Struct GlyfContext 

pub(crate) struct GlyfContext<'a> {
    pub(crate) font: &'a Font,
    tables: &'a (Glyf<'a>, Loca<'a>),
    gvar: Option<&'a SelectedGvar<'a>>,
    h_metrics: &'a GlyphMetricRecords<'a>,
    v_metrics: &'a GlyphMetricRecords<'a>,
    coords: &'a [F2Dot14],
    gvar_scalars: &'a [Fixed],
    h_line: (i32, i32),
    num_glyphs: u32,
    units_per_em: u16,
    has_hvar: bool,
}

The tables, location and scalars a glyf outline loads from, looked up once for a font.

Loading asks for these for every glyph, so a draw reads them from here rather than from the font’s caches each time.

Fields

font: &'a Font

tables: &'a (Glyf<'a>, Loca<'a>)

gvar: Option<&'a SelectedGvar<'a>>

h_metrics: &'a GlyphMetricRecords<'a>

v_metrics: &'a GlyphMetricRecords<'a>

coords: &'a [F2Dot14]

gvar_scalars: &'a [Fixed]

h_line: (i32, i32)

The ascender and descender that place vertical phantom points for a font with no vertical metrics.

num_glyphs: u32

units_per_em: u16

has_hvar: bool

Implementations

impl<'a> GlyfContext<'a>

pub(crate) fn new(font: &'a Font) -> Option<Self>

Returns the context for font, or None if it has no glyf table.

fn metrics( &self, records: &GlyphMetricRecords<'_>, glyph: GlyphId, ) -> (i32, i32)

Returns the bearing and advance in records for glyph.

Trait Implementations

impl<'a> Clone for GlyfContext<'a>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for GlyfContext<'a>

impl<'a> OutlineContext<'a> for GlyfContext<'a>

fn glyph(&self, glyph: GlyphId) -> Option<LocaGlyph<'a>>

Returns the glyph with the given identifier, or None if it is empty.

fn glyph_variation_data(&self, glyph: GlyphId) -> Option<GlyphVariationData<'a>>

Variation data for a glyph, or None if the font does not vary or the glyph has none.

fn has_gvar(&self) -> bool

True if the font has a gvar table, whatever any one glyph has in it.

fn phantom_point_deltas(&self, glyph: GlyphId) -> Option<[Point<Fixed>; 4]>

Variation deltas for a glyph’s four phantom points.

fn gvar_scalars(&self) -> &[Fixed]

Scalars for gvar’s shared tuples at Self::coords, as SelectedGvar::compute_scalars fills them.

fn coords(&self) -> &[F2Dot14]

Normalized variation coordinates, empty for the default instance.

fn units_per_em(&self) -> u16

Design units per em.

fn h_metrics(&self, glyph: GlyphId) -> (i32, i32)

Left side bearing and advance width, in font units.

fn v_metrics(&self, glyph: GlyphId) -> Option<(i32, i32)>

Top side bearing and vertical advance for a glyph, in font units.

fn h_line_metrics(&self) -> (i32, i32)

The ascender and descender of the line horizontal text sits on, in font units.

fn has_hvar(&self) -> bool

True if the font has an HVAR table.