Function isKeyPressedImpl

src/SFML/Window/Unix/KeyboardImpl.cpp:582–597

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////////////////////////////////////////////////////////////
bool isKeyPressedImpl(KeyCode keycode)
{
    if (keycode != nullKeyCode)
    {
        const auto display = sf::priv::openDisplay();

        // Get the whole keyboard state
        std::array<char, 32> keys{};
        XQueryKeymap(display.get(), keys.data());

        // Check our keycode
        return (keys[keycode / 8] & (1 << (keycode % 8))) != 0;
    }

    return false;
}

} // anonymous namespace