/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at https://mozilla.org/MPL/2.0/. */ //! Computed values. use self::transform::DirectionVector; use super::animated::ToAnimatedValue; use super::generics::grid::GridTemplateComponent as GenericGridTemplateComponent; use super::generics::grid::ImplicitGridTracks as GenericImplicitGridTracks; use super::generics::grid::{GenericGridLine, GenericTrackBreadth}; use super::generics::grid::{GenericTrackSize, TrackList as GenericTrackList}; use super::generics::transform::IsParallelTo; use super::generics::{self, GreaterThanOrEqualToOne, NonNegative, ZeroToOne}; use super::specified; use super::{CSSFloat, CSSInteger}; use crate::computed_value_flags::ComputedValueFlags; use crate::context::QuirksMode; use crate::custom_properties::ComputedCustomProperties; use crate::font_metrics::{FontMetrics, FontMetricsOrientation}; use crate::media_queries::Device; #[cfg(feature = "gecko")] use crate::properties; use crate::properties::{ComputedValues, StyleBuilder}; use crate::rule_cache::RuleCacheConditions; use crate::stylesheets::container_rule::{ ContainerInfo, ContainerSizeQuery, ContainerSizeQueryResult, }; use crate::stylist::Stylist; use crate::values::specified::length::FontBaseSize; use crate::{ArcSlice, Atom, One}; use euclid::{default, Point2D, Rect, Size2D}; use servo_arc::Arc; use std::cell::RefCell; use std::cmp; use std::f32; use std::ops::{Add, Sub}; #[cfg(feature = "gecko")] pub use self::align::{ AlignContent, AlignItems, AlignTracks, JustifyContent, JustifyItems, JustifyTracks, SelfAlignment, }; #[cfg(feature = "gecko")] pub use self::align::{AlignSelf, JustifySelf}; pub use self::angle::Angle; pub use self::animation::{ AnimationIterationCount, AnimationName, AnimationTimeline, AnimationPlayState, AnimationFillMode, AnimationComposition, AnimationDirection, ScrollAxis, ScrollTimelineName, TransitionBehavior, TransitionProperty, ViewTimelineInset }; pub use self::background::{BackgroundRepeat, BackgroundSize}; pub use self::basic_shape::FillRule; pub use self::border::{ BorderCornerRadius, BorderImageRepeat, BorderImageSideWidth, BorderImageSlice, BorderImageWidth, BorderRadius, BorderSideWidth, BorderSpacing, LineWidth, }; pub use self::box_::{ Appearance, BaselineSource, BreakBetween, BreakWithin, Clear, Contain, ContainIntrinsicSize, ContainerName, ContainerType, ContentVisibility, Display, Float, LineClamp, Overflow, OverflowAnchor, OverflowClipBox, OverscrollBehavior, Perspective, Resize, ScrollSnapAlign, ScrollSnapAxis, ScrollSnapStop, ScrollSnapStrictness, ScrollSnapType, ScrollbarGutter, TouchAction, VerticalAlign, WillChange, Zoom, }; pub use self::color::{ Color, ColorOrAuto, ColorPropertyValue, ColorScheme, ForcedColorAdjust, PrintColorAdjust, }; pub use self::column::ColumnCount; pub use self::counters::{Content, ContentItem, CounterIncrement, CounterReset, CounterSet}; pub use self::easing::TimingFunction; pub use self::effects::{BoxShadow, Filter, SimpleShadow}; pub use self::flex::FlexBasis; pub use self::font::{FontFamily, FontLanguageOverride, FontPalette, FontStyle}; pub use self::font::{FontFeatureSettings, FontVariantLigatures, FontVariantNumeric}; pub use self::font::{FontSize, FontSizeAdjust, FontStretch, FontSynthesis, LineHeight}; pub use self::font::{FontVariantAlternates, FontWeight}; pub use self::font::{FontVariantEastAsian, FontVariationSettings}; pub use self::font::{MathDepth, MozScriptMinSize, MozScriptSizeMultiplier, XLang, XTextScale}; pub use self::image::{Gradient, Image, ImageRendering, LineDirection}; pub use self::length::{CSSPixelLength, NonNegativeLength}; pub use self::length::{Length, LengthOrNumber, LengthPercentage, NonNegativeLengthOrNumber}; pub use self::length::{LengthOrAuto, LengthPercentageOrAuto, MaxSize, Size}; pub use self::length::{NonNegativeLengthPercentage, NonNegativeLengthPercentageOrAuto}; #[cfg(feature = "gecko")] pub use self::list::ListStyleType; pub use self::list::Quotes; pub use self::motion::{OffsetPath, OffsetPosition, OffsetRotate}; pub