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

ash/magnifier/magnified_cursor.cc

+// 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.
+
+#include "ash/magnifier/magnified_cursor.h"
+
+#include "ui/aura/root_window.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "grit/ui_resources.h"
+
+namespace ash {
+namespace internal {
+
+MagnifiedCursor::MagnifiedCursor(aura::RootWindow* root_window)
+    : root_window_(root_window) {
+  layer_.reset(new ui::Layer(ui::LAYER_TEXTURED));
+  layer_->set_delegate(this);
+  layer_->SetVisible(false);
+}
+
+void MagnifiedCursor::SetVisible(bool show) {
+  layer_->SetVisible(show);
+}
+
+void MagnifiedCursor::MovePointer(gfx::Point position) {
+  gfx::Rect rect(position.x() - 5, position.y() -5 , 10, 10);
+  layer_->SetBounds(rect);
+}
+
+// ui::LayerDelegate implementation:
+void MagnifiedCursor::OnPaintLayer(gfx::Canvas* canvas) {
+  // TODO(yoshiki): Draw a magnified cursor.
+}
+
+}
+}