mirror of
https://github.com/servo/servo.git
synced 2025-10-03 18:19:14 +01:00
1289 lines
42 KiB
Rust
1289 lines
42 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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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, Number, Percentage,
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ToComputedValue,
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};
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use crate::values::generics::font::{
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FeatureTagValue, FontSettings, TaggedFontValue, VariationValue,
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};
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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::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 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::FontPalette;
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pub use crate::values::specified::font::{FontSynthesis, MozScriptSizeMultiplier};
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pub use crate::values::specified::font::{
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FontVariantAlternates, FontVariantEastAsian, FontVariantLigatures, FontVariantNumeric, XLang,
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XTextZoom,
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};
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pub use crate::values::specified::Integer as SpecifiedInteger;
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pub use crate::values::specified::Number as SpecifiedNumber;
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/// Generic template for font property type classes that use a fixed-point
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/// internal representation with `FRACTION_BITS` for the fractional part.
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///
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/// Values are constructed from and exposed as floating-point, but stored
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/// internally as fixed point, so there will be a quantization effect on
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/// fractional values, depending on the number of fractional bits used.
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///
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/// Using (16-bit) fixed-point types rather than floats for these style
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/// attributes reduces the memory footprint of gfxFontEntry and gfxFontStyle; it
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/// will also tend to reduce the number of distinct font instances that get
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/// created, particularly when styles are animated or set to arbitrary values
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/// (e.g. by sliders in the UI), which should reduce pressure on graphics
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/// resources and improve cache hit rates.
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///
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/// cbindgen:derive-lt
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/// cbindgen:derive-lte
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/// cbindgen:derive-gt
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/// cbindgen:derive-gte
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#[repr(C)]
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#[derive(
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Clone,
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ComputeSquaredDistance,
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Copy,
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Debug,
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Eq,
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Hash,
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MallocSizeOf,
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PartialEq,
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PartialOrd,
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ToResolvedValue,
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)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
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pub struct FixedPoint<T, const FRACTION_BITS: u16> {
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value: T,
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}
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impl<T, const FRACTION_BITS: u16> FixedPoint<T, FRACTION_BITS>
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where
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T: num_traits::cast::AsPrimitive<f32>,
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f32: num_traits::cast::AsPrimitive<T>,
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{
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const SCALE: u16 = 1 << FRACTION_BITS;
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const INVERSE_SCALE: f32 = 1.0 / Self::SCALE as f32;
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/// Returns a fixed-point bit from a floating-point context.
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fn from_float(v: f32) -> Self {
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use num_traits::cast::AsPrimitive;
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Self {
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value: (v * Self::SCALE as f32).round().as_(),
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}
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}
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/// Returns the floating-point representation.
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fn to_float(&self) -> f32 {
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self.value.as_() * Self::INVERSE_SCALE
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}
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}
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/// font-weight: range 1..1000, fractional values permitted; keywords
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/// 'normal', 'bold' aliased to 400, 700 respectively.
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///
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/// We use an unsigned 10.6 fixed-point value (range 0.0 - 1023.984375)
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pub const FONT_WEIGHT_FRACTION_BITS: u16 = 6;
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/// This is an alias which is useful mostly as a cbindgen / C++ inference
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/// workaround.
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pub type FontWeightFixedPoint = FixedPoint<u16, FONT_WEIGHT_FRACTION_BITS>;
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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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/// cbindgen:derive-lt
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/// cbindgen:derive-lte
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/// cbindgen:derive-gt
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/// cbindgen:derive-gte
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#[derive(
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Clone,
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ComputeSquaredDistance,
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Copy,
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Debug,
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Hash,
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MallocSizeOf,
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PartialEq,
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PartialOrd,
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ToResolvedValue,
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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 FontWeight(FontWeightFixedPoint);
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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.value()
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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::from_float(animated)
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}
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}
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impl ToCss for FontWeight {
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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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self.value().to_css(dest)
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}
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}
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impl FontWeight {
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/// The `normal` keyword.
