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Re: [Qemu-devel] Reducing X communication bandwidth

From: Johannes Schindelin
Subject: Re: [Qemu-devel] Reducing X communication bandwidth
Date: Sun, 11 Jul 2004 11:53:28 +0200 (CEST)


On Sat, 10 Jul 2004, Julian Seward wrote:

> The attached patch against sdl.c fixes this.  It keeps a shadow
> copy of video memory.  When a request arrives at sdl_update()
> to redraw an area, the area is compared against the shadow copy,
> and only the parts that have really changed are passed to
> SDL_UpdateRect().  The comparison is done at a granularity of
> 32x32 chunks of pixels.

Why does this remind me of VNC? In fact, that kind of application is the
exact reason I started my VNC patch. It could also be useful as a Windows
98 Terminal Server...


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