XP_BZERO(&message_data, sizeof(IL_MessageData));
nsCRT::zero(&message_data, sizeof(IL_MessageData));
il_dimensions_notify(il_container *ic, int dest_width, int dest_height){    IL_MessageData message_data;    IL_ImageReq *image_req;        XP_BZERO(&message_data, sizeof(IL_MessageData));	PR_ASSERT(ic->clients);    for (image_req = ic->clients; image_req; image_req = image_req->next) {        message_data.image_instance = image_req;        message_data.width = dest_width;   /* Note: these are stored as */        message_data.height = dest_height; /* uint16s. */        XP_NotifyObservers(image_req->obs_list, IL_DIMENSIONS, &message_data);    }}