Re: [ft] Regression in rendering of Luxi Mono

[David Turner]

Hello Mike,

wow, the CVS code contains some modifications to the bytecode interpreter
that were done to get rid of very subtle differences between Windows and
FreeType + bytecode intepreter.

It seems you've hit a very weird bug in the "enhanced" interpreter that
I couldn't spot with any other font.

I'll try to see what's causing this in the following days. In the meantime,
you can still comment the line that reads

#define  FIX_BYTECODE

at the start of src/truetype/ttinterp.c, this should disable the "fix"
and revert to the previous behaviour.

Hope this helps,

- David


On Thu, 19 Oct 2006 18:14:03 +0200, "Mike FABIAN" <address@hidden> said:
> In freetype 2.2.1 CVS version from 20061013, "Luxi Mono" is
> rendered completely broken when the autohinter is not used.
> 
> See this screen shot (from ftview):
> 
> http://lisa.goe.net/~mfabian/freetype2-luxi-mono-autohinting-problem/luxi-mono-autohinting-off-ft-2.2.1.20061013.png
> 
> When the autohinter is switched on, the problem disappears,
> see the following screen shot:
> 
> http://lisa.goe.net/~mfabian/freetype2-luxi-mono-autohinting-problem/luxi-mono-autohinting-on-ft-2.2.1.20061013.png
> 
> It is nice that the autohinter improves the rendering, but why is the
> rendering completely broken without the autohinter?
> 
> The problem did not exist in freetype 2.1.10, see the following
> two screen shots:
> 
> http://lisa.goe.net/~mfabian/freetype2-luxi-mono-autohinting-problem/luxi-mono-autohinting-off-ft-2.1.10.png
> http://lisa.goe.net/~mfabian/freetype2-luxi-mono-autohinting-problem/luxi-mono-autohinting-on-ft-2.1.10.png
> 
> In freetype 2.1.10, switching off the autohinter changes the rendering
> results only slighly, there is no such huge difference as with
> freetype 2.2.1.20061013 where the rendering of "Luxi Mono" without the
> autohinter is completely broken.
> 
> By the way, both freetype version used for testing this were compiled
> *with* the byte code interpreter!
> 
> The font is /usr/share/fonts/truetype/luximr.ttf as distributed
> with X.org release 7.1. This font is also available here:
> 
> http://lisa.goe.net/~mfabian/freetype2-luxi-mono-autohinting-problem/luximr.ttf
> 
> -- 
> Mike FABIAN   <address@hidden>   http://www.suse.de/~mfabian
> &#30561;&#30496;&#19981;&#36275;&#12399;&#12356;&#12356;&#20181;&#20107;&#12398;&#25973;&#12384;&#12290;
> 
> 
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- David Turner
- The FreeType Project  (www.freetype.org)