Enum MemoryFontTier 

pub enum MemoryFontTier {
    Primary,
    Fallback,
}

How a registered in-memory face ranks against fonts on disk.

The distinction exists because “register a font by name” means two different things. A font the caller explicitly supplied for a family is that family and must beat anything installed, exactly as CSS says. A font offered as a stand-in for a generic family - the 14 standard PDF fonts answering sans-serif, say - must not, or a Win-1252 subset would displace the system’s full Unicode faces on every desktop.

Without the second tier the choice is all-or-nothing: claim sans-serif and wreck desktop, or leave it alone and have nothing at all on a target with no fonts on disk, such as wasm.

Variants

Primary

Wins over anything on disk. The right tier for a font the caller named.

Fallback

Used only after disk resolution has had its turn. The right tier for a last-resort face standing in for a generic family.

Trait Implementations

impl Clone for MemoryFontTier

fn clone(&self) -> MemoryFontTier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MemoryFontTier

impl Debug for MemoryFontTier

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

Formats the value using the given formatter.

impl Eq for MemoryFontTier

impl PartialEq for MemoryFontTier

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MemoryFontTier