From:	"Tony O'Bryan" <aho450s AT nic DOT smsu DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Accessing BITMAP *bmp under DJGPP
Date:	Thu, 08 Jan 1998 13:33:06 -0600
Organization:	Southwest Missouri State University
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Message-ID:	<34B529F2.77B@nic.smsu.edu>
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To:	djgpp AT delorie DOT com
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Dave Nugent wrote:

> some of the Allegro graphics functions.  Is there a way I can use
> the BITMAP setup and still allow my routines to draw in this array?
> Or is there a way I can point BITMAP *bmp to my buffer?  Or does it
> have to be created through create_bitmap?

The BITMAP structure contains two ways to directly access the bitmap
memory.  You can use the void *data pointer or the unsigned char
*line[0] pointers.  The data pointer points to the first byte of the
linear bitmap memory, and the line[] pointers point to the first byte of
each scanline.  line[0] and data both point to the first byte of the
buffer, so take your pick which one you want to use.  They both are
useful for different approaches.
-- 
Tony O'Bryan

http://www.geocities.com/SiliconValley/Park/7201

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