[comp.sys.apollo] Pixels in main memory gpr bitmaps

ief@geocub.UUCP (05/08/87)

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
           UUCP : ...!seismo!mcvax!inria!geocub!ief