From:	Jonathon Ralston <j DOT ralston AT cat DOT csiro DOT au>
Newsgroups:	comp.os.msdos.djgpp
Subject:	[Q]: Horizontal scrolling using Allegro
Date:	Thu, 07 Aug 1997 13:58:17 +1000
Organization:	CSIRO
Lines:	19
Message-ID:	<33E947D9.28C0@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
CC:	ralston AT delorie DOT com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hello,

I wanted to write a horizontal scrolling program using allegro in 640 x
480 x 256 resolution. Using ex19.c as a base, 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 in ex19.c you used a
mode X modex_split 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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