From:	Jonathon Ralston <j DOT ralston AT cat DOT csiro DOT au>
Newsgroups:	comp.os.msdos.djgpp
Subject:	[Q]: Allegro scrolling question
Date:	Fri, 01 Aug 1997 15:12:02 +1000
Organization:	CSIRO
Lines:	18
Message-ID:	<33E17022.102F@cat.csiro.au>
Reply-To:	j DOT ralston AT cat, csiro DOT au AT delorie DOT com
NNTP-Posting-Host:	mcfly.cat.csiro.au
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hello Allegro programmers!

I wanted to write a 640 x 480 x 256 horizontal scrolling program, like
the ex19.c demo. I increased the screen bitmap size and changed the
other screen size variables accordingly.  However, I found that
*everything* on the screen was scrolled, including the text line.

Is it possible to scroll only *part* of the screen while in an SVGA
mode, e.g., a 640 x 400 window?  I noticed that ex19.c uses a mode X
modex_split type function.  Does this mean that the split screen
text/scrolling only exists in mode X?  Is there a version of
scroll_screen() that scrolls only part of the screen, or a BITMAP
buffer?

Any pointers would be greatly appreciated.

Jonathon.
j DOT ralston AT cat DOT csiro DOT au

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