| // Copyright (c) 2012 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 "base/win/win_util.h" |
| |
| #include <aclapi.h> |
| #include <cfgmgr32.h> |
| #include <initguid.h> |
| #include <powrprof.h> |
| #include <shobjidl.h> // Must be before propkey. |
| |
| #include <inspectable.h> |
| #include <mdmregistration.h> |
| #include <objbase.h> |
| #include <propkey.h> |
| #include <propvarutil.h> |
| #include <psapi.h> |
| #include <roapi.h> |
| #include <sddl.h> |
| #include <setupapi.h> |
| #include <shellscalingapi.h> |
| #include <shlwapi.h> |
| #include <signal.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| #include <tchar.h> // Must be before tpcshrd.h or for any use of _T macro |
| #include <tpcshrd.h> |
| #include <uiviewsettingsinterop.h> |
| #include <windows.ui.viewmanagement.h> |
| #include <winstring.h> |
| #include <wrl/client.h> |
| #include <wrl/wrappers/corewrappers.h> |
| |
| #include <memory> |
| |
| #include "base/base_switches.h" |
| #include "base/command_line.h" |
| #include "base/files/file_path.h" |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "base/strings/string_util.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "base/threading/thread_restrictions.h" |
| #include "base/win/core_winrt_util.h" |
| #include "base/win/registry.h" |
| #include "base/win/scoped_co_mem.h" |
| #include "base/win/scoped_handle.h" |
| #include "base/win/scoped_hstring.h" |
| #include "base/win/scoped_propvariant.h" |
| #include "base/win/win_client_metrics.h" |
| #include "base/win/windows_version.h" |
| |
| namespace base { |
| namespace win { |
| |
| namespace { |
| |
| // Sets the value of |property_key| to |property_value| in |property_store|. |
| bool SetPropVariantValueForPropertyStore( |
| IPropertyStore* property_store, |
| const PROPERTYKEY& property_key, |
| const ScopedPropVariant& property_value) { |
| DCHECK(property_store); |
| |
| HRESULT result = property_store->SetValue(property_key, property_value.get()); |
| if (result == S_OK) |
| result = property_store->Commit(); |
| if (SUCCEEDED(result)) |
| return true; |
| #if DCHECK_IS_ON() |
| ScopedCoMem<OLECHAR> guidString; |
| ::StringFromCLSID(property_key.fmtid, &guidString); |
| if (HRESULT_FACILITY(result) == FACILITY_WIN32) |
| ::SetLastError(HRESULT_CODE(result)); |
| // See third_party/perl/c/i686-w64-mingw32/include/propkey.h for GUID and |
| // PID definitions. |
| DPLOG(ERROR) << "Failed to set property with GUID " << guidString << " PID " |
| << property_key.pid; |
| #endif |
| return false; |
| } |
| |
| void __cdecl ForceCrashOnSigAbort(int) { |
| *((volatile int*)0) = 0x1337; |
| } |
| |
| // Returns the current platform role. We use the PowerDeterminePlatformRoleEx |
| // API for that. |
| POWER_PLATFORM_ROLE GetPlatformRole() { |
| return PowerDeterminePlatformRoleEx(POWER_PLATFORM_ROLE_V2); |
| } |
| |
| // Method used for Windows 8.1 and later. |
| // Since we support versions earlier than 8.1, we must dynamically load this |
| // function from user32.dll, so it won't fail to load in runtime. For earlier |
| // Windows versions GetProcAddress will return null and report failure so that |
| // callers can fall back on the deprecated SetProcessDPIAware. |
| bool SetProcessDpiAwarenessWrapper(PROCESS_DPI_AWARENESS value) { |
