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Mail Archives: djgpp/1997/06/06/11:54:41

From: "Smith A. Cat" <imbe AT primenet DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Easy to answer Graphics Quetion
Date: 5 Jun 1997 19:34:01 -0700
Organization: Blue Square Laboratories
Lines: 74
Message-ID: <33977515.7612@primenet.com>
References: <01bc71d7$9375a7c0$6f1cd6cc AT chia>
MIME-Version: 1.0
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

This is a multi-part message in MIME format.

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Chia wrote:

> I am rather new to this and only have got the compiler to work a couple
> days ago.  I can make some really nice graphics with some various programs
> and would like to be able to put them into either C or C++ code. I've been
> trying to figure it out on my own but all I can find is long sets of code
> and I haven't seen how I can just display an image.  Is there a way to just
> take a .bmp or any other kind of file and display it?  Thanks!

Allegro comes with an example program, i think ex15.c:

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/* 
 *    Example program for the Allegro library, by Shawn Hargreaves.
 *
 *    This program demonstrates how to load and display a bitmap file.
 */


#include <stdlib.h>
#include <stdio.h>

#include "allegro.h"


int main(int argc, char *argv[])
{
   BITMAP *the_image;
   PALLETE the_pallete;

   if (argc != 2) {
      printf("Usage: 'ex15 filename.[bmp|lbm|pcx|tga]'\n");
      return 1;
   }

   /* read in the bitmap file */
   the_image = load_bitmap(argv[1], the_pallete);
   if (!the_image) {
      printf("Error reading bitmap file '%s'\n", argv[1]);
      return 1;
   }

   allegro_init();
   install_keyboard(); 
   set_gfx_mode(GFX_VGA, 320, 200, 0, 0);

   /* select the bitmap pallete */
   set_pallete(the_pallete);

   /* blit the image onto the screen */
   blit(the_image, screen, 0, 0, (SCREEN_W-the_image->w)/2, 
		     (SCREEN_H-the_image->h)/2, the_image->w, the_image->h);

   /* destroy the bitmap */
   destroy_bitmap(the_image);

   readkey();
   return 0;
}

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