mirror of
https://github.com/servo/servo.git
synced 2025-10-04 02:29:12 +01:00
962 lines
31 KiB
Rust
962 lines
31 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Computed values for font properties
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#[cfg(feature = "gecko")]
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use crate::gecko_bindings::{bindings, structs};
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use crate::parser::{Parse, ParserContext};
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use crate::values::animated::ToAnimatedValue;
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use crate::values::computed::{
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Angle, Context, Integer, Length, NonNegativeLength, NonNegativeNumber, NonNegativePercentage,
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};
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use crate::values::computed::{Number, Percentage, ToComputedValue};
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use crate::values::generics::font::{FeatureTagValue, FontSettings, VariationValue};
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use crate::values::generics::{font as generics, NonNegative};
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use crate::values::specified::font::{
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self as specified, KeywordInfo, MAX_FONT_WEIGHT, MIN_FONT_WEIGHT,
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};
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use crate::values::specified::length::{FontBaseSize, NoCalcLength};
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use crate::values::CSSFloat;
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use crate::Atom;
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use cssparser::{serialize_identifier, CssStringWriter, Parser};
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#[cfg(feature = "gecko")]
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use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
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use std::fmt::{self, Write};
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use std::hash::{Hash, Hasher};
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use style_traits::{CssWriter, ParseError, ToCss};
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pub use crate::values::computed::Length as MozScriptMinSize;
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pub use crate::values::specified::font::{FontSynthesis, MozScriptSizeMultiplier};
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pub use crate::values::specified::font::{XLang, XTextZoom};
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pub use crate::values::specified::Integer as SpecifiedInteger;
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/// A value for the font-weight property per:
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///
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/// https://drafts.csswg.org/css-fonts-4/#propdef-font-weight
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///
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/// This is effectively just a `Number`.
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#[derive(
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Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToResolvedValue,
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)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
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pub struct FontWeight(pub Number);
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impl Hash for FontWeight {
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fn hash<H: Hasher>(&self, hasher: &mut H) {
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hasher.write_u64((self.0 * 10000.).trunc() as u64);
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}
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}
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impl ToAnimatedValue for FontWeight {
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type AnimatedValue = Number;
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#[inline]
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fn to_animated_value(self) -> Self::AnimatedValue {
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self.0
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}
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#[inline]
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fn from_animated_value(animated: Self::AnimatedValue) -> Self {
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FontWeight(animated.max(MIN_FONT_WEIGHT).min(MAX_FONT_WEIGHT))
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}
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}
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#[derive(
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Animate,
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Clone,
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ComputeSquaredDistance,
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Copy,
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Debug,
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MallocSizeOf,
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PartialEq,
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ToAnimatedZero,
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ToCss,
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ToResolvedValue,
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)]
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#[cfg_attr(feature = "servo", derive(Serialize, Deserialize))]
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/// The computed value of font-size
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pub struct FontSize {
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/// The size.
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pub size: NonNegativeLength,
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/// If derived from a keyword, the keyword and additional transformations applied to it
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#[css(skip)]
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pub keyword_info: KeywordInfo,
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}
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impl FontWeight {
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/// Value for normal
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pub fn normal() -> Self {
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FontWeight(400.)
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}
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/// Value for bold
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pub fn bold() -> Self {
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FontWeight(700.)
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}
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/// Convert from an Gecko weight
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#[cfg(feature = "gecko")]
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pub fn from_gecko_weight(weight: structs::FontWeight) -> Self {
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// we allow a wider range of weights than is parseable
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// because system fonts may provide custom values
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let weight = unsafe { bindings::Gecko_FontWeight_ToFloat(weight) };
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FontWeight(weight)
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}
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/// Weither this weight is bold
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pub fn is_bold(&self) -> bool {
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self.0 > 500.
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}
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/// Return the bolder weight.
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///
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/// See the table in:
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/// https://drafts.csswg.org/css-fonts-4/#font-weight-numeric-values
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pub fn bolder(self) -> Self {
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if self.0 < 350. {
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FontWeight(400.)
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} else if self.0 < 550. {
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FontWeight(700.)
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} else {
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FontWeight(self.0.max(900.))
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}
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}
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/// Return the lighter weight.
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///
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/// See the table in:
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/// https://drafts.csswg.org/css-fonts-4/#font-weight-numeric-values
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pub fn lighter(self) -> Self {
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if self.0 < 550. {
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FontWeight(self.0.min(100.))
