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Diffstat (limited to 'mozglue/misc/WindowsDpiInitialization.cpp')
-rw-r--r-- | mozglue/misc/WindowsDpiInitialization.cpp | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/mozglue/misc/WindowsDpiInitialization.cpp b/mozglue/misc/WindowsDpiInitialization.cpp new file mode 100644 index 0000000000..972d577651 --- /dev/null +++ b/mozglue/misc/WindowsDpiInitialization.cpp @@ -0,0 +1,67 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "mozilla/WindowsDpiInitialization.h" + +#include "mozilla/DynamicallyLinkedFunctionPtr.h" +#include "mozilla/WindowsProcessMitigations.h" +#include "mozilla/WindowsVersion.h" + +#include <shellscalingapi.h> +#include <windows.h> + +namespace mozilla { + +typedef HRESULT(WINAPI* SetProcessDpiAwarenessType)(PROCESS_DPI_AWARENESS); +typedef BOOL(WINAPI* SetProcessDpiAwarenessContextType)(DPI_AWARENESS_CONTEXT); + +WindowsDpiInitializationResult WindowsDpiInitialization() { + // DPI Awareness can't be used in a Win32k Lockdown process, so there's + // nothing to do + if (IsWin32kLockedDown()) { + return WindowsDpiInitializationResult::Success; + } + + // From MSDN: + // SetProcessDpiAwarenessContext() was added in the Win10 Anniversary Update + // SetProcessDpiAwareness() was added in Windows 8.1 + // SetProcessDpiAware() was added in Windows Vista + // + // DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 wasn't added later until + // the Creators Update, so if it fails we just fall back to + // DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE + if (IsWin10AnniversaryUpdateOrLater()) { + DynamicallyLinkedFunctionPtr<SetProcessDpiAwarenessContextType> + setProcessDpiAwarenessContext(L"user32.dll", + "SetProcessDpiAwarenessContext"); + if (!setProcessDpiAwarenessContext) { + return WindowsDpiInitializationResult:: + FindSetProcessDpiAwarenessContextFailed; + } + + if (!setProcessDpiAwarenessContext( + DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) && + !setProcessDpiAwarenessContext( + DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE)) { + return WindowsDpiInitializationResult:: + SetProcessDpiAwarenessContextFailed; + } + + return WindowsDpiInitializationResult::Success; + } else { + DynamicallyLinkedFunctionPtr<SetProcessDpiAwarenessType> + setProcessDpiAwareness(L"Shcore.dll", "SetProcessDpiAwareness"); + if (!setProcessDpiAwareness) { + return WindowsDpiInitializationResult::FindSetProcessDpiAwarenessFailed; + } + + if (FAILED(setProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE))) { + return WindowsDpiInitializationResult::SetProcessDpiAwarenessFailed; + } + + return WindowsDpiInitializationResult::Success; + } +} + +} // namespace mozilla |