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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_DPI_WIN_H_ | 5 #ifndef UI_GFX_DPI_WIN_H_ |
6 #define UI_GFX_DPI_WIN_H_ | 6 #define UI_GFX_DPI_WIN_H_ |
7 | 7 |
8 #include "ui/gfx/geometry/point.h" | 8 #include "ui/gfx/geometry/point.h" |
9 #include "ui/gfx/geometry/rect.h" | 9 #include "ui/gfx/geometry/rect.h" |
10 #include "ui/gfx/geometry/size.h" | 10 #include "ui/gfx/geometry/size.h" |
11 #include "ui/gfx/gfx_export.h" | 11 #include "ui/gfx/gfx_export.h" |
| 12 #include "ui/gfx/native_widget_types.h" |
12 | 13 |
13 namespace gfx { | 14 namespace gfx { |
14 | 15 |
15 // Initialization of the scale factor that should be applied for rendering | 16 // 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 // 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 // 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 // This can be called multiple times during various tests, but subsequent calls |
19 // have no effect. | 20 // have no effect. |
20 GFX_EXPORT void InitDeviceScaleFactor(float scale); | 21 GFX_EXPORT void InitDeviceScaleFactor(float scale); |
21 | 22 |
22 GFX_EXPORT Size GetDPI(); | 23 GFX_EXPORT int GetDPIFromScalingFactor(float device_scaling_factor); |
23 | 24 |
24 // Gets the scale factor of the display. For example, if the display DPI is | 25 // Gets the scale factor of the display. For example, if the display DPI is |
25 // 96 then the scale factor is 1.0. | 26 // 96 then the scale factor is 1.0. |
26 GFX_EXPORT float GetDPIScale(); | 27 GFX_EXPORT float GetDPIScale(); |
27 | 28 |
28 namespace win { | 29 namespace win { |
29 | 30 |
30 GFX_EXPORT Point ScreenToDIPPoint(const Point& pixel_point); | |
31 | |
32 GFX_EXPORT Point DIPToScreenPoint(const Point& dip_point); | |
33 | |
34 // WARNING: there is no right way to scale sizes and rects. The implementation | |
35 // of these strives to maintain a constant size by scaling the size independent | |
36 // of the origin. An alternative is to get the enclosing rect, which is the | |
37 // right way for some situations. Understand which you need before blindly | |
38 // assuming this is the right way. | |
39 GFX_EXPORT Rect ScreenToDIPRect(const Rect& pixel_bounds); | |
40 GFX_EXPORT Rect DIPToScreenRect(const Rect& dip_bounds); | |
41 GFX_EXPORT Size ScreenToDIPSize(const Size& size_in_pixels); | |
42 GFX_EXPORT Size DIPToScreenSize(const Size& dip_size); | |
43 | |
44 // Win32's GetSystemMetrics uses pixel measures. This function calls | 31 // Win32's GetSystemMetrics uses pixel measures. This function calls |
45 // GetSystemMetrics for the given |metric|, then converts the result to DIP. | 32 // GetSystemMetrics for the given |metric|, then converts the result to DIP. |
46 GFX_EXPORT int GetSystemMetricsInDIP(int metric); | 33 GFX_EXPORT int GetSystemMetricsInDIP(int metric); |
47 | 34 |
48 } // namespace win | 35 } // namespace win |
49 } // namespace gfx | 36 } // namespace gfx |
50 | 37 |
51 #endif // UI_GFX_DPI_WIN_H_ | 38 #endif // UI_GFX_DPI_WIN_H_ |
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