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} else if self.0 < 750. {
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FontWeight(400.)
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} else {
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FontWeight(700.)
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}
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}
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}
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impl FontSize {
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/// The actual computed font size.
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#[inline]
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pub fn size(&self) -> Length {
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self.size.0
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}
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#[inline]
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/// Get default value of font size.
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pub fn medium() -> Self {
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Self {
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size: NonNegative(Length::new(specified::FONT_MEDIUM_PX)),
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keyword_info: KeywordInfo::medium(),
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}
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}
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}
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impl ToAnimatedValue for FontSize {
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type AnimatedValue = Length;
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#[inline]
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fn to_animated_value(self) -> Self::AnimatedValue {
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self.size.0
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}
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#[inline]
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fn from_animated_value(animated: Self::AnimatedValue) -> Self {
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FontSize {
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size: NonNegative(animated.clamp_to_non_negative()),
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keyword_info: KeywordInfo::none(),
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}
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}
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}
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#[derive(Clone, Debug, Eq, PartialEq, ToComputedValue, ToResolvedValue)]
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#[cfg_attr(feature = "servo", derive(Hash, MallocSizeOf, Serialize, Deserialize))]
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/// Specifies a prioritized list of font family names or generic family names.
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#[repr(C)]
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pub struct FontFamily {
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/// The actual list of family names.
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pub families: FontFamilyList,
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/// Whether this font-family came from a specified system-font.
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pub is_system_font: bool,
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}
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macro_rules! static_font_family {
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($ident:ident, $family:expr) => {
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lazy_static! {
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static ref $ident: FontFamily = FontFamily {
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families: FontFamilyList {
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#[cfg(feature = "gecko")]
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list: crate::ArcSlice::from_iter_leaked(std::iter::once($family)),
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#[cfg(feature = "servo")]
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list: Box::new([$family]),
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#[cfg(feature = "gecko")]
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fallback: GenericFontFamily::None,
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},
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is_system_font: false,
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};
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}
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};
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}
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impl FontFamily {
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#[inline]
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/// Get default font family as `serif` which is a generic font-family
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pub fn serif() -> Self {
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Self::generic(GenericFontFamily::Serif).clone()
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}
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/// Returns the font family for `-moz-bullet-font`.
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#[cfg(feature = "gecko")]
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pub(crate) fn moz_bullet() -> &'static Self {
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static_font_family!(
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MOZ_BULLET,
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SingleFontFamily::FamilyName(FamilyName {
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name: atom!("-moz-bullet-font"),
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syntax: FontFamilyNameSyntax::Identifiers,
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})
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);
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&*MOZ_BULLET
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}
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/// Returns a font family for a single system font.
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#[cfg(feature = "gecko")]
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pub fn for_system_font(name: &str) -> Self {
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Self {
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families: FontFamilyList {
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list: crate::ArcSlice::from_iter(std::iter::once(SingleFontFamily::FamilyName(
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FamilyName {
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name: Atom::from(name),
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syntax: FontFamilyNameSyntax::Identifiers,
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},
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))),
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fallback: GenericFontFamily::None,
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},
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is_system_font: true,
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}
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}
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/// Returns a generic font family.
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pub fn generic(generic: GenericFontFamily) -> &'static Self {
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macro_rules! generic_font_family {
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($ident:ident, $family:ident) => {
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static_font_family!(
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$ident,
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SingleFontFamily::Generic(GenericFontFamily::$family)
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)
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};
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}
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generic_font_family!(SERIF, Serif);
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generic_font_family!(SANS_SERIF, SansSerif);
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generic_font_family!(MONOSPACE, Monospace);
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generic_font_family!(CURSIVE, Cursive);
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generic_font_family!(FANTASY, Fantasy);
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#[cfg(feature = "gecko")]
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generic_font_family!(MOZ_EMOJI, MozEmoji);
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generic_font_family!(SYSTEM_UI, SystemUi);
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match generic {
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GenericFontFamily::None => {
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debug_assert!(false, "Bogus caller!");
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&*SERIF
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},
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GenericFontFamily::Serif => &*SERIF,
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GenericFontFamily::SansSerif => &*SANS_SERIF,
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GenericFontFamily::Monospace => &*MONOSPACE,
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GenericFontFamily::Cursive => &*CURSIVE,
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GenericFontFamily::Fantasy => &*FANTASY,
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#[cfg(feature = "gecko")]
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GenericFontFamily::MozEmoji => &*MOZ_EMOJI,
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GenericFontFamily::SystemUi => &*SYSTEM_UI,
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}
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}
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}
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#[cfg(feature = "gecko")]
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impl MallocSizeOf for FontFamily {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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use malloc_size_of::MallocUnconditionalSizeOf;
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// SharedFontList objects are generally measured from the pointer stored
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// in the specified value. So only count this if the SharedFontList is
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// unshared.