use self::outline::OutlineStyle; pub use self::page::{PageName, PageOrientation, PageSize, PageSizeOrientation, PaperSize}; pub use self::percentage::{NonNegativePercentage, Percentage}; pub use self::position::AspectRatio; pub use self::position::{ GridAutoFlow, GridTemplateAreas, MasonryAutoFlow, Position, PositionOrAuto, ZIndex, }; pub use self::ratio::Ratio; pub use self::rect::NonNegativeLengthOrNumberRect; pub use self::resolution::Resolution; pub use self::svg::{DProperty, MozContextProperties}; pub use self::svg::{SVGLength, SVGOpacity, SVGPaint, SVGPaintKind}; pub use self::svg::{SVGPaintOrder, SVGStrokeDashArray, SVGWidth}; pub use self::text::HyphenateCharacter; pub use self::text::TextUnderlinePosition; pub use self::text::{InitialLetter, LetterSpacing, LineBreak, TextIndent}; pub use self::text::{OverflowWrap, RubyPosition, TextOverflow, WordBreak, WordSpacing}; pub use self::text::{TextAlign, TextAlignLast, TextEmphasisPosition, TextEmphasisStyle}; pub use self::text::{TextDecorationLength, TextDecorationSkipInk, TextJustify}; pub use self::time::Time; pub use self::transform::{Rotate, Scale, Transform, TransformBox, TransformOperation}; pub use self::transform::{TransformOrigin, TransformStyle, Translate}; #[cfg(feature = "gecko")] pub use self::ui::CursorImage; pub use self::ui::{BoolInteger, Cursor, UserSelect}; pub use super::specified::TextTransform; pub use super::specified::ViewportVariant; pub use super::specified::{BorderStyle, TextDecorationLine}; pub use app_units::Au; #[cfg(feature = "gecko")] pub mod align; pub mod angle; pub mod animation; pub mod background; pub mod basic_shape; pub mod border; #[path = "box.rs"] pub mod box_; pub mod color; pub mod column; pub mod counters; pub mod easing; pub mod effects; pub mod flex; pub mod font; pub mod image; pub mod length; pub mod length_percentage; pub mod list; pub mod motion; pub mod outline; pub mod page; pub mod percentage; pub mod position; pub mod ratio; pub mod rect; pub mod resolution; pub mod svg; pub mod table; pub mod text; pub mod time; pub mod transform; pub mod ui; pub mod url; /// A `Context` is all the data a specified value could ever need to compute /// itself and be transformed to a computed value. pub struct Context<'a> { /// Values accessed through this need to be in the properties "computed /// early": color, text-decoration, font-size, display, position, float, /// border-*-style, outline-style, font-family, writing-mode... pub builder: StyleBuilder<'a>, /// A cached computed system font value, for use by gecko. /// /// See properties/longhands/font.mako.rs #[cfg(feature = "gecko")] pub cached_system_font: Option, /// A dummy option for servo so initializing a computed::Context isn't /// painful. /// /// TODO(emilio): Make constructors for Context, and drop this. #[cfg(feature = "servo")] pub cached_system_font: Option<()>, /// Whether or not we are computing the media list in a media query. pub in_media_query: bool, /// Whether or not we are computing the container query condition. pub in_container_query: bool, /// The quirks mode of this context. pub quirks_mode: QuirksMode, /// Whether this computation is being done for a SMIL animation. /// /// This is used to allow certain properties to generate out-of-range /// values, which SMIL allows. pub for_smil_animation: bool, /// Returns the container information to evaluate a given container query. pub container_info: Option, /// Whether we're computing a value for a non-inherited property. /// False if we are computed a value for an inherited property or not computing for a property /// at all (e.g. in a media query evaluation). pub for_non_inherited_property: bool, /// The conditions to cache a rule node on the rule cache. /// /// FIXME(emilio): Drop the refcell. pub rule_cache_conditions: RefCell<&'a mut RuleCacheConditions>, /// Container size query for this context. container_size_query: RefCell>, } impl<'a> Context<'a> { /// Lazily evaluate the container size query, returning the result. pub