Struct Size

pub struct Size(Option<f32>);

Font size in pixels per em units.

Sizes in this crate are represented as a ratio of pixels to the size of the em square defined by the font. This is equivalent to the px unit in CSS (assuming a DPI scale factor of 1.0).

To retrieve metrics and outlines in font units, use the unscaled constructor on this type.

Tuple Fields

0: Option<f32>

Implementations

impl Size

pub fn new(ppem: f32) -> Self

Creates a new font size from the given value in pixels per em units.

pub fn unscaled() -> Self

Creates a new font size for generating unscaled metrics or outlines in font units.

pub fn ppem(self) -> Option<f32>

Returns the raw size in pixels per em units.

Results in None if the size is unscaled.

pub fn linear_scale(self, units_per_em: u16) -> f32

Computes a linear scale factor for this font size and the given units per em value which can be retrieved from the Metrics type or from the head table.

Returns 1.0 for an unscaled size or when units_per_em is 0.

pub(crate) fn fixed_linear_scale(self, units_per_em: u16) -> Fixed

Computes a fixed point linear scale factor that matches FreeType.

Trait Implementations

impl Clone for Size

fn clone(&self) -> Size

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Size

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

Formats the value using the given formatter.

impl From<Size> for DrawSettings<'_>

fn from(value: Size) -> Self

Converts to this type from the input type.

impl PartialEq for Size

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for Size

fn partial_cmp(&self, other: &Size) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Size

impl StructuralPartialEq for Size