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From: Klaas <klaas AT ns DOT sympatico DOT ca>
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Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problems with allegro
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Date: Sun, 15 Aug 1999 13:12:15 -0300
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Al Morgan wrote:
> 
> I've gotten some basic stuff to work using allegro, Mode-X graphics (i still
> haven't gotten that to work without using a 3rd party library, grrr...) ,
> keyboard, mouse, and I've been able to load bitmaps and draw them on the
> screen.  The problem is when I tried to set the palette, beacuse my picture
> was turning out all wrong colors, but when I did, it gave an error (copied
> below my program).  Is it me, or is it my computer that has a problem?
> 
> #include <allegro.h>
> #include <conio.h>
> 
> void main()
>     {
>     allegro_init();
>     install_keyboard();
>     install_mouse();
> 
>     set_gfx_mode(GFX_MODEX, 320, 240, 320, 480);
> 
>     PALETTE *p;

It's usually easier to not use pointers with palletes in Allegro.


>     BITMAP *belive = load_bmp("c:\\belive.bmp", *p);  // mulder's "I want to
> belive" poster

For example, here you are passing trash from an uninitialized pointer to
load_bmp, intead of a pointer variable.  Just do this:

PALLETE pal;
BITMAP *bmp=load_bmp("bmp.bmp",pal);

>     set_palette(*p);  // HERE'S WHERE THE PROBLEM IS

set_pallete(pal); 

> 
>     draw_sprite(screen, belive, 0, 0);
> 
>     getch();
> 
>     destroy_bitmap(belive);
>     allegro_exit(); // i know i don't need it, but i'm paranoid
>     }


Btw, you can use pointers with palletes, though I find that it usually
isn't worth the trouble.  Especially since the minimum block size in
DJGPP is something like 4k (?) so you will be wasting memory when you
malloc a chunk.

Bbtw, it's "believe" :)

-Mike