Something

static void renderresult_stampinfo()
{
	RenderResult rres;
	
	/* this is the basic trick to get the displayed float or char rect from render result */
	RE_GetResultImage(RE_GetRender(G.scene->id.name), &rres);

	/* size of rect
	rres.rectx, rres.recty */
	
	if(rres.rect32);
	else if(rres.rectf);
	
}