Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga
Subject: Re: LACE Workbench
Message-ID: <5147@well.UUCP>
Date: 3 Feb 88 23:41:55 GMT
References: <5145@well.UUCP>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: (-: ACME Flamethrowers.  Mark Ethan Smith, CEO. :-)
Lines: 34

In article <5145@well.UUCP> shf@well.UUCP (Stuart H. Ferguson) writes:
>What's a good (read: fast/simple) way to detect if the Workbench screen is in
>interlace mode?  I need to do this to compute the aspect ratio for pixels on
>*any* Workbench screen.  Thanx in advance.
>
	Well, you could do this:
--------
	register struct Window	*win;
	UWORD			CRTModes;

	win = OpenWindow (&NewWindow);
	CRTModes = win -> WScreen -> ViewPort.Modes;
--------

	However, this will probably not be very useful when 1.4 (currently
vaporware, and likely to remain that way for a long time yet) comes out.

	If I'm reading Dale's and Jimm's minds correctly, under future
operating systems, you won't be able to make any assumptions about what the
WorkBench screen looks like (case in point: The Hedley (sp?) monitor).

	Dale thought of this already, and somewhere in GfxBase are a couple
of variables called NormalDPMX and NormalDPMY.  These give the DotsPerMetre
measurements of the screen.  You're supposed to calculate aspect ratios from
these.

	Exactly how you do that, I have no idea.  Dale, could you clear that
up?  Personally, I've never understood how those variables worked,
particularly if there are multiple viewports on the screen.

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