Function ImFont_CalcTextSizeA

pub unsafe extern "C" fn ImFont_CalcTextSizeA(
    pOut: *mut ImVec2,
    self_: *mut ImFont,
    size: f32,
    max_width: f32,
    wrap_width: f32,
    text_begin: *const i8,
    text_end: *const i8,
    remaining: *mut *const i8,
)