fn get_container_size_query(&self) -> ContainerSizeQueryResult { let mut resolved = self.container_size_query.borrow_mut(); resolved.get().clone() } /// Creates a suitable context for media query evaluation, in which /// font-relative units compute against the system_font, and executes `f` /// with it. pub fn for_media_query_evaluation(device: &Device, quirks_mode: QuirksMode, f: F) -> R where F: FnOnce(&Context) -> R, { let mut conditions = RuleCacheConditions::default(); let context = Context { builder: StyleBuilder::for_inheritance(device, None, None, None), cached_system_font: None, in_media_query: true, in_container_query: false, quirks_mode, for_smil_animation: false, container_info: None, for_non_inherited_property: false, rule_cache_conditions: RefCell::new(&mut conditions), container_size_query: RefCell::new(ContainerSizeQuery::none()), }; f(&context) } /// Creates a suitable context for container query evaluation for the style /// specified. pub fn for_container_query_evaluation( device: &Device, stylist: Option<&Stylist>, container_info_and_style: Option<(ContainerInfo, Arc)>, container_size_query: ContainerSizeQuery, f: F, ) -> R where F: FnOnce(&Context) -> R, { let mut conditions = RuleCacheConditions::default(); let (container_info, style) = match container_info_and_style { Some((ci, s)) => (Some(ci), Some(s)), None => (None, None), }; let style = style.as_ref().map(|s| &**s); let quirks_mode = device.quirks_mode(); let context = Context { builder: StyleBuilder::for_inheritance(device, stylist, style, None), cached_system_font: None, in_media_query: false, in_container_query: true, quirks_mode, for_smil_animation: false, container_info, for_non_inherited_property: false, rule_cache_conditions: RefCell::new(&mut conditions), container_size_query: RefCell::new(container_size_query), }; f(&context) } /// Creates a context suitable for more general cases. pub fn new( builder: StyleBuilder<'a>, quirks_mode: QuirksMode, rule_cache_conditions: &'a mut RuleCacheConditions, container_size_query: ContainerSizeQuery<'a>, ) -> Self { Self { builder, cached_system_font: None, in_media_query: false, in_container_query: false, quirks_mode, container_info: None, for_smil_animation: false, for_non_inherited_property: false, rule_cache_conditions: RefCell::new(rule_cache_conditions), container_size_query: RefCell::new(container_size_query), } } /// Creates a context suitable for computing animations. pub fn new_for_animation( builder: StyleBuilder<'a>, for_smil_animation: bool, quirks_mode: QuirksMode, rule_cache_conditions: &'a mut RuleCacheConditions, container_size_query: ContainerSizeQuery<'a>, ) -> Self { Self { builder, cached_system_font: None, in_media_query: false, in_container_query: false, quirks_mode, container_info: None, for_smil_animation, for_non_inherited_property: false, rule_cache_conditions: RefCell::new(rule_cache_conditions), container_size_query: RefCell::new(container_size_query), } } /// Creates a context suitable for computing the initial value of @property. pub fn new_for_initial_at_property_value( stylist: &'a Stylist, rule_cache_conditions: &'a mut RuleCacheConditions, ) -> Self { Self { builder: StyleBuilder::new(stylist.device(), Some(stylist), None, None, None, false), cached_system_font: None, // Because font-relative values are disallowed in @property initial values, we do not // need to keep track of whether we're in a media query, whether we're in a container // query, and so on. in_media_query: false, in_container_query: false, quirks_mode: stylist.quirks_mode(), container_info: None, for_smil_animation: false, for_non_inherited_property: false, rule_cache_conditions: RefCell::new(rule_cache_conditions), container_size_query: RefCell::new(ContainerSizeQuery::none()), } } /// The current device. pub fn device(&self) -> &Device { self.builder.device } /// Get the inherited custom properties map. pub fn inherited_custom_properties(&self) -> &ComputedCustomProperties { &self.builder.inherited_custom_properties() } /// Whether