Color.toVector()
takes an ARGB integer. All 32 bit colours in Starling are ARGB/RGB, i.e. with the colour in the bottom 24 bits, as that’s how everyone writes them. See e.g. the colours at the top of the Color
class.
The upper 8 bits are for alpha, but are often optional. So you can supply an RGB integer to Color.toVector()
no problem, taking into account that it also sets the alpha to zero if necessary.