On Mon, Mar 15, 2010 at 3:05 AM, Maciej Stachowiak m...@apple.com wrote:
=== Summary of Data ===
1) In all browsers tested, copying to an ImageData and then back to a canvas
(two blits) is faster than a 2x scale.
2) In all browsers tested, twice the cost of a canvas-to-canvas blit is
On Mar 14, 2010, at 6:22 PM, Jonas Sicking wrote:
One way to do it would be to have an function somewhere, not
necessarily on the 2D context, which given a Blob, returns an
ImageData object. However this still results in the image being loaded
twice into memory, so would only really help if
I agree that the number of steps is not important for responsiveness
or performance (though it is for complexity). However several of those
steps seemed to involved non-trivial amount of CPU usage, that was the
concern expressed in my initial mail.
At the very least I think we have a skewed
On Mar 15, 2010, at 12:28 AM, Jonas Sicking wrote:
=== Conclusions ===
1) For scaling an image up 2x, copying to an ImageData and back for
processing on a Worker would improve responsiveness, relative to
just doing
the scale on the main thread.
2) Copying from one canvas to another is
On Mon, Mar 15, 2010 at 7:05 AM, Maciej Stachowiak m...@apple.com wrote:
Copying from one canvas to another is much faster than copying to/from
ImageData. To make copying to a Worker worthwhile as a responsiveness
improvement for rotations or downscales, in addition to the OffscreenCanvas
On Mar 15, 2010, at 3:46 AM, Philip Taylor wrote:
On Mon, Mar 15, 2010 at 7:05 AM, Maciej Stachowiak m...@apple.com
wrote:
Copying from one canvas to another is much faster than copying to/
from
ImageData. To make copying to a Worker worthwhile as a responsiveness
improvement for rotations
On 3/15/2010 4:22 AM, Maciej Stachowiak wrote:
On Mar 15, 2010, at 3:46 AM, Philip Taylor wrote:
On Mon, Mar 15, 2010 at 7:05 AM, Maciej Stachowiak m...@apple.com
wrote:
Copying from one canvas to another is much faster than copying to/from
ImageData. To make copying to a Worker worthwhile
On Mar 15, 2010, at 2:24 PM, Vladimir Vukicevic wrote:
If we wanted to support this across workers (and I think it would be helpful
to figure out how to do so), something like saying that if a canvas object
was passed (somehow) between workers, it would be a copy -- and internally it
could
On Mar 13, 2010, at 12:30 PM, Jonas Sicking wrote:
On Sat, Mar 13, 2010 at 12:09 PM, Oliver Hunt oli...@apple.com
wrote:
On Mar 13, 2010, at 9:10 AM, Jonas Sicking wrote:
There is a use case, which I suspect is quite common, for using
canvas to manipulate files on the users file system.
On Sun, Mar 14, 2010 at 1:43 AM, Maciej Stachowiak m...@apple.com wrote:
On Mar 13, 2010, at 12:30 PM, Jonas Sicking wrote:
On Sat, Mar 13, 2010 at 12:09 PM, Oliver Hunt oli...@apple.com wrote:
On Mar 13, 2010, at 9:10 AM, Jonas Sicking wrote:
There is a use case, which I suspect is quite
On Fri, Mar 12, 2010 at 10:07 PM, Maciej Stachowiak m...@apple.com wrote:
On Mar 12, 2010, at 6:20 PM, Jonas Sicking wrote:
Oh, another thing to keep in mind is that if/when we add fromBlob to
the main-thread canvas, it has to be asynchronous in order to avoid
main thread synchronous IO.
On Mar 13, 2010, at 9:10 AM, Jonas Sicking wrote:
There is a use case, which I suspect is quite common, for using
canvas to manipulate files on the users file system. For example
when creating a photo uploader which does client side scaling before
uploading the images, or for creating a web
On Sat, Mar 13, 2010 at 12:09 PM, Oliver Hunt oli...@apple.com wrote:
On Mar 13, 2010, at 9:10 AM, Jonas Sicking wrote:
There is a use case, which I suspect is quite common, for using
canvas to manipulate files on the users file system. For example
when creating a photo uploader which does
On Mon, Feb 22, 2010 at 11:57 AM, Drew Wilson atwil...@google.com wrote:
Do we feel that text APIs are, in general, difficult to implement in a
multi-thread safe manner?
