cast: support cursor rendering for tab capture

content/browser/media/capture/cursor_renderer_aura.h

+// Copyright (c) 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_MEDIA_CAPTURE_CURSOR_RENDERER_AURA_H_
+#define CONTENT_BROWSER_MEDIA_CAPTURE_CURSOR_RENDERER_AURA_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time/default_tick_clock.h"
+#include "base/time/tick_clock.h"
+#include "content/browser/media/capture/cursor_renderer.h"
+#include "content/common/content_export.h"
+#include "media/base/video_frame.h"
+#include "skia/ext/image_operations.h"
+#include "ui/aura/window.h"
+#include "ui/base/cursor/cursor.h"
+#include "ui/events/event_handler.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace content {
+
+// Tracks state for making decisions on cursor display on a captured video
+// frame.
+class CONTENT_EXPORT CursorRendererAura : public CursorRenderer,
+                                          public ui::EventHandler,
+                                          public aura::WindowObserver {
+ public:
+  explicit CursorRendererAura(gfx::NativeWindow window);

[miu, 2015/10/29 01:44:49]

nit: Since this is Aura-specific code, let's use aura::Window* instead of
gfx::NativeWindow as the type here (and for the data member on line 52).

[Irfan, 2015/10/29 15:34:19]

Done.

+  ~CursorRendererAura() final;
+
+  // CursorRender implementation.
+  void Clear() final;
+  bool SnapshotCursorState(const gfx::Rect& region_in_frame) final;
+  void RenderOnVideoFrame(
+      const scoped_refptr<media::VideoFrame>& target) const final;
+  base::WeakPtr<CursorRenderer> GetWeakPtr() final;
+
+  // ui::EventHandler overrides.
+  void OnMouseEvent(ui::MouseEvent* event) final;
+
+  // aura::WindowObserver overrides.
+  void OnWindowDestroying(aura::Window* window) final;
+
+ private:
+  friend class CursorRendererAuraTest;
+
+  gfx::NativeView window_;
+
+  // Snapshot of cursor, source size, position, and cursor bitmap; as of the
+  // last call to SnapshotCursorState.
+  ui::Cursor last_cursor_;
+  gfx::Size window_size_when_cursor_last_updated_;
+  gfx::Point cursor_position_in_frame_;
+  SkBitmap scaled_cursor_bitmap_;
+
+  // Updated in mouse event listener and used to make a decision on
+  // when the cursor is rendered.
+  base::TimeDelta last_mouse_movement_timestamp_;
+  float last_mouse_position_x_;
+  float last_mouse_position_y_;
+  bool cursor_displayed_;
+
+  // Allows tests to replace the clock.
+  base::DefaultTickClock default_tick_clock_;
+  base::TickClock* tick_clock_;
+
+  base::WeakPtrFactory<CursorRendererAura> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(CursorRendererAura);

[miu, 2015/10/29 01:44:49]

nit: Add a blank line above this one.

[Irfan, 2015/10/29 15:34:19]

Done.

+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_CURSOR_RENDERER_AURA_H_