Struct PyramidSession 

pub struct PyramidSession { /* private fields */ }

One canvas’s pyramid in progress.

Implementations

impl PyramidSession

pub fn new( canvas: &str, width: f64, height: f64, size: usize, ) -> Result<Self, PyramidError>

A pyramid for canvas canvas whose bounds are width × height, over size-pixel tiles.

pub fn levels(&self) -> u32

Levels above level 0 this canvas gets.

pub fn queue(&mut self, x: i32, y: i32) -> Result<(i32, i32), PyramidError>

One stored index row (x, y) of the level below: queues its parent and returns the parent’s coordinates (the host records the queued parent under them).

pub fn provide( &mut self, children: [Option<Vec<u8>>; 4], ) -> Result<(), PyramidError>

The decoded pixels of the four children Step::NeedChildren asked for, None for each one not stored.

pub fn step(&mut self) -> Step