Struct CollectionHeader 

pub struct CollectionHeader {
    pub version: (u16, u16),
    pub offsets: Vec<u32>,
}

Parsed TTC header. Carries the per-subfont byte offsets so the caller can construct a Font<'_> over &bytes[offset..].

Fields

version: (u16, u16)

(major, minor) from the TTC header. Always (1, 0) or (2, 0) in real-world fonts; we don’t enforce minor==0 strictly.

offsets: Vec<u32>

Per-subfont byte offsets within the parent file.

Implementations

impl CollectionHeader

pub fn parse(bytes: &[u8]) -> Result<Self, Error>

Try to parse a TTC header at the start of bytes. Returns Error::BadMagic if the leading 4 bytes are not 'ttcf' — callers can use that to differentiate between a TTC and a plain sfnt without an explicit container probe.

pub fn num_fonts(&self) -> u32

Number of subfonts in this collection.

pub fn font_offset(&self, index: u32) -> Option<u32>

File-relative byte offset of subfont index. Returns None if index is out of range.

Trait Implementations

impl Clone for CollectionHeader

fn clone(&self) -> CollectionHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CollectionHeader

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

Formats the value using the given formatter.