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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 #include "ui/base/win/dpi.h" | 5 #include "ui/base/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 "base/win/registry.h" | |
11 #include "ui/gfx/display.h" | 10 #include "ui/gfx/display.h" |
12 #include "ui/gfx/point_conversions.h" | 11 #include "ui/gfx/point_conversions.h" |
13 #include "ui/gfx/rect_conversions.h" | 12 #include "ui/gfx/rect_conversions.h" |
14 #include "ui/gfx/size_conversions.h" | 13 #include "ui/gfx/size_conversions.h" |
15 | 14 |
16 namespace { | 15 namespace { |
17 | 16 |
18 int kDefaultDPIX = 96; | 17 int kDefaultDPIX = 96; |
19 int kDefaultDPIY = 96; | 18 int kDefaultDPIY = 96; |
20 | 19 |
21 | 20 |
22 float GetDeviceScaleFactorImpl() { | 21 float GetDeviceScaleFactorImpl() { |
23 #if defined(ENABLE_HIDPI) | 22 #if defined(ENABLE_HIDPI) |
24 return gfx::Display::HasForceDeviceScaleFactor() ? | 23 return gfx::Display::HasForceDeviceScaleFactor() ? |
25 gfx::Display::GetForcedDeviceScaleFactor() : ui::GetDPIScale(); | 24 gfx::Display::GetForcedDeviceScaleFactor() : ui::GetDPIScale(); |
26 #else | 25 #else |
27 return 1.0f; | 26 return 1.0f; |
28 #endif | 27 #endif |
29 } | 28 } |
30 | 29 |
31 BOOL IsProcessDPIAwareWrapper() { | |
32 typedef BOOL(WINAPI *IsProcessDPIAwarePtr)(VOID); | |
33 IsProcessDPIAwarePtr is_process_dpi_aware_func = | |
34 reinterpret_cast<IsProcessDPIAwarePtr>( | |
35 GetProcAddress(GetModuleHandleA("user32.dll"), "IsProcessDPIAware")); | |
36 if (is_process_dpi_aware_func) | |
37 return is_process_dpi_aware_func(); | |
38 return FALSE; | |
39 } | |
40 | |
41 } // namespace | 30 } // namespace |
42 | 31 |
43 namespace ui { | 32 namespace ui { |
44 | 33 |
45 gfx::Size GetDPI() { | 34 gfx::Size GetDPI() { |
46 static int dpi_x = 0; | 35 static int dpi_x = 0; |
47 static int dpi_y = 0; | 36 static int dpi_y = 0; |
48 static bool should_initialize = true; | 37 static bool should_initialize = true; |
49 | 38 |
50 if (should_initialize) { | 39 if (should_initialize) { |
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104 | 93 |
105 gfx::Size ScreenToDIPSize(const gfx::Size& size_in_pixels) { | 94 gfx::Size ScreenToDIPSize(const gfx::Size& size_in_pixels) { |
106 return gfx::ToFlooredSize( | 95 return gfx::ToFlooredSize( |
107 gfx::ScaleSize(size_in_pixels, 1.0f / GetDeviceScaleFactor())); | 96 gfx::ScaleSize(size_in_pixels, 1.0f / GetDeviceScaleFactor())); |
108 } | 97 } |
109 | 98 |
110 gfx::Size DIPToScreenSize(const gfx::Size& dip_size) { | 99 gfx::Size DIPToScreenSize(const gfx::Size& dip_size) { |
111 return gfx::ToFlooredSize(gfx::ScaleSize(dip_size, GetDeviceScaleFactor())); | 100 return gfx::ToFlooredSize(gfx::ScaleSize(dip_size, GetDeviceScaleFactor())); |
112 } | 101 } |
113 | 102 |
114 double GetDPIScaleFromRegistry() { | |
115 static double scale = -1.0; | |
116 if (scale == -1.0) { | |
117 double result = 1.0; | |
118 if (!IsProcessDPIAwareWrapper()) { | |
119 //HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics\AppliedDPI | |
120 base::win::RegKey key(HKEY_CURRENT_USER, | |
121 L"Control Panel\\Desktop\\WindowMetrics", | |
122 KEY_QUERY_VALUE); | |
123 | |
124 if (key.Valid()) { | |
125 DWORD value = 0; | |
126 if (key.ReadValueDW(L"AppliedDPI", &value) == ERROR_SUCCESS) { | |
127 result = ((double)value) / kDefaultDPIX; | |
128 } | |
129 } | |
130 } | |
131 scale = result; | |
132 } | |
133 return scale; | |
134 } | |
135 | |
136 } // namespace win | 103 } // namespace win |
137 | 104 |
138 } // namespace ui | 105 } // namespace ui |
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