On Mon, Feb 22, 2010 at 11:51 AM, Michael Nordman micha...@google.com
wrote:
The lack of support for text drawing in the
On Fri, Mar 12, 2010 at 11:57 AM, David Levin le...@google.com wrote:
On Mon, Feb 22, 2010 at 3:10 PM, Jonas Sicking jo...@sicking.cc wrote:
What is the use case for this? It seems like in most cases you'll want
to display something on screen to the user, and so the difference
comes down to
On Fri, Mar 12, 2010 at 12:16 PM, Jonas Sicking jo...@sicking.cc wrote:
On Fri, Mar 12, 2010 at 11:57 AM, David Levin le...@google.com wrote:
On Mon, Feb 22, 2010 at 3:10 PM, Jonas Sicking jo...@sicking.cc wrote:
What is the use case for this? It seems like in most cases you'll want
to
On Mar 12, 2010, at 12:16 PM, Jonas Sicking wrote:
I'm not saying that the proposed API is bad. It just doesn't seem to
solve the (seemingly most commonly requested) use case of
rotating/scaling images. So if we want to solve those use cases we
need to either come up with a separate API for
On Fri, Mar 12, 2010 at 12:46 PM, Oliver Hunt oli...@apple.com wrote:
On Mar 12, 2010, at 12:16 PM, Jonas Sicking wrote:
I'm not saying that the proposed API is bad. It just doesn't seem to
solve the (seemingly most commonly requested) use case of
rotating/scaling images. So if we want to
On Fri, Mar 12, 2010 at 2:35 PM, Jonas Sicking jo...@sicking.cc wrote:
On Fri, Mar 12, 2010 at 12:46 PM, Oliver Hunt oli...@apple.com wrote:
On Mar 12, 2010, at 12:16 PM, Jonas Sicking wrote:
I'm not saying that the proposed API is bad. It just doesn't seem to
solve the (seemingly most
On Fri, Mar 12, 2010 at 3:38 PM, David Levin le...@google.com wrote:
On Fri, Mar 12, 2010 at 2:35 PM, Jonas Sicking jo...@sicking.cc wrote:
On Fri, Mar 12, 2010 at 12:46 PM, Oliver Hunt oli...@apple.com wrote:
On Mar 12, 2010, at 12:16 PM, Jonas Sicking wrote:
I'm not saying that the
On Mar 12, 2010, at 2:35 PM, Jonas Sicking wrote:
On Fri, Mar 12, 2010 at 12:46 PM, Oliver Hunt oli...@apple.com
wrote:
On Mar 12, 2010, at 12:16 PM, Jonas Sicking wrote:
I'm not saying that the proposed API is bad. It just doesn't seem to
solve the (seemingly most commonly requested) use
On Fri, Mar 12, 2010 at 4:19 PM, Jonas Sicking jo...@sicking.cc wrote:
On Fri, Mar 12, 2010 at 3:38 PM, David Levin le...@google.com wrote:
On Fri, Mar 12, 2010 at 2:35 PM, Jonas Sicking jo...@sicking.cc wrote:
On Fri, Mar 12, 2010 at 12:46 PM, Oliver Hunt oli...@apple.com wrote:
On Mar
On Mar 12, 2010, at 6:20 PM, Jonas Sicking wrote:
On Fri, Mar 12, 2010 at 4:19 PM, Jonas Sicking jo...@sicking.cc
wrote:
On Fri, Mar 12, 2010 at 3:38 PM, David Levin le...@google.com
wrote:
On Fri, Mar 12, 2010 at 2:35 PM, Jonas Sicking jo...@sicking.cc
wrote:
On Fri, Mar 12, 2010 at
On Feb 23, 2010, at 10:04 PM, Jonas Sicking wrote:
On Tue, Feb 23, 2010 at 9:57 PM, Maciej Stachowiak m...@apple.com
wrote:
- Raytracing a complex scene at high resolution.
- Drawing a highly zoomed in high resolution portion of the
Mandelbrot set.
To be fair though, you could compute
On Feb 24, 2010, at 12:09 AM, Maciej Stachowiak wrote:
On Feb 23, 2010, at 10:04 PM, Jonas Sicking wrote:
On Tue, Feb 23, 2010 at 9:57 PM, Maciej Stachowiak m...@apple.com
wrote:
- Raytracing a complex scene at high resolution.
- Drawing a highly zoomed in high resolution portion of the
On Wed, Feb 24, 2010 at 12:14 AM, Maciej Stachowiak m...@apple.com wrote:
On Feb 24, 2010, at 12:09 AM, Maciej Stachowiak wrote:
On Feb 23, 2010, at 10:04 PM, Jonas Sicking wrote:
On Tue, Feb 23, 2010 at 9:57 PM, Maciej Stachowiak m...@apple.com wrote:
- Raytracing a complex scene at high
On Wed, Feb 24, 2010 at 1:35 AM, Jonas Sicking jo...@sicking.cc wrote:
On Wed, Feb 24, 2010 at 12:14 AM, Maciej Stachowiak m...@apple.com wrote:
On Feb 24, 2010, at 12:09 AM, Maciej Stachowiak wrote:
On Feb 23, 2010, at 10:04 PM, Jonas Sicking wrote:
On Tue, Feb 23, 2010 at 9:57 PM, Maciej
On Feb 24, 2010, at 1:35 AM, Jonas Sicking wrote:
On Wed, Feb 24, 2010 at 12:14 AM, Maciej Stachowiak m...@apple.com
wrote:
On Feb 24, 2010, at 12:09 AM, Maciej Stachowiak wrote:
On Feb 23, 2010, at 10:04 PM, Jonas Sicking wrote:
On Tue, Feb 23, 2010 at 9:57 PM, Maciej Stachowiak
Regarding the three steps of offscreen rendering:
