Enum AlphPreprocessing 

pub enum AlphPreprocessing {
    None,
    LevelReduction,
    Reserved(u8),
}

Preprocessing hint (P) per RFC 9649 §2.7.1.2.

Only 0 and 1 are named in the spec; the other two 2-bit values are reserved. §2.7.1.2: “Decoders are not required to use this information in any specified way.” — i.e. this is purely informational metadata, not a refusal trigger.

Variants

None

0: No preprocessing was applied.

LevelReduction

1: Level reduction was applied prior to compression.

Reserved(u8)

2 or 3 — undefined by §2.7.1.2.

Trait Implementations

impl Clone for AlphPreprocessing

fn clone(&self) -> AlphPreprocessing

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for AlphPreprocessing

impl Debug for AlphPreprocessing

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

Formats the value using the given formatter.

impl Eq for AlphPreprocessing

impl PartialEq for AlphPreprocessing

fn eq(&self, other: &AlphPreprocessing) -> 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 AlphPreprocessing