Re: A83: Moving Backgrond...

To: James Matthews <assembly-83@lists.ticalc.org>
Subject: Re: A83: Moving Backgrond...
From: Linus Akesson <lairfight@softhome.net>
Date: Fri, 17 Jul 1998 18:26:10 +0100
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <199807170457.NAA21355@tkb.att.ne.jp>
Reply-To: assembly-83@lists.ticalc.org

On 17-Jul-98, James Matthews wrote:

>So, how do you store a massive background file in a program?  Or do people
>simple repeat backgrounds?

>Thanks.

>James.

Um, what exactly do you mean with massive background? Normal 96*64 pictures
can be stored as the 768 bytes to copy to the graph buffer. Storing something
like background maps for games is of course stored in 1 byte per 8x8
block, and then there's a graphics bank somewhere with the image data for
each (allowed) byte in the maps. Then you copy the 8 bytes (8x8 pixels) from
the graphics bank to the graph buffer, and loop back to do the other blocks
in the map.

Linus

References:

A83: Moving Backgrond...

From: "James Matthews" <matthews@tkb.att.ne.jp>