WoW Letterbox 16:9 macro

local r,_,_,w,h,o,s=16/9,UIParent:GetRect();o=(h-(w/r))/2;s=w/r/h;WorldFrame:SetPoint("TOPLEFT",0,-o); WorldFrame:SetPoint("BOTTOMRIGHT",0,o);UIParent:SetPoint("TOPLEFT",0,-o/s);UIParent:SetPoint("BOTTOMRIGHT",0,o/s);UIParent:SetScale(s)