Module dev_overlay 

Renderer-drawn dev overlay (fps counter): one shared graph builder so every backend draws the identical overlay without composition impact.

Structs

DevOverlayKey

Cache key for the last-built overlay; rebuilding only on change keeps the overlay free when the text is stable.

Functions

build_dev_overlay_graph

Build the dev-overlay graph: a translucent pill with the stats text in the top-right corner, sized with fixed monospace-ish metrics so the overlay never depends on renderer text measurement.