- From: Kenneth Russell <kbr@google.com>
- Date: Wed, 8 Apr 2015 14:44:09 -0700
- To: "Robert O'Callahan" <robert@ocallahan.org>
- Cc: Ian Hickson <ian@hixie.ch>, Jake Archibald <jaffathecake@gmail.com>, WHATWG <whatwg@whatwg.org>
On Tue, Apr 7, 2015 at 6:42 PM, Robert O'Callahan <robert@ocallahan.org> wrote: > On Wed, Apr 8, 2015 at 11:41 AM, Kenneth Russell <kbr@google.com> wrote: >> >> I apologize for taking so long to update this proposal, but it's now >> in a reasonable state: >> https://wiki.whatwg.org/wiki/OffscreenCanvas >> >> (Renamed per feedback from Anne -- thanks.) >> >> Please offer your feedback. Multiple browser implementers agreed on >> this form of the API at a recent face-to-face meeting of the WebGL >> working group, and the proposal should be able to address multiple use >> cases. I'm very interested in prototyping it to see if it can offer >> better parallelism. > > > It seems fine. Great. > As far as I can tell, the only significant difference between > this and WorkerCanvas is using an HTMLCanvasElement "bitmaprenderer" as a > zero-copy way to render an ImageBitmap, instead of HTMLImageElement. That's the main difference. Another is that OffscreenCanvas can be directly instantiated from both the main thread and workers. >Can you explain what the problem was with using HTMLImageElement? One browser implementer pointed out that HTMLImageElement has several complex internal states related to loading, and they do not want to conflate that with the display of ImageBitmaps. I've documented this in the OffscreenCanvas proposal. (I originally thought Canvas had more complex internal state, but now think that it can be easier to define new behavior against a new canvas context than <img>.) -Ken > Rob > -- > oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo > owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo > osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo > owohooo > osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o > oioso > oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo > owohooo > osoaoyoso,o o‘oYooouo ofooooolo!o’o owoiololo oboeo oiono odoaonogoeoro > ooofo > otohoeo ofoioroeo ooofo ohoeololo.
Received on Wednesday, 8 April 2015 21:44:33 UTC