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[Bug 19071] New: Add ArrayBuffer to Transferable types list (2.8.4); update Structured clone algorithm

From: <bugzilla@jessica.w3.org>
Date: Tue, 25 Sep 2012 22:24:46 +0000
To: public-html@w3.org
Message-ID: <bug-19071-2495@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=19071

           Summary: Add ArrayBuffer to Transferable types list (2.8.4);
                    update Structured clone algorithm
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec
        AssignedTo: dave.null@w3.org
        ReportedBy: contributor@whatwg.org
         QAContact: public-html-bugzilla@w3.org
                CC: ian@hixie.ch, mike@w3.org,
                    public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org, kbr@google.com


This was was cloned from bug 13800 as part of operation REMIND convergence.
Originally filed: 2011-08-17 00:12:00 +0000
Original reporter: Travis Leithead [MSFT] <travil@microsoft.com>

================================================================================
 #0   Travis Leithead [MSFT]                          2011-08-17 00:12:02 +0000 
--------------------------------------------------------------------------------
In order to support suggested changes in CanvasPixelArray -> Uint8ClampedArray
(per bug 12586), ArrayBuffer should be specified as a Transferable type in
section 2.8.4.

Furthermore, in the structured clone algorithm, the cloning of ImageData should
be updated to allow the ImageData's Uint8ClampedArray to be transferred:

Current text:
&#8618;If input is a ImageData object
Let output be a newly constructed ImageData object with the same width and
height as input, and with a newly constructed CanvasPixelArray for its data
attribute, with the same length and pixel values as the input's.

Proposed change:
&#8618;If input is a ImageData object
Let output be a newly constructed ImageData object with the same width and
height as input, and with a newly constructed Uint8ClampedArray view of the
ArrayBuffer in the destination object of memory for its data attribute, with
the same length and pixel values as the input's.

...or similar text to indicate that if the ImageData's Uint8ClampedArray's
ArrayBuffer is transfered, then the new Uint8ClampedArray instance will be
created over the transferred ArrayBuffer.
================================================================================
 #1   Ian 'Hixie' Hickson                             2011-09-21 22:55:52 +0000 
--------------------------------------------------------------------------------
This is being specced in the TypedArray spec for the moment, but it'll come
over once it's solid. (kbr: Correct me if I'm wrong here.)
================================================================================
 #2   Ian 'Hixie' Hickson                             2011-10-19 23:58:35 +0000 
--------------------------------------------------------------------------------
Marking this REMIND for now. I will be doing this but we're waiting for the
ArrayBuffer part of this to be stable before moving it from ArrayBuffer to
HTML.

Please don't hesitate to reopen this if you notice that ArrayBuffer is ready
for this before I do.
================================================================================
 #3   Kenneth Russell                                 2011-10-20 01:45:49 +0000 
--------------------------------------------------------------------------------
I'd like to request review of the changes that were made to the typed array
spec today in response to http://www.w3.org/Bugs/Public/show_bug.cgi?id=13799 .
Please see https://www.khronos.org/registry/typedarray/specs/latest/ . If they
look okay, that's a good indication that they're solidifying.
================================================================================
 #4   Ian 'Hixie' Hickson                             2011-10-20 05:53:43 +0000 
--------------------------------------------------------------------------------
Roger, will do.
================================================================================
 #5   Ian 'Hixie' Hickson                             2011-10-20 06:19:34 +0000 
--------------------------------------------------------------------------------
kbr: The new text looks good.
================================================================================
 #6   Ian 'Hixie' Hickson                             2011-10-25 04:17:52 +0000 
--------------------------------------------------------------------------------
kbr: Do you want me to move this to the HTML spec? Or should I wait? (Either is
fine by me.)
================================================================================
 #7   Kenneth Russell                                 2011-10-25 04:59:37 +0000 
--------------------------------------------------------------------------------
Thanks for your review above.

(In reply to comment #6)
> kbr: Do you want me to move this to the HTML spec? Or should I wait? (Either is
> fine by me.)

Could we hold off a little longer? Ideally I'd like to snapshot the typed array
spec again, so that the new functionality isn't highlighted as strawman
proposals.

If this means closing this bug as REMIND again, no problem; I can take
responsibility for reopening it when the next snapshot is taken.
================================================================================
 #8   Ian 'Hixie' Hickson                             2011-10-25 05:12:12 +0000 
--------------------------------------------------------------------------------
Cool, thanks. Will mark it REMIND, just reopen it when you're ready!
================================================================================

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Received on Tuesday, 25 September 2012 22:24:47 UTC

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