the style is for the root element. pub fn is_root_element(&self) -> bool { self.builder.is_root_element } /// Queries font metrics. pub fn query_font_metrics( &self, base_size: FontBaseSize, orientation: FontMetricsOrientation, retrieve_math_scales: bool, ) -> FontMetrics { if self.for_non_inherited_property { self.rule_cache_conditions.borrow_mut().set_uncacheable(); } self.builder.add_flags(match base_size { FontBaseSize::CurrentStyle => ComputedValueFlags::DEPENDS_ON_SELF_FONT_METRICS, FontBaseSize::InheritedStyle => ComputedValueFlags::DEPENDS_ON_INHERITED_FONT_METRICS, }); let size = base_size.resolve(self).used_size(); let style = self.style(); let (wm, font) = match base_size { FontBaseSize::CurrentStyle => (style.writing_mode, style.get_font()), // This is only used for font-size computation. FontBaseSize::InheritedStyle => { (*style.inherited_writing_mode(), style.get_parent_font()) }, }; let vertical = match orientation { FontMetricsOrientation::MatchContextPreferHorizontal => { wm.is_vertical() && wm.is_upright() }, FontMetricsOrientation::MatchContextPreferVertical => wm.is_text_vertical(), FontMetricsOrientation::Horizontal => false, }; self.device().query_font_metrics( vertical, font, size, self.in_media_or_container_query(), retrieve_math_scales, ) } /// The current viewport size, used to resolve viewport units. pub fn viewport_size_for_viewport_unit_resolution( &self, variant: ViewportVariant, ) -> default::Size2D { self.builder .add_flags(ComputedValueFlags::USES_VIEWPORT_UNITS); self.builder .device .au_viewport_size_for_viewport_unit_resolution(variant) } /// Whether we're in a media or container query. pub fn in_media_or_container_query(&self) -> bool { self.in_media_query || self.in_container_query } /// The default computed style we're getting our reset style from. pub fn default_style(&self) -> &ComputedValues { self.builder.default_style() } /// The current style. pub fn style(&self) -> &StyleBuilder { &self.builder } /// Apply text-zoom if enabled. #[cfg(feature = "gecko")] pub fn maybe_zoom_text(&self, size: CSSPixelLength) -> CSSPixelLength { if self .style() .get_font() .clone__x_text_scale() .text_zoom_enabled() { self.device().zoom_text(size) } else { size } } /// (Servo doesn't do text-zoom) #[cfg(feature = "servo")] pub fn maybe_zoom_text(&self, size: CSSPixelLength) -> CSSPixelLength { size } } /// An iterator over a slice of computed values #[derive(Clone)] pub struct ComputedVecIter<'a, 'cx, 'cx_a: 'cx, S: ToComputedValue + 'a> { cx: &'cx Context<'cx_a>, values: &'a [S], } impl<'a, 'cx, 'cx_a: 'cx, S: ToComputedValue + 'a> ComputedVecIter<'a, 'cx, 'cx_a, S> { /// Construct an iterator from a slice of specified values and a context pub fn new(cx: &'cx Context<'cx_a>, values: &'a [S]) -> Self { ComputedVecIter { cx, values } } } impl<'a, 'cx, 'cx_a: 'cx, S: ToComputedValue + 'a> ExactSizeIterator for ComputedVecIter<'a, 'cx, 'cx_a, S> { fn len(&self) -> usize { self.values.len() } } impl<'a, 'cx, 'cx_a: 'cx, S: ToComputedValue + 'a> Iterator for ComputedVecIter<'a, 'cx, 'cx_a, S> { type Item = S::ComputedValue; fn next(&mut self) -> Option { if let Some((next, rest)) = self.values.split_first() { let ret = next.to_computed_value(self.cx); self.values = rest; Some(ret) } else { None } } fn size_hint(&self) -> (usize, Option) { (self.values.len(), Some(self.values.len())) } } /// A trait to represent the conversion between computed and specified values. /// /// This trait is derivable with `#[derive(ToComputedValue)]`. The derived /// implementation just calls `ToComputedValue::to_computed_value` on each field /// of the passed value. The deriving code assumes that if the type isn't /// generic, then the trait can be implemented as simple `Clone::clone` calls, /// this means that a manual implementation with `ComputedValue = Self` is bogus /// if it returns anything else than a clone. pub trait ToComputedValue { /// The computed value type we're going to be converted to. type ComputedValue; /// Convert a specified