Emulates palettized modes (GT_PALETTE) on another target which can only do truecolor/greyscale/text modes or palettized modes of higher depth.
Force the parent target to use a specific mode, specified as a standard LibGGI mode string.
Specifies the target which to draw on (the `parent' target). This defaults to automatic selection (just like using ggiOpen(NULL) when GGI_DISPLAY is not set).