Struct FontRef 

#[repr(C)]
pub struct FontRef {
    pub parsed: *const c_void,
    pub copies: *const AtomicUsize,
    pub id: u64,
    pub run_destructor: bool,
    pub parsed_destructor: FontRefDestructorCallbackType,
}

FontRef is a reference-counted pointer to a parsed font. It holds a *const c_void that points to the actual parsed font data (typically a ParsedFont from the layout crate).

The parsed data is managed via atomic reference counting, allowing safe sharing across threads without duplicating the font data.

Fields

parsed: *const c_void

Pointer to the parsed font data (e.g., ParsedFont)

copies: *const AtomicUsize

Reference counter for memory management

id: u64

Process-unique, monotonically-assigned identity of this parsed font. Shared by shallow clones (same font), fresh for each new. Used for Eq/Ord/Hash instead of the parsed pointer so that freeing a font and reusing its heap address can’t forge identity — the same aliasing fix applied to ImageRef. (Content-level dedup still uses the separate content hash via font_ref_get_hash.)

run_destructor: bool

Whether to run the destructor on drop

parsed_destructor: FontRefDestructorCallbackType

Destructor function for the parsed data

Implementations

impl FontRef

pub fn new( parsed: *const c_void, destructor: FontRefDestructorCallbackType, ) -> Self

Create a new FontRef from parsed font data

Arguments

• parsed - Pointer to parsed font data (e.g., Arc::into_raw(Arc::new(ParsedFont)))
• destructor - Function to clean up the parsed data

pub const fn get_parsed(&self) -> *const c_void

Get a raw pointer to the parsed font data

Trait Implementations

impl Clone for FontRef

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FontRef

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

Formats the value using the given formatter.

impl Drop for FontRef

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

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

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl Eq for FontRef

impl Hash for FontRef

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 FontRef

fn cmp(&self, other: &Self) -> 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.

impl PartialEq for FontRef

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for FontRef

fn partial_cmp(&self, other: &Self) -> 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 Send for FontRef

impl Sync for FontRef