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1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 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_DISPLAY_WIN_DPI_H_ | 5 #ifndef UI_DISPLAY_WIN_DPI_H_ |
6 #define UI_DISPLAY_WIN_DPI_H_ | 6 #define UI_DISPLAY_WIN_DPI_H_ |
7 | 7 |
8 #include "ui/display/display_export.h" | 8 #include "ui/display/display_export.h" |
9 #include "ui/gfx/geometry/size.h" | 9 #include "ui/gfx/geometry/size.h" |
10 | 10 |
11 namespace display { | 11 namespace display { |
12 namespace win { | 12 namespace win { |
13 | 13 |
14 // Sets the device scale factor that will be used unless overridden on the | 14 // Sets the device scale factor that will be used unless overridden on the |
15 // command line by --force-device-scale-factor. If this is not called, and that | 15 // command line by --force-device-scale-factor. If this is not called, and that |
16 // flag is not used, the scale factor used by the DIP conversion functions below | 16 // flag is not used, the scale factor used by the DIP conversion functions below |
17 // will be that returned by GetDPIScale(). | 17 // will be that returned by GetDPIScale(). |
18 DISPLAY_EXPORT void SetDefaultDeviceScaleFactor(float scale); | 18 DISPLAY_EXPORT void SetDefaultDeviceScaleFactor(float scale); |
19 | 19 |
20 // Gets the scale factor of the display. For example, if the display DPI is | 20 // Gets the scale factor of the display. For example, if the display DPI is |
21 // 96 then the scale factor is 1.0. This clamps scale factors <= 1.25 to 1.0 to | 21 // 96 then the scale factor is 1.0. This clamps scale factors <= 1.25 to 1.0 to |
22 // maintain previous (non-DPI-aware) behavior where only the font size was | 22 // maintain previous (non-DPI-aware) behavior where only the font size was |
23 // boosted. | 23 // boosted. |
24 DISPLAY_EXPORT float GetDPIScale(); | 24 DISPLAY_EXPORT float GetDPIScale(); |
25 | 25 |
26 // Returns the equivalent DPI for |device_scaling_factor|. | 26 // Returns the equivalent DPI for |device_scaling_factor|. |
27 DISPLAY_EXPORT int GetDPIFromScalingFactor(float device_scaling_factor); | 27 DISPLAY_EXPORT int GetDPIFromScalingFactor(float device_scaling_factor); |
28 | 28 |
| 29 // Returns the equivalent scaling factor for |dpi|. |
| 30 DISPLAY_EXPORT float GetScalingFactorFromDPI(int dpi); |
| 31 |
29 // Win32's GetSystemMetrics uses pixel measures. This function calls | 32 // Win32's GetSystemMetrics uses pixel measures. This function calls |
30 // GetSystemMetrics for the given |metric|, then converts the result to DIP. | 33 // GetSystemMetrics for the given |metric|, then converts the result to DIP. |
31 DISPLAY_EXPORT int GetSystemMetricsInDIP(int metric); | 34 DISPLAY_EXPORT int GetSystemMetricsInDIP(int metric); |
32 | 35 |
33 } // namespace win | 36 } // namespace win |
34 } // namespace display | 37 } // namespace display |
35 | 38 |
36 #endif // UI_DISPLAY_WIN_DPI_H_ | 39 #endif // UI_DISPLAY_WIN_DPI_H_ |
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