No longer call `get_inner_size` at each frame
No longer call `get_inner_size` at each frame

TyOverby/glium,rozaliev/glium,acolley/glium,glium/glium,bvssvni/glium,sdotz/glium,cpjreynolds/glium,christopheraugustus/glium,carbidegames/glium,tomaka/glium,caldwell/glium,nicokoch/glium,binsoftware/glium,msiglreith/glium