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2bd75ae8ba
The current implementation only deals with Android devices and we'll add iOS devices support soon.
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_SHELL_COMMON_VSYNC_WAITER_H_
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#define FLUTTER_SHELL_COMMON_VSYNC_WAITER_H_
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#include <functional>
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#include <memory>
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#include <mutex>
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#include "flutter/common/task_runners.h"
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#include "flutter/fml/time/time_point.h"
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namespace shell {
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constexpr float kUnknownRefreshRateFPS = 0.0;
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class VsyncWaiter : public std::enable_shared_from_this<VsyncWaiter> {
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public:
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using Callback = std::function<void(fml::TimePoint frame_start_time,
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fml::TimePoint frame_target_time)>;
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virtual ~VsyncWaiter();
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void AsyncWaitForVsync(Callback callback);
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void FireCallback(fml::TimePoint frame_start_time,
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fml::TimePoint frame_target_time);
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// Get the display's maximum refresh rate in the unit of frame per second.
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// Return 0.0 if the refresh rate is unkonwn.
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virtual float GetDisplayRefreshRate() const { return 0.0; }
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protected:
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const blink::TaskRunners task_runners_;
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std::mutex callback_mutex_;
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Callback callback_;
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VsyncWaiter(blink::TaskRunners task_runners);
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virtual void AwaitVSync() = 0;
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FML_DISALLOW_COPY_AND_ASSIGN(VsyncWaiter);
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};
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} // namespace shell
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#endif // FLUTTER_SHELL_COMMON_VSYNC_WAITER_H_
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