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// Copyright 2015 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_RENDERER_HOST_BEGIN_FRAME_OBSERVER_PROXY_H_
#define CONTENT_BROWSER_RENDERER_HOST_BEGIN_FRAME_OBSERVER_PROXY_H_
#include "content/common/content_export.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/compositor_observer.h"
namespace cc {
struct BeginFrameArgs;
}
namespace content {
// This is the interface from the BeginFrameObserverProxy which manages sending
// BeginFrame messages.
class BeginFrameObserverProxyClient {
public:
virtual void SendBeginFrame(const cc::BeginFrameArgs& args) = 0;
};
// This class is used to manage all of the RenderWidgetHostView state and
// functionality that is associated with BeginFrame message handling.
class CONTENT_EXPORT BeginFrameObserverProxy
: public ui::CompositorBeginFrameObserver {
public:
explicit BeginFrameObserverProxy(BeginFrameObserverProxyClient* client);
~BeginFrameObserverProxy() override;
void SetNeedsBeginFrames(bool needs_begin_frames);
void SetCompositor(ui::Compositor* compositor);
void ResetCompositor();
// Overridden from ui::CompositorBeginFrameObserver:
void OnSendBeginFrame(const cc::BeginFrameArgs& args) override;
private:
void StartObservingBeginFrames();
void StopObservingBeginFrames();
// True when RenderWidget needs a BeginFrame message.
bool needs_begin_frames_;
// Used whether to send begin frame to client or not. When |args| from
// Compositor is different from this, send to client.
cc::BeginFrameArgs last_sent_begin_frame_args_;
BeginFrameObserverProxyClient* client_;
ui::Compositor* compositor_;
DISALLOW_COPY_AND_ASSIGN(BeginFrameObserverProxy);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_BEGIN_FRAME_OBSERVER_PROXY_H_
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