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let shared_font_list = &self.families.list;
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if shared_font_list.is_unique() {
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shared_font_list.unconditional_size_of(ops)
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} else {
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0
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}
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}
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}
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impl ToCss for FontFamily {
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fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
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where
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W: fmt::Write,
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{
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let mut iter = self.families.iter();
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match iter.next() {
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Some(f) => f.to_css(dest)?,
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None => {
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#[cfg(feature = "gecko")]
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return self.families.fallback.to_css(dest);
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#[cfg(feature = "servo")]
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unreachable!();
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},
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}
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for family in iter {
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dest.write_str(", ")?;
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family.to_css(dest)?;
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}
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Ok(())
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}
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}
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/// The name of a font family of choice.
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#[derive(
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Clone, Debug, Eq, Hash, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToShmem,
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)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
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#[repr(C)]
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pub struct FamilyName {
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/// Name of the font family.
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pub name: Atom,
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/// Syntax of the font family.
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pub syntax: FontFamilyNameSyntax,
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}
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impl ToCss for FamilyName {
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fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
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where
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W: fmt::Write,
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{
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match self.syntax {
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FontFamilyNameSyntax::Quoted => {
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dest.write_char('"')?;
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write!(CssStringWriter::new(dest), "{}", self.name)?;
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dest.write_char('"')
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},
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FontFamilyNameSyntax::Identifiers => {
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let mut first = true;
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for ident in self.name.to_string().split(' ') {
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if first {
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first = false;
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} else {
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dest.write_char(' ')?;
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}
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debug_assert!(
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!ident.is_empty(),
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"Family name with leading, \
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trailing, or consecutive white spaces should \
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have been marked quoted by the parser"
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);
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serialize_identifier(ident, dest)?;
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}
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Ok(())
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},
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}
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}
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}
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#[derive(
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Clone, Copy, Debug, Eq, Hash, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToShmem,
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)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
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/// Font family names must either be given quoted as strings,
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/// or unquoted as a sequence of one or more identifiers.
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#[repr(u8)]
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pub enum FontFamilyNameSyntax {
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/// The family name was specified in a quoted form, e.g. "Font Name"
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/// or 'Font Name'.
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Quoted,
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/// The family name was specified in an unquoted form as a sequence of
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/// identifiers.
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Identifiers,
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}
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/// A set of faces that vary in weight, width or slope.
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/// cbindgen:derive-mut-casts=true
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#[derive(
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Clone, Debug, Eq, MallocSizeOf, PartialEq, ToCss, ToComputedValue, ToResolvedValue, ToShmem,
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)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize, Hash))]
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#[repr(u8)]
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pub enum SingleFontFamily {
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/// The name of a font family of choice.
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FamilyName(FamilyName),
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/// Generic family name.
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Generic(GenericFontFamily),
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}
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fn system_ui_enabled(_: &ParserContext) -> bool {
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#[cfg(feature = "gecko")]
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return static_prefs::pref!("layout.css.system-ui.enabled");
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#[cfg(feature = "servo")]
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return false;
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}
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/// A generic font-family name.
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///
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/// The order here is important, if you change it make sure that
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/// `gfxPlatformFontList.h`s ranged array and `gfxFontFamilyList`'s
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/// sSingleGenerics are updated as well.
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///
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/// NOTE(emilio): Should be u8, but it's a u32 because of ABI issues between GCC
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/// and LLVM see https://bugs.llvm.org/show_bug.cgi?id=44228 / bug 1600735 /
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/// bug 1726515.
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#[derive(
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Clone,
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Copy,
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||
Debug,
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||
Eq,
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||
Hash,
|
||
MallocSizeOf,
|
||
PartialEq,
|
||
Parse,
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||
ToCss,
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||
ToComputedValue,
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||
ToResolvedValue,
|
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ToShmem,
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)]
|
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
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#[repr(u32)]
|
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#[allow(missing_docs)]
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pub enum GenericFontFamily {
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/// No generic family specified, only for internal usage.
|
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///
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/// NOTE(emilio): Gecko code relies on this variant being zero.