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pub const NORMAL: FontWeight = FontWeight(FontWeightFixedPoint {
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value: 400 << FONT_WEIGHT_FRACTION_BITS,
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});
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/// The `bold` value.
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pub const BOLD: FontWeight = FontWeight(FontWeightFixedPoint {
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value: 700 << FONT_WEIGHT_FRACTION_BITS,
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});
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/// The threshold from which we consider a font bold.
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pub const BOLD_THRESHOLD: FontWeight = FontWeight(FontWeightFixedPoint {
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value: 600 << FONT_WEIGHT_FRACTION_BITS,
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});
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/// Returns the `normal` keyword value.
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pub fn normal() -> Self {
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Self::NORMAL
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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 >= Self::BOLD_THRESHOLD
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}
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/// Returns the value as a float.
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pub fn value(&self) -> f32 {
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self.0.to_float()
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}
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/// Construct a valid weight from a float value.
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pub fn from_float(v: f32) -> Self {
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Self(FixedPoint::from_float(
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v.max(MIN_FONT_WEIGHT).min(MAX_FONT_WEIGHT),
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))
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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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let value = self.value();
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if value < 350. {
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return Self::NORMAL;
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}
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if value < 550. {
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return Self::BOLD;
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}
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Self::from_float(value.max(900.))
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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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let value = self.value();
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if value < 550. {
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return Self::from_float(value.min(100.));
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}
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if value < 750. {
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return Self::NORMAL;
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}
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Self::BOLD
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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 computed size, that we use to compute ems etc. This accounts for
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/// e.g., text-zoom.
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pub computed_size: NonNegativeLength,
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/// The actual used size. This is the computed font size, potentially
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/// constrained by other factors like minimum font-size settings and so on.
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#[css(skip)]
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pub used_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 FontSize {
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/// The actual computed font size.
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#[inline]
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pub fn computed_size(&self) -> Length {
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self.computed_size.0
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}
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/// The actual used font size.
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#[inline]
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pub fn used_size(&self) -> Length {
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self.used_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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computed_size: NonNegative(Length::new(specified::FONT_MEDIUM_PX)),
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used_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.computed_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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computed_size: NonNegative(animated.clamp_to_non_negative()),
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used_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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/// Whether this is the initial font-family that might react to language
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/// changes.
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pub is_initial: 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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},
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is_system_font: false,
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is_initial: 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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},
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is_system_font: true,
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is_initial: false,
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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 return Ok(());
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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)?;
|
||
}
|
||
Ok(())
|
||
}
|
||
}
|
||
|
||
/// The name of a font family of choice.
|
||
#[derive(
|
||
Clone, Debug, Eq, Hash, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToShmem,
|
||
)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
|
||
#[repr(C)]
|
||
pub struct FamilyName {
|
||
/// Name of the font family.
|
||
pub name: Atom,
|
||
/// Syntax of the font family.
|
||
pub syntax: FontFamilyNameSyntax,
|
||
}
|
||
|
||
#[cfg(feature = "gecko")]
|
||
impl FamilyName {
|
||
fn is_known_icon_font_family(&self) -> bool {
|
||
use crate::gecko_bindings::bindings;
|
||
unsafe { bindings::Gecko_IsKnownIconFontFamily(self.name.as_ptr()) }
|
||
}
|
||
}
|
||
|
||
impl ToCss for FamilyName {
|
||
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
|
||
where
|
||
W: fmt::Write,
|
||
{
|
||
match self.syntax {
|
||
FontFamilyNameSyntax::Quoted => {
|
||
dest.write_char('"')?;
|
||
write!(CssStringWriter::new(dest), "{}", self.name)?;
|
||
dest.write_char('"')
|
||
},
|
||
FontFamilyNameSyntax::Identifiers => {
|
||
let mut first = true;
|
||
for ident in self.name.to_string().split(' ') {
|
||
if first {
|
||
first = false;
|
||
} else {
|
||
dest.write_char(' ')?;
|
||
}
|
||
debug_assert!(
|
||
!ident.is_empty(),
|
||
"Family name with leading, \
|
||
trailing, or consecutive white spaces should \
|
||
have been marked quoted by the parser"
|
||
);
|
||
serialize_identifier(ident, dest)?;
|
||
}
|
||
Ok(())
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
#[derive(
|
||
Clone, Copy, Debug, Eq, Hash, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToShmem,
|
||
)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
|
||
/// Font family names must either be given quoted as strings,
|
||
/// or unquoted as a sequence of one or more identifiers.
