Re: Setting Font Faces and Sizes

[Torsten Schoenfeld <kaffeetisch gmx de>]

On Sat, 2007-01-06 at 16:22 -0500, muppet wrote:

> > Yeah.  We're using newSVPangoFontDescription_copy in
> > Gtk2::Style::font_desc, so we actually hand out a copy.  I think  
> > that's
> > not necessary.  Proposed patch attached.
>
> Looks okay, but i'm worried about compatibility.  The current code  
> goes back a long, long way.  Aside from renumbering the switch  
> statement in Nov '03, there's a bugfix:

That worried me too.  There might be code out there that relies on
getting a copy.  People might store the object somewhere and then try to
use it after the style has been destroyed which most probably leads to
havoc.

> Copy the font_desc, not &font_desc
> http://gtk2-perl.cvs.sourceforge.net/gtk2-perl/gtk2-perl-xs/Gtk2/xs/ 
> GtkStyle.xs?r1=1.5&r2=1.6
>
> And the use of newSVPangoFontDescription_copy() goes all the way back  
> to version 1.1, imported from the last non-cvs snapshot in April of  
> '03.  The comment, "/* FIXME: is it correct to _copy these */" is  
> intact in that first revision, as well.  :-/

Looks like I changed the color accessors to not use _copy.  I don't know
why I didn't change font_desc as well. :-/

> Not sure.  Not sure how to test it for compatibility, either.  I can  
> come up with arguments either way as to whether it should or  
> shouldn't hand out a copy...

I think handing out the real thing would make more sense since
otherwise, modifications done to the object have no effect on the style.
But the compatibility concerns you raised and the existence of a
workaround (modify_font) seem to be reason enough not to change the
current behavior.

-- 
Bye,
-Torsten