Enum FontStyle 

pub enum FontStyle {
    Normal,
    Italic,
    Oblique(Option<f32>),
}

Visual style or “slope” of a font.

In variable fonts, this can be controlled with the ital and slnt axes for italic and oblique styles, respectively.

In CSS, this corresponds to the font-style property: https://www.w3.org/TR/css-fonts-4/#font-style-prop.

Variants

Normal

An upright or “roman” style.

Italic

Generally a slanted style, originally based on semi-cursive forms.

This often has a different structure from the normal style.

Oblique(Option<f32>)

oblique with an optional angle in degrees.

If None, the engine-specific default oblique angle is used.

Implementations

impl FontStyle

pub fn parse_css(s: &str) -> Option<FontStyle>

Parses a CSS font-style value.

Supported syntax (after trimming ASCII whitespace):

• normal → FontStyle::Normal
• italic → FontStyle::Italic
• oblique → FontStyle::Oblique(Some(14.0))
• oblique <angle> where <angle> is one of:
  • <number>deg
  • <number>grad (gradians, converted to degrees)
  • <number>rad (radians, converted to degrees)
  • <number>turn (turns, converted to degrees)

If an oblique <angle> form is present but the angle cannot be parsed, this returns Some(FontStyle::Oblique(None)).

This parser is case-sensitive.

use parlance::FontStyle;

assert_eq!(FontStyle::parse_css("normal"), Some(FontStyle::Normal));
assert_eq!(FontStyle::parse_css("italic"), Some(FontStyle::Italic));
assert_eq!(
    FontStyle::parse_css("oblique"),
    Some(FontStyle::Oblique(Some(14.0)))
);
assert_eq!(
    FontStyle::parse_css("oblique 30deg"),
    Some(FontStyle::Oblique(Some(30.0)))
);
assert_eq!(
    FontStyle::parse_css("oblique banana"),
    Some(FontStyle::Oblique(None))
);
assert_eq!(FontStyle::parse_css("banana"), None);

Trait Implementations

impl Clone for FontStyle

fn clone(&self) -> FontStyle

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FontStyle

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

Formats the value using the given formatter.

impl Default for FontStyle

fn default() -> FontStyle

Returns the “default value” for a type.

impl Display for FontStyle

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

Formats the value using the given formatter.

impl FromFontconfig for FontStyle

fn from_fontconfig(slant: i32) -> Self

Creates a new style attribute with the given value from Fontconfig.

The values are determined based on the fonts.conf documentation: https://www.freedesktop.org/software/fontconfig/fontconfig-user.html.

impl PartialEq for FontStyle

fn eq(&self, other: &FontStyle) -> 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 Copy for FontStyle

impl StructuralPartialEq for FontStyle