Re: [whatwg] Synchronizing Canvas updates in a worker to DOM changes in the UI thread from Kyle Huey on 2013-10-21 (public-whatwg-archive@w3.org from October 2013)

From: Kyle Huey <me@kylehuey.com>
Date: Mon, 21 Oct 2013 10:26:46 +0800
To: Glenn Maynard <glenn@bluegoji.com>
Cc: whatwg <whatwg@whatwg.org>, Kenneth Russell <kbr@google.com>, Robert O'Callahan <robert@ocallahan.org>
Message-ID: <CAP045ArGHsFgPQ7Wb20aeuVJuDzr35ZZ+Hd+yMGW=0bnG8_7_g@mail.gmail.com>

On Sun, Oct 20, 2013 at 11:33 PM, Glenn Maynard <glenn@bluegoji.com> wrote:

> It must not be possible for the UI thread to detect whether present() did
> anything--if there's no frame in the ready buffer, nothing changes and the
> UI thread can't detect this.  Similarly, it must not be possible for the
> rendering thread to detect if the ready frame has been presented.  These
> rules are to prevent exposing asynchronous behavior.
>

Well you can readback from <canvas>es, so how is that going to work?

- Kyle

Received on Monday, 21 October 2013 02:27:11 UTC