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style: Clamp to non-negative value after doing interpolation for circle(), ellipse(), and inset().

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Replace LengthOrPercentage with NonNegativeLengthOrPercentage on
ShapeRadius, Circle, Ellipse. And derive ToAnimatedValue for ShapeSource and
its related types, so we clamp its interpolated results into non-negative
values. (i.e. The radius of circle()/ellipse() and the border-radius of
inset().)

Note: We may get negative values when using a negative easing function, so the
clamp is necessary to avoid the incorrect result or any undefined behavior.

Differential Revision: https://phabricator.services.mozilla.com/D14654
This commit is contained in:
Boris Chiou 2018-12-19 19:08:08 +00:00 • committed by Emilio Cobos Álvarez
parent 627559546d
commit f0f3eb3194
10 changed files with 110 additions and 27 deletions
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16
components/style/values/computed/basic_shape.rs
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@ -23,20 +23,26 @@ pub type ClippingShape = generic::ClippingShape<BasicShape, ComputedUrl>;
pub type FloatAreaShape = generic::FloatAreaShape<BasicShape, Image>;
/// A computed basic shape.
pub type BasicShape =
generic::BasicShape<LengthOrPercentage, LengthOrPercentage, LengthOrPercentage, NonNegativeLengthOrPercentage>;
pub type BasicShape = generic::BasicShape<
LengthOrPercentage,
LengthOrPercentage,
LengthOrPercentage,
NonNegativeLengthOrPercentage,
>;
/// The computed value of `inset()`
pub type InsetRect = generic::InsetRect<LengthOrPercentage, NonNegativeLengthOrPercentage>;
/// A computed circle.
pub type Circle = generic::Circle<LengthOrPercentage, LengthOrPercentage, LengthOrPercentage>;
pub type Circle =
generic::Circle<LengthOrPercentage, LengthOrPercentage, NonNegativeLengthOrPercentage>;
/// A computed ellipse.
pub type Ellipse = generic::Ellipse<LengthOrPercentage, LengthOrPercentage, LengthOrPercentage>;
pub type Ellipse =
generic::Ellipse<LengthOrPercentage, LengthOrPercentage, NonNegativeLengthOrPercentage>;
/// The computed value of `ShapeRadius`
pub type ShapeRadius = generic::ShapeRadius<LengthOrPercentage>;
pub type ShapeRadius = generic::ShapeRadius<NonNegativeLengthOrPercentage>;
impl ToCss for Circle {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result