Struct Env 

pub struct Env {
    pub refresh_hz: Option<f32>,
    pub focused: bool,
    pub system: SystemEnv,
    pub window: WindowEnv,
    pub audio: AudioEnv,
}

What the host knows about the display/window. Defaults are safe for headless drivers (tests, benches) that never set anything.

Fields

refresh_hz: Option<f32>

Display refresh rate in Hz; None when the host can’t tell.

focused: bool

Whether the window has keyboard focus.

system: SystemEnv

What the OS is set to: appearance, accent, motion, locale — and whether assistive technology is listening.

window: WindowEnv

Window chrome facts (custom chrome, maximized, native control rect).

audio: AudioEnv

The output device’s state and how many playbacks are live.

Implementations

impl Env

pub const DEFAULT_HZ: f32 = 120.0

Budget fallback when the host doesn’t report a refresh rate.

pub fn frame_budget_ms(&self) -> f32

Per-frame time budget in ms: one vsync interval at the display’s refresh rate (120 Hz when unreported).

Trait Implementations

impl Clone for Env

fn clone(&self) -> Env

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Env

impl Debug for Env

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for Env

fn default() -> Env

Returns the “default value” for a type.

impl PartialEq for Env

fn eq(&self, other: &Env) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Env