Full-screen Magnifier: Support warping the cursor on the edge

ash/magnifier/magnified_cursor.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 ASH_MAGNIFIER_MAGNIFIED_CURSOR_H_
+#define ASH_MAGNIFIER_MAGNIFIED_CURSOR_H_
+#pragma once
+
+#include "ui/compositor/layer_delegate.h"
+#include "ui/compositor/layer.h"
+#include "ui/gfx/image/image.h"
+#include "ui/gfx/canvas.h"
+
+namespace aura {
+class RootWindow;
+}
+
+namespace ash {
+namespace internal {
+
+class MagnifiedCursor : public ui::LayerDelegate {
+ public:
+  explicit MagnifiedCursor(aura::RootWindow* root_window);
+  virtual ~MagnifiedCursor() {}
+
+  ui::Layer* layer() { return layer_.get(); }
+  void MovePointer(gfx::Point position);
+  void SetVisible(bool show);
+
+  // ui::LayerDelegate implementation:
+  virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
+
+ private:
+  scoped_ptr<ui::Layer> layer_;
+  aura::RootWindow* root_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(MagnifiedCursor);
+};
+
+}
+}
+
+#endif  // ASH_MAGNIFIER_MAGNIFIED_CURSOR_H_