- From: Justin Novosad <junov@chromium.org>
- Date: Tue, 18 Dec 2012 10:39:27 -0500
- To: Kevin Gadd <kevin.gadd@gmail.com>
- Cc: Vladimir Vukicevic <vladimir@pobox.com>, Rik Cabanier <cabanier@gmail.com>, whatwg@lists.whatwg.org, Jeff Muizelaar <jmuizelaar@mozilla.com>, Ian Hickson <ian@hixie.ch>, robert@ocallahan.org
On Tue, Dec 18, 2012 at 10:17 AM, Kevin Gadd <kevin.gadd@gmail.com> wrote: > Sorry, upon reading over the ImageBitmap part of the spec again I'm > confused: Why is constructing an ImageBitmap asynchronous? I thought > any decoding isn't supposed to happen until drawImage, so I don't > really understand why this operation involves a callback and a delay. > The image may have to be downloaded, which is a good reason for being async. > Making ImageBitmap creation async means that you *cannot* use this as > a replacement for drawImage source rectangles unless you know all > possible source rectangles in advance. This is not possible for many, > many use cases (scrolling through a bitmap would be one trivial > example). > I am not sure I understand the problem. If you need synchronous behavior, you can just make the app wait for the callback to be called. -Justin > On Tue, Dec 18, 2012 at 7:12 AM, Kevin Gadd <kevin.gadd@gmail.com> wrote: > > Is it possible to expose the width/height of an ImageBitmap, or even > > expose all the rectangle coordinates? Exposing width/height would be > > nice for parity with Image and Canvas when writing functions that > > accept any drawable image source. > > > > Thanks for the prompt action here, this looks like a straightforward > solution. > > > > -kg > > > > On Tue, Dec 18, 2012 at 7:03 AM, Justin Novosad <junov@chromium.org> > wrote: > >> Thanks Ian. > >> http://html5.org/tools/web-apps-tracker?from=7588&to=7589 > >> > >> On Tue, Dec 18, 2012 at 1:04 AM, Robert O'Callahan < > robert@ocallahan.org> > >> wrote: > >>> > >>> On Tue, Dec 18, 2012 at 6:57 PM, Rik Cabanier <cabanier@gmail.com> > wrote: > >>>> > >>>> Does it matter that this solution is in the image world and not 2d > >>>> canvas? It seems that this will have a bigger impact on the browser's > >>>> codebase since it spans images and canvas. > >>> > >>> > >>> I think that's a good thing --- it's more generally useful. > >>> > >>> Note that Ian has adopted this approach (via an ImageBitmap > constructor). > >>> > >>> > >>> Rob > >>> -- > >>> Jesus called them together and said, “You know that the rulers of the > >>> Gentiles lord it over them, and their high officials exercise > authority over > >>> them. Not so with you. Instead, whoever wants to become great among > you must > >>> be your servant, and whoever wants to be first must be your slave — > just as > >>> the Son of Man did not come to be served, but to serve, and to give > his life > >>> as a ransom for many.” [Matthew 20:25-28] > >>> > >> > > > > > > > > -- > > -kg > > > > -- > -kg >
Received on Tuesday, 18 December 2012 15:39:54 UTC