An apparatus for processing a graphical data stream for display on a display device includes a processor, a first conversion module and a second conversion module. In one aspect, the emission driver includes a plurality of stages each configured to output an emission control signal, wherein each of the stages includes first and second driving blocks and a buffer block. The hopper is arranged to supply an edible material to the plurality of co-operating piston and nozzles. The shear damper in combination with sliding of the leaf spring through the mount accommodates this longitudinal lengthen during flexing.