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Path: ulowell!miner
From: miner@ulowell.cs.ulowell.edu (Richard Miner)
Newsgroups: mod.computers.apollo
Subject: Need help doing pixels reads/writes on a DN660s, 560s, 550s...
Message-ID: <955@ulowell.cs.ulowell.edu>
Date: 19 Jan 87 16:01:58 GMT
Organization: University of Lowell
Lines: 29

We are moving a device independent image processing environment from 
micros to the Apollos and are having a few problems.   The system has
three main functional areas that we would display simulataneously:
a command line, a menu, and a window with the image.  We would like
to do this with Apollo windows in display mode.  The problem is that there 
does not seem to be any way to read and write individual pixels to a
window in display mode.   According to the manuals this can only be done
in imaging mode with the display in borrow mode.   This unfortunately means
no Apollo windows can be used and we would need to do ALL window management
ourselves.

Is there some sort of library where we can manipulate the bitplane layers
of a display window ourselves?

Finally, even in imaging mode, block transfers are quick, but individual 
pixel reads/writes are VERY S-L-O-W.   A program to copy a 512x512x24
image using pixel reads/writes took over 15minutes on a DN660, it was a
two line loop reading and writing??   I suppose one problem was the 24 bits
deep (which we do not need) but it still took too long.  Can we get into
1024x1024x8?  Documents seem to indicate we cannot.




-- 
Rich Miner   ...!wanginst!ulowell!miner
Ulowell, Center for Productivity Enhancement        (617) 452-5000 x2693
HAL hears the Amiga9000 series is not selling. "Please explain Dave. Why 
aren't Amiga9000's selling?" Bowman hesitates, "You aren't IBM compatible."