forums.ps2dev.org

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

I'm currently working on an app which requires .gif support. Animated preferably, but standard will work too. Problem is that .gif is no longer an open format, which poses a problem, because there isn't a libgif in SVN, and the .gif loader in SDLimage seems quite closely tied to SDL for a standard file - char load.
What i'm asking is: has anybody worked .gif support into a project of theirs, or does anyone know of a way that I could incorporate .gifs into my app without changing the format?

Failing that, does anyone know of any simple libraries that I could port for the PSP?

EDIT: I've found a small loader in a program called iiviewer which may help me. I'd still like to know if this has been done before though

seventoes · Joined: 02 Oct 2005 Posts: 79

well gif is a copywrited technology...

Just open the pix in paint and then save them as a .png and use libpng

Gary13579 · Joined: 15 Aug 2005 Posts: 93

moonlight · Joined: 26 Oct 2005 Posts: 567

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

I'll have a look into ungif, and continue looking at iiviewer. Hopefully it will work OK.

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

Well, that's good news. Do all .gifs use the LZW algorithm, or was it an improvement that Unisys introduced?

EDIT: Seeing as the patents have expired, that means I can use libgif instead of libungif. I can't find libgif (there doesn't seem to be a homepage like for png and jpeg), but I can find libungif.
Is there much difference between libgif and libungif?

Zenurb · Joined: 30 Sep 2005 Posts: 106 Location: United Kingdom

Just convert your GIFs to MNG and use the lovely animated png format instead.
_________________
Proud Dvorak User
US 1.5 PSP (Original)

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

It's not that simple, if I could change the format, then I would. I don't have control over 3rd party images, and .gif is a popular format that I need to support.

moonlight · Joined: 26 Oct 2005 Posts: 567

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

Ok, i'll have a look at libungif in the morning. Thanks.

digihoe · Joined: 14 May 2005 Posts: 108

You need GIF for browser port, right? Are you planing any javascript support BTW? I think it is essential...

Good luck and best regards!

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

Yes. I haven't looked too deep into Dillo's source code yet, if it supports javascript, then the 1.5 browser will too. If not, we'll hopefully build in some basic support, but only for simple essential commands like close() addbookmark() etc, but not good enough for games.
The GU based graphical engine is coming along quite nicely, and it supports .PNG, i'm in the process of adding .jpg. Afterwards, I want to add .gif and TTF support.
I'm just hoping that we'll actually end up with a functioning browser, because if so, the sky is the limit (built-in media view/playing, VoIP, Online Radio stations, flash support etc.).

Zenurb · Joined: 30 Sep 2005 Posts: 106 Location: United Kingdom

shifty · Joined: 16 Jun 2005 Posts: 32 Location: MIT

1) according to
http://www.gnu.org/philosophy/gif.html
the LZW (part of GIF) patent will expire in August 2006! You might as well go
for it in the meantime! Who's going to bother with a few teenagers
with a free distribution over the next year? A good place to find
gif source code is the "xv" source code (a prg for displaying GIFs, jpegs,
etc under the x window operating system). I've ported that code myself
several times. it's pretty clean. The author is pretty wacky. Here's his
webpage: http://www.trilon.com/xv/ And here's the
downloads page for source: http://www.trilon.com/xv/downloads.html

2) Yes, you can have legal GIFs that don't use LZW! They're just not
compressed, so they end up being very big, like 8-bit color indexed
BMP files. I wouldn't waste my time with this though :P

3) no idea if that code is supports animations, but if you get that far, then
I'll dig up my gif animator source code I got from some kid in Germany
for you.

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

seventoes · Joined: 02 Oct 2005 Posts: 79

Wow.. now i look at who started the post and i realize why he cant convert the images xD Im not sure if he wants me revieling his project.. but PSPU put it on the front page so i guess its ok....

Hes workin on a web browser :D *happy happy*

I know he already has png, jpeg, and ttf (fonts) support, i dont know about anything else but i know its coming along well.

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

OK, well. I've got the latest source of libungif. I've made the library and installed it to the library directory. Putting -lungif in the makefile works, and my app can find the gif_lib.h file. However, I get undefined references to the library functions, such as DGifOpenFilename(). The structs work fine (e.g. GifFileType), it's just the functions.
Can anyone help?

daurnimator · Posted: Sat Feb 18, 2006 6:40 pm Post subject:

How did you go with this?

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

Well, it appears that libungif will compile the library fine (with errors elsewhere, but the library is formed OK), but it doesn't link correctly, and gives me errors like: undefined reference to 'DGifOpenFileName'
I'm sure i've seen this problem before with libraries, but I have forgotten how to solve it.