|
||
#[repr(u8)]
|
||
pub enum FontFamilyNameSyntax {
|
||
/// The family name was specified in a quoted form, e.g. "Font Name"
|
||
/// or 'Font Name'.
|
||
Quoted,
|
||
|
||
/// The family name was specified in an unquoted form as a sequence of
|
||
/// identifiers.
|
||
Identifiers,
|
||
}
|
||
|
||
/// A set of faces that vary in weight, width or slope.
|
||
/// cbindgen:derive-mut-casts=true
|
||
#[derive(
|
||
Clone, Debug, Eq, MallocSizeOf, PartialEq, ToCss, ToComputedValue, ToResolvedValue, ToShmem,
|
||
)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize, Hash))]
|
||
#[repr(u8)]
|
||
pub enum SingleFontFamily {
|
||
/// The name of a font family of choice.
|
||
FamilyName(FamilyName),
|
||
/// Generic family name.
|
||
Generic(GenericFontFamily),
|
||
}
|
||
|
||
fn system_ui_enabled(_: &ParserContext) -> bool {
|
||
#[cfg(feature = "gecko")]
|
||
return static_prefs::pref!("layout.css.system-ui.enabled");
|
||
#[cfg(feature = "servo")]
|
||
return false;
|
||
}
|
||
|
||
/// A generic font-family name.
|
||
///
|
||
/// The order here is important, if you change it make sure that
|
||
/// `gfxPlatformFontList.h`s ranged array and `gfxFontFamilyList`'s
|
||
/// sSingleGenerics are updated as well.
|
||
///
|
||
/// NOTE(emilio): Should be u8, but it's a u32 because of ABI issues between GCC
|
||
/// and LLVM see https://bugs.llvm.org/show_bug.cgi?id=44228 / bug 1600735 /
|
||
/// bug 1726515.
|
||
#[derive(
|
||
Clone,
|
||
Copy,
|
||
Debug,
|
||
Eq,
|
||
Hash,
|
||
MallocSizeOf,
|
||
PartialEq,
|
||
Parse,
|
||
ToCss,
|
||
ToComputedValue,
|
||
ToResolvedValue,
|
||
ToShmem,
|
||
)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
|
||
#[repr(u32)]
|
||
#[allow(missing_docs)]
|
||
pub enum GenericFontFamily {
|
||
/// No generic family specified, only for internal usage.
|
||
///
|
||
/// NOTE(emilio): Gecko code relies on this variant being zero.
|
||
#[css(skip)]
|
||
None = 0,
|
||
Serif,
|
||
SansSerif,
|
||
#[parse(aliases = "-moz-fixed")]
|
||
Monospace,
|
||
Cursive,
|
||
Fantasy,
|
||
#[parse(condition = "system_ui_enabled")]
|
||
SystemUi,
|
||
/// An internal value for emoji font selection.
|
||
#[css(skip)]
|
||
#[cfg(feature = "gecko")]
|
||
MozEmoji,
|
||
}
|
||
|
||
impl GenericFontFamily {
|
||
/// 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 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()
|
||
}
|
||
|
||
/// If there's a generic font family on the list which is suitable for user
|
||
/// font prioritization, then move it ahead of the other families in the list,
|
||
/// except for any families known to be ligature-based icon fonts, where using a
|
||
/// generic instead of the site's specified font may cause substantial breakage.
|
||
/// If no suitable generic is found in the list, insert the default generic ahead
|
||
/// of all the listed families except for known ligature-based icon fonts.