| decltype(&::SetProcessDpiAwareness) set_process_dpi_awareness_func = |
| reinterpret_cast<decltype(&::SetProcessDpiAwareness)>(GetProcAddress( |
| GetModuleHandle(L"user32.dll"), "SetProcessDpiAwarenessInternal")); |
| if (set_process_dpi_awareness_func) { |
| HRESULT hr = set_process_dpi_awareness_func(value); |
| if (SUCCEEDED(hr)) |
| return true; |
| DLOG_IF(ERROR, hr == E_ACCESSDENIED) |
| << "Access denied error from SetProcessDpiAwarenessInternal. Function " |
| "called twice, or manifest was used."; |
| NOTREACHED() |
| << "SetProcessDpiAwarenessInternal failed with unexpected error: " |
| << hr; |
| return false; |
| } |
| |
| DCHECK_LT(GetVersion(), VERSION_WIN8_1) << "SetProcessDpiAwarenessInternal " |
| "should be available on all " |
| "platforms >= Windows 8.1"; |
| return false; |
| } |
| |
| } // namespace |
| |
| // Uses the Windows 10 WRL API's to query the current system state. The API's |
| // we are using in the function below are supported in Win32 apps as per msdn. |
| // It looks like the API implementation is buggy at least on Surface 4 causing |
| // it to always return UserInteractionMode_Touch which as per documentation |
| // indicates tablet mode. |
| bool IsWindows10TabletMode(HWND hwnd) { |
| if (GetVersion() < VERSION_WIN10) |
| return false; |
| |
| if (!ResolveCoreWinRTDelayload() || |
| !ScopedHString::ResolveCoreWinRTStringDelayload()) { |
| return false; |
| } |
| |
| ScopedHString view_settings_guid = ScopedHString::Create( |
| RuntimeClass_Windows_UI_ViewManagement_UIViewSettings); |
| Microsoft::WRL::ComPtr<IUIViewSettingsInterop> view_settings_interop; |
| HRESULT hr = base::win::RoGetActivationFactory( |
| view_settings_guid.get(), IID_PPV_ARGS(&view_settings_interop)); |
| if (FAILED(hr)) |
| return false; |
| |
| Microsoft::WRL::ComPtr<ABI::Windows::UI::ViewManagement::IUIViewSettings> |
| view_settings; |
| hr = view_settings_interop->GetForWindow(hwnd, IID_PPV_ARGS(&view_settings)); |
| if (FAILED(hr)) |
| return false; |
| |
| ABI::Windows::UI::ViewManagement::UserInteractionMode mode = |
| ABI::Windows::UI::ViewManagement::UserInteractionMode_Mouse; |
| view_settings->get_UserInteractionMode(&mode); |
| return mode == ABI::Windows::UI::ViewManagement::UserInteractionMode_Touch; |
| } |
| |
| // Returns true if a physical keyboard is detected on Windows 8 and up. |
| // Uses the Setup APIs to enumerate the attached keyboards and returns true |
| // if the keyboard count is 1 or more.. While this will work in most cases |
| // it won't work if there are devices which expose keyboard interfaces which |
| // are attached to the machine. |
| bool IsKeyboardPresentOnSlate(std::string* reason, HWND hwnd) { |
| bool result = false; |
| |
| if (GetVersion() < VERSION_WIN8) { |
| if (reason) |
| *reason = "Detection not supported"; |
| return false; |
| } |
| |
| // This function is only supported for Windows 8 and up. |
| if (CommandLine::ForCurrentProcess()->HasSwitch( |
| switches::kDisableUsbKeyboardDetect)) { |
| if (reason) |
| *reason = "Detection disabled"; |
| return false; |
| } |
| |
| // This function should be only invoked for machines with touch screens. |
| if ((GetSystemMetrics(SM_DIGITIZER) & NID_INTEGRATED_TOUCH) |
| != NID_INTEGRATED_TOUCH) { |
| if (reason) { |
