Re: ABI rules on accessing colormap->colors?

[Owen Taylor <otaylor redhat com>]

On Mon, 2003-09-15 at 06:51, Peter Zelezny wrote:
> On Mon, 15 Sep 2003 06:21:21 -0400
> Owen Taylor <otaylor redhat com> wrote:
>
> > 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?
>
> Well, I'm trying to find a color inside the colormap that's as close as
> possible to the R,G,B I actually want. I don't have the exact pixel value.
>
> Basically, I'm doing a:
>       gdk_colormap_alloc_color (cmap, color, TRUE, TRUE);
> But on a most 8-bit PseudoColor displays, it fails, since the cmap is often
> full. So I fall back to traversing the cmap->colors to see which is the
> closest colour available. It gives pretty good results.
>
> I tried calling gdk_colormap_alloc_color() with the "best_match" arg TRUE,
> hoping this would be done for me, but it is not.

Well, why don't you debug that? If you're right and there is a bug
there, then we can discuss workarounds, once we know what that bug is.

                                                Owen