cc/scheduler/video_frame_controller.h

// Copyright 2013 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_SCHEDULER_VIDEO_FRAME_CONTROLLER_H_
#define CC_SCHEDULER_VIDEO_FRAME_CONTROLLER_H_

#include "cc/base/cc_export.h"
#include "cc/output/begin_frame_args.h"

namespace cc {

class VideoFrameController;

class CC_EXPORT VideoFrameControllerClient {
 public:
  virtual void AddVideoFrameController(VideoFrameController* controller) = 0;
  virtual void RemoveVideoFrameController(VideoFrameController* controller) = 0;

 protected:
  virtual ~VideoFrameControllerClient() {}
};

// TODO(sunnyps): Consider making this a BeginFrameObserver some day.
class CC_EXPORT VideoFrameController {
 public:
  virtual void OnBeginFrame(const BeginFrameArgs& args) = 0;

  // Called upon completion of LayerTreeHostImpl::DidDrawAllLayers(), regardless
  // of whether the controller issued a SetNeedsRedraw().  May be used to
  // determine when SetNeedsRedraw() is called but the draw is aborted.
  virtual void DidDrawFrame() = 0;

 protected:
  virtual ~VideoFrameController() {}
};

}  // namespace cc

#endif  // CC_SCHEDULER_VIDEO_FRAME_CONTROLLER_H_