From:	"Steve Patton" <leaphe AT softhome DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Error, and more...
Date:	Thu, 28 May 1998 15:27:52 -0600
Organization:	AT&T WorldNet Services
Lines:	101
Message-ID:	<6kkko9$jjb@bgtnsc02.worldnet.att.net>
References:	<3 DOT 0 DOT 5 DOT 32 DOT 19980528163406 DOT 0079ee10 AT wcnet DOT org>
NNTP-Posting-Host:	12.67.33.93
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Joseph Schroeder wrote in message
<3 DOT 0 DOT 5 DOT 32 DOT 19980528163406 DOT 0079ee10 AT wcnet DOT org>...
>  I have several questions for you all... That I cannot figure out how to
>slove or do.  First,  can allegro display gifs or animated gifs?

Allegro does not come with tools to do that, if you write the code, you can
make your own procedure to load and display a GIF or animated GIF, however,
(as quoted from the FAQ.TXT that comes with Allegro)

      Unisys has a patent on the LZW compression algorithm that is used by
      the GIF format. I want everything in Allegro to be freely usable
      without any restrictions whatsoever, which means I can't include any
      code that is subject to licencing or the payment of royalties.

>Second, when i put in c++ commands... I try to actually make the .o file
>into an .exe, it gives me a bunch of errors, and it cant find a library
>called stdcx
>full error |
>           v
>Error: c:/djgpp/bin/ld.exe: cannot open -lstdcx: No such file or directory
>(ENOENT)


Chances are you did not download or correctly install _ALL_ of the C++
Libraries.. go to here

http://www.rt66.com/~brennan/djgpp/

and get the following files

gpp2721b.zip
lgp271b.zip

Chances are you are missing the LGP271b.zip, which contains the libraries

>Third, When i use the code for displaying a BMP file...  (
>
>main()
>{
> BITMAP *bmp;
> RGB pal[256];
>
> allegro_init();
> set_gfx_mode(GFX_AUTODETECT,800,600,0,0);
>
> bmp=load_bitmap(filename,pal);
> blit(bmp,screen,0,0,0,0,bmp->w,bmp->h);
>}
>
>)  ... It seems that i can only display one bitmap to the screen at a
>time... could i change that?  And... could I make it so all you would do is
>set a varible, perhaps named image and set it to a specific bmp name, so
>that you would only have to make it goto a sub with a variable set to
>display a bitmap.

Another quote from the FAQ.TXT

   How can I display several different images at the same time? When I show
   the second one it messes up the palette for the first.

      That is how the video hardware works: there can only be one palette in
      use at any given moment. Either convert your images so that they all
      use the same palette (see the Allegro homepage for some utilities that
      can help with this...) or switch to a truecolor graphics mode.


And I'm not too sure what you are asking about the variable, but you could
try this

void Display ( char *filename )
 {
    BITMAP *bmp;
    PALETTE pal;

    bmp = load_bitmap ( filename, pal );
    clear ( screen );
    set_palette ( pal );
    blit ( bmp, screen, 0, 0, 0, 0, bmp->w, bmp->h );

    destroy_bitmap ( bmp );
 }


If you wanted to call a procedure to display a filename.



>Fourth, Are there any other good libraries like allegro out there?  Ive
>tried a couple... but I have never gotten them in correctly...

My opinion is that Allegro is a good multipurpose library that will easily
let you interface with graphics, sound, input, and such.  There are other
libraries that are free that are made for Allegro.  The other libraries I've
seen are pay for us.  But go to http://www.rt66.com/~brennan/djgpp/ because
he has some other good libraries up on his page that you can try out.

-Steve
http://home.att.net/~pattonl

- Raw text -