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Diffstat (limited to 'servo/components/style/values/animated/color.rs')
-rw-r--r-- | servo/components/style/values/animated/color.rs | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/servo/components/style/values/animated/color.rs b/servo/components/style/values/animated/color.rs new file mode 100644 index 0000000000..3e05ba724d --- /dev/null +++ b/servo/components/style/values/animated/color.rs @@ -0,0 +1,88 @@ +/* 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/. */ + +//! Animated types for CSS colors. + +use crate::color::mix::ColorInterpolationMethod; +use crate::color::AbsoluteColor; +use crate::values::animated::{Animate, Procedure, ToAnimatedZero}; +use crate::values::computed::Percentage; +use crate::values::distance::{ComputeSquaredDistance, SquaredDistance}; +use crate::values::generics::color::{GenericColor, GenericColorMix}; + +impl Animate for AbsoluteColor { + #[inline] + fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> { + let (left_weight, right_weight) = procedure.weights(); + Ok(crate::color::mix::mix( + ColorInterpolationMethod::best_interpolation_between(self, other), + self, + left_weight as f32, + other, + right_weight as f32, + /* normalize_weights = */ false, + )) + } +} + +impl ComputeSquaredDistance for AbsoluteColor { + #[inline] + fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> { + let start = [ + self.alpha, + self.components.0 * self.alpha, + self.components.1 * self.alpha, + self.components.2 * self.alpha, + ]; + let end = [ + other.alpha, + other.components.0 * other.alpha, + other.components.1 * other.alpha, + other.components.2 * other.alpha, + ]; + start + .iter() + .zip(&end) + .map(|(this, other)| this.compute_squared_distance(other)) + .sum() + } +} + +/// An animated value for `<color>`. +pub type Color = GenericColor<Percentage>; + +/// An animated value for `<color-mix>`. +pub type ColorMix = GenericColorMix<Color, Percentage>; + +impl Animate for Color { + #[inline] + fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> { + let (left_weight, right_weight) = procedure.weights(); + Ok(Self::from_color_mix(ColorMix { + interpolation: ColorInterpolationMethod::srgb(), + left: self.clone(), + left_percentage: Percentage(left_weight as f32), + right: other.clone(), + right_percentage: Percentage(right_weight as f32), + // See https://github.com/w3c/csswg-drafts/issues/7324 + normalize_weights: false, + })) + } +} + +impl ComputeSquaredDistance for Color { + #[inline] + fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> { + let current_color = AbsoluteColor::transparent(); + self.resolve_to_absolute(¤t_color) + .compute_squared_distance(&other.resolve_to_absolute(¤t_color)) + } +} + +impl ToAnimatedZero for Color { + #[inline] + fn to_animated_zero(&self) -> Result<Self, ()> { + Ok(Color::Absolute(AbsoluteColor::transparent())) + } +} |