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| 1 // Copyright (c) 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef GPU_IPC_SERVICE_GPU_VSYNC_PROVIDER_H_ |
| 6 #define GPU_IPC_SERVICE_GPU_VSYNC_PROVIDER_H_ |
| 7 |
| 8 #include <memory> |
| 9 |
| 10 #include "base/callback.h" |
| 11 #include "base/time/time.h" |
| 12 #include "gpu/gpu_export.h" |
| 13 #include "gpu/ipc/common/surface_handle.h" |
| 14 |
| 15 namespace gpu { |
| 16 |
| 17 class GpuVSyncWorker; |
| 18 |
| 19 // Implements waiting for VSync signal on background thread. |
| 20 class GPU_EXPORT GpuVSyncProvider { |
| 21 public: |
| 22 // Once VSync is enabled, this callback is repeatedly invoked on every VSync. |
| 23 // The call is made on background thread to avoid increased latency due to |
| 24 // serializing callback invocation with other GPU tasks. The code that |
| 25 // implements the callback function is expected to handle that. |
| 26 using VSyncCallback = base::Callback<void(base::TimeTicks timestamp)>; |
| 27 |
| 28 ~GpuVSyncProvider(); |
| 29 |
| 30 static std::unique_ptr<GpuVSyncProvider> Create(const VSyncCallback& callback, |
| 31 SurfaceHandle surface_handle); |
| 32 |
| 33 // Enable or disable VSync production. |
| 34 void EnableVSync(bool enabled); |
| 35 |
| 36 private: |
| 37 #if defined(OS_WIN) |
| 38 GpuVSyncProvider(const VSyncCallback& callback, SurfaceHandle surface_handle); |
| 39 |
| 40 std::unique_ptr<GpuVSyncWorker> vsync_worker_; |
| 41 #endif // defined(OS_WIN) |
| 42 |
| 43 DISALLOW_COPY_AND_ASSIGN(GpuVSyncProvider); |
| 44 }; |
| 45 |
| 46 } // namespace gpu |
| 47 |
| 48 #endif // GPU_IPC_SERVICE_GPU_VSYNC_PROVIDER_H_ |
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