Enum DynamicRangeLimit 

pub enum DynamicRangeLimit {
    Standard,
    ConstrainedHigh,
    NoLimit,
}

How much of the output’s HDR headroom an image draw may use. Mirrors CSS dynamic-range-limit.

Backends remaster image content whose measured peak exceeds the resolved limit: a hue-preserving BT.2390 roll-off maps the image’s luminance range into the limit at sample time, re-derived live when the output’s headroom changes (window moves, HDR toggles). Content that already fits renders untouched — ordinary SDR art never pays for this. See docs/COLOR_MANAGEMENT.md.

Variants

Standard

Tonemap to SDR: the image may not exceed reference white.

ConstrainedHigh

Bright but bounded: at most Self::CONSTRAINED_HIGH_HEADROOM× reference white (less when the output offers less). For grids / feeds of HDR content where full-blast highlights would be hostile. (CSS constrained-high; the exact ceiling is UA-defined there too.)

NoLimit

Use the output’s full headroom — remaster only what the panel cannot show. Default, matching the CSS initial value.

Implementations

impl DynamicRangeLimit

pub const CONSTRAINED_HIGH_HEADROOM: f32 = 2.0

The ConstrainedHigh headroom ceiling, in multiples of reference white.

pub fn resolve(self, headroom: f32) -> f32

Resolve to a luminance limit in working-space units (multiples of reference white), given the output’s available headroom (target_max / reference, 1.0 on SDR, f32::INFINITY when the output declared no maximum).

Trait Implementations

impl Clone for DynamicRangeLimit

fn clone(&self) -> DynamicRangeLimit

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DynamicRangeLimit

impl Debug for DynamicRangeLimit

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

Formats the value using the given formatter.

impl Default for DynamicRangeLimit

fn default() -> DynamicRangeLimit

Returns the “default value” for a type.

impl Eq for DynamicRangeLimit

impl PartialEq for DynamicRangeLimit

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for DynamicRangeLimit