Move DIP translation from ui/aura to ui/compositor

ui/gfx/compositor/dip_util.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 UI_GFX_COMPOSITOR_DIP_UTIL_H_
+#define UI_GFX_COMPOSITOR_DIP_UTIL_H_
+#pragma once
+
+#include "ui/gfx/compositor/compositor_export.h"
+#include "base/basictypes.h"
+
+namespace gfx {
+class Point;
+class Size;
+class Rect;
+}  // namespace gfx
+
+namespace ui {
+namespace test {
+
+class COMPOSITOR_EXPORT ScopedDIPEnablerForTest {

[sky, 2012/05/08 00:41:59]

Add a description. Also, if this is only for testing can you move it into its
own file?

[oshima, 2012/05/08 01:24:16]

This is necessary only for m20 (because I wanted to put DIP behind a flag).
Since I'm going to remove this after m20 branch, I'll keep it here for now.
(If I can't check it in today, i'll just remove them)

+ public:
+  ScopedDIPEnablerForTest();
+  ~ScopedDIPEnablerForTest();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ScopedDIPEnablerForTest);
+};
+
+}  // namespace test
+
+class Layer;
+
+// True if DIP is enabled.
+COMPOSITOR_EXPORT bool IsDIPEnabled();
+
+COMPOSITOR_EXPORT float GetDeviceScaleFactor(const Layer* layer);
+
+// Utility functions that convert point/size/rect between
+// DIP and pixel coordinates system.
+COMPOSITOR_EXPORT gfx::Point ConvertPointToDIP(
+    const Layer* layer,
+    const gfx::Point& point_in_pixel);
+COMPOSITOR_EXPORT gfx::Size ConvertSizeToDIP(
+    const Layer* layer,
+    const gfx::Size& size_in_pixel);
+COMPOSITOR_EXPORT gfx::Rect ConvertRectToDIP(
+    const Layer* layer,
+    const gfx::Rect& rect_in_pixel);
+COMPOSITOR_EXPORT gfx::Point ConvertPointToPixel(
+    const Layer* layer,
+    const gfx::Point& point_in_dip);
+COMPOSITOR_EXPORT gfx::Size ConvertSizeToPixel(
+    const Layer* layer,
+    const gfx::Size& size_in_dip);
+COMPOSITOR_EXPORT gfx::Rect ConvertRectToPixel(
+    const Layer* layer,
+    const gfx::Rect& rect_in_dip);
+
+}  // namespace ui
+
+#endif  // UI_GFX_COMPOSITOR_DIP_UTIL_H_