Struct write_fonts::tables::cmap::Cmap4

pub struct Cmap4 {
    pub length: u16,
    pub language: u16,
    pub seg_count_x2: u16,
    pub search_range: u16,
    pub entry_selector: u16,
    pub range_shift: u16,
    pub end_code: Vec<u16>,
    pub start_code: Vec<u16>,
    pub id_delta: Vec<i16>,
    pub id_range_offsets: Vec<u16>,
    pub glyph_id_array: Vec<u16>,
}

cmap Format 4: Segment mapping to delta values

Fields

length: u16

This is the length in bytes of the subtable.

language: u16

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

seg_count_x2: u16

2 × segCount.

search_range: u16

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

entry_selector: u16

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

range_shift: u16

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

end_code: Vec<u16>

End characterCode for each segment, last=0xFFFF.

start_code: Vec<u16>

Start character code for each segment.

id_delta: Vec<i16>

Delta for all character codes in segment.

id_range_offsets: Vec<u16>

Offsets into glyphIdArray or 0

glyph_id_array: Vec<u16>

Glyph index array (arbitrary length)

Implementations

impl Cmap4

pub fn new( length: u16, language: u16, seg_count_x2: u16, search_range: u16, entry_selector: u16, range_shift: u16, end_code: Vec<u16>, start_code: Vec<u16>, id_delta: Vec<i16>, id_range_offsets: Vec<u16>, glyph_id_array: Vec<u16> ) -> Self

Construct a new Cmap4

Trait Implementations

impl Clone for Cmap4

fn clone(&self) -> Cmap4

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Cmap4

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

Formats the value using the given formatter.

impl Default for Cmap4

fn default() -> Cmap4

Returns the “default value” for a type.

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

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

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

impl FontWrite for Cmap4

fn write_into(&self, writer: &mut TableWriter)

Write our data and information about offsets into this TableWriter.

fn name(&self) -> &'static str

impl Validate for Cmap4

fn validate_impl(&self, _ctx: &mut ValidationCtx)

Validate this table.

fn validate(&self) -> Result<(), ValidationReport>

Ensure that this table is well-formed, reporting any errors.