Index: content/browser/compositor/gpu_vsync_begin_frame_source.h |
diff --git a/content/browser/compositor/gpu_vsync_begin_frame_source.h b/content/browser/compositor/gpu_vsync_begin_frame_source.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..a701f98433f420d3b405aeaa65ef4a4ddaf3bfa6 |
--- /dev/null |
+++ b/content/browser/compositor/gpu_vsync_begin_frame_source.h |
@@ -0,0 +1,44 @@ |
+// 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 CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_ |
+#define CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_ |
+ |
+#include "base/memory/weak_ptr.h" |
+#include "base/time/time.h" |
+#include "cc/scheduler/begin_frame_source.h" |
+ |
+namespace content { |
+ |
+// This class is used to control VSync production on GPU side. |
+class GpuVSyncControl { |
+ public: |
+ virtual void SetNeedsVSync(bool needs_vsync) = 0; |
+}; |
+ |
+// This is a type of ExternalBeginFrameSource where VSync signals are |
+// generated externally on GPU side. |
+class GpuVSyncBeginFrameSource : public cc::ExternalBeginFrameSource, |
+ cc::ExternalBeginFrameSourceClient { |
+ public: |
+ explicit GpuVSyncBeginFrameSource(GpuVSyncControl* vsync_control); |
+ ~GpuVSyncBeginFrameSource() override; |
+ |
+ // cc::ExternalBeginFrameSourceClient implementation. |
+ void OnNeedsBeginFrames(bool needs_begin_frames) override; |
+ void OnDidFinishFrame(const cc::BeginFrameAck& ack) override; |
+ |
+ void OnVSync(base::TimeTicks timestamp, base::TimeDelta interval); |
+ |
+ private: |
+ GpuVSyncControl* const vsync_control_; |
+ bool needs_begin_frames_; |
+ uint64_t next_sequence_number_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(GpuVSyncBeginFrameSource); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_ |