Index: ui/gfx/win/physical_size.cc |
diff --git a/ui/gfx/win/physical_size.cc b/ui/gfx/win/physical_size.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..cc1fc144529672cd63c0fd611f8ec84854a5bcf6 |
--- /dev/null |
+++ b/ui/gfx/win/physical_size.cc |
@@ -0,0 +1,162 @@ |
+// Copyright 2016 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "ui/gfx/win/physical_size.h" |
+ |
+#include <windows.h> |
+#include <setupapi.h> |
+ |
+#include <iostream> |
+ |
+#include "base/logging.h" |
+#include "base/memory/scoped_ptr.h" |
+#include "base/scoped_generic.h" |
+#include "base/strings/utf_string_conversions.h" |
+#include "base/win/registry.h" |
+ |
+// This GUID {E6F07B5F-EE97-4A90-B076-33F57BF4EAA7} was taken from |
+// https://msdn.microsoft.com/en-us/library/windows/hardware/ff545901.aspx |
+const GUID GUID_DEVICEINTERFACE_MONITOR = { |
+ 0xE6F07B5F, |
+ 0xEE97, |
+ 0x4A90, |
+ {0xB0, 0x76, 0x33, 0xF5, 0x7B, 0xF4, 0xEA, 0xA7}}; |
+ |
+namespace { |
+ |
+struct DeviceInfoListScopedTraits { |
+ static HDEVINFO InvalidValue() { return INVALID_HANDLE_VALUE; } |
+ |
+ static void Free(HDEVINFO h) { SetupDiDestroyDeviceInfoList(h); } |
+}; |
+ |
+bool GetSizeFromRegistry(HDEVINFO device_info_list, |
+ SP_DEVINFO_DATA* device_info, |
+ int* width_mm, |
+ int* height_mm) { |
+ base::win::RegKey reg_key(SetupDiOpenDevRegKey( |
+ device_info_list, device_info, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_READ)); |
+ if (!reg_key.Valid()) |
+ return false; |
+ |
+ BYTE data[128]; // EDID block is exactly 128 bytes long. |
+ ZeroMemory(&data[0], sizeof(data)); |
+ DWORD data_length = sizeof(data); |
+ LONG return_value = |
+ reg_key.ReadValue(L"EDID", &data[0], &data_length, nullptr); |
+ if (return_value != ERROR_SUCCESS) |
+ return false; |
+ |
+ // Byte 54 is the start of the first descriptor block, which contains the |
+ // required timing information with the highest preference, and 12 bytes |
+ // into that block is the size information. |
+ // 66: width least significant bits |
+ // 67: height least significant bits |
+ // 68: 4 bits for each of width and height most significant bits |
+ if (data[54] == 0) |
+ return false; |
+ const int w = ((data[68] & 0xF0) << 4) + data[66]; |
+ const int h = ((data[68] & 0x0F) << 8) + data[67]; |
+ |
+ if (w <= 0 || h <= 0) |
+ return false; |
+ |
+ *width_mm = w; |
+ *height_mm = h; |
+ |
+ return true; |
+} |
+ |
+bool GetInterfaceDetailAndDeviceInfo( |
+ HDEVINFO device_info_list, |
+ SP_DEVICE_INTERFACE_DATA* interface_data, |
+ scoped_ptr<SP_DEVICE_INTERFACE_DETAIL_DATA, base::FreeDeleter>* |
+ interface_detail, |
+ SP_DEVINFO_DATA* device_info) { |
+ DCHECK_EQ(sizeof(*device_info), device_info->cbSize); |
+ DWORD buffer_size; |
+ // This call populates device_info. It will also fail, but if the error is |
+ // "insufficient buffer" then it will set buffer_size and we can call again |
+ // with an allocated buffer. |
+ SetupDiGetDeviceInterfaceDetail(device_info_list, interface_data, nullptr, 0, |
+ &buffer_size, device_info); |
+ if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) |
+ return false; |
+ |
+ interface_detail->reset( |
+ reinterpret_cast<SP_DEVICE_INTERFACE_DETAIL_DATA*>(malloc(buffer_size))); |
+ (*interface_detail)->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA); |
+ return SetupDiGetDeviceInterfaceDetail(device_info_list, interface_data, |
+ interface_detail->get(), buffer_size, |
+ nullptr, nullptr) != 0; |
+} |
+ |
+} // namespace |
+ |
+namespace gfx { |
+ |
+// The physical size information is only available by looking in the EDID block |
+// via setup. However setup has the device path and not the device name that we |
+// use to identify displays. Therefore after looking up a device via setup we |
+// need to find the display again via EnumDisplayDevices (matching device path |
+// to the device ID of the display's interface) so we can return the device name |
+// (available from the interface's attached monitor). |
+std::vector<PhysicalDisplaySize> GetPhysicalSizeForDisplays() { |
+ std::vector<PhysicalDisplaySize> out; |
+ |
+ base::ScopedGeneric<HDEVINFO, DeviceInfoListScopedTraits> device_info_list( |
+ SetupDiGetClassDevs(&GUID_DEVICEINTERFACE_MONITOR, nullptr, nullptr, |
+ DIGCF_PRESENT | DIGCF_DEVICEINTERFACE)); |
+ |
+ if (!device_info_list.is_valid()) |
+ return out; |
+ |
+ SP_DEVICE_INTERFACE_DATA interface_data = {}; |
+ interface_data.cbSize = sizeof(interface_data); |
+ int interface_index = 0; |
+ while (SetupDiEnumDeviceInterfaces(device_info_list.get(), nullptr, |
+ &GUID_DEVICEINTERFACE_MONITOR, |
+ interface_index++, &interface_data)) { |
+ scoped_ptr<SP_DEVICE_INTERFACE_DETAIL_DATA, base::FreeDeleter> |
+ interface_detail; |
+ SP_DEVINFO_DATA device_info = {}; |
+ device_info.cbSize = sizeof(device_info); |
+ bool get_info_succeeded = |
+ GetInterfaceDetailAndDeviceInfo(device_info_list.get(), &interface_data, |
+ &interface_detail, &device_info); |
+ if (!get_info_succeeded) |
+ continue; |
+ |
+ DISPLAY_DEVICE display_device = {}; |
+ display_device.cb = sizeof(display_device); |
+ int display_index = 0; |
+ while (EnumDisplayDevices(nullptr, display_index++, &display_device, |
+ EDD_GET_DEVICE_INTERFACE_NAME)) { |
+ DISPLAY_DEVICE attached_device = {}; |
+ attached_device.cb = sizeof(attached_device); |
+ int attached_index = 0; |
+ while (EnumDisplayDevices(display_device.DeviceName, attached_index++, |
+ &attached_device, |
+ EDD_GET_DEVICE_INTERFACE_NAME)) { |
+ wchar_t* attached_device_id = attached_device.DeviceID; |
+ wchar_t* setup_device_path = interface_detail->DevicePath; |
+ if (wcsicmp(attached_device_id, setup_device_path) == 0) { |
+ int width_mm; |
+ int height_mm; |
+ bool found = GetSizeFromRegistry(device_info_list.get(), &device_info, |
+ &width_mm, &height_mm); |
+ if (found) { |
+ out.push_back( |
+ PhysicalDisplaySize(base::WideToUTF8(display_device.DeviceName), |
+ width_mm, height_mm)); |
+ } |
+ break; |
+ } |
+ } |
+ } |
+ } |
+ return out; |
+} |
+ |
+} // namespace gfx |