text: // Copyright 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_DISPLAY_WIN_DPI_H_
  #define UI_DISPLAY_WIN_DPI_H_
  
  #include "ui/display/display_export.h"
  #include "ui/gfx/geometry/size.h"
  
  namespace display {
  namespace win {
  
  // Sets the device scale factor that will be used unless overridden on the
  // command line by --force-device-scale-factor.  If this is not called, and that
  // flag is not used, the scale factor used by the DIP conversion functions below
  // will be that returned by GetDPIScale().
  DISPLAY_EXPORT void SetDefaultDeviceScaleFactor(float scale);
  
  // Gets the scale factor of the display. For example, if the display DPI is
  // 96 then the scale factor is 1.0.  This clamps scale factors <= 1.25 to 1.0 to
  // maintain previous (non-DPI-aware) behavior where only the font size was
  // boosted.
  DISPLAY_EXPORT float GetDPIScale();
  
  // Returns the equivalent DPI for |device_scaling_factor|.
  DISPLAY_EXPORT int GetDPIFromScalingFactor(float device_scaling_factor);
  
  // Win32's GetSystemMetrics uses pixel measures. This function calls
  // GetSystemMetrics for the given |metric|, then converts the result to DIP.
  DISPLAY_EXPORT int GetSystemMetricsInDIP(int metric);
  
  }  // namespace win
  }  // namespace display
  
  #endif  // UI_DISPLAY_WIN_DPI_H_
  