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From: ief@geocub.UUCP
Newsgroups: comp.sys.apollo
Subject: Pixels in main memory gpr bitmaps
Message-ID: <132@geocub.UUCP>
Date: Fri, 8-May-87 00:50:01 EDT
Article-I.D.: geocub.132
Posted: Fri May  8 00:50:01 1987
Date-Received: Sat, 9-May-87 07:59:15 EDT
Organization: Greco-Programmation, Bordeaux. France
Lines: 13

gpr-$write-pixels :

 I am using binary pictures, represented as gpr single plane bitmaps and
char arrays. In my package, I have to pack and unpack from one data type to the
other : for this purpose I amusing gpr-$write-pixels and gpr-$read-pixels. 
All bitmaps are main memory bitmaps.
Apparently, gpr-$xxx-pixels nead a long array and a bitmap, and this is very costly
for big pictures, and is needed just for packing.
Thus, I would like to write my own packing routine : can anyone explain me
how are the pixels rpresented in main memory bitmaps ?

         p.Garda
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