From:	Endlisnis <s257m AT unb DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: displaying a bmp
Date:	Thu, 13 Aug 1998 12:33:42 -0300
Organization:	NBTel Internet
Lines:	40
Message-ID:	<35D30756.63EEF1F3@unb.ca>
References:	<35D2B912 DOT 3F40D6C8 AT xyz DOT net>
NNTP-Posting-Host:	fctnts10c46.nbnet.nb.ca
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Bjorn Hansen wrote:

> void set_mode(int mode)
>      {
>      __dpmi_regs r;
>      r.x.ax = mode;
>      __dpmi_int(0x10, &r);
>      };
>
> void main()
> {
>  char smiley[320*200];
>  FILE *pict= fopen("C:\\Cstuff\\smibm.bmp","rb");
>  set_mode(VGA_13h);
>
>  dosmemput(pict+128,320*200,0xA0000);
>  while(!kbhit());
>  set_mode(TEXT);
> }

1]    Your set_mode function should have a line like:
      memset(&r, 0, sizeof(r));
      or you might get unexpected (and undesired) results occationally.

2]    All you've done is open the file, you never read any data from it.
3]    Bitmap files are not just a series of pixel values, they have many
different possible     styles (and bit-depths), and some are even
run-length
encoded and stuff like that.  You can't just read it directly to the
screen,
you have to interpret the data.  And you also have to worry about palettes.

4]    I think that bit-maps are stored back-wards or up-side-down (I can't
remember which).

--
     (\/) Endlisnis (\/)
          s257m AT unb DOT ca
          Endlisnis AT GeoCities DOT com
          Endlis AT nbnet DOT nb DOT ca

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