Struct EquationCache 

pub struct EquationCache { /* private fields */ }

The laid-out form of an equation’s LaTeX source. It is derived data: rebuilt by EquationCache::refresh whenever the source changes, never saved, and ignored when shapes are compared. Painters read it and never lay equations out themselves, so nothing in a paint path can reach the layout engine.

An entry answers only for the source it was built from, compared in full: a hash match alone is not enough, so two sources whose hashes collide never share a layout. A source over crate::math::MAX_SOURCE_BYTES never lays out, so EquationCache::get answers for it by its length alone, with crate::math::SOURCE_TOO_LONG, and an entry built from one holds neither the source nor its hash: a painter asking every frame about a source of megabytes read from a file does no work on it.

Implementations

impl EquationCache

pub fn get(&self, src: &str) -> Option<Result<&MathList, &MathError>>

The layout of src, or why it has none; None until EquationCache::refresh has run for this source. A source over crate::math::MAX_SOURCE_BYTES is answered at once, whatever the entry holds, by its length alone.

pub fn refresh(&mut self, src: &str) -> bool

Lays src out again unless the cache already holds its layout. True when it did.

pub fn refuse(&mut self, src: &str, message: &str)

Records that src was not laid out, and why, without running the layout engine.

Trait Implementations

impl Clone for EquationCache

fn clone(&self) -> EquationCache

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EquationCache

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

Formats the value using the given formatter.

impl Default for EquationCache

fn default() -> EquationCache

Returns the “default value” for a type.

impl PartialEq for EquationCache

fn eq(&self, _: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.