Re: Async Image - ImageData conversion

2015-07-07 Thread Anne van Kesteren
On Mon, Jul 6, 2015 at 2:38 PM, Ashley Gullen ash...@scirra.com wrote: I thought it would be more confusing to have separate competing proposals in one document? They are more like three revisions of the same document anyway, the latest one including all feedback and rationale so far:

Re: Async Image - ImageData conversion

2015-07-07 Thread Ashley Gullen
I'm new to writing specs and when I first looked ReSpec had templates and a guide - is there something similar for the HTML standard style spec? I changed toBlob to use a dictionary (still at https://www.scirra.com/labs/specs/imagedata-conversion-extensions.html). Ashley On 7 July 2015 at

Re: Async Image - ImageData conversion

2015-07-07 Thread Anne van Kesteren
On Tue, Jul 7, 2015 at 12:24 PM, Ashley Gullen ash...@scirra.com wrote: I'm new to writing specs and when I first looked ReSpec had templates and a guide - is there something similar for the HTML standard style spec? I think you can tweak ReSpec to do the right thing, though most new

Re: Async Image - ImageData conversion

2015-07-06 Thread Ashley Gullen
I thought it would be more confusing to have separate competing proposals in one document? They are more like three revisions of the same document anyway, the latest one including all feedback and rationale so far: https://www.scirra.com/labs/specs/imagedata-conversion-extensions.html On 3 July

Re: Async Image - ImageData conversion

2015-07-03 Thread Ashley Gullen
On 2 July 2015 at 21:36, Jeff Muizelaar jmuizel...@mozilla.com wrote: The important ones of these are: Blob - ImageData HTMLImageElement - ImageData ImageData - Blob These conversions are covered by what I proposed in my previous email, so I drafted another spec with them:

Re: Async Image - ImageData conversion

2015-07-03 Thread Anne van Kesteren
On Fri, Jul 3, 2015 at 1:51 PM, Ashley Gullen ash...@scirra.com wrote: These conversions are covered by what I proposed in my previous email, so I drafted another spec with them: https://www.scirra.com/labs/specs/imagedata-conversion-extensions.html Could you please put them all in a single

Re: Async Image - ImageData conversion

2015-07-02 Thread Jeff Muizelaar
I'm not sure having a hub is worth the implementation pain. It looks like there are three pretty different things here: ImageBitmap - Immutable images for drawing on canvas. Typically premultiplied data located on the GPU ImageData - Mutable script accessible array of data. Unpremultiplied data

Re: Async Image - ImageData conversion

2015-07-02 Thread Justin Novosad
Making ImageData the hub would imply more copies in memory in many cases. Because ImageData is mutable (not to mention the alpha multiplication issues which are also a factor), it cannot share its image buffer with the source it was created from, unlike ImageBitmap. Immutability is a significant

Re: Async Image - ImageData conversion

2015-06-30 Thread Ashley Gullen
If it's difficult to make ImageBitmap both an efficient drawing source and a conversion intermediary, then we could add conversion functions to each object that can be converted, e.g.: HTMLImageElement.toBlob() HTMLImageElement.toImageData() Blob.toImageData() ImageData.toBlob() This seems

Re: Async Image - ImageData conversion

2015-06-26 Thread Boris Zbarsky
On 6/26/15 4:07 AM, Ashley Gullen wrote: I don't think we should extend HTMLImageElement because it is not available in workers. Adding the conversion methods to ImageBitmap allows workers to perform conversions using Blob (compressed image data) in the place of HTMLImageElement. Maybe I

Re: Async Image - ImageData conversion

2015-06-26 Thread Ashley Gullen
Gosh, I keep putting the wrong terms in and it really confuses things. I need to get better at writing clearly! I mentioned transferToImageBitmap when I meant transferToImageData. The parargraph from my second-last email should read: I like the suggestion that ImageBitmap be the hub of image

