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Article #31804

Degas file format

#31804
From: barry comer
Date: Sat, 09 Apr 1988 21:02
44 lines
2208 bytes
Some people were asking about the Degas picture file format,  well 
here it is:(1 word = 2 bytes)

1 word - Word value is 0=low rez, 1=mid rez, 2=high rez
16 words - colour palette, standard st bios format
16000 words - raw pic data

The  following are optional:(added to the normal degas format  for 
                             Degas Elite) 

4 words - Left animation limit table
This is a table of 4 words values which specify the left limits 
of  each of the four colour animation channels.  The values  range 
from 0-15,  indicating that the corresponding colour palette entry 
is the left range of the animation channel's range.

4 words - Right animation limit table
Same as the one for left, but this value should be greater than or 
equal  to the corresponding left animation limit value for  proper 
operation.

4 words - Animation channel direction flag
This  is  a  table  of 4 word values  which  specify  the  cycling 
direction  for the corresponding animation channel.  A value of  0 
indicates  that  the  channel shifts its colours  to  the  left,1= 
channel is off, and 2=a right shift.

4 words - Animation channel delay
This  is a 4 word value table which specifies the speed  at  which 
the  colour  registers  in the animation  channel  range  will  be 
shifted. The range of permissible values in these variables are 0-
128,  indicating  the number of 60Hz delay periods between  colour 
shifts.  A  value of zero in this table indicates the  max  speed, 
approx.  60 shifts per second;  a value of 60 is approx. one shift 
per second; a value of 120 is roughly one shift every two seconds.

Well that is the file format for Degas and Degas Elite pics.  As I 
said the bottom 16 words are optional.

later
Barry 

P.S.  Could  someone that has the RTX multi-tasking  prg.,  please 
send me a short review of it.
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!dalcs!aucs!870646c
From: 870646c@aucs.UUCP (barry comer)
Newsgroups: comp.sys.atari.st
Subject: Degas file format
Message-ID: <1041@aucs.UUCP>
Date: 9 Apr 88 21:02:06 GMT
Reply-To: 870646c@aucs.UUCP (barry comer)
Organization: School of Computer Science, Acadia Univ., Nova Scotia
Lines: 44