On Wed, 12 Oct 2011 22:53:25 +0200, Stephen Mattison
<[email protected]> wrote:
Hey Zoltan thanks for the input! Is there anything I can do to make sure
that the decoding always happens in the WebThread? Ie not adding to the
DOM
or creating a dom fragment or something?
Currently, there is no WebThread in WebKit. If you are using WebKit2 then
there will be separated process for UI things and for Web things, what
increases UI's responsiveness, but with the current implementation
imagedecoding can block the loading a bit.
Zoltan
On Wed, Oct 12, 2011 at 3:01 AM, Zoltan Horvath <[email protected]>
wrote:
On Wed, 12 Oct 2011 03:39:19 +0200, Stephen Mattison <
[email protected]> wrote:
The problem I'm having is that it does not appear that PNGs are
decoded in
the background in Webkit on iOS. Right now what I have is essentially a
ScrollView. I have a div the size of the viewport with another div that
scales with the content. I am scrolling the content div using a
transition
and translate3d to achieve GPU acceleration. The scrolling looks great.
However the content is composed of images and they cannot all fit in
memory
at once so I am loading them on demand. The problem arises when I set
the
background-image css property to a locally stored PNG image and then
attempt
to scroll. I get a noticeable delay/jerkiness/hiccup as the image is
decoded. Is there something I should be doing differently?
Hey!
WebKit is decoding images in the mainthread when there is new chunk of
image and it hasn't decoded yet, thus it is imaginable that it blocks
your
main thread for 'longer' time.
I have a sketchy implementation for Qt to support imagedecoding in a
(currently 1) separate thread.
If you are interested check: https://bugs.webkit.org/show_**
bug.cgi?id=69515 <https://bugs.webkit.org/show_bug.cgi?id=69515>
Regards,
Zoltan
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