From owner-freebsd-multimedia  Wed Apr 22 03:53:50 1998
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Date: Wed, 22 Apr 1998 06:50:34 -0400
From: Randall Hopper <rhh@ct.picker.com>
To: Luigi Rizzo <luigi@labinfo.iet.unipi.it>,
        Amancio Hasty <hasty@rah.star-gate.com>
Cc: sos@FreeBSD.ORG, jerry@freeside.fc.net, multimedia@FreeBSD.ORG
Subject: Re: problem capturing video with BT848/Haughpage Win/Tv
Mail-Followup-To: Luigi Rizzo <luigi@labinfo.iet.unipi.it>,
	Amancio Hasty <hasty@rah.star-gate.com>, sos@FreeBSD.ORG,
	jerry@freeside.fc.net, multimedia@FreeBSD.ORG
References: <199804200444.VAA00554@rah.star-gate.com> <199804200321.FAA13667@labinfo.iet.unipi.it>
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In-Reply-To: <199804200321.FAA13667@labinfo.iet.unipi.it>; from Luigi Rizzo on Mon, Apr 20, 1998 at 05:21:06AM +0200
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Luigi Rizzo:
 |> This is a flaw in the current X server protocol model. It can tell you 
 |> what happened now what is about to happened .
 |                ^^^ i assume this is "not"
 |
 |you mean that you know that a window is occluded but don't know what
 |parts of the window are visible and what not ?

Yes, that's an issue, but more importantly you don't get an event when your
window is Partially Occluded and another piece of the then-visable area is
occluded.  You only get events when window occlusion (who's covering me)
changes between:  Totally Unoccluded, Partially Occluded, Completely Occluded.

Short of polling the window list rapidly, there's no way to stay up-to-date.

Then there's the asynchronous nature of X, but I described a bit about that
in a msg last night.

Randall


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