value to a computed value, using itself and the data /// inside the `Context`. fn to_computed_value(&self, context: &Context) -> Self::ComputedValue; /// Convert a computed value to specified value form. /// /// This will be used for recascading during animation. /// Such from_computed_valued values should recompute to the same value. fn from_computed_value(computed: &Self::ComputedValue) -> Self; } impl ToComputedValue for (A, B) where A: ToComputedValue, B: ToComputedValue, { type ComputedValue = ( ::ComputedValue, ::ComputedValue, ); #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { ( self.0.to_computed_value(context), self.1.to_computed_value(context), ) } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { ( A::from_computed_value(&computed.0), B::from_computed_value(&computed.1), ) } } impl ToComputedValue for Option where T: ToComputedValue, { type ComputedValue = Option<::ComputedValue>; #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { self.as_ref().map(|item| item.to_computed_value(context)) } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { computed.as_ref().map(T::from_computed_value) } } impl ToComputedValue for default::Size2D where T: ToComputedValue, { type ComputedValue = default::Size2D<::ComputedValue>; #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { Size2D::new( self.width.to_computed_value(context), self.height.to_computed_value(context), ) } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { Size2D::new( T::from_computed_value(&computed.width), T::from_computed_value(&computed.height), ) } } impl ToComputedValue for Vec where T: ToComputedValue, { type ComputedValue = Vec<::ComputedValue>; #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { self.iter() .map(|item| item.to_computed_value(context)) .collect() } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { computed.iter().map(T::from_computed_value).collect() } } impl ToComputedValue for Box where T: ToComputedValue, { type ComputedValue = Box<::ComputedValue>; #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { Box::new(T::to_computed_value(self, context)) } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { Box::new(T::from_computed_value(computed)) } } impl ToComputedValue for Box<[T]> where T: ToComputedValue, { type ComputedValue = Box<[::ComputedValue]>; #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { self.iter() .map(|item| item.to_computed_value(context)) .collect::>() .into_boxed_slice() } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { computed .iter() .map(T::from_computed_value) .collect::>() .into_boxed_slice() } } impl ToComputedValue for crate::OwnedSlice where T: ToComputedValue, { type ComputedValue = crate::OwnedSlice<::ComputedValue>; #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { self.iter() .map(|item| item.to_computed_value(context)) .collect() } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { computed.iter().map(T::from_computed_value).collect() } } impl ToComputedValue for thin_vec::ThinVec where T: ToComputedValue, { type ComputedValue = thin_vec::ThinVec<::ComputedValue>; #[inline] fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { self.iter() .map(|item| item.to_computed_value(context)) .collect() } #[inline] fn from_computed_value(computed: &Self::ComputedValue) -> Self { computed.iter().map(T::from_computed_value).collect() } } // NOTE(emilio): This is implementable more generically, but it's unlikely // what you want there, as it forces you to have an extra allocation. // // We could do that if needed, ideally with specialization for the case where // ComputedValue = T. But we don't need it for now. impl ToComputedValue for Arc where T: ToComputedValue, { type ComputedValue = Self; #[inline] fn to_computed_value(&self, _: &Context) -> Self { self.clone() } #[inline] fn from_computed_value(computed: &Self) -> Self { computed.clone() } } // Same caveat as above applies. impl ToComputedValue for ArcSlice where T: ToComputedValue, { type ComputedValue = Self; #[inline] fn to_computed_value(&self, _: &Context) -> Self { self.clone() } #[inline] fn from_computed_value(computed: &Self) -> Self { computed.clone() } } trivial_to_computed_value!