From: "Thomas Harte" <T DOT Harte AT btinternet DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: graphics
Date: 28 Dec 1996 22:39:43 GMT
Organization: Dell Computer Corporation
Lines: 19
Message-ID: <01bbf50f$5ce75680$d42649c2@default>
References: <1 DOT 5 DOT 4 DOT 16 DOT 19961218230509 DOT 19f7ab66 AT mail DOT algonet DOT se> <32c3e184 DOT 1226804 AT news DOT eunet DOT fi>
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To: djgpp AT delorie DOT com
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Aleksi Kallio <aleksi AT kalliot DOT pp DOT fi> wrote in article
<32c3e184 DOT 1226804 AT news DOT eunet DOT fi>...
[cut]

> Then draw pixels in this way:
> #include<go32.h>
> #include<sys/farptr.h>
> _farpokeb(_dos_ds, 0xA0000+y*320+x, color);

	Instead of multiplying by 320, I suggest you use two bit-shifts, therefore
changing the line to :-

	_farpokeb(_dos_ds, 0xA0000 + (y << 8) + (y << 6) + x, colour);

	. . . .as this is faster.

		-Thomas