nanogui: Thread: Problem regarding image displaying

Dear all,
Thank you in helping me in displaying images and text in the nano-X.
I am now able to draw images and also use the keyboard keys( except
the arrow keys and other function keys , though I am using SCANKBD in
my configuration).
Now I am facing a problem in displaying images .
I have nano-X configured for framebuffer settings with no mouse support.
In this, the images being displayed are highly distorted.
The png images are displayed with stripes on them.
The bmp images are displayed with dots all over the image.
The jpg images are displayed with a few portions of the image being
replaced by the background color.
I have tried to use various methods like using GR_TRUE for background
GC, using different sizes of the same image and so on.
But still the problem remains the same.
Kindly give me some pointers to solve the problem.

Thanks and regards.

Pratish Ganguly

: The jpg images are displayed with a few portions of the image being
: replaced by the background color.

Make sure you're using the CVS version, previous versions
had issues with WHITE not being drawn, because nano-X
thought it was the transparent color.

What bpp is your hardware, and what bpp are
the png and bmp images?

Regards,

Greg

I have a similar problem. I am using FLTK1.1.7 and it's working well except that white shows as black. I am using a arm (intel xscale) based design with a linux frame buffer running 16 bits per pixel (MWPF_TRUECOLOR565).
The FLTK application shows correctly when compiled and run on suse linux (ie X windows directly - no microwindows) and even MS windows, so I think I have to look at nano-X somwhere.
I have tried the latest microwindows and nxlib from CVS today but it behaves the same.
I have tried changeing wp->background = WHITE in GsInitialize. This shows a white screen as you would expect, but the white bits (pictures or any box coloured white) in the FLTK program still show as black.
I would appreciate any hints on how to fix this as apart from that I am very happy with the results I have so far.
On another note, the mirror of this list on linuxhacker.org seems to not have updated since wednesday...
Thanks, Darren.

>>> "Greg Haerr" ####@####.#### 07/10/06 23:40 >>>
: The jpg images are displayed with a few portions of the image being
: replaced by the background color.

Make sure you're using the CVS version, previous versions
had issues with WHITE not being drawn, because nano-X
thought it was the transparent color.

What bpp is your hardware, and what bpp are
the png and bmp images?

Regards,

Greg

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I had this problem and fixed it and gave Greg the patch.
It was a simple fix but I would need to search for it.
I do not think it is included in the CVS.
Martin

-----Original Message-----
From: Darren Legge ####@####.####
Sent: Monday, October 09, 2006 8:22 AM
To: ####@####.####
Subject: Re: [nanogui] Problem regarding image displaying


I have a similar problem. I am using FLTK1.1.7 and it's working well
except that white shows as black. I am using a arm (intel xscale) based
design with a linux frame buffer running 16 bits per pixel
(MWPF_TRUECOLOR565).
The FLTK application shows correctly when compiled and run on suse linux
(ie X windows directly - no microwindows) and even MS windows, so I
think I have to look at nano-X somwhere.
I have tried the latest microwindows and nxlib from CVS today but it
behaves the same.
I have tried changeing wp->background = WHITE in GsInitialize. This
shows a white screen as you would expect, but the white bits (pictures
or any box coloured white) in the FLTK program still show as black.
I would appreciate any hints on how to fix this as apart from that I am
very happy with the results I have so far.
On another note, the mirror of this list on linuxhacker.org seems to not
have updated since wednesday...
Thanks, Darren.

>>> "Greg Haerr" ####@####.#### 07/10/06 23:40 >>>
: The jpg images are displayed with a few portions of the image being
: replaced by the background color.

Make sure you're using the CVS version, previous versions
had issues with WHITE not being drawn, because nano-X
thought it was the transparent color.

What bpp is your hardware, and what bpp are
the png and bmp images?

Regards,

Greg

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Here are 3 patches for nxlib, and two for nano-X,
written by Martin.  The SetClip patch could fix
the problem, no others would be required.

However, I don't yet see how this will fix the single-dot
problems with images.

