Enum Predictor 

#[repr(u8)]
pub enum Predictor {
    Zero = 0,
    Left = 1,
    Top = 2,
    Average0 = 3,
    Select = 4,
    Gradient = 5,
    Weighted = 6,
    TopRight = 7,
    TopLeft = 8,
    LeftLeft = 9,
    Average1 = 10,
    Average2 = 11,
    Average3 = 12,
    Average4 = 13,
}

Available predictors for modular encoding.

Variants

Zero = 0

Always predicts 0.

Left = 1

Uses the left neighbor (west).

Top = 2

Uses the top neighbor (north).

Average0 = 3

Average of left and top.

Select = 4

Select between left/top based on top-left.

Gradient = 5

Gradient: left + top - topleft (clamped).

Weighted = 6

Weighted average favoring left.

TopRight = 7

Top-right neighbor.

TopLeft = 8

Top-left neighbor.

LeftLeft = 9

Left-left neighbor (2 pixels left).

Average1 = 10

Average of average and gradient.

Average2 = 11

Average of average and left.

Average3 = 12

Average of average and top.

Average4 = 13

Average of top and top-right.

Implementations

impl Predictor

pub const NUM_SIMPLE: usize = 14

Number of simple predictors (excluding weighted/variable).

pub fn all_simple() -> &'static [Predictor]

Returns all simple predictors.

pub fn predict(self, channel: &Channel, x: usize, y: usize) -> i32

Predicts the value at (x, y) using this predictor.

pub fn predict_from_neighbors(self, n: &Neighbors) -> i32

Predicts from pre-gathered neighbor values.

Trait Implementations

impl Clone for Predictor

fn clone(&self) -> Predictor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Predictor

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

Formats the value using the given formatter.

impl Default for Predictor

fn default() -> Predictor

Returns the “default value” for a type.

impl PartialEq for Predictor

fn eq(&self, other: &Predictor) -> 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 Copy for Predictor

impl Eq for Predictor

impl StructuralPartialEq for Predictor