- From: Kevin Gadd <kevin.gadd@gmail.com>
- Date: Tue, 18 Dec 2012 07:17:29 -0800
- To: Justin Novosad <junov@chromium.org>
- 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
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. 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). Is it async because it supports using Video and Blob as the source? I really love the feature set (being able to pass ImageData in is going to be a huge boon - no more temporary canvases just to create images from pixel data!) but if it's async-only I don't know how useful it will be for the issues that led me to starting this discussion thread in the first place. -kg 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 15:18:32 UTC