| *reason += "NID_INTEGRATED_TOUCH\n"; |
| result = true; |
| } else { |
| return true; |
| } |
| } |
| |
| // If it is a tablet device we assume that there is no keyboard attached. |
| if (IsTabletDevice(reason, hwnd)) { |
| if (reason) |
| *reason += "Tablet device.\n"; |
| return false; |
| } else { |
| if (reason) { |
| *reason += "Not a tablet device"; |
| result = true; |
| } else { |
| return true; |
| } |
| } |
| |
| // To determine whether a keyboard is present on the device, we do the |
| // following:- |
| // 1. Check whether the device supports auto rotation. If it does then |
| // it possibly supports flipping from laptop to slate mode. If it |
| // does not support auto rotation, then we assume it is a desktop |
| // or a normal laptop and assume that there is a keyboard. |
| |
| // 2. If the device supports auto rotation, then we get its platform role |
| // and check the system metric SM_CONVERTIBLESLATEMODE to see if it is |
| // being used in slate mode. If yes then we return false here to ensure |
| // that the OSK is displayed. |
| |
| // 3. If step 1 and 2 fail then we check attached keyboards and return true |
| // if we find ACPI\* or HID\VID* keyboards. |
| |
| typedef BOOL (WINAPI* GetAutoRotationState)(PAR_STATE state); |
| |
| GetAutoRotationState get_rotation_state = |
| reinterpret_cast<GetAutoRotationState>(::GetProcAddress( |
| GetModuleHandle(L"user32.dll"), "GetAutoRotationState")); |
| |
| if (get_rotation_state) { |
| AR_STATE auto_rotation_state = AR_ENABLED; |
| get_rotation_state(&auto_rotation_state); |
| if ((auto_rotation_state & AR_NOSENSOR) || |
| (auto_rotation_state & AR_NOT_SUPPORTED)) { |
| // If there is no auto rotation sensor or rotation is not supported in |
| // the current configuration, then we can assume that this is a desktop |
| // or a traditional laptop. |
| if (reason) { |
| *reason += (auto_rotation_state & AR_NOSENSOR) ? "AR_NOSENSOR\n" : |
| "AR_NOT_SUPPORTED\n"; |
| result = true; |
| } else { |
| return true; |
| } |
| } |
| } |
| |
| const GUID KEYBOARD_CLASS_GUID = |
| { 0x4D36E96B, 0xE325, 0x11CE, |
| { 0xBF, 0xC1, 0x08, 0x00, 0x2B, 0xE1, 0x03, 0x18 } }; |
| |
| // Query for all the keyboard devices. |
| HDEVINFO device_info = |
| SetupDiGetClassDevs(&KEYBOARD_CLASS_GUID, NULL, NULL, DIGCF_PRESENT); |
| if (device_info == INVALID_HANDLE_VALUE) { |
| if (reason) |
| *reason += "No keyboard info\n"; |
| return result; |
| } |
| |
| // Enumerate all keyboards and look for ACPI\PNP and HID\VID devices. If |
| // the count is more than 1 we assume that a keyboard is present. This is |
| // under the assumption that there will always be one keyboard device. |
| for (DWORD i = 0;; ++i) { |
| SP_DEVINFO_DATA device_info_data = { 0 }; |
| device_info_data.cbSize = sizeof(device_info_data); |
| if (!SetupDiEnumDeviceInfo(device_info, i, &device_info_data)) |
| break; |
| |
| // Get the device ID. |
| wchar_t device_id[MAX_DEVICE_ID_LEN]; |
| CONFIGRET status = CM_Get_Device_ID(device_info_data.DevInst, |
| device_id, |
| MAX_DEVICE_ID_LEN, |
| 0); |
| if (status == CR_SUCCESS) { |
| // To reduce the scope of the hack we only look for ACPI and HID\\VID |
| // prefixes in the keyboard device ids. |
| if (StartsWith(device_id, L"ACPI", CompareCase::INSENSITIVE_ASCII) || |
