From:	"Jose Agustin Vericat" <frodobolson AT redestb DOT es>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: 16bpp PutPixel
Date:	1 Sep 1997 23:30:54 GMT
Organization:	Unisource Espana NEWS SERVER
Lines:	26
Message-ID:	<01bcb72a$bda13760$LocalHost@jose>
References:	<19970816190400 DOT PAA15010 AT ladder02 DOT news DOT aol DOT com>
NNTP-Posting-Host:	ppp77.80.redestb.es
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

You only need to rotate the colors, using this function:

int makecol16 (int r, int g, int b)
{
   return (((r>>3) << r_shift) |
             ((g>>2) << g_shift) |
             ((b>>3) << b_shift));

The r_shift, g_shift and b_shift are the position of these colors in the
packed 16 bits color mode. Usually they are 0 for b_shift, 5 for green and
11 for red, but if you want to be sure, use the values given by the VESA
driver.

Hope that this helps!

Jose Agustin Vericat a.k.a. frodobolson

> Hi,
> 
> I'm having trouble getting a putpixel function to work in VESA2 16bpp
> modes. My program uses 24bpp internal rendering, and so I would
appreciate
> if someone could post a 24->16bpp converter. Thanks in advance.
> 
> Gingko
> 

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