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Handle case of empty transform lists

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This commit is contained in:
Manish Goregaokar 2017-10-30 18:52:55 -07:00
parent 9c9a181f35
commit ca02785e02
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GPG key ID: 3BBF4D3E2EF79F98
1 changed files with 38 additions and 19 deletions
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57
components/style/properties/helpers/animated_properties.mako.rs
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@ -2247,16 +2247,28 @@ impl Animate for ComputedTransform {
#[inline]
fn animate(
&self,
other: &Self,
other_: &Self,
procedure: Procedure,
) -> Result<Self, ()> {
if self.0.is_empty() && other.0.is_empty() {
let animate_equal_lists = |this: &[ComputedTransformOperation],
other: &[ComputedTransformOperation]|
-> Result<ComputedTransform, ()> {
Ok(Transform(this.iter().zip(other)
.map(|(this, other)| this.animate(other, procedure))
.collect::<Result<Vec<_>, _>>()?))
// If we can't animate for a pair of matched transform lists
// this means we have at least one undecomposable matrix,
// so we should bubble out Err here, and let the caller do
// the fallback procedure.
};
if self.0.is_empty() && other_.0.is_empty() {
return Ok(Transform(vec![]));
}
let this = &self.0;
let other = &other.0;
let other = &other_.0;
if procedure == Procedure::Add {
let result = this.iter().chain(other).cloned().collect::<Vec<_>>();
@ -2272,36 +2284,43 @@ impl Animate for ComputedTransform {
});
if is_matched_transforms {
let result = this.iter().zip(other).map(|(this, other)| {
this.animate(other, procedure)
}).collect::<Result<Vec<_>, _>>();
if let Ok(list) = result {
return Ok(Transform(list));
}
// Can't animate for a pair of matched transform lists?
// This means we have at least one undecomposable matrix,
// so we should report Err here, and let the caller do
// the fallback procedure.
return Err(());
return animate_equal_lists(this, other);
}
}
}
// For mismatched transform lists.
let mut owned_this = this.clone();
let mut owned_other = other.clone();
if this.is_empty() {
let this = other_.to_animated_zero()?.0;
if this.iter().zip(other).all(|(this, other)| is_matched_operation(this, other)) {
return animate_equal_lists(&this, other)
}
owned_this = this;
}
if other.is_empty() {
let other = self.to_animated_zero()?.0;
if this.iter().zip(&other).all(|(this, other)| is_matched_operation(this, other)) {
return animate_equal_lists(this, &other)
}
owned_other = other;
}
match procedure {
Procedure::Add => Err(()),
Procedure::Interpolate { progress } => {
Ok(Transform(vec![TransformOperation::InterpolateMatrix {
from_list: Transform(this.clone()),
to_list: Transform(other.clone()),
from_list: Transform(owned_this),
to_list: Transform(owned_other),
progress: Percentage(progress as f32),
}]))
},
Procedure::Accumulate { count } => {
Ok(Transform(vec![TransformOperation::AccumulateMatrix {
from_list: Transform(this.clone()),
to_list: Transform(other.clone()),
from_list: Transform(owned_this),
to_list: Transform(owned_other),
count: cmp::min(count, i32::max_value() as u64) as i32,
}]))
},