Hi Alex,
I've created a 150x80 version of my images but performances are almost
the same (at least on Android)
Gabri
Il 30/06/14 17:19, Alex Harui ha scritto:
Hi Gabriele,
You say your renderer is 150x80, yet the source images are 400x400 and up to
100KB.
Image loading is asynchronous, but bitmap rendering is not. If a 400x400 image
has to be shrunk to 150x80, that will take a lot of CPU power. It would be
better to have the images re-sampled before downloading. There will be less
data and the bitmap renderer will not have to shrink images. As a test, chop a
bunch of images to the right size and see if it performs better.
-Alex
________________________________________
From: Gabriele Campi [[email protected]]
Sent: Monday, June 30, 2014 8:11 AM
To: [email protected]
Subject: Re: list of images: poor performances
My custom ItemRenderer is 150x80
I display 18 items at the same time
Using an IconItemRenderer doesn't help
*GABRIELE CAMPI*
Graphical Department
Il 30/06/14 17:09, Gabriele Campi ha scritto:
150 images
Size 10 to 100 KB
400x400 pixel
On iPad retina is almost ok. On iPad2/Mini is slow. On Android (galaxy
tab 2) the list is unusable.
Every new row of the list seems to freeze the ui while images are loading.
I don't understand, Isn't the load process of the images asynchronous?
Gabri
Il 30/06/14 16:49, Alex Harui ha scritto:
How many images are we talking about? What pixel dimensions are the images in
the list? What are some of the sizes in bytes of the images being downloaded?
-Alex
________________________________________
From: Gabriele Campi [[email protected]]
Sent: Monday, June 30, 2014 6:30 AM
To: Javier Guerrero García; users
Subject: Re: list of images: poor performances
Nothing seems to work... performances are even worse with a timer or delay
I cannot cache all the images because of memory consumption
Il 28/06/14 10:44, Javier Guerrero García ha scritto:
Also adjust the opaqueBackground, don't set the image sources
inmediately but after a short timeout (so if you scroll down fast
skipping lets say 50 images you DON'T load 50 images before loading
the 51st), and use a contentCache loader with queueing
(http://corlan.org/2011/08/16/flex-mobile-development-caching-images-using-contentcache/)
P.S. you can use the ContentCache straight from MXML, not like the
sources in the link. Just declare it, set an ID and the rest of the
parameters, and set contentCache="{id}" in your itemRenderer.
On Sat, Jun 28, 2014 at 6:58 AM, Alex Harui <[email protected]
<mailto:[email protected]>> wrote:
Make sure you are using a bitmap cache and that the images are not
being scaled down on the device.
Sent via the PANTECH Discover, an AT&T 4G LTE smartphone.
Gabriele Campi <[email protected]
<mailto:[email protected]>> wrote:
Hi,
in a mobile app I need to display a list of 200 images. On the list I
use a tileLayout with virtualLayout=true and a custom itemRenderer
that
only contains a Spark Image. On the set value method of the
itemrenderer
I change the source of the image with the path to the new bitmap.
It works, but performances are poor and the list doesn't scroll
well. On
iPad it's almost acceptable, but on Android I have to scroll row
by row
and wait until every image of the row is loaded.
Any suggestions to improve the situation?
Thanks
Gabriele
