nanogui: FLTK colours fubar'd?
Subject:
Re: [nanogui] FLTK colours fubar'd?
From:
"Warren Seymour" ####@####.####
Date:
9 Dec 2006 13:00:05 +0000
Message-Id: <7ffbb33f0612090459o2a06814cw39a37fcaed74611a@mail.gmail.com>
Thanks for the feedback Greg- upon further inspection (ie a twelve-hour
session) I have ascertained that I'll need to play with the RGB masks in
XOpenDisplay- they need to be set for whatever pixel format I'm using. The
problem was that my framebuffer starts in 8-bit paletted mode by default.
Unforunately I can't use RGBA 8880 because my framebuffer doesn't support
32bpp. It does support 5650, but my evaluation board incorrectly decodes
this format to Analogue VGA, resulting in all colours being blue-shifted.
I'm guessing it will work correctly when I hook up an LCD panel; but
unfortunately the components I've ordered won't arrive for another month or
so.
6666 (with the upper 6-bits ignored) works great with the 'pbmtofb' test
program I've found, but unfortunately Nano-X doesn't support this colour
mode. It looks like I'm going to have to add this driver to Nano-X myself.
If it all works nicely I'll submit it to you for inspection.
As for endian-ness, it's little endian, so fingers crossed that isn't an
issue.
Just your replies let me know this project is far from dead, which I am very
grateful for.
Regards,
Warren.
On 12/9/06, Greg Haerr ####@####.#### wrote:
>
> : I'm running FLTK 1.1.7, Nano-X 0.91 and NXLIB 0.45 on a Colibri PXA270
> (ARM
> : architecture)
>
> > If it's any help, when I run the FLTK colbrowser program, odd things
> happen,
> eg incrementing or decrementing the red slider by 1 causes a dramatic
> change
> in colour.
>
> I'm wondering if by chance the RGBA is endian-swapped
> and ending up GRAB or something like that... Is the ARM
> running big-endian?
>
> If so, perhaps nano-X isn't in fact running properly.
>
> Otherwise, NXLIB is likely at fault, start perhaps
> with some inspection and debugging in XOpenDisplay,
> where the color format is detected. There may also be
> issues with images only, versus other color draws.
> We need to ascertain exactly what sorts of things are
> being drawn (images vs rect fills vs blits) and
> go from there.
>
> Regards,
>
> Greg
>
>
>
>
>
>
> :
> : When I run an FLTK application (namely the test programs) my colours are
> : wrong - maroon background, beige text, etc.
> :
> : fbset says:
> :
> : mode "640x480-56"
> : # D: 25.000 MHz, H: 29.481 kHz, V: 56.155 Hz
> : geometry 640 480 640 480 8
> : timings 40000 96 48 33 10 64 2
> : accel false
> : rgba 8/0,8/0,8/0,0/0
> : endmode
> :
> : I've configured Nano-X with SCREEN_PIXTYPE = MWPF_TRUECOLOR888
> :
> : Can anybody help me out here? It would be much obliged...
> :
> : Regards, Warren.
> :
>
>
