nanogui: Re: white color in images - SOLVED
Subject:
Re: [nanogui] white color in images - SOLVED
From:
Hinko Kocevar ####@####.####
Date:
7 Sep 2004 22:37:58 +0100
Message-Id: <413E2A33.3010804@iskramedical.si>
Hinko Kocevar wrote:
> Hi,
>
> I have some strange effects while trying to display 16-bit color PNG
> image on my embedded target. All colors are fine execept for white - it
> is displayed as black instead. White shades to some extent are also
> displayed black.
>
> I using FLTK 1.1.4 on top of mw-0.90 and nxlib-0.45 on 16bpp display.
> Widgets can use white normally, problem exists only for images.
>
> Has anyone also experienced this?
>
> regards,
> h
>
I was pursuing this problem these days and as it turned out there is a
problem with creating graphic context if no valuemask is set, eg. for
pixmap. I solved it by replacing folowing lines in CrGC.c, nxlib-045:
/* X11 defaults to fg=black, bg=white, NX is opposite...*/
if (!(valuemask & GCForeground))
XSetForeground(dpy, gc, 0L); /* black*/
if (!(valuemask & GCBackground))
XSetBackground(dpy, gc, ~0L); /* white*/
with these
/* X11 defaults to fg=black, bg=white, NX is opposite...*/
if (!(valuemask & GCForeground))
XSetForeground(dpy, gc, 0L); /* black*/
if (!(valuemask & GCBackground))
XSetBackground(dpy, gc, 0xffff0000); /* white*/
It is working for me.
Further I tested with using XSetForeground(dpy, gc, 0xffffffff) and
XSetBackground(dpy, gc, 0xff000000) and it also works here.
It looks like the values have to be swapped, despite the comment above.
regards,
h
--
hinko <dot> kocevar <at> iskramedical <dot> si
Hinko Kocevar, developer
Iskra Medical d.o.o., Stegne 23, 1k LJ, SLO-EU
"Aì rén" | [Analects XII:22]
