Struct rusttype::PositionedGlyph
[−]
[src]
pub struct PositionedGlyph<'a> { // some fields omitted }
A glyph augmented with positioning and scaling information. You can query such a glyph for information that depends on the scale and position of the glyph.
Methods
impl<'a> PositionedGlyph<'a>
fn id(&self) -> GlyphId
The glyph identifier for this glyph.
fn font(&self) -> Option<&Font<'a>>
The font to which this glyph belongs. If the glyph is a standalone glyph that owns its resources,
it no longer has a reference to the font which it was created from (using standalone()
). In which
case, None
is returned.
fn unpositioned(&self) -> &ScaledGlyph<'a>
A reference to this glyph without positioning
fn into_unpositioned(self) -> ScaledGlyph<'a>
Removes the positioning from this glyph
fn pixel_bounding_box(&self) -> Option<Rect<i32>>
The conservative pixel-boundary bounding box for this glyph. This is the smallest rectangle aligned to pixel boundaries that encloses the shape of this glyph at this position.
fn shape(&self) -> Option<Vec<Contour>>
Similar to ScaledGlyph::shape()
, but with the position of the glyph taken into account.
fn scale(&self) -> Scale
fn position(&self) -> Point<f32>
fn draw<O: FnMut(u32, u32, f32)>(&self, o: O)
Rasterises this glyph. For each pixel in the rect given by pixel_bounding_box()
, o
is called:
o(x, y, v)
where x
and y
are the coordinates of the pixel relative to the min
coordinates of the bounding box,
and v
is the analytically calculated coverage of the pixel by the shape of the glyph.
Calls to o
proceed in horizontal scanline order, similar to this pseudo-code:
let bb = glyph.pixel_bounding_box(); for y in 0..bb.height() { for x in 0..bb.width() { o(x, y, calc_coverage(&glyph, x, y)); } }
fn standalone(&self) -> PositionedGlyph<'static>
Constructs a glyph that owns its data from this glyph. This is similar to Glyph::standalone
. See
that function for more details.