Enum EncodeMode 

pub enum EncodeMode {
    Auto,
    Binary,
    Grayscale,
    Split,
    Attached,
}

Which encoding an encoder should use for a layer.

Variants

Auto

Smallest of the applicable encodings; ties go to grayscale (section 5.7).

Binary

Binary REE. Requires every pixel to be 0x00 or 0xFF.

Grayscale

Grayscale REE.

Split

Split REE. The thresholded mask thresholds at v >= 128.

Attached

Attached split REE: the same thresholded core and overlay, with the core’s lengths parity-split and self-delta coded and the overlay’s positions implied by the core’s run boundaries.

EncodeMode::Auto never picks this one: its raw size is not a guide to its compressed size, so a caller that wants it - or the writer’s own probe

• asks for it and compares the compressed result.

Trait Implementations

impl Clone for EncodeMode

fn clone(&self) -> EncodeMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for EncodeMode

impl Debug for EncodeMode

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

Formats the value using the given formatter.

impl Default for EncodeMode

fn default() -> EncodeMode

Returns the “default value” for a type.

impl Eq for EncodeMode

impl PartialEq for EncodeMode

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EncodeMode