[whatwg] Hardware accelerated canvas

Kornel Lesiński kornel at geekhood.net
Tue Sep 4 11:51:00 PDT 2012

On Tue, 04 Sep 2012 17:43:11 +0100, Boris Zbarsky <bzbarsky at mit.edu> wrote:

> 5)  Save command stream.
> 6)  Have a way for pages to explicitly snapshot a canvas.
> 7)  Require opt in for hardware accelerated rendering.
> Any others?
> Of the above, I don't think #5 and #7 are realistic, for what it's  
> worth.  I haven't put enough thought into the rest yet to decide what I  
> think about them.

Would a mix of #5 and snapshotting work?

1. create a (fixed-size?) append-only buffer for drawing commands,
2. log all drawing commands until the buffer is full or a  
non-cheaply-serializable command (e.g. draw of <video>) is executed,
3. snapshot,
4. empty the buffer
5. goto 2

That could make readbacks much less frequent. Would this still be a  
prohibitively expensive solution?

regards, Kornel

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