Struct MappingIndex

pub struct MappingIndex {
    codepoint_subtable: Option<u16>,
    codepoint_subtable_is_symbol: bool,
    variant_subtable: Option<u16>,
    cmap12_limits: CmapIterLimits,
}

Cacheable indices of selected mapping tables for materializing a character map.

Since Charmap carries a lifetime, it is difficult to store in a cache. This type serves as an acceleration structure that allows for construction of a character map while skipping the search for the most suitable Unicode mappings.

Fields

codepoint_subtable: Option<u16>

Index of Unicode or symbol mapping subtable.

codepoint_subtable_is_symbol: bool

True if the above is a symbol mapping.

variant_subtable: Option<u16>

Index of Unicode variation selector subtable.

cmap12_limits: CmapIterLimits

Limits for iterating a cmap format 12 subtable.

Implementations

impl MappingIndex

pub fn new(font: &FontRef<'_>) -> Self

Finds the indices of the most suitable Unicode mapping tables in the given font.

pub fn charmap<'a>(&self, font: &FontRef<'a>) -> Charmap<'a>

Creates a new character map for the given font using the tables referenced by the precomputed indices.

The font should be the same as the one used to construct this object.

Trait Implementations

impl Clone for MappingIndex

fn clone(&self) -> MappingIndex

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MappingIndex

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

Formats the value using the given formatter.

impl Default for MappingIndex

fn default() -> MappingIndex

Returns the “default value” for a type.

impl Copy for MappingIndex