Use the source display's pixel size as a mirror window's size.

ash/ash_root_window_transformer.h

-// Copyright (c) 2013 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_ASH_ROOT_WINDOW_TRANSFORMER_H_
-#define ASH_ASH_ROOT_WINDOW_TRANSFORMER_H_
-
-#include "ash/ash_export.h"
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/aura/root_window_transformer.h"
-#include "ui/gfx/insets.h"
-#include "ui/gfx/transform.h"
-
-namespace aura {
-class RootWindow;
-}
-
-namespace gfx {
-class Display;
-}
-
-namespace ash {
-
-// RootWindowTransformer for ash environment.
-class ASH_EXPORT AshRootWindowTransformer : public aura::RootWindowTransformer {
- public:
-  AshRootWindowTransformer(aura::RootWindow* root,
-                           const gfx::Display& display);
-  // aura::RootWindowTransformer overrides:
-  virtual gfx::Transform GetTransform() const OVERRIDE;
-  virtual gfx::Transform GetInverseTransform() const OVERRIDE;
-  virtual gfx::Rect GetRootWindowBounds(
-      const gfx::Size& host_size) const OVERRIDE;
-  virtual gfx::Insets GetHostInsets() const OVERRIDE;
-
- private:
-  virtual ~AshRootWindowTransformer();
-
-  aura::RootWindow* root_window_;
-  gfx::Transform transform_;
-
-  // The accurate representation of the inverse of the |transform_|.
-  // This is used to avoid computation error caused by
-  // |gfx::Transform::GetInverse|.
-  gfx::Transform invert_transform_;
-
-  // The transform of the root window bounds. This is used to calculate
-  // the size of root window.
-  gfx::Transform root_window_bounds_transform_;
-
-  // The scale of the root window. This is used to expand the
-  // area of the root window (useful in HighDPI display).
-  // Note that this should not be confused with the device scale
-  // factor, which specfies the pixel density of the display.
-  float root_window_ui_scale_;
-
-  gfx::Insets host_insets_;
-
-  DISALLOW_COPY_AND_ASSIGN(AshRootWindowTransformer);
-};
-
-}  // namespace ash
-
-#endif  // ASH_ASH_ROOT_WINDOW_TRANSFORMER_H_