Hi,
On 07/16/2011 01:24 PM, ext haithem rahmani wrote:
When Running QtWebKit on top of directfb (qt-embedded 4.7.2) I noticed
that the image decoding is very very slow
compared to WebKitGtk.
Some images are displayed in 3 secs compared to 0.3 secs.
http://nontroppo.org/timer for example took 2200ms on webKitGtk
however it needs more than 6000ms for the full load.
(the scores are collected on a ST SoC.)
I've found the following entry in the bugs.webkit.org
<http://bugs.webkit.org> https://bugs.webkit.org/show_bug.cgi?id=27538
<https://bugs.webkit.org/show_bug.cgi?id=27538>but the work done by
Holger was not totally applied in QtWebKit
especially the patch to use the webcore image decoders . is there any
reason for that?
the patches are a bit old compared to the current code. Does any body
have an updated one applicable on the QtWebKit-2.2?
I doubt decoding is the issue. Except for the GIF format, the decoding
of images is done by the usual libraries (libjpeg, libpng).
My guess is color conversion could be an issue depending on the target
color format on your directfb. If the color format on 32 bits, the
problem could also be on composition or the final color conversion to
the target framebuffer.
(If the problem is on color conversion, scrolling is likely to be slower
than usual as well).
I suggest you to profile your application (oprofile generally works
great on Linux devices) and share the results here.
cheers,
Benjamin
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