[ft-devel] Re: xorg crashes with freetype2-2.1.10

Joe Marcus Clarke marcus at FreeBSD.org
Wed Jul 20 05:12:49 GMT 2005


On Wed, 2005-07-20 at 06:16 +0100, Hin-Tak Leung wrote:
> The ChangeLog entry does mention the specific change explicitly:

Ah.  Still kind of cryptic, though.  _Why_ shouldn't they be used?

> 
> 2005-02-28  David Turner  <david at freetype.org>
> ...
>          * src/sfnt/sfdriver.c (sfnt_interface)
>          [TT_CONFIG_OPTION_EMBEDDED_BITMAPS]: Don't use `tt_find_sbit_image'
>          and `tt_load_sbit_metrics'.
> ...
> 
> So the change is intentional. I just upgraded to stock freetype 2.1.10
> (was using cvs-2004-dec-31), went around a few web pages with mozilla-xft,
> and I don't have crashes. I am using xorg 6.8.2 on linux. How do you
> trigger the crash?

Honestly, I have been able to trigger the crash myself.  It appears to
be triggered by a certain font (or set of fonts).  The Microsoft
webfonts seem to be particularly problematic.

Joe

> 
> Joe Marcus Clarke wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > Hin-Tak Leung wrote:
> > | Found the CVS entry:
> > |
> > |
> > http://savannah.nongnu.org/cgi-bin/viewcvs/freetype/freetype2/src/sfnt/sfdriver.c.diff?r1=1.71&r2=1.72 
> > 
> > 
> > |
> > |
> > |
> > |   * include/freetype/internal/tttypes.h, src/sfnt/ttsbit.c,
> > | src/sfnt/ttsbit0.c,
> > |   src/truetype/ttobjs.c, src/cff/cffobjs.c, src/sfnt/sfobjs.c:
> > | implementing new
> > |   heap-optimized embedded bitmap loader. This one also fixes bug #12107
> > |
> > | checked in by user 'freetype' (David Turner?). they were changed to NULL,
> > | then to zero - there must be a reason?
> > 
> > Yes, there must be a reason, but that commit message doesn't list
> > sfdriver.c explicitly.  That's why I was wondering what the exact reason
> > was for the change, and what new steps should be done to get similar
> > results from FT.
> > 
> > Joe
> > 
> > |
> > | Jeremy Messenger wrote:
> > |
> > |> On Sun, 17 Jul 2005 15:24:40 -0500, Joe Marcus Clarke
> > |> <marcus at FreeBSD.org>  wrote:
> > |>
> > |>> Looks like the freetype module in xorg (and XFree86) makes reference to
> > |>> SFNT_Service->find_sbit_image which is now 0 in FT 2.1.10 (it used 
> > to be
> > |>> initialized to tt_find_sbit_image).  This causes X to die rather
> > |>> abruptly when trying to dereference this symbol:
> > |>>
> > |>> http://people.freebsd.org/~mezz/gdb/gdb-freetype2.txt
> > |>>
> > |>> I assume this was done by design in FT (though I couldn't find a commit
> > |>> message that said spoke about this particular change).  If so, what
> > |>> should X be doing to correctly obtain the glyph sbit?  Thanks!
> > |>
> > |>
> > |>
> > |> I have solved the crash. I have been using it for the thirty minutes
> > |> and  no crash so far. If I do unpatch and it will crash within five
> > |> minutes.  Here's patch to put in freetype2/files. Don't know if patch
> > |> is right, but  at least it's fixed for me.
> > |>
> > |> http://people.freebsd.org/~mezz/patch-src::sfnt::sfdriver.c
> > |>
> > |> I found it by compared freetype2 2.1.9 and 2.1.10, you can check if
> > |> you  want to see for youself. I removed compare of Makefile, configure
> > |> and  other useless stuff.
> > |>
> > |> http://people.freebsd.org/~mezz/freetype2-compare.diff.bz2
> > |>
> > |> It looks like 2.1.10 removed or disabled *find_sbit_image? Search for
> > |> 'find_sbit_image' in freetype2-compare.diff.bz2.
> > |>
> > |> Cheers,
> > |> Mezz
> > |>
> > |>> Joe
> > |>
> > |>
> > |>
> > |>
> > |
> > |
> > | ___________________________________________________________ How much
> > | free photo storage do you get? Store your holiday snaps for FREE with
> > | Yahoo! Photos http://uk.photos.yahoo.com
> > |
> > 
> > 
> > - --
> > Joe Marcus Clarke
> > FreeBSD GNOME Team    ::    gnome at FreeBSD.org
> > FreeNode / #freebsd-gnome
> > http://www.FreeBSD.org/gnome
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> > ts1bAb9rB9D1InM6I8QuhcA=
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> 
> 	
> 	
> 		
> ___________________________________________________________ 
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> 
-- 
Joe Marcus Clarke
FreeBSD GNOME Team      ::      gnome at FreeBSD.org
FreeNode / #freebsd-gnome
http://www.FreeBSD.org/gnome
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