1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188

/* 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 http://mozilla.org/MPL/2.0/. */

//! Animated types for CSS values related to effects.

use properties::longhands::box_shadow::computed_value::T as ComputedBoxShadowList;
use properties::longhands::filter::computed_value::T as ComputedFilterList;
use properties::longhands::text_shadow::computed_value::T as ComputedTextShadowList;
use std::cmp;
#[cfg(not(feature = "gecko"))]
use values::Impossible;
use values::animated::{Animate, Procedure, ToAnimatedValue, ToAnimatedZero};
use values::animated::color::RGBA;
use values::computed::{Angle, NonNegativeNumber};
use values::computed::length::{Length, NonNegativeLength};
use values::distance::{ComputeSquaredDistance, SquaredDistance};
use values::generics::effects::BoxShadow as GenericBoxShadow;
use values::generics::effects::Filter as GenericFilter;
use values::generics::effects::SimpleShadow as GenericSimpleShadow;

/// An animated value for the `box-shadow` property.
pub type BoxShadowList = ShadowList<BoxShadow>;

/// An animated value for the `text-shadow` property.
pub type TextShadowList = ShadowList<SimpleShadow>;

/// An animated value for shadow lists.
///
/// <https://drafts.csswg.org/css-transitions/#animtype-shadow-list>
#[cfg_attr(feature = "servo", derive(MallocSizeOf))]
#[derive(Clone, Debug, PartialEq)]
pub struct ShadowList<Shadow>(Vec<Shadow>);

/// An animated value for a single `box-shadow`.
pub type BoxShadow = GenericBoxShadow<Option<RGBA>, Length, NonNegativeLength, Length>;

/// An animated value for the `filter` property.
#[cfg_attr(feature = "servo", derive(MallocSizeOf))]
#[derive(Clone, Debug, PartialEq)]
pub struct FilterList(pub Vec<Filter>);

/// An animated value for a single `filter`.
#[cfg(feature = "gecko")]
pub type Filter = GenericFilter<Angle, NonNegativeNumber, NonNegativeLength, SimpleShadow>;

/// An animated value for a single `filter`.
#[cfg(not(feature = "gecko"))]
pub type Filter = GenericFilter<Angle, NonNegativeNumber, NonNegativeLength, Impossible>;

/// An animated value for the `drop-shadow()` filter.
pub type SimpleShadow = GenericSimpleShadow<Option<RGBA>, Length, NonNegativeLength>;

impl ToAnimatedValue for ComputedBoxShadowList {
    type AnimatedValue = BoxShadowList;

    #[inline]
    fn to_animated_value(self) -> Self::AnimatedValue {
        ShadowList(self.0.to_animated_value())
    }

    #[inline]
    fn from_animated_value(animated: Self::AnimatedValue) -> Self {
        ComputedBoxShadowList(ToAnimatedValue::from_animated_value(animated.0))
    }
}

impl<S> Animate for ShadowList<S>
where
    S: Animate + Clone + ToAnimatedZero,
{
    #[inline]
    fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
        if procedure == Procedure::Add {
            return Ok(ShadowList(
                self.0.iter().chain(&other.0).cloned().collect(),
            ));
        }
        // FIXME(nox): Use itertools here, to avoid the need for `unreachable!`.
        let max_len = cmp::max(self.0.len(), other.0.len());
        let mut shadows = Vec::with_capacity(max_len);
        for i in 0..max_len {
            shadows.push(match (self.0.get(i), other.0.get(i)) {
                (Some(shadow), Some(other)) => {
                    shadow.animate(other, procedure)?
                },
                (Some(shadow), None) => {
                    shadow.animate(&shadow.to_animated_zero()?, procedure)?
                },
                (None, Some(shadow)) => {
                    shadow.to_animated_zero()?.animate(shadow, procedure)?
                },
                (None, None) => unreachable!(),
            });
        }
        Ok(ShadowList(shadows))
    }
}

impl<S> ComputeSquaredDistance for ShadowList<S>
where
    S: ComputeSquaredDistance + ToAnimatedZero,
{
    #[inline]
    fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> {
        use itertools::{EitherOrBoth, Itertools};

        self.0.iter().zip_longest(other.0.iter()).map(|it| {
            match it {
                EitherOrBoth::Both(from, to) => {
                    from.compute_squared_distance(to)
                },
                EitherOrBoth::Left(list) | EitherOrBoth::Right(list) => {
                    list.compute_squared_distance(&list.to_animated_zero()?)
                },
            }
        }).sum()
    }
}

impl<S> ToAnimatedZero for ShadowList<S> {
    #[inline]
    fn to_animated_zero(&self) -> Result<Self, ()> {
        Ok(ShadowList(vec![]))
    }
}

impl ToAnimatedValue for ComputedTextShadowList {
    type AnimatedValue = TextShadowList;

    #[inline]
    fn to_animated_value(self) -> Self::AnimatedValue {
        ShadowList(self.0.to_animated_value())
    }

    #[inline]
    fn from_animated_value(animated: Self::AnimatedValue) -> Self {
        ComputedTextShadowList(ToAnimatedValue::from_animated_value(animated.0))
    }
}

impl ComputeSquaredDistance for BoxShadow {
    #[inline]
    fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> {
        if self.inset != other.inset {
            return Err(());
        }
        Ok(
            self.base.compute_squared_distance(&other.base)? +
            self.spread.compute_squared_distance(&other.spread)?,
        )
    }
}

impl ToAnimatedValue for ComputedFilterList {
    type AnimatedValue = FilterList;

    #[cfg(not(feature = "gecko"))]
    #[inline]
    fn to_animated_value(self) -> Self::AnimatedValue {
        FilterList(self.0)
    }

    #[cfg(feature = "gecko")]
    #[inline]
    fn to_animated_value(self) -> Self::AnimatedValue {
        FilterList(self.0.to_animated_value())
    }

    #[cfg(not(feature = "gecko"))]
    #[inline]
    fn from_animated_value(animated: Self::AnimatedValue) -> Self {
        ComputedFilterList(animated.0)
    }

    #[cfg(feature = "gecko")]
    #[inline]
    fn from_animated_value(animated: Self::AnimatedValue) -> Self {
        ComputedFilterList(ToAnimatedValue::from_animated_value(animated.0))
    }
}

impl ToAnimatedZero for FilterList {
    #[inline]
    fn to_animated_zero(&self) -> Result<Self, ()> {
        Ok(FilterList(vec![]))
    }
}