Re: ABI rules on accessing colormap->colors?

[Peter Zelezny <pzel dodo com au>]

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.