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/* 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/. */
//! Generic types for CSS Easing Functions.
//! https://drafts.csswg.org/css-easing/#timing-functions
use crate::parser::ParserContext;
use crate::values::CSSFloat;
/// A generic easing function.
#[derive(
Clone,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[value_info(ty = "TIMING_FUNCTION")]
#[repr(u8, C)]
pub enum TimingFunction<Integer, Number> {
/// `linear | ease | ease-in | ease-out | ease-in-out`
Keyword(TimingKeyword),
/// `cubic-bezier(<number>, <number>, <number>, <number>)`
#[allow(missing_docs)]
#[css(comma, function)]
CubicBezier {
x1: Number,
y1: Number,
x2: Number,
y2: Number,
},
/// `step-start | step-end | steps(<integer>, [ <step-position> ]?)`
/// `<step-position> = jump-start | jump-end | jump-none | jump-both | start | end`
#[css(comma, function)]
#[value_info(other_values = "step-start,step-end")]
Steps(Integer, #[css(skip_if = "is_end")] StepPosition),
}
#[allow(missing_docs)]
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
#[derive(
Clone,
Copy,
Debug,
Eq,
MallocSizeOf,
Parse,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[repr(u8)]
pub enum TimingKeyword {
Linear,
Ease,
EaseIn,
EaseOut,
EaseInOut,
}
#[cfg(feature = "gecko")]
fn step_position_jump_enabled(_context: &ParserContext) -> bool {
use crate::gecko_bindings::structs;
unsafe { structs::StaticPrefs_sVarCache_layout_css_step_position_jump_enabled }
}
#[cfg(feature = "servo")]
fn step_position_jump_enabled(_context: &ParserContext) -> bool {
false
}
#[allow(missing_docs)]
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
#[derive(
Clone,
Copy,
Debug,
Eq,
MallocSizeOf,
Parse,
PartialEq,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[repr(u8)]
pub enum StepPosition {
#[parse(condition = "step_position_jump_enabled")]
JumpStart,
#[parse(condition = "step_position_jump_enabled")]
JumpEnd,
#[parse(condition = "step_position_jump_enabled")]
JumpNone,
#[parse(condition = "step_position_jump_enabled")]
JumpBoth,
Start,
End,
}
#[inline]
fn is_end(position: &StepPosition) -> bool {
*position == StepPosition::JumpEnd || *position == StepPosition::End
}
impl<Integer, Number> TimingFunction<Integer, Number> {
/// `ease`
#[inline]
pub fn ease() -> Self {
TimingFunction::Keyword(TimingKeyword::Ease)
}
}
impl TimingKeyword {
/// Returns the keyword as a quadruplet of Bezier point coordinates
/// `(x1, y1, x2, y2)`.
#[inline]
pub fn to_bezier(self) -> (CSSFloat, CSSFloat, CSSFloat, CSSFloat) {
match self {
TimingKeyword::Linear => (0., 0., 1., 1.),
TimingKeyword::Ease => (0.25, 0.1, 0.25, 1.),
TimingKeyword::EaseIn => (0.42, 0., 1., 1.),
TimingKeyword::EaseOut => (0., 0., 0.58, 1.),
TimingKeyword::EaseInOut => (0.42, 0., 0.58, 1.),
}
}
}
|