Re: Async Image - ImageData conversion

2015-06-26 Thread Ashley Gullen
I'm also wondering that if we have ImageBitmap.transferToImageData(), should we not also have ImageData.transferToImageBitmap()? Currently createImageBitmap(imageData) appears to require making a copy. On 26 June 2015 at 12:07, Ashley Gullen ash...@scirra.com wrote: I've updated the draft with

Re: Async Image - ImageData conversion

2015-06-26 Thread Justin Novosad
On Thu, Jun 25, 2015 at 4:57 PM, Boris Zbarsky bzbar...@mit.edu wrote: On 6/24/15 1:28 PM, Ashley Gullen wrote: Note for devices with discrete GPUs, it's possible that ImageBitmap stores the decompressed image data in a GPU texture but does not have it in system RAM. Indeed. This is

Re: Async Image - ImageData conversion

2015-06-26 Thread Ashley Gullen
I've updated the draft with an ImageBitmap.transferToImageData() method: https://www.scirra.com/labs/specs/imagebitmap-conversion-extensions.html It's also used in Example 2 to demonstrate converting a Blob to an ImageData without redundantly copying the pixel data. I don't think we should extend

Re: Async Image - ImageData conversion

2015-06-26 Thread Justin Novosad
On Fri, Jun 26, 2015 at 7:07 AM, Ashley Gullen ash...@scirra.com wrote: I've updated the draft with an ImageBitmap.transferToImageData() method: https://www.scirra.com/labs/specs/imagebitmap-conversion-extensions.html It's also used in Example 2 to demonstrate converting a Blob to an

Re: Async Image - ImageData conversion

2015-06-25 Thread Justin Novosad
On Thu, Jun 25, 2015 at 9:40 AM, Justin Novosad ju...@google.com wrote: On Thu, Jun 25, 2015 at 5:56 AM, Ashley Gullen ash...@scirra.com wrote: I see that OffscreenCanvas also specifies a close() method for ImageBitmap. Perhaps browsers could use copy-on-write with the toImageData()

Re: Async Image - ImageData conversion

2015-06-25 Thread Justin Novosad
On Thu, Jun 25, 2015 at 5:56 AM, Ashley Gullen ash...@scirra.com wrote: I see that OffscreenCanvas also specifies a close() method for ImageBitmap. Perhaps browsers could use copy-on-write with the toImageData() method? Then you can efficiently either transfer or copy depending on if you

Re: Async Image - ImageData conversion

2015-06-25 Thread Ashley Gullen
I see that OffscreenCanvas also specifies a close() method for ImageBitmap. Perhaps browsers could use copy-on-write with the toImageData() method? Then you can efficiently either transfer or copy depending on if you close the ImageBitmap you transferred to an ImageData. Transfer:

Re: Async Image - ImageData conversion

2015-06-25 Thread Boris Zbarsky
On 6/24/15 1:28 PM, Ashley Gullen wrote: I'm new to specs and WebIDL, my intent was to say those are new methods on ImageBitmap. Is partial interface ImageBitmap the correct way to say that? Yes, it is. The wording of undue latency in the ImageBitmap spec does not appear to rule out

Re: Async Image - ImageData conversion

2015-06-25 Thread Anne van Kesteren
On Thu, Jun 25, 2015 at 1:57 PM, Boris Zbarsky bzbar...@mit.edu wrote: The drawback of adding toBlob/toImageData to the various things ImageData can be constructed from is that it's a bit more spec complexity, but I don't see that as a showstopper, necessarily. We should probably stick to the

Re: Subject=Re: Async Image - ImageData conversion

2015-06-24 Thread Ashley Gullen
Good point - it makes sense to have ImageBitmap as the hub of all conversion. I've drafted a new spec which instead proposes ImageBitmap.toBlob() and ImageBitmap.toImageData(): https://www.scirra.com/labs/specs/imagebitmap-conversion-extensions.html This should cover all conversion cases

Re: Async Image - ImageData conversion

2015-06-24 Thread Ashley Gullen
Sorry for the confusion. Yes, the latest URL is: https://www.scirra.com/labs/specs/imagebitmap-conversion-extensions.html I'm new to specs and WebIDL, my intent was to say those are new methods on ImageBitmap. Is partial interface ImageBitmap the correct way to say that? (I updated the URL to say

