Struct fonts::GlyphEntry

pub struct GlyphEntry {
    value: u32,
}

GlyphEntry is a port of Gecko’s CompressedGlyph scheme for storing glyph data compactly.

In the common case (reasonable glyph advances, no offsets from the font em-box, and one glyph per character), we pack glyph advance, glyph id, and some flags into a single u32.

In the uncommon case (multiple glyphs per unicode character, large glyph index/advance, or glyph offsets), we pack the glyph count into GlyphEntry, and store the other glyph information in DetailedGlyphStore.

Fields

value: u32

Implementations

impl GlyphEntry

fn new(value: u32) -> GlyphEntry

fn initial() -> GlyphEntry

fn simple(id: GlyphId, advance: Au) -> GlyphEntry

fn complex( starts_cluster: bool, starts_ligature: bool, glyph_count: usize, ) -> GlyphEntry

fn is_initial(&self) -> bool

impl GlyphEntry

fn advance(&self) -> Au

fn id(&self) -> GlyphId

fn char_is_word_separator(&self) -> bool

True if the original character was a word separator. These include spaces (U+0020), non-breaking spaces (U+00A0), and a few other characters non-exhaustively listed in the specification. Other characters may map to the same glyphs, but this function does not take mapping into account.

See https://drafts.csswg.org/css-text/#word-separator.

fn set_char_is_word_separator(&mut self)

fn glyph_count(&self) -> u16

fn is_simple(&self) -> bool

fn has_flag(&self, flag: u32) -> bool

Trait Implementations

impl Clone for GlyphEntry

fn clone(&self) -> GlyphEntry

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for GlyphEntry

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for GlyphEntry

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl MallocSizeOf for GlyphEntry

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl PartialEq for GlyphEntry

fn eq(&self, other: &GlyphEntry) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for GlyphEntry

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for GlyphEntry

impl StructuralPartialEq for GlyphEntry