Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!canon!laukee
From: laukee@canon.co.uk (David Lau-Kee)
Newsgroups: comp.lang.smalltalk
Subject: Re: Smalltalk coordinates to screen coordinates
Message-ID: <1990Nov1.185826.9326@canon.co.uk>
Date: 1 Nov 90 18:58:26 GMT
References: <1089@dcl-vitus.comp.lancs.ac.uk>
Reply-To: laukee@canon.co.uk
Organization: Canon Research Europe, Guildford, UK
Lines: 23

dik@comp.lancs.ac.uk (Mr R. M. Bentley) writes:

[ stuff about displaying colour images in PPS 2.5
  Q. does one get st's pixrect or frig a window offset, and how? ]

Well, what you ought to do is grab Smalltalk's window offsets direct and use
those.  You also need the colour map info to hand.  When I did something
similar I couldn't figure out how do this properly, so I frigged it (your
option 1).  Note that you'll also need to replicate the standard bitblt
(since Smalltalk will assume it can just toggle LSB for black/white), *and*
set up the colour map to have every other entry black (to get the cursor
functioning over the deep parts).  I'm sure there's an easier way, still
this was just a "design as you type" exercise .

I'll mail you some code to get you started.

-------------
David Lau-Kee
Canon Research Centre Europe,
17/20 Frederick Sanger Rd, Surrey Research Park, Guildford, Surrey, GU25YD, UK.
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