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#[css(skip)]
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None = 0,
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Serif,
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SansSerif,
|
||
#[parse(aliases = "-moz-fixed")]
|
||
Monospace,
|
||
Cursive,
|
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Fantasy,
|
||
#[parse(condition = "system_ui_enabled")]
|
||
SystemUi,
|
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/// An internal value for emoji font selection.
|
||
#[css(skip)]
|
||
#[cfg(feature = "gecko")]
|
||
MozEmoji,
|
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}
|
||
|
||
impl GenericFontFamily {
|
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/// When we disallow websites to override fonts, we ignore some generic
|
||
/// families that the website might specify, since they're not configured by
|
||
/// the user. See bug 789788 and bug 1730098.
|
||
#[cfg(feature = "gecko")]
|
||
pub(crate) fn valid_for_user_font_prioritization(self) -> bool {
|
||
match self {
|
||
Self::None | Self::Fantasy | Self::Cursive | Self::SystemUi | Self::MozEmoji => false,
|
||
|
||
Self::Serif | Self::SansSerif | Self::Monospace => true,
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Parse for SingleFontFamily {
|
||
/// Parse a font-family value.
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
if let Ok(value) = input.try_parse(|i| i.expect_string_cloned()) {
|
||
return Ok(SingleFontFamily::FamilyName(FamilyName {
|
||
name: Atom::from(&*value),
|
||
syntax: FontFamilyNameSyntax::Quoted,
|
||
}));
|
||
}
|
||
|
||
if let Ok(generic) = input.try_parse(|i| GenericFontFamily::parse(context, i)) {
|
||
return Ok(SingleFontFamily::Generic(generic));
|
||
}
|
||
|
||
let first_ident = input.expect_ident_cloned()?;
|
||
let reserved = match_ignore_ascii_case! { &first_ident,
|
||
// https://drafts.csswg.org/css-fonts/#propdef-font-family
|
||
// "Font family names that happen to be the same as a keyword value
|
||
// (`inherit`, `serif`, `sans-serif`, `monospace`, `fantasy`, and `cursive`)
|
||
// must be quoted to prevent confusion with the keywords with the same names.
|
||
// The keywords ‘initial’ and ‘default’ are reserved for future use
|
||
// and must also be quoted when used as font names.
|
||
// UAs must not consider these keywords as matching the <family-name> type."
|
||
"inherit" | "initial" | "unset" | "revert" | "default" => true,
|
||
_ => false,
|
||
};
|
||
|
||
let mut value = first_ident.as_ref().to_owned();
|
||
let mut serialize_quoted = value.contains(' ');
|
||
|
||
// These keywords are not allowed by themselves.
|
||
// The only way this value can be valid with with another keyword.
|
||
if reserved {
|
||
let ident = input.expect_ident()?;
|
||
serialize_quoted = serialize_quoted || ident.contains(' ');
|
||
value.push(' ');
|
||
value.push_str(&ident);
|
||
}
|
||
while let Ok(ident) = input.try_parse(|i| i.expect_ident_cloned()) {
|
||
serialize_quoted = serialize_quoted || ident.contains(' ');
|
||
value.push(' ');
|
||
value.push_str(&ident);
|
||
}
|
||
let syntax = if serialize_quoted {
|
||
// For font family names which contains special white spaces, e.g.
|
||
// `font-family: \ a\ \ b\ \ c\ ;`, it is tricky to serialize them
|
||
// as identifiers correctly. Just mark them quoted so we don't need
|
||
// to worry about them in serialization code.