(()); trivial_to_computed_value!(bool); trivial_to_computed_value!(f32); trivial_to_computed_value!(i32); trivial_to_computed_value!(u8); trivial_to_computed_value!(u16); trivial_to_computed_value!(u32); trivial_to_computed_value!(usize); trivial_to_computed_value!(Atom); trivial_to_computed_value!(crate::values::AtomIdent); #[cfg(feature = "servo")] trivial_to_computed_value!(crate::Namespace); #[cfg(feature = "servo")] trivial_to_computed_value!(crate::Prefix); trivial_to_computed_value!(String); trivial_to_computed_value!(Box); trivial_to_computed_value!(crate::OwnedStr); trivial_to_computed_value!(style_traits::values::specified::AllowedNumericType); trivial_to_computed_value!(crate::values::generics::color::ColorMixFlags); #[allow(missing_docs)] #[derive( Animate, Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf, PartialEq, ToAnimatedZero, ToCss, ToResolvedValue, )] #[repr(C, u8)] pub enum AngleOrPercentage { Percentage(Percentage), Angle(Angle), } impl ToComputedValue for specified::AngleOrPercentage { type ComputedValue = AngleOrPercentage; #[inline] fn to_computed_value(&self, context: &Context) -> AngleOrPercentage { match *self { specified::AngleOrPercentage::Percentage(percentage) => { AngleOrPercentage::Percentage(percentage.to_computed_value(context)) }, specified::AngleOrPercentage::Angle(angle) => { AngleOrPercentage::Angle(angle.to_computed_value(context)) }, } } #[inline] fn from_computed_value(computed: &AngleOrPercentage) -> Self { match *computed { AngleOrPercentage::Percentage(percentage) => specified::AngleOrPercentage::Percentage( ToComputedValue::from_computed_value(&percentage), ), AngleOrPercentage::Angle(angle) => { specified::AngleOrPercentage::Angle(ToComputedValue::from_computed_value(&angle)) }, } } } /// A `` value. pub type Number = CSSFloat; impl IsParallelTo for (Number, Number, Number) { fn is_parallel_to(&self, vector: &DirectionVector) -> bool { use euclid::approxeq::ApproxEq; // If a and b is parallel, the angle between them is 0deg, so // a x b = |a|*|b|*sin(0)*n = 0 * n, |a x b| == 0. let self_vector = DirectionVector::new(self.0, self.1, self.2); self_vector .cross(*vector) .square_length() .approx_eq(&0.0f32) } } /// A wrapper of Number, but the value >= 0. pub type NonNegativeNumber = NonNegative; impl ToAnimatedValue for NonNegativeNumber { type AnimatedValue = CSSFloat; #[inline] fn to_animated_value(self) -> Self::AnimatedValue { self.0 } #[inline] fn from_animated_value(animated: Self::AnimatedValue) -> Self { animated.max(0.).into() } } impl From for NonNegativeNumber { #[inline] fn from(number: CSSFloat) -> NonNegativeNumber { NonNegative::(number) } } impl From for CSSFloat { #[inline] fn from(number: NonNegativeNumber) -> CSSFloat { number.0 } } impl One for NonNegativeNumber { #[inline] fn one() -> Self { NonNegative(1.0) } #[inline] fn is_one(&self) -> bool { self.0 == 1.0 } } /// A wrapper of Number, but the value between 0 and 1 pub type ZeroToOneNumber = ZeroToOne; impl ToAnimatedValue for ZeroToOneNumber { type AnimatedValue = CSSFloat; #[inline] fn to_animated_value(self) -> Self::AnimatedValue { self.0 } #[inline] fn from_animated_value(animated: Self::AnimatedValue) -> Self { Self(animated.max(0.).min(1.)) } } impl From for ZeroToOneNumber { #[inline] fn from(number: CSSFloat) -> Self { Self(number) } } /// A wrapper of Number, but the value >= 1. pub type GreaterThanOrEqualToOneNumber = GreaterThanOrEqualToOne; impl ToAnimatedValue for GreaterThanOrEqualToOneNumber { type AnimatedValue = CSSFloat; #[inline] fn to_animated_value(self) -> Self::AnimatedValue { self.0 } #[inline] fn from_animated_value(animated: Self::AnimatedValue) -> Self { animated.max(1.).into() } } impl From for GreaterThanOrEqualToOneNumber { #[inline] fn from(number: CSSFloat) -> GreaterThanOrEqualToOneNumber { GreaterThanOrEqualToOne::(number) } } impl