text: // 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_DPI_WIN_H_
  #define UI_GFX_DPI_WIN_H_
  
  #include "ui/gfx/geometry/point.h"
  #include "ui/gfx/geometry/rect.h"
  #include "ui/gfx/geometry/size.h"
  #include "ui/gfx/gfx_export.h"
  
  namespace gfx {
  
  // 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().
  GFX_EXPORT void SetDefaultDeviceScaleFactor(float scale);
  
  GFX_EXPORT Size GetDPI();
  
  // 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.
  GFX_EXPORT float GetDPIScale();
  
  namespace win {
  
  GFX_EXPORT Point ScreenToDIPPoint(const Point& pixel_point);
  
  GFX_EXPORT Point DIPToScreenPoint(const Point& dip_point);
  
  // WARNING: there is no right way to scale sizes and rects. The implementation
  // of these strives to maintain a constant size by scaling the size independent
  // of the origin. An alternative is to get the enclosing rect, which is the
  // right way for some situations. Understand which you need before blindly
  // assuming this is the right way.
  GFX_EXPORT Rect ScreenToDIPRect(const Rect& pixel_bounds);
  GFX_EXPORT Rect DIPToScreenRect(const Rect& dip_bounds);
  GFX_EXPORT Size ScreenToDIPSize(const Size& size_in_pixels);
  GFX_EXPORT Size DIPToScreenSize(const Size& dip_size);
  
  // Win32's GetSystemMetrics uses pixel measures. This function calls
  // GetSystemMetrics for the given |metric|, then converts the result to DIP.
  GFX_EXPORT int GetSystemMetricsInDIP(int metric);
  
  }  // namespace win
  }  // namespace gfx
  
  #endif  // UI_GFX_DPI_WIN_H_
  