|
||
FontFamilyNameSyntax::Quoted
|
||
} else {
|
||
FontFamilyNameSyntax::Identifiers
|
||
};
|
||
Ok(SingleFontFamily::FamilyName(FamilyName {
|
||
name: Atom::from(value),
|
||
syntax,
|
||
}))
|
||
}
|
||
}
|
||
|
||
#[cfg(feature = "servo")]
|
||
impl SingleFontFamily {
|
||
/// Get the corresponding font-family with Atom
|
||
pub fn from_atom(input: Atom) -> SingleFontFamily {
|
||
match input {
|
||
atom!("serif") => return SingleFontFamily::Generic(GenericFontFamily::Serif),
|
||
atom!("sans-serif") => return SingleFontFamily::Generic(GenericFontFamily::SansSerif),
|
||
atom!("cursive") => return SingleFontFamily::Generic(GenericFontFamily::Cursive),
|
||
atom!("fantasy") => return SingleFontFamily::Generic(GenericFontFamily::Fantasy),
|
||
atom!("monospace") => return SingleFontFamily::Generic(GenericFontFamily::Monospace),
|
||
atom!("system-ui") => return SingleFontFamily::Generic(GenericFontFamily::SystemUi),
|
||
_ => {},
|
||
}
|
||
|
||
match_ignore_ascii_case! { &input,
|
||
"serif" => return SingleFontFamily::Generic(GenericFontFamily::Serif),
|
||
"sans-serif" => return SingleFontFamily::Generic(GenericFontFamily::SansSerif),
|
||
"cursive" => return SingleFontFamily::Generic(GenericFontFamily::Cursive),
|
||
"fantasy" => return SingleFontFamily::Generic(GenericFontFamily::Fantasy),
|
||
"monospace" => return SingleFontFamily::Generic(GenericFontFamily::Monospace),
|
||
"system-ui" => return SingleFontFamily::Generic(GenericFontFamily::SystemUi),
|
||
_ => {}
|
||
}
|
||
|
||
// We don't know if it's quoted or not. So we set it to
|
||
// quoted by default.
|
||
SingleFontFamily::FamilyName(FamilyName {
|
||
name: input,
|
||
syntax: FontFamilyNameSyntax::Quoted,
|
||
})
|
||
}
|
||
}
|
||
|
||
/// A list of font families.
|
||
#[cfg(feature = "gecko")]
|
||
#[derive(Clone, Debug, ToComputedValue, ToResolvedValue, ToShmem, PartialEq, Eq)]
|
||
#[repr(C)]
|
||
pub struct FontFamilyList {
|
||
/// The actual list of font families specified.
|
||
pub list: crate::ArcSlice<SingleFontFamily>,
|
||
/// A fallback font type (none, serif, or sans-serif, generally).
|
||
pub fallback: GenericFontFamily,
|
||
}
|
||
|
||
/// A list of font families.
|
||
#[cfg(feature = "servo")]
|
||
#[derive(
|
||
Clone,
|
||
Debug,
|
||
Deserialize,
|
||
Eq,
|
||
Hash,
|
||
MallocSizeOf,
|
||
PartialEq,
|
||
Serialize,
|
||
ToComputedValue,
|
||
ToResolvedValue,
|
||
ToShmem,
|
||
)]
|
||
pub struct FontFamilyList {
|
||
/// The actual list of font families specified.
|
||
pub list: Box<[SingleFontFamily]>,
|
||
}
|
||
|
||
impl FontFamilyList {
|
||
/// Return iterator of SingleFontFamily
|
||
pub fn iter(&self) -> impl Iterator<Item = &SingleFontFamily> {
|
||
self.list.iter()
|
||
}
|
||
|
||
/// Puts the fallback in the list if needed.
|
||
#[cfg(feature = "gecko")]
|
||
pub fn normalize(&mut self) {
|
||
if self.fallback == GenericFontFamily::None {
|
||
return;
|
||
}
|
||
let mut new_list = self.list.iter().cloned().collect::<Vec<_>>();
|
||
new_list.push(SingleFontFamily::Generic(self.fallback));
|
||
self.list = crate::ArcSlice::from_iter(new_list.into_iter());
|
||
}
|
||
|
||
/// If there's a generic font family on the list which is suitable for user
|
||
/// font prioritization, then move it to the front of the list. Otherwise,
|
||
/// prepend the default generic.
|
||
#[cfg(feature = "gecko")]
|
||
pub(crate) fn prioritize_first_generic_or_prepend(&mut self, generic: GenericFontFamily) {
|
||
let index_of_first_generic = self.iter().position(|f| match *f {
|
||
SingleFontFamily::Generic(f) => f.valid_for_user_font_prioritization(),
|
||
_ => false,
|
||
});
|
||
|
||
if let Some(0) = index_of_first_generic {
|
||
return; // Already first
|
||
}
|
||
|
||
let mut new_list = self.list.iter().cloned().collect::<Vec<_>>();
|
||
let element_to_prepend = match index_of_first_generic {
|
||
Some(i) => new_list.remove(i),
|
||
None => SingleFontFamily::Generic(generic),
|
||
};
|
||
|
||
new_list.insert(0, element_to_prepend);
|
||
self.list = crate::ArcSlice::from_iter(new_list.into_iter());
|
||
}
|
||
|
||
/// Returns whether we need to prioritize user fonts.
