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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 #include "ui/display/win/dpi.h" | 5 #include "ui/display/win/dpi.h" |
6 | 6 |
7 #include <windows.h> | 7 #include <windows.h> |
8 | 8 |
9 #include "base/win/scoped_hdc.h" | 9 #include "base/win/scoped_hdc.h" |
10 #include "ui/display/display.h" | 10 #include "ui/display/display.h" |
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31 // to all screens. | 31 // to all screens. |
32 dpi_x = GetDeviceCaps(screen_dc, LOGPIXELSX); | 32 dpi_x = GetDeviceCaps(screen_dc, LOGPIXELSX); |
33 dpi_y = GetDeviceCaps(screen_dc, LOGPIXELSY); | 33 dpi_y = GetDeviceCaps(screen_dc, LOGPIXELSY); |
34 } | 34 } |
35 return gfx::Size(dpi_x, dpi_y); | 35 return gfx::Size(dpi_x, dpi_y); |
36 } | 36 } |
37 | 37 |
38 float GetUnforcedDeviceScaleFactor() { | 38 float GetUnforcedDeviceScaleFactor() { |
39 return g_device_scale_factor | 39 return g_device_scale_factor |
40 ? g_device_scale_factor | 40 ? g_device_scale_factor |
41 : static_cast<float>(GetDPI().width()) / kDefaultDPI; | 41 : GetScalingFactorFromDPI(GetDPI().width()); |
42 } | 42 } |
43 | 43 |
44 } // namespace | 44 } // namespace |
45 | 45 |
46 void SetDefaultDeviceScaleFactor(float scale) { | 46 void SetDefaultDeviceScaleFactor(float scale) { |
47 DCHECK_NE(0.f, scale); | 47 DCHECK_NE(0.f, scale); |
48 g_device_scale_factor = scale; | 48 g_device_scale_factor = scale; |
49 } | 49 } |
50 | 50 |
51 float GetDPIScale() { | 51 float GetDPIScale() { |
52 if (display::Display::HasForceDeviceScaleFactor()) | 52 if (display::Display::HasForceDeviceScaleFactor()) |
53 return display::Display::GetForcedDeviceScaleFactor(); | 53 return display::Display::GetForcedDeviceScaleFactor(); |
54 float dpi_scale = GetUnforcedDeviceScaleFactor(); | 54 float dpi_scale = GetUnforcedDeviceScaleFactor(); |
55 return (dpi_scale <= 1.25f) ? 1.f : dpi_scale; | 55 return (dpi_scale <= 1.25f) ? 1.f : dpi_scale; |
56 } | 56 } |
57 | 57 |
58 int GetDPIFromScalingFactor(float device_scaling_factor) { | 58 int GetDPIFromScalingFactor(float device_scaling_factor) { |
59 return kDefaultDPI * device_scaling_factor; | 59 return kDefaultDPI * device_scaling_factor; |
60 } | 60 } |
61 | 61 |
| 62 float GetScalingFactorFromDPI(int dpi) { |
| 63 return static_cast<float>(dpi) / kDefaultDPI; |
| 64 } |
| 65 |
62 int GetSystemMetricsInDIP(int metric) { | 66 int GetSystemMetricsInDIP(int metric) { |
63 // The system metrics always reflect the system DPI, not whatever scale we've | 67 // The system metrics always reflect the system DPI, not whatever scale we've |
64 // forced or decided to use. | 68 // forced or decided to use. |
65 return static_cast<int>( | 69 return static_cast<int>( |
66 std::round(GetSystemMetrics(metric) / GetUnforcedDeviceScaleFactor())); | 70 std::round(GetSystemMetrics(metric) / GetUnforcedDeviceScaleFactor())); |
67 } | 71 } |
68 | 72 |
69 } // namespace win | 73 } // namespace win |
70 } // namespace display | 74 } // namespace display |
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