[Lazarus] Tpicture.LoadFromFile leaking memory under linux/gtk2?

[Luca Olivetti]

En/na Luca Olivetti ha escrit:
> I'm not sure it is a bug, so I'm asking here before reporting it as such.
> 
> this code:
> 
> procedure TForm1.Timer1Timer(Sender: TObject);
> begin
>   timer1.enabled:=false;
>   while not Application.Terminated do
>   begin
>     image1.Picture.loadfromfile('test.png');
>     Label1.Tag:=Label1.Tag+1;
>     Label1.Caption:=IntToStr(Label1.Tag);
>     Application.ProcessMessages;
>   end;
> end;
> 
> works perfectly under windows, but under linux/gtk2 the application is 
> using more and more memory (slowly but constantly, until the OOM kills 
> it) both for the application itself and for X.
> Of course heaptrc reports no leak, using cmem doesn't help.
> 
> Before you ask, the application is not an interactive one, and the above 
> construct is to avoid using a thread (which makes memory usage even 
> worse), the real loop is like "read some data from the network, display 
> it, application.processmessages". If I limit myself to update labels, 
> memory usage stays constant, as soon as I try to use images (like the 
> above example) memory usage starts growing.
> 
> This happened both with an old svn revision (22350) with fpc 2.2.4 and 
> with a version updated yesterday (27607) with fpc 2.4.0.


I worked around the problem by caching the images in memory instead of 
loading them every time, but I'd like to know where the above is leaking 
memory.

Bye
-- 
Luca Olivetti
Wetron Automatización S.A. http://www.wetron.es/
Tel. +34 93 5883004 (Ext.133)  Fax +34 93 5883007