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From: mcdonald@uxe.cso.uiuc.edu
Newsgroups: comp.sys.ibm.pc
Subject: Windows/graphics query
Message-ID: <45900081@uxe.cso.uiuc.edu>
Date: Tue, 13-Oct-87 14:52:00 EDT
Article-I.D.: uxe.45900081
Posted: Tue Oct 13 14:52:00 1987
Date-Received: Fri, 16-Oct-87 01:52:00 EDT
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Nf-ID: #N:uxe.cso.uiuc.edu:45900081:000:1163
Nf-From: uxe.cso.uiuc.edu!mcdonald    Oct 13 13:52:00 1987


Reading various articles about Microsoft Windows and the "presentation
manager" of OS/2 seems to indicate that screen writing must go through
a canned device driver. Since most pc's running these programs will
be using EGA's or VGA's I would have assumed that the driver would provide
pretty complete support for their features. I am particularly referring
to the ability to swap pages, to write to one bit plane while not effecting
others by setting the mask register, and the ability to change colors
quickly using the palete registers, and also the choice of direct, OR,
AND, or XOR writing. I don't see reference to any of this in the calls
I have seen listed. Are the descriptions I have seen simply incomplete,
or have these things actually been left out. As most of my pc programs
use animation, whose smooth functioning depends on all of the above, it
would seem that they wouldn't work under the new system (except of course
using compatibility mode.) Does anyone know how do animation in the new
environments? I realize that the presentation manager is presently vaporware,
but Windows really exists, so somebody should know the answer.

Doug McDonald