Re: ABI rules on accessing colormap->colors?

[Owen Taylor <otaylor redhat com>]

On Mon, 2003-09-15 at 00:45, Peter Zelezny wrote:
> 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?

Well, cmap->colors is going to have correct values for static color
and grayscale as well as pseudocolor .... so checking ->colors != NULL
is probably the most general thing to do.

But why not just use gdk_colormap_query_color() and let GTK+ worry
about this?

Regards,
                                                        Owen