|
||
#[cfg(feature = "gecko")]
|
||
pub(crate) fn prioritize_first_generic_or_prepend(&mut self, generic: GenericFontFamily) {
|
||
let mut index_of_first_generic = None;
|
||
let mut target_index = None;
|
||
|
||
for (i, f) in self.iter().enumerate() {
|
||
match &*f {
|
||
SingleFontFamily::Generic(f) => {
|
||
if index_of_first_generic.is_none() && f.valid_for_user_font_prioritization() {
|
||
// If we haven't found a target position, there's nothing to do;
|
||
// this entry is already ahead of everything except any whitelisted
|
||
// icon fonts.
|
||
if target_index.is_none() {
|
||
return;
|
||
}
|
||
index_of_first_generic = Some(i);
|
||
break;
|
||
}
|
||
// A non-prioritized generic (e.g. cursive, fantasy) becomes the target
|
||
// position for prioritization, just like arbitrary named families.
|
||
if target_index.is_none() {
|
||
target_index = Some(i);
|
||
}
|
||
},
|
||
SingleFontFamily::FamilyName(fam) => {
|
||
// Target position for the first generic is in front of the first
|
||
// non-whitelisted icon font family we find.
|
||
if target_index.is_none() && !fam.is_known_icon_font_family() {
|
||
target_index = Some(i);
|
||
}
|
||
},
|
||
}
|
||
}
|
||
|
||
let mut new_list = self.list.iter().cloned().collect::<Vec<_>>();
|
||
let first_generic = match index_of_first_generic {
|
||
Some(i) => new_list.remove(i),
|
||
None => SingleFontFamily::Generic(generic),
|
||
};
|
||
|
||
if let Some(i) = target_index {
|
||
new_list.insert(i, first_generic);
|
||
} else {
|
||
new_list.push(first_generic);
|
||
}
|
||
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 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>>;
|
||
|
||
// The computed value of font-{feature,variation}-settings discards values
|
||
// with duplicate tags, keeping only the last occurrence of each tag.
|
||
fn dedup_font_settings<T>(settings_list: &mut Vec<T>)
|
||
where
|
||
T: TaggedFontValue,
|
||
{
|
||
if settings_list.len() > 1 {
|
||
settings_list.sort_by_key(|k| k.tag().0);
|
||
// dedup() keeps the first of any duplicates, but we want the last,
|
||
// so we implement it manually here.
|
||
let mut prev_tag = settings_list.last().unwrap().tag();
|
||
for i in (0..settings_list.len() - 1).rev() {
|
||
let cur_tag = settings_list[i].tag();
|
||
if cur_tag == prev_tag {
|
||
settings_list.remove(i);
|
||
}
|
||
prev_tag = cur_tag;
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<T> ToComputedValue for FontSettings<T>
|
||
where
|
||
T: ToComputedValue,
|
||
<T as ToComputedValue>::ComputedValue: TaggedFontValue,
|
||
{
|
||
type ComputedValue = FontSettings<T::ComputedValue>;
|
||
|
||
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
|
||
let mut v = self
|
||
.0
|
||
.iter()
|
||
.map(|item| item.to_computed_value(context))
|
||
.collect::<Vec<_>>();
|
||
dedup_font_settings(&mut v);
|
||
FontSettings(v.into_boxed_slice())
|
||
}
|
||
|
||
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
|
||
Self(
|
||
computed
|
||
.0
|
||
.iter()
|
||
.map(T::from_computed_value)
|
||
.collect::<Vec<_>>()
|
||
.into_boxed_slice(),
|
||
)
|
||
}
|
||
}
|
||
|
||
/// 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).computed_size())
|
||
},
|
||
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))
|
||
}
|
||
}
|
||
|
||
/// - Use a signed 8.8 fixed-point value (representable range -128.0..128)
|
||
///
|
||
/// Values of <angle> below -90 or above 90 not permitted, so we use out of
|
||
/// range values to represent normal | oblique
|
||
pub const FONT_STYLE_FRACTION_BITS: u16 = 8;
|
||
|
||
/// This is an alias which is useful mostly as a cbindgen / C++ inference
|
||
/// workaround.
