From: Tom St Denis <stdenis AT compmore DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: BITMAP info
Date: Sun, 28 Jan 2001 03:20:15 GMT
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In article <3a7384c5_1 AT corp DOT newsfeeds DOT com>,
  "23yrold3yrold" <cbarry AT pangea DOT ca> wrote:
> "Norberto Alfredo Bensa" <ceo AT nbensacomputers DOT com> wrote in message
> news:OE24CKDkb9pPFR6sKBE000007e1 AT hotmail DOT com...
> > Hello
> >
> > From: "23yrold3yrold" <cbarry AT pangea DOT ca>
> > >
> > > Well, look at that. But what about the create_bitmap() functions and
> all?
> > > I want to know how to write my own ....
> >
> > Take a look at allegro/src/graphics.c, bmp.c, blit.c
>
> Nope. Although from getting a little deeper in the files, it seems blitting
> and such requires assembly to access screen coordinate values. True?

You can draw to memory bitmaps (or linear screens) using screen->line[0] as a
pointer to a series of pixels.

or

BITMAP *bmp;
bmp = create_bitmap(16, 16);

*((unsigned char *bmp->line[0])+1) = makecol(0,0,255);

Sets the second pixel to red.

Tom


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