Index: cc/surfaces/display_begin_frame_source.h |
diff --git a/cc/surfaces/display_begin_frame_source.h b/cc/surfaces/display_begin_frame_source.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..055137ec74d1b5ebc520e919936e2cac3c6231e3 |
--- /dev/null |
+++ b/cc/surfaces/display_begin_frame_source.h |
@@ -0,0 +1,68 @@ |
+// 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 CC_SURFACES_DISPLAY_BEGIN_FRAME_SOURCE_H_ |
+#define CC_SURFACES_DISPLAY_BEGIN_FRAME_SOURCE_H_ |
+ |
+#include <memory> |
+#include <set> |
+ |
+#include "base/macros.h" |
+#include "cc/scheduler/begin_frame_source.h" |
+ |
+namespace cc { |
+ |
+class DisplayBeginFrameSourceClient { |
+ public: |
+ virtual void ObserverStatusChanged() = 0; |
+ virtual void BeginFrameSourceSwapping(BeginFrameSource* new_source) = 0; |
+}; |
+ |
+// Wraps a target BeginFrameSource and keeps track of observers that have |
+// finished a BeginFrame. Supports swapping the target source underneath it. |
+class DisplayBeginFrameSource : public BeginFrameSource, |
+ public BeginFrameObserver { |
+ public: |
+ explicit DisplayBeginFrameSource( |
+ std::unique_ptr<BeginFrameSource> target_source); |
+ ~DisplayBeginFrameSource() override; |
+ |
+ BeginFrameSource* GetTargetSource() { return target_source_.get(); } |
+ void SetClient(DisplayBeginFrameSourceClient* client) { client_ = client; } |
+ |
+ bool AllObserversFinishedFrame(); |
+ |
+ void SwapTargetSource(std::unique_ptr<BeginFrameSource>* begin_frame_source); |
+ |
+ // BeginFrameSource implementation. |
+ void DidFinishFrame(BeginFrameObserver* obs, |
+ size_t remaining_frames) override; |
+ void AddObserver(BeginFrameObserver* obs) override; |
+ void RemoveObserver(BeginFrameObserver* obs) override; |
+ bool IsThrottled() const override; |
+ |
+ // BeginFrameObserver implementation. |
+ void OnBeginFrame(const BeginFrameArgs& args) override; |
+ const BeginFrameArgs& LastUsedBeginFrameArgs() const override; |
+ void OnBeginFrameSourcePausedChanged(bool paused) override; |
+ |
+ private: |
+ void ObserverStatusChanged(); |
+ void MaybeFinishFrame(); |
+ |
+ std::unique_ptr<BeginFrameSource> target_source_; |
+ std::set<BeginFrameObserver*> observers_; |
+ std::set<BeginFrameObserver*> finished_observers_; |
+ BeginFrameArgs last_begin_frame_args_; |
+ bool observing_begin_frames_; |
+ bool frame_active_; |
+ |
+ DisplayBeginFrameSourceClient* client_; // Not owned. |
+ |
+ DISALLOW_COPY_AND_ASSIGN(DisplayBeginFrameSource); |
+}; |
+ |
+} // namespace cc |
+ |
+#endif // CC_SURFACES_DISPLAY_BEGIN_FRAME_SOURCE_H_ |