Re: gtk_widget_create_pango_layout

[Olexiy Avramchenko <olexiy irtech cn ua>]

Claudiu wrote:

> Hello,
>
> I am using gtk_widget_create_pango_layout to create a PangoLayout for 
> using in gdk_draw_layout.
> I would like to know if the memory allocated by 
> gtk_widget_create_pango_layout is automatically freed by GTK, or 
> should I free it ? 
You should free it with g_object_unref().

> I use this in an expose event callback, where I also use gdk_gc_new 
> and gdk_pixmap_new among other functions, I use g_object_unref at the 
> end of the callback function to free the memory allocated by the 
> functions I enumerated above. 
Opps, are you sure that you *have* to allocate/free such resources on 
each expose event call ? You can use widget's default GC by pointer 
'widget->style->*_gc' [1], pixmap can be created once when widget gets 
mapped or when widget size changes...
[1] http://developer.gnome.org/doc/API/2.0/gtk/GtkStyle.html#GtkStyle-struct

> Is there a rule on what should be freed and what not ? 
If you create object you should free it (remove your reference, 
actually). Its safe when some internal library code still uses it - this 
code holds its own reference and object will not be freed until 
reference counter > 0.
   Olexiy