Struct Lookup4 

pub struct Lookup4<'a> {
    data: FontData<'a>,
}

Segment array format. A segment mapping is performed (as with Format 2), but instead of a single lookup value for all the glyphs in the segment, each glyph in the segment gets its own separate lookup value.

Fields

data: FontData<'a>

Implementations

impl<'a> Lookup4<'a>

pub const MIN_SIZE: usize

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) -> &Self

👎Deprecated: just use the base type directly

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.

pub fn format(&self) -> u16

Format number is set to 4.

pub fn unit_size(&self) -> u16

Size of a lookup unit for this search in bytes.

pub fn n_units(&self) -> u16

Number of units of the preceding size to be searched.

pub fn search_range(&self) -> u16

The value of unitSize times the largest power of 2 that is less than or equal to the value of nUnits.

pub fn entry_selector(&self) -> u16

The log base 2 of the largest power of 2 less than or equal to the value of nUnits.

pub fn range_shift(&self) -> u16

The value of unitSize times the difference of the value of nUnits minus the largest power of 2 less than or equal to the value of nUnits.

pub fn segments(&self) -> &'a [LookupSegment4]

Segments.

pub fn format_byte_range(&self) -> Range<usize>

pub fn unit_size_byte_range(&self) -> Range<usize>

pub fn n_units_byte_range(&self) -> Range<usize>

pub fn search_range_byte_range(&self) -> Range<usize>

pub fn entry_selector_byte_range(&self) -> Range<usize>

pub fn range_shift_byte_range(&self) -> Range<usize>

pub fn segments_byte_range(&self) -> Range<usize>

impl Lookup4<'_>

pub fn value<T: LookupValue>(&self, index: u16) -> Result<T, ReadError>

pub fn segment_values<T: LookupValue>( &self, segment: usize, ) -> Result<&[BigEndian<T>], ReadError>

Trait Implementations

impl<'a> Clone for Lookup4<'a>

fn clone(&self) -> Lookup4<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> FontRead<'a> for Lookup4<'a>

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

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

impl Format<u16> for Lookup4<'_>

const FORMAT: u16 = 4

The format value for this table.

impl<'a> MinByteRange<'a> for Lookup4<'a>

fn min_byte_range(&self) -> Range<usize>

fn min_table_bytes(&self) -> &'a [u8]