Message-ID: <3AB3C404.702291F7@home.com>
From: Paul Michailidis <paulm14 AT home DOT com>
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Subject: Pallete Problem!
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Date: Sat, 17 Mar 2001 20:08:10 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi Im making some intro screens for my game. Right now I'm working on
the "company" intro screen but I have a colour problem.
I made an image in windows paint. 640 x 480 with 256 colours. The
background consists of a black background with grey lines. I blited that
to the screen. I set the palette and everythings fine.
I then made the logo in a program called DDTitle which has a depth of 24
bits (tried converting to 256 colour, still same problem). Anyway I
converted it to a windows bitmap and it looks good. Now when I try to
blit the logo onto the background the logo's colours are fine but the
background is screwed up. the black turns into blue and the grey turnes
into some colour i forget. The logo's colours are fine. I tried it with
the images using the same palette and again with separate palettes. No
difference. Here's the code

#include <iostream.h>
#include <stdlib.h>
#include <stdio.h>
#include "allegro.h"

#define MAXX 640
#define MAXY 480

BITMAP *ImgTitle;
BITMAP *ImgBack;
BITMAP *ImgLogo;
PALLETE PalTitle;

int ErrVmode;

int main(int argc, char *argv[])
{
    allegro_init();
    install_keyboard();
    install_timer();

    ErrVmode=set_gfx_mode(GFX_AUTODETECT, MAXX, MAXY, 0, 0); // change
autodetect
    if (ErrVmode != 0 )
    {
        printf("Error setting graphics mode\n%s\n", allegro_error);
        allegro_exit ();
        return 1;
    }
    ImgBack = load_bitmap("Data\\4-SBack.bmp", PalTitle);
    ImgLogo = load_bitmap("Data\\4-SLogo.bmp", PalTitle);
    if (!ImgBack||!ImgLogo)
    {
        printf("Error reading bitmap");
        allegro_exit ();
        return 1;
    }

    set_pallete(PalTitle);
    ImgTitle=create_bitmap(MAXX, MAXY);
    clear(ImgTitle);
    do
    {
        blit(ImgBack, ImgTitle, 0, 0, 0, 0, MAXX, MAXY);
        // some work with pixel animation then blitting to ImgBack
       blit(ImgTitle, screen, 0, 0, 0, 0, MAXX, MAXY);
    } while (!key[KEY_ESC]);
    clear_keybuf();
    do
    {
        blit(ImgBack, ImgTitle, 0, 0, 0, 0, ImgBack->w, ImgBack->h);
        blit(ImgLogo, ImgTitle, 0, 0, (MAXX/2) - (ImgLogo->w/2), MAXY/4,
ImgLogo->w, ImgLogo->h);
        blit(ImgTitle, screen, 0, 0, 0, 0, MAXX, MAXY);
    } while (!key[KEY_ESC]);
    fade_out(2);
    destroy_bitmap(ImgTitle);
    allegro_exit();
    return 1;
}


Please help guys!!!

Thanks,
Paul M.