|
||
pub type FontStyleFixedPoint = FixedPoint<i16, FONT_STYLE_FRACTION_BITS>;
|
||
|
||
/// The computed value of `font-style`.
|
||
///
|
||
/// - Define out of range values min value (-128.0) as meaning 'normal'
|
||
/// - Define max value (127.99609375) as 'italic'
|
||
/// - Other values represent 'oblique <angle>'
|
||
/// - Note that 'oblique 0deg' is distinct from 'normal' (should it be?)
|
||
///
|
||
/// cbindgen:derive-lt
|
||
/// cbindgen:derive-lte
|
||
/// cbindgen:derive-gt
|
||
/// cbindgen:derive-gte
|
||
#[derive(
|
||
Clone,
|
||
ComputeSquaredDistance,
|
||
Copy,
|
||
Debug,
|
||
Eq,
|
||
Hash,
|
||
MallocSizeOf,
|
||
PartialEq,
|
||
PartialOrd,
|
||
ToResolvedValue,
|
||
)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
|
||
#[repr(C)]
|
||
pub struct FontStyle(FontStyleFixedPoint);
|
||
|
||
impl FontStyle {
|
||
/// The normal keyword.
|
||
pub const NORMAL: FontStyle = FontStyle(FontStyleFixedPoint {
|
||
value: 100 << FONT_STYLE_FRACTION_BITS,
|
||
});
|
||
/// The italic keyword.
|
||
pub const ITALIC: FontStyle = FontStyle(FontStyleFixedPoint {
|
||
value: 101 << FONT_STYLE_FRACTION_BITS,
|
||
});
|
||
|
||
/// The default angle for `font-style: oblique`.
|
||
/// See also https://github.com/w3c/csswg-drafts/issues/2295
|
||
pub const DEFAULT_OBLIQUE_DEGREES: i16 = 14;
|
||
|
||
/// The `oblique` keyword with the default degrees.
|
||
pub const OBLIQUE: FontStyle = FontStyle(FontStyleFixedPoint {
|
||
value: Self::DEFAULT_OBLIQUE_DEGREES << FONT_STYLE_FRACTION_BITS,
|
||
});
|
||
|
||
/// The `normal` value.
|
||
#[inline]
|
||
pub fn normal() -> Self {
|
||
Self::NORMAL
|
||
}
|
||
|
||
/// Returns the oblique angle for this style.
|
||
pub fn oblique(degrees: f32) -> Self {
|
||
Self(FixedPoint::from_float(
|
||
degrees
|
||
.max(specified::FONT_STYLE_OBLIQUE_MIN_ANGLE_DEGREES)
|
||
.min(specified::FONT_STYLE_OBLIQUE_MAX_ANGLE_DEGREES),
|
||
))
|
||
}
|
||
|
||
/// Returns the oblique angle for this style.
