Type Alias Cmap4

pub type Cmap4<'a> = TableRef<'a, Cmap4Marker>;

cmap Format 4: Segment mapping to delta values

Aliased Type

struct Cmap4<'a> { /* private fields */ }

Implementations

impl<'a> Cmap4<'a>

pub fn format(&self) -> u16

Format number is set to 4.

pub fn length(&self) -> u16

This is the length in bytes of the subtable.

pub fn language(&self) -> u16

For requirements on use of the language field, see “Use of the language field in ‘cmap’ subtables” in this document.

pub fn seg_count_x2(&self) -> u16

2 × segCount.

pub fn search_range(&self) -> u16

Maximum power of 2 less than or equal to segCount, times 2 ((2floor(log2(segCount))) * 2, where “” is an exponentiation operator)

pub fn entry_selector(&self) -> u16

Log2 of the maximum power of 2 less than or equal to numTables (log2(searchRange/2), which is equal to floor(log2(segCount)))

pub fn range_shift(&self) -> u16

segCount times 2, minus searchRange ((segCount * 2) - searchRange)

pub fn end_code(&self) -> &'a [BigEndian<u16>]

End characterCode for each segment, last=0xFFFF.

pub fn start_code(&self) -> &'a [BigEndian<u16>]

Start character code for each segment.

pub fn id_delta(&self) -> &'a [BigEndian<i16>]

Delta for all character codes in segment.

pub fn id_range_offsets(&self) -> &'a [BigEndian<u16>]

Offsets into glyphIdArray or 0

pub fn glyph_id_array(&self) -> &'a [BigEndian<u16>]

Glyph index array (arbitrary length)

impl<'a> Cmap4<'a>

pub fn map_codepoint(&self, codepoint: impl Into<u32>) -> Option<GlyphId>

Maps a codepoint to a nominal glyph identifier.

pub fn iter(&self) -> Cmap4Iter<'a>

Returns an iterator over all (codepoint, glyph identifier) pairs in the subtable.

impl<'a, T> TableRef<'a, T>

pub fn resolve_offset<O: Offset, R: FontRead<'a>>( &self, offset: O, ) -> Result<R, ReadError>

Resolve the provided offset from the start of this table.

pub fn offset_data(&self) -> FontData<'a>

Return a reference to this table’s raw data.

We use this in the compile crate to resolve offsets.

pub fn shape(&self) -> &T

Return a reference to the table’s ‘Shape’ struct.

This is a low level implementation detail, but it can be useful in some cases where you want to know things about a table’s layout, such as the byte offsets of specific fields.

Trait Implementations

impl<'a> FontRead<'a> for Cmap4<'a>

fn read(data: FontData<'a>) -> Result<Self, ReadError>

Read an instance of Self from the provided data, performing validation.

impl<'a, T: Clone> Clone for TableRef<'a, T>

fn clone(&self) -> TableRef<'a, T>

Returns a copy of the value.

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

Performs copy-assignment from source.