From for CSSFloat { #[inline] fn from(number: GreaterThanOrEqualToOneNumber) -> CSSFloat { number.0 } } #[allow(missing_docs)] #[derive( Animate, Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf, PartialEq, ToAnimatedZero, ToCss, ToResolvedValue, )] #[repr(C, u8)] pub enum NumberOrPercentage { Percentage(Percentage), Number(Number), } impl NumberOrPercentage { fn clamp_to_non_negative(self) -> Self { match self { NumberOrPercentage::Percentage(p) => { NumberOrPercentage::Percentage(p.clamp_to_non_negative()) }, NumberOrPercentage::Number(n) => NumberOrPercentage::Number(n.max(0.)), } } } impl ToComputedValue for specified::NumberOrPercentage { type ComputedValue = NumberOrPercentage; #[inline] fn to_computed_value(&self, context: &Context) -> NumberOrPercentage { match *self { specified::NumberOrPercentage::Percentage(percentage) => { NumberOrPercentage::Percentage(percentage.to_computed_value(context)) }, specified::NumberOrPercentage::Number(number) => { NumberOrPercentage::Number(number.to_computed_value(context)) }, } } #[inline] fn from_computed_value(computed: &NumberOrPercentage) -> Self { match *computed { NumberOrPercentage::Percentage(percentage) => { specified::NumberOrPercentage::Percentage(ToComputedValue::from_computed_value( &percentage, )) }, NumberOrPercentage::Number(number) => { specified::NumberOrPercentage::Number(ToComputedValue::from_computed_value(&number)) }, } } } /// A non-negative . pub type NonNegativeNumberOrPercentage = NonNegative; impl NonNegativeNumberOrPercentage { /// Returns the `100%` value. #[inline] pub fn hundred_percent() -> Self { NonNegative(NumberOrPercentage::Percentage(Percentage::hundred())) } } impl ToAnimatedValue for NonNegativeNumberOrPercentage { type AnimatedValue = NumberOrPercentage; #[inline] fn to_animated_value(self) -> Self::AnimatedValue { self.0 } #[inline] fn from_animated_value(animated: Self::AnimatedValue) -> Self { NonNegative(animated.clamp_to_non_negative()) } } /// A type used for opacity. pub type Opacity = CSSFloat; /// A `` value. pub type Integer = CSSInteger; /// A wrapper of Integer, but only accept a value >= 1. pub type PositiveInteger = GreaterThanOrEqualToOne; impl ToAnimatedValue for PositiveInteger { type AnimatedValue = CSSInteger; #[inline] fn to_animated_value(self) -> Self::AnimatedValue { self.0 } #[inline] fn from_animated_value(animated: Self::AnimatedValue) -> Self { cmp::max(animated, 1).into() } } impl From for PositiveInteger { #[inline] fn from(int: CSSInteger) -> PositiveInteger { GreaterThanOrEqualToOne::(int) } } /// rect(...) | auto pub type ClipRect = generics::GenericClipRect; /// rect(...) | auto pub type ClipRectOrAuto = generics::GenericClipRectOrAuto; /// The computed value of a grid `` pub type TrackBreadth = GenericTrackBreadth; /// The computed value of a grid `` pub type TrackSize = GenericTrackSize; /// The computed value of a grid `+` pub type ImplicitGridTracks = GenericImplicitGridTracks; /// The computed value of a grid `` /// (could also be `` or ``) pub type TrackList = GenericTrackList; /// The computed value of a ``. pub type GridLine = GenericGridLine; /// ` | ` pub type GridTemplateComponent = GenericGridTemplateComponent; impl ClipRect { /// Given a border box, resolves the clip rect against the border box /// in the same space the border box is in pub fn for_border_rect + Add + Sub, U>( &self, border_box: Rect, ) -> Rect { fn extract_clip_component>(p: &LengthOrAuto, or: T) -> T { match *p { LengthOrAuto::Auto => or, LengthOrAuto::LengthPercentage(ref length) => T::from(*length), } } let clip_origin = Point2D::new( From::from(self.left.auto_is(|| Length::new(0.))), From::from(self.top.auto_is(|| Length::new(0.))), ); let right = extract_clip_component(&self.right, border_box.size.width); let bottom = extract_clip_component(&self.bottom, border_box.size.height); let clip_size = Size2D::new(right - clip_origin.x, bottom - clip_origin.y); Rect::new(clip_origin, clip_size).translate(border_box.origin.to_vector()) } }