|
||
pub fn oblique_degrees(&self) -> f32 {
|
||
debug_assert_ne!(*self, Self::NORMAL);
|
||
debug_assert_ne!(*self, Self::ITALIC);
|
||
self.0.to_float()
|
||
}
|
||
}
|
||
|
||
impl ToCss for FontStyle {
|
||
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
|
||
where
|
||
W: fmt::Write,
|
||
{
|
||
if *self == Self::NORMAL {
|
||
return dest.write_str("normal");
|
||
}
|
||
if *self == Self::ITALIC {
|
||
return dest.write_str("italic");
|
||
}
|
||
if *self == Self::OBLIQUE {
|
||
return dest.write_str("oblique");
|
||
}
|
||
dest.write_str("oblique ")?;
|
||
let angle = Angle::from_degrees(self.oblique_degrees());
|
||
angle.to_css(dest)?;
|
||
Ok(())
|
||
}
|
||
}
|
||
|
||
impl ToAnimatedValue for FontStyle {
|
||
type AnimatedValue = generics::FontStyle<Angle>;
|
||
|
||
#[inline]
|
||
fn to_animated_value(self) -> Self::AnimatedValue {
|
||
if self == Self::NORMAL {
|
||
// This allows us to animate between normal and oblique values. Per spec,
|
||
// https://drafts.csswg.org/css-fonts-4/#font-style-prop:
|
||
// Animation type: by computed value type; 'normal' animates as 'oblique 0deg'
|
||
return generics::FontStyle::Oblique(Angle::from_degrees(0.0));
|
||
}
|
||
if self == Self::ITALIC {
|
||
return generics::FontStyle::Italic;
|
||
}
|
||
generics::FontStyle::Oblique(Angle::from_degrees(self.oblique_degrees()))
|
||
}
|
||
|
||
#[inline]
|
||
fn from_animated_value(animated: Self::AnimatedValue) -> Self {
|
||
match animated {
|
||
generics::FontStyle::Normal => Self::NORMAL,
|
||
generics::FontStyle::Italic => Self::ITALIC,
|
||
generics::FontStyle::Oblique(ref angle) => {
|
||
if angle.degrees() == 0.0 {
|
||
// Reverse the conversion done in to_animated_value()
|
||
Self::NORMAL
|
||
} else {
|
||
Self::oblique(angle.degrees())
|
||
}
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
/// font-stretch is a percentage relative to normal.
|
||
///
|
||
/// We use an unsigned 10.6 fixed-point value (range 0.0 - 1023.984375)
|
||
///
|
||
/// We arbitrarily limit here to 1000%. (If that becomes a problem, we could
|
||
/// reduce the number of fractional bits and increase the limit.)
|
||
pub const FONT_STRETCH_FRACTION_BITS: u16 = 6;
|
||
|
||
/// This is an alias which is useful mostly as a cbindgen / C++ inference
|
||
/// workaround.
|
||
pub type FontStretchFixedPoint = FixedPoint<u16, FONT_STRETCH_FRACTION_BITS>;
|
||
|
||
/// A value for the font-stretch property per:
|
||
///
|
||
/// https://drafts.csswg.org/css-fonts-4/#propdef-font-stretch
|
||
///
|
||
/// cbindgen:derive-lt
|
||
/// cbindgen:derive-lte
|
||
/// cbindgen:derive-gt
|
||
/// cbindgen:derive-gte
|
||
#[derive(
|
||
Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf, PartialEq, PartialOrd, ToResolvedValue,
|
||
)]
|
||
#[cfg_attr(feature = "servo", derive(Deserialize, Hash, Serialize))]
|
||
#[repr(C)]
|
||
pub struct FontStretch(pub FontStretchFixedPoint);
|
||
|
||
impl FontStretch {
|
||
/// The fraction bits, as an easy-to-access-constant.
|
||
pub const FRACTION_BITS: u16 = FONT_STRETCH_FRACTION_BITS;
|
||
/// 0.5 in our floating point representation.
|
||
pub const HALF: u16 = 1 << (Self::FRACTION_BITS - 1);
|
||
|
||
/// The `ultra-condensed` keyword.
|
||
pub const ULTRA_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: 50 << Self::FRACTION_BITS,
|
||
});
|
||
/// The `extra-condensed` keyword.
|
||
pub const EXTRA_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: (62 << Self::FRACTION_BITS) + Self::HALF,
|
||
});
|
||
/// The `condensed` keyword.
|
||
pub const CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: 75 << Self::FRACTION_BITS,
|
||
});
|
||
/// The `semi-condensed` keyword.
|
||
pub const SEMI_CONDENSED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: (87 << Self::FRACTION_BITS) + Self::HALF,
|
||
});
|
||
/// The `normal` keyword.
|
||
pub const NORMAL: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: 100 << Self::FRACTION_BITS,
|
||
});
|
||
/// The `semi-expanded` keyword.
|
||
pub const SEMI_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: (112 << Self::FRACTION_BITS) + Self::HALF,
|
||
});
|
||
/// The `expanded` keyword.
