content: Split out VideoCaptureMachine from DesktopCaptureDeviceAura

content/browser/media/capture/aura_window_capture_machine.h

+// 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.
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/timer/timer.h"
+#include "content/browser/media/capture/content_video_capture_device_core.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_observer.h"
+#include "ui/base/cursor/cursors_aura.h"
+#include "ui/compositor/compositor.h"
+
+namespace cc {
+
+class CopyOutputResult;
+
+}  // namespace cc
+
+namespace content {
+
+class PowerSaveBlocker;
+class ReadbackYUVInterface;
+
+// Provides the VideoCaptureMachine for capturing from an AuraWindow.
+class AuraWindowCaptureMachine
+    : public VideoCaptureMachine,
+      public aura::WindowObserver,
+      public ui::CompositorObserver,
+      public base::SupportsWeakPtr<AuraWindowCaptureMachine> {
+ public:
+  AuraWindowCaptureMachine();
+  ~AuraWindowCaptureMachine() override;
+
+  // VideoCaptureFrameSource overrides.
+  bool Start(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
+             const media::VideoCaptureParams& params) override;
+  void Stop(const base::Closure& callback) override;
+
+  // Implements aura::WindowObserver.
+  void OnWindowBoundsChanged(aura::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+  void OnWindowDestroyed(aura::Window* window) override;
+  void OnWindowAddedToRootWindow(aura::Window* window) override;
+  void OnWindowRemovingFromRootWindow(aura::Window* window,
+                                      aura::Window* new_root) override;
+
+  // Implements ui::CompositorObserver.
+  void OnCompositingDidCommit(ui::Compositor* compositor) override {}
+  void OnCompositingStarted(ui::Compositor* compositor,
+                            base::TimeTicks start_time) override {}
+  void OnCompositingEnded(ui::Compositor* compositor) override;
+  void OnCompositingAborted(ui::Compositor* compositor) override {}
+  void OnCompositingLockStateChanged(ui::Compositor* compositor) override {}
+  void OnCompositingShuttingDown(ui::Compositor* compositor) override {}
+
+  // Sets the window to use for capture.
+  void SetWindow(aura::Window* window);
+
+ private:
+  // Captures a frame.
+  // |dirty| is false for timer polls and true for compositor updates.
+  void Capture(bool dirty);
+
+  // Update capture size. Must be called on the UI thread.
+  void UpdateCaptureSize();
+
+  // Response callback for cc::Layer::RequestCopyOfOutput().
+  void DidCopyOutput(
+      scoped_refptr<media::VideoFrame> video_frame,
+      base::TimeTicks start_time,
+      const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
+      scoped_ptr<cc::CopyOutputResult> result);
+
+  // A helper which does the real work for DidCopyOutput. Returns true if
+  // succeeded.
+  bool ProcessCopyOutputResponse(
+      scoped_refptr<media::VideoFrame> video_frame,
+      base::TimeTicks start_time,
+      const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
+      scoped_ptr<cc::CopyOutputResult> result);
+
+  // Helper function to update cursor state.
+  // |region_in_frame| defines the desktop bound in the captured frame.
+  // Returns the current cursor position in captured frame.
+  gfx::Point UpdateCursorState(const gfx::Rect& region_in_frame);
+
+  // Clears cursor state.
+  void ClearCursorState();
+
+  // The window associated with the desktop.
+  aura::Window* desktop_window_;
+
+  // The timer that kicks off period captures.
+  base::Timer timer_;
+
+  // Whether screen capturing or window capture.
+  bool screen_capture_;
+
+  // Makes all the decisions about which frames to copy, and how.
+  scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
+
+  // The capture parameters for this capture.
+  media::VideoCaptureParams capture_params_;
+
+  // YUV readback pipeline.
+  scoped_ptr<ReadbackYUVInterface> yuv_readback_pipeline_;
+
+  // Cursor state.
+  ui::Cursor last_cursor_;
+  gfx::Point cursor_hot_point_;
+  SkBitmap scaled_cursor_bitmap_;
+
+  // TODO(jiayl): Remove power_save_blocker_ when there is an API to keep the
+  // screen from sleeping for the drive-by web.
+  scoped_ptr<PowerSaveBlocker> power_save_blocker_;
+
+  DISALLOW_COPY_AND_ASSIGN(AuraWindowCaptureMachine);
+};
+
+}  // namespace content