|
||
#[cfg(feature = "gecko")]
|
||
pub (crate) fn needs_user_font_prioritization(&self) -> bool {
|
||
self.iter().next().map_or(true, |f| match f {
|
||
SingleFontFamily::Generic(f) => !f.valid_for_user_font_prioritization(),
|
||
_ => true,
|
||
})
|
||
}
|
||
|
||
/// Return the generic ID if it is a single generic font
|
||
pub fn single_generic(&self) -> Option<GenericFontFamily> {
|
||
let mut iter = self.iter();
|
||
if let Some(SingleFontFamily::Generic(f)) = iter.next() {
|
||
if iter.next().is_none() {
|
||
return Some(*f);
|
||
}
|
||
}
|
||
None
|
||
}
|
||
}
|
||
|
||
/// Preserve the readability of text when font fallback occurs
|
||
pub type FontSizeAdjust = generics::GenericFontSizeAdjust<NonNegativeNumber>;
|
||
|
||
impl FontSizeAdjust {
|
||
#[inline]
|
||
/// Default value of font-size-adjust
|
||
pub fn none() -> Self {
|
||
FontSizeAdjust::None
|
||
}
|
||
}
|
||
|
||
/// Use VariantAlternatesList as computed type of FontVariantAlternates
|
||
pub type FontVariantAlternates = specified::VariantAlternatesList;
|
||
|
||
impl FontVariantAlternates {
|
||
/// Get initial value with VariantAlternatesList
|
||
#[inline]
|
||
pub fn get_initial_value() -> Self {
|
||
Self::default()
|
||
}
|
||
}
|
||
|
||
/// Use VariantEastAsian as computed type of FontVariantEastAsian
|
||
pub type FontVariantEastAsian = specified::VariantEastAsian;
|
||
|
||
/// Use VariantLigatures as computed type of FontVariantLigatures
|
||
pub type FontVariantLigatures = specified::VariantLigatures;
|
||
|
||
/// Use VariantNumeric as computed type of FontVariantNumeric
|
||
pub type FontVariantNumeric = specified::VariantNumeric;
|
||
|
||
/// Use FontSettings as computed type of FontFeatureSettings.
|
||
pub type FontFeatureSettings = FontSettings<FeatureTagValue<Integer>>;
|
||
|
||
/// The computed value for font-variation-settings.
|
||
pub type FontVariationSettings = FontSettings<VariationValue<Number>>;
|
||
|
||
/// font-language-override can only have a single three-letter
|
||
/// OpenType "language system" tag, so we should be able to compute
|
||
/// it and store it as a 32-bit integer
|
||
/// (see http://www.microsoft.com/typography/otspec/languagetags.htm).
|
||
#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, PartialEq, ToResolvedValue)]
|
||
#[repr(C)]
|
||
pub struct FontLanguageOverride(pub u32);
|
||
|
||
impl FontLanguageOverride {
|
||
#[inline]
|
||
/// Get computed default value of `font-language-override` with 0
|
||
pub fn zero() -> FontLanguageOverride {
|
||
FontLanguageOverride(0)
|
||
}
|
||
|
||
/// Returns this value as a `&str`, backed by `storage`.
|
||
#[inline]
|
||
pub(crate) fn to_str(self, storage: &mut [u8; 4]) -> &str {
|
||
*storage = u32::to_be_bytes(self.0);
|
||
// Safe because we ensure it's ASCII during computing
|
||
let slice = if cfg!(debug_assertions) {
|
||
std::str::from_utf8(&storage[..]).unwrap()
|
||
} else {
|
||
unsafe { std::str::from_utf8_unchecked(&storage[..]) }
|
||
};
|
||
slice.trim_end()
|
||
}
|
||
|
||
/// Parses a str, return `Self::zero()` if the input isn't a valid OpenType
|
||
/// "language system" tag.
|
||
#[inline]
|
||
pub fn from_str(lang: &str) -> Self {
|
||
if lang.is_empty() || lang.len() > 4 {
|
||
return Self::zero();
|
||
}
|
||
let mut bytes = [b' '; 4];
|
||
for (byte, lang_byte) in bytes.iter_mut().zip(lang.as_bytes()) {
|
||
if !lang_byte.is_ascii() {
|
||
return Self::zero();
|
||
}
|
||
*byte = *lang_byte;
|
||
}
|
||
Self(u32::from_be_bytes(bytes))
|
||
}
|
||
|
||
/// Unsafe because `Self::to_str` requires the value to represent a UTF-8
|
||
/// string.
