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| 1 // Copyright 2016 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 #include "ui/gfx/win/physical_size.h" |
| 6 |
| 7 #include <windows.h> |
| 8 #include <setupapi.h> |
| 9 |
| 10 #include <iostream> |
| 11 |
| 12 #include "base/logging.h" |
| 13 #include "base/memory/scoped_ptr.h" |
| 14 #include "base/scoped_generic.h" |
| 15 #include "base/strings/utf_string_conversions.h" |
| 16 #include "base/win/registry.h" |
| 17 |
| 18 // This GUID {E6F07B5F-EE97-4A90-B076-33F57BF4EAA7} was taken from |
| 19 // https://msdn.microsoft.com/en-us/library/windows/hardware/ff545901.aspx |
| 20 const GUID GUID_DEVICEINTERFACE_MONITOR = { |
| 21 0xE6F07B5F, |
| 22 0xEE97, |
| 23 0x4A90, |
| 24 {0xB0, 0x76, 0x33, 0xF5, 0x7B, 0xF4, 0xEA, 0xA7}}; |
| 25 |
| 26 namespace { |
| 27 |
| 28 struct DeviceInfoListScopedTraits { |
| 29 static HDEVINFO InvalidValue() { return INVALID_HANDLE_VALUE; } |
| 30 |
| 31 static void Free(HDEVINFO h) { SetupDiDestroyDeviceInfoList(h); } |
| 32 }; |
| 33 |
| 34 bool GetSizeFromRegistry(HDEVINFO device_info_list, |
| 35 SP_DEVINFO_DATA* device_info, |
| 36 int* width_mm, |
| 37 int* height_mm) { |
| 38 base::win::RegKey reg_key(SetupDiOpenDevRegKey( |
| 39 device_info_list, device_info, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_READ)); |
| 40 if (!reg_key.Valid()) |
| 41 return false; |
| 42 |
| 43 BYTE data[128]; // EDID block is exactly 128 bytes long. |
| 44 ZeroMemory(&data[0], sizeof(data)); |
| 45 DWORD data_length = sizeof(data); |
| 46 LONG return_value = |
| 47 reg_key.ReadValue(L"EDID", &data[0], &data_length, nullptr); |
| 48 if (return_value != ERROR_SUCCESS) |
| 49 return false; |
| 50 |
| 51 // Byte 54 is the start of the first descriptor block, which contains the |
| 52 // required timing information with the highest preference, and 12 bytes |
| 53 // into that block is the size information. |
| 54 // 66: width least significant bits |
| 55 // 67: height least significant bits |
| 56 // 68: 4 bits for each of width and height most significant bits |
| 57 if (data[54] == 0) |
| 58 return false; |
| 59 const int w = ((data[68] & 0xF0) << 4) + data[66]; |
| 60 const int h = ((data[68] & 0x0F) << 8) + data[67]; |
| 61 |
| 62 if (w <= 0 || h <= 0) |
| 63 return false; |
| 64 |
| 65 *width_mm = w; |
| 66 *height_mm = h; |
| 67 |
| 68 return true; |
| 69 } |
| 70 |
| 71 bool GetInterfaceDetailAndDeviceInfo( |
| 72 HDEVINFO device_info_list, |
| 73 SP_DEVICE_INTERFACE_DATA* interface_data, |
| 74 scoped_ptr<SP_DEVICE_INTERFACE_DETAIL_DATA, base::FreeDeleter>* |
| 75 interface_detail, |
| 76 SP_DEVINFO_DATA* device_info) { |
| 77 DCHECK_EQ(sizeof(*device_info), device_info->cbSize); |
| 78 DWORD buffer_size; |
| 79 // This call populates device_info. It will also fail, but if the error is |
| 80 // "insufficient buffer" then it will set buffer_size and we can call again |
| 81 // with an allocated buffer. |
| 82 SetupDiGetDeviceInterfaceDetail(device_info_list, interface_data, nullptr, 0, |
| 83 &buffer_size, device_info); |
| 84 if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) |
| 85 return false; |
| 86 |
| 87 interface_detail->reset( |
