PowerToys/src/common/os-detection/os-detect.cpp

#include "pch.h"
#include "os-detect.h"

#include <winrt/Windows.Foundation.Metadata.h>

// The following three helper functions determine if the user has a build version higher than or equal to 19h1, as that is a requirement for xaml islands
// Source : Microsoft-ui-xaml github
// Link: https://github.com/microsoft/microsoft-ui-xaml/blob/c045cde57c5c754683d674634a0baccda34d58c4/dev/dll/SharedHelpers.cpp
template<uint16_t APIVersion>
bool IsAPIContractVxAvailable()
{
    static bool isAPIContractVxAvailableInitialized = false;
    static bool isAPIContractVxAvailable = false;
    if (!isAPIContractVxAvailableInitialized)
    {
        isAPIContractVxAvailableInitialized = true;
        isAPIContractVxAvailable = winrt::Windows::Foundation::Metadata::ApiInformation::IsApiContractPresent(L"Windows.Foundation.UniversalApiContract", APIVersion);
    }

    return isAPIContractVxAvailable;
}

bool IsAPIContractV8Available()
{
    return IsAPIContractVxAvailable<8>();
}

bool Is19H1OrHigher()
{
    return IsAPIContractV8Available();
}

// This function returns true if the build is 19h1 or higher, so that we deploy the new settings.
// It returns false otherwise.
bool UseNewSettings()
{
    return Is19H1OrHigher();
}