| StartsWith(device_id, L"HID\\VID", CompareCase::INSENSITIVE_ASCII)) { |
| if (reason) { |
| *reason += "device: "; |
| *reason += WideToUTF8(device_id); |
| *reason += '\n'; |
| } |
| // The heuristic we are using is to check the count of keyboards and |
| // return true if the API's report one or more keyboards. Please note |
| // that this will break for non keyboard devices which expose a |
| // keyboard PDO. |
| result = true; |
| } |
| } |
| } |
| return result; |
| } |
| |
| static bool g_crash_on_process_detach = false; |
| |
| void GetNonClientMetrics(NONCLIENTMETRICS_XP* metrics) { |
| DCHECK(metrics); |
| metrics->cbSize = sizeof(*metrics); |
| const bool success = !!SystemParametersInfo( |
| SPI_GETNONCLIENTMETRICS, |
| metrics->cbSize, |
| reinterpret_cast<NONCLIENTMETRICS*>(metrics), |
| 0); |
| DCHECK(success); |
| } |
| |
| bool GetUserSidString(std::wstring* user_sid) { |
| // Get the current token. |
| HANDLE token = NULL; |
| if (!::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &token)) |
| return false; |
| ScopedHandle token_scoped(token); |
| |
| DWORD size = sizeof(TOKEN_USER) + SECURITY_MAX_SID_SIZE; |
| std::unique_ptr<BYTE[]> user_bytes(new BYTE[size]); |
| TOKEN_USER* user = reinterpret_cast<TOKEN_USER*>(user_bytes.get()); |
| |
| if (!::GetTokenInformation(token, TokenUser, user, size, &size)) |
| return false; |
| |
| if (!user->User.Sid) |
| return false; |
| |
| // Convert the data to a string. |
| wchar_t* sid_string; |
| if (!::ConvertSidToStringSid(user->User.Sid, &sid_string)) |
| return false; |
| |
| *user_sid = sid_string; |
| |
| ::LocalFree(sid_string); |
| |
| return true; |
| } |
| |
| bool UserAccountControlIsEnabled() { |
| // This can be slow if Windows ends up going to disk. Should watch this key |
| // for changes and only read it once, preferably on the file thread. |
| // http://code.google.com/p/chromium/issues/detail?id=61644 |
| ThreadRestrictions::ScopedAllowIO allow_io; |
| |
| RegKey key(HKEY_LOCAL_MACHINE, |
| L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System", |
| KEY_READ); |
| DWORD uac_enabled; |
| if (key.ReadValueDW(L"EnableLUA", &uac_enabled) != ERROR_SUCCESS) |
| return true; |
| // Users can set the EnableLUA value to something arbitrary, like 2, which |
| // Vista will treat as UAC enabled, so we make sure it is not set to 0. |
| return (uac_enabled != 0); |
| } |
| |
| bool SetBooleanValueForPropertyStore(IPropertyStore* property_store, |
| const PROPERTYKEY& property_key, |
| bool property_bool_value) { |
| ScopedPropVariant property_value; |
| if (FAILED(InitPropVariantFromBoolean(property_bool_value, |
| property_value.Receive()))) { |
| return false; |
| } |
| |
| return SetPropVariantValueForPropertyStore(property_store, |
| property_key, |
| property_value); |
| } |
| |
| bool SetStringValueForPropertyStore(IPropertyStore* property_store, |
| const PROPERTYKEY& property_key, |
| const wchar_t* property_string_value) { |
| ScopedPropVariant property_value; |
| if (FAILED(InitPropVariantFromString(property_string_value, |
| property_value.Receive()))) { |
| return false; |
| } |
| |
| return SetPropVariantValueForPropertyStore(property_store, |
| property_key, |
| property_value); |
| } |
| |
| bool SetClsidForPropertyStore(IPropertyStore* property_store, |
