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Rewrite compute_squared_distance for AnimatedFilterList.

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This commit is contained in:
Boris Chiou 2017-07-27 12:43:23 +08:00
parent 20e3508ca3
commit 902819590f
4 changed files with 16 additions and 29 deletions
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42
components/style/properties/helpers/animated_properties.mako.rs
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@ -3179,37 +3179,21 @@ impl Animatable for AnimatedFilterList {
#[inline]
fn compute_squared_distance(&self, other: &Self) -> Result<f64, ()> {
use itertools::{EitherOrBoth, Itertools};
let mut square_distance: f64 = 0.0;
let mut from_iter = self.0.iter();
let mut to_iter = other.0.iter();
let mut from = from_iter.next();
let mut to = to_iter.next();
while from.is_some() || to.is_some() {
let current_square_distance: f64 ;
if from.is_none() {
let none = try!(add_weighted_filter_function(to, to, 0.0, 0.0));
current_square_distance =
compute_filter_square_distance(&none, &(to.unwrap())).unwrap();
to = to_iter.next();
} else if to.is_none() {
let none = try!(add_weighted_filter_function(from, from, 0.0, 0.0));
current_square_distance =
compute_filter_square_distance(&none, &(from.unwrap())).unwrap();
from = from_iter.next();
} else {
current_square_distance =
compute_filter_square_distance(&(from.unwrap()),
&(to.unwrap())).unwrap();
from = from_iter.next();
to = to_iter.next();
}
square_distance += current_square_distance;
for it in self.0.iter().zip_longest(other.0.iter()) {
square_distance += match it {
EitherOrBoth::Both(from, to) => {
compute_filter_square_distance(&from, &to)?
},
EitherOrBoth::Left(list) | EitherOrBoth::Right(list)=> {
let none = add_weighted_filter_function(Some(list), Some(list), 0.0, 0.0)?;
compute_filter_square_distance(&none, &list)?
},
};
}
Ok(square_distance.sqrt())
Ok(square_distance)
}
}