RE: [ft-devel] serious bug introduced 2005-10-29

[Turner, David]

ok, i've done some investigation:

- i can't reproduce the problem on Windows, with either "make setup devel" or 
"jam"
  I'm using gcc 3.2.3

- on Linux, I can't reproduce the problem when compiling with Jam at the moment.
  However, I *can* with "make setup devel". Don't know why just yet. This is
  puzzling...

- disabling the latest optimizations in ftcalc.c doesn't change anything to the
  output (still buggy on Linux with "make setup devel")

- running valgrind reveals some bad things in the bytecode interpreter.
  Everytime FT_UNUSED_EXEC is evaluated, a full structure copy is
  performed  ( *exc = *exc ). this makes Valgrind scream because
  the contents of a memcpy are overlapping... Ah ah ah, never noticed
  this one, which must be a performance killer, by the way...

- no other errors are reported by Valgrind (except some memory leaks
  in the graph library, I should fix these some days, but it's so low priority)

I'm continuing my tests to see what's happening here.

Stay tuned,

- David


> -----Message d'origine-----
> De : address@hidden
> [mailto:address@hidden
> la part de Ismail Donmez
> Envoyé : mardi 15 novembre 2005 13:08
> À : address@hidden
> Objet : Re: [ft-devel] serious bug introduced 2005-10-29
>
>
> On Tuesday 15 November 2005 12:36, Werner LEMBERG wrote:
> > David,
> >
> >
> > a comparison between a FreeType checkout with -D 2005-10-28 and -D
> > 2005-10-29 shows that the latter has introduced a serious bug
> > w.r.t. TTF handling.  Attached two images from the font
> Dustismo.ttf.
> >
> > Perhaps your arithmetic performance improvents are buggy...
> >
> > This might also be the cause for the strange Vera rendering issues.
>
> I am seeing many bad artifacts with Tahoma.ttf from Windows
> installation. I
> was thinking optimization would break Qt but I guess it breaks more.
>
> Regards,
> ismail
>
>
> _______________________________________________
> Freetype-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/freetype-devel
>
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