Enum LightLevelMethod 

#[non_exhaustive]
pub enum LightLevelMethod {
    MaxRgb,
    LuminanceBt2020,
}

Per-pixel reduction method for content-light-level measurement.

CTA-861-G Annex P pins MaxCLL as “the largest light level of any pixel” without normatively fixing the per-pixel reduction. Two readings are in production use:

• MaxRgb — max(R, G, B) in cd/m². The dominant industry convention (x265, DaVinci Resolve, Psychtoolbox, Dolby Vision L1, libultrahdr). Bounds what a panel must drive on its worst channel and is conservative on saturated colours.
• LuminanceBt2020 — BT.2020 NCL luma (0.2627·R + 0.6780·G + 0.0593·B). Used by some Netflix / Apple TV+ pipelines. Matches photometric luminance, so a saturated red reads at 0.2627 × peak instead of the full peak — closer to perceived brightness, further from panel-drive worst case.

Default is MaxRgb matching the dominant reading.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

MaxRgb

max(R, G, B) per pixel — the CTA-861.3 industry default.

LuminanceBt2020

0.2627·R + 0.6780·G + 0.0593·B per BT.2020 NCL luma weights.

Trait Implementations

impl Clone for LightLevelMethod

fn clone(&self) -> LightLevelMethod

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LightLevelMethod

impl Debug for LightLevelMethod

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

Formats the value using the given formatter.

impl Default for LightLevelMethod

fn default() -> LightLevelMethod

Returns the “default value” for a type.

impl Eq for LightLevelMethod

impl Hash for LightLevelMethod

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for LightLevelMethod

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LightLevelMethod