1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/base/layout.h"
6
7#include <Cocoa/Cocoa.h>
8
9#include "base/mac/sdk_forward_declarations.h"
10
11namespace {
12
13float GetScaleFactorScaleForNativeView(gfx::NativeView view) {
14  if (NSWindow* window = [view window]) {
15    if ([window respondsToSelector:@selector(backingScaleFactor)])
16      return [window backingScaleFactor];
17    return [window userSpaceScaleFactor];
18  }
19
20  NSArray* screens = [NSScreen screens];
21  if (![screens count])
22    return 1.0f;
23
24  NSScreen* screen = [screens objectAtIndex:0];
25  if ([screen respondsToSelector:@selector(backingScaleFactor)])
26    return [screen backingScaleFactor];
27  return [screen userSpaceScaleFactor];
28}
29
30}  // namespace
31
32namespace ui {
33
34float GetScaleFactorForNativeView(gfx::NativeView view) {
35  return GetScaleFactorScaleForNativeView(view);
36}
37
38}  // namespace ui
39