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LibWeb: Add Animation helpers needed for update_finished_state

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Matthew Olsson 2023-11-04 12:23:26 -07:00 • committed by Andreas Kling
parent 1daded768d
commit 8053d40fd5
2 changed files with 68 additions and 0 deletions
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63
Userland/Libraries/LibWeb/Animations/Animation.cpp
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@ -292,6 +292,69 @@ Bindings::AnimationPlayState Animation::play_state() const
return Bindings::AnimationPlayState::Running;
}
// https://www.w3.org/TR/web-animations-1/#animation-time-to-timeline-time
Optional<double> Animation::convert_an_animation_time_to_timeline_time(Optional<double> time) const
{
// 1. If time is unresolved, return time.
if (!time.has_value())
return time;
// 2. If time is infinity, return an unresolved time value.
if (isinf(time.value()))
return {};
// 3. If animation’s playback rate is zero, return an unresolved time value.
if (m_playback_rate == 0.0)
return {};
// 4. If animation’s start time is unresolved, return an unresolved time value.
if (!m_start_time.has_value())
return {};
// 5. Return the result of calculating: time × (1 / playback rate) + start time (where playback rate and start time
// are the playback rate and start time of animation, respectively).
return (time.value() * (1.0 / m_playback_rate)) + m_start_time.value();
}
// https://www.w3.org/TR/web-animations-1/#animation-time-to-origin-relative-time
Optional<double> Animation::convert_a_timeline_time_to_an_origin_relative_time(Optional<double> time) const
{
// 1. Let timeline time be the result of converting time from an animation time to a timeline time.
auto timeline_time = convert_an_animation_time_to_timeline_time(time);
// 2. If timeline time is unresolved, return time.
if (!timeline_time.has_value())
return time;
// 3. If animation is not associated with a timeline, return an unresolved time value.
if (!m_timeline)
return {};
// 4. If animation is associated with an inactive timeline, return an unresolved time value.
if (m_timeline->is_inactive())
return {};
// 5. If there is no procedure to convert a timeline time to an origin-relative time for the timeline associated
// with animation, return an unresolved time value.
if (!m_timeline->can_convert_a_timeline_time_to_an_original_relative_time())
return {};
// 6. Return the result of converting timeline time to an origin-relative time using the procedure defined for the
// timeline associated with animation.
return m_timeline->convert_a_timeline_time_to_an_original_relative_time(timeline_time);
}
// https://www.w3.org/TR/web-animations-1/#animation-document-for-timing
JS::GCPtr<DOM::Document> Animation::document_for_timing() const
{
// An animation’s document for timing is the Document with which its timeline is associated. If an animation is not
// associated with a timeline, or its timeline is not associated with a document, then it has no document for
// timing.
if (!m_timeline)
return {};
return m_timeline->associated_document();
}
// https://www.w3.org/TR/web-animations-1/#associated-effect-end
double Animation::associated_effect_end() const
{