|
||
#[inline]
|
||
pub unsafe fn from_u32(value: u32) -> Self {
|
||
Self(value)
|
||
}
|
||
}
|
||
|
||
impl ToCss for FontLanguageOverride {
|
||
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
|
||
where
|
||
W: fmt::Write,
|
||
{
|
||
if self.0 == 0 {
|
||
return dest.write_str("normal");
|
||
}
|
||
self.to_str(&mut [0; 4]).to_css(dest)
|
||
}
|
||
}
|
||
|
||
// FIXME(emilio): Make Gecko use the cbindgen'd fontLanguageOverride, then
|
||
// remove this.
|
||
#[cfg(feature = "gecko")]
|
||
impl From<u32> for FontLanguageOverride {
|
||
fn from(v: u32) -> Self {
|
||
unsafe { Self::from_u32(v) }
|
||
}
|
||
}
|
||
|
||
#[cfg(feature = "gecko")]
|
||
impl From<FontLanguageOverride> for u32 {
|
||
fn from(v: FontLanguageOverride) -> u32 {
|
||
v.0
|
||
}
|
||
}
|
||
|
||
impl ToComputedValue for specified::MozScriptMinSize {
|
||
type ComputedValue = MozScriptMinSize;
|
||
|
||
fn to_computed_value(&self, cx: &Context) -> MozScriptMinSize {
|
||
// this value is used in the computation of font-size, so
|
||
// we use the parent size
|
||
let base_size = FontBaseSize::InheritedStyle;
|
||
match self.0 {
|
||
NoCalcLength::FontRelative(value) => value.to_computed_value(cx, base_size),
|
||
NoCalcLength::ServoCharacterWidth(value) => {
|
||
value.to_computed_value(base_size.resolve(cx))
|
||
},
|
||
ref l => l.to_computed_value(cx),
|
||
}
|
||
}
|
||
|
||
fn from_computed_value(other: &MozScriptMinSize) -> Self {
|
||
specified::MozScriptMinSize(ToComputedValue::from_computed_value(other))
|
||
}
|
||
}
|
||
|
||
/// The computed value of the math-depth property.
|
||
pub type MathDepth = i8;
|
||
|
||
#[cfg(feature = "gecko")]
|
||
impl ToComputedValue for specified::MathDepth {
|
||
type ComputedValue = MathDepth;
|
||
|
||
fn to_computed_value(&self, cx: &Context) -> i8 {
|
||
use crate::properties::longhands::math_style::SpecifiedValue as MathStyleValue;
|
||
use std::{cmp, i8};
|
||
|
||
let int = match *self {
|
||
specified::MathDepth::AutoAdd => {
|
||
let parent = cx.builder.get_parent_font().clone_math_depth() as i32;
|
||
let style = cx.builder.get_parent_font().clone_math_style();
|
||
if style == MathStyleValue::Compact {
|
||
parent.saturating_add(1)
|
||
} else {
|
||
parent
|
||
}
|
||
},
|
||
specified::MathDepth::Add(rel) => {
|
||
let parent = cx.builder.get_parent_font().clone_math_depth();
|
||
(parent as i32).saturating_add(rel.to_computed_value(cx))
|
||
},
|
||
specified::MathDepth::Absolute(abs) => abs.to_computed_value(cx),
|
||
};
|
||
cmp::min(int, i8::MAX as i32) as i8
|
||
}
|
||
|
||
fn from_computed_value(other: &i8) -> Self {
|
||
let computed_value = *other as i32;
|
||
specified::MathDepth::Absolute(SpecifiedInteger::from_computed_value(&computed_value))
|
||
}
|
||
}
|
||
|
||
/// A wrapper over an `Angle`, that handles clamping to the appropriate range
|
||
/// for `font-style` animation.
|
||
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToResolvedValue)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
|
||
pub struct FontStyleAngle(pub Angle);
|
||
|
||
impl ToAnimatedValue for FontStyleAngle {
|
||
type AnimatedValue = Angle;
|
||
|
||
#[inline]
|
||
fn to_animated_value(self) -> Self::AnimatedValue {
|
||
self.0
|
||
}
|
||
|
||
#[inline]
|
||
fn from_animated_value(animated: Self::AnimatedValue) -> Self {
|
||
FontStyleAngle(Angle::from_degrees(
|
||
animated
|
||
.degrees()
|
||
.min(specified::FONT_STYLE_OBLIQUE_MAX_ANGLE_DEGREES)
|
||
.max(specified::FONT_STYLE_OBLIQUE_MIN_ANGLE_DEGREES),
|
||
))
|
||
}
|
||
}
|
||
|
||
impl Hash for FontStyleAngle {
|
||
fn hash<H: Hasher>(&self, hasher: &mut H) {
|
||
hasher.write_u64((self.0.degrees() * 10000.).trunc() as u64);
|
||
}
|
||
}
|
||
|
||
/// The computed value of `font-style`.
