Enum AlphCompression 

pub enum AlphCompression {
    None,
    Lossless,
    Reserved(u8),
}

Compression method (C) per RFC 9649 §2.7.1.2.

The spec enumerates 0 (no compression) and 1 (WebP lossless format). Higher values are not defined; we preserve them in Self::Reserved so callers can refuse on encounter without the parser itself imposing that policy.

Variants

None

0: No compression — the alpha bitstream is raw 8-bit values in scan order, of length width * height.

Lossless

1: Lossless — the alpha bitstream is a §3 VP8L image-stream with implicit dimensions width x height (no header).

Reserved(u8)

2 or 3 — undefined by §2.7.1.2.

Trait Implementations

impl Clone for AlphCompression

fn clone(&self) -> AlphCompression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for AlphCompression

impl Debug for AlphCompression

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

Formats the value using the given formatter.

impl Eq for AlphCompression

impl PartialEq for AlphCompression

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