/*
 * call-seq:
 *   text_size ( text, font=<lru or "cetus">, size=<lru or 20> ) -> [ width, height ]
 *
 * Returns the amount of space that would be used, if the text would be 
 * rendered with given parameters. If font and fontsize given,
 * it is saved for future call of Osd#text and Osd#text_size.
 */

static VALUE osd_text_size(int argc, VALUE *argv, VALUE self) {