From: Darac <You_Know_Who AT NoSpam DOT I DOT Am>
Newsgroups: comp.os.msdos.djgpp
Subject: Size of Loaded Bitmaps in Allegro
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Date: Sat, 22 Jan 2000 17:01:55 +0000
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hello everybody!

I'm making a little program to convert JPGs into BMPs for my Windows
Wallpaper. I've got LIBJPEG 1.03 to load in the JPGs but I was wondering
if it's possible to know how big the loaded file is.

Here's a quick code fragment of what I'm doing:

#inlcude <allegro.h>
#include <jpeg.h>

BITMAP *in_jpeg, *out_bmp;
RGB *in_pal, *out_pal;

int main(){
	allegro_init();

	register_bitmap_file_type("JPG",load_jpeg,save_jpeg);
	register_bitmap_file_type("JPEG",load_jpeg,save_jpeg);

	// Ask user for filename and store it in char *Filename
	.
	.
	.

	set_color_depth(8);	// I want to convert to 256 colors
	set_color_conversion(...All of them...);

	in_jpeg=load_bitmap(filename,in_pal);	// Load JPG
	out_jpeg=create_bitmap(800,600);	// Somewhere to store
	clear(out_jpeg);			// the BMP
	
	stretch_blit(....);			// Squeeze the JPG into 
		// the BMP, letting Allegro do the color conversion, too

and so on.

Now, from what I can tell from the Allegro Docs, load_bitmap will create
the in_jpeg bitmap and load the JPG into it. However, how can I get the
width and height of that bitmap.
Also, I'm assuming that the in_jpeg bitmap will be 24bit (or whatever)
but do I _have_ to go into graphics mode first. I'd prefer to stay in
Text mode all the way through and do all the graphics stuff in memory.

Hope you can help.
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