| 88 reinterpret_cast<SP_DEVICE_INTERFACE_DETAIL_DATA*>(malloc(buffer_size))); |
| 89 (*interface_detail)->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA); |
| 90 return SetupDiGetDeviceInterfaceDetail(device_info_list, interface_data, |
| 91 interface_detail->get(), buffer_size, |
| 92 nullptr, nullptr) != 0; |
| 93 } |
| 94 |
| 95 } // namespace |
| 96 |
| 97 namespace gfx { |
| 98 |
| 99 // The physical size information is only available by looking in the EDID block |
| 100 // via setup. However setup has the device path and not the device name that we |
| 101 // use to identify displays. Therefore after looking up a device via setup we |
| 102 // need to find the display again via EnumDisplayDevices (matching device path |
| 103 // to the device ID of the display's interface) so we can return the device name |
| 104 // (available from the interface's attached monitor). |
| 105 std::vector<PhysicalDisplaySize> GetPhysicalSizeForDisplays() { |
| 106 std::vector<PhysicalDisplaySize> out; |
| 107 |
| 108 base::ScopedGeneric<HDEVINFO, DeviceInfoListScopedTraits> device_info_list( |
| 109 SetupDiGetClassDevs(&GUID_DEVICEINTERFACE_MONITOR, nullptr, nullptr, |
| 110 DIGCF_PRESENT | DIGCF_DEVICEINTERFACE)); |
| 111 |
| 112 if (!device_info_list.is_valid()) |
| 113 return out; |
| 114 |
| 115 SP_DEVICE_INTERFACE_DATA interface_data = {}; |
| 116 interface_data.cbSize = sizeof(interface_data); |
| 117 int interface_index = 0; |
| 118 while (SetupDiEnumDeviceInterfaces(device_info_list.get(), nullptr, |
| 119 &GUID_DEVICEINTERFACE_MONITOR, |
| 120 interface_index++, &interface_data)) { |
| 121 scoped_ptr<SP_DEVICE_INTERFACE_DETAIL_DATA, base::FreeDeleter> |
| 122 interface_detail; |
| 123 SP_DEVINFO_DATA device_info = {}; |
| 124 device_info.cbSize = sizeof(device_info); |
| 125 bool get_info_succeeded = |
| 126 GetInterfaceDetailAndDeviceInfo(device_info_list.get(), &interface_data, |
| 127 &interface_detail, &device_info); |
| 128 if (!get_info_succeeded) |
| 129 continue; |
| 130 |
| 131 DISPLAY_DEVICE display_device = {}; |
| 132 display_device.cb = sizeof(display_device); |
| 133 int display_index = 0; |
| 134 while (EnumDisplayDevices(nullptr, display_index++, &display_device, |
| 135 EDD_GET_DEVICE_INTERFACE_NAME)) { |
| 136 DISPLAY_DEVICE attached_device = {}; |
| 137 attached_device.cb = sizeof(attached_device); |
| 138 int attached_index = 0; |
| 139 while (EnumDisplayDevices(display_device.DeviceName, attached_index++, |
| 140 &attached_device, |
| 141 EDD_GET_DEVICE_INTERFACE_NAME)) { |
| 142 wchar_t* attached_device_id = attached_device.DeviceID; |
| 143 wchar_t* setup_device_path = interface_detail->DevicePath; |
| 144 if (wcsicmp(attached_device_id, setup_device_path) == 0) { |
| 145 int width_mm; |
| 146 int height_mm; |
| 147 bool found = GetSizeFromRegistry(device_info_list.get(), &device_info, |
| 148 &width_mm, &height_mm); |
| 149 if (found) { |
| 150 out.push_back( |
| 151 PhysicalDisplaySize(base::WideToUTF8(display_device.DeviceName), |
| 152 width_mm, height_mm)); |
| 153 } |
| 154 break; |
| 155 } |
| 156 } |
| 157 } |
| 158 } |
| 159 return out; |
| 160 } |
| 161 |
| 162 } // namespace gfx |
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