Function winapi::um::uxtheme::GetThemeTextExtent

pub unsafe extern "system" fn GetThemeTextExtent(
    hTheme: HTHEME, 
    hdc: HDC, 
    iPartId: c_int, 
    iStateId: c_int, 
    pszText: LPCWSTR, 
    cchCharCount: c_int, 
    dwTextFlags: DWORD, 
    pBoundingRect: LPCRECT, 
    pExtentRect: LPRECT
) -> HRESULT