ui/base/layout_mac.mm

   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
  11 namespace {
  12
  13 float 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
  32 namespace ui {
  33
  34 ScaleFactor GetScaleFactorForNativeView(gfx::NativeView view) {
  35   return GetSupportedScaleFactor(GetScaleFactorScaleForNativeView(view));
  36 }
  37
  38 }  // namespace ui