Path: utzoo!utgpu!jarvis.csri.toronto.edu!me!radio!brian
From: brian@radio.toronto.edu (Brian Glendenning)
Newsgroups: comp.graphics
Subject: Fast Zoom for Suns
Message-ID: <1054@radio.toronto.edu>
Date: 28 Mar 88 15:24:49 GMT
Reply-To: brian@radio.toronto.edu (Brian Glendenning)
Organization: Radio Astronomy, Dept. of Astronomy, U. of Toronto, Canada.
Lines: 34

[My apologies if you've already seen this, but I'm pretty sure it got lost
 in-campus]

Does anyone have a piece of code to do a fast zoom to a window under suntools?
I have a program that acts as a graphics server to a large astronomy package,
and every last little bit of speed will be felt.


What I'm now doing is stepping through the image a line at a time, zooming that
line into a temp array by "hand", and then pw_rop'ing the zoomed line into the
screen. That is:


                                       111000111000111000111000111000
1010101010101010  Zoom by 3 (say) ---> 111000111000111000111000111000 -> pw_rop
                                       111000111000111000111000111000

(original image line)                        (zoomed temp array)



While this is a lot faster than some of my earlier efforts, I thought I'd ask
if anyone had any really fast code, or suggestions. For instance, I'm doing an
incore transfer that in principle isn't necessary if I wrote to screen memory,
but I'm not quite sure how to do that, especially if one wants to worry about
overlapping windows etc. My code now takes a couple of seconds to zoom the full
screen (colour sun 3/180).

Any advice, programs, or code fragments would be much appreciated. Thanks.

-- 
Brian Glendenning                INTERNET - brian@radio.toronto.edu
Radio Astronomy, U. Toronto          UUCP - {uunet,pyramid}!utai!radio!brian
+1 (416) 978-5558                  BITNET - glendenn@utorphys.bitnet