Re: Async Image - ImageData conversion

2015-06-24 Thread Kenneth Russell
On Wed, Jun 24, 2015 at 1:28 PM, Ashley Gullen ash...@scirra.com wrote: Sorry for the confusion. Yes, the latest URL is: https://www.scirra.com/labs/specs/imagebitmap-conversion-extensions.html I'm new to specs and WebIDL, my intent was to say those are new methods on ImageBitmap. Is partial

Re: Async Image - ImageData conversion

2015-06-24 Thread Boris Zbarsky
On 6/19/15 5:43 AM, Ashley Gullen wrote: I've not done this before, so I've no idea if this is the right/useful approach, but I drafted a spec for it here: https://www.scirra.com/labs/specs/imagedata-blob-extensions.html Ashley, We at Mozilla were just discussing this proposal, and we have a

Re: Async Image - ImageData conversion

2015-06-24 Thread Boris Zbarsky
On 6/19/15 5:43 AM, Ashley Gullen wrote: I've not done this before, so I've no idea if this is the right/useful approach, but I drafted a spec for it here: https://www.scirra.com/labs/specs/imagedata-blob-extensions.html Let me know if you have any feedback on this. Ashley, I assume the

Subject=Re: Async Image - ImageData conversion

2015-06-23 Thread Justin Novosad
Based on feedback received from web developers, new APIs that move image data around should also strive to eliminate intermediate copies of the image data to avoid memory bloat. I think your proposal achieves that, but I think memory footprint reduction could be a stated objective of the proposal.

Re: Async Image - ImageData conversion

2015-06-19 Thread Ashley Gullen
. *From:* a...@scirra.com [mailto:a...@scirra.com] *On Behalf Of *Ashley Gullen *Sent:* Wednesday, June 17, 2015 2:06 PM *To:* Travis Leithead *Cc:* public-webapps@w3.org *Subject:* Re: Async Image - ImageData conversion That seems like a good start. I suppose there should

Re: Async Image - ImageData conversion

2015-06-19 Thread Ashley Gullen
[mailto:a...@scirra.com] *On Behalf Of *Ashley Gullen *Sent:* Wednesday, June 17, 2015 2:06 PM *To:* Travis Leithead *Cc:* public-webapps@w3.org *Subject:* Re: Async Image - ImageData conversion That seems like a good start. I suppose there should be a putImageDataAsync counterpart too

RE: Async Image - ImageData conversion

2015-06-18 Thread Travis Leithead
...@scirra.com] On Behalf Of Ashley Gullen Sent: Wednesday, June 17, 2015 2:06 PM To: Travis Leithead Cc: public-webapps@w3.org Subject: Re: Async Image - ImageData conversion That seems like a good start. I suppose there should be a putImageDataAsync counterpart too? Then we can do: Blob - Image via: load

RE: Async Image - ImageData conversion

2015-06-17 Thread Travis Leithead
10:00 AM To: public-webapps@w3.org Subject: Async Image - ImageData conversion I was wondering if there is anything on the standards track to asynchronously get an ImageData object from an Image? We have a web app dealing with large sprite sheets (up to 2048x2048), and at some point we need

Re: Async Image - ImageData conversion

2015-06-17 Thread Ashley Gullen
Gullen *Sent:* Wednesday, June 17, 2015 10:00 AM *To:* public-webapps@w3.org *Subject:* Async Image - ImageData conversion I was wondering if there is anything on the standards track to asynchronously get an ImageData object from an Image? We have a web app dealing with large sprite

Async Image - ImageData conversion

2015-06-17 Thread Ashley Gullen
I was wondering if there is anything on the standards track to asynchronously get an ImageData object from an Image? We have a web app dealing with large sprite sheets (up to 2048x2048), and at some point we need to get an ImageData for this. Currently the only way I know of doing this is via a