| const PROPERTYKEY& property_key, |
| const CLSID& property_clsid_value) { |
| ScopedPropVariant property_value; |
| if (FAILED(InitPropVariantFromCLSID(property_clsid_value, |
| property_value.Receive()))) { |
| return false; |
| } |
| |
| return SetPropVariantValueForPropertyStore(property_store, property_key, |
| property_value); |
| } |
| |
| bool SetAppIdForPropertyStore(IPropertyStore* property_store, |
| const wchar_t* app_id) { |
| // App id should be less than 64 chars and contain no space. And recommended |
| // format is CompanyName.ProductName[.SubProduct.ProductNumber]. |
| // See http://msdn.microsoft.com/en-us/library/dd378459%28VS.85%29.aspx |
| DCHECK(lstrlen(app_id) < 64 && wcschr(app_id, L' ') == NULL); |
| |
| return SetStringValueForPropertyStore(property_store, |
| PKEY_AppUserModel_ID, |
| app_id); |
| } |
| |
| static const char16 kAutoRunKeyPath[] = |
| L"Software\\Microsoft\\Windows\\CurrentVersion\\Run"; |
| |
| bool AddCommandToAutoRun(HKEY root_key, const string16& name, |
| const string16& command) { |
| RegKey autorun_key(root_key, kAutoRunKeyPath, KEY_SET_VALUE); |
| return (autorun_key.WriteValue(name.c_str(), command.c_str()) == |
| ERROR_SUCCESS); |
| } |
| |
| bool RemoveCommandFromAutoRun(HKEY root_key, const string16& name) { |
| RegKey autorun_key(root_key, kAutoRunKeyPath, KEY_SET_VALUE); |
| return (autorun_key.DeleteValue(name.c_str()) == ERROR_SUCCESS); |
| } |
| |
| bool ReadCommandFromAutoRun(HKEY root_key, |
| const string16& name, |
| string16* command) { |
| RegKey autorun_key(root_key, kAutoRunKeyPath, KEY_QUERY_VALUE); |
| return (autorun_key.ReadValue(name.c_str(), command) == ERROR_SUCCESS); |
| } |
| |
| void SetShouldCrashOnProcessDetach(bool crash) { |
| g_crash_on_process_detach = crash; |
| } |
| |
| bool ShouldCrashOnProcessDetach() { |
| return g_crash_on_process_detach; |
| } |
| |
| void SetAbortBehaviorForCrashReporting() { |
| // Prevent CRT's abort code from prompting a dialog or trying to "report" it. |
| // Disabling the _CALL_REPORTFAULT behavior is important since otherwise it |
| // has the sideffect of clearing our exception filter, which means we |
| // don't get any crash. |
| _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT); |
| |
| // Set a SIGABRT handler for good measure. We will crash even if the default |
| // is left in place, however this allows us to crash earlier. And it also |
| // lets us crash in response to code which might directly call raise(SIGABRT) |
| signal(SIGABRT, ForceCrashOnSigAbort); |
| } |
| |
| bool IsTabletDevice(std::string* reason, HWND hwnd) { |
| if (GetVersion() < VERSION_WIN8) { |
| if (reason) |
| *reason = "Tablet device detection not supported below Windows 8\n"; |
| return false; |
| } |
| |
| if (IsWindows10TabletMode(hwnd)) |
| return true; |
| |
| return IsDeviceUsedAsATablet(reason); |
| } |
| |
| // This method is used to set the right interactions media queries, |
| // see https://drafts.csswg.org/mediaqueries-4/#mf-interaction. It doesn't |
| // check the Windows 10 tablet mode because it doesn't reflect the actual |
| // input configuration of the device and can be manually triggered by the user |
| // independently from the hardware state. |
| bool IsDeviceUsedAsATablet(std::string* reason) { |
