Struct Subtable

pub struct Subtable<'a> { /* private fields */ }

A character encoding subtable.

Implementations

impl<'a> Subtable<'a>

pub fn platform_id(&self) -> PlatformId

Returns encoding’s platform.

pub fn encoding_id(&self) -> u16

Returns encoding ID.

pub fn format(&self) -> Format

Returns encoding’s format.

pub fn is_unicode(&self) -> bool

Checks that the current encoding is Unicode compatible.

pub fn glyph_index(&self, c: u32) -> Option<GlyphId>

Maps a character to a glyph ID.

This is a low-level method and unlike Face::glyph_index it doesn’t check that the current encoding is Unicode. It simply maps a u32 codepoint number to a glyph ID.

Returns None:

• when glyph ID is 0.
• when format is MixedCoverage, since it’s not supported.
• when format is UnicodeVariationSequences. Use glyph_variation_index instead.

pub fn glyph_variation_index( &self, c: char, variation: char, ) -> Option<GlyphVariationResult>

Resolves a variation of a glyph ID from two code points.

Returns None:

• when glyph ID is 0.
• when format is not UnicodeVariationSequences.

pub fn codepoints<F: FnMut(u32)>(&self, f: F)

Calls f for all codepoints contained in this subtable.

This is a low-level method and it doesn’t check that the current encoding is Unicode. It simply calls the function f for all u32 codepoints that are present in this subtable.

Note that this may list codepoints for which glyph_index still returns None because this method finds all codepoints which were defined in this subtable. The subtable may still map them to glyph ID 0.

Returns without doing anything:

• when format is MixedCoverage, since it’s not supported.
• when format is UnicodeVariationSequences, since it’s not supported.

Trait Implementations

impl<'a> Debug for Subtable<'a>

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

Formats the value using the given formatter.