ABI rules on accessing colormap->colors?

[Peter Zelezny <pzel dodo com au>]

Hi All,

I want to use the "colors" field of a GdkColormap object. The current docs say:

gint size       For pseudo-color colormaps, the number of colors in the colormap.
GdkColor *colors        An array containing the current values in the colormap. This
can be used to map from pixel values back to RGB values. This is only
meaningful for pseudo-color colormaps.

On a TrueColor visual, I'm getting a size of 64 and colors of NULL (I'm not
sure if this is uninitialized or a proper NULL). On a 8bit PseudoColor server,
I get a size of 256 and ->colors are a valid array.

Before I try to access cmap->colors, what should I be checking?

a) if cmap->colors is NULL
b) if visual->type == PseudoColor
c) if cmap->size == 0
d) something else?

Thanks.