Path: utzoo!mnetor!uunet!steinmetz!ge-dab!codas!killer!ltf
From: ltf@killer.UUCP (Lance Franklin)
Newsgroups: comp.sys.amiga
Subject: Re: LACE Workbench (and more questions)
Message-ID: <3221@killer.UUCP>
Date: 5 Feb 88 04:26:52 GMT
References: <5145@well.UUCP>
Reply-To: ltf@killer.UUCP (Lance Franklin)
Organization: The Unix(R) Connection BBS, Dallas, Tx
Lines: 37
Keywords: .tech

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.
>
>-- 
>		Stuart Ferguson		(shf@well.UUCP)
>		Action by HAVOC		(shf@Solar.Stanford.EDU)

Hmmm...There may be an easier way (Perhaps something in IntuitionBase or
GfxBase), but I generally do a call to GetScreenData (with WBENCHSCREEN as
the screen_type parameter) and look at the Screen.Height member of the
structure...if it's greater than the maximum size of a non-interlaced screen
(what, 263 lines?), I assume it's an interlaced screen.  This is also how I
get the information I need to open a window to the full size of a morerow'd
workbench.
 
Here's another question....how do I, when working with an interlaced screen,
figure out whether I'm starting an even or odd scan when I call WaitTOF()?
A ScrollRaster does some really interesting things on an interlaced screen
when you do it EVERY WaitTOF().
 
Oh, and one more question...is there an approved way to open a window with
less planes inside the window than there is in the borders?  f.i. a window
with two planes for the border, but only one plane in the drawing area inside
the window?
 
Thanx



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