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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 // 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. | |
52 GFX_EXPORT Rect ScreenToDIPRect(const Rect& pixel_bounds); | |
53 GFX_EXPORT Rect DIPToScreenRect(const Rect& dip_bounds); | |
54 GFX_EXPORT Size ScreenToDIPSize(const Size& size_in_pixels); | |
55 GFX_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. | |
59 GFX_EXPORT int GetSystemMetricsInDIP(int metric); | |
60 | |
61 // Returns true if the global device scale factor has been explicitly set for | |
62 // the process. | |
63 GFX_EXPORT bool IsDeviceScaleFactorSet(); | |
64 | |
65 GFX_EXPORT extern const wchar_t kRegistryProfilePath[]; | |
66 GFX_EXPORT extern const wchar_t kHighDPISupportW[]; | |
67 | |
68 } // namespace win | |
69 } // namespace gfx | |
70 | |
71 #endif // UI_GFX_DPI_WIN_H_ | |
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