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/* 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
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