If you want to turn on bitmap caching via actionscript, you can see an
example in the drawview source:
http://svn.openlaszlo.org/openlaszlo/trunk/lps/components/extensions/drawview.lzx
e.g.:
var context = this.getMCRef();
context.cacheAsBitmap = true/false
This will work with any view, provided you're running flash 8 or greater.
If you find yourself doing this a lot, please file a bug and we can add
a more formal API to view for you. Note that the more actionscript you
add using this technique, the less your app will work in other runtimes...
All drawviews have cacheBitmap on by default. If you want to
experiment, you can try setting the drawview's cachebitmap attribute to
false.
Gilad Parann-Nissany wrote:
Thank you for the input. Could you give us concrete code examples of:
1. calling ActionScript directly in our OL code
2. using drawview (or any other technique) to create a bitmap cache of
our SWFs. Note: we can limit ourselves to "simple views' (views that do
not nest other views) as a first step if necessary.
Gilad
Gilad Parann-Nissany
----- Original Message -----
From: "Max Carlson" <[EMAIL PROTECTED]>
To: "P T Withington" <[EMAIL PROTECTED]>
Cc: "Gilad Parann-Nissany" <[EMAIL PROTECTED]>, "Max Carlson"
<[EMAIL PROTECTED]>, "laszlo-user" <[email protected]>,
"Ammar Tamazi" <[EMAIL PROTECTED]>, "Elias Khalil"
<[EMAIL PROTECTED]>, "Lou Iorio" <[EMAIL PROTECTED]>
Sent: Thursday, April 17, 2008 7:18:24 PM (GMT+0200) Auto-Detected
Subject: Re: Understanding Flash memory usage when using Laszlo
P T Withington wrote:
> On 2008-04-17, at 09:12 EDT, Gilad Parann-Nissany wrote:
>> Hi
>>
>> With the help from this forum we have been making progress
>> understanding our memory usage. See the separate thread: [Laszlo-user]
>> Understanding memory analysis when using _LzDebug.whyAlive()
>>
>> We're now at the point were we see that the "smoots" taken up by
>> Laszlo objects are not all of our memory usage. It seems a large part
>> (large percentage of total RAM usage, maybe even more than 50%) may be
>> used elsewhere, perhaps in the Flash objects that are "underneath" the
>> Laszlo objects.
>>
>> Questions:
>>
>> 1. Is there any tool or technique that allows us to analyze exactly
>> how this memory is being used by Flash? ("underneath" the laszlo
>> objects, I mean)
>
> I am not aware of such a tool. There may be a tool provided by Adobe.
Actually, this will be a nice benefit from the move to swf9. Flex
builder (and presumably fdb) have profiling tools that can show this
kind of memory usage.
>> 2. Are there any guidelines to help us optimize this Flash part of
>> our memory usage?
>> 3. More generally is there any way to use Flash-specific
>> optimization techniques (going to the ActionScript where necessary).
>> We know that in pure Flash there are several optimization techniques;
>> the following points are examples of things we wish to try
>> 4. Can we in general call pieces of ActionScript from Laszlo script?
>
> Yes. The OL compiler does not prevent you from doing that, but neither
> is it supported.
>
>> 5. Bitmap caching:
>>
>>
>> • SWF resources can be translated once into bitmaps (on the
>> client side) and cached
>> • you probably know this is known as bitmap caching.
>> • Then the bitmaps are used repeatedly instead of rendering the
>> SWF objects repeatedly.
>> • Can we do Bitmap Caching for all those vector graphics which
>> do not change frequently (from Laszlo, but possibly with specific
>> usage of Actionscript if necessary)
>
> I believe Max (cc-ed) has experimented with this. There may even be
> support in LZX for it.
We do have support for this in drawview. We can experiment with adding
support for vector resources as well. There seemed to be side effects
for things with nested views, for example.
>> 6.
>> Garbage collection: we would like to trigger the Flash garbage
>> collection just to test what is going on (as a test not permanent
>> change). Any way for us to do this?
>
> I am not aware of a programmatic way of doing that. In most browsers,
> if you minimize the window the app is running in the Flash GC will run.
>
> Again, there are probably tools provided by Adobe for these purposes,
> but I have not used them. There are probably more tools in the open
> source Flex compiler, so the swf9 runtime should be easier to measure
> and tune in this respect.
--
Regards,
Max Carlson
OpenLaszlo.org
--
Regards,
Max Carlson
OpenLaszlo.org
