-maps-utils 5.0.0 (data module, introduced by the v5 rewrite feat!: rewrite android maps utils #1658)

Steps to reproduce

val geoJson = """{"type":"Feature","geometry":{"type":"Point","coordinates":[-111.62,41.942]}}"""
val layer = GeoJsonLayer(map, JSONObject(geoJson))
layer.addLayerToMap() // marker is added but invisible

Same with any KML <Placemark><Point> through KmlLayer.

Related smaller gap noticed while debugging: the KML bridge's toLegacyStyle maps IconStyle scale/href/hotSpot but not IconStyle color, so mMarkerColor is never populated from parsed KML at all.

I have a fix ready (GeoJsonLayer encodes the legacy style's alpha into the color; KmlLayer converts the hue via Color.HSVToColor, defaulting to opaque black) with Robolectric regression tests asserting MarkerOptions.alpha == 1f — PR incoming.