Remove screen capturers from media/video/capture/screen.

media/video/capture/screen/screen_capture_frame_queue.h

-// Copyright (c) 2012 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 MEDIA_VIDEO_CAPTURE_SCREEN_SCREEN_CAPTURE_FRAME_QUEUE_H_
-#define MEDIA_VIDEO_CAPTURE_SCREEN_SCREEN_CAPTURE_FRAME_QUEUE_H_
-
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "media/video/capture/screen/shared_desktop_frame.h"
-
-namespace webrtc {
-class DesktopFrame;
-}  // namespace webrtc
-
-namespace media {
-
-// Represents a queue of reusable video frames. Provides access to the 'current'
-// frame - the frame that the caller is working with at the moment, and to the
-// 'previous' frame - the predecessor of the current frame swapped by
-// MoveToNextFrame() call, if any.
-//
-// The caller is expected to (re)allocate frames if current_frame() returns
-// NULL. The caller can mark all frames in the queue for reallocation (when,
-// say, frame dimensions change). The queue records which frames need updating
-// which the caller can query.
-//
-// Frame consumer is expected to never hold more than kQueueLength frames
-// created by this function and it should release the earliest one before trying
-// to capture a new frame (i.e. before MoveToNextFrame() is called).
-class ScreenCaptureFrameQueue {
- public:
-  ScreenCaptureFrameQueue();
-  ~ScreenCaptureFrameQueue();
-
-  // Moves to the next frame in the queue, moving the 'current' frame to become
-  // the 'previous' one.
-  void MoveToNextFrame();
-
-  // Replaces the current frame with a new one allocated by the caller.
-  // The existing frame (if any) is destroyed.
-  void ReplaceCurrentFrame(scoped_ptr<webrtc::DesktopFrame> frame);
-
-  // Marks all frames obsolete and resets the previous frame pointer. No
-  // frames are freed though as the caller can still access them.
-  void Reset();
-
-  SharedDesktopFrame* current_frame() const {
-    return frames_[current_].get();
-  }
-
-  SharedDesktopFrame* previous_frame() const {
-    return frames_[(current_ + kQueueLength - 1) % kQueueLength].get();
-  }
-
- private:
-  // Index of the current frame.
-  int current_;
-
-  static const int kQueueLength = 2;
-  scoped_ptr<SharedDesktopFrame> frames_[kQueueLength];
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenCaptureFrameQueue);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_VIDEO_CAPTURE_SCREEN_SCREEN_CAPTURE_FRAME_QUEUE_H_