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// Copyright 2018 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_FRAME_WORKER_ANIMATION_FRAME_PROVIDER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_FRAME_WORKER_ANIMATION_FRAME_PROVIDER_H_
#include "base/macros.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/frame_request_callback_collection.h"
#include "third_party/blink/renderer/platform/graphics/begin_frame_provider.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace blink {
class OffscreenCanvas;
// WorkerAnimationFrameProvider is a member of WorkerGlobalScope and it provides
// RequestAnimationFrame capabilities to Workers.
//
// It's responsible for registering and dealing with callbacks.
// And maintains a connection with the Display process, through
// CompositorFrameSink, that is used to v-sync with the display.
//
// OffscreenCanvases can notify when there's been a change on any
// OffscreenCanvas that is connected to a Canvas, and this class signals
// OffscreenCanvases when it's time to dispatch frames.
class CORE_EXPORT WorkerAnimationFrameProvider
: public GarbageCollected<WorkerAnimationFrameProvider>,
public BeginFrameProviderClient {
public:
WorkerAnimationFrameProvider(
ExecutionContext* context,
const BeginFrameProviderParams& begin_frame_provider_params);
int RegisterCallback(FrameRequestCallbackCollection::FrameCallback* callback);
void CancelCallback(int id);
void Trace(Visitor* visitor);
// BeginFrameProviderClient
void BeginFrame(const viz::BeginFrameArgs&) override;
void RegisterOffscreenCanvas(OffscreenCanvas*);
void DeregisterOffscreenCanvas(OffscreenCanvas*);
static const int kInvalidCallbackId = -1;
private:
const std::unique_ptr<BeginFrameProvider> begin_frame_provider_;
DISALLOW_COPY_AND_ASSIGN(WorkerAnimationFrameProvider);
FrameRequestCallbackCollection callback_collection_;
// To avoid leaking OffscreenCanvas objects, the following vector must
// not hold strong references.
Vector<UntracedMember<OffscreenCanvas>> offscreen_canvases_;
Member<ExecutionContext> context_;
base::WeakPtrFactory<WorkerAnimationFrameProvider> weak_factory_{this};
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_FRAME_WORKER_ANIMATION_FRAME_PROVIDER_H_
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