ui/gfx/win/dpi.h

   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 #ifndef UI_GFX_DPI_WIN_H_
   6 #define UI_GFX_DPI_WIN_H_
   7
   8 #include "ui/gfx/gfx_export.h"
   9 #include "ui/gfx/point.h"
  10 #include "ui/gfx/rect.h"
  11 #include "ui/gfx/size.h"
  12
  13 namespace gfx {
  14
  15 // Initialization of the scale factor that should be applied for rendering
  16 // in this process. Must be called before attempts to call any of the getter
  17 // methods below in this file, e.g. in the early toolkit/resource bundle setup.
  18 // This can be called multiple times during various tests, but subsequent calls
  19 // have no effect.
  20 GFX_EXPORT void InitDeviceScaleFactor(float scale);
  21
  22 GFX_EXPORT Size GetDPI();
  23
  24 // Gets the scale factor of the display. For example, if the display DPI is
  25 // 96 then the scale factor is 1.0.
  26 GFX_EXPORT float GetDPIScale();
  27
  28 // Tests to see if the command line flag "--high-dpi-support" is set.
  29 GFX_EXPORT bool IsHighDPIEnabled();
  30
  31 GFX_EXPORT bool IsInHighDPIMode();
  32
  33 GFX_EXPORT void EnableHighDPISupport();
  34
  35 GFX_EXPORT void ForceHighDPISupportForTesting(float scale);
  36
  37 // TODO(kevers|girard):  Move above methods into win namespace.
  38
  39 namespace win {
  40
  41 GFX_EXPORT float GetDeviceScaleFactor();
  42
  43 GFX_EXPORT Point ScreenToDIPPoint(const Point& pixel_point);
  44
  45 GFX_EXPORT Point DIPToScreenPoint(const Point& dip_point);
  46
  47 GFX_EXPORT Rect ScreenToDIPRect(const Rect& pixel_bounds);
  48
  49 GFX_EXPORT Rect DIPToScreenRect(const Rect& dip_bounds);
  50
  51 GFX_EXPORT Size ScreenToDIPSize(const Size& size_in_pixels);
  52
  53 GFX_EXPORT Size DIPToScreenSize(const Size& dip_size);
  54
  55 // Win32's GetSystemMetrics uses pixel measures. This function calls
  56 // GetSystemMetrics for the given |metric|, then converts the result to DIP.
  57 GFX_EXPORT int GetSystemMetricsInDIP(int metric);
  58
  59 // Returns true if the global device scale factor has been explicitly set for
  60 // the process.
  61 GFX_EXPORT bool IsDeviceScaleFactorSet();
  62
  63 GFX_EXPORT extern const wchar_t kRegistryProfilePath[];
  64 GFX_EXPORT extern const wchar_t kHighDPISupportW[];
  65
  66 }  // namespace win
  67 }  // namespace gfx
  68
  69 #endif  // UI_GFX_DPI_WIN_H_