Re: 24-bit-per-pixel limit to Gdk RGB ?

[Peter Finderup Lund <firefly diku dk>]

On Wed, 19 Feb 2003, individual wrote:

> Thank you to all those who helped me with this issue. I now understand
> bit depths a bit better.
>
> I gave it a shot, and the Gtk one came out very quickly, and looks
> great. In 24 bpp colour!
>
> I had a harder time with the xlib one, for some reason that I am as
> likely to figure out as the origin of the Moais on Easter Island, I had
> to add space every RGB triplet with a leading 0.

That's because you got a 32-bit visual -- or because you used a 32-bit
pixmap format.  You can ask for a list of visuals (they are numbered --
but the number varies between X servers) and pick the one you like best.
xdpyinfo will tell you which visuals you can choose between and their
characteristics if you want to make an easy one-off test program.

You can also use different pixmap formats.  AFAIR you ask for a list of
supported bit depths and then simply make a pixmap of that depth (the
depth is part of the pixmap structure).

-Peter

"Of course, I'm not unbiased, but in my humble opinion, I've
 gotten close to something that I can be really proud of."
 -- Knuth on The Art of Computer Programming.