| // 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_WORKERS_WORKER_ANIMATION_FRAME_PROVIDER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_WORKERS_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 GarbageCollectedFinalized<WorkerAnimationFrameProvider>, |
| public BeginFrameProviderClient { |
| public: |
| static WorkerAnimationFrameProvider* Create( |
| ExecutionContext* context, |
| const BeginFrameProviderParams& begin_frame_provider_params) { |
| return new WorkerAnimationFrameProvider(context, |
| begin_frame_provider_params); |
| } |
| |
| int RegisterCallback(FrameRequestCallbackCollection::FrameCallback* callback); |
| void CancelCallback(int id); |
| |
| void Trace(blink::Visitor* visitor); |
| |
| // BeginFrameProviderClient |
| void BeginFrame() override; |
| bool InBeginFrame() const; |
| |
| void RegisterOffscreenCanvas(OffscreenCanvas*); |
| void DeregisterOffscreenCanvas(OffscreenCanvas*); |
| |
| protected: |
| WorkerAnimationFrameProvider( |
| ExecutionContext* context, |
| const BeginFrameProviderParams& begin_frame_provider_params); |
| |
| private: |
| const std::unique_ptr<BeginFrameProvider> begin_frame_provider_; |
| DISALLOW_COPY_AND_ASSIGN(WorkerAnimationFrameProvider); |
| FrameRequestCallbackCollection callback_collection_; |
| |
| HeapVector<Member<OffscreenCanvas>> offscreen_canvases_; |
| bool in_begin_frame_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_WORKERS_WORKER_ANIMATION_FRAME_PROVIDER_H_ |