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LibWeb: Generate correct timestamp values when updating animations

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Previously, we were generating timestamps relative to the current time
of the monotonic clock. We now generate timestamps relative to the
event loop's last render opportunity time, per the spec.
This commit is contained in:
Tim Ledbetter 2025-01-24 20:10:20 +00:00 • committed by Luke Wilde
commit 8b5a25e47f
Notes: github-actions[bot] 2025-01-28 11:32:54 +00:00
2 changed files with 9 additions and 7 deletions
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8
Libraries/LibWeb/Animations/DocumentTimeline.cpp
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@ -11,6 +11,7 @@
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/Window.h>
#include <LibWeb/HighResolutionTime/Performance.h>
#include <LibWeb/HighResolutionTime/TimeOrigin.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
namespace Web::Animations {
@ -22,10 +23,9 @@ GC::Ref<DocumentTimeline> DocumentTimeline::create(JS::Realm& realm, DOM::Docume
auto timeline = realm.create<DocumentTimeline>(realm, document, origin_time);
auto current_time = document.last_animation_frame_timestamp();
if (!current_time.has_value()) {
// The document hasn't processed an animation frame yet, so just use the exact current time
auto* window_or_worker = dynamic_cast<HTML::WindowOrWorkerGlobalScopeMixin*>(&realm.global_object());
VERIFY(window_or_worker);
current_time = window_or_worker->performance()->now();
// The document hasn't processed an animation frame yet, we use the navigation start time, which is either the time
// that the previous document started to be unloaded or the creation time of the current document.
current_time = HighResolutionTime::relative_high_resolution_time(document.load_timing_info().navigation_start_time, realm.global_object());
}
timeline->set_current_time(current_time);
return timeline;