Re: A83: Re: Check this Pixel Routine. =)

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Re: Check this Pixel Routine. =)
From: Jkhum98@aol.com
Date: Sat, 19 Dec 1998 20:57:25 EST
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-83@lists.ticalc.org


Hey Joe (or anybody else who may have some time to) could you elaborate on
that change a little more...?  All I should do is _Insert_ the "CPL" command,
but also leave the "AND (hl)" ?  The function I want to take place is that the
specific Bit will become Cleared no matter what the original byte contained,
but not Every bit in that byte. Will that "AND (hl)" operation do this for me
along with the CPL?  Thanks for the correction though. =)
															--Jason K.

In a message dated 12/19/98 8:04:15 PM, joewing@usmo.com writes:

>Just a minor change, everything else looks like it should work though.
>Sorry about not responding sooner, I just don't much time lately.
>
>Joe Wingbermuehle
>http://www.usmo.com/~joewing/

>> . . .
>>PIXEL_WHITE:
>> ld a, d ; 'a' now has X Coordinate
>> call GETPIX ; Call the Pixel Routine from ZLIB
>
>  cpl  ; compliment output so that we have a pixel mask
>
>> AND (hl) ; 'AND' to clear pixel
>> ld (hl), a ; Write the new byte to Graph Buffer
>> ld a, 0 ; Reload this for use with the CPs above
>> ret
>> . . .

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