Struct Neighbors 

pub struct Neighbors {
    pub n: i32,
    pub w: i32,
    pub nw: i32,
    pub ne: i32,
    pub nn: i32,
    pub ww: i32,
    pub nee: i32,
}

Neighbor values for prediction.

Fields

n: i32

North (top) neighbor.

w: i32

West (left) neighbor.

nw: i32

Northwest (top-left) neighbor.

ne: i32

Northeast (top-right) neighbor.

nn: i32

North-north (2 pixels above) neighbor.

ww: i32

West-west (2 pixels left) neighbor.

nee: i32

Northeast-east (top-right of top-right, pixel at x+2, y-1). Used by AverageAll predictor.

Implementations

impl Neighbors

pub fn gather(channel: &Channel, x: usize, y: usize) -> Self

Gathers neighbor values from a channel, matching the JXL spec’s edge handling.

Edge clamping rules (from jxl-rs PredictionData::get_rows):

• left: x>0 ? row[x-1] : (y>0 ? top_row[0] : 0)
• top: y>0 ? top_row[x] : left
• topleft: x>0 && y>0 ? top_row[x-1] : left
• topright: x+1 < width && y>0 ? top_row[x+1] : top
• leftleft: x>1 ? row[x-2] : left
• toptop: y>1 ? toptop_row[x] : top

pub fn gather_fast( row: &[i32], prev_row: Option<&[i32]>, prev_prev_row: Option<&[i32]>, x: usize, _width: usize, ) -> Self

Gathers neighbors with explicit row pointers for speed, matching JXL spec edge handling.

Trait Implementations

impl Clone for Neighbors

fn clone(&self) -> Neighbors

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Neighbors

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

Formats the value using the given formatter.

impl Default for Neighbors

fn default() -> Neighbors

Returns the “default value” for a type.

impl Copy for Neighbors