Regards,

Greg


I had this problem and fixed it and gave Greg the patch.
It was a simple fix but I would need to search for it.
I do not think it is included in the CVS.
Martin

----- Original Message ----- 
From: "Martin Kajdas" ####@####.####
To: "Greg Haerr" ####@####.####
Sent: Friday, September 22, 2006 9:49 AM
Subject: More patches


Greg,

Here are some patches a implemented and sent to you but they are not in CVS.

They fix problems:
- cursor not changing shape
- large images do not display
- images not word aligned swap last byte

Please review these patches and add them to CVS.

Martin

Thanks for the patches guys, but unfortunately I still have the problem.

I thought the problem must be in nxlib somwhere since if I create a normal nano-X application, white shows correctly as white.
So,
	GrSetGCForeground(gc, GR_COLOR_RED); 
	GrSetGCBackground(gc, GR_COLOR_WHITE );
	draw_text("Hello", 95, gc);
produces red text with a white background.

If I write a normal X11 program and link with nxlib (not using FLTK), and do this:
win = XCreateSimpleWindow(display, RootWindow(display,screen),
			  x, y, width, height, border_width,
			  0,
			  0xFFFFFF);
I get black text on a white background, which is correct too.

All 'white' from fltk programs (ie using nxlib) comes out as black though. I'm not sure where to look next at the moment...presumably I'll have to look at what calls fltk makes to nxlib. Any suggestions ?

Darren.

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The patches that we provided had to do with the image problem.
Now you are talking about the text displaying problem.
For that I have two patches (for 5:6:5 mode which I am using and I
believe that you too).
They will have to be modified for other modes than 5:6:5 (16 bit RGB)
Martin






-----Original Message-----
From: Darren Legge ####@####.####
Sent: Tuesday, October 10, 2006 8:58 AM
To: ####@####.####
Subject: RE: [nanogui] Problem regarding image displaying


Thanks for the patches guys, but unfortunately I still have the problem.

I thought the problem must be in nxlib somwhere since if I create a
normal nano-X application, white shows correctly as white.
So,
	GrSetGCForeground(gc, GR_COLOR_RED); 
	GrSetGCBackground(gc, GR_COLOR_WHITE );
	draw_text("Hello", 95, gc);
produces red text with a white background.

If I write a normal X11 program and link with nxlib (not using FLTK),
and do this:
win = XCreateSimpleWindow(display, RootWindow(display,screen),
			  x, y, width, height, border_width,
			  0,
			  0xFFFFFF);
I get black text on a white background, which is correct too.

All 'white' from fltk programs (ie using nxlib) comes out as black
though. I'm not sure where to look next at the moment...presumably I'll
have to look at what calls fltk makes to nxlib. Any suggestions ?

Darren.

Thankyou very much Martin - it worked.
Sorry I may have hijacked this thread but the problem I had related to both text and images so I thought it sounded similar enough.
Anyway I have learned a few things looking into it. Thanks again for the fix.
Darren.

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East Sussex
BN7 2PE
UK

Tel: +44 1273 480667

Email: ####@####.####

####@####.####

We all had these problems and I hope you fix something for me someday.
Keep learning.
Martin

-----Original Message-----
From: Darren Legge ####@####.####
Sent: Tuesday, October 10, 2006 9:42 AM
To: ####@####.####
Subject: RE: [nanogui] Problem regarding image displaying


Thankyou very much Martin - it worked.
Sorry I may have hijacked this thread but the problem I had related to
both text and images so I thought it sounded similar enough.
Anyway I have learned a few things looking into it. Thanks again for the
fix.
Darren.

Dear all,

I tried using the CVS version but am still getting a few problems with
image displaying.

I am just using " microwindows-0.91 ". Is it mandatory to use the
"nxlib-0.44" as well ?
Because so far I have not used it in my applications. My appllications
were running smoothly without installing nxlib( by just installing
microwindows) . If it is mandatory then please suggest me what all
changes I have to make in order to make it work for the framebuffer
configuration.

The CVS version (downloaded direcly from the website) does display
white pixels as white but the transparent features of the bmp files (
which was present previuosly) is lost here.

Also, the jpg images are still displayed with white dots all over the
image, while the same image when converted to bmp format( using gimp
image editor) , is displayed perfectly , without any distortion.

Am I missing something here?

Kindly suggest me some poiters to solve this problem.

Thanks and regards.

Pratish Ganguly