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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/animationworklet/css_animation_worklet.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
namespace blink {
// static
AnimationWorklet* CSSAnimationWorklet::animationWorklet(
ScriptState* script_state) {
LocalDOMWindow* window = ToLocalDOMWindow(script_state->GetContext());
if (!window->GetFrame())
return nullptr;
return From(*window).animation_worklet_.Get();
}
// Break the following cycle when the context gets detached.
// Otherwise, the worklet object will leak.
//
// window => CSS.animationWorklet
// => CSSAnimationWorklet
// => AnimationWorklet <--- break this reference
// => ThreadedWorkletMessagingProxy
// => Document
// => ... => window
void CSSAnimationWorklet::ContextDestroyed(ExecutionContext*) {
animation_worklet_ = nullptr;
}
void CSSAnimationWorklet::Trace(blink::Visitor* visitor) {
visitor->Trace(animation_worklet_);
Supplement<LocalDOMWindow>::Trace(visitor);
ContextLifecycleObserver::Trace(visitor);
}
// static
CSSAnimationWorklet& CSSAnimationWorklet::From(LocalDOMWindow& window) {
CSSAnimationWorklet* supplement =
Supplement<LocalDOMWindow>::From<CSSAnimationWorklet>(window);
if (!supplement) {
supplement = new CSSAnimationWorklet(window.GetFrame()->GetDocument());
ProvideTo(window, supplement);
}
return *supplement;
}
CSSAnimationWorklet::CSSAnimationWorklet(Document* document)
: ContextLifecycleObserver(document),
animation_worklet_(new AnimationWorklet(document)) {
DCHECK(GetExecutionContext());
}
const char CSSAnimationWorklet::kSupplementName[] = "CSSAnimationWorklet";
} // namespace blink
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