From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
Date: Fri, 15 Sep 2000 08:47:36 +0000
From: "Douglas A. Gwyn" <DAGwyn@null.net>
Message-ID: <39C1A2CB.FE8E881F@null.net>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
References: <20000915020412.AA23219A01@mail>
Subject: Re: [9fans] new versions of graphics programs?
Topicbox-Message-UUID: 07f9c288-eac9-11e9-9e20-41e7f4b1d025

Russ Cox wrote:
> Someone set me straight.

The idea is to obtain perfect visual effect.
If you have ever "rubber-banded" on a bitmap display
where the rubber-banding was done via XORing,
you must have seen that it was hardest to make out the
object being manipulated just when the finest control
was needed (slow, small movements).
And if you have ever seen single-buffered animation
running wide open, you must have seen the visual
artifacts of beating with refresh rate, or when
VBL sync was used, suddenly exceeding the frame time.
What one wants ideally is the effect of a genuine
stroke-refresh display, using raster technology.
If you can do that without double-buffering, good.