}
bool
-png_mptr::get_frame(synfig::Surface &surface, const synfig::RendDesc &renddesc, Time, synfig::ProgressCallback */*cb*/)
+png_mptr::get_frame(synfig::Surface &surface, const synfig::RendDesc &/*renddesc*/, Time, synfig::ProgressCallback */*cb*/)
{
//assert(0); // shouldn't be called?
surface=surface_buffer;