1. Draw stuff
2. Ship pixels to main thread
3. Draw them on the screen.
How would you do #2 efficiently? If you used toDataUr*l*(), then you have to
encode a png on one side and then decode the png on the main thread. I think
we might want to add
On Wed, 24 Feb 2010 16:45:44 +0100, Andrew Grieve agri...@google.com
wrote:
How would you do #2 efficiently? If you used toDataUr*l*(), then you
have to
encode a png on one side and then decode the png on the main thread. I
think
we might want to add some sort of API for blitting directly
On Tue, Feb 23, 2010 at 12:46 AM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 4:34 PM, Jeremy Orlow jor...@chromium.org wrote:
On Tue, Feb 23, 2010 at 12:05 AM, Jonas Sicking jo...@sicking.cc
wrote:
On Mon, Feb 22, 2010 at 3:43 PM, Jeremy Orlow jor...@chromium.org
On Mon, Feb 22, 2010 at 4:05 PM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 3:43 PM, Jeremy Orlow jor...@chromium.org wrote:
On Mon, Feb 22, 2010 at 11:10 PM, Jonas Sicking jo...@sicking.cc
wrote:
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
On Tue, Feb 23, 2010 at 11:31 AM, Jeremy Orlow jor...@chromium.org wrote:
On Tue, Feb 23, 2010 at 12:46 AM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 4:34 PM, Jeremy Orlow jor...@chromium.org
wrote:
On Tue, Feb 23, 2010 at 12:05 AM, Jonas Sicking jo...@sicking.cc
wrote:
On Feb 23, 2010, at 7:40 AM, Jeremy Orlow wrote:
Note that doing rendering in a worker and then displaying it on the
the main thread also gives you double buffering for no additional
cost. This is something our teams are excited about as well.
While I think the use cases presented for
On Tue, Feb 23, 2010 at 9:57 PM, Maciej Stachowiak m...@apple.com wrote:
- Raytracing a complex scene at high resolution.
- Drawing a highly zoomed in high resolution portion of the Mandelbrot set.
To be fair though, you could compute the pixels for those with just math,
there is no need to
On Tue, Feb 23, 2010 at 10:04 PM, Jonas Sicking jo...@sicking.cc wrote:
On Tue, Feb 23, 2010 at 9:57 PM, Maciej Stachowiak m...@apple.com wrote:
- Raytracing a complex scene at high resolution.
- Drawing a highly zoomed in high resolution portion of the Mandelbrot set.
To be fair though, you
I've talked with some other folks on WebKit (Maciej and Oliver) about having
a canvas that is available to workers. They suggested some nice
modifications to make it an offscreen canvas, which may be used in the
Document or in a Worker.
Proposal:
Introduce an OffscreenCanvas which may be created
The lack of support for text drawing in the worker context seems like a
short sighted mistake. I understand there may be implementation issues in
some browsers, but lack of text support feels like a glaring omission spec
wise.
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
I've talked with some other folks on WebKit (Maciej and Oliver) about
having a canvas that is available to workers. They suggested some nice
modifications to make it an offscreen canvas, which may be used in the
Document or
On Feb 22, 2010, at 11:13 AM, David Levin wrote:
I've talked with some other folks on WebKit (Maciej and Oliver)
about having a canvas that is available to workers. They suggested
some nice modifications to make it an offscreen canvas, which may be
used in the Document or in a Worker.
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
I've talked with some other folks on WebKit (Maciej and Oliver) about having
a canvas that is available to workers. They suggested some nice
modifications to make it an offscreen canvas, which may be used in the
Document or
On Mon, Feb 22, 2010 at 11:10 PM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
I've talked with some other folks on WebKit (Maciej and Oliver) about
having
a canvas that is available to workers. They suggested some nice
On Mon, Feb 22, 2010 at 3:36 PM, David Levin le...@google.com wrote:
On Mon, Feb 22, 2010 at 3:10 PM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
I've talked with some other folks on WebKit (Maciej and Oliver) about
having
On Mon, Feb 22, 2010 at 3:43 PM, Jeremy Orlow jor...@chromium.org wrote:
On Mon, Feb 22, 2010 at 11:10 PM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
I've talked with some other folks on WebKit (Maciej and Oliver) about
having
On Tue, Feb 23, 2010 at 12:05 AM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 3:43 PM, Jeremy Orlow jor...@chromium.org wrote:
On Mon, Feb 22, 2010 at 11:10 PM, Jonas Sicking jo...@sicking.cc
wrote:
On Mon, Feb 22, 2010 at 11:13 AM, David Levin le...@google.com wrote:
On Mon, Feb 22, 2010 at 4:34 PM, Jeremy Orlow jor...@chromium.org wrote:
On Tue, Feb 23, 2010 at 12:05 AM, Jonas Sicking jo...@sicking.cc wrote:
On Mon, Feb 22, 2010 at 3:43 PM, Jeremy Orlow jor...@chromium.org wrote:
On Mon, Feb 22, 2010 at 11:10 PM, Jonas Sicking jo...@sicking.cc
wrote:
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