|
||
pub const EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: 125 << Self::FRACTION_BITS,
|
||
});
|
||
/// The `extra-expanded` keyword.
|
||
pub const EXTRA_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: 150 << Self::FRACTION_BITS,
|
||
});
|
||
/// The `ultra-expanded` keyword.
|
||
pub const ULTRA_EXPANDED: FontStretch = FontStretch(FontStretchFixedPoint {
|
||
value: 200 << Self::FRACTION_BITS,
|
||
});
|
||
|
||
/// 100%
|
||
pub fn hundred() -> Self {
|
||
Self::NORMAL
|
||
}
|
||
|
||
/// Converts to a computed percentage.
|
||
#[inline]
|
||
pub fn to_percentage(&self) -> Percentage {
|
||
Percentage(self.0.to_float() / 100.0)
|
||
}
|
||
|
||
/// Converts from a computed percentage value.
|
||
pub fn from_percentage(p: f32) -> Self {
|
||
Self(FixedPoint::from_float((p * 100.).max(0.0).min(1000.0)))
|
||
}
|
||
|
||
/// Returns a relevant stretch value from a keyword.
|
||
/// https://drafts.csswg.org/css-fonts-4/#font-stretch-prop
|
||
pub fn from_keyword(kw: specified::FontStretchKeyword) -> Self {
|
||
use specified::FontStretchKeyword::*;
|
||
match kw {
|
||
UltraCondensed => Self::ULTRA_CONDENSED,
|
||
ExtraCondensed => Self::EXTRA_CONDENSED,
|
||
Condensed => Self::CONDENSED,
|
||
SemiCondensed => Self::SEMI_CONDENSED,
|
||
Normal => Self::NORMAL,
|
||
SemiExpanded => Self::SEMI_EXPANDED,
|
||
Expanded => Self::EXPANDED,
|
||
ExtraExpanded => Self::EXTRA_EXPANDED,
|
||
UltraExpanded => Self::ULTRA_EXPANDED,
|
||
}
|
||
}
|
||
|
||
/// Returns the stretch keyword if we map to one of the relevant values.
|
||
pub fn as_keyword(&self) -> Option<specified::FontStretchKeyword> {
|
||
use specified::FontStretchKeyword::*;
|
||
// TODO: Can we use match here?
|
||
if *self == Self::ULTRA_CONDENSED {
|
||
return Some(UltraCondensed);
|
||
}
|
||
if *self == Self::EXTRA_CONDENSED {
|
||
return Some(ExtraCondensed);
|
||
}
|
||
if *self == Self::CONDENSED {
|
||
return Some(Condensed);
|
||
}
|
||
if *self == Self::SEMI_CONDENSED {
|
||
return Some(SemiCondensed);
|
||
}
|
||
if *self == Self::NORMAL {
|
||
return Some(Normal);
|
||
}
|
||
if *self == Self::SEMI_EXPANDED {
|
||
return Some(SemiExpanded);
|
||
}
|
||
if *self == Self::EXPANDED {
|
||
return Some(Expanded);
|
||
}
|
||
if *self == Self::EXTRA_EXPANDED {
|
||
return Some(ExtraExpanded);
|
||
}
|
||
if *self == Self::ULTRA_EXPANDED {
|
||
return Some(UltraExpanded);
|
||
}
|
||
None
|
||
}
|
||
}
|
||
|
||
impl ToCss for FontStretch {
|
||
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
|
||
where
|
||
W: fmt::Write,
|
||
{
|
||
self.to_percentage().to_css(dest)
|
||
}
|
||
}
|
||
|
||
impl ToAnimatedValue for FontStretch {
|
||
type AnimatedValue = Percentage;
|
||
|
||
#[inline]
|
||
fn to_animated_value(self) -> Self::AnimatedValue {
|
||
self.to_percentage()
|
||
}
|
||
|
||
#[inline]
|
||
fn from_animated_value(animated: Self::AnimatedValue) -> Self {
|
||
Self::from_percentage(animated.0)
|
||
}
|
||
}
|