Struct Scale26Dot6 

pub struct Scale26Dot6 {
    scale: Fixed,
    is_scaled: bool,
}

Scales font units to 26.6 fixed point, reproducing FreeType’s arithmetic.

Fields

scale: Fixed

is_scaled: bool

Implementations

impl Scale26Dot6

pub fn new(ppem: Option<f32>, units_per_em: u16) -> Self

Creates a scale for the given size in pixels per em.

None produces an unscaled outline with coordinates expressed in 26.6.

pub fn to_bits(self) -> i32

The scale factor that converts font units to scaled 26.6, in 16.16.

fn mul(&self, value: i32) -> F26Dot6

Multiplies a raw value, in font units or 26.6, by the scale factor.

The factor converts as it scales, so this serves both cases.

fn mul_point(&self, value: Point<i32>) -> Point<F26Dot6>

fn mul_point_with_delta( &self, font_units: Point<i32>, delta: Point<F26Dot6>, ) -> Point<F26Dot6>

Scales a point in font units that carries a delta, given in 26.6.

The scale factor has an i32 to 26.6 conversion built into it, so the product is shifted back down afterwards.

Trait Implementations

impl Clone for Scale26Dot6

fn clone(&self) -> Scale26Dot6

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Scale26Dot6

impl Debug for Scale26Dot6

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

Formats the value using the given formatter.

impl Scale for Scale26Dot6

const NEEDS_UNSCALED: bool = true

True if the scale keeps a parallel copy of the points in font units, which hinting needs and which sparse delta interpolation uses as its reference coordinates.

type Coord = F26Dot6

Coordinate type of the loaded outline.

type Delta = Fixed

Accumulator type for variation deltas.

fn is_scaled(&self) -> bool

True if a size was supplied. When false the outline comes back in font units, expressed in Self::Coord.

fn phantom_from_font_units(&self, value: i32) -> F26Dot6

Converts a font unit value into the representation phantom points use before they are scaled.

fn coord_to_hinting_raw(&self, value: F26Dot6) -> i32

Reinterprets an output coordinate as the integer a hinter’s font unit buffer holds.

fn scale_phantom(&self, point: Point<F26Dot6>) -> Point<F26Dot6>

Scales a phantom point that still holds font units.

fn add_phantom_delta( &self, point: Point<F26Dot6>, delta: Point<Fixed>, ) -> Point<F26Dot6>

Adds a composite glyph’s phantom point delta.

fn round_phantom(&self, point: Point<F26Dot6>) -> Point<F26Dot6>

Rounds a phantom point, which FreeType does before hinting.

fn load_empty_phantom( &self, phantom: &mut [Point<F26Dot6>; 4], deltas: Option<[Point<Fixed>; 4]>, )

Sets the phantom points of a glyph with no outline.

fn load_simple_points( &self, pass: SimplePass<'_, '_, Self>, ) -> Result<[Point<F26Dot6>; 4], Error>

Reads a simple glyph’s points, applies variation deltas, appends the phantom points and writes the scaled result.

fn transform_points(&self, points: &mut [Point<F26Dot6>], transform: &Transform)

Applies a component’s 2x2 transform to points that have already been placed.

fn component_offset( &self, offset: Point<i32>, transform: &Transform, scale_offset: bool, delta: Option<Point<Fixed>>, rounding: OffsetRounding, ) -> Point<F26Dot6>

Computes the translation for a component given as an offset.