Re: A86: Sprites (More)

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Sprites (More)
From: ZeromusMog@aol.com
Date: Sat, 2 Jan 1999 21:30:03 EST
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org

In a message dated 1/2/99 3:14:42 PM Pacific Standard Time, Jeanne9005@aol.com
writes:

> 	2)  What is the difference in the PutSprite routines?  I have seen them
AND'
> d
>  and XOR'd, but I guess I don't understand the difference.

In an AND sprite, a pixel will be black if one or both of the pixels are
black. For instance, if the the line %10010010 was on top of %01101010, you
would get %11111010. However, in an XOR sprite, a pixel is black only if the
other one is white. The above example would yield %11111000. This is also
called "inverse" because any pixels that are "on" will simply switch the other
pixel.

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