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
13namespace 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.
20GFX_EXPORT void InitDeviceScaleFactor(float scale);
21
22GFX_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.
26GFX_EXPORT float GetDPIScale();
27
28// Tests to see if the command line flag "--high-dpi-support" is set.
29GFX_EXPORT bool IsHighDPIEnabled();
30
31GFX_EXPORT bool IsInHighDPIMode();
32
33GFX_EXPORT void EnableHighDPISupport();
34
35GFX_EXPORT void ForceHighDPISupportForTesting(float scale);
36
37// TODO(kevers|girard):  Move above methods into win namespace.
38
39namespace win {
40
41GFX_EXPORT float GetDeviceScaleFactor();
42
43GFX_EXPORT Point ScreenToDIPPoint(const Point& pixel_point);
44
45GFX_EXPORT Point DIPToScreenPoint(const Point& dip_point);
46
47// WARNING: there is no right way to scale sizes and rects. The implementation
48// of these strives to maintain a constant size by scaling the size independent
49// of the origin. An alternative is to get the enclosing rect, which is the
50// right way for some situations. Understand which you need before blindly
51// assuming this is the right way.
52GFX_EXPORT Rect ScreenToDIPRect(const Rect& pixel_bounds);
53GFX_EXPORT Rect DIPToScreenRect(const Rect& dip_bounds);
54GFX_EXPORT Size ScreenToDIPSize(const Size& size_in_pixels);
55GFX_EXPORT Size DIPToScreenSize(const Size& dip_size);
56
57// Win32's GetSystemMetrics uses pixel measures. This function calls
58// GetSystemMetrics for the given |metric|, then converts the result to DIP.
59GFX_EXPORT int GetSystemMetricsInDIP(int metric);
60
61// Returns true if the global device scale factor has been explicitly set for
62// the process.
63GFX_EXPORT bool IsDeviceScaleFactorSet();
64
65GFX_EXPORT extern const wchar_t kRegistryProfilePath[];
66GFX_EXPORT extern const wchar_t kHighDPISupportW[];
67
68}  // namespace win
69}  // namespace gfx
70
71#endif  // UI_GFX_DPI_WIN_H_
72