Function ImGui_ImageButtonEx 

pub unsafe extern "C" fn ImGui_ImageButtonEx(
    id: ImGuiID,
    tex_ref: ImTextureRef,
    image_size: *const ImVec2,
    uv0: *const ImVec2,
    uv1: *const ImVec2,
    bg_col: *const ImVec4,
    tint_col: *const ImVec4,
    flags: ImGuiButtonFlags,
) -> bool