| // 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. |
| |
| #ifndef OffscreenCanvasPlaceholder_h |
| #define OffscreenCanvasPlaceholder_h |
| |
| #include <memory> |
| #include "platform/PlatformExport.h" |
| #include "platform/wtf/RefPtr.h" |
| #include "platform/wtf/WeakPtr.h" |
| |
| namespace blink { |
| |
| class OffscreenCanvasFrameDispatcher; |
| class StaticBitmapImage; |
| class WebTaskRunner; |
| |
| class PLATFORM_EXPORT OffscreenCanvasPlaceholder { |
| public: |
| ~OffscreenCanvasPlaceholder(); |
| |
| virtual void SetPlaceholderFrame(RefPtr<StaticBitmapImage>, |
| WeakPtr<OffscreenCanvasFrameDispatcher>, |
| RefPtr<WebTaskRunner>, |
| unsigned resource_id); |
| void ReleasePlaceholderFrame(); |
| |
| void SetSuspendOffscreenCanvasAnimation(bool); |
| |
| static OffscreenCanvasPlaceholder* GetPlaceholderById( |
| unsigned placeholder_id); |
| |
| void RegisterPlaceholder(unsigned placeholder_id); |
| void UnregisterPlaceholder(); |
| const RefPtr<StaticBitmapImage>& PlaceholderFrame() const { |
| return placeholder_frame_; |
| } |
| |
| private: |
| bool IsPlaceholderRegistered() const { |
| return placeholder_id_ != kNoPlaceholderId; |
| } |
| bool PostSetSuspendAnimationToOffscreenCanvasThread(bool suspend); |
| |
| RefPtr<StaticBitmapImage> placeholder_frame_; |
| WeakPtr<OffscreenCanvasFrameDispatcher> frame_dispatcher_; |
| RefPtr<WebTaskRunner> frame_dispatcher_task_runner_; |
| unsigned placeholder_frame_resource_id_ = 0; |
| |
| enum { |
| kNoPlaceholderId = -1, |
| }; |
| int placeholder_id_ = kNoPlaceholderId; |
| |
| enum AnimationState { |
| kActiveAnimation, |
| kSuspendedAnimation, |
| kShouldSuspendAnimation, |
| kShouldActivateAnimation, |
| }; |
| AnimationState animation_state_ = kActiveAnimation; |
| }; |
| |
| } // blink |
| |
| #endif |