.: Smerity :. · Joined: 04 Feb 2006 Posts: 9

Doesn't that usually mean that the Makefile hasn't been told to link the library, thus isn't finding the reference functions?

Not sure what the signifier would be for libungif though...

-lgif or -lungif maybe?

(and just for curiosity sakes, have you ported over libungif yourself, or is it at an SVN somewhere? Can't see it on svn.pspdev.org)

-Edit-
Confirmed as -lungif at http://mail.gnome.org/archives/gnome-list/1998-December/msg01803.html

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

Makefile:
TARGET = browser
OBJS = main.o p_sprint.o

INCDIR = "/home/Paul/pspgames/freetype/include"
CFLAGS = -O2 -G0 -Wall -I../curl/include -L../curl -I../libungif/lib -L../libungif/lib/.libs
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)

LIBDIR =
LDFLAGS =
LIBS= -lcurl -lpsp_req -lpspdebug -lpspsdk -lpspwlan -lpspnet_apctl -lpspnet_resolver -lc -lpspnet_inet -lpspnet -lstdc++ -lpspgum -lpspgu -lpng -ljpeg -lungif -lz -lm -lfreetype -lpsppower

I'm pretty sure that i'm including the library and neccessary headers.
libungif.a comes out as 202kb, FYI, just in case it isn't compiling fully.

Also, in the .libs directory, there is a dgif_lib.a file, which may need to be included, but I don't know what it's signifier would be.

EXTRA_TARGETS = EBOOT.PBP
PSP_EBOOT_TITLE = Eclipse
PSP_EBOOT_ICON = "icon0.png"
PSP_EBOOT_PIC1 = "eclipsebg.png"

PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak

EDIT: I found somewhere that you can fix this problem by adding exern "C" around the #include <gif_lib.h> but that doesn't help me, as I am already in C, not C++

.: Smerity :. · Joined: 04 Feb 2006 Posts: 9

Not exactly sure what to suggest then.

Check your libungif source to make sure that DGifOpenFileName is in dgif_lib, it seems they excluded it for the GBA version (just incase you're using the GBA tree).

- When Compiling for Game Boy Advance, file functions are not needed so
exclude DGifOpenFileName(), DGifOpenFileHandle(), DGifSlurp(), and
PrintGifError().

http://cvs.sourceforge.net/viewcvs.py/libungif/libungif/lib/dgif_lib.c?rev=1.1.1.1&view=markup

If it's only that single command then it may very well be something to do with the GBA tree, as you'd usually get a lot more errors from a completely missing lib I'd assume

Checking out other probable causes now

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

Any DGif function causes the undefined reference, so I also get the same error with DGifGetRecordName DGifCloseFile DGifGetScreenDesc DGifGetLine. So it clearly can't find any of the functions, which would suggest a missing library, but it's definitely -lungif, and my makefile is pointing to the directory where it is: -L../libungif/lib/.libs
I know it can find the .h files, as it doesn't complain about using the structures such as GifFileType *gifFile; GifRecordType *gifType; GifPixelType *gifLine;

.: Smerity :. · Joined: 04 Feb 2006 Posts: 9

http://mail.gnome.org/archives/gnome-list/1998-October/msg01246.html

He said that he worked around it using -lgif...

He seems to be getting all the same errors as you

The reply quotes -
Hmm: this sometimes happens because you ran "./autogen.sh" before you
had the gif library installed, and then you installed the gif library
but did not remove config.cache in imlib.

<I should also apologise, at this point I'm clutching at straws...>

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

I think that reply was in relation to imlib, so he ran the ./autogen.sh for imlib without having the libungif libraries installed.
If I put in -lgif, the linker complains that it cannot find it.

EDIT: And in response to your earlier question, I got libungif from it's homepage, and compiled it straight off. As I said, it compiled the library fine, but errored out later on with example sources (I think). When compiling the library, there isn't anything particular you need to do to get it to compile for the PSP, is there?

.: Smerity :. · Joined: 04 Feb 2006 Posts: 9

Yeah, sorry mate, if I suggested anything else now I'd be completely clutching at straws. Hopefully someone with more experience in this area can come in and be a hero.

Best of luck...

MikeDX · Joined: 19 Oct 2005 Posts: 30

AnonymousTipster · Joined: 01 Jul 2005 Posts: 197

Can anyone help with this?
It is crucial that the browser has .gif support, and to do so, I need this library.