pub fn host_density() -> f32Expand description
How many physical pixels this host puts in one logical pixel.
One number, from wherever this platform keeps it: the activity
configuration on Android, the screen’s backing scale on macOS and iOS, the
window’s scale factor on desktop, devicePixelRatio in a browser. An
application asking “how big is a hairline here” reads this rather than the
platform API behind it.
Before the first surface exists this is 1.0 — the honest answer, since
nothing has been measured yet — so a caller that needs the real value waits
for a frame or observes
rememberHostSurfaceSize.