| if (GetVersion() < VERSION_WIN8) { |
| if (reason) |
| *reason = "Tablet device detection not supported below Windows 8\n"; |
| return false; |
| } |
| |
| if (GetSystemMetrics(SM_MAXIMUMTOUCHES) == 0) { |
| if (reason) { |
| *reason += "Device does not support touch.\n"; |
| } else { |
| return false; |
| } |
| } |
| |
| // If the device is docked, the user is treating the device as a PC. |
| if (GetSystemMetrics(SM_SYSTEMDOCKED) != 0) { |
| if (reason) { |
| *reason += "SM_SYSTEMDOCKED\n"; |
| } else { |
| return false; |
| } |
| } |
| |
| // If the device is not supporting rotation, it's unlikely to be a tablet, |
| // a convertible or a detachable. |
| // See |
| // https://msdn.microsoft.com/en-us/library/windows/desktop/dn629263(v=vs.85).aspx |
| typedef decltype(GetAutoRotationState)* GetAutoRotationStateType; |
| GetAutoRotationStateType get_auto_rotation_state_func = |
| reinterpret_cast<GetAutoRotationStateType>(GetProcAddress( |
| GetModuleHandle(L"user32.dll"), "GetAutoRotationState")); |
| |
| if (get_auto_rotation_state_func) { |
| AR_STATE rotation_state = AR_ENABLED; |
| if (get_auto_rotation_state_func(&rotation_state) && |
| (rotation_state & (AR_NOT_SUPPORTED | AR_LAPTOP | AR_NOSENSOR)) != 0) |
| return false; |
| } |
| |
| // PlatformRoleSlate was added in Windows 8+. |
| POWER_PLATFORM_ROLE role = GetPlatformRole(); |
| bool is_tablet = false; |
| if (role == PlatformRoleMobile || role == PlatformRoleSlate) { |
| is_tablet = !GetSystemMetrics(SM_CONVERTIBLESLATEMODE); |
| if (!is_tablet) { |
| if (reason) { |
| *reason += "Not in slate mode.\n"; |
| } else { |
| return false; |
| } |
| } else { |
| if (reason) { |
| *reason += (role == PlatformRoleMobile) ? "PlatformRoleMobile\n" |
| : "PlatformRoleSlate\n"; |
| } |
| } |
| } else { |
| if (reason) |
| *reason += "Device role is not mobile or slate.\n"; |
| } |
| return is_tablet; |
| } |
| |
| bool IsUser32AndGdi32Available() { |
| static auto is_user32_and_gdi32_available = []() { |
| // If win32k syscalls aren't disabled, then user32 and gdi32 are available. |
| |
| // Can't disable win32k prior to windows 8. |
| if (GetVersion() < VERSION_WIN8) |
| return true; |
| |
| typedef decltype( |
| GetProcessMitigationPolicy)* GetProcessMitigationPolicyType; |
| GetProcessMitigationPolicyType get_process_mitigation_policy_func = |
| reinterpret_cast<GetProcessMitigationPolicyType>(GetProcAddress( |
| GetModuleHandle(L"kernel32.dll"), "GetProcessMitigationPolicy")); |
| |
| if (!get_process_mitigation_policy_func) |
| return true; |
| |
| PROCESS_MITIGATION_SYSTEM_CALL_DISABLE_POLICY policy = {}; |
| if (get_process_mitigation_policy_func(GetCurrentProcess(), |
| ProcessSystemCallDisablePolicy, |
| &policy, sizeof(policy))) { |
| return policy.DisallowWin32kSystemCalls == 0; |
| } |
| |
| return true; |
| }(); |
| return is_user32_and_gdi32_available; |
| } |
| |
| bool GetLoadedModulesSnapshot(HANDLE process, std::vector<HMODULE>* snapshot) { |
| DCHECK(snapshot); |
| DCHECK_EQ(0u, snapshot->size()); |
| snapshot->resize(128); |
| |
| // We will retry at least once after first determining |bytes_required|. If |
| // the list of modules changes after we receive |bytes_required| we may retry |
| // more than once. |
| int retries_remaining = 5; |
| do { |
| DWORD bytes_required = 0; |
| // EnumProcessModules returns 'success' even if the buffer size is too |
| // small. |
| DCHECK_GE(std::numeric_limits<DWORD>::max(), |
| snapshot->size() * sizeof(HMODULE)); |
| if (!::EnumProcessModules( |
| process, &(*snapshot)[0], |
| static_cast<DWORD>(snapshot->size() * sizeof(HMODULE)), |
| &bytes_required)) { |
| DPLOG(ERROR) << "::EnumProcessModules failed."; |
| return false; |
| } |
| DCHECK_EQ(0u, bytes_required % sizeof(HMODULE)); |
| size_t num_modules = bytes_required / sizeof(HMODULE); |
| if (num_modules <= snapshot->size()) { |
| // Buffer size was too big, presumably because a module was unloaded. |
| snapshot->erase(snapshot->begin() + num_modules, snapshot->end()); |
| return true; |
| } else if (num_modules == 0) { |
| DLOG(ERROR) << "Can't determine the module list size."; |
| return false; |
| } else { |
| // Buffer size was too small. Try again with a larger buffer. A little |
| // more room is given to avoid multiple expensive calls to |
| // ::EnumProcessModules() just because one module has been added. |
| snapshot->resize(num_modules + 8, NULL); |
| } |
| } while (--retries_remaining); |
| |
| DLOG(ERROR) << "Failed to enumerate modules."; |
| return false; |
| } |
| |
| void EnableFlicks(HWND hwnd) { |
| ::RemoveProp(hwnd, MICROSOFT_TABLETPENSERVICE_PROPERTY); |
| } |
| |
| void DisableFlicks(HWND hwnd) { |
| ::SetProp(hwnd, MICROSOFT_TABLETPENSERVICE_PROPERTY, |
| reinterpret_cast<HANDLE>(TABLET_DISABLE_FLICKS | |
| TABLET_DISABLE_FLICKFALLBACKKEYS)); |
| } |
| |
| bool IsProcessPerMonitorDpiAware() { |
| enum class PerMonitorDpiAware { |
| UNKNOWN = 0, |
| PER_MONITOR_DPI_UNAWARE, |
| PER_MONITOR_DPI_AWARE, |
| }; |
| static PerMonitorDpiAware per_monitor_dpi_aware = PerMonitorDpiAware::UNKNOWN; |
| if (per_monitor_dpi_aware == PerMonitorDpiAware::UNKNOWN) { |
| per_monitor_dpi_aware = PerMonitorDpiAware::PER_MONITOR_DPI_UNAWARE; |
| HMODULE shcore_dll = ::LoadLibrary(L"shcore.dll"); |
| if (shcore_dll) { |
| auto get_process_dpi_awareness_func = |
| reinterpret_cast<decltype(::GetProcessDpiAwareness)*>( |
| ::GetProcAddress(shcore_dll, "GetProcessDpiAwareness")); |
| if (get_process_dpi_awareness_func) { |
| PROCESS_DPI_AWARENESS awareness; |
| if (SUCCEEDED(get_process_dpi_awareness_func(nullptr, &awareness)) && |
| awareness == PROCESS_PER_MONITOR_DPI_AWARE) |
| per_monitor_dpi_aware = PerMonitorDpiAware::PER_MONITOR_DPI_AWARE; |
| } |
| } |
| } |
| return per_monitor_dpi_aware == PerMonitorDpiAware::PER_MONITOR_DPI_AWARE; |
| } |
| |
| void EnableHighDPISupport() { |
| // Enable per-monitor DPI for Win10 or above instead of Win8.1 since Win8.1 |
| // does not have EnableChildWindowDpiMessage, necessary for correct non-client |
| // area scaling across monitors. |
| PROCESS_DPI_AWARENESS process_dpi_awareness = |
| GetVersion() >= VERSION_WIN10 ? PROCESS_PER_MONITOR_DPI_AWARE |
| : PROCESS_SYSTEM_DPI_AWARE; |
| if (!SetProcessDpiAwarenessWrapper(process_dpi_awareness)) { |
| // For windows versions where SetProcessDpiAwareness is not available or |
| // failed, try its predecessor. |
| BOOL result = ::SetProcessDPIAware(); |
| DCHECK(result) << "SetProcessDPIAware failed."; |
| } |
| } |
| |
| } // namespace win |
| } // namespace base |
