[cairo] cairo-xlib-surface.c:402: _swap_ximage_to_native: Assertion `NOT_REACHED' failed.

[Daniel Amelang]

On 11/18/06, Erik Ohrnberger <erik at echohome.org> wrote:
> Dear Cairo users,
>         I've been struggling with a Gentoo system where the error message
> above is causing all the program that rely on cairo, like gtkmm based
> programs, to core out.

In cairo-xlib-surface.c, there's a comment that warns that this could happen:

    switch (ximage->bits_per_pixel) {
 ...
    default:
        /* This could be hit on some uncommon but possible cases,
	 * such as bpp=4. These are cases that libpixman can't deal
	 * with in any case.
	 */
	ASSERT_NOT_REACHED;
    }

I'm going to guess that in your case, ximage->bits_per_pixel is 24, as
that case also takes the default path.

>         I was wondering if there were any known issues of configuration
> changes that could be applied to remove this issue.

I think you can change the color depth in your Xorg.conf. I think
you're looking for this:

Option "Pixmap" "32"

On the other hand, maybe cairo should be able to handle 24 bpp, so in
that case it's a bug/feature request that should be filed. Carl?

Dan