[Mono-list] Two questions about System.Windows.Controls.Image

[Spencer, Matthew]

Hi Paolo

Attached is the example app, I run out of memory pretty quick using
this.

Matt

-----Original Message-----
From: mono-list-bounces at lists.ximian.com
[mailto:mono-list-bounces at lists.ximian.com] On Behalf Of Paolo Molaro
Sent: 22 August 2007 14:31
To: mono-list at lists.ximian.com
Subject: Re: [Mono-list] Two questions about
System.Windows.Controls.Image

On 08/17/07 Spencer, Matthew wrote:
>  Either I am using it incorrectly, or there is a severe memory leak in

> its implementation.  The way I am using it is to create two Image 
> objects, and fade between the two of them, repeatedly loading the next

> image by calling SetSource(..) on the hidden object.  It appears that 
> the memory of previous images is never released.  Is this what is 
> expected, or is there a problem with the current implementation?

Please post a complete sample that can be used to reproduce the issue so
we can debug it.

> My next question is about garbage collection when the bulk of the 
> storage for an object is in native space (as I think it is with the 
> Image class).  I know I have done this before with Java and the 
> garbage collector never kicked in because the runtime was only aware 
> of a small amount of data being consumed by unreferenced objects (a 
> reference to the native data store).  I'm not sure if Mono uses a 
> similar policy on deciding if garbage collection is necessary, but 
> this may cause a problem for Silverlight apps in the future if it
does.

Version 2.0+ of the runtime supports the
GC.AddMemoryPressure()/RemoveMemoryPressure() for this purpouse: call
the first when allocating the unamanged data and the second when
releasing it. We currently do nothing with this, but it's good to have
the stuff in place for when the GC will make its decisions based also on
this.

lupus

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