|
||
///
|
||
/// FIXME(emilio): Angle should be a custom type to handle clamping during
|
||
/// animation.
|
||
pub type FontStyle = generics::FontStyle<FontStyleAngle>;
|
||
|
||
impl FontStyle {
|
||
/// The `normal` value.
|
||
#[inline]
|
||
pub fn normal() -> Self {
|
||
generics::FontStyle::Normal
|
||
}
|
||
|
||
/// The default angle for font-style: oblique. This is 20deg per spec:
|
||
///
|
||
/// https://drafts.csswg.org/css-fonts-4/#valdef-font-style-oblique-angle
|
||
#[inline]
|
||
pub fn default_angle() -> FontStyleAngle {
|
||
FontStyleAngle(Angle::from_degrees(
|
||
specified::DEFAULT_FONT_STYLE_OBLIQUE_ANGLE_DEGREES,
|
||
))
|
||
}
|
||
|
||
/// Get the font style from Gecko's nsFont struct.
|
||
#[cfg(feature = "gecko")]
|
||
pub fn from_gecko(style: structs::FontSlantStyle) -> Self {
|
||
let mut angle = 0.;
|
||
let mut italic = false;
|
||
let mut normal = false;
|
||
unsafe {
|
||
bindings::Gecko_FontSlantStyle_Get(style, &mut normal, &mut italic, &mut angle);
|
||
}
|
||
if normal {
|
||
return generics::FontStyle::Normal;
|
||
}
|
||
if italic {
|
||
return generics::FontStyle::Italic;
|
||
}
|
||
generics::FontStyle::Oblique(FontStyleAngle(Angle::from_degrees(angle)))
|
||
}
|
||
}
|
||
|
||
impl ToCss for FontStyle {
|
||
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
|
||
where
|
||
W: fmt::Write,
|
||
{
|
||
match *self {
|
||
generics::FontStyle::Normal => dest.write_str("normal"),
|
||
generics::FontStyle::Italic => dest.write_str("italic"),
|
||
generics::FontStyle::Oblique(ref angle) => {
|
||
dest.write_str("oblique")?;
|
||
// Use `degrees` instead of just comparing Angle because
|
||
// `degrees` can return slightly different values due to
|
||
// floating point conversions.
|
||
if angle.0.degrees() != Self::default_angle().0.degrees() {
|
||
dest.write_char(' ')?;
|
||
angle.to_css(dest)?;
|
||
}
|
||
Ok(())
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
/// A value for the font-stretch property per:
|
||
///
|
||
/// https://drafts.csswg.org/css-fonts-4/#propdef-font-stretch
|
||
#[derive(
|
||
Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToResolvedValue,
|
||
)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
|
||
pub struct FontStretch(pub NonNegativePercentage);
|
||
|
||
impl FontStretch {
|
||
/// 100%
|
||
pub fn hundred() -> Self {
|
||
FontStretch(NonNegativePercentage::hundred())
|
||
}
|
||
|
||
/// The float value of the percentage
|
||
#[inline]
|
||
pub fn value(&self) -> CSSFloat {
|
||
((self.0).0).0
|
||
}
|
||
}
|
||
|
||
impl ToAnimatedValue for FontStretch {
|
||
type AnimatedValue = Percentage;
|
||
|
||
#[inline]
|
||
fn to_animated_value(self) -> Self::AnimatedValue {
|
||
self.0.to_animated_value()
|
||
}
|
||
|
||
#[inline]
|
||
fn from_animated_value(animated: Self::AnimatedValue) -> Self {
|
||
FontStretch(NonNegativePercentage::from_animated_value(animated))
|
||
}
|
||
}
|
||
|
||
impl Hash for FontStretch {
|
||
fn hash<H: Hasher>(&self, hasher: &mut H) {
|
||
hasher.write_u64((self.value() * 10000.).trunc() as u64);
|
||
}
|
||
}
|