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style: Drop frames() timing function.

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frames() timing function was removed from the spec, so we drop it.
Besides, some devtool tests are removed because they use frame(). I will
add them back by using new step function later.

Differential Revision: https://phabricator.services.mozilla.com/D9309
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Boris Chiou 2018-10-26 18:03:24 +00:00 • committed by Emilio Cobos Álvarez
parent 990f2c6bb9
commit 3a536f463c
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4 changed files with 4 additions and 71 deletions
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16
components/style/animation.rs
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@ -369,22 +369,6 @@ impl PropertyAnimation {
GenericTimingFunction::Steps(steps, StepPosition::End) => {
(time * (steps as f64)).floor() / (steps as f64)
},
GenericTimingFunction::Frames(frames) => {
// https://drafts.csswg.org/css-timing/#frames-timing-functions
let mut out = (time * (frames as f64)).floor() / ((frames - 1) as f64);
if out > 1.0 {
// FIXME: Basically, during the animation sampling process, the input progress
// should be in the range of [0, 1]. However, |time| is not accurate enough
// here, which means |time| could be larger than 1.0 in the last animation
// frame. (It should be equal to 1.0 exactly.) This makes the output of frames
// timing function jumps to the next frame/level.
// However, this solution is still not correct because |time| is possible
// outside the range of [0, 1] after introducing Web Animations. We should fix
// this problem when implementing web animations.
out = 1.0;
}
out
},
GenericTimingFunction::Keyword(keyword) => {
let (x1, x2, y1, y2) = keyword.to_bezier();
Bezier::new(x1, x2, y1, y2).solve(time, epsilon)