Function ImGui_ImageButton 

pub unsafe extern "C" fn ImGui_ImageButton(
    str_id: *const c_char,
    tex_ref: ImTextureRef,
    image_size: *const ImVec2,
    uv0: *const ImVec2,
    uv1: *const ImVec2,
    bg_col: *const ImVec4,
    tint_col: *const ImVec4,
) -> bool