Struct FaceId 

pub struct FaceId(/* private fields */);

A named family’s id on a glyph — what FaceRef::Named carries and FaceTable::name reads back.

A 32-bit FNV-1a of the family name, and not an index, for one reason: a glyph’s id has to mean the same thing however its row was built. A row comes from a fresh walk, from a crate::wysiwyg::BlockCache hit cloned at a shifted offset, or from a previous map a splice kept untouched — and an index into a table that each of those three assembled differently would have the same glyph naming two faces. Derived from the name, nothing has to be remapped and a spliced map’s glyphs compare equal to a fresh build’s.

Two family names that hashed alike would draw in one face. That needs about 2¹⁶ distinct families in one document to become likely, and a document with 2¹⁶ families has a different problem.

Implementations

impl FaceId

pub fn of(name: &str) -> Self

The id a family name has. FNV-1a, written out rather than taken from DefaultHasher, because the value is compared across builds and must not depend on a hasher’s seed or version.

Trait Implementations

impl Clone for FaceId

fn clone(&self) -> FaceId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FaceId

impl Debug for FaceId

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

Formats the value using the given formatter.

impl Eq for FaceId

impl Hash for FaceId

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for FaceId

fn cmp(&self, other: &FaceId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for FaceId

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for FaceId

